1 /*
2 * MPEG-4 decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #define UNCHECKED_BITSTREAM_READER 1
24
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
28 #include "error_resilience.h"
29 #include "hwaccel.h"
30 #include "idctdsp.h"
31 #include "internal.h"
32 #include "mpegutils.h"
33 #include "mpegvideo.h"
34 #include "mpegvideodata.h"
35 #include "mpeg4video.h"
36 #include "h263.h"
37 #include "profiles.h"
38 #include "thread.h"
39 #include "xvididct.h"
40 #include "unary.h"
41
42 /* The defines below define the number of bits that are read at once for
43 * reading vlc values. Changing these may improve speed and data cache needs
44 * be aware though that decreasing them may need the number of stages that is
45 * passed to get_vlc* to be increased. */
46 #define SPRITE_TRAJ_VLC_BITS 6
47 #define DC_VLC_BITS 9
48 #define MB_TYPE_B_VLC_BITS 4
49 #define STUDIO_INTRA_BITS 9
50
51 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb);
52
53 static VLC dc_lum, dc_chrom;
54 static VLC sprite_trajectory;
55 static VLC mb_type_b_vlc;
56
57 static const int mb_type_b_map[4] = {
58 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
59 MB_TYPE_L0L1 | MB_TYPE_16x16,
60 MB_TYPE_L1 | MB_TYPE_16x16,
61 MB_TYPE_L0 | MB_TYPE_16x16,
62 };
63
64 /**
65 * Predict the ac.
66 * @param n block index (0-3 are luma, 4-5 are chroma)
67 * @param dir the ac prediction direction
68 */
ff_mpeg4_pred_ac(MpegEncContext * s,int16_t * block,int n,int dir)69 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
70 {
71 int i;
72 int16_t *ac_val, *ac_val1;
73 int8_t *const qscale_table = s->current_picture.qscale_table;
74
75 /* find prediction */
76 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
77 ac_val1 = ac_val;
78 if (s->ac_pred) {
79 if (dir == 0) {
80 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
81 /* left prediction */
82 ac_val -= 16;
83
84 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
85 n == 1 || n == 3) {
86 /* same qscale */
87 for (i = 1; i < 8; i++)
88 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
89 } else {
90 /* different qscale, we must rescale */
91 for (i = 1; i < 8; i++)
92 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
93 }
94 } else {
95 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
96 /* top prediction */
97 ac_val -= 16 * s->block_wrap[n];
98
99 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
100 n == 2 || n == 3) {
101 /* same qscale */
102 for (i = 1; i < 8; i++)
103 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
104 } else {
105 /* different qscale, we must rescale */
106 for (i = 1; i < 8; i++)
107 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
108 }
109 }
110 }
111 /* left copy */
112 for (i = 1; i < 8; i++)
113 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
114
115 /* top copy */
116 for (i = 1; i < 8; i++)
117 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
118 }
119
120 /**
121 * check if the next stuff is a resync marker or the end.
122 * @return 0 if not
123 */
mpeg4_is_resync(Mpeg4DecContext * ctx)124 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
125 {
126 MpegEncContext *s = &ctx->m;
127 int bits_count = get_bits_count(&s->gb);
128 int v = show_bits(&s->gb, 16);
129
130 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
131 return 0;
132
133 while (v <= 0xFF) {
134 if (s->pict_type == AV_PICTURE_TYPE_B ||
135 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
136 break;
137 skip_bits(&s->gb, 8 + s->pict_type);
138 bits_count += 8 + s->pict_type;
139 v = show_bits(&s->gb, 16);
140 }
141
142 if (bits_count + 8 >= s->gb.size_in_bits) {
143 v >>= 8;
144 v |= 0x7F >> (7 - (bits_count & 7));
145
146 if (v == 0x7F)
147 return s->mb_num;
148 } else {
149 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
150 int len, mb_num;
151 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
152 GetBitContext gb = s->gb;
153
154 skip_bits(&s->gb, 1);
155 align_get_bits(&s->gb);
156
157 for (len = 0; len < 32; len++)
158 if (get_bits1(&s->gb))
159 break;
160
161 mb_num = get_bits(&s->gb, mb_num_bits);
162 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
163 mb_num= -1;
164
165 s->gb = gb;
166
167 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
168 return mb_num;
169 }
170 }
171 return 0;
172 }
173
mpeg4_decode_sprite_trajectory(Mpeg4DecContext * ctx,GetBitContext * gb)174 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
175 {
176 MpegEncContext *s = &ctx->m;
177 int a = 2 << s->sprite_warping_accuracy;
178 int rho = 3 - s->sprite_warping_accuracy;
179 int r = 16 / a;
180 int alpha = 1;
181 int beta = 0;
182 int w = s->width;
183 int h = s->height;
184 int min_ab, i, w2, h2, w3, h3;
185 int sprite_ref[4][2];
186 int virtual_ref[2][2];
187 int64_t sprite_offset[2][2];
188 int64_t sprite_delta[2][2];
189
190 // only true for rectangle shapes
191 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
192 { 0, s->height }, { s->width, s->height } };
193 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
194
195 if (w <= 0 || h <= 0)
196 return AVERROR_INVALIDDATA;
197
198 /* the decoder was not properly initialized and we cannot continue */
199 if (sprite_trajectory.table == NULL)
200 return AVERROR_INVALIDDATA;
201
202 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
203 int length;
204 int x = 0, y = 0;
205
206 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
207 if (length > 0)
208 x = get_xbits(gb, length);
209
210 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
211 check_marker(s->avctx, gb, "before sprite_trajectory");
212
213 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
214 if (length > 0)
215 y = get_xbits(gb, length);
216
217 check_marker(s->avctx, gb, "after sprite_trajectory");
218 ctx->sprite_traj[i][0] = d[i][0] = x;
219 ctx->sprite_traj[i][1] = d[i][1] = y;
220 }
221 for (; i < 4; i++)
222 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
223
224 while ((1 << alpha) < w)
225 alpha++;
226 while ((1 << beta) < h)
227 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
228 w2 = 1 << alpha;
229 h2 = 1 << beta;
230
231 // Note, the 4th point isn't used for GMC
232 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
233 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
234 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
235 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
236 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
237 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
238 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
239 } else {
240 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
241 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
242 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
243 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
244 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
245 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
246 }
247 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
248 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
249
250 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
251 * because of that...). Perhaps it should be reordered to be more readable.
252 * The idea behind this virtual_ref mess is to be able to use shifts later
253 * per pixel instead of divides so the distance between points is converted
254 * from w&h based to w2&h2 based which are of the 2^x form. */
255 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
256 ROUNDED_DIV(((w - w2) *
257 (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
258 w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
259 virtual_ref[0][1] = 16 * vop_ref[0][1] +
260 ROUNDED_DIV(((w - w2) *
261 (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
262 w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
263 virtual_ref[1][0] = 16 * vop_ref[0][0] +
264 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
265 h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
266 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
267 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
268 h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
269
270 switch (ctx->num_sprite_warping_points) {
271 case 0:
272 sprite_offset[0][0] =
273 sprite_offset[0][1] =
274 sprite_offset[1][0] =
275 sprite_offset[1][1] = 0;
276 sprite_delta[0][0] = a;
277 sprite_delta[0][1] =
278 sprite_delta[1][0] = 0;
279 sprite_delta[1][1] = a;
280 ctx->sprite_shift[0] =
281 ctx->sprite_shift[1] = 0;
282 break;
283 case 1: // GMC only
284 sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
285 sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
286 sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
287 a * (vop_ref[0][0] / 2);
288 sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
289 a * (vop_ref[0][1] / 2);
290 sprite_delta[0][0] = a;
291 sprite_delta[0][1] =
292 sprite_delta[1][0] = 0;
293 sprite_delta[1][1] = a;
294 ctx->sprite_shift[0] =
295 ctx->sprite_shift[1] = 0;
296 break;
297 case 2:
298 sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
299 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
300 ((int64_t) -vop_ref[0][0]) +
301 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
302 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
303 sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
304 ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
305 ((int64_t) -vop_ref[0][0]) +
306 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
307 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
308 sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
309 ((int64_t)-2 * vop_ref[0][0] + 1) +
310 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
311 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
312 (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
313 sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
314 ((int64_t)-2 * vop_ref[0][0] + 1) +
315 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
316 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
317 (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
318 sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
319 sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
320 sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
321 sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
322
323 ctx->sprite_shift[0] = alpha + rho;
324 ctx->sprite_shift[1] = alpha + rho + 2;
325 break;
326 case 3:
327 min_ab = FFMIN(alpha, beta);
328 w3 = w2 >> min_ab;
329 h3 = h2 >> min_ab;
330 sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
331 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
332 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
333 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
334 sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
335 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
336 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
337 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
338 sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
339 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
340 (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
341 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
342 sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
343 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
344 (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
345 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
346 sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
347 sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
348 sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
349 sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
350
351 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
352 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
353 break;
354 }
355 /* try to simplify the situation */
356 if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
357 sprite_delta[0][1] == 0 &&
358 sprite_delta[1][0] == 0 &&
359 sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
360 sprite_offset[0][0] >>= ctx->sprite_shift[0];
361 sprite_offset[0][1] >>= ctx->sprite_shift[0];
362 sprite_offset[1][0] >>= ctx->sprite_shift[1];
363 sprite_offset[1][1] >>= ctx->sprite_shift[1];
364 sprite_delta[0][0] = a;
365 sprite_delta[0][1] = 0;
366 sprite_delta[1][0] = 0;
367 sprite_delta[1][1] = a;
368 ctx->sprite_shift[0] = 0;
369 ctx->sprite_shift[1] = 0;
370 s->real_sprite_warping_points = 1;
371 } else {
372 int shift_y = 16 - ctx->sprite_shift[0];
373 int shift_c = 16 - ctx->sprite_shift[1];
374
375 for (i = 0; i < 2; i++) {
376 if (shift_c < 0 || shift_y < 0 ||
377 FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
378 FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
379 FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
380 FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
381 ) {
382 avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
383 goto overflow;
384 }
385 }
386
387 for (i = 0; i < 2; i++) {
388 sprite_offset[0][i] *= 1 << shift_y;
389 sprite_offset[1][i] *= 1 << shift_c;
390 sprite_delta[0][i] *= 1 << shift_y;
391 sprite_delta[1][i] *= 1 << shift_y;
392 ctx->sprite_shift[i] = 16;
393
394 }
395 for (i = 0; i < 2; i++) {
396 int64_t sd[2] = {
397 sprite_delta[i][0] - a * (1LL<<16),
398 sprite_delta[i][1] - a * (1LL<<16)
399 };
400
401 if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
402 llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
403 llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
404 llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
405 llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
406 llabs(sd[0]) >= INT_MAX ||
407 llabs(sd[1]) >= INT_MAX ||
408 llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
409 llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
410 llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
411 ) {
412 avpriv_request_sample(s->avctx, "Overflow on sprite points");
413 goto overflow;
414 }
415 }
416 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
417 }
418
419 for (i = 0; i < 4; i++) {
420 s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
421 s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
422 }
423
424 return 0;
425 overflow:
426 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
427 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
428 return AVERROR_PATCHWELCOME;
429 }
430
decode_new_pred(Mpeg4DecContext * ctx,GetBitContext * gb)431 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
432 MpegEncContext *s = &ctx->m;
433 int len = FFMIN(ctx->time_increment_bits + 3, 15);
434
435 get_bits(gb, len);
436 if (get_bits1(gb))
437 get_bits(gb, len);
438 check_marker(s->avctx, gb, "after new_pred");
439
440 return 0;
441 }
442
443 /**
444 * Decode the next video packet.
445 * @return <0 if something went wrong
446 */
ff_mpeg4_decode_video_packet_header(Mpeg4DecContext * ctx)447 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
448 {
449 MpegEncContext *s = &ctx->m;
450
451 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
452 int header_extension = 0, mb_num, len;
453
454 /* is there enough space left for a video packet + header */
455 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
456 return AVERROR_INVALIDDATA;
457
458 for (len = 0; len < 32; len++)
459 if (get_bits1(&s->gb))
460 break;
461
462 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
463 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
464 return AVERROR_INVALIDDATA;
465 }
466
467 if (ctx->shape != RECT_SHAPE) {
468 header_extension = get_bits1(&s->gb);
469 // FIXME more stuff here
470 }
471
472 mb_num = get_bits(&s->gb, mb_num_bits);
473 if (mb_num >= s->mb_num || !mb_num) {
474 av_log(s->avctx, AV_LOG_ERROR,
475 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
476 return AVERROR_INVALIDDATA;
477 }
478
479 s->mb_x = mb_num % s->mb_width;
480 s->mb_y = mb_num / s->mb_width;
481
482 if (ctx->shape != BIN_ONLY_SHAPE) {
483 int qscale = get_bits(&s->gb, s->quant_precision);
484 if (qscale)
485 s->chroma_qscale = s->qscale = qscale;
486 }
487
488 if (ctx->shape == RECT_SHAPE)
489 header_extension = get_bits1(&s->gb);
490
491 if (header_extension) {
492 int time_incr = 0;
493
494 while (get_bits1(&s->gb) != 0)
495 time_incr++;
496
497 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
498 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
499 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
500
501 skip_bits(&s->gb, 2); /* vop coding type */
502 // FIXME not rect stuff here
503
504 if (ctx->shape != BIN_ONLY_SHAPE) {
505 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
506 // FIXME don't just ignore everything
507 if (s->pict_type == AV_PICTURE_TYPE_S &&
508 ctx->vol_sprite_usage == GMC_SPRITE) {
509 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
510 return AVERROR_INVALIDDATA;
511 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
512 }
513
514 // FIXME reduced res stuff here
515
516 if (s->pict_type != AV_PICTURE_TYPE_I) {
517 int f_code = get_bits(&s->gb, 3); /* fcode_for */
518 if (f_code == 0)
519 av_log(s->avctx, AV_LOG_ERROR,
520 "Error, video packet header damaged (f_code=0)\n");
521 }
522 if (s->pict_type == AV_PICTURE_TYPE_B) {
523 int b_code = get_bits(&s->gb, 3);
524 if (b_code == 0)
525 av_log(s->avctx, AV_LOG_ERROR,
526 "Error, video packet header damaged (b_code=0)\n");
527 }
528 }
529 }
530 if (ctx->new_pred)
531 decode_new_pred(ctx, &s->gb);
532
533 return 0;
534 }
535
reset_studio_dc_predictors(MpegEncContext * s)536 static void reset_studio_dc_predictors(MpegEncContext *s)
537 {
538 /* Reset DC Predictors */
539 s->last_dc[0] =
540 s->last_dc[1] =
541 s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
542 }
543
544 /**
545 * Decode the next video packet.
