1 /*
2 * H.263 decoder
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 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 /**
24 * @file
25 * H.263 decoder.
26 */
27
28 #define UNCHECKED_BITSTREAM_READER 1
29
30 #include "libavutil/cpu.h"
31 #include "avcodec.h"
32 #include "error_resilience.h"
33 #include "flv.h"
34 #include "h263.h"
35 #include "h263_parser.h"
36 #include "internal.h"
37 #include "mpeg_er.h"
38 #include "mpeg4video.h"
39 #include "mpeg4video_parser.h"
40 #include "mpegvideo.h"
41 #include "msmpeg4.h"
42 #include "qpeldsp.h"
43 #include "vdpau_internal.h"
44 #include "thread.h"
45
ff_h263_decode_init(AVCodecContext * avctx)46 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
47 {
48 MpegEncContext *s = avctx->priv_data;
49 int ret;
50
51 s->out_format = FMT_H263;
52
53 // set defaults
54 ff_mpv_decode_defaults(s);
55 ff_mpv_decode_init(s, avctx);
56
57 s->quant_precision = 5;
58 s->decode_mb = ff_h263_decode_mb;
59 s->low_delay = 1;
60 if (avctx->codec->id == AV_CODEC_ID_MSS2)
61 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
62 else
63 avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
64 s->unrestricted_mv = 1;
65
66 /* select sub codec */
67 switch (avctx->codec->id) {
68 case AV_CODEC_ID_H263:
69 case AV_CODEC_ID_H263P:
70 s->unrestricted_mv = 0;
71 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
72 break;
73 case AV_CODEC_ID_MPEG4:
74 break;
75 case AV_CODEC_ID_MSMPEG4V1:
76 s->h263_pred = 1;
77 s->msmpeg4_version = 1;
78 break;
79 case AV_CODEC_ID_MSMPEG4V2:
80 s->h263_pred = 1;
81 s->msmpeg4_version = 2;
82 break;
83 case AV_CODEC_ID_MSMPEG4V3:
84 s->h263_pred = 1;
85 s->msmpeg4_version = 3;
86 break;
87 case AV_CODEC_ID_WMV1:
88 s->h263_pred = 1;
89 s->msmpeg4_version = 4;
90 break;
91 case AV_CODEC_ID_WMV2:
92 s->h263_pred = 1;
93 s->msmpeg4_version = 5;
94 break;
95 case AV_CODEC_ID_VC1:
96 case AV_CODEC_ID_WMV3:
97 case AV_CODEC_ID_VC1IMAGE:
98 case AV_CODEC_ID_WMV3IMAGE:
99 case AV_CODEC_ID_MSS2:
100 s->h263_pred = 1;
101 s->msmpeg4_version = 6;
102 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
103 break;
104 case AV_CODEC_ID_H263I:
105 break;
106 case AV_CODEC_ID_FLV1:
107 s->h263_flv = 1;
108 break;
109 default:
110 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
111 avctx->codec->id);
112 return AVERROR(ENOSYS);
113 }
114 s->codec_id = avctx->codec->id;
115
116 if (avctx->stream_codec_tag == AV_RL32("l263") && avctx->extradata_size == 56 && avctx->extradata[0] == 1)
117 s->ehc_mode = 1;
118
119 /* for h263, we allocate the images after having read the header */
120 if (avctx->codec->id != AV_CODEC_ID_H263 &&
121 avctx->codec->id != AV_CODEC_ID_H263P &&
122 avctx->codec->id != AV_CODEC_ID_MPEG4) {
123 ff_mpv_idct_init(s);
124 if ((ret = ff_mpv_common_init(s)) < 0)
125 return ret;
126 }
127
128 ff_h263dsp_init(&s->h263dsp);
129 ff_qpeldsp_init(&s->qdsp);
130 ff_h263_decode_init_vlc();
131
132 return 0;
133 }
134
ff_h263_decode_end(AVCodecContext * avctx)135 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
136 {
137 MpegEncContext *s = avctx->priv_data;
138
139 ff_mpv_common_end(s);
140 return 0;
141 }
142
143 /**
144 * Return the number of bytes consumed for building the current frame.
