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"
37 #include "mpeg4video.h"
38 #include "mpeg4video_parser.h"
39 #include "mpegvideo.h"
41 #include "vdpau_internal.h"
44 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
46 MpegEncContext *s = avctx->priv_data;
50 s->out_format = FMT_H263;
51 s->width = avctx->coded_width;
52 s->height = avctx->coded_height;
53 s->workaround_bugs = avctx->workaround_bugs;
56 ff_MPV_decode_defaults(s);
57 s->quant_precision = 5;
58 s->decode_mb = ff_h263_decode_mb;
60 if (avctx->codec->id == AV_CODEC_ID_MSS2)
61 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
63 avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
64 s->unrestricted_mv = 1;
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;
73 case AV_CODEC_ID_MPEG4:
75 case AV_CODEC_ID_MSMPEG4V1:
77 s->msmpeg4_version = 1;
79 case AV_CODEC_ID_MSMPEG4V2:
81 s->msmpeg4_version = 2;
83 case AV_CODEC_ID_MSMPEG4V3:
85 s->msmpeg4_version = 3;
87 case AV_CODEC_ID_WMV1:
89 s->msmpeg4_version = 4;
91 case AV_CODEC_ID_WMV2:
93 s->msmpeg4_version = 5;
96 case AV_CODEC_ID_WMV3:
97 case AV_CODEC_ID_VC1IMAGE:
98 case AV_CODEC_ID_WMV3IMAGE:
99 case AV_CODEC_ID_MSS2:
101 s->msmpeg4_version = 6;
102 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
104 case AV_CODEC_ID_H263I:
106 case AV_CODEC_ID_FLV1:
110 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
112 return AVERROR(ENOSYS);
114 s->codec_id = avctx->codec->id;
115 avctx->hwaccel = ff_find_hwaccel(avctx);
117 if (avctx->stream_codec_tag == AV_RL32("l263") && avctx->extradata_size == 56 && avctx->extradata[0] == 1)
120 /* for h263, we allocate the images after having read the header */
121 if (avctx->codec->id != AV_CODEC_ID_H263 &&
122 avctx->codec->id != AV_CODEC_ID_H263P &&
123 avctx->codec->id != AV_CODEC_ID_MPEG4)
124 if ((ret = ff_MPV_common_init(s)) < 0)
127 ff_h263dsp_init(&s->h263dsp);
128 ff_h263_decode_init_vlc();
133 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
135 MpegEncContext *s = avctx->priv_data;
137 ff_MPV_common_end(s);
142 * Return the number of bytes consumed for building the current frame.
144 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
146 int pos = (get_bits_count(&s->gb) + 7) >> 3;
148 if (s->divx_packed || s->avctx->hwaccel) {
149 /* We would have to scan through the whole buf to handle the weird
152 } else if (s->flags & CODEC_FLAG_TRUNCATED) {
153 pos -= s->parse_context.last_index;
154 // padding is not really read so this might be -1
159 // avoid infinite loops (maybe not needed...)