546 * @return <0 if something went wrong
547 */
ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext * ctx)548 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
549 {
550 MpegEncContext *s = &ctx->m;
551 GetBitContext *gb = &s->gb;
552 unsigned vlc_len;
553 uint16_t mb_num;
554
555 if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_START_CODE) {
556 vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
557 mb_num = get_bits(gb, vlc_len);
558
559 if (mb_num >= s->mb_num)
560 return AVERROR_INVALIDDATA;
561
562 s->mb_x = mb_num % s->mb_width;
563 s->mb_y = mb_num / s->mb_width;
564
565 if (ctx->shape != BIN_ONLY_SHAPE)
566 s->qscale = mpeg_get_qscale(s);
567
568 if (get_bits1(gb)) { /* slice_extension_flag */
569 skip_bits1(gb); /* intra_slice */
570 skip_bits1(gb); /* slice_VOP_id_enable */
571 skip_bits(gb, 6); /* slice_VOP_id */
572 while (get_bits1(gb)) /* extra_bit_slice */
573 skip_bits(gb, 8); /* extra_information_slice */
574 }
575
576 reset_studio_dc_predictors(s);
577 }
578 else {
579 return AVERROR_INVALIDDATA;
580 }
581
582 return 0;
583 }
584
585 /**
586 * Get the average motion vector for a GMC MB.
587 * @param n either 0 for the x component or 1 for y
588 * @return the average MV for a GMC MB
589 */
get_amv(Mpeg4DecContext * ctx,int n)590 static inline int get_amv(Mpeg4DecContext *ctx, int n)
591 {
592 MpegEncContext *s = &ctx->m;
593 int x, y, mb_v, sum, dx, dy, shift;
594 int len = 1 << (s->f_code + 4);
595 const int a = s->sprite_warping_accuracy;
596
597 if (s->workaround_bugs & FF_BUG_AMV)
598 len >>= s->quarter_sample;
599
600 if (s->real_sprite_warping_points == 1) {
601 if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
602 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
603 else
604 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
605 } else {
606 dx = s->sprite_delta[n][0];
607 dy = s->sprite_delta[n][1];
608 shift = ctx->sprite_shift[0];
609 if (n)
610 dy -= 1 << (shift + a + 1);
611 else
612 dx -= 1 << (shift + a + 1);
613 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
614
615 sum = 0;
616 for (y = 0; y < 16; y++) {
617 int v;
618
619 v = mb_v + dy * y;
620 // FIXME optimize
621 for (x = 0; x < 16; x++) {
622 sum += v >> shift;
623 v += dx;
624 }
625 }
626 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
627 }
628
629 if (sum < -len)
630 sum = -len;
631 else if (sum >= len)
632 sum = len - 1;
633
634 return sum;
635 }
636
637 /**
638 * Decode the dc value.
639 * @param n block index (0-3 are luma, 4-5 are chroma)
640 * @param dir_ptr the prediction direction will be stored here
641 * @return the quantized dc
642 */
mpeg4_decode_dc(MpegEncContext * s,int n,int * dir_ptr)643 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
644 {
645 int level, code;
646
647 if (n < 4)
648 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
649 else
650 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
651
652 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
653 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
654 return AVERROR_INVALIDDATA;
655 }
656
657 if (code == 0) {
658 level = 0;
659 } else {
660 if (IS_3IV1) {
661 if (code == 1)
662 level = 2 * get_bits1(&s->gb) - 1;
663 else {
664 if (get_bits1(&s->gb))
665 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
666 else
667 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
668 }
669 } else {
670 level = get_xbits(&s->gb, code);
671 }
672
673 if (code > 8) {
674 if (get_bits1(&s->gb) == 0) { /* marker */
675 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
676 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
677 return AVERROR_INVALIDDATA;
678 }
679 }
680 }
681 }
682
683 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
684 }
685
686 /**
687 * Decode first partition.
688 * @return number of MBs decoded or <0 if an error occurred
689 */
mpeg4_decode_partition_a(Mpeg4DecContext * ctx)690 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
691 {
692 MpegEncContext *s = &ctx->m;
693 int mb_num = 0;
694 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
695
696 /* decode first partition */
697 s->first_slice_line = 1;
698 for (; s->mb_y < s->mb_height; s->mb_y++) {
699 ff_init_block_index(s);
700 for (; s->mb_x < s->mb_width; s->mb_x++) {
701 const int xy = s->mb_x + s->mb_y * s->mb_stride;
702 int cbpc;
703 int dir = 0;
704
705 mb_num++;
706 ff_update_block_index(s);
707 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
708 s->first_slice_line = 0;
709
710 if (s->pict_type == AV_PICTURE_TYPE_I) {
711 int i;
712
713 do {
714 if (show_bits_long(&s->gb, 19) == DC_MARKER)
715 return mb_num - 1;
716
717 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
718 if (cbpc < 0) {
719 av_log(s->avctx, AV_LOG_ERROR,
720 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
721 return AVERROR_INVALIDDATA;
722 }
723 } while (cbpc == 8);
724
725 s->cbp_table[xy] = cbpc & 3;
726 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
727 s->mb_intra = 1;
728
729 if (cbpc & 4)
730 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
731
732 s->current_picture.qscale_table[xy] = s->qscale;
733
734 s->mbintra_table[xy] = 1;
735 for (i = 0; i < 6; i++) {
736 int dc_pred_dir;
737 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
738 if (dc < 0) {
739 av_log(s->avctx, AV_LOG_ERROR,
740 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
741 return dc;
742 }
743 dir <<= 1;
744 if (dc_pred_dir)
745 dir |= 1;
746 }
747 s->pred_dir_table[xy] = dir;
748 } else { /* P/S_TYPE */
749 int mx, my, pred_x, pred_y, bits;
750 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
751 const int stride = s->b8_stride * 2;
752
753 try_again:
754 bits = show_bits(&s->gb, 17);
755 if (bits == MOTION_MARKER)
756 return mb_num - 1;
757
758 skip_bits1(&s->gb);
759 if (bits & 0x10000) {
760 /* skip mb */
761 if (s->pict_type == AV_PICTURE_TYPE_S &&
762 ctx->vol_sprite_usage == GMC_SPRITE) {
763 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
764 MB_TYPE_16x16 |
765 MB_TYPE_GMC |
766 MB_TYPE_L0;
767 mx = get_amv(ctx, 0);
768 my = get_amv(ctx, 1);
769 } else {
770 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
771 MB_TYPE_16x16 |
772 MB_TYPE_L0;
773 mx = my = 0;
774 }
775 mot_val[0] =
776 mot_val[2] =
777 mot_val[0 + stride] =
778 mot_val[2 + stride] = mx;
779 mot_val[1] =
780 mot_val[3] =
781 mot_val[1 + stride] =
782 mot_val[3 + stride] = my;
783
784 if (s->mbintra_table[xy])
785 ff_clean_intra_table_entries(s);
786 continue;
787 }
788
789 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
790 if (cbpc < 0) {
791 av_log(s->avctx, AV_LOG_ERROR,
792 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
793 return AVERROR_INVALIDDATA;
794 }
795 if (cbpc == 20)
796 goto try_again;
797
798 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
799
800 s->mb_intra = ((cbpc & 4) != 0);
801
802 if (s->mb_intra) {
803 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
804 s->mbintra_table[xy] = 1;
805 mot_val[0] =
806 mot_val[2] =
807 mot_val[0 + stride] =
808 mot_val[2 + stride] = 0;
809 mot_val[1] =
810 mot_val[3] =
811 mot_val[1 + stride] =
812 mot_val[3 + stride] = 0;
813 } else {
814 if (s->mbintra_table[xy])
815 ff_clean_intra_table_entries(s);
816
817 if (s->pict_type == AV_PICTURE_TYPE_S &&
818 ctx->vol_sprite_usage == GMC_SPRITE &&
819 (cbpc & 16) == 0)
820 s->mcsel = get_bits1(&s->gb);
821 else
822 s->mcsel = 0;
823
824 if ((cbpc & 16) == 0) {
825 /* 16x16 motion prediction */
826
827 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
828 if (!s->mcsel) {
829 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
830 if (mx >= 0xffff)
831 return AVERROR_INVALIDDATA;
832
833 my = ff_h263_decode_motion(s, pred_y, s->f_code);
834 if (my >= 0xffff)
835 return AVERROR_INVALIDDATA;
836 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
837 MB_TYPE_L0;
838 } else {
839 mx = get_amv(ctx, 0);
840 my = get_amv(ctx, 1);
841 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
842 MB_TYPE_GMC |
843 MB_TYPE_L0;
844 }
845
846 mot_val[0] =
847 mot_val[2] =
848 mot_val[0 + stride] =
849 mot_val[2 + stride] = mx;
850 mot_val[1] =
851 mot_val[3] =
852 mot_val[1 + stride] =
853 mot_val[3 + stride] = my;
854 } else {
855 int i;
856 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
857 MB_TYPE_L0;
858 for (i = 0; i < 4; i++) {
859 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
860 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
861 if (mx >= 0xffff)
862 return AVERROR_INVALIDDATA;
863
864 my = ff_h263_decode_motion(s, pred_y, s->f_code);
865 if (my >= 0xffff)
866 return AVERROR_INVALIDDATA;
867 mot_val[0] = mx;
868 mot_val[1] = my;
869 }
870 }
871 }
872 }
873 }
874 s->mb_x = 0;
875 }
876
877 return mb_num;
878 }
879
880 /**
881 * decode second partition.
882 * @return <0 if an error occurred
883 */
mpeg4_decode_partition_b(MpegEncContext * s,int mb_count)884 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
885 {
886 int mb_num = 0;
887 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
888
889 s->mb_x = s->resync_mb_x;
890 s->first_slice_line = 1;
891 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
892 ff_init_block_index(s);
893 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
894 const int xy = s->mb_x + s->mb_y * s->mb_stride;
895
896 mb_num++;
897 ff_update_block_index(s);
898 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
899 s->first_slice_line = 0;
900
901 if (s->pict_type == AV_PICTURE_TYPE_I) {
902 int ac_pred = get_bits1(&s->gb);
903 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
904 if (cbpy < 0) {
905 av_log(s->avctx, AV_LOG_ERROR,
906 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
907 return AVERROR_INVALIDDATA;
908 }
909
910 s->cbp_table[xy] |= cbpy << 2;
911 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
912 } else { /* P || S_TYPE */
913 if (IS_INTRA(s->current_picture.mb_type[xy])) {
914 int i;
915 int dir = 0;
916 int ac_pred = get_bits1(&s->gb);
917 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
918
919 if (cbpy < 0) {
920 av_log(s->avctx, AV_LOG_ERROR,
921 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
922 return AVERROR_INVALIDDATA;
923 }
924
925 if (s->cbp_table[xy] & 8)
926 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
927 s->current_picture.qscale_table[xy] = s->qscale;
928
929 for (i = 0; i < 6; i++) {
930 int dc_pred_dir;
931 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
932 if (dc < 0) {
933 av_log(s->avctx, AV_LOG_ERROR,
934 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
935 return dc;
936 }
937 dir <<= 1;
938 if (dc_pred_dir)
939 dir |= 1;
940 }
941 s->cbp_table[xy] &= 3; // remove dquant
942 s->cbp_table[xy] |= cbpy << 2;
943 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
944 s->pred_dir_table[xy] = dir;
945 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
946 s->current_picture.qscale_table[xy] = s->qscale;
947 s->cbp_table[xy] = 0;
948 } else {
949 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
950
951 if (cbpy < 0) {
952 av_log(s->avctx, AV_LOG_ERROR,
953 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
954 return AVERROR_INVALIDDATA;
955 }
956
957 if (s->cbp_table[xy] & 8)
958 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
959 s->current_picture.qscale_table[xy] = s->qscale;
960
961 s->cbp_table[xy] &= 3; // remove dquant
962 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
963 }
964 }
965 }
966 if (mb_num >= mb_count)
967 return 0;
968 s->mb_x = 0;
969 }
970 return 0;
971 }
972
973 /**
974 * Decode the first and second partition.
