1 /*
2 * RV10/RV20 decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer
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 /**
24 * @file
25 * RV10/RV20 decoder
26 */
27
28 #include <inttypes.h>
29
30 #include "libavutil/imgutils.h"
31 #include "libavutil/thread.h"
32
33 #include "avcodec.h"
34 #include "error_resilience.h"
35 #include "h263.h"
36 #include "h263data.h"
37 #include "internal.h"
38 #include "mpeg_er.h"
39 #include "mpegutils.h"
40 #include "mpegvideo.h"
41 #include "mpeg4video.h"
42 #include "mpegvideodata.h"
43 #include "rv10.h"
44
45 #define RV_GET_MAJOR_VER(x) ((x) >> 28)
46 #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)
47 #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
48
49 #define MAX_VLC_ENTRIES 1023 // Note: Does not include the skip entries.
50 #define DC_VLC_BITS 9
51
52 typedef struct RVDecContext {
53 MpegEncContext m;
54 int sub_id;
55 int orig_width, orig_height;
56 } RVDecContext;
57
58 /* (run, length) encoded value for the symbols table. The actual symbols
59 * are run..run - length (mod 256).
60 * The last two entries in the following table apply to luma only.
61 * The skip values are not included in this list. */
62 static const uint8_t rv_sym_run_len[][2] = {
63 { 0, 0 }, { 1, 0 }, { 255, 0 }, { 3, 1 }, { 254, 1 },
64 { 7, 3 }, { 252, 3 }, { 15, 7 }, { 248, 7 }, { 31, 15 },
65 { 240, 15 }, { 63, 31 }, { 224, 31 }, { 127, 63 }, { 192, 63 },
66 { 255, 127 }, { 128, 127 }, { 127, 255 }, { 128, 255 },
67 };
68
69 /* entry[i] of the following tables gives
70 * the number of VLC codes of length i + 2. */
71 static const uint16_t rv_lum_len_count[15] = {
72 1, 0, 2, 4, 8, 16, 32, 0, 64, 0, 128, 0, 256, 0, 512,
73 };
74
75 static const uint16_t rv_chrom_len_count[15] = {
76 1, 2, 4, 0, 8, 0, 16, 0, 32, 0, 64, 0, 128, 0, 256,
77 };
78
79 static VLC rv_dc_lum, rv_dc_chrom;
80
ff_rv_decode_dc(MpegEncContext * s,int n)81 int ff_rv_decode_dc(MpegEncContext *s, int n)
82 {
83 int code;
84
85 if (n < 4) {
86 code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);
87 } else {
88 code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);
89 if (code < 0) {
90 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
91 return -1;
92 }
93 }
94 return code;
95 }
96
97 /* read RV 1.0 compatible frame header */
rv10_decode_picture_header(MpegEncContext * s)98 static int rv10_decode_picture_header(MpegEncContext *s)
99 {
100 int mb_count, pb_frame, marker, mb_xy;
101
102 marker = get_bits1(&s->gb);
103
104 if (get_bits1(&s->gb))
105 s->pict_type = AV_PICTURE_TYPE_P;
106 else
107 s->pict_type = AV_PICTURE_TYPE_I;
108
109 if (!marker)
110 av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
111
112 pb_frame = get_bits1(&s->gb);
113
114 ff_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);
115
116 if (pb_frame) {
117 avpriv_request_sample(s->avctx, "PB-frame");
118 return AVERROR_PATCHWELCOME;
119 }
120
121 s->qscale = get_bits(&s->gb, 5);
122 if (s->qscale == 0) {
123 av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
124 return AVERROR_INVALIDDATA;
125 }
126
127 if (s->pict_type == AV_PICTURE_TYPE_I) {
128 if (s->rv10_version == 3) {
129 /* specific MPEG like DC coding not used */
130 s->last_dc[0] = get_bits(&s->gb, 8);
131 s->last_dc[1] = get_bits(&s->gb, 8);
132 s->last_dc[2] = get_bits(&s->gb, 8);