163 if (pos + 10 > buf_size)
170 static int decode_slice(MpegEncContext *s)
172 const int part_mask = s->partitioned_frame
173 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
174 const int mb_size = 16 >> s->avctx->lowres;
177 s->last_resync_gb = s->gb;
178 s->first_slice_line = 1;
179 s->resync_mb_x = s->mb_x;
180 s->resync_mb_y = s->mb_y;
182 ff_set_qscale(s, s->qscale);
184 if (s->avctx->hwaccel) {
185 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
186 ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
187 // ensure we exit decode loop
188 s->mb_y = s->mb_height;
192 if (s->partitioned_frame) {
193 const int qscale = s->qscale;
195 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
196 if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
199 /* restore variables which were modified */
200 s->first_slice_line = 1;
201 s->mb_x = s->resync_mb_x;
202 s->mb_y = s->resync_mb_y;
203 ff_set_qscale(s, qscale);
206 for (; s->mb_y < s->mb_height; s->mb_y++) {
207 /* per-row end of slice checks */
208 if (s->msmpeg4_version) {
209 if (s->resync_mb_y + s->slice_height == s->mb_y) {
210 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
211 s->mb_x - 1, s->mb_y, ER_MB_END);
217 if (s->msmpeg4_version == 1) {
223 ff_init_block_index(s);
224 for (; s->mb_x < s->mb_width; s->mb_x++) {
227 ff_update_block_index(s);
229 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
230 s->first_slice_line = 0;
234 s->mv_dir = MV_DIR_FORWARD;
235 s->mv_type = MV_TYPE_16X16;
236 // s->mb_skipped = 0;
237 av_dlog(s, "%d %d %06X\n",
238 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
239 ret = s->decode_mb(s, s->block);
241 if (s->pict_type != AV_PICTURE_TYPE_B)
242 ff_h263_update_motion_val(s);
245 const int xy = s->mb_x + s->mb_y * s->mb_stride;
246 if (ret == SLICE_END) {
247 ff_MPV_decode_mb(s, s->block);
249 ff_h263_loop_filter(s);
251 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
252 s->mb_x, s->mb_y, ER_MB_END & part_mask);
254 s->padding_bug_score--;
256 if (++s->mb_x >= s->mb_width) {
258 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
259 ff_MPV_report_decode_progress(s);
263 } else if (ret == SLICE_NOEND) {
264 av_log(s->avctx, AV_LOG_ERROR,
265 "Slice mismatch at MB: %d\n", xy);
266 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
267 s->mb_x + 1, s->mb_y,
268 ER_MB_END & part_mask);
269 return AVERROR_INVALIDDATA;
271 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
272 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
273 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
275 return AVERROR_INVALIDDATA;
278 ff_MPV_decode_mb(s, s->block);
280 ff_h263_loop_filter(s);
283 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
284 ff_MPV_report_decode_progress(s);
289 av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
291 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
292 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
293 get_bits_left(&s->gb) >= 48 &&
294 show_bits(&s->gb, 24) == 0x4010 &&
295 !s->data_partitioning)
296 s->padding_bug_score += 32;
298 /* try to detect the padding bug */
299 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
300 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
301 get_bits_left(&s->gb) >= 0 &&
302 get_bits_left(&s->gb) < 137 &&
303 // !s->resync_marker &&
304 !s->data_partitioning) {
305 const int bits_count = get_bits_count(&s->gb);
306 const int bits_left = s->gb.size_in_bits - bits_count;
308 if (bits_left == 0) {
309 s->padding_bug_score += 16;
310 } else if (bits_left != 1) {
311 int v = show_bits(&s->gb, 8);
312 v |= 0x7F >> (7 - (bits_count & 7));
314 if (v == 0x7F && bits_left <= 8)
315 s->padding_bug_score--;
316 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
318 s->padding_bug_score += 4;
320 s->padding_bug_score++;
324 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
325 if (s->padding_bug_score > -2 && !s->data_partitioning
326 /* && (s->divx_version >= 0 || !s->resync_marker) */)
327 s->workaround_bugs |= FF_BUG_NO_PADDING;
329 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
332 // handle formats which don't have unique end markers
333 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
334 int left = get_bits_left(&s->gb);
337 /* no markers in M$ crap */
338 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
341 /* buggy padding but the frame should still end approximately at
342 * the bitstream end */
343 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
344 (s->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
346 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
347 max_extra += 256 * 256 * 256 * 64;
349 if (left > max_extra)
350 av_log(s->avctx, AV_LOG_ERROR,
351 "discarding %d junk bits at end, next would be %X\n",