145 */
get_consumed_bytes(MpegEncContext * s,int buf_size)146 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
147 {
148 int pos = (get_bits_count(&s->gb) + 7) >> 3;
149
150 if (s->divx_packed || s->avctx->hwaccel) {
151 /* We would have to scan through the whole buf to handle the weird
152 * reordering ... */
153 return buf_size;
154 } else if (s->flags & CODEC_FLAG_TRUNCATED) {
155 pos -= s->parse_context.last_index;
156 // padding is not really read so this might be -1
157 if (pos < 0)
158 pos = 0;
159 return pos;
160 } else {
161 // avoid infinite loops (maybe not needed...)
162 if (pos == 0)
163 pos = 1;
164 // oops ;)
165 if (pos + 10 > buf_size)
166 pos = buf_size;
167
168 return pos;
169 }
170 }
171
decode_slice(MpegEncContext * s)172 static int decode_slice(MpegEncContext *s)
173 {
174 const int part_mask = s->partitioned_frame
175 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
176 const int mb_size = 16 >> s->avctx->lowres;
177 int ret;
178
179 s->last_resync_gb = s->gb;
180 s->first_slice_line = 1;
181 s->resync_mb_x = s->mb_x;
182 s->resync_mb_y = s->mb_y;
183
184 ff_set_qscale(s, s->qscale);
185
186 if (s->avctx->hwaccel) {
187 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
188 ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
189 // ensure we exit decode loop
190 s->mb_y = s->mb_height;
191 return ret;
192 }
193
194 if (s->partitioned_frame) {
195 const int qscale = s->qscale;
196
197 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
198 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
199 return ret;
200
201 /* restore variables which were modified */
202 s->first_slice_line = 1;
203 s->mb_x = s->resync_mb_x;
204 s->mb_y = s->resync_mb_y;
205 ff_set_qscale(s, qscale);
206 }
207
208 for (; s->mb_y < s->mb_height; s->mb_y++) {
209 /* per-row end of slice checks */
210 if (s->msmpeg4_version) {
211 if (s->resync_mb_y + s->slice_height == s->mb_y) {
212 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
213 s->mb_x - 1, s->mb_y, ER_MB_END);
214
215 return 0;
216 }
217 }
218
219 if (s->msmpeg4_version == 1) {
220 s->last_dc[0] =
221 s->last_dc[1] =
222 s->last_dc[2] = 128;
223 }
224
225 ff_init_block_index(s);
226 for (; s->mb_x < s->mb_width; s->mb_x++) {
227 int ret;
228
229 ff_update_block_index(s);
230
231 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
232 s->first_slice_line = 0;
233
234 /* DCT & quantize */
235
236 s->mv_dir = MV_DIR_FORWARD;
237 s->mv_type = MV_TYPE_16X16;
238 av_dlog(s, "%d %d %06X\n",
239 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
240
241 tprintf(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
242 ret = s->decode_mb(s, s->block);
243
244 if (s->pict_type != AV_PICTURE_TYPE_B)
245 ff_h263_update_motion_val(s);
246
247 if (ret < 0) {
248 const int xy = s->mb_x + s->mb_y * s->mb_stride;
249 if (ret == SLICE_END) {
250 ff_mpv_decode_mb(s, s->block);
251 if (s->loop_filter)
252 ff_h263_loop_filter(s);
253
254 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
255 s->mb_x, s->mb_y, ER_MB_END & part_mask);
256
257 s->padding_bug_score--;
258
259 if (++s->mb_x >= s->mb_width) {
260 s->mb_x = 0;
261 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
262 ff_mpv_report_decode_progress(s);
263 s->mb_y++;
264 }
265 return 0;
266 } else if (ret == SLICE_NOEND) {
267 av_log(s->avctx, AV_LOG_ERROR,
268 "Slice mismatch at MB: %d\n", xy);
269 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
270 s->mb_x + 1, s->mb_y,
271 ER_MB_END & part_mask);
272 return AVERROR_INVALIDDATA;
273 }
274 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
275 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
276 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
277
278 if (s->err_recognition & AV_EF_IGNORE_ERR)
279 continue;
280 return AVERROR_INVALIDDATA;
281 }
282
283 ff_mpv_decode_mb(s, s->block);
284 if (s->loop_filter)
285 ff_h263_loop_filter(s);
286 }
287
288 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
289 ff_mpv_report_decode_progress(s);
290
291 s->mb_x = 0;
292 }
293
294 av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
295
296 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
297 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
298 get_bits_left(&s->gb) >= 48 &&
299 show_bits(&s->gb, 24) == 0x4010 &&
300 !s->data_partitioning)
301 s->padding_bug_score += 32;
302
303 /* try to detect the padding bug */
304 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
305 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
