3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
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.
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.
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
28 #define UNCHECKED_BITSTREAM_READER 1
30 #include "libavutil/cpu.h"
32 #include "error_resilience.h"
35 #include "h263_parser.h"
39 #include "mpeg4video.h"
40 #include "mpeg4video_parser.h"
41 #include "mpegutils.h"
42 #include "mpegvideo.h"
48 static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
50 /* MPEG-4 Studio Profile only, not supported by hardware */
51 if (avctx->bits_per_raw_sample > 8) {
52 av_assert1(avctx->profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO);
53 return avctx->pix_fmt;
56 if (avctx->codec->id == AV_CODEC_ID_MSS2)
57 return AV_PIX_FMT_YUV420P;
59 if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
60 if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED)
61 avctx->color_range = AVCOL_RANGE_MPEG;
62 return AV_PIX_FMT_GRAY8;
65 return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
68 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
70 MpegEncContext *s = avctx->priv_data;
73 s->out_format = FMT_H263;
76 ff_mpv_decode_defaults(s);
77 ff_mpv_decode_init(s, avctx);
79 s->quant_precision = 5;
80 s->decode_mb = ff_h263_decode_mb;
82 s->unrestricted_mv = 1;
84 /* select sub codec */
85 switch (avctx->codec->id) {
86 case AV_CODEC_ID_H263:
87 case AV_CODEC_ID_H263P:
88 s->unrestricted_mv = 0;
89 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
91 case AV_CODEC_ID_MPEG4:
93 case AV_CODEC_ID_MSMPEG4V1:
95 s->msmpeg4_version = 1;
97 case AV_CODEC_ID_MSMPEG4V2:
99 s->msmpeg4_version = 2;
101 case AV_CODEC_ID_MSMPEG4V3:
103 s->msmpeg4_version = 3;
105 case AV_CODEC_ID_WMV1:
107 s->msmpeg4_version = 4;
109 case AV_CODEC_ID_WMV2:
111 s->msmpeg4_version = 5;
113 case AV_CODEC_ID_VC1:
114 case AV_CODEC_ID_WMV3:
115 case AV_CODEC_ID_VC1IMAGE:
116 case AV_CODEC_ID_WMV3IMAGE:
117 case AV_CODEC_ID_MSS2:
119 s->msmpeg4_version = 6;
120 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
122 case AV_CODEC_ID_H263I:
124 case AV_CODEC_ID_FLV1:
128 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
130 return AVERROR(ENOSYS);
132 s->codec_id = avctx->codec->id;
134 if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
135 if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
138 /* for H.263, we allocate the images after having read the header */
139 if (avctx->codec->id != AV_CODEC_ID_H263 &&
140 avctx->codec->id != AV_CODEC_ID_H263P &&
141 avctx->codec->id != AV_CODEC_ID_MPEG4) {
142 avctx->pix_fmt = h263_get_format(avctx);
144 if ((ret = ff_mpv_common_init(s)) < 0)
148 ff_h263dsp_init(&s->h263dsp);
149 ff_qpeldsp_init(&s->qdsp);
150 ff_h263_decode_init_vlc();
155 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
157 MpegEncContext *s = avctx->priv_data;
159 ff_mpv_common_end(s);
164 * Return the number of bytes consumed for building the current frame.
166 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
168 int pos = (get_bits_count(&s->gb) + 7) >> 3;
170 if (s->divx_packed || s->avctx->hwaccel) {
171 /* We would have to scan through the whole buf to handle the weird
174 } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
175 pos -= s->parse_context.last_index;
176 // padding is not really read so this might be -1
181 // avoid infinite loops (maybe not needed...)