975 * @return <0 if error (and sets error type in the error_status_table)
976 */
ff_mpeg4_decode_partitions(Mpeg4DecContext * ctx)977 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
978 {
979 MpegEncContext *s = &ctx->m;
980 int mb_num;
981 int ret;
982 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
983 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
984
985 mb_num = mpeg4_decode_partition_a(ctx);
986 if (mb_num <= 0) {
987 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
988 s->mb_x, s->mb_y, part_a_error);
989 return mb_num ? mb_num : AVERROR_INVALIDDATA;
990 }
991
992 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
993 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
994 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
995 s->mb_x, s->mb_y, part_a_error);
996 return AVERROR_INVALIDDATA;
997 }
998
999 s->mb_num_left = mb_num;
1000
1001 if (s->pict_type == AV_PICTURE_TYPE_I) {
1002 while (show_bits(&s->gb, 9) == 1)
1003 skip_bits(&s->gb, 9);
1004 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
1005 av_log(s->avctx, AV_LOG_ERROR,
1006 "marker missing after first I partition at %d %d\n",
1007 s->mb_x, s->mb_y);
1008 return AVERROR_INVALIDDATA;
1009 }
1010 } else {
1011 while (show_bits(&s->gb, 10) == 1)
1012 skip_bits(&s->gb, 10);
1013 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
1014 av_log(s->avctx, AV_LOG_ERROR,
1015 "marker missing after first P partition at %d %d\n",
1016 s->mb_x, s->mb_y);
1017 return AVERROR_INVALIDDATA;
1018 }
1019 }
1020 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1021 s->mb_x - 1, s->mb_y, part_a_end);
1022
1023 ret = mpeg4_decode_partition_b(s, mb_num);
1024 if (ret < 0) {
1025 if (s->pict_type == AV_PICTURE_TYPE_P)
1026 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1027 s->mb_x, s->mb_y, ER_DC_ERROR);
1028 return ret;
1029 } else {
1030 if (s->pict_type == AV_PICTURE_TYPE_P)
1031 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1032 s->mb_x - 1, s->mb_y, ER_DC_END);
1033 }
1034
1035 return 0;
1036 }
1037
1038 /**
1039 * Decode a block.
1040 * @return <0 if an error occurred
1041 */
mpeg4_decode_block(Mpeg4DecContext * ctx,int16_t * block,int n,int coded,int intra,int rvlc)1042 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1043 int n, int coded, int intra, int rvlc)
1044 {
1045 MpegEncContext *s = &ctx->m;
1046 int level, i, last, run, qmul, qadd;
1047 int av_uninit(dc_pred_dir);
1048 RLTable *rl;
1049 RL_VLC_ELEM *rl_vlc;
1050 const uint8_t *scan_table;
1051
1052 // Note intra & rvlc should be optimized away if this is inlined
1053
1054 if (intra) {
1055 if (ctx->use_intra_dc_vlc) {
1056 /* DC coef */
1057 if (s->partitioned_frame) {
1058 level = s->dc_val[0][s->block_index[n]];
1059 if (n < 4)
1060 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1061 else
1062 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1063 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1064 } else {
1065 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1066 if (level < 0)
1067 return level;
1068 }
1069 block[0] = level;
1070 i = 0;
1071 } else {
1072 i = -1;
1073 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1074 }
1075 if (!coded)
1076 goto not_coded;
1077
1078 if (rvlc) {
1079 rl = &ff_rvlc_rl_intra;
1080 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1081 } else {
1082 rl = &ff_mpeg4_rl_intra;
1083 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1084 }
1085 if (s->ac_pred) {
1086 if (dc_pred_dir == 0)
1087 scan_table = s->intra_v_scantable.permutated; /* left */
1088 else
1089 scan_table = s->intra_h_scantable.permutated; /* top */
1090 } else {
1091 scan_table = s->intra_scantable.permutated;
1092 }
1093 qmul = 1;
1094 qadd = 0;
1095 } else {
1096 i = -1;
1097 if (!coded) {
1098 s->block_last_index[n] = i;
1099 return 0;
1100 }
1101 if (rvlc)
1102 rl = &ff_rvlc_rl_inter;
1103 else
1104 rl = &ff_h263_rl_inter;
1105
1106 scan_table = s->intra_scantable.permutated;
1107
1108 if (s->mpeg_quant) {
1109 qmul = 1;
1110 qadd = 0;
1111 if (rvlc)
1112 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1113 else
1114 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1115 } else {
1116 qmul = s->qscale << 1;
1117 qadd = (s->qscale - 1) | 1;
1118 if (rvlc)
1119 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1120 else
1121 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1122 }
1123 }
1124 {
1125 OPEN_READER(re, &s->gb);
1126 for (;;) {
1127 UPDATE_CACHE(re, &s->gb);
1128 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1129 if (level == 0) {
1130 /* escape */
1131 if (rvlc) {
1132 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1133 av_log(s->avctx, AV_LOG_ERROR,
1134 "1. marker bit missing in rvlc esc\n");
1135 return AVERROR_INVALIDDATA;
1136 }
1137 SKIP_CACHE(re, &s->gb, 1);
1138
1139 last = SHOW_UBITS(re, &s->gb, 1);
1140 SKIP_CACHE(re, &s->gb, 1);
1141 run = SHOW_UBITS(re, &s->gb, 6);
1142 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1143 UPDATE_CACHE(re, &s->gb);
1144
1145 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1146 av_log(s->avctx, AV_LOG_ERROR,
1147 "2. marker bit missing in rvlc esc\n");
1148 return AVERROR_INVALIDDATA;
1149 }
1150 SKIP_CACHE(re, &s->gb, 1);
1151
1152 level = SHOW_UBITS(re, &s->gb, 11);
1153 SKIP_CACHE(re, &s->gb, 11);
1154
1155 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1156 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1157 return AVERROR_INVALIDDATA;
1158 }
1159 SKIP_CACHE(re, &s->gb, 5);
1160
1161 level = level * qmul + qadd;
1162 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1163 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1164
1165 i += run + 1;
1166 if (last)
1167 i += 192;
1168 } else {
1169 int cache;
1170 cache = GET_CACHE(re, &s->gb);
1171
1172 if (IS_3IV1)
1173 cache ^= 0xC0000000;
1174
1175 if (cache & 0x80000000) {
1176 if (cache & 0x40000000) {
1177 /* third escape */
1178 SKIP_CACHE(re, &s->gb, 2);
1179 last = SHOW_UBITS(re, &s->gb, 1);
1180 SKIP_CACHE(re, &s->gb, 1);
1181 run = SHOW_UBITS(re, &s->gb, 6);
1182 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1183 UPDATE_CACHE(re, &s->gb);
1184
1185 if (IS_3IV1) {
1186 level = SHOW_SBITS(re, &s->gb, 12);
1187 LAST_SKIP_BITS(re, &s->gb, 12);
1188 } else {
1189 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1190 av_log(s->avctx, AV_LOG_ERROR,
1191 "1. marker bit missing in 3. esc\n");
1192 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1193 return AVERROR_INVALIDDATA;
1194 }
1195 SKIP_CACHE(re, &s->gb, 1);
1196
1197 level = SHOW_SBITS(re, &s->gb, 12);
1198 SKIP_CACHE(re, &s->gb, 12);
1199
1200 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1201 av_log(s->avctx, AV_LOG_ERROR,
1202 "2. marker bit missing in 3. esc\n");
1203 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1204 return AVERROR_INVALIDDATA;
1205 }
1206
1207 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1208 }
1209
1210 #if 0
1211 if (s->error_recognition >= FF_ER_COMPLIANT) {
1212 const int abs_level= FFABS(level);
1213 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1214 const int run1= run - rl->max_run[last][abs_level] - 1;
1215 if (abs_level <= rl->max_level[last][run]) {
1216 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1217 return AVERROR_INVALIDDATA;
1218 }
1219 if (s->error_recognition > FF_ER_COMPLIANT) {
1220 if (abs_level <= rl->max_level[last][run]*2) {
1221 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1222 return AVERROR_INVALIDDATA;
1223 }
1224 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1225 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1226 return AVERROR_INVALIDDATA;
1227 }
1228 }
1229 }
1230 }
1231 #endif
1232 if (level > 0)
1233 level = level * qmul + qadd;
1234 else
1235 level = level * qmul - qadd;
1236
1237 if ((unsigned)(level + 2048) > 4095) {
1238 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1239 if (level > 2560 || level < -2560) {
1240 av_log(s->avctx, AV_LOG_ERROR,
1241 "|level| overflow in 3. esc, qp=%d\n",
1242 s->qscale);
1243 return AVERROR_INVALIDDATA;
1244 }
1245 }
1246 level = level < 0 ? -2048 : 2047;
1247 }
1248
1249 i += run + 1;
1250 if (last)
1251 i += 192;
1252 } else {
1253 /* second escape */
1254 SKIP_BITS(re, &s->gb, 2);
1255 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1256 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1257 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1258 LAST_SKIP_BITS(re, &s->gb, 1);
1259 }
1260 } else {
1261 /* first escape */
1262 SKIP_BITS(re, &s->gb, 1);
1263 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1264 i += run;
1265 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1266 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1267 LAST_SKIP_BITS(re, &s->gb, 1);
1268 }
1269 }
1270 } else {
1271 i += run;
1272 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1273 LAST_SKIP_BITS(re, &s->gb, 1);
1274 }
1275 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1276 if (i > 62) {
1277 i -= 192;
1278 if (i & (~63)) {
1279 av_log(s->avctx, AV_LOG_ERROR,
1280 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1281 return AVERROR_INVALIDDATA;
1282 }
1283
1284 block[scan_table[i]] = level;
1285 break;
1286 }
1287
1288 block[scan_table[i]] = level;
1289 }
1290 CLOSE_READER(re, &s->gb);
1291 }
1292
1293 not_coded:
1294 if (intra) {
1295 if (!ctx->use_intra_dc_vlc) {
1296 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1297
1298 i -= i >> 31; // if (i == -1) i = 0;
1299 }
1300
1301 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1302 if (s->ac_pred)
1303 i = 63; // FIXME not optimal
1304 }
1305 s->block_last_index[n] = i;
1306 return 0;
1307 }
1308
1309 /**
1310 * decode partition C of one MB.
1311 * @return <0 if an error occurred
1312 */
mpeg4_decode_partitioned_mb(MpegEncContext * s,int16_t block[6][64])1313 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1314 {
1315 Mpeg4DecContext *ctx = s->avctx->priv_data;
1316 int cbp, mb_type;
1317 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1318
1319 av_assert2(s == (void*)ctx);
1320
1321 mb_type = s->current_picture.mb_type[xy];
1322 cbp = s->cbp_table[xy];
1323
1324 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1325
1326 if (s->current_picture.qscale_table[xy] != s->qscale)
1327 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1328
1329 if (s->pict_type == AV_PICTURE_TYPE_P ||
1330 s->pict_type == AV_PICTURE_TYPE_S) {
1331 int i;
1332 for (i = 0; i < 4; i++) {
1333 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1334 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1335 }
1336 s->mb_intra = IS_INTRA(mb_type);
1337
1338 if (IS_SKIP(mb_type)) {
1339 /* skip mb */
1340 for (i = 0; i < 6; i++)
1341 s->block_last_index[i] = -1;
1342 s->mv_dir = MV_DIR_FORWARD;
1343 s->mv_type = MV_TYPE_16X16;
1344 if (s->pict_type == AV_PICTURE_TYPE_S
1345 && ctx->vol_sprite_usage == GMC_SPRITE) {
1346 s->mcsel = 1;
1347 s->mb_skipped = 0;
1348 } else {
1349 s->mcsel = 0;
1350 s->mb_skipped = 1;
1351 }
1352 } else if (s->mb_intra) {
1353 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1354 } else if (!s->mb_intra) {
1355 // s->mcsel = 0; // FIXME do we need to init that?