133 ff_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],
134 s->last_dc[1], s->last_dc[2]);
135 }
136 }
137 /* if multiple packets per frame are sent, the position at which
138 * to display the macroblocks is coded here */
139
140 mb_xy = s->mb_x + s->mb_y * s->mb_width;
141 if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
142 s->mb_x = get_bits(&s->gb, 6); /* mb_x */
143 s->mb_y = get_bits(&s->gb, 6); /* mb_y */
144 mb_count = get_bits(&s->gb, 12);
145 } else {
146 s->mb_x = 0;
147 s->mb_y = 0;
148 mb_count = s->mb_width * s->mb_height;
149 }
150 skip_bits(&s->gb, 3); /* ignored */
151 s->f_code = 1;
152 s->unrestricted_mv = 1;
153
154 return mb_count;
155 }
156
rv20_decode_picture_header(RVDecContext * rv)157 static int rv20_decode_picture_header(RVDecContext *rv)
158 {
159 MpegEncContext *s = &rv->m;
160 int seq, mb_pos, i, ret;
161 int rpr_max;
162
163 i = get_bits(&s->gb, 2);
164 switch (i) {
165 case 0:
166 s->pict_type = AV_PICTURE_TYPE_I;
167 break;
168 case 1:
169 s->pict_type = AV_PICTURE_TYPE_I;
170 break; // hmm ...
171 case 2:
172 s->pict_type = AV_PICTURE_TYPE_P;
173 break;
174 case 3:
175 s->pict_type = AV_PICTURE_TYPE_B;
176 break;
177 default:
178 av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");
179 return AVERROR_INVALIDDATA;
180 }
181
182 if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {
183 av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
184 return -1;
185 }
186 if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {
187 av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
188 return AVERROR_INVALIDDATA;
189 }
190
191 if (get_bits1(&s->gb)) {
192 av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
193 return AVERROR_INVALIDDATA;
194 }
195
196 s->qscale = get_bits(&s->gb, 5);
197 if (s->qscale == 0) {
198 av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
199 return AVERROR_INVALIDDATA;
200 }
201
202 if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
203 s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;
204
205 if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
206 seq = get_bits(&s->gb, 8) << 7;
207 else
208 seq = get_bits(&s->gb, 13) << 2;
209
210 rpr_max = s->avctx->extradata[1] & 7;
211 if (rpr_max) {
212 int f, new_w, new_h;
213 int rpr_bits = av_log2(rpr_max) + 1;
214
215 f = get_bits(&s->gb, rpr_bits);
216
217 if (f) {
218 if (s->avctx->extradata_size < 8 + 2 * f) {
219 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
220 return AVERROR_INVALIDDATA;
221 }
222
223 new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];
224 new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];
225 } else {
226 new_w = rv->orig_width;
227 new_h = rv->orig_height;
228 }
229 if (new_w != s->width || new_h != s->height || !s->context_initialized) {
230 AVRational old_aspect = s->avctx->sample_aspect_ratio;
231 av_log(s->avctx, AV_LOG_DEBUG,
232 "attempting to change resolution to %dx%d\n", new_w, new_h);
233 if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
234 return AVERROR_INVALIDDATA;
235 ff_mpv_common_end(s);
236
237 // attempt to keep aspect during typical resolution switches
238 if (!old_aspect.num)
239 old_aspect = (AVRational){1, 1};
240 if (2 * (int64_t)new_w * s->height == (int64_t)new_h * s->width)
241 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
242 if ((int64_t)new_w * s->height == 2 * (int64_t)new_h * s->width)