185 if (pos + 10 > buf_size)
192 static int decode_slice(MpegEncContext *s)
194 const int part_mask = s->partitioned_frame
195 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
196 const int mb_size = 16 >> s->avctx->lowres;
199 s->last_resync_gb = s->gb;
200 s->first_slice_line = 1;
201 s->resync_mb_x = s->mb_x;
202 s->resync_mb_y = s->mb_y;
204 ff_set_qscale(s, s->qscale);
206 if (s->studio_profile) {
207 if ((ret = ff_mpeg4_decode_studio_slice_header(s->avctx->priv_data)) < 0)
211 if (s->avctx->hwaccel) {
212 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
213 ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
214 // ensure we exit decode loop
215 s->mb_y = s->mb_height;
219 if (s->partitioned_frame) {
220 const int qscale = s->qscale;
222 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
223 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
226 /* restore variables which were modified */
227 s->first_slice_line = 1;
228 s->mb_x = s->resync_mb_x;
229 s->mb_y = s->resync_mb_y;
230 ff_set_qscale(s, qscale);
233 for (; s->mb_y < s->mb_height; s->mb_y++) {
234 /* per-row end of slice checks */
235 if (s->msmpeg4_version) {
236 if (s->resync_mb_y + s->slice_height == s->mb_y) {
237 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
238 s->mb_x - 1, s->mb_y, ER_MB_END);
244 if (s->msmpeg4_version == 1) {
250 ff_init_block_index(s);
251 for (; s->mb_x < s->mb_width; s->mb_x++) {
254 ff_update_block_index(s);
256 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
257 s->first_slice_line = 0;
261 s->mv_dir = MV_DIR_FORWARD;
262 s->mv_type = MV_TYPE_16X16;
263 ff_dlog(s, "%d %06X\n",
264 get_bits_count(&s->gb), show_bits(&s->gb, 24));
266 ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
267 ret = s->decode_mb(s, s->block);
269 if (s->pict_type != AV_PICTURE_TYPE_B)
270 ff_h263_update_motion_val(s);
273 const int xy = s->mb_x + s->mb_y * s->mb_stride;
274 if (ret == SLICE_END) {
275 ff_mpv_reconstruct_mb(s, s->block);
277 ff_h263_loop_filter(s);
279 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
280 s->mb_x, s->mb_y, ER_MB_END & part_mask);
282 s->padding_bug_score--;
284 if (++s->mb_x >= s->mb_width) {
286 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
287 ff_mpv_report_decode_progress(s);
291 } else if (ret == SLICE_NOEND) {
292 av_log(s->avctx, AV_LOG_ERROR,
293 "Slice mismatch at MB: %d\n", xy);
294 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
295 s->mb_x + 1, s->mb_y,
296 ER_MB_END & part_mask);
297 return AVERROR_INVALIDDATA;
299 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
300 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
301 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
303 if (s->avctx->err_recognition & AV_EF_IGNORE_ERR)
305 return AVERROR_INVALIDDATA;
308 ff_mpv_reconstruct_mb(s, s->block);
310 ff_h263_loop_filter(s);
313 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
314 ff_mpv_report_decode_progress(s);
319 av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
321 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
322 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
323 get_bits_left(&s->gb) >= 48 &&
324 show_bits(&s->gb, 24) == 0x4010 &&
325 !s->data_partitioning)
326 s->padding_bug_score += 32;
328 /* try to detect the padding bug */
329 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
330 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
331 get_bits_left(&s->gb) >= 0 &&
332 get_bits_left(&s->gb) < 137 &&
333 !s->data_partitioning) {
334 const int bits_count = get_bits_count(&s->gb);
335 const int bits_left = s->gb.size_in_bits - bits_count;
337 if (bits_left == 0) {
338 s->padding_bug_score += 16;
339 } else if (bits_left != 1) {
340 int v = show_bits(&s->gb, 8);
341 v |= 0x7F >> (7 - (bits_count & 7));
343 if (v == 0x7F && bits_left <= 8)
344 s->padding_bug_score--;
345 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
347 s->padding_bug_score += 4;
349 s->padding_bug_score++;
353 if (s->codec_id == AV_CODEC_ID_H263 &&
354 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
355 get_bits_left(&s->gb) >= 8 &&
356 get_bits_left(&s->gb) < 300 &&
357 s->pict_type == AV_PICTURE_TYPE_I &&
358 show_bits(&s->gb, 8) == 0 &&
359 !s->data_partitioning) {
361 s->padding_bug_score += 32;
364 if (s->codec_id == AV_CODEC_ID_H263 &&
365 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
366 get_bits_left(&s->gb) >= 64 &&
367 AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
369 s->padding_bug_score += 32;
372 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
374 (s->padding_bug_score > -2 && !s->data_partitioning))
375 s->workaround_bugs |= FF_BUG_NO_PADDING;
377 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
380 // handle formats which don't have unique end markers
381 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
382 int left = get_bits_left(&s->gb);
385 /* no markers in M$ crap */
386 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
389 /* buggy padding but the frame should still end approximately at
390 * the bitstream end */
391 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