1356
1357 s->mv_dir = MV_DIR_FORWARD;
1358 if (IS_8X8(mb_type)) {
1359 s->mv_type = MV_TYPE_8X8;
1360 } else {
1361 s->mv_type = MV_TYPE_16X16;
1362 }
1363 }
1364 } else { /* I-Frame */
1365 s->mb_intra = 1;
1366 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1367 }
1368
1369 if (!IS_SKIP(mb_type)) {
1370 int i;
1371 s->bdsp.clear_blocks(s->block[0]);
1372 /* decode each block */
1373 for (i = 0; i < 6; i++) {
1374 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1375 av_log(s->avctx, AV_LOG_ERROR,
1376 "texture corrupted at %d %d %d\n",
1377 s->mb_x, s->mb_y, s->mb_intra);
1378 return AVERROR_INVALIDDATA;
1379 }
1380 cbp += cbp;
1381 }
1382 }
1383
1384 /* per-MB end of slice check */
1385 if (--s->mb_num_left <= 0) {
1386 if (mpeg4_is_resync(ctx))
1387 return SLICE_END;
1388 else
1389 return SLICE_NOEND;
1390 } else {
1391 if (mpeg4_is_resync(ctx)) {
1392 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1393 if (s->cbp_table[xy + delta])
1394 return SLICE_END;
1395 }
1396 return SLICE_OK;
1397 }
1398 }
1399
mpeg4_decode_mb(MpegEncContext * s,int16_t block[6][64])1400 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1401 {
1402 Mpeg4DecContext *ctx = s->avctx->priv_data;
1403 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1404 int16_t *mot_val;
1405 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1406 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1407
1408 av_assert2(s == (void*)ctx);
1409 av_assert2(s->h263_pred);
1410
1411 if (s->pict_type == AV_PICTURE_TYPE_P ||
1412 s->pict_type == AV_PICTURE_TYPE_S) {
1413 do {
1414 if (get_bits1(&s->gb)) {
1415 /* skip mb */
1416 s->mb_intra = 0;
1417 for (i = 0; i < 6; i++)
1418 s->block_last_index[i] = -1;
1419 s->mv_dir = MV_DIR_FORWARD;
1420 s->mv_type = MV_TYPE_16X16;
1421 if (s->pict_type == AV_PICTURE_TYPE_S &&
1422 ctx->vol_sprite_usage == GMC_SPRITE) {
1423 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1424 MB_TYPE_GMC |
1425 MB_TYPE_16x16 |
1426 MB_TYPE_L0;
1427 s->mcsel = 1;
1428 s->mv[0][0][0] = get_amv(ctx, 0);
1429 s->mv[0][0][1] = get_amv(ctx, 1);
1430 s->mb_skipped = 0;
1431 } else {
1432 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1433 MB_TYPE_16x16 |
1434 MB_TYPE_L0;
1435 s->mcsel = 0;
1436 s->mv[0][0][0] = 0;
1437 s->mv[0][0][1] = 0;
1438 s->mb_skipped = 1;
1439 }
1440 goto end;
1441 }
1442 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1443 if (cbpc < 0) {
1444 av_log(s->avctx, AV_LOG_ERROR,
1445 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1446 return AVERROR_INVALIDDATA;
1447 }
1448 } while (cbpc == 20);
1449
1450 s->bdsp.clear_blocks(s->block[0]);
1451 dquant = cbpc & 8;
1452 s->mb_intra = ((cbpc & 4) != 0);
1453 if (s->mb_intra)
1454 goto intra;
1455
1456 if (s->pict_type == AV_PICTURE_TYPE_S &&
1457 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1458 s->mcsel = get_bits1(&s->gb);
1459 else
1460 s->mcsel = 0;
1461 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1462 if (cbpy < 0) {
1463 av_log(s->avctx, AV_LOG_ERROR,
1464 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1465 return AVERROR_INVALIDDATA;
1466 }
1467
1468 cbp = (cbpc & 3) | (cbpy << 2);
1469 if (dquant)
1470 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1471 if ((!s->progressive_sequence) &&
1472 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1473 s->interlaced_dct = get_bits1(&s->gb);
1474
1475 s->mv_dir = MV_DIR_FORWARD;
1476 if ((cbpc & 16) == 0) {
1477 if (s->mcsel) {
1478 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1479 MB_TYPE_16x16 |
1480 MB_TYPE_L0;
1481 /* 16x16 global motion prediction */
1482 s->mv_type = MV_TYPE_16X16;
1483 mx = get_amv(ctx, 0);
1484 my = get_amv(ctx, 1);
1485 s->mv[0][0][0] = mx;
1486 s->mv[0][0][1] = my;
1487 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1488 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1489 MB_TYPE_L0 |
1490 MB_TYPE_INTERLACED;
1491 /* 16x8 field motion prediction */
1492 s->mv_type = MV_TYPE_FIELD;
1493
1494 s->field_select[0][0] = get_bits1(&s->gb);
1495 s->field_select[0][1] = get_bits1(&s->gb);
1496
1497 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1498
1499 for (i = 0; i < 2; i++) {
1500 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1501 if (mx >= 0xffff)
1502 return AVERROR_INVALIDDATA;
1503
1504 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1505 if (my >= 0xffff)
1506 return AVERROR_INVALIDDATA;
1507
1508 s->mv[0][i][0] = mx;
1509 s->mv[0][i][1] = my;
1510 }
1511 } else {
1512 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1513 /* 16x16 motion prediction */
1514 s->mv_type = MV_TYPE_16X16;
1515 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1516 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1517
1518 if (mx >= 0xffff)
1519 return AVERROR_INVALIDDATA;
1520
1521 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1522
1523 if (my >= 0xffff)
1524 return AVERROR_INVALIDDATA;
1525 s->mv[0][0][0] = mx;
1526 s->mv[0][0][1] = my;
1527 }
1528 } else {
1529 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1530 s->mv_type = MV_TYPE_8X8;
1531 for (i = 0; i < 4; i++) {
1532 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1533 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1534 if (mx >= 0xffff)
1535 return AVERROR_INVALIDDATA;
1536
1537 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1538 if (my >= 0xffff)
1539 return AVERROR_INVALIDDATA;
1540 s->mv[0][i][0] = mx;
1541 s->mv[0][i][1] = my;
1542 mot_val[0] = mx;
1543 mot_val[1] = my;
1544 }
1545 }
1546 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1547 int modb1; // first bit of modb
1548 int modb2; // second bit of modb
1549 int mb_type;
1550
1551 s->mb_intra = 0; // B-frames never contain intra blocks
1552 s->mcsel = 0; // ... true gmc blocks
1553
1554 if (s->mb_x == 0) {
1555 for (i = 0; i < 2; i++) {
1556 s->last_mv[i][0][0] =
1557 s->last_mv[i][0][1] =
1558 s->last_mv[i][1][0] =
1559 s->last_mv[i][1][1] = 0;
1560 }
1561
1562 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1563 }
1564
1565 /* if we skipped it in the future P-frame than skip it now too */
1566 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1567
1568 if (s->mb_skipped) {
1569 /* skip mb */
1570 for (i = 0; i < 6; i++)
1571 s->block_last_index[i] = -1;
1572
1573 s->mv_dir = MV_DIR_FORWARD;
1574 s->mv_type = MV_TYPE_16X16;
1575 s->mv[0][0][0] =
1576 s->mv[0][0][1] =
1577 s->mv[1][0][0] =
1578 s->mv[1][0][1] = 0;
1579 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1580 MB_TYPE_16x16 |
1581 MB_TYPE_L0;
1582 goto end;
1583 }
1584
1585 modb1 = get_bits1(&s->gb);
1586 if (modb1) {
1587 // like MB_TYPE_B_DIRECT but no vectors coded
1588 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1589 cbp = 0;
1590 } else {
1591 modb2 = get_bits1(&s->gb);
1592 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1593 if (mb_type < 0) {
1594 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1595 return AVERROR_INVALIDDATA;
1596 }
1597 mb_type = mb_type_b_map[mb_type];
1598 if (modb2) {
1599 cbp = 0;
1600 } else {
1601 s->bdsp.clear_blocks(s->block[0]);
1602 cbp = get_bits(&s->gb, 6);
1603 }
1604
1605 if ((!IS_DIRECT(mb_type)) && cbp) {
1606 if (get_bits1(&s->gb))
1607 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1608 }
1609
1610 if (!s->progressive_sequence) {
1611 if (cbp)
1612 s->interlaced_dct = get_bits1(&s->gb);
1613
1614 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1615 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1616 mb_type &= ~MB_TYPE_16x16;
1617
1618 if (USES_LIST(mb_type, 0)) {
1619 s->field_select[0][0] = get_bits1(&s->gb);
1620 s->field_select[0][1] = get_bits1(&s->gb);
1621 }
1622 if (USES_LIST(mb_type, 1)) {
1623 s->field_select[1][0] = get_bits1(&s->gb);
1624 s->field_select[1][1] = get_bits1(&s->gb);
1625 }
1626 }
1627 }
1628
1629 s->mv_dir = 0;
1630 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1631 s->mv_type = MV_TYPE_16X16;
1632
1633 if (USES_LIST(mb_type, 0)) {
1634 s->mv_dir = MV_DIR_FORWARD;
1635
1636 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1637 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1638 s->last_mv[0][1][0] =
1639 s->last_mv[0][0][0] =
1640 s->mv[0][0][0] = mx;
1641 s->last_mv[0][1][1] =
1642 s->last_mv[0][0][1] =
1643 s->mv[0][0][1] = my;
1644 }
1645
1646 if (USES_LIST(mb_type, 1)) {
1647 s->mv_dir |= MV_DIR_BACKWARD;
1648
1649 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1650 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1651 s->last_mv[1][1][0] =
1652 s->last_mv[1][0][0] =
1653 s->mv[1][0][0] = mx;
1654 s->last_mv[1][1][1] =
1655 s->last_mv[1][0][1] =
1656 s->mv[1][0][1] = my;
1657 }
1658 } else if (!IS_DIRECT(mb_type)) {
1659 s->mv_type = MV_TYPE_FIELD;
1660
1661 if (USES_LIST(mb_type, 0)) {
1662 s->mv_dir = MV_DIR_FORWARD;
1663
1664 for (i = 0; i < 2; i++) {
1665 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1666 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1667 s->last_mv[0][i][0] =
1668 s->mv[0][i][0] = mx;
1669 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1670 }
1671 }
1672
1673 if (USES_LIST(mb_type, 1)) {
1674 s->mv_dir |= MV_DIR_BACKWARD;
1675
1676 for (i = 0; i < 2; i++) {
1677 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1678 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1679 s->last_mv[1][i][0] =
1680 s->mv[1][i][0] = mx;
1681 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1682 }
1683 }
1684 }
1685 }
1686
1687 if (IS_DIRECT(mb_type)) {
1688 if (IS_SKIP(mb_type)) {
1689 mx =
1690 my = 0;
1691 } else {
1692 mx = ff_h263_decode_motion(s, 0, 1);
1693 my = ff_h263_decode_motion(s, 0, 1);
1694 }
1695
1696 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1697 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1698 }
1699 s->current_picture.mb_type[xy] = mb_type;
1700 } else { /* I-Frame */
1701 do {
1702 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1703 if (cbpc < 0) {
1704 av_log(s->avctx, AV_LOG_ERROR,
1705 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1706 return AVERROR_INVALIDDATA;
1707 }
1708 } while (cbpc == 8);
1709
1710 dquant = cbpc & 4;
1711 s->mb_intra = 1;
1712
1713 intra:
1714 s->ac_pred = get_bits1(&s->gb);
1715 if (s->ac_pred)
1716 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1717 else
1718 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1719
1720 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1721 if (cbpy < 0) {
1722 av_log(s->avctx, AV_LOG_ERROR,
1723 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1724 return AVERROR_INVALIDDATA;
1725 }
1726 cbp = (cbpc & 3) | (cbpy << 2);
1727
1728 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1729
1730 if (dquant)
1731 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1732
1733 if (!s->progressive_sequence)
1734 s->interlaced_dct = get_bits1(&s->gb);
1735
1736 s->bdsp.clear_blocks(s->block[0]);
1737 /* decode each block */
1738 for (i = 0; i < 6; i++) {
1739 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1740 return AVERROR_INVALIDDATA;
1741 cbp += cbp;
1742 }
1743 goto end;
1744 }
1745
1746 /* decode each block */
1747 for (i = 0; i < 6; i++) {
1748 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1749 return AVERROR_INVALIDDATA;
1750 cbp += cbp;
1751 }
1752
1753 end:
1754 /* per-MB end of slice check */
1755 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1756 int next = mpeg4_is_resync(ctx);
1757 if (next) {
1758 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1759 return AVERROR_INVALIDDATA;
1760 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1761 return SLICE_END;
1762
1763 if (s->pict_type == AV_PICTURE_TYPE_B) {
1764 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1765 ff_thread_await_progress(&s->next_picture_ptr->tf,
1766 (s->mb_x + delta >= s->mb_width)
1767 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1768 : s->mb_y, 0);
1769 if (s->next_picture.mbskip_table[xy + delta])
1770 return SLICE_OK;
1771 }
1772
1773 return SLICE_END;
1774 }
1775 }
1776
1777 return SLICE_OK;
1778 }
1779
1780 /* As per spec, studio start code search isn't the same as the old type of start code */
next_start_code_studio(GetBitContext * gb)1781 static void next_start_code_studio(GetBitContext *gb)
1782 {
1783 align_get_bits(gb);
1784
1785 while (get_bits_left(gb) >= 24 && show_bits_long(gb, 24) != 0x1) {
1786 get_bits(gb, 8);
1787 }
1788 }
1789
1790 /* additional_code, vlc index */
1791 static const uint8_t ac_state_tab[22][2] =
1792 {
1793 {0, 0},
1794 {0, 1},
1795 {1, 1},
1796 {2, 1},
1797 {3, 1},
