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 "libavutil/video_enc_params.h"
32
33 #include "avcodec.h"
34 #include "error_resilience.h"
35 #include "flv.h"
36 #include "h263.h"
37 #include "h263_parser.h"
38 #include "hwconfig.h"
39 #include "internal.h"
40 #include "mpeg_er.h"
41 #include "mpeg4video.h"
42 #include "mpeg4video_parser.h"
43 #include "mpegutils.h"
44 #include "mpegvideo.h"
45 #include "msmpeg4.h"
46 #include "qpeldsp.h"
47 #include "thread.h"
48 #include "wmv2.h"
49
h263_get_format(AVCodecContext * avctx)50 static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
51 {
52 /* MPEG-4 Studio Profile only, not supported by hardware */
53 if (avctx->bits_per_raw_sample > 8) {
54 av_assert1(((MpegEncContext *)avctx->priv_data)->studio_profile);
55 return avctx->pix_fmt;
56 }
57
58 if (avctx->codec->id == AV_CODEC_ID_MSS2)
59 return AV_PIX_FMT_YUV420P;
60
61 if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
62 if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED)
63 avctx->color_range = AVCOL_RANGE_MPEG;
64 return AV_PIX_FMT_GRAY8;
65 }
66
67 return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
68 }
69
ff_h263_decode_init(AVCodecContext * avctx)70 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
71 {
72 MpegEncContext *s = avctx->priv_data;
73 int ret;
74
75 s->out_format = FMT_H263;
76
77 // set defaults
78 ff_mpv_decode_init(s, avctx);
79
80 s->quant_precision = 5;
81 s->decode_mb = ff_h263_decode_mb;
82 s->low_delay = 1;
83 s->unrestricted_mv = 1;
84
85 /* select sub codec */
86 switch (avctx->codec->id) {
87 case AV_CODEC_ID_H263:
88 case AV_CODEC_ID_H263P:
89 s->unrestricted_mv = 0;
90 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
91 break;
92 case AV_CODEC_ID_MPEG4:
93 break;
94 case AV_CODEC_ID_MSMPEG4V1:
95 s->h263_pred = 1;
96 s->msmpeg4_version = 1;
97 break;
98 case AV_CODEC_ID_MSMPEG4V2:
99 s->h263_pred = 1;
100 s->msmpeg4_version = 2;
101 break;
102 case AV_CODEC_ID_MSMPEG4V3:
103 s->h263_pred = 1;
104 s->msmpeg4_version = 3;
105 break;
106 case AV_CODEC_ID_WMV1:
107 s->h263_pred = 1;
108 s->msmpeg4_version = 4;
109 break;
110 case AV_CODEC_ID_WMV2:
111 s->h263_pred = 1;
112 s->msmpeg4_version = 5;
113 break;
114 case AV_CODEC_ID_VC1:
115 case AV_CODEC_ID_WMV3:
116 case AV_CODEC_ID_VC1IMAGE:
117 case AV_CODEC_ID_WMV3IMAGE:
118 case AV_CODEC_ID_MSS2:
119 s->h263_pred = 1;
120 s->msmpeg4_version = 6;
121 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
122 break;
123 case AV_CODEC_ID_H263I:
124 break;
125 case AV_CODEC_ID_FLV1:
126 s->h263_flv = 1;
127 break;
128 default:
129 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
130 avctx->codec->id);
131 return AVERROR(ENOSYS);
132 }
133 s->codec_id = avctx->codec->id;
134
135 if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
136 if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
137 s->ehc_mode = 1;
138
139 /* for H.263, we allocate the images after having read the header */
140 if (avctx->codec->id != AV_CODEC_ID_H263 &&
141 avctx->codec->id != AV_CODEC_ID_H263P &&
142 avctx->codec->id != AV_CODEC_ID_MPEG4) {
143 avctx->pix_fmt = h263_get_format(avctx);
144 ff_mpv_idct_init(s);
145 if ((ret = ff_mpv_common_init(s)) < 0)
146 return ret;
147 }
148
149 ff_h263dsp_init(&s->h263dsp);
150 ff_qpeldsp_init(&s->qdsp);
151 ff_h263_decode_init_vlc();
152
153 return 0;
154 }
155
ff_h263_decode_end(AVCodecContext * avctx)156 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
157 {
158 MpegEncContext *s = avctx->priv_data;
159
160 ff_mpv_common_end(s);
161 return 0;
162 }
163
164 /**
165 * Return the number of bytes consumed for building the current frame.