243 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
244
245 ret = ff_set_dimensions(s->avctx, new_w, new_h);
246 if (ret < 0)
247 return ret;
248
249 s->width = new_w;
250 s->height = new_h;
251 if ((ret = ff_mpv_common_init(s)) < 0)
252 return ret;
253 }
254
255 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
256 av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);
257 }
258 }
259 if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
260 return AVERROR_INVALIDDATA;
261
262 mb_pos = ff_h263_decode_mba(s);
263
264 seq |= s->time & ~0x7FFF;
265 if (seq - s->time > 0x4000)
266 seq -= 0x8000;
267 if (seq - s->time < -0x4000)
268 seq += 0x8000;
269
270 if (seq != s->time) {
271 if (s->pict_type != AV_PICTURE_TYPE_B) {
272 s->time = seq;
273 s->pp_time = s->time - s->last_non_b_time;
274 s->last_non_b_time = s->time;
275 } else {
276 s->time = seq;
277 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
278 }
279 }
280 if (s->pict_type == AV_PICTURE_TYPE_B) {
281 if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
282 av_log(s->avctx, AV_LOG_DEBUG,
283 "messed up order, possible from seeking? skipping current B-frame\n");
284 #define ERROR_SKIP_FRAME -123
285 return ERROR_SKIP_FRAME;
286 }
287 ff_mpeg4_init_direct_mv(s);
288 }
289
290 s->no_rounding = get_bits1(&s->gb);
291
292 if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)
293 // binary decoder reads 3+2 bits here but they don't seem to be used
294 skip_bits(&s->gb, 5);
295
296 s->f_code = 1;
297 s->unrestricted_mv = 1;
298 s->h263_aic = s->pict_type == AV_PICTURE_TYPE_I;
299 s->modified_quant = 1;
300 if (!s->avctx->lowres)
301 s->loop_filter = 1;
302
303 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
304 av_log(s->avctx, AV_LOG_INFO,
305 "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
306 seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,
307 s->no_rounding);
308 }
309
310 av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
311
312 return s->mb_width * s->mb_height - mb_pos;
313 }
314
rv10_build_vlc(VLC * vlc,const uint16_t len_count[15],const uint8_t sym_rl[][2],int sym_rl_elems)315 static av_cold void rv10_build_vlc(VLC *vlc, const uint16_t len_count[15],
316 const uint8_t sym_rl[][2], int sym_rl_elems)
317 {
318 uint16_t syms[MAX_VLC_ENTRIES];
319 uint8_t lens[MAX_VLC_ENTRIES];
320 unsigned nb_syms = 0, nb_lens = 0;
321
322 for (unsigned i = 0; i < sym_rl_elems; i++) {
323 unsigned cur_sym = sym_rl[i][0];
324 for (unsigned tmp = nb_syms + sym_rl[i][1]; nb_syms <= tmp; nb_syms++)
325 syms[nb_syms] = 0xFF & cur_sym--;
326 }
327
328 for (unsigned i = 0; i < 15; i++)
329 for (unsigned tmp = nb_lens + len_count[i]; nb_lens < tmp; nb_lens++)
330 lens[nb_lens] = i + 2;
331 av_assert1(nb_lens == nb_syms);
332 ff_init_vlc_from_lengths(vlc, DC_VLC_BITS, nb_lens, lens, 1,
333 syms, 2, 2, 0, INIT_VLC_STATIC_OVERLONG, NULL);
334 }
335
rv10_init_static(void)336 static av_cold void rv10_init_static(void)
337 {
338 static VLC_TYPE table[1472 + 992][2];
339
340 rv_dc_lum.table = table;
341 rv_dc_lum.table_allocated = 1472;
342 rv10_build_vlc(&rv_dc_lum, rv_lum_len_count,
343 rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len));
344 for (int i = 0; i < 1 << (DC_VLC_BITS - 7 /* Length of skip prefix */); i++) {
345 /* All codes beginning with 0x7F have the same length and value.
