3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
8 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "libavutil/cpu.h"
30 #include "error_resilience.h"
33 #include "h263_parser.h"
35 #include "mpeg4video.h"
36 #include "mpeg4video_parser.h"
37 #include "mpegvideo.h"
42 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
44 MpegEncContext *s = avctx->priv_data;
48 s->out_format = FMT_H263;
49 s->width = avctx->coded_width;
50 s->height = avctx->coded_height;
51 s->workaround_bugs = avctx->workaround_bugs;
54 ff_MPV_decode_defaults(s);
55 s->quant_precision = 5;
56 s->decode_mb = ff_h263_decode_mb;
58 if (avctx->codec->id == AV_CODEC_ID_MSS2)
59 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
61 avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
62 s->unrestricted_mv = 1;
64 /* select sub codec */
65 switch (avctx->codec->id) {
66 case AV_CODEC_ID_H263:
67 s->unrestricted_mv = 0;
68 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
70 case AV_CODEC_ID_MPEG4:
72 case AV_CODEC_ID_MSMPEG4V1:
74 s->msmpeg4_version = 1;
76 case AV_CODEC_ID_MSMPEG4V2:
78 s->msmpeg4_version = 2;
80 case AV_CODEC_ID_MSMPEG4V3:
82 s->msmpeg4_version = 3;
84 case AV_CODEC_ID_WMV1:
86 s->msmpeg4_version = 4;
88 case AV_CODEC_ID_WMV2:
90 s->msmpeg4_version = 5;
93 case AV_CODEC_ID_WMV3:
94 case AV_CODEC_ID_VC1IMAGE:
95 case AV_CODEC_ID_WMV3IMAGE:
96 case AV_CODEC_ID_MSS2:
98 s->msmpeg4_version = 6;
99 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
101 case AV_CODEC_ID_H263I:
103 case AV_CODEC_ID_FLV1:
107 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
109 return AVERROR(ENOSYS);
111 s->codec_id = avctx->codec->id;
113 /* for h263, we allocate the images after having read the header */
114 if (avctx->codec->id != AV_CODEC_ID_H263 &&
115 avctx->codec->id != AV_CODEC_ID_MPEG4)
116 if ((ret = ff_MPV_common_init(s)) < 0)
119 ff_h263dsp_init(&s->h263dsp);
120 ff_qpeldsp_init(&s->qdsp);
121 ff_h263_decode_init_vlc();
126 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
128 MpegEncContext *s = avctx->priv_data;
130 ff_MPV_common_end(s);
135 * Return the number of bytes consumed for building the current frame.
137 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
139 int pos = (get_bits_count(&s->gb) + 7) >> 3;
141 if (s->divx_packed || s->avctx->hwaccel) {
142 /* We would have to scan through the whole buf to handle the weird
145 } else if (s->flags & CODEC_FLAG_TRUNCATED) {
146 pos -= s->parse_context.last_index;
147 // padding is not really read so this might be -1
152 // avoid infinite loops (maybe not needed...)
156 if (pos + 10 > buf_size)
163 static int decode_slice(MpegEncContext *s)
165 const int part_mask = s->partitioned_frame
166 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
167 const int mb_size = 16;
170 s->last_resync_gb = s->gb;
171 s->first_slice_line = 1;
172 s->resync_mb_x = s->mb_x;
173 s->resync_mb_y = s->mb_y;
175 ff_set_qscale(s, s->qscale);
177 if (s->avctx->hwaccel) {
178 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
179 const uint8_t *end = ff_h263_find_resync_marker(start + 1,
181 skip_bits_long(&s->gb, 8 * (end - start));
182 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
185 if (s->partitioned_frame) {
186 const int qscale = s->qscale;
188 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
189 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
192 /* restore variables which were modified */
193 s->first_slice_line = 1;
194 s->mb_x = s->resync_mb_x;
195 s->mb_y = s->resync_mb_y;
196 ff_set_qscale(s, qscale);
199 for (; s->mb_y < s->mb_height; s->mb_y++) {
200 /* per-row end of slice checks */
201 if (s->msmpeg4_version) {
202 if (s->resync_mb_y + s->slice_height == s->mb_y) {
203 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
204 s->mb_x - 1, s->mb_y, ER_MB_END);
210 if (s->msmpeg4_version == 1) {
216 ff_init_block_index(s);
217 for (; s->mb_x < s->mb_width; s->mb_x++) {
220 ff_update_block_index(s);
222 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
223 s->first_slice_line = 0;
227 s->mv_dir = MV_DIR_FORWARD;
228 s->mv_type = MV_TYPE_16X16;
229 av_dlog(s, "%d %d %06X\n",
230 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
231 ret = s->decode_mb(s, s->block);
233 if (s->pict_type != AV_PICTURE_TYPE_B)
234 ff_h263_update_motion_val(s);
237 const int xy = s->mb_x + s->mb_y * s->mb_stride;
238 if (ret == SLICE_END) {
239 ff_MPV_decode_mb(s, s->block);
241 ff_h263_loop_filter(s);
243 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
244 s->mb_x, s->mb_y, ER_MB_END & part_mask);
246 s->padding_bug_score--;
248 if (++s->mb_x >= s->mb_width) {
250 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
251 ff_MPV_report_decode_progress(s);
255 } else if (ret == SLICE_NOEND) {
256 av_log(s->avctx, AV_LOG_ERROR,
257 "Slice mismatch at MB: %d\n", xy);
258 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
259 s->mb_x + 1, s->mb_y,
260 ER_MB_END & part_mask);
261 return AVERROR_INVALIDDATA;
263 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
264 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
265 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
267 return AVERROR_INVALIDDATA;
270 ff_MPV_decode_mb(s, s->block);
272 ff_h263_loop_filter(s);
275 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
276 ff_MPV_report_decode_progress(s);
281 assert(s->mb_x == 0 && s->mb_y == s->mb_height);
283 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
284 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
285 get_bits_left(&s->gb) >= 48 &&
286 show_bits(&s->gb, 24) == 0x4010 &&
287 !s->data_partitioning)
288 s->padding_bug_score += 32;
290 /* try to detect the padding bug */