166 */
get_consumed_bytes(MpegEncContext * s,int buf_size)167 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
168 {
169 int pos = (get_bits_count(&s->gb) + 7) >> 3;
170
171 if (s->divx_packed || s->avctx->hwaccel) {
172 /* We would have to scan through the whole buf to handle the weird
173 * reordering ... */
174 return buf_size;
175 } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
176 pos -= s->parse_context.last_index;
177 // padding is not really read so this might be -1
178 if (pos < 0)
179 pos = 0;
180 return pos;
181 } else {
182 // avoid infinite loops (maybe not needed...)
183 if (pos == 0)
184 pos = 1;
185 // oops ;)
186 if (pos + 10 > buf_size)
187 pos = buf_size;
188
189 return pos;
190 }
191 }
192
decode_slice(MpegEncContext * s)193 static int decode_slice(MpegEncContext *s)
194 {
195 const int part_mask = s->partitioned_frame
196 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
197 const int mb_size = 16 >> s->avctx->lowres;
198 int ret;
199
200 s->last_resync_gb = s->gb;
201 s->first_slice_line = 1;
202 s->resync_mb_x = s->mb_x;
203 s->resync_mb_y = s->mb_y;
204
205 ff_set_qscale(s, s->qscale);
206
207 if (s->studio_profile) {
208 if ((ret = ff_mpeg4_decode_studio_slice_header(s->avctx->priv_data)) < 0)
209 return ret;
210 }
211
212 if (s->avctx->hwaccel) {
213 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
214 ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
215 // ensure we exit decode loop
216 s->mb_y = s->mb_height;
217 return ret;
218 }
219
220 if (s->partitioned_frame) {
221 const int qscale = s->qscale;
222
223 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
224 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
225 return ret;
226
227 /* restore variables which were modified */
228 s->first_slice_line = 1;
229 s->mb_x = s->resync_mb_x;
230 s->mb_y = s->resync_mb_y;
231 ff_set_qscale(s, qscale);
232 }
233
234 for (; s->mb_y < s->mb_height; s->mb_y++) {
235 /* per-row end of slice checks */
236 if (s->msmpeg4_version) {
237 if (s->resync_mb_y + s->slice_height == s->mb_y) {
238 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
239 s->mb_x - 1, s->mb_y, ER_MB_END);
240
241 return 0;
242 }
243 }
244
245 if (s->msmpeg4_version == 1) {
246 s->last_dc[0] =
247 s->last_dc[1] =
248 s->last_dc[2] = 128;
249 }
250
251 ff_init_block_index(s);
252 for (; s->mb_x < s->mb_width; s->mb_x++) {
253 int ret;
254
255 ff_update_block_index(s);
256
257 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
258 s->first_slice_line = 0;
259
260 /* DCT & quantize */
261
262 s->mv_dir = MV_DIR_FORWARD;
263 s->mv_type = MV_TYPE_16X16;
264 ff_dlog(s, "%d %06X\n",
265 get_bits_count(&s->gb), show_bits(&s->gb, 24));
266
267 ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
268 ret = s->decode_mb(s, s->block);
269
270 if (s->pict_type != AV_PICTURE_TYPE_B)
271 ff_h263_update_motion_val(s);
272
273 if (ret < 0) {
274 const int xy = s->mb_x + s->mb_y * s->mb_stride;
275 if (ret == SLICE_END) {
276 ff_mpv_reconstruct_mb(s, s->block);
277 if (s->loop_filter)
278 ff_h263_loop_filter(s);
279
280 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
281 s->mb_x, s->mb_y, ER_MB_END & part_mask);
282
283 s->padding_bug_score--;
284
285 if (++s->mb_x >= s->mb_width) {
286 s->mb_x = 0;
287 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
288 ff_mpv_report_decode_progress(s);
289 s->mb_y++;
290 }
291 return 0;
292 } else if (ret == SLICE_NOEND) {
293 av_log(s->avctx, AV_LOG_ERROR,
294 "Slice mismatch at MB: %d\n", xy);
295 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
296 s->mb_x + 1, s->mb_y,
297 ER_MB_END & part_mask);
298 return AVERROR_INVALIDDATA;
299 }
300 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
301 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
302 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
303