352 left, show_bits(&s->gb, 24));
354 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
356 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
357 s->mb_x - 1, s->mb_y, ER_MB_END);
362 av_log(s->avctx, AV_LOG_ERROR,
363 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
364 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
366 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
367 ER_MB_END & part_mask);
369 return AVERROR_INVALIDDATA;
372 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
375 const uint8_t *buf = avpkt->data;
376 int buf_size = avpkt->size;
377 MpegEncContext *s = avctx->priv_data;
380 AVFrame *pict = data;
382 s->flags = avctx->flags;
383 s->flags2 = avctx->flags2;
385 /* no supplementary picture */
387 /* special case for last picture */
388 if (s->low_delay == 0 && s->next_picture_ptr) {
389 if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
391 s->next_picture_ptr = NULL;
399 if (s->flags & CODEC_FLAG_TRUNCATED) {
402 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
403 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
404 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
405 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
406 } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
407 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
409 av_log(s->avctx, AV_LOG_ERROR,
410 "this codec does not support truncated bitstreams\n");
411 return AVERROR(ENOSYS);
414 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
420 if (s->divx_packed && s->bitstream_buffer_size) {
422 for(i=0; i < buf_size-3; i++) {
423 if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
424 if (buf[i+3]==0xB0) {
425 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
426 s->bitstream_buffer_size = 0;
433 if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
434 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
435 s->bitstream_buffer_size);
437 ret = init_get_bits8(&s->gb, buf, buf_size);
439 s->bitstream_buffer_size = 0;
443 if (!s->context_initialized)
444 // we need the idct permutaton for reading a custom matrix
445 if ((ret = ff_MPV_common_init(s)) < 0)
448 /* We need to set current_picture_ptr before reading the header,
449 * otherwise we cannot store anyting in there */
450 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
451 int i = ff_find_unused_picture(s, 0);
454 s->current_picture_ptr = &s->picture[i];
458 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
459 ret = ff_wmv2_decode_picture_header(s);
460 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
461 ret = ff_msmpeg4_decode_picture_header(s);
462 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
463 if (s->avctx->extradata_size && s->picture_number == 0) {
466 if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
467 ff_mpeg4_decode_picture_header(s, &gb);
469 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
470 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
471 ret = ff_intel_h263_decode_picture_header(s);
472 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
473 ret = ff_flv_decode_picture_header(s);
475 ret = ff_h263_decode_picture_header(s);
478 if (ret < 0 || ret == FRAME_SKIPPED) {
479 if ( s->width != avctx->coded_width
480 || s->height != avctx->coded_height) {
481 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
482 s->width = avctx->coded_width;
483 s->height= avctx->coded_height;
486 if (ret == FRAME_SKIPPED)
487 return get_consumed_bytes(s, buf_size);
489 /* skip if the header was thrashed */
491 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
495 avctx->has_b_frames = !s->low_delay;
497 if (s->xvid_build == -1 && s->divx_version == -1 && s->lavc_build == -1) {
498 if (s->stream_codec_tag == AV_RL32("XVID") ||
499 s->codec_tag == AV_RL32("XVID") ||
500 s->codec_tag == AV_RL32("XVIX") ||
501 s->codec_tag == AV_RL32("RMP4") ||
502 s->codec_tag == AV_RL32("ZMP4") ||
503 s->codec_tag == AV_RL32("SIPP"))
506 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
507 s->vol_control_parameters == 1 &&
508 s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
513 if (s->xvid_build == -1 && s->divx_version == -1 && s->lavc_build == -1)
514 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
515 s->vol_control_parameters == 0)
516 s->divx_version = 400; // divx 4
518 if (s->xvid_build >= 0 && s->divx_version >= 0) {
523 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
524 if (s->codec_tag == AV_RL32("XVIX"))
525 s->workaround_bugs |= FF_BUG_XVID_ILACE;
527 if (s->codec_tag == AV_RL32("UMP4"))
528 s->workaround_bugs |= FF_BUG_UMP4;
530 if (s->divx_version >= 500 && s->divx_build < 1814)
531 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
533 if (s->divx_version > 502 && s->divx_build < 1814)