346 * Modifying the table directly saves us the useless subtables. */
347 rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i][0] = 255;
348 rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i][1] = 18;
349 }
350 rv_dc_chrom.table = &table[1472];
351 rv_dc_chrom.table_allocated = 992;
352 rv10_build_vlc(&rv_dc_chrom, rv_chrom_len_count,
353 rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len) - 2);
354 for (int i = 0; i < 1 << (DC_VLC_BITS - 9 /* Length of skip prefix */); i++) {
355 /* Same as above. */
356 rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i][0] = 255;
357 rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i][1] = 18;
358 }
359 ff_h263_decode_init_vlc();
360 }
361
rv10_decode_init(AVCodecContext * avctx)362 static av_cold int rv10_decode_init(AVCodecContext *avctx)
363 {
364 static AVOnce init_static_once = AV_ONCE_INIT;
365 RVDecContext *rv = avctx->priv_data;
366 MpegEncContext *s = &rv->m;
367 int major_ver, minor_ver, micro_ver, ret;
368
369 if (avctx->extradata_size < 8) {
370 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
371 return AVERROR_INVALIDDATA;
372 }
373 if ((ret = av_image_check_size(avctx->coded_width,
374 avctx->coded_height, 0, avctx)) < 0)
375 return ret;
376
377 ff_mpv_decode_init(s, avctx);
378
379 s->out_format = FMT_H263;
380
381 rv->orig_width =
382 s->width = avctx->coded_width;
383 rv->orig_height =
384 s->height = avctx->coded_height;
385
386 s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;
387 rv->sub_id = AV_RB32((uint8_t *) avctx->extradata + 4);
388
389 major_ver = RV_GET_MAJOR_VER(rv->sub_id);
390 minor_ver = RV_GET_MINOR_VER(rv->sub_id);
391 micro_ver = RV_GET_MICRO_VER(rv->sub_id);
392
393 s->low_delay = 1;
394 switch (major_ver) {
395 case 1:
396 s->rv10_version = micro_ver ? 3 : 1;
397 s->obmc = micro_ver == 2;
398 break;
399 case 2:
400 if (minor_ver >= 2) {
401 s->low_delay = 0;
402 s->avctx->has_b_frames = 1;
403 }
404 break;
405 default:
406 av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
407 avpriv_request_sample(avctx, "RV1/2 version");
408 return AVERROR_PATCHWELCOME;
409 }
410
411 if (avctx->debug & FF_DEBUG_PICT_INFO) {
412 av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,
413 ((uint32_t *) avctx->extradata)[0]);
414 }
415
416 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
417
418 ff_mpv_idct_init(s);
419 if ((ret = ff_mpv_common_init(s)) < 0)
420 return ret;
421
422 ff_h263dsp_init(&s->h263dsp);
423
424 /* init static VLCs */
425 ff_thread_once(&init_static_once, rv10_init_static);
426
427 return 0;
428 }
429
rv10_decode_end(AVCodecContext * avctx)430 static av_cold int rv10_decode_end(AVCodecContext *avctx)
431 {
432 MpegEncContext *s = avctx->priv_data;
433
434 ff_mpv_common_end(s);
435 return 0;
436 }
437
rv10_decode_packet(AVCodecContext * avctx,const uint8_t * buf,int buf_size,int buf_size2,int whole_size)438 static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
439 int buf_size, int buf_size2, int whole_size)
440 {
441 RVDecContext *rv = avctx->priv_data;
442 MpegEncContext *s = &rv->m;
443 int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
444
445 active_bits_size = buf_size * 8;
446 init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
447 if (s->codec_id == AV_CODEC_ID_RV10)
448 mb_count = rv10_decode_picture_header(s);
449 else
450 mb_count = rv20_decode_picture_header(rv);
451 if (mb_count < 0) {
452 if (mb_count != ERROR_SKIP_FRAME)
453 av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
454 return AVERROR_INVALIDDATA;
455 }
456
457 if (s->mb_x >= s->mb_width ||
458 s->mb_y >= s->mb_height) {
459 av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
460 return AVERROR_INVALIDDATA;
461 }
462 mb_pos = s->mb_y * s->mb_width + s->mb_x;
463 left = s->mb_width * s->mb_height - mb_pos;
464 if (mb_count > left) {
465 av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
466 return AVERROR_INVALIDDATA;
467 }
468
469 if (whole_size < s->mb_width * s->mb_height / 8)
470 return AVERROR_INVALIDDATA;
471
472 if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {
473 // FIXME write parser so we always have complete frames?