304 if (s->avctx->err_recognition & AV_EF_IGNORE_ERR)
305 continue;
306 return AVERROR_INVALIDDATA;
307 }
308
309 ff_mpv_reconstruct_mb(s, s->block);
310 if (s->loop_filter)
311 ff_h263_loop_filter(s);
312 }
313
314 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
315 ff_mpv_report_decode_progress(s);
316
317 s->mb_x = 0;
318 }
319
320 av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
321
322 // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
323 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
324 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
325 get_bits_left(&s->gb) >= 48 &&
326 show_bits(&s->gb, 24) == 0x4010 &&
327 !s->data_partitioning)
328 s->padding_bug_score += 32;
329
330 /* try to detect the padding bug */
331 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
332 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
333 get_bits_left(&s->gb) >= 0 &&
334 get_bits_left(&s->gb) < 137 &&
335 !s->data_partitioning) {
336 const int bits_count = get_bits_count(&s->gb);
337 const int bits_left = s->gb.size_in_bits - bits_count;
338
339 if (bits_left == 0) {
340 s->padding_bug_score += 16;
341 } else if (bits_left != 1) {
342 int v = show_bits(&s->gb, 8);
343 v |= 0x7F >> (7 - (bits_count & 7));
344
345 if (v == 0x7F && bits_left <= 8)
346 s->padding_bug_score--;
347 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
348 bits_left <= 16)
349 s->padding_bug_score += 4;
350 else
351 s->padding_bug_score++;
352 }
353 }
354
355 if (s->codec_id == AV_CODEC_ID_H263 &&
356 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
357 get_bits_left(&s->gb) >= 8 &&
358 get_bits_left(&s->gb) < 300 &&
359 s->pict_type == AV_PICTURE_TYPE_I &&
360 show_bits(&s->gb, 8) == 0 &&
361 !s->data_partitioning) {
362
363 s->padding_bug_score += 32;
364 }
365
366 if (s->codec_id == AV_CODEC_ID_H263 &&
367 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
368 get_bits_left(&s->gb) >= 64 &&
369 AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
370
371 s->padding_bug_score += 32;
372 }
373
374 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
375 if (
376 (s->padding_bug_score > -2 && !s->data_partitioning))
377 s->workaround_bugs |= FF_BUG_NO_PADDING;
378 else
379 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
380 }
381
382 // handle formats which don't have unique end markers
383 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
384 int left = get_bits_left(&s->gb);
385 int max_extra = 7;
386
387 /* no markers in M$ crap */
388 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
389 max_extra += 17;
390
391 /* buggy padding but the frame should still end approximately at
392 * the bitstream end */
393 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
394 (s->avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
395 max_extra += 48;
396 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
397 max_extra += 256 * 256 * 256 * 64;
398
399 if (left > max_extra)
400 av_log(s->avctx, AV_LOG_ERROR,
401 "discarding %d junk bits at end, next would be %X\n",
402 left, show_bits(&s->gb, 24));
403 else if (left < 0)
404 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
405 else
406 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
407 s->mb_x - 1, s->mb_y, ER_MB_END);
408
409 return 0;
410 }
411
412 av_log(s->avctx, AV_LOG_ERROR,
413 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
414 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
415
416 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
417 ER_MB_END & part_mask);
418
419 return AVERROR_INVALIDDATA;
420 }
421
ff_h263_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)422 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
423 AVPacket *avpkt)
424 {
425 const uint8_t *buf = avpkt->data;
426 int buf_size = avpkt->size;
427 MpegEncContext *s = avctx->priv_data;
428 int ret;