1798 {4, 1},
1799 {5, 1},
1800 {1, 2},
1801 {2, 2},
1802 {3, 2},
1803 {4, 2},
1804 {5, 2},
1805 {6, 2},
1806 {1, 3},
1807 {2, 4},
1808 {3, 5},
1809 {4, 6},
1810 {5, 7},
1811 {6, 8},
1812 {7, 9},
1813 {8, 10},
1814 {0, 11}
1815 };
1816
mpeg4_decode_studio_block(MpegEncContext * s,int32_t block[64],int n)1817 static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
1818 {
1819 Mpeg4DecContext *ctx = s->avctx->priv_data;
1820
1821 int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
1822 additional_code_len, sign, mismatch;
1823 VLC *cur_vlc = &ctx->studio_intra_tab[0];
1824 uint8_t *const scantable = s->intra_scantable.permutated;
1825 const uint16_t *quant_matrix;
1826 uint32_t flc;
1827 const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
1828 const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
1829
1830 mismatch = 1;
1831
1832 memset(block, 0, 64 * sizeof(int32_t));
1833
1834 if (n < 4) {
1835 cc = 0;
1836 dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1837 quant_matrix = s->intra_matrix;
1838 } else {
1839 cc = (n & 1) + 1;
1840 if (ctx->rgb)
1841 dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1842 else
1843 dct_dc_size = get_vlc2(&s->gb, ctx->studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1844 quant_matrix = s->chroma_intra_matrix;
1845 }
1846
1847 if (dct_dc_size < 0) {
1848 av_log(s->avctx, AV_LOG_ERROR, "illegal dct_dc_size vlc\n");
1849 return AVERROR_INVALIDDATA;
1850 } else if (dct_dc_size == 0) {
1851 dct_diff = 0;
1852 } else {
1853 dct_diff = get_xbits(&s->gb, dct_dc_size);
1854
1855 if (dct_dc_size > 8) {
1856 if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1857 return AVERROR_INVALIDDATA;
1858 }
1859
1860 }
1861
1862 s->last_dc[cc] += dct_diff;
1863
1864 if (s->mpeg_quant)
1865 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1866 else
1867 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1868 /* TODO: support mpeg_quant for AC coefficients */
1869
1870 block[0] = av_clip(block[0], min, max);
1871 mismatch ^= block[0];
1872
1873 /* AC Coefficients */
1874 while (1) {
1875 group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1876
1877 if (group < 0) {
1878 av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1879 return AVERROR_INVALIDDATA;
1880 }
1881
1882 additional_code_len = ac_state_tab[group][0];
1883 cur_vlc = &ctx->studio_intra_tab[ac_state_tab[group][1]];
1884
1885 if (group == 0) {
1886 /* End of Block */
1887 break;
1888 } else if (group >= 1 && group <= 6) {
1889 /* Zero run length (Table B.47) */
1890 run = 1 << additional_code_len;
1891 if (additional_code_len)
1892 run += get_bits(&s->gb, additional_code_len);
1893 idx += run;
1894 continue;
1895 } else if (group >= 7 && group <= 12) {
1896 /* Zero run length and +/-1 level (Table B.48) */
1897 code = get_bits(&s->gb, additional_code_len);
1898 sign = code & 1;
1899 code >>= 1;
1900 run = (1 << (additional_code_len - 1)) + code;
1901 idx += run;
1902 if (idx > 63)
1903 return AVERROR_INVALIDDATA;
1904 j = scantable[idx++];
1905 block[j] = sign ? 1 : -1;
1906 } else if (group >= 13 && group <= 20) {
1907 /* Level value (Table B.49) */
1908 if (idx > 63)
1909 return AVERROR_INVALIDDATA;
1910 j = scantable[idx++];
1911 block[j] = get_xbits(&s->gb, additional_code_len);
1912 } else if (group == 21) {
1913 /* Escape */
1914 if (idx > 63)
1915 return AVERROR_INVALIDDATA;
1916 j = scantable[idx++];
1917 additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1918 flc = get_bits(&s->gb, additional_code_len);
1919 if (flc >> (additional_code_len-1))
1920 block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1921 else
1922 block[j] = flc;
1923 }
1924 block[j] = ((8 * 2 * block[j] * quant_matrix[j] * s->qscale) >> s->dct_precision) / 32;
1925 block[j] = av_clip(block[j], min, max);
1926 mismatch ^= block[j];
1927 }
1928
1929 block[63] ^= mismatch & 1;
1930
1931 return 0;
1932 }
1933
mpeg4_decode_dpcm_macroblock(MpegEncContext * s,int16_t macroblock[256],int n)1934 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
1935 {
1936 int i, j, w, h, idx = 0;
1937 int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
1938 dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
1939 h = 16 >> (n ? s->chroma_y_shift : 0);
1940 w = 16 >> (n ? s->chroma_x_shift : 0);
1941
1942 block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1943 if (block_mean == 0){
1944 av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
1945 return AVERROR_INVALIDDATA;
1946 }
1947 s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
1948
1949 rice_parameter = get_bits(&s->gb, 4);
1950 if (rice_parameter == 0) {
1951 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1952 return AVERROR_INVALIDDATA;
1953 }
1954
1955 if (rice_parameter == 15)
1956 rice_parameter = 0;
1957
1958 if (rice_parameter > 11) {
1959 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1960 return AVERROR_INVALIDDATA;
1961 }
1962
1963 for (i = 0; i < h; i++) {
1964 output = 1 << (s->avctx->bits_per_raw_sample - 1);
1965 top = 1 << (s->avctx->bits_per_raw_sample - 1);
1966
1967 for (j = 0; j < w; j++) {
1968 left = output;
1969 topleft = top;
1970
1971 rice_prefix_code = get_unary(&s->gb, 1, 12);
1972
1973 /* Escape */
1974 if (rice_prefix_code == 11)
1975 dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1976 else {
1977 if (rice_prefix_code == 12) {
1978 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
1979 return AVERROR_INVALIDDATA;
1980 }
1981 rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
1982 dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
1983 }
1984
1985 /* Map to a signed residual */
1986 if (dpcm_residual & 1)
1987 dpcm_residual = (-1 * dpcm_residual) >> 1;
1988 else
1989 dpcm_residual = (dpcm_residual >> 1);
1990
1991 if (i != 0)
1992 top = macroblock[idx-w];
1993
1994 p = left + top - topleft;
1995 min_left_top = FFMIN(left, top);
1996 if (p < min_left_top)
1997 p = min_left_top;
1998
1999 max_left_top = FFMAX(left, top);
2000 if (p > max_left_top)
2001 p = max_left_top;
2002
2003 p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2004 if (p2 == p)
2005 p2 = block_mean;
2006
2007 if (p2 > p)
2008 dpcm_residual *= -1;
2009
2010 macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2011 }
2012 }
2013
2014 return 0;
2015 }
2016
mpeg4_decode_studio_mb(MpegEncContext * s,int16_t block_[12][64])2017 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2018 {
2019 int i;
2020
2021 s->dpcm_direction = 0;
2022
2023 /* StudioMacroblock */
2024 /* Assumes I-VOP */
2025 s->mb_intra = 1;
2026 if (get_bits1(&s->gb)) { /* compression_mode */
2027 /* DCT */
2028 /* macroblock_type, 1 or 2-bit VLC */
2029 if (!get_bits1(&s->gb)) {
2030 skip_bits1(&s->gb);
2031 s->qscale = mpeg_get_qscale(s);
2032 }
2033
2034 for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2035 if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
2036 return AVERROR_INVALIDDATA;
2037 }
2038 } else {
2039 /* DPCM */
2040 check_marker(s->avctx, &s->gb, "DPCM block start");
2041 s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2042 for (i = 0; i < 3; i++) {
2043 if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
2044 return AVERROR_INVALIDDATA;
2045 }
2046 }
2047
2048 if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2049 next_start_code_studio(&s->gb);
2050 return SLICE_END;
2051 }
2052
2053 //vcon-stp9L1.bits (first frame)
2054 if (get_bits_left(&s->gb) == 0)
2055 return SLICE_END;
2056
2057 //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2058 if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2059 return SLICE_END;
2060
2061 return SLICE_OK;
2062 }
2063
mpeg4_decode_gop_header(MpegEncContext * s,GetBitContext * gb)2064 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
2065 {
2066 int hours, minutes, seconds;
2067
2068 if (!show_bits(gb, 23)) {
2069 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2070 return AVERROR_INVALIDDATA;
2071 }
2072
2073 hours = get_bits(gb, 5);
2074 minutes = get_bits(gb, 6);
2075 check_marker(s->avctx, gb, "in gop_header");
2076 seconds = get_bits(gb, 6);
2077
2078 s->time_base = seconds + 60*(minutes + 60*hours);
2079
2080 skip_bits1(gb);
2081 skip_bits1(gb);
2082
2083 return 0;
2084 }
2085
mpeg4_decode_profile_level(MpegEncContext * s,GetBitContext * gb,int * profile,int * level)2086 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
2087 {
2088
2089 *profile = get_bits(gb, 4);
2090 *level = get_bits(gb, 4);
2091
2092 // for Simple profile, level 0
2093 if (*profile == 0 && *level == 8) {
2094 *level = 0;
2095 }
2096
2097 return 0;
2098 }
2099
mpeg4_decode_visual_object(MpegEncContext * s,GetBitContext * gb)2100 static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
2101 {
2102 int visual_object_type;
2103 int is_visual_object_identifier = get_bits1(gb);
2104
2105 if (is_visual_object_identifier) {
2106 skip_bits(gb, 4+3);
2107 }
2108 visual_object_type = get_bits(gb, 4);
2109
2110 if (visual_object_type == VOT_VIDEO_ID ||
2111 visual_object_type == VOT_STILL_TEXTURE_ID) {
2112 int video_signal_type = get_bits1(gb);
2113 if (video_signal_type) {
2114 int video_range, color_description;
2115 skip_bits(gb, 3); // video_format
2116 video_range = get_bits1(gb);
2117 color_description = get_bits1(gb);
2118
2119 s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2120
2121 if (color_description) {
2122 s->avctx->color_primaries = get_bits(gb, 8);
2123 s->avctx->color_trc = get_bits(gb, 8);
2124 s->avctx->colorspace = get_bits(gb, 8);
2125 }
2126 }
2127 }
2128
2129 return 0;
2130 }
2131
mpeg4_load_default_matrices(MpegEncContext * s)2132 static void mpeg4_load_default_matrices(MpegEncContext *s)
2133 {
2134 int i, v;
2135
2136 /* load default matrices */
2137 for (i = 0; i < 64; i++) {
2138 int j = s->idsp.idct_permutation[i];
2139 v = ff_mpeg4_default_intra_matrix[i];
2140 s->intra_matrix[j] = v;
2141 s->chroma_intra_matrix[j] = v;
2142
2143 v = ff_mpeg4_default_non_intra_matrix[i];
2144 s->inter_matrix[j] = v;
2145 s->chroma_inter_matrix[j] = v;
2146 }
2147 }
2148
decode_vol_header(Mpeg4DecContext * ctx,GetBitContext * gb)2149 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2150 {
2151 MpegEncContext *s = &ctx->m;
2152 int width, height, vo_ver_id;
2153
2154 /* vol header */
2155 skip_bits(gb, 1); /* random access */
2156 s->vo_type = get_bits(gb, 8);
2157
2158 /* If we are in studio profile (per vo_type), check if its all consistent
2159 * and if so continue pass control to decode_studio_vol_header().
2160 * elIf something is inconsistent, error out
2161 * else continue with (non studio) vol header decpoding.
2162 */
2163 if (s->vo_type == CORE_STUDIO_VO_TYPE ||
2164 s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
2165 if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
2166 return AVERROR_INVALIDDATA;
2167 s->studio_profile = 1;
2168 s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
2169 return decode_studio_vol_header(ctx, gb);
2170 } else if (s->studio_profile) {
2171 return AVERROR_PATCHWELCOME;
2172 }
2173
2174 if (get_bits1(gb) != 0) { /* is_ol_id */
2175 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2176 skip_bits(gb, 3); /* vo_priority */
2177 } else {
2178 vo_ver_id = 1;
2179 }
2180 s->aspect_ratio_info = get_bits(gb, 4);
2181 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2182 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2183 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2184 } else {
2185 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2186 }
2187
2188 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2189 int chroma_format = get_bits(gb, 2);
2190 if (chroma_format != CHROMA_420)
2191 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2192
2193 s->low_delay = get_bits1(gb);
2194 if (get_bits1(gb)) { /* vbv parameters */
2195 get_bits(gb, 15); /* first_half_bitrate */
2196 check_marker(s->avctx, gb, "after first_half_bitrate");
2197 get_bits(gb, 15); /* latter_half_bitrate */
2198 check_marker(s->avctx, gb, "after latter_half_bitrate");
2199 get_bits(gb, 15); /* first_half_vbv_buffer_size */
2200 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2201 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2202 get_bits(gb, 11); /* first_half_vbv_occupancy */
2203 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2204 get_bits(gb, 15); /* latter_half_vbv_occupancy */
2205 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2206 }
2207 } else {
2208 /* is setting low delay flag only once the smartest thing to do?