534 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
536 if (s->xvid_build <= 3U)
537 s->padding_bug_score = 256 * 256 * 256 * 64;
539 if (s->xvid_build <= 1U)
540 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
542 if (s->xvid_build <= 12U)
543 s->workaround_bugs |= FF_BUG_EDGE;
545 if (s->xvid_build <= 32U)
546 s->workaround_bugs |= FF_BUG_DC_CLIP;
548 #define SET_QPEL_FUNC(postfix1, postfix2) \
549 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2; \
550 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
551 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
553 if (s->lavc_build < 4653U)
554 s->workaround_bugs |= FF_BUG_STD_QPEL;
556 if (s->lavc_build < 4655U)
557 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
559 if (s->lavc_build < 4670U)
560 s->workaround_bugs |= FF_BUG_EDGE;
562 if (s->lavc_build <= 4712U)
563 s->workaround_bugs |= FF_BUG_DC_CLIP;
565 if (s->divx_version >= 0)
566 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
567 if (s->divx_version == 501 && s->divx_build == 20020416)
568 s->padding_bug_score = 256 * 256 * 256 * 64;
570 if (s->divx_version < 500U)
571 s->workaround_bugs |= FF_BUG_EDGE;
573 if (s->divx_version >= 0)
574 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
576 if (s->divx_version == 500)
577 s->padding_bug_score = 256 * 256 * 256 * 64;
579 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
580 * Let us hope this at least works. */
581 if (s->resync_marker == 0 && s->data_partitioning == 0 &&
582 s->divx_version == -1 && s->codec_id == AV_CODEC_ID_MPEG4 &&
584 s->workaround_bugs |= FF_BUG_NO_PADDING;
586 // FIXME not sure about the version num but a 4609 file seems ok
587 if (s->lavc_build < 4609U)
588 s->workaround_bugs |= FF_BUG_NO_PADDING;
592 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
593 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
594 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
595 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
596 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
597 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
598 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
600 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
601 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
602 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
603 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
604 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
605 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
608 if (avctx->debug & FF_DEBUG_BUGS)
609 av_log(s->avctx, AV_LOG_DEBUG,
610 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
611 s->workaround_bugs, s->lavc_build, s->xvid_build,
612 s->divx_version, s->divx_build, s->divx_packed ? "p" : "");
615 if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build >= 0 &&
616 avctx->idct_algo == FF_IDCT_AUTO &&
617 (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
618 avctx->idct_algo = FF_IDCT_XVIDMMX;
619 ff_dct_common_init(s);
624 /* After H263 & mpeg4 header decode we have the height, width,
625 * and other parameters. So then we could init the picture.
626 * FIXME: By the way H263 decoder is evolving it should have
627 * an H263EncContext */
628 if (s->width != avctx->coded_width ||
629 s->height != avctx->coded_height ||
631 /* H.263 could change picture size any time */
632 s->context_reinit = 0;
634 ret = ff_set_dimensions(avctx, s->width, s->height);
638 if ((ret = ff_MPV_common_frame_size_change(s)))
642 if (s->codec_id == AV_CODEC_ID_H263 ||
643 s->codec_id == AV_CODEC_ID_H263P ||
644 s->codec_id == AV_CODEC_ID_H263I)
645 s->gob_index = ff_h263_get_gob_height(s);
647 // for skipping the frame
648 s->current_picture.f.pict_type = s->pict_type;
649 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
651 /* skip B-frames if we don't have reference frames */
652 if (s->last_picture_ptr == NULL &&
653 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
654 return get_consumed_bytes(s, buf_size);
655 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
656 s->pict_type == AV_PICTURE_TYPE_B) ||
657 (avctx->skip_frame >= AVDISCARD_NONKEY &&
658 s->pict_type != AV_PICTURE_TYPE_I) ||
659 avctx->skip_frame >= AVDISCARD_ALL)
660 return get_consumed_bytes(s, buf_size);
662 if (s->next_p_frame_damaged) {
663 if (s->pict_type == AV_PICTURE_TYPE_B)
664 return get_consumed_bytes(s, buf_size);
666 s->next_p_frame_damaged = 0;
669 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
670 s->me.qpel_put = s->dsp.put_qpel_pixels_tab;
671 s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;
673 s->me.qpel_put = s->dsp.put_no_rnd_qpel_pixels_tab;
674 s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;
677 if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