429 int slice_ret = 0;
430 AVFrame *pict = data;
431
432 /* no supplementary picture */
433 if (buf_size == 0) {
434 /* special case for last picture */
435 if (s->low_delay == 0 && s->next_picture_ptr) {
436 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
437 return ret;
438 s->next_picture_ptr = NULL;
439
440 *got_frame = 1;
441 }
442
443 return 0;
444 }
445
446 if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
447 int next;
448
449 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
450 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
451 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
452 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
453 } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
454 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
455 } else {
456 av_log(s->avctx, AV_LOG_ERROR,
457 "this codec does not support truncated bitstreams\n");
458 return AVERROR(ENOSYS);
459 }
460
461 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
462 &buf_size) < 0)
463 return buf_size;
464 }
465
466 retry:
467 if (s->divx_packed && s->bitstream_buffer_size) {
468 int i;
469 for(i=0; i < buf_size-3; i++) {
470 if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
471 if (buf[i+3]==0xB0) {
472 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
473 s->bitstream_buffer_size = 0;
474 }
475 break;
476 }
477 }
478 }
479
480 if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
481 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
482 s->bitstream_buffer_size);
483 else
484 ret = init_get_bits8(&s->gb, buf, buf_size);
485
486 s->bitstream_buffer_size = 0;
487 if (ret < 0)
488 return ret;
489
490 if (!s->context_initialized)
491 // we need the idct permutation for reading a custom matrix
492 ff_mpv_idct_init(s);
493
494 /* let's go :-) */
495 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
496 ret = ff_wmv2_decode_picture_header(s);
497 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
498 ret = ff_msmpeg4_decode_picture_header(s);
499 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
500 if (s->avctx->extradata_size && s->picture_number == 0) {
501 GetBitContext gb;
502
503 if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
504 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb, 1);
505 }
506 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb, 0);
507 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
508 ret = ff_intel_h263_decode_picture_header(s);
509 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
510 ret = ff_flv_decode_picture_header(s);
511 } else {
512 ret = ff_h263_decode_picture_header(s);
513 }
514
515 if (ret < 0 || ret == FRAME_SKIPPED) {
516 if ( s->width != avctx->coded_width
517 || s->height != avctx->coded_height) {
518 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
519 s->width = avctx->coded_width;
520 s->height= avctx->coded_height;
521 }
522 }
523 if (ret == FRAME_SKIPPED)
524 return get_consumed_bytes(s, buf_size);
525
526 /* skip if the header was thrashed */
527 if (ret < 0) {
528 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
529 return ret;
530 }
531
532 if (!s->context_initialized) {
533 avctx->pix_fmt = h263_get_format(avctx);
534 if ((ret = ff_mpv_common_init(s)) < 0)
535 return ret;
536 }
537
538 if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
539 int i = ff_find_unused_picture(s->avctx, s->picture, 0);
540 if (i < 0)
541 return i;
542 s->current_picture_ptr = &s->picture[i];
543 }
544
545 avctx->has_b_frames = !s->low_delay;
546
547 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
548 if (ff_mpeg4_workaround_bugs(avctx) == 1)
549 goto retry;
550 if (s->studio_profile != (s->idsp.idct == NULL))
551 ff_mpv_idct_init(s);
552 }
553
554 /* After H.263 & MPEG-4 header decode we have the height, width,
555 * and other parameters. So then we could init the picture.