306 get_bits_left(&s->gb) >= 0 &&
307 get_bits_left(&s->gb) < 137 &&
308 !s->data_partitioning) {
309 const int bits_count = get_bits_count(&s->gb);
310 const int bits_left = s->gb.size_in_bits - bits_count;
311
312 if (bits_left == 0) {
313 s->padding_bug_score += 16;
314 } else if (bits_left != 1) {
315 int v = show_bits(&s->gb, 8);
316 v |= 0x7F >> (7 - (bits_count & 7));
317
318 if (v == 0x7F && bits_left <= 8)
319 s->padding_bug_score--;
320 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
321 bits_left <= 16)
322 s->padding_bug_score += 4;
323 else
324 s->padding_bug_score++;
325 }
326 }
327
328 if (s->codec_id == AV_CODEC_ID_H263 &&
329 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
330 get_bits_left(&s->gb) >= 8 &&
331 get_bits_left(&s->gb) < 300 &&
332 s->pict_type == AV_PICTURE_TYPE_I &&
333 show_bits(&s->gb, 8) == 0 &&
334 !s->data_partitioning) {
335
336 s->padding_bug_score += 32;
337 }
338
339 if (s->codec_id == AV_CODEC_ID_H263 &&
340 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
341 get_bits_left(&s->gb) >= 64 &&
342 AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
343
344 s->padding_bug_score += 32;
345 }
346
347 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
348 if (s->padding_bug_score > -2 && !s->data_partitioning)
349 s->workaround_bugs |= FF_BUG_NO_PADDING;
350 else
351 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
352 }
353
354 // handle formats which don't have unique end markers
355 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
356 int left = get_bits_left(&s->gb);
357 int max_extra = 7;
358
359 /* no markers in M$ crap */
360 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
361 max_extra += 17;
362
363 /* buggy padding but the frame should still end approximately at
364 * the bitstream end */
365 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
366 (s->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
367 max_extra += 48;
368 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
369 max_extra += 256 * 256 * 256 * 64;
370
371 if (left > max_extra)
372 av_log(s->avctx, AV_LOG_ERROR,
373 "discarding %d junk bits at end, next would be %X\n",
374 left, show_bits(&s->gb, 24));
375 else if (left < 0)
376 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
377 else
378 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
379 s->mb_x - 1, s->mb_y, ER_MB_END);
380
381 return 0;
382 }
383
384 av_log(s->avctx, AV_LOG_ERROR,
385 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
386 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
387
388 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
389 ER_MB_END & part_mask);
390
391 return AVERROR_INVALIDDATA;
392 }
393
ff_h263_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)394 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
395 AVPacket *avpkt)
396 {
397 const uint8_t *buf = avpkt->data;
398 int buf_size = avpkt->size;
399 MpegEncContext *s = avctx->priv_data;
400 int ret;
401 int slice_ret = 0;
402 AVFrame *pict = data;
403
404 s->flags = avctx->flags;
405 s->flags2 = avctx->flags2;
406
407 /* no supplementary picture */
408 if (buf_size == 0) {
409 /* special case for last picture */
410 if (s->low_delay == 0 && s->next_picture_ptr) {
411 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
412 return ret;
413 s->next_picture_ptr = NULL;
414
415 *got_frame = 1;
416 }
417
418 return 0;
419 }
420
421 if (s->flags & CODEC_FLAG_TRUNCATED) {
422 int next;
423
424 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
425 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
426 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
427 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
428 } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
429 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
430 } else {
431 av_log(s->avctx, AV_LOG_ERROR,
432 "this codec does not support truncated bitstreams\n");
433 return AVERROR(ENOSYS);
434 }
435
436 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
437 &buf_size) < 0)
438 return buf_size;
439 }
440
441 retry:
442 if (s->divx_packed && s->bitstream_buffer_size) {
443 int i;
444 for(i=0; i < buf_size-3; i++) {
445 if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
446 if (buf[i+3]==0xB0) {
447 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
448 s->bitstream_buffer_size = 0;
449 }
450 break;
451 }
452 }
453 }
454
455 if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
456 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