474 if (s->current_picture_ptr) {
475 ff_er_frame_end(&s->er);
476 ff_mpv_frame_end(s);
477 s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
478 }
479 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
480 return ret;
481 ff_mpeg_er_frame_start(s);
482 } else {
483 if (s->current_picture_ptr->f->pict_type != s->pict_type) {
484 av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
485 return AVERROR_INVALIDDATA;
486 }
487 }
488
489
490 ff_dlog(avctx, "qscale=%d\n", s->qscale);
491
492 /* default quantization values */
493 if (s->codec_id == AV_CODEC_ID_RV10) {
494 if (s->mb_y == 0)
495 s->first_slice_line = 1;
496 } else {
497 s->first_slice_line = 1;
498 s->resync_mb_x = s->mb_x;
499 }
500 start_mb_x = s->mb_x;
501 s->resync_mb_y = s->mb_y;
502 if (s->h263_aic) {
503 s->y_dc_scale_table =
504 s->c_dc_scale_table = ff_aic_dc_scale_table;
505 } else {
506 s->y_dc_scale_table =
507 s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
508 }
509
510 if (s->modified_quant)
511 s->chroma_qscale_table = ff_h263_chroma_qscale_table;
512
513 ff_set_qscale(s, s->qscale);
514
515 s->rv10_first_dc_coded[0] = 0;
516 s->rv10_first_dc_coded[1] = 0;
517 s->rv10_first_dc_coded[2] = 0;
518 s->block_wrap[0] =
519 s->block_wrap[1] =
520 s->block_wrap[2] =
521 s->block_wrap[3] = s->b8_stride;
522 s->block_wrap[4] =
523 s->block_wrap[5] = s->mb_stride;
524 ff_init_block_index(s);
525
526 /* decode each macroblock */
527 for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
528 int ret;
529 ff_update_block_index(s);
530 ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
531
532 s->mv_dir = MV_DIR_FORWARD;
533 s->mv_type = MV_TYPE_16X16;
534 ret = ff_h263_decode_mb(s, s->block);
535
536 // Repeat the slice end check from ff_h263_decode_mb with our active
537 // bitstream size
538 if (ret != SLICE_ERROR && active_bits_size >= get_bits_count(&s->gb)) {
539 int v = show_bits(&s->gb, 16);
540
541 if (get_bits_count(&s->gb) + 16 > active_bits_size)
542 v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
543
544 if (!v)
545 ret = SLICE_END;
546 }
547 if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
548 8 * buf_size2 >= get_bits_count(&s->gb)) {
549 active_bits_size = buf_size2 * 8;
550 av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
551 8 * buf_size, active_bits_size);
552 ret = SLICE_OK;
553 }
554
555 if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
556 av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,
557 s->mb_y);
558 return AVERROR_INVALIDDATA;
559 }
560 if (s->pict_type != AV_PICTURE_TYPE_B)
561 ff_h263_update_motion_val(s);
562 ff_mpv_reconstruct_mb(s, s->block);
563 if (s->loop_filter)
564 ff_h263_loop_filter(s);
565
566 if (++s->mb_x == s->mb_width) {
567 s->mb_x = 0;
568 s->mb_y++;
569 ff_init_block_index(s);
570 }
571 if (s->mb_x == s->resync_mb_x)
572 s->first_slice_line = 0;
573 if (ret == SLICE_END)
574 break;
575 }
576
577 ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,
578 ER_MB_END);
579
580 return active_bits_size;
581 }
582
get_slice_offset(AVCodecContext * avctx,const uint8_t * buf,int n)583 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
584 {
585 if (avctx->slice_count)
586 return avctx->slice_offset[n];
587 else
588 return AV_RL32(buf + n * 8);
589 }
590
rv10_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)591 static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