291 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
292 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
293 get_bits_left(&s->gb) >= 0 &&
294 get_bits_left(&s->gb) < 48 &&
295 !s->data_partitioning) {
296 const int bits_count = get_bits_count(&s->gb);
297 const int bits_left = s->gb.size_in_bits - bits_count;
299 if (bits_left == 0) {
300 s->padding_bug_score += 16;
301 } else if (bits_left != 1) {
302 int v = show_bits(&s->gb, 8);
303 v |= 0x7F >> (7 - (bits_count & 7));
305 if (v == 0x7F && bits_left <= 8)
306 s->padding_bug_score--;
307 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
309 s->padding_bug_score += 4;
311 s->padding_bug_score++;
315 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
316 if (s->padding_bug_score > -2 && !s->data_partitioning)
317 s->workaround_bugs |= FF_BUG_NO_PADDING;
319 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
322 // handle formats which don't have unique end markers
323 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
324 int left = get_bits_left(&s->gb);
327 /* no markers in M$ crap */
328 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
331 /* buggy padding but the frame should still end approximately at
332 * the bitstream end */
333 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
334 (s->err_recognition & AV_EF_BUFFER))
336 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
337 max_extra += 256 * 256 * 256 * 64;
339 if (left > max_extra)
340 av_log(s->avctx, AV_LOG_ERROR,
341 "discarding %d junk bits at end, next would be %X\n",
342 left, show_bits(&s->gb, 24));
344 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
346 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
347 s->mb_x - 1, s->mb_y, ER_MB_END);
352 av_log(s->avctx, AV_LOG_ERROR,
353 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
354 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
356 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
357 ER_MB_END & part_mask);
359 return AVERROR_INVALIDDATA;
362 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
365 const uint8_t *buf = avpkt->data;
366 int buf_size = avpkt->size;
367 MpegEncContext *s = avctx->priv_data;
369 AVFrame *pict = data;
371 s->flags = avctx->flags;
372 s->flags2 = avctx->flags2;
374 /* no supplementary picture */
376 /* special case for last picture */
377 if (s->low_delay == 0 && s->next_picture_ptr) {
378 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
380 s->next_picture_ptr = NULL;
388 if (s->flags & CODEC_FLAG_TRUNCATED) {
391 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
392 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
393 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
394 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
396 av_log(s->avctx, AV_LOG_ERROR,
397 "this codec does not support truncated bitstreams\n");
398 return AVERROR(ENOSYS);
401 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
406 if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
407 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
408 s->bitstream_buffer_size);
410 ret = init_get_bits8(&s->gb, buf, buf_size);
411 s->bitstream_buffer_size = 0;
416 if (!s->context_initialized)
417 // we need the idct permutaton for reading a custom matrix
418 if ((ret = ff_MPV_common_init(s)) < 0)
421 /* We need to set current_picture_ptr before reading the header,
422 * otherwise we cannot store anyting in there */
423 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f->data[0]) {
424 int i = ff_find_unused_picture(s, 0);
427 s->current_picture_ptr = &s->picture[i];
431 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
432 ret = ff_wmv2_decode_picture_header(s);
433 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
434 ret = ff_msmpeg4_decode_picture_header(s);
435 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
436 if (s->avctx->extradata_size && s->picture_number == 0) {
439 ret = init_get_bits8(&gb, s->avctx->extradata,
440 s->avctx->extradata_size);
443 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb);
445 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
446 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
447 ret = ff_intel_h263_decode_picture_header(s);
448 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
449 ret = ff_flv_decode_picture_header(s);
451 ret = ff_h263_decode_picture_header(s);
454 if (ret == FRAME_SKIPPED)
455 return get_consumed_bytes(s, buf_size);
457 /* skip if the header was thrashed */
459 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
463 avctx->has_b_frames = !s->low_delay;
465 #define SET_QPEL_FUNC(postfix1, postfix2) \
466 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
467 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
468 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
470 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
471 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
472 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
473 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
474 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
475 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
476 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
478 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
479 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
480 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
481 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
482 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
483 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
486 /* After H263 & mpeg4 header decode we have the height, width,
487 * and other parameters. So then we could init the picture.