2209 * low delay detection will not be overridden. */
2210 if (s->picture_number == 0) {
2211 switch(s->vo_type) {
2212 case SIMPLE_VO_TYPE:
2213 case ADV_SIMPLE_VO_TYPE:
2214 s->low_delay = 1;
2215 break;
2216 default:
2217 s->low_delay = 0;
2218 }
2219 }
2220 }
2221
2222 ctx->shape = get_bits(gb, 2); /* vol shape */
2223 if (ctx->shape != RECT_SHAPE)
2224 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2225 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2226 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2227 skip_bits(gb, 4); /* video_object_layer_shape_extension */
2228 }
2229
2230 check_marker(s->avctx, gb, "before time_increment_resolution");
2231
2232 s->avctx->framerate.num = get_bits(gb, 16);
2233 if (!s->avctx->framerate.num) {
2234 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2235 return AVERROR_INVALIDDATA;
2236 }
2237
2238 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2239 if (ctx->time_increment_bits < 1)
2240 ctx->time_increment_bits = 1;
2241
2242 check_marker(s->avctx, gb, "before fixed_vop_rate");
2243
2244 if (get_bits1(gb) != 0) /* fixed_vop_rate */
2245 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2246 else
2247 s->avctx->framerate.den = 1;
2248
2249 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2250
2251 ctx->t_frame = 0;
2252
2253 if (ctx->shape != BIN_ONLY_SHAPE) {
2254 if (ctx->shape == RECT_SHAPE) {
2255 check_marker(s->avctx, gb, "before width");
2256 width = get_bits(gb, 13);
2257 check_marker(s->avctx, gb, "before height");
2258 height = get_bits(gb, 13);
2259 check_marker(s->avctx, gb, "after height");
2260 if (width && height && /* they should be non zero but who knows */
2261 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2262 if (s->width && s->height &&
2263 (s->width != width || s->height != height))
2264 s->context_reinit = 1;
2265 s->width = width;
2266 s->height = height;
2267 }
2268 }
2269
2270 s->progressive_sequence =
2271 s->progressive_frame = get_bits1(gb) ^ 1;
2272 s->interlaced_dct = 0;
2273 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2274 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2275 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2276 if (vo_ver_id == 1)
2277 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2278 else
2279 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2280
2281 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2282 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2283 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2284 ctx->vol_sprite_usage == GMC_SPRITE) {
2285 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2286 skip_bits(gb, 13); // sprite_width
2287 check_marker(s->avctx, gb, "after sprite_width");
2288 skip_bits(gb, 13); // sprite_height
2289 check_marker(s->avctx, gb, "after sprite_height");
2290 skip_bits(gb, 13); // sprite_left
2291 check_marker(s->avctx, gb, "after sprite_left");
2292 skip_bits(gb, 13); // sprite_top
2293 check_marker(s->avctx, gb, "after sprite_top");
2294 }
2295 ctx->num_sprite_warping_points = get_bits(gb, 6);
2296 if (ctx->num_sprite_warping_points > 3) {
2297 av_log(s->avctx, AV_LOG_ERROR,
2298 "%d sprite_warping_points\n",
2299 ctx->num_sprite_warping_points);
2300 ctx->num_sprite_warping_points = 0;
2301 return AVERROR_INVALIDDATA;
2302 }
2303 s->sprite_warping_accuracy = get_bits(gb, 2);
2304 ctx->sprite_brightness_change = get_bits1(gb);
2305 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2306 skip_bits1(gb); // low_latency_sprite
2307 }
2308 // FIXME sadct disable bit if verid!=1 && shape not rect
2309
2310 if (get_bits1(gb) == 1) { /* not_8_bit */
2311 s->quant_precision = get_bits(gb, 4); /* quant_precision */
2312 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2313 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2314 if (s->quant_precision != 5)
2315 av_log(s->avctx, AV_LOG_ERROR,
2316 "quant precision %d\n", s->quant_precision);
2317 if (s->quant_precision<3 || s->quant_precision>9) {
2318 s->quant_precision = 5;
2319 }
2320 } else {
2321 s->quant_precision = 5;
2322 }
2323
2324 // FIXME a bunch of grayscale shape things
2325
2326 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2327 int i, v;
2328
2329 mpeg4_load_default_matrices(s);
2330
2331 /* load custom intra matrix */
2332 if (get_bits1(gb)) {
2333 int last = 0;
2334 for (i = 0; i < 64; i++) {
2335 int j;
2336 if (get_bits_left(gb) < 8) {
2337 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2338 return AVERROR_INVALIDDATA;
2339 }
2340 v = get_bits(gb, 8);
2341 if (v == 0)
2342 break;
2343
2344 last = v;
2345 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2346 s->intra_matrix[j] = last;
2347 s->chroma_intra_matrix[j] = last;
2348 }
2349
2350 /* replicate last value */
2351 for (; i < 64; i++) {
2352 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2353 s->intra_matrix[j] = last;
2354 s->chroma_intra_matrix[j] = last;
2355 }
2356 }
2357
2358 /* load custom non intra matrix */
2359 if (get_bits1(gb)) {
2360 int last = 0;
2361 for (i = 0; i < 64; i++) {
2362 int j;
2363 if (get_bits_left(gb) < 8) {
2364 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2365 return AVERROR_INVALIDDATA;
2366 }
2367 v = get_bits(gb, 8);
2368 if (v == 0)
2369 break;
2370
2371 last = v;
2372 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2373 s->inter_matrix[j] = v;
2374 s->chroma_inter_matrix[j] = v;
2375 }
2376
2377 /* replicate last value */
2378 for (; i < 64; i++) {
2379 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2380 s->inter_matrix[j] = last;
2381 s->chroma_inter_matrix[j] = last;
2382 }
2383 }
2384
2385 // FIXME a bunch of grayscale shape things
2386 }
2387
2388 if (vo_ver_id != 1)
2389 s->quarter_sample = get_bits1(gb);
2390 else
2391 s->quarter_sample = 0;
2392
2393 if (get_bits_left(gb) < 4) {
2394 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2395 return AVERROR_INVALIDDATA;
2396 }
2397
2398 if (!get_bits1(gb)) {
2399 int pos = get_bits_count(gb);
2400 int estimation_method = get_bits(gb, 2);
2401 if (estimation_method < 2) {
2402 if (!get_bits1(gb)) {
2403 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2404 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2405 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2406 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2407 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2408 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2409 }
2410 if (!get_bits1(gb)) {
2411 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2412 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2413 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2414 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2415 }
2416 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2417 skip_bits_long(gb, pos - get_bits_count(gb));
2418 goto no_cplx_est;
2419 }
2420 if (!get_bits1(gb)) {
2421 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2422 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2423 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2424 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2425 }
2426 if (!get_bits1(gb)) {
2427 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2428 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2429 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2430 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2431 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2432 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2433 }
2434 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2435 skip_bits_long(gb, pos - get_bits_count(gb));
2436 goto no_cplx_est;
2437 }
2438 if (estimation_method == 1) {
2439 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2440 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2441 }
2442 } else
2443 av_log(s->avctx, AV_LOG_ERROR,
2444 "Invalid Complexity estimation method %d\n",
2445 estimation_method);
2446 } else {
2447
2448 no_cplx_est:
2449 ctx->cplx_estimation_trash_i =
2450 ctx->cplx_estimation_trash_p =
2451 ctx->cplx_estimation_trash_b = 0;
2452 }
2453
2454 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2455
2456 s->data_partitioning = get_bits1(gb);
2457 if (s->data_partitioning)
2458 ctx->rvlc = get_bits1(gb);
2459
2460 if (vo_ver_id != 1) {
2461 ctx->new_pred = get_bits1(gb);
2462 if (ctx->new_pred) {
2463 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2464 skip_bits(gb, 2); /* requested upstream message type */
2465 skip_bits1(gb); /* newpred segment type */
2466 }
2467 if (get_bits1(gb)) // reduced_res_vop
2468 av_log(s->avctx, AV_LOG_ERROR,
2469 "reduced resolution VOP not supported\n");
2470 } else {
2471 ctx->new_pred = 0;
2472 }
2473
2474 ctx->scalability = get_bits1(gb);
2475
2476 if (ctx->scalability) {
2477 GetBitContext bak = *gb;
2478 int h_sampling_factor_n;
2479 int h_sampling_factor_m;
2480 int v_sampling_factor_n;
2481 int v_sampling_factor_m;
2482
2483 skip_bits1(gb); // hierarchy_type
2484 skip_bits(gb, 4); /* ref_layer_id */
2485 skip_bits1(gb); /* ref_layer_sampling_dir */
2486 h_sampling_factor_n = get_bits(gb, 5);
2487 h_sampling_factor_m = get_bits(gb, 5);
2488 v_sampling_factor_n = get_bits(gb, 5);
2489 v_sampling_factor_m = get_bits(gb, 5);
2490 ctx->enhancement_type = get_bits1(gb);
2491
2492 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2493 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2494 /* illegal scalability header (VERY broken encoder),
2495 * trying to workaround */
2496 ctx->scalability = 0;
2497 *gb = bak;
2498 } else
2499 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2500
2501 // bin shape stuff FIXME
2502 }
2503 }
2504
2505 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2506 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2507 s->avctx->framerate.den, s->avctx->framerate.num,
2508 ctx->time_increment_bits,
2509 s->quant_precision,
2510 s->progressive_sequence,
2511 s->low_delay,
2512 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2513 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2514 );
2515 }
2516
2517 return 0;
2518 }
2519
2520 /**
2521 * Decode the user data stuff in the header.
2522 * Also initializes divx/xvid/lavc_version/build.
2523 */
decode_user_data(Mpeg4DecContext * ctx,GetBitContext * gb)2524 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2525 {
2526 MpegEncContext *s = &ctx->m;
2527 char buf[256];
2528 int i;
2529 int e;
2530 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2531 char last;
2532
2533 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2534 if (show_bits(gb, 23) == 0)
2535 break;
2536 buf[i] = get_bits(gb, 8);
2537 }
2538 buf[i] = 0;
2539
2540 /* divx detection */
2541 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2542 if (e < 2)
2543 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2544 if (e >= 2) {
2545 ctx->divx_version = ver;
2546 ctx->divx_build = build;
2547 s->divx_packed = e == 3 && last == 'p';
2548 }
2549
2550 /* libavcodec detection */
2551 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2552 if (e != 4)
2553 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2554 if (e != 4) {
2555 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2556 if (e > 1) {
2557 if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2558 av_log(s->avctx, AV_LOG_WARNING,
2559 "Unknown Lavc version string encountered, %d.%d.%d; "
2560 "clamping sub-version values to 8-bits.\n",
2561 ver, ver2, ver3);
2562 }
2563 build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2564 }
2565 }
2566 if (e != 4) {
2567 if (strcmp(buf, "ffmpeg") == 0)
2568 ctx->lavc_build = 4600;
2569 }
2570 if (e == 4)
2571 ctx->lavc_build = build;
2572
2573 /* Xvid detection */
2574 e = sscanf(buf, "XviD%d", &build);
2575 if (e == 1)
2576 ctx->xvid_build = build;
2577
2578 return 0;
2579 }
2580
ff_mpeg4_workaround_bugs(AVCodecContext * avctx)2581 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2582 {
2583 Mpeg4DecContext *ctx = avctx->priv_data;
2584 MpegEncContext *s = &ctx->m;
2585
2586 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2587 if (s->codec_tag == AV_RL32("XVID") ||
2588 s->codec_tag == AV_RL32("XVIX") ||
2589 s->codec_tag == AV_RL32("RMP4") ||
2590 s->codec_tag == AV_RL32("ZMP4") ||
2591 s->codec_tag == AV_RL32("SIPP"))
2592 ctx->xvid_build = 0;
2593 }
2594
2595 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2596 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2597 ctx->vol_control_parameters == 0)
2598 ctx->divx_version = 400; // divx 4
2599
2600 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2601 ctx->divx_version =
2602 ctx->divx_build = -1;
2603 }
2604
2605 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2606 if (s->codec_tag == AV_RL32("XVIX"))
2607 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2608
2609 if (s->codec_tag == AV_RL32("UMP4"))
2610 s->workaround_bugs |= FF_BUG_UMP4;
2611
2612 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2613 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2614
2615 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2616 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2617
2618 if (ctx->xvid_build <= 3U)
2619 s->padding_bug_score = 256 * 256 * 256 * 64;
2620
2621 if (ctx->xvid_build <= 1U)
2622 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2623
2624 if (ctx->xvid_build <= 12U)
2625 s->workaround_bugs |= FF_BUG_EDGE;
2626
2627 if (ctx->xvid_build <= 32U)
2628 s->workaround_bugs |= FF_BUG_DC_CLIP;
2629
2630 #define SET_QPEL_FUNC(postfix1, postfix2) \
2631 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2632 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2633 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2634
2635 if (ctx->lavc_build < 4653U)
2636 s->workaround_bugs |= FF_BUG_STD_QPEL;
2637
2638 if (ctx->lavc_build < 4655U)
2639 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2640
2641 if (ctx->lavc_build < 4670U)
2642 s->workaround_bugs |= FF_BUG_EDGE;
2643
2644 if (ctx->lavc_build <= 4712U)
2645 s->workaround_bugs |= FF_BUG_DC_CLIP;
2646
2647 if ((ctx->lavc_build&0xFF) >= 100) {
2648 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2649 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2650 )
2651 s->workaround_bugs |= FF_BUG_IEDGE;
2652 }
2653
2654 if (ctx->divx_version >= 0)
2655 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2656 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2657 s->padding_bug_score = 256 * 256 * 256 * 64;
2658
2659 if (ctx->divx_version < 500U)
2660 s->workaround_bugs |= FF_BUG_EDGE;
2661
2662 if (ctx->divx_version >= 0)
2663 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2664 }
2665
2666 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2667 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2668 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2669 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2670 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2671 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2672 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2673
2674 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2675 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2676 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2677 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2678 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2679 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2680 }
2681
2682 if (avctx->debug & FF_DEBUG_BUGS)
2683 av_log(s->avctx, AV_LOG_DEBUG,
2684 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2685 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2686 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2687
2688 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2689 s->codec_id == AV_CODEC_ID_MPEG4 &&
2690 avctx->idct_algo == FF_IDCT_AUTO) {
2691 avctx->idct_algo = FF_IDCT_XVID;
2692 ff_mpv_idct_init(s);
2693 return 1;
2694 }
2695
2696 return 0;
2697 }
2698
decode_vop_header(Mpeg4DecContext * ctx,GetBitContext * gb)2699 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2700 {
2701 MpegEncContext *s = &ctx->m;
2702 int time_incr, time_increment;
2703 int64_t pts;
2704
2705 s->mcsel = 0;
2706 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2707 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2708 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2709 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2710 s->low_delay = 0;
2711 }
2712
2713 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2714 if (s->partitioned_frame)
2715 s->decode_mb = mpeg4_decode_partitioned_mb;
2716 else
2717 s->decode_mb = mpeg4_decode_mb;
2718
2719 time_incr = 0;
2720 while (get_bits1(gb) != 0)
2721 time_incr++;
2722
2723 check_marker(s->avctx, gb, "before time_increment");
2724
2725 if (ctx->time_increment_bits == 0 ||