680 if (!s->divx_packed && !avctx->hwaccel)
681 ff_thread_finish_setup(avctx);
683 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
684 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
688 if (avctx->hwaccel) {
689 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
690 s->gb.buffer_end - s->gb.buffer);
695 ff_mpeg_er_frame_start(s);
697 /* the second part of the wmv2 header contains the MB skip bits which
698 * are stored in current_picture->mb_type which is not available before
699 * ff_MPV_frame_start() */
700 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
701 ret = ff_wmv2_decode_secondary_picture_header(s);
708 /* decode each macroblock */
712 slice_ret = decode_slice(s);
713 while (s->mb_y < s->mb_height) {
714 if (s->msmpeg4_version) {
715 if (s->slice_height == 0 || s->mb_x != 0 ||
716 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
719 int prev_x = s->mb_x, prev_y = s->mb_y;
720 if (ff_h263_resync(s) < 0)
722 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
723 s->er.error_occurred = 1;
726 if (s->msmpeg4_version < 4 && s->h263_pred)
727 ff_mpeg4_clean_buffers(s);
729 if (decode_slice(s) < 0)
730 slice_ret = AVERROR_INVALIDDATA;
733 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
734 s->pict_type == AV_PICTURE_TYPE_I)
735 if (!CONFIG_MSMPEG4_DECODER ||
736 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
737 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
739 av_assert1(s->bitstream_buffer_size == 0);
741 ff_er_frame_end(&s->er);
743 if (avctx->hwaccel) {
744 ret = avctx->hwaccel->end_frame(avctx);
751 /* divx 5.01+ bitstream reorder stuff */
752 /* Since this clobbers the input buffer and hwaccel codecs still need the
753 * data during hwaccel->end_frame we should not do this any earlier */
754 if (s->codec_id == AV_CODEC_ID_MPEG4 && s->divx_packed) {
755 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
756 int startcode_found = 0;
758 if (buf_size - current_pos > 7) {
760 for (i = current_pos; i < buf_size - 4; i++)
764 buf[i + 3] == 0xB6) {
765 startcode_found = !(buf[i + 4] & 0x40);
770 if (startcode_found) {
771 av_fast_malloc(&s->bitstream_buffer,
772 &s->allocated_bitstream_buffer_size,
773 buf_size - current_pos +
774 FF_INPUT_BUFFER_PADDING_SIZE);
775 if (!s->bitstream_buffer)
776 return AVERROR(ENOMEM);
777 memcpy(s->bitstream_buffer, buf + current_pos,
778 buf_size - current_pos);
779 s->bitstream_buffer_size = buf_size - current_pos;
783 if (!s->divx_packed && avctx->hwaccel)
784 ff_thread_finish_setup(avctx);
786 av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
787 av_assert1(s->current_picture.f.pict_type == s->pict_type);
788 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
789 if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
791 ff_print_debug_info(s, s->current_picture_ptr, pict);
792 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
793 } else if (s->last_picture_ptr != NULL) {
794 if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
796 ff_print_debug_info(s, s->last_picture_ptr, pict);
797 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
800 if (s->last_picture_ptr || s->low_delay) {
801 if ( pict->format == AV_PIX_FMT_YUV420P
802 && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
804 av_frame_make_writable(pict);
805 for (p=0; p<3; p++) {
806 int w = FF_CEIL_RSHIFT(pict-> width, !!p);
807 int h = FF_CEIL_RSHIFT(pict->height, !!p);
808 int linesize = pict->linesize[p];
809 for (y=0; y<(h>>1); y++)
812 pict->data[p][x + y*linesize],
813 pict->data[p][x + (h-1-y)*linesize]);
819 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
822 return get_consumed_bytes(s, buf_size);
825 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
827 AV_PIX_FMT_VAAPI_VLD,
836 AVCodec ff_h263_decoder = {
838 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
839 .type = AVMEDIA_TYPE_VIDEO,
840 .id = AV_CODEC_ID_H263,
841 .priv_data_size = sizeof(MpegEncContext),
842 .init = ff_h263_decode_init,
843 .close = ff_h263_decode_end,
844 .decode = ff_h263_decode_frame,
845 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
846 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
847 .flush = ff_mpeg_flush,
849 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
852 AVCodec ff_h263p_decoder = {
854 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
855 .type = AVMEDIA_TYPE_VIDEO,
856 .id = AV_CODEC_ID_H263P,
857 .priv_data_size = sizeof(MpegEncContext),
858 .init = ff_h263_decode_init,
859 .close = ff_h263_decode_end,
860 .decode = ff_h263_decode_frame,
861 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
862 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
863 .flush = ff_mpeg_flush,
865 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,