556 * FIXME: By the way H.263 decoder is evolving it should have
557 * an H263EncContext */
558 if (s->width != avctx->coded_width ||
559 s->height != avctx->coded_height ||
560 s->context_reinit) {
561 /* H.263 could change picture size any time */
562 s->context_reinit = 0;
563
564 ret = ff_set_dimensions(avctx, s->width, s->height);
565 if (ret < 0)
566 return ret;
567
568 ff_set_sar(avctx, avctx->sample_aspect_ratio);
569
570 if ((ret = ff_mpv_common_frame_size_change(s)))
571 return ret;
572
573 if (avctx->pix_fmt != h263_get_format(avctx)) {
574 av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
575 avctx->pix_fmt = AV_PIX_FMT_NONE;
576 return AVERROR_UNKNOWN;
577 }
578 }
579
580 if (s->codec_id == AV_CODEC_ID_H263 ||
581 s->codec_id == AV_CODEC_ID_H263P ||
582 s->codec_id == AV_CODEC_ID_H263I)
583 s->gob_index = H263_GOB_HEIGHT(s->height);
584
585 // for skipping the frame
586 s->current_picture.f->pict_type = s->pict_type;
587 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
588
589 /* skip B-frames if we don't have reference frames */
590 if (!s->last_picture_ptr &&
591 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
592 return get_consumed_bytes(s, buf_size);
593 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
594 s->pict_type == AV_PICTURE_TYPE_B) ||
595 (avctx->skip_frame >= AVDISCARD_NONKEY &&
596 s->pict_type != AV_PICTURE_TYPE_I) ||
597 avctx->skip_frame >= AVDISCARD_ALL)
598 return get_consumed_bytes(s, buf_size);
599
600 if (s->next_p_frame_damaged) {
601 if (s->pict_type == AV_PICTURE_TYPE_B)
602 return get_consumed_bytes(s, buf_size);
603 else
604 s->next_p_frame_damaged = 0;
605 }
606
607 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
608 s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
609 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
610 } else {
611 s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
612 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
613 }
614
615 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
616 return ret;
617
618 if (!s->divx_packed && !avctx->hwaccel)
619 ff_thread_finish_setup(avctx);
620
621 if (avctx->hwaccel) {
622 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
623 s->gb.buffer_end - s->gb.buffer);
624 if (ret < 0 )
625 return ret;
626 }
627
628 ff_mpeg_er_frame_start(s);
629
630 /* the second part of the wmv2 header contains the MB skip bits which
631 * are stored in current_picture->mb_type which is not available before
632 * ff_mpv_frame_start() */
633 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
634 ret = ff_wmv2_decode_secondary_picture_header(s);
635 if (ret < 0)
636 return ret;
637 if (ret == 1)
638 goto frame_end;
639 }
640
641 /* decode each macroblock */
642 s->mb_x = 0;
643 s->mb_y = 0;
644
645 slice_ret = decode_slice(s);
646 while (s->mb_y < s->mb_height) {
647 if (s->msmpeg4_version) {
648 if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 ||
649 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
650 break;
651 } else {
652 int prev_x = s->mb_x, prev_y = s->mb_y;
653 if (ff_h263_resync(s) < 0)
654 break;
655 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
656 s->er.error_occurred = 1;
657 }
658
659 if (s->msmpeg4_version < 4 && s->h263_pred)
660 ff_mpeg4_clean_buffers(s);
661
662 if (decode_slice(s) < 0)
663 slice_ret = AVERROR_INVALIDDATA;
664 }
665
666 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
667 s->pict_type == AV_PICTURE_TYPE_I)
668 if (!CONFIG_MSMPEG4_DECODER ||
669 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
670 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
671
672 av_assert1(s->bitstream_buffer_size == 0);
673 frame_end:
674 if (!s->studio_profile)
675 ff_er_frame_end(&s->er);
676
677 if (avctx->hwaccel) {