392 (s->avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
394 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
395 max_extra += 256 * 256 * 256 * 64;
397 if (left > max_extra)
398 av_log(s->avctx, AV_LOG_ERROR,
399 "discarding %d junk bits at end, next would be %X\n",
400 left, show_bits(&s->gb, 24));
402 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
404 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
405 s->mb_x - 1, s->mb_y, ER_MB_END);
410 av_log(s->avctx, AV_LOG_ERROR,
411 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
412 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
414 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
415 ER_MB_END & part_mask);
417 return AVERROR_INVALIDDATA;
420 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
423 const uint8_t *buf = avpkt->data;
424 int buf_size = avpkt->size;
425 MpegEncContext *s = avctx->priv_data;
428 AVFrame *pict = data;
430 /* no supplementary picture */
432 /* special case for last picture */
433 if (s->low_delay == 0 && s->next_picture_ptr) {
434 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
436 s->next_picture_ptr = NULL;
444 if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
447 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
448 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
449 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
450 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
451 } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
452 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
454 av_log(s->avctx, AV_LOG_ERROR,
455 "this codec does not support truncated bitstreams\n");
456 return AVERROR(ENOSYS);
459 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
465 if (s->divx_packed && s->bitstream_buffer_size) {
467 for(i=0; i < buf_size-3; i++) {
468 if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
469 if (buf[i+3]==0xB0) {
470 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
471 s->bitstream_buffer_size = 0;
478 if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
479 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
480 s->bitstream_buffer_size);
482 ret = init_get_bits8(&s->gb, buf, buf_size);
484 s->bitstream_buffer_size = 0;
488 if (!s->context_initialized)
489 // we need the idct permutation for reading a custom matrix
493 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
494 ret = ff_wmv2_decode_picture_header(s);
495 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
496 ret = ff_msmpeg4_decode_picture_header(s);
497 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
498 if (s->avctx->extradata_size && s->picture_number == 0) {
501 if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
502 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb);
504 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
505 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
506 ret = ff_intel_h263_decode_picture_header(s);
507 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
508 ret = ff_flv_decode_picture_header(s);
510 ret = ff_h263_decode_picture_header(s);
513 if (ret < 0 || ret == FRAME_SKIPPED) {
514 if ( s->width != avctx->coded_width
515 || s->height != avctx->coded_height) {
516 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
517 s->width = avctx->coded_width;
518 s->height= avctx->coded_height;
521 if (ret == FRAME_SKIPPED)
522 return get_consumed_bytes(s, buf_size);
524 /* skip if the header was thrashed */
526 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
530 if (!s->context_initialized) {
531 avctx->pix_fmt = h263_get_format(avctx);
532 if ((ret = ff_mpv_common_init(s)) < 0)
536 if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
537 int i = ff_find_unused_picture(s->avctx, s->picture, 0);
540 s->current_picture_ptr = &s->picture[i];
543 avctx->has_b_frames = !s->low_delay;
545 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
546 if (ff_mpeg4_workaround_bugs(avctx) == 1)
550 /* After H.263 & MPEG-4 header decode we have the height, width,
551 * and other parameters. So then we could init the picture.
552 * FIXME: By the way H.263 decoder is evolving it should have
553 * an H263EncContext */
554 if (s->width != avctx->coded_width ||
555 s->height != avctx->coded_height ||
557 /* H.263 could change picture size any time */
558 s->context_reinit = 0;
560 ret = ff_set_dimensions(avctx, s->width, s->height);
564 ff_set_sar(avctx, avctx->sample_aspect_ratio);
566 if ((ret = ff_mpv_common_frame_size_change(s)))
569 if (avctx->pix_fmt != h263_get_format(avctx)) {
570 av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
571 avctx->pix_fmt = AV_PIX_FMT_NONE;
572 return AVERROR_UNKNOWN;
576 if (s->codec_id == AV_CODEC_ID_H263 ||
577 s->codec_id == AV_CODEC_ID_H263P ||
578 s->codec_id == AV_CODEC_ID_H263I)
579 s->gob_index = H263_GOB_HEIGHT(s->height);
581 // for skipping the frame
582 s->current_picture.f->pict_type = s->pict_type;
583 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
585 /* skip B-frames if we don't have reference frames */
586 if (!s->last_picture_ptr &&
587 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
588 return get_consumed_bytes(s, buf_size);