488 * FIXME: By the way H263 decoder is evolving it should have
489 * an H263EncContext */
490 if (s->width != avctx->coded_width ||
491 s->height != avctx->coded_height ||
493 /* H.263 could change picture size any time */
494 s->context_reinit = 0;
496 ret = ff_set_dimensions(avctx, s->width, s->height);
500 ff_set_sar(avctx, avctx->sample_aspect_ratio);
502 if ((ret = ff_MPV_common_frame_size_change(s)))
506 if (s->codec_id == AV_CODEC_ID_H263 ||
507 s->codec_id == AV_CODEC_ID_H263P ||
508 s->codec_id == AV_CODEC_ID_H263I)
509 s->gob_index = ff_h263_get_gob_height(s);
511 // for skipping the frame
512 s->current_picture.f->pict_type = s->pict_type;
513 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
515 /* skip B-frames if we don't have reference frames */
516 if (s->last_picture_ptr == NULL &&
517 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
518 return get_consumed_bytes(s, buf_size);
519 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
520 s->pict_type == AV_PICTURE_TYPE_B) ||
521 (avctx->skip_frame >= AVDISCARD_NONKEY &&
522 s->pict_type != AV_PICTURE_TYPE_I) ||
523 avctx->skip_frame >= AVDISCARD_ALL)
524 return get_consumed_bytes(s, buf_size);
526 if (s->next_p_frame_damaged) {
527 if (s->pict_type == AV_PICTURE_TYPE_B)
528 return get_consumed_bytes(s, buf_size);
530 s->next_p_frame_damaged = 0;
533 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
534 s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
535 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
537 s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
538 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
541 if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
544 if (!s->divx_packed && !avctx->hwaccel)
545 ff_thread_finish_setup(avctx);
547 if (avctx->hwaccel) {
548 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
549 s->gb.buffer_end - s->gb.buffer);
554 ff_mpeg_er_frame_start(s);
556 /* the second part of the wmv2 header contains the MB skip bits which
557 * are stored in current_picture->mb_type which is not available before
558 * ff_MPV_frame_start() */
559 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
560 ret = ff_wmv2_decode_secondary_picture_header(s);
564 goto intrax8_decoded;
567 /* decode each macroblock */
571 ret = decode_slice(s);
572 while (s->mb_y < s->mb_height) {
573 if (s->msmpeg4_version) {
574 if (s->slice_height == 0 || s->mb_x != 0 ||
575 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
578 int prev_x = s->mb_x, prev_y = s->mb_y;
579 if (ff_h263_resync(s) < 0)
581 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
582 s->er.error_occurred = 1;
585 if (s->msmpeg4_version < 4 && s->h263_pred)
586 ff_mpeg4_clean_buffers(s);
588 if (decode_slice(s) < 0)
589 ret = AVERROR_INVALIDDATA;
592 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
593 s->pict_type == AV_PICTURE_TYPE_I)
594 if (!CONFIG_MSMPEG4_DECODER ||
595 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
596 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
598 assert(s->bitstream_buffer_size == 0);
600 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
601 ff_mpeg4_frame_end(avctx, buf, buf_size);
604 ff_er_frame_end(&s->er);
606 if (avctx->hwaccel) {
607 ret = avctx->hwaccel->end_frame(avctx);
614 if (!s->divx_packed && avctx->hwaccel)
615 ff_thread_finish_setup(avctx);
617 assert(s->current_picture.f->pict_type ==
618 s->current_picture_ptr->f->pict_type);
619 assert(s->current_picture.f->pict_type == s->pict_type);
620 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
621 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
623 ff_print_debug_info(s, s->current_picture_ptr);
624 } else if (s->last_picture_ptr != NULL) {
625 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
627 ff_print_debug_info(s, s->last_picture_ptr);
630 if (s->last_picture_ptr || s->low_delay)
633 if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
636 return get_consumed_bytes(s, buf_size);
639 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
640 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
641 AV_PIX_FMT_VAAPI_VLD,
643 #if CONFIG_H263_VDPAU_HWACCEL || CONFIG_MPEG4_VDPAU_HWACCEL
650 AVCodec ff_h263_decoder = {
652 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
653 .type = AVMEDIA_TYPE_VIDEO,
654 .id = AV_CODEC_ID_H263,
655 .priv_data_size = sizeof(MpegEncContext),
656 .init = ff_h263_decode_init,
657 .close = ff_h263_decode_end,
658 .decode = ff_h263_decode_frame,
659 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
660 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
661 .flush = ff_mpeg_flush,
662 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,