2726 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2727 av_log(s->avctx, AV_LOG_WARNING,
2728 "time_increment_bits %d is invalid in relation to the current bitstream, this is likely caused by a missing VOL header\n", ctx->time_increment_bits);
2729
2730 for (ctx->time_increment_bits = 1;
2731 ctx->time_increment_bits < 16;
2732 ctx->time_increment_bits++) {
2733 if (s->pict_type == AV_PICTURE_TYPE_P ||
2734 (s->pict_type == AV_PICTURE_TYPE_S &&
2735 ctx->vol_sprite_usage == GMC_SPRITE)) {
2736 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2737 break;
2738 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2739 break;
2740 }
2741
2742 av_log(s->avctx, AV_LOG_WARNING,
2743 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2744 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2745 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2746 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2747 }
2748 }
2749
2750 if (IS_3IV1)
2751 time_increment = get_bits1(gb); // FIXME investigate further
2752 else
2753 time_increment = get_bits(gb, ctx->time_increment_bits);
2754
2755 if (s->pict_type != AV_PICTURE_TYPE_B) {
2756 s->last_time_base = s->time_base;
2757 s->time_base += time_incr;
2758 s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2759 if (s->workaround_bugs & FF_BUG_UMP4) {
2760 if (s->time < s->last_non_b_time) {
2761 /* header is not mpeg-4-compatible, broken encoder,
2762 * trying to workaround */
2763 s->time_base++;
2764 s->time += s->avctx->framerate.num;
2765 }
2766 }
2767 s->pp_time = s->time - s->last_non_b_time;
2768 s->last_non_b_time = s->time;
2769 } else {
2770 s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2771 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2772 if (s->pp_time <= s->pb_time ||
2773 s->pp_time <= s->pp_time - s->pb_time ||
2774 s->pp_time <= 0) {
2775 /* messed up order, maybe after seeking? skipping current B-frame */
2776 return FRAME_SKIPPED;
2777 }
2778 ff_mpeg4_init_direct_mv(s);
2779
2780 if (ctx->t_frame == 0)
2781 ctx->t_frame = s->pb_time;
2782 if (ctx->t_frame == 0)
2783 ctx->t_frame = 1; // 1/0 protection
2784 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2785 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2786 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2787 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2788 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2789 s->pb_field_time = 2;
2790 s->pp_field_time = 4;
2791 if (!s->progressive_sequence)
2792 return FRAME_SKIPPED;
2793 }
2794 }
2795
2796 if (s->avctx->framerate.den)
2797 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2798 else
2799 pts = AV_NOPTS_VALUE;
2800 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2801
2802 check_marker(s->avctx, gb, "before vop_coded");
2803
2804 /* vop coded */
2805 if (get_bits1(gb) != 1) {
2806 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2807 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2808 return FRAME_SKIPPED;
2809 }
2810 if (ctx->new_pred)
2811 decode_new_pred(ctx, gb);
2812
2813 if (ctx->shape != BIN_ONLY_SHAPE &&
2814 (s->pict_type == AV_PICTURE_TYPE_P ||
2815 (s->pict_type == AV_PICTURE_TYPE_S &&
2816 ctx->vol_sprite_usage == GMC_SPRITE))) {
2817 /* rounding type for motion estimation */
2818 s->no_rounding = get_bits1(gb);
2819 } else {
2820 s->no_rounding = 0;
2821 }
2822 // FIXME reduced res stuff
2823
2824 if (ctx->shape != RECT_SHAPE) {
2825 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2826 skip_bits(gb, 13); /* width */
2827 check_marker(s->avctx, gb, "after width");
2828 skip_bits(gb, 13); /* height */
2829 check_marker(s->avctx, gb, "after height");
2830 skip_bits(gb, 13); /* hor_spat_ref */
2831 check_marker(s->avctx, gb, "after hor_spat_ref");
2832 skip_bits(gb, 13); /* ver_spat_ref */
2833 }
2834 skip_bits1(gb); /* change_CR_disable */
2835
2836 if (get_bits1(gb) != 0)
2837 skip_bits(gb, 8); /* constant_alpha_value */
2838 }
2839
2840 // FIXME complexity estimation stuff
2841
2842 if (ctx->shape != BIN_ONLY_SHAPE) {
2843 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2844 if (s->pict_type != AV_PICTURE_TYPE_I)
2845 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2846 if (s->pict_type == AV_PICTURE_TYPE_B)
2847 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2848
2849 if (get_bits_left(gb) < 3) {
2850 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2851 return AVERROR_INVALIDDATA;
2852 }
2853 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2854 if (!s->progressive_sequence) {
2855 s->top_field_first = get_bits1(gb);
2856 s->alternate_scan = get_bits1(gb);
2857 } else
2858 s->alternate_scan = 0;
2859 }
2860
2861 if (s->alternate_scan) {
2862 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2863 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2864 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2865 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2866 } else {
2867 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2868 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2869 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2870 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2871 }
2872
2873 if (s->pict_type == AV_PICTURE_TYPE_S) {
2874 if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2875 ctx->vol_sprite_usage == GMC_SPRITE)) {
2876 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2877 return AVERROR_INVALIDDATA;
2878 if (ctx->sprite_brightness_change)
2879 av_log(s->avctx, AV_LOG_ERROR,
2880 "sprite_brightness_change not supported\n");
2881 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2882 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2883 } else {
2884 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2885 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2886 }
2887 }
2888
2889 if (ctx->shape != BIN_ONLY_SHAPE) {
2890 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2891 if (s->qscale == 0) {
2892 av_log(s->avctx, AV_LOG_ERROR,
2893 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2894 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2895 }
2896
2897 if (s->pict_type != AV_PICTURE_TYPE_I) {
2898 s->f_code = get_bits(gb, 3); /* fcode_for */
2899 if (s->f_code == 0) {
2900 av_log(s->avctx, AV_LOG_ERROR,
2901 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2902 s->f_code = 1;
2903 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2904 }
2905 } else
2906 s->f_code = 1;
2907
2908 if (s->pict_type == AV_PICTURE_TYPE_B) {
2909 s->b_code = get_bits(gb, 3);
2910 if (s->b_code == 0) {
2911 av_log(s->avctx, AV_LOG_ERROR,
2912 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2913 s->b_code=1;
2914 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2915 }
2916 } else
2917 s->b_code = 1;
2918
2919 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2920 av_log(s->avctx, AV_LOG_DEBUG,
2921 "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d time:%"PRId64" tincr:%d\n",
2922 s->qscale, s->f_code, s->b_code,
2923 s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
2924 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2925 s->top_field_first, s->quarter_sample ? "q" : "h",
2926 s->data_partitioning, ctx->resync_marker,
2927 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2928 1 - s->no_rounding, s->vo_type,
2929 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2930 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2931 ctx->cplx_estimation_trash_b,
2932 s->time,
2933 time_increment
2934 );
2935 }
2936
2937 if (!ctx->scalability) {
2938 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2939 skip_bits1(gb); // vop shape coding type
2940 } else {
2941 if (ctx->enhancement_type) {
2942 int load_backward_shape = get_bits1(gb);
2943 if (load_backward_shape)
2944 av_log(s->avctx, AV_LOG_ERROR,
2945 "load backward shape isn't supported\n");
2946 }
2947 skip_bits(gb, 2); // ref_select_code
2948 }
2949 }
2950 /* detect buggy encoders which don't set the low_delay flag
2951 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2952 * easily (although it's buggy too) */
2953 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2954 ctx->divx_version == -1 && s->picture_number == 0) {
2955 av_log(s->avctx, AV_LOG_WARNING,
2956 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2957 s->low_delay = 1;
2958 }
2959
2960 s->picture_number++; // better than pic number==0 always ;)
2961
2962 // FIXME add short header support
2963 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2964 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2965
2966 if (s->workaround_bugs & FF_BUG_EDGE) {
2967 s->h_edge_pos = s->width;
2968 s->v_edge_pos = s->height;
2969 }
2970 return 0;
2971 }
2972
read_quant_matrix_ext(MpegEncContext * s,GetBitContext * gb)2973 static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
2974 {
2975 int i, j, v;
2976
2977 if (get_bits1(gb)) {
2978 if (get_bits_left(gb) < 64*8)
2979 return AVERROR_INVALIDDATA;
2980 /* intra_quantiser_matrix */
2981 for (i = 0; i < 64; i++) {
2982 v = get_bits(gb, 8);
2983 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2984 s->intra_matrix[j] = v;
2985 s->chroma_intra_matrix[j] = v;
2986 }
2987 }
2988
2989 if (get_bits1(gb)) {
2990 if (get_bits_left(gb) < 64*8)
2991 return AVERROR_INVALIDDATA;
2992 /* non_intra_quantiser_matrix */
2993 for (i = 0; i < 64; i++) {
2994 get_bits(gb, 8);
2995 }
2996 }
2997
2998 if (get_bits1(gb)) {
2999 if (get_bits_left(gb) < 64*8)
3000 return AVERROR_INVALIDDATA;
3001 /* chroma_intra_quantiser_matrix */
3002 for (i = 0; i < 64; i++) {
3003 v = get_bits(gb, 8);
3004 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
3005 s->chroma_intra_matrix[j] = v;
3006 }
3007 }
3008
3009 if (get_bits1(gb)) {
3010 if (get_bits_left(gb) < 64*8)
3011 return AVERROR_INVALIDDATA;
3012 /* chroma_non_intra_quantiser_matrix */
3013 for (i = 0; i < 64; i++) {
3014 get_bits(gb, 8);
3015 }
3016 }
3017
3018 next_start_code_studio(gb);
3019 return 0;
3020 }
3021
extension_and_user_data(MpegEncContext * s,GetBitContext * gb,int id)3022 static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
3023 {
3024 uint32_t startcode;
3025 uint8_t extension_type;
3026
3027 startcode = show_bits_long(gb, 32);
3028 if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
3029
3030 if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
3031 skip_bits_long(gb, 32);
3032 extension_type = get_bits(gb, 4);
3033 if (extension_type == QUANT_MATRIX_EXT_ID)
3034 read_quant_matrix_ext(s, gb);
3035 }
3036 }
3037 }
3038
decode_smpte_tc(Mpeg4DecContext * ctx,GetBitContext * gb)3039 static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
3040 {
3041 MpegEncContext *s = &ctx->m;
3042
3043 skip_bits(gb, 16); /* Time_code[63..48] */
3044 check_marker(s->avctx, gb, "after Time_code[63..48]");
3045 skip_bits(gb, 16); /* Time_code[47..32] */
3046 check_marker(s->avctx, gb, "after Time_code[47..32]");
3047 skip_bits(gb, 16); /* Time_code[31..16] */
3048 check_marker(s->avctx, gb, "after Time_code[31..16]");
3049 skip_bits(gb, 16); /* Time_code[15..0] */
3050 check_marker(s->avctx, gb, "after Time_code[15..0]");
3051 skip_bits(gb, 4); /* reserved_bits */
3052 }
3053
3054 /**
3055 * Decode the next studio vop header.
3056 * @return <0 if something went wrong
3057 */
decode_studio_vop_header(Mpeg4DecContext * ctx,GetBitContext * gb)3058 static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3059 {
3060 MpegEncContext *s = &ctx->m;
3061
3062 if (get_bits_left(gb) <= 32)
3063 return 0;
3064
3065 s->partitioned_frame = 0;
3066 s->interlaced_dct = 0;
3067 s->decode_mb = mpeg4_decode_studio_mb;
3068
3069 decode_smpte_tc(ctx, gb);
3070
3071 skip_bits(gb, 10); /* temporal_reference */
3072 skip_bits(gb, 2); /* vop_structure */
3073 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3074 if (get_bits1(gb)) { /* vop_coded */
3075 skip_bits1(gb); /* top_field_first */
3076 skip_bits1(gb); /* repeat_first_field */
3077 s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3078 }
3079
3080 if (s->pict_type == AV_PICTURE_TYPE_I) {
3081 if (get_bits1(gb))
3082 reset_studio_dc_predictors(s);
3083 }
3084
3085 if (ctx->shape != BIN_ONLY_SHAPE) {
3086 s->alternate_scan = get_bits1(gb);
3087 s->frame_pred_frame_dct = get_bits1(gb);
3088 s->dct_precision = get_bits(gb, 2);
3089 s->intra_dc_precision = get_bits(gb, 2);
3090 s->q_scale_type = get_bits1(gb);
3091 }
3092
3093 if (s->alternate_scan) {
3094 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3095 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3096 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3097 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3098 } else {
3099 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3100 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3101 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3102 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3103 }
3104
3105 mpeg4_load_default_matrices(s);
3106
3107 next_start_code_studio(gb);
3108 extension_and_user_data(s, gb, 4);
3109
3110 return 0;
3111 }
3112
decode_studiovisualobject(Mpeg4DecContext * ctx,GetBitContext * gb)3113 static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
3114 {
3115 MpegEncContext *s = &ctx->m;
3116 int visual_object_type;
3117
3118 skip_bits(gb, 4); /* visual_object_verid */
3119 visual_object_type = get_bits(gb, 4);
3120 if (visual_object_type != VOT_VIDEO_ID) {
3121 avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3122 return AVERROR_PATCHWELCOME;
3123 }
3124
3125 next_start_code_studio(gb);
3126 extension_and_user_data(s, gb, 1);
3127
3128 return 0;
3129 }
3130
decode_studio_vol_header(Mpeg4DecContext * ctx,GetBitContext * gb)3131 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3132 {
3133 MpegEncContext *s = &ctx->m;
3134 int width, height;
3135 int bits_per_raw_sample;
3136
3137 // random_accessible_vol and video_object_type_indication have already
3138 // been read by the caller decode_vol_header()
3139 skip_bits(gb, 4); /* video_object_layer_verid */
3140 ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
3141 skip_bits(gb, 4); /* video_object_layer_shape_extension */
3142 skip_bits1(gb); /* progressive_sequence */
3143 if (ctx->shape != BIN_ONLY_SHAPE) {
3144 ctx->rgb = get_bits1(gb); /* rgb_components */
3145 s->chroma_format = get_bits(gb, 2); /* chroma_format */
3146 if (!s->chroma_format) {
3147 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
3148 return AVERROR_INVALIDDATA;
3149 }
3150
3151 bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
3152 if (bits_per_raw_sample == 10) {
3153 if (ctx->rgb) {
3154 s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
3155 }
3156 else {
3157 s->avctx->pix_fmt = s->chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
3158 }
3159 }
3160 else {
3161 avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
3162 return AVERROR_PATCHWELCOME;
3163 }
3164 s->avctx->bits_per_raw_sample = bits_per_raw_sample;
3165 }
3166 if (ctx->shape == RECT_SHAPE) {
3167 check_marker(s->avctx, gb, "before video_object_layer_width");
3168 width = get_bits(gb, 14); /* video_object_layer_width */
3169 check_marker(s->avctx, gb, "before video_object_layer_height");
3170 height = get_bits(gb, 14); /* video_object_layer_height */
3171 check_marker(s->avctx, gb, "after video_object_layer_height");
3172
3173 /* Do the same check as non-studio profile */
3174 if (width && height) {
3175 if (s->width && s->height &&
3176 (s->width != width || s->height != height))
3177 s->context_reinit = 1;
3178 s->width = width;
3179 s->height = height;
3180 }
3181 }
3182 s->aspect_ratio_info = get_bits(gb, 4);
3183 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
3184 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
3185 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
3186 } else {
3187 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
3188 }
3189 skip_bits(gb, 4); /* frame_rate_code */
3190 skip_bits(gb, 15); /* first_half_bit_rate */
3191 check_marker(s->avctx, gb, "after first_half_bit_rate");
3192 skip_bits(gb, 15); /* latter_half_bit_rate */
3193 check_marker(s->avctx, gb, "after latter_half_bit_rate");
3194 skip_bits(gb, 15); /* first_half_vbv_buffer_size */
3195 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3196 skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
3197 skip_bits(gb, 11); /* first_half_vbv_buffer_size */
3198 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3199 skip_bits(gb, 15); /* latter_half_vbv_occupancy */
3200 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
3201 s->low_delay = get_bits1(gb);
3202 s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
3203
3204 next_start_code_studio(gb);
3205 extension_and_user_data(s, gb, 2);
3206
3207 return 0;
3208 }
3209
3210 /**
3211 * Decode MPEG-4 headers.