589 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
590 s->pict_type == AV_PICTURE_TYPE_B) ||
591 (avctx->skip_frame >= AVDISCARD_NONKEY &&
592 s->pict_type != AV_PICTURE_TYPE_I) ||
593 avctx->skip_frame >= AVDISCARD_ALL)
594 return get_consumed_bytes(s, buf_size);
596 if (s->next_p_frame_damaged) {
597 if (s->pict_type == AV_PICTURE_TYPE_B)
598 return get_consumed_bytes(s, buf_size);
600 s->next_p_frame_damaged = 0;
603 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
604 s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
605 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
607 s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
608 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
611 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
615 ff_thread_finish_setup(avctx);
617 if (avctx->hwaccel) {
618 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
619 s->gb.buffer_end - s->gb.buffer);
624 ff_mpeg_er_frame_start(s);
626 /* the second part of the wmv2 header contains the MB skip bits which
627 * are stored in current_picture->mb_type which is not available before
628 * ff_mpv_frame_start() */
629 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
630 ret = ff_wmv2_decode_secondary_picture_header(s);
637 /* decode each macroblock */
641 slice_ret = decode_slice(s);
642 while (s->mb_y < s->mb_height) {
643 if (s->msmpeg4_version) {
644 if (s->slice_height == 0 || s->mb_x != 0 ||
645 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
648 int prev_x = s->mb_x, prev_y = s->mb_y;
649 if (ff_h263_resync(s) < 0)
651 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
652 s->er.error_occurred = 1;
655 if (s->msmpeg4_version < 4 && s->h263_pred)
656 ff_mpeg4_clean_buffers(s);
658 if (decode_slice(s) < 0)
659 slice_ret = AVERROR_INVALIDDATA;
662 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
663 s->pict_type == AV_PICTURE_TYPE_I)
664 if (!CONFIG_MSMPEG4_DECODER ||
665 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
666 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
668 av_assert1(s->bitstream_buffer_size == 0);
670 ff_er_frame_end(&s->er);
672 if (avctx->hwaccel) {
673 ret = avctx->hwaccel->end_frame(avctx);
680 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
681 ff_mpeg4_frame_end(avctx, buf, buf_size);
683 if (!s->divx_packed && avctx->hwaccel)
684 ff_thread_finish_setup(avctx);
686 av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type);
687 av_assert1(s->current_picture.f->pict_type == s->pict_type);
688 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
689 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
691 ff_print_debug_info(s, s->current_picture_ptr, pict);
692 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
693 } else if (s->last_picture_ptr) {
694 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
696 ff_print_debug_info(s, s->last_picture_ptr, pict);
697 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
700 if (s->last_picture_ptr || s->low_delay) {
701 if ( pict->format == AV_PIX_FMT_YUV420P
702 && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
704 av_frame_make_writable(pict);
705 for (p=0; p<3; p++) {
706 int w = AV_CEIL_RSHIFT(pict-> width, !!p);
707 int h = AV_CEIL_RSHIFT(pict->height, !!p);
708 int linesize = pict->linesize[p];
709 for (y=0; y<(h>>1); y++)
712 pict->data[p][x + y*linesize],
713 pict->data[p][x + (h-1-y)*linesize]);
719 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
722 return get_consumed_bytes(s, buf_size);
725 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
726 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
729 #if CONFIG_MPEG4_NVDEC_HWACCEL
732 #if CONFIG_MPEG4_VDPAU_HWACCEL
735 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
736 AV_PIX_FMT_VIDEOTOOLBOX,
742 AVCodec ff_h263_decoder = {
744 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
745 .type = AVMEDIA_TYPE_VIDEO,
746 .id = AV_CODEC_ID_H263,
747 .priv_data_size = sizeof(MpegEncContext),
748 .init = ff_h263_decode_init,
749 .close = ff_h263_decode_end,
750 .decode = ff_h263_decode_frame,
751 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
752 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
753 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
754 .flush = ff_mpeg_flush,
756 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
759 AVCodec ff_h263p_decoder = {
761 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
762 .type = AVMEDIA_TYPE_VIDEO,
763 .id = AV_CODEC_ID_H263P,
764 .priv_data_size = sizeof(MpegEncContext),
765 .init = ff_h263_decode_init,
766 .close = ff_h263_decode_end,
767 .decode = ff_h263_decode_frame,
768 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
769 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
770 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
771 .flush = ff_mpeg_flush,
773 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
774 .hw_configs = (const AVCodecHWConfigInternal*[]) {
775 #if CONFIG_H263_VAAPI_HWACCEL
778 #if CONFIG_MPEG4_VDPAU_HWACCEL
779 HWACCEL_VDPAU(mpeg4),
781 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
782 HWACCEL_VIDEOTOOLBOX(h263),