678 ret = avctx->hwaccel->end_frame(avctx);
679 if (ret < 0)
680 return ret;
681 }
682
683 ff_mpv_frame_end(s);
684
685 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
686 ff_mpeg4_frame_end(avctx, buf, buf_size);
687
688 if (!s->divx_packed && avctx->hwaccel)
689 ff_thread_finish_setup(avctx);
690
691 av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type);
692 av_assert1(s->current_picture.f->pict_type == s->pict_type);
693 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
694 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
695 return ret;
696 ff_print_debug_info(s, s->current_picture_ptr, pict);
697 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
698 } else if (s->last_picture_ptr) {
699 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
700 return ret;
701 ff_print_debug_info(s, s->last_picture_ptr, pict);
702 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
703 }
704
705 if (s->last_picture_ptr || s->low_delay) {
706 if ( pict->format == AV_PIX_FMT_YUV420P
707 && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
708 int x, y, p;
709 av_frame_make_writable(pict);
710 for (p=0; p<3; p++) {
711 int w = AV_CEIL_RSHIFT(pict-> width, !!p);
712 int h = AV_CEIL_RSHIFT(pict->height, !!p);
713 int linesize = pict->linesize[p];
714 for (y=0; y<(h>>1); y++)
715 for (x=0; x<w; x++)
716 FFSWAP(int,
717 pict->data[p][x + y*linesize],
718 pict->data[p][x + (h-1-y)*linesize]);
719 }
720 }
721 *got_frame = 1;
722 }
723
724 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
725 return slice_ret;
726 else
727 return get_consumed_bytes(s, buf_size);
728 }
729
730 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
731 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
732 AV_PIX_FMT_VAAPI,
733 #endif
734 #if CONFIG_MPEG4_NVDEC_HWACCEL
735 AV_PIX_FMT_CUDA,
736 #endif
737 #if CONFIG_MPEG4_VDPAU_HWACCEL
738 AV_PIX_FMT_VDPAU,
739 #endif
740 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
741 AV_PIX_FMT_VIDEOTOOLBOX,
742 #endif
743 AV_PIX_FMT_YUV420P,
744 AV_PIX_FMT_NONE
745 };
746
747 const AVCodecHWConfigInternal *const ff_h263_hw_config_list[] = {
748 #if CONFIG_H263_VAAPI_HWACCEL
749 HWACCEL_VAAPI(h263),
750 #endif
751 #if CONFIG_MPEG4_NVDEC_HWACCEL
752 HWACCEL_NVDEC(mpeg4),
753 #endif
754 #if CONFIG_MPEG4_VDPAU_HWACCEL
755 HWACCEL_VDPAU(mpeg4),
756 #endif
757 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
758 HWACCEL_VIDEOTOOLBOX(h263),
759 #endif
760 NULL
761 };
762
763 AVCodec ff_h263_decoder = {
764 .name = "h263",
765 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
766 .type = AVMEDIA_TYPE_VIDEO,
767 .id = AV_CODEC_ID_H263,
768 .priv_data_size = sizeof(MpegEncContext),
769 .init = ff_h263_decode_init,
770 .close = ff_h263_decode_end,
771 .decode = ff_h263_decode_frame,
772 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
773 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
774 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
775 .flush = ff_mpeg_flush,
776 .max_lowres = 3,
777 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
778 .hw_configs = ff_h263_hw_config_list,
779 };
780
781 AVCodec ff_h263p_decoder = {
782 .name = "h263p",
783 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
784 .type = AVMEDIA_TYPE_VIDEO,
785 .id = AV_CODEC_ID_H263P,
786 .priv_data_size = sizeof(MpegEncContext),
787 .init = ff_h263_decode_init,
788 .close = ff_h263_decode_end,
789 .decode = ff_h263_decode_frame,
790 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
791 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
792 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
793 .flush = ff_mpeg_flush,
794 .max_lowres = 3,
795 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
796 .hw_configs = ff_h263_hw_config_list,
797 };
798