3212 * @return <0 if no VOP found (or a damaged one)
3213 * FRAME_SKIPPED if a not coded VOP is found
3214 * 0 if a VOP is found
3215 */
ff_mpeg4_decode_picture_header(Mpeg4DecContext * ctx,GetBitContext * gb)3216 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3217 {
3218 MpegEncContext *s = &ctx->m;
3219 unsigned startcode, v;
3220 int ret;
3221 int vol = 0;
3222
3223 /* search next start code */
3224 align_get_bits(gb);
3225
3226 // If we have not switched to studio profile than we also did not switch bps
3227 // that means something else (like a previous instance) outside set bps which
3228 // would be inconsistant with the currect state, thus reset it
3229 if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3230 s->avctx->bits_per_raw_sample = 0;
3231
3232 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3233 skip_bits(gb, 24);
3234 if (get_bits(gb, 8) == 0xF0)
3235 goto end;
3236 }
3237
3238 startcode = 0xff;
3239 for (;;) {
3240 if (get_bits_count(gb) >= gb->size_in_bits) {
3241 if (gb->size_in_bits == 8 &&
3242 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3243 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3244 return FRAME_SKIPPED; // divx bug
3245 } else
3246 return AVERROR_INVALIDDATA; // end of stream
3247 }
3248
3249 /* use the bits after the test */
3250 v = get_bits(gb, 8);
3251 startcode = ((startcode << 8) | v) & 0xffffffff;
3252
3253 if ((startcode & 0xFFFFFF00) != 0x100)
3254 continue; // no startcode
3255
3256 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3257 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3258 if (startcode <= 0x11F)
3259 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
3260 else if (startcode <= 0x12F)
3261 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
3262 else if (startcode <= 0x13F)
3263 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3264 else if (startcode <= 0x15F)
3265 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
3266 else if (startcode <= 0x1AF)
3267 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3268 else if (startcode == 0x1B0)
3269 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
3270 else if (startcode == 0x1B1)
3271 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
3272 else if (startcode == 0x1B2)
3273 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
3274 else if (startcode == 0x1B3)
3275 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
3276 else if (startcode == 0x1B4)
3277 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
3278 else if (startcode == 0x1B5)
3279 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
3280 else if (startcode == 0x1B6)
3281 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
3282 else if (startcode == 0x1B7)
3283 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
3284 else if (startcode == 0x1B8)
3285 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
3286 else if (startcode == 0x1B9)
3287 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
3288 else if (startcode == 0x1BA)
3289 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
3290 else if (startcode == 0x1BB)
3291 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
3292 else if (startcode == 0x1BC)
3293 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
3294 else if (startcode == 0x1BD)
3295 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
3296 else if (startcode == 0x1BE)
3297 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
3298 else if (startcode == 0x1BF)
3299 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
3300 else if (startcode == 0x1C0)
3301 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
3302 else if (startcode == 0x1C1)
3303 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
3304 else if (startcode == 0x1C2)
3305 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
3306 else if (startcode == 0x1C3)
3307 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
3308 else if (startcode <= 0x1C5)
3309 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
3310 else if (startcode <= 0x1FF)
3311 av_log(s->avctx, AV_LOG_DEBUG, "System start");
3312 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
3313 }
3314
3315 if (startcode >= 0x120 && startcode <= 0x12F) {
3316 if (vol) {
3317 av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3318 continue;
3319 }
3320 vol++;
3321 if ((ret = decode_vol_header(ctx, gb)) < 0)
3322 return ret;
3323 } else if (startcode == USER_DATA_STARTCODE) {
3324 decode_user_data(ctx, gb);
3325 } else if (startcode == GOP_STARTCODE) {
3326 mpeg4_decode_gop_header(s, gb);
3327 } else if (startcode == VOS_STARTCODE) {
3328 int profile, level;
3329 mpeg4_decode_profile_level(s, gb, &profile, &level);
3330 if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
3331 (level > 0 && level < 9)) {
3332 s->studio_profile = 1;
3333 next_start_code_studio(gb);
3334 extension_and_user_data(s, gb, 0);
3335 } else if (s->studio_profile) {
3336 avpriv_request_sample(s->avctx, "Mixes studio and non studio profile\n");
3337 return AVERROR_PATCHWELCOME;
3338 }
3339 s->avctx->profile = profile;
3340 s->avctx->level = level;
3341 } else if (startcode == VISUAL_OBJ_STARTCODE) {
3342 if (s->studio_profile) {
3343 if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3344 return ret;
3345 } else
3346 mpeg4_decode_visual_object(s, gb);
3347 } else if (startcode == VOP_STARTCODE) {
3348 break;
3349 }
3350
3351 align_get_bits(gb);
3352 startcode = 0xff;
3353 }
3354
3355 end:
3356 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3357 s->low_delay = 1;
3358 s->avctx->has_b_frames = !s->low_delay;
3359
3360 if (s->studio_profile) {
3361 if (!s->avctx->bits_per_raw_sample) {
3362 av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3363 return AVERROR_INVALIDDATA;
3364 }
3365 return decode_studio_vop_header(ctx, gb);
3366 } else
3367 return decode_vop_header(ctx, gb);
3368 }
3369
ff_mpeg4videodec_static_init(void)3370 av_cold void ff_mpeg4videodec_static_init(void) {
3371 static int done = 0;
3372
3373 if (!done) {
3374 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
3375 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
3376 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
3377 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
3378 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
3379 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
3380 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3381 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3382 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3383 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3384 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3385 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3386 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
3387 &ff_sprite_trajectory_tab[0][1], 4, 2,
3388 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
3389 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
3390 &ff_mb_type_b_tab[0][1], 2, 1,
3391 &ff_mb_type_b_tab[0][0], 2, 1, 16);
3392 done = 1;
3393 }
3394 }
3395
ff_mpeg4_frame_end(AVCodecContext * avctx,const uint8_t * buf,int buf_size)3396 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3397 {
3398 Mpeg4DecContext *ctx = avctx->priv_data;
3399 MpegEncContext *s = &ctx->m;
3400
3401 /* divx 5.01+ bitstream reorder stuff */
3402 /* Since this clobbers the input buffer and hwaccel codecs still need the
3403 * data during hwaccel->end_frame we should not do this any earlier */
3404 if (s->divx_packed) {
3405 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3406 int startcode_found = 0;
3407
3408 if (buf_size - current_pos > 7) {
3409
3410 int i;
3411 for (i = current_pos; i < buf_size - 4; i++)
3412
3413 if (buf[i] == 0 &&
3414 buf[i + 1] == 0 &&
3415 buf[i + 2] == 1 &&
3416 buf[i + 3] == 0xB6) {
3417 startcode_found = !(buf[i + 4] & 0x40);
3418 break;
3419 }
3420 }
3421
3422 if (startcode_found) {
3423 if (!ctx->showed_packed_warning) {
3424 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3425 "wasteful way to store B-frames ('packed B-frames'). "
3426 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3427 ctx->showed_packed_warning = 1;
3428 }
3429 av_fast_padded_malloc(&s->bitstream_buffer,
3430 &s->allocated_bitstream_buffer_size,
3431 buf_size - current_pos);
3432 if (!s->bitstream_buffer) {
3433 s->bitstream_buffer_size = 0;
3434 return AVERROR(ENOMEM);
3435 }
3436 memcpy(s->bitstream_buffer, buf + current_pos,
3437 buf_size - current_pos);
3438 s->bitstream_buffer_size = buf_size - current_pos;
3439 }
3440 }
3441
3442 return 0;
3443 }
3444
3445 #if HAVE_THREADS
mpeg4_update_thread_context(AVCodecContext * dst,const AVCodecContext * src)3446 static int mpeg4_update_thread_context(AVCodecContext *dst,
3447 const AVCodecContext *src)
3448 {
3449 Mpeg4DecContext *s = dst->priv_data;
3450 const Mpeg4DecContext *s1 = src->priv_data;
3451 int init = s->m.context_initialized;
3452
3453 int ret = ff_mpeg_update_thread_context(dst, src);
3454
3455 if (ret < 0)
3456 return ret;
3457
3458 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
3459
3460 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3461 ff_xvid_idct_init(&s->m.idsp, dst);
3462
3463 return 0;
3464 }
3465 #endif
3466
init_studio_vlcs(Mpeg4DecContext * ctx)3467 static av_cold int init_studio_vlcs(Mpeg4DecContext *ctx)
3468 {
3469 int i, ret;
3470
3471 for (i = 0; i < 12; i++) {
3472 ret = init_vlc(&ctx->studio_intra_tab[i], STUDIO_INTRA_BITS, 22,
3473 &ff_mpeg4_studio_intra[i][0][1], 4, 2,
3474 &ff_mpeg4_studio_intra[i][0][0], 4, 2,
3475 0);
3476
3477 if (ret < 0)
3478 return ret;
3479 }
3480
3481 ret = init_vlc(&ctx->studio_luma_dc, STUDIO_INTRA_BITS, 19,
3482 &ff_mpeg4_studio_dc_luma[0][1], 4, 2,
3483 &ff_mpeg4_studio_dc_luma[0][0], 4, 2,
3484 0);
3485 if (ret < 0)
3486 return ret;
3487
3488 ret = init_vlc(&ctx->studio_chroma_dc, STUDIO_INTRA_BITS, 19,
3489 &ff_mpeg4_studio_dc_chroma[0][1], 4, 2,
3490 &ff_mpeg4_studio_dc_chroma[0][0], 4, 2,
3491 0);
3492 if (ret < 0)
3493 return ret;
3494
3495 return 0;
3496 }
3497
decode_init(AVCodecContext * avctx)3498 static av_cold int decode_init(AVCodecContext *avctx)
3499 {
3500 Mpeg4DecContext *ctx = avctx->priv_data;
3501 MpegEncContext *s = &ctx->m;
3502 int ret;
3503
3504 ctx->divx_version =
3505 ctx->divx_build =
3506 ctx->xvid_build =
3507 ctx->lavc_build = -1;
3508
3509 if ((ret = ff_h263_decode_init(avctx)) < 0)
3510 return ret;
3511
3512 ff_mpeg4videodec_static_init();
3513 if ((ret = init_studio_vlcs(ctx)) < 0)
3514 return ret;
3515
3516 s->h263_pred = 1;
3517 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3518 s->decode_mb = mpeg4_decode_mb;
3519 ctx->time_increment_bits = 4; /* default value for broken headers */
3520
3521 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
3522 avctx->internal->allocate_progress = 1;
3523
3524 return 0;
3525 }
3526
decode_end(AVCodecContext * avctx)3527 static av_cold int decode_end(AVCodecContext *avctx)
3528 {
3529 Mpeg4DecContext *ctx = avctx->priv_data;
3530 int i;
3531
3532 if (!avctx->internal->is_copy) {
3533 for (i = 0; i < 12; i++)
3534 ff_free_vlc(&ctx->studio_intra_tab[i]);
3535
3536 ff_free_vlc(&ctx->studio_luma_dc);
3537 ff_free_vlc(&ctx->studio_chroma_dc);
3538 }
3539
3540 return ff_h263_decode_end(avctx);
3541 }
3542
3543 static const AVOption mpeg4_options[] = {
3544 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3545 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3546 {NULL}
3547 };
3548
3549 static const AVClass mpeg4_class = {
3550 .class_name = "MPEG4 Video Decoder",
3551 .item_name = av_default_item_name,
3552 .option = mpeg4_options,
3553 .version = LIBAVUTIL_VERSION_INT,
3554 };
3555
3556 AVCodec ff_mpeg4_decoder = {
3557 .name = "mpeg4",
3558 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3559 .type = AVMEDIA_TYPE_VIDEO,
3560 .id = AV_CODEC_ID_MPEG4,
3561 .priv_data_size = sizeof(Mpeg4DecContext),
3562 .init = decode_init,
3563 .close = decode_end,
3564 .decode = ff_h263_decode_frame,
3565 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
3566 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
3567 AV_CODEC_CAP_FRAME_THREADS,
3568 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
3569 .flush = ff_mpeg_flush,
3570 .max_lowres = 3,
3571 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
3572 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
3573 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3574 .priv_class = &mpeg4_class,
3575 .hw_configs = (const AVCodecHWConfigInternal*[]) {
3576 #if CONFIG_MPEG4_NVDEC_HWACCEL
3577 HWACCEL_NVDEC(mpeg4),
3578 #endif
3579 #if CONFIG_MPEG4_VAAPI_HWACCEL
3580 HWACCEL_VAAPI(mpeg4),
3581 #endif
3582 #if CONFIG_MPEG4_VDPAU_HWACCEL
3583 HWACCEL_VDPAU(mpeg4),
3584 #endif
3585 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3586 HWACCEL_VIDEOTOOLBOX(mpeg4),
3587 #endif
3588 NULL
3589 },
3590 };
3591