457 s->bitstream_buffer_size);
458 else
459 ret = init_get_bits8(&s->gb, buf, buf_size);
460
461 s->bitstream_buffer_size = 0;
462 if (ret < 0)
463 return ret;
464
465 if (!s->context_initialized)
466 // we need the idct permutaton for reading a custom matrix
467 ff_mpv_idct_init(s);
468
469 /* let's go :-) */
470 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
471 ret = ff_wmv2_decode_picture_header(s);
472 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
473 ret = ff_msmpeg4_decode_picture_header(s);
474 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
475 if (s->avctx->extradata_size && s->picture_number == 0) {
476 GetBitContext gb;
477
478 if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
479 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb);
480 }
481 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
482 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
483 ret = ff_intel_h263_decode_picture_header(s);
484 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
485 ret = ff_flv_decode_picture_header(s);
486 } else {
487 ret = ff_h263_decode_picture_header(s);
488 }
489
490 if (ret < 0 || ret == FRAME_SKIPPED) {
491 if ( s->width != avctx->coded_width
492 || s->height != avctx->coded_height) {
493 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
494 s->width = avctx->coded_width;
495 s->height= avctx->coded_height;
496 }
497 }
498 if (ret == FRAME_SKIPPED)
499 return get_consumed_bytes(s, buf_size);
500
501 /* skip if the header was thrashed */
502 if (ret < 0) {
503 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
504 return ret;
505 }
506
507 if (!s->context_initialized)
508 if ((ret = ff_mpv_common_init(s)) < 0)
509 return ret;
510
511 if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
512 int i = ff_find_unused_picture(s, 0);
513 if (i < 0)
514 return i;
515 s->current_picture_ptr = &s->picture[i];
516 }
517
518 avctx->has_b_frames = !s->low_delay;
519
520 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
521 if (ff_mpeg4_workaround_bugs(avctx) == 1)
522 goto retry;
523 }
524
525 /* After H263 & mpeg4 header decode we have the height, width,
526 * and other parameters. So then we could init the picture.
527 * FIXME: By the way H263 decoder is evolving it should have
528 * an H263EncContext */
529 if (s->width != avctx->coded_width ||
530 s->height != avctx->coded_height ||
531 s->context_reinit) {
532 /* H.263 could change picture size any time */
533 s->context_reinit = 0;
534
535 ret = ff_set_dimensions(avctx, s->width, s->height);
536 if (ret < 0)
537 return ret;
538
539 ff_set_sar(avctx, avctx->sample_aspect_ratio);
540
541 if ((ret = ff_mpv_common_frame_size_change(s)))
542 return ret;
543 }
544
545 if (s->codec_id == AV_CODEC_ID_H263 ||
546 s->codec_id == AV_CODEC_ID_H263P ||
547 s->codec_id == AV_CODEC_ID_H263I)
548 s->gob_index = ff_h263_get_gob_height(s);
549
550 // for skipping the frame
551 s->current_picture.f->pict_type = s->pict_type;
552 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
553
554 /* skip B-frames if we don't have reference frames */
555 if (!s->last_picture_ptr &&
556 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
557 return get_consumed_bytes(s, buf_size);
558 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
559 s->pict_type == AV_PICTURE_TYPE_B) ||
560 (avctx->skip_frame >= AVDISCARD_NONKEY &&
561 s->pict_type != AV_PICTURE_TYPE_I) ||
562 avctx->skip_frame >= AVDISCARD_ALL)
563 return get_consumed_bytes(s, buf_size);
564
565 if (s->next_p_frame_damaged) {
566 if (s->pict_type == AV_PICTURE_TYPE_B)
567 return get_consumed_bytes(s, buf_size);
568 else
569 s->next_p_frame_damaged = 0;
570 }
571
572 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
573 s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
574 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
575 } else {
576 s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
577 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
578 }
579
580 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
581 return ret;
582
583 if (!s->divx_packed && !avctx->hwaccel)
584 ff_thread_finish_setup(avctx);
585
586 #if (CONFIG_MPEG4_VDPAU_DECODER == 1)
587 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
588 ff_vdpau_mpeg4_decode_picture(avctx->priv_data, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
589 goto frame_end;
590 }
591 #endif
592
593 if (avctx->hwaccel) {
594 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