592 AVPacket *avpkt)
593 {
594 const uint8_t *buf = avpkt->data;
595 int buf_size = avpkt->size;
596 MpegEncContext *s = avctx->priv_data;
597 AVFrame *pict = data;
598 int i, ret;
599 int slice_count;
600 const uint8_t *slices_hdr = NULL;
601
602 ff_dlog(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
603
604 /* no supplementary picture */
605 if (buf_size == 0) {
606 return 0;
607 }
608
609 if (!avctx->slice_count) {
610 slice_count = (*buf++) + 1;
611 buf_size--;
612
613 if (!slice_count || buf_size <= 8 * slice_count) {
614 av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",
615 slice_count);
616 return AVERROR_INVALIDDATA;
617 }
618
619 slices_hdr = buf + 4;
620 buf += 8 * slice_count;
621 buf_size -= 8 * slice_count;
622 } else
623 slice_count = avctx->slice_count;
624
625 for (i = 0; i < slice_count; i++) {
626 unsigned offset = get_slice_offset(avctx, slices_hdr, i);
627 int size, size2;
628
629 if (offset >= buf_size)
630 return AVERROR_INVALIDDATA;
631
632 if (i + 1 == slice_count)
633 size = buf_size - offset;
634 else
635 size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
636
637 if (i + 2 >= slice_count)
638 size2 = buf_size - offset;
639 else
640 size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
641
642 if (size <= 0 || size2 <= 0 ||
643 offset + FFMAX(size, size2) > buf_size)
644 return AVERROR_INVALIDDATA;
645
646 if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2, buf_size)) < 0)
647 return ret;
648
649 if (ret > 8 * size)
650 i++;
651 }
652
653 if (s->current_picture_ptr && s->mb_y >= s->mb_height) {
654 ff_er_frame_end(&s->er);
655 ff_mpv_frame_end(s);
656
657 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
658 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
659 return ret;
660 ff_print_debug_info(s, s->current_picture_ptr, pict);
661 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
662 } else if (s->last_picture_ptr) {
663 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
664 return ret;
665 ff_print_debug_info(s, s->last_picture_ptr, pict);
666 ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
667 }
668
669 if (s->last_picture_ptr || s->low_delay) {
670 *got_frame = 1;
671 }
672
673 // so we can detect if frame_end was not called (find some nicer solution...)
674 s->current_picture_ptr = NULL;
675 }
676
677 return avpkt->size;
678 }
679
680 AVCodec ff_rv10_decoder = {
681 .name = "rv10",
682 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),
683 .type = AVMEDIA_TYPE_VIDEO,
684 .id = AV_CODEC_ID_RV10,
685 .priv_data_size = sizeof(RVDecContext),
686 .init = rv10_decode_init,
687 .close = rv10_decode_end,
688 .decode = rv10_decode_frame,
689 .capabilities = AV_CODEC_CAP_DR1,
690 .max_lowres = 3,
691 .pix_fmts = (const enum AVPixelFormat[]) {
692 AV_PIX_FMT_YUV420P,
693 AV_PIX_FMT_NONE
694 },
695 };
696
697 AVCodec ff_rv20_decoder = {
698 .name = "rv20",
699 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),
700 .type = AVMEDIA_TYPE_VIDEO,
701 .id = AV_CODEC_ID_RV20,
702 .priv_data_size = sizeof(RVDecContext),
703 .init = rv10_decode_init,
704 .close = rv10_decode_end,
705 .decode = rv10_decode_frame,
706 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
707 .flush = ff_mpeg_flush,
708 .max_lowres = 3,
709 .pix_fmts = (const enum AVPixelFormat[]) {
710 AV_PIX_FMT_YUV420P,
711 AV_PIX_FMT_NONE
712 },
713 };
714