595 s->gb.buffer_end - s->gb.buffer);
596 if (ret < 0 )
597 return ret;
598 }
599
600 ff_mpeg_er_frame_start(s);
601
602 /* the second part of the wmv2 header contains the MB skip bits which
603 * are stored in current_picture->mb_type which is not available before
604 * ff_mpv_frame_start() */
605 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
606 ret = ff_wmv2_decode_secondary_picture_header(s);
607 if (ret < 0)
608 return ret;
609 if (ret == 1)
610 goto frame_end;
611 }
612
613 /* decode each macroblock */
614 s->mb_x = 0;
615 s->mb_y = 0;
616
617 slice_ret = decode_slice(s);
618 while (s->mb_y < s->mb_height) {
619 if (s->msmpeg4_version) {
620 if (s->slice_height == 0 || s->mb_x != 0 ||
621 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
622 break;
623 } else {
624 int prev_x = s->mb_x, prev_y = s->mb_y;
625 if (ff_h263_resync(s) < 0)
626 break;
627 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
628 s->er.error_occurred = 1;
629 }
630
631 if (s->msmpeg4_version < 4 && s->h263_pred)
632 ff_mpeg4_clean_buffers(s);
633
634 if (decode_slice(s) < 0)
635 slice_ret = AVERROR_INVALIDDATA;
636 }
637
638 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
639 s->pict_type == AV_PICTURE_TYPE_I)
640 if (!CONFIG_MSMPEG4_DECODER ||
641 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
642 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
643
644 av_assert1(s->bitstream_buffer_size == 0);
645 frame_end:
646 ff_er_frame_end(&s->er);
647
648 if (avctx->hwaccel) {
649 ret = avctx->hwaccel->end_frame(avctx);
650 if (ret < 0)
651 return ret;
652 }
653
654 ff_mpv_frame_end(s);
655
656 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
657 ff_mpeg4_frame_end(avctx, buf, buf_size);
658
659 if (!s->divx_packed && avctx->hwaccel)
660 ff_thread_finish_setup(avctx);
661
662 av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type);
663 av_assert1(s->current_picture.f->pict_type == s->pict_type);
664 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
665 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
666 return ret;
667 ff_print_debug_info(s, s->current_picture_ptr, pict);
668 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
669 } else if (s->last_picture_ptr) {
670 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
671 return ret;
672 ff_print_debug_info(s, s->last_picture_ptr, pict);
673 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
674 }
675
676 if (s->last_picture_ptr || s->low_delay) {
677 if ( pict->format == AV_PIX_FMT_YUV420P
678 && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
679 int x, y, p;
680 av_frame_make_writable(pict);
681 for (p=0; p<3; p++) {
682 int w = FF_CEIL_RSHIFT(pict-> width, !!p);
683 int h = FF_CEIL_RSHIFT(pict->height, !!p);
684 int linesize = pict->linesize[p];
685 for (y=0; y<(h>>1); y++)
686 for (x=0; x<w; x++)
687 FFSWAP(int,
688 pict->data[p][x + y*linesize],
689 pict->data[p][x + (h-1-y)*linesize]);
690 }
691 }
692 *got_frame = 1;
693 }
694
695 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
696 return ret;
697 else
698 return get_consumed_bytes(s, buf_size);
699 }
700
701 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
702 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
703 AV_PIX_FMT_VAAPI_VLD,
704 #endif
705 #if CONFIG_H263_VDPAU_HWACCEL || CONFIG_MPEG4_VDPAU_HWACCEL
706 AV_PIX_FMT_VDPAU,
707 #endif
708 AV_PIX_FMT_YUV420P,
709 AV_PIX_FMT_NONE
710 };
711
712 AVCodec ff_h263_decoder = {
713 .name = "h263",
714 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
715 .type = AVMEDIA_TYPE_VIDEO,
716 .id = AV_CODEC_ID_H263,
717 .priv_data_size = sizeof(MpegEncContext),
718 .init = ff_h263_decode_init,
719 .close = ff_h263_decode_end,
720 .decode = ff_h263_decode_frame,
721 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
722 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
723 .flush = ff_mpeg_flush,
724 .max_lowres = 3,
725 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
726 };
727
728 AVCodec ff_h263p_decoder = {
729 .name = "h263p",
730 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
731 .type = AVMEDIA_TYPE_VIDEO,
732 .id = AV_CODEC_ID_H263P,
733 .priv_data_size = sizeof(MpegEncContext),
734 .init = ff_h263_decode_init,
735 .close = ff_h263_decode_end,
736 .decode = ff_h263_decode_frame,
737 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
738 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
739 .flush = ff_mpeg_flush,
740 .max_lowres = 3,
741 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
742 };
743