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"
36 #include "mpeg4video.h"
37 #include "mpeg4video_parser.h"
38 #include "mpegvideo.h"
43 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
45 MpegEncContext *s = avctx->priv_data;
49 s->out_format = FMT_H263;
50 s->width = avctx->coded_width;
51 s->height = avctx->coded_height;
52 s->workaround_bugs = avctx->workaround_bugs;
55 ff_mpv_decode_defaults(s);
56 s->quant_precision = 5;
57 s->decode_mb = ff_h263_decode_mb;
59 if (avctx->codec->id == AV_CODEC_ID_MSS2)
60 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
62 avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
63 s->unrestricted_mv = 1;
65 /* select sub codec */
66 switch (avctx->codec->id) {
67 case AV_CODEC_ID_H263:
68 s->unrestricted_mv = 0;
69 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
71 case AV_CODEC_ID_MPEG4:
73 case AV_CODEC_ID_MSMPEG4V1:
75 s->msmpeg4_version = 1;
77 case AV_CODEC_ID_MSMPEG4V2:
79 s->msmpeg4_version = 2;
81 case AV_CODEC_ID_MSMPEG4V3:
83 s->msmpeg4_version = 3;
85 case AV_CODEC_ID_WMV1:
87 s->msmpeg4_version = 4;
89 case AV_CODEC_ID_WMV2:
91 s->msmpeg4_version = 5;
94 case AV_CODEC_ID_WMV3:
95 case AV_CODEC_ID_VC1IMAGE:
96 case AV_CODEC_ID_WMV3IMAGE:
97 case AV_CODEC_ID_MSS2:
99 s->msmpeg4_version = 6;
100 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
102 case AV_CODEC_ID_H263I:
104 case AV_CODEC_ID_FLV1:
108 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
110 return AVERROR(ENOSYS);
112 s->codec_id = avctx->codec->id;
114 /* for h263, we allocate the images after having read the header */
115 if (avctx->codec->id != AV_CODEC_ID_H263 &&
116 avctx->codec->id != AV_CODEC_ID_MPEG4) {
118 if ((ret = ff_mpv_common_init(s)) < 0)
122 ff_h263dsp_init(&s->h263dsp);
123 ff_qpeldsp_init(&s->qdsp);
124 ff_h263_decode_init_vlc();
129 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
131 MpegEncContext *s = avctx->priv_data;
133 ff_mpv_common_end(s);
138 * Return the number of bytes consumed for building the current frame.
140 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
142 int pos = (get_bits_count(&s->gb) + 7) >> 3;
144 if (s->divx_packed || s->avctx->hwaccel) {
145 /* We would have to scan through the whole buf to handle the weird
148 } else if (s->flags & CODEC_FLAG_TRUNCATED) {
149 pos -= s->parse_context.last_index;
150 // padding is not really read so this might be -1
155 // avoid infinite loops (maybe not needed...)
159 if (pos + 10 > buf_size)
166 static int decode_slice(MpegEncContext *s)
168 const int part_mask = s->partitioned_frame
169 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
170 const int mb_size = 16;
173 s->last_resync_gb = s->gb;
174 s->first_slice_line = 1;
175 s->resync_mb_x = s->mb_x;
176 s->resync_mb_y = s->mb_y;
178 ff_set_qscale(s, s->qscale);
180 if (s->avctx->hwaccel) {
181 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
182 const uint8_t *end = ff_h263_find_resync_marker(start + 1,
184 skip_bits_long(&s->gb, 8 * (end - start));
185 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
188 if (s->partitioned_frame) {
189 const int qscale = s->qscale;
191 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
192 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
195 /* restore variables which were modified */
196 s->first_slice_line = 1;
197 s->mb_x = s->resync_mb_x;
198 s->mb_y = s->resync_mb_y;
199 ff_set_qscale(s, qscale);
202 for (; s->mb_y < s->mb_height; s->mb_y++) {
203 /* per-row end of slice checks */
204 if (s->msmpeg4_version) {
205 if (s->resync_mb_y + s->slice_height == s->mb_y) {
206 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
207 s->mb_x - 1, s->mb_y, ER_MB_END);
213 if (s->msmpeg4_version == 1) {
219 ff_init_block_index(s);
220 for (; s->mb_x < s->mb_width; s->mb_x++) {
223 ff_update_block_index(s);
225 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
226 s->first_slice_line = 0;
230 s->mv_dir = MV_DIR_FORWARD;
231 s->mv_type = MV_TYPE_16X16;
232 av_dlog(s, "%d %d %06X\n",
233 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
234 ret = s->decode_mb(s, s->block);
236 if (s->pict_type != AV_PICTURE_TYPE_B)
237 ff_h263_update_motion_val(s);
240 const int xy = s->mb_x + s->mb_y * s->mb_stride;
241 if (ret == SLICE_END) {
242 ff_mpv_decode_mb(s, s->block);
244 ff_h263_loop_filter(s);
246 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
247 s->mb_x, s->mb_y, ER_MB_END & part_mask);
249 s->padding_bug_score--;
251 if (++s->mb_x >= s->mb_width) {
253 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
254 ff_mpv_report_decode_progress(s);
258 } else if (ret == SLICE_NOEND) {
259 av_log(s->avctx, AV_LOG_ERROR,
260 "Slice mismatch at MB: %d\n", xy);
261 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
262 s->mb_x + 1, s->mb_y,
263 ER_MB_END & part_mask);
264 return AVERROR_INVALIDDATA;
266 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
267 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
268 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
270 return AVERROR_INVALIDDATA;
273 ff_mpv_decode_mb(s, s->block);
275 ff_h263_loop_filter(s);
278 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
279 ff_mpv_report_decode_progress(s);
284 assert(s->mb_x == 0 && s->mb_y == s->mb_height);
286 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
287 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
288 get_bits_left(&s->gb) >= 48 &&
289 show_bits(&s->gb, 24) == 0x4010 &&
290 !s->data_partitioning)
291 s->padding_bug_score += 32;
293 /* try to detect the padding bug */
294 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
295 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
296 get_bits_left(&s->gb) >= 0 &&
297 get_bits_left(&s->gb) < 48 &&
298 !s->data_partitioning) {
299 const int bits_count = get_bits_count(&s->gb);
300 const int bits_left = s->gb.size_in_bits - bits_count;
302 if (bits_left == 0) {
303 s->padding_bug_score += 16;
304 } else if (bits_left != 1) {
305 int v = show_bits(&s->gb, 8);
306 v |= 0x7F >> (7 - (bits_count & 7));
308 if (v == 0x7F && bits_left <= 8)
309 s->padding_bug_score--;
310 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
312 s->padding_bug_score += 4;
314 s->padding_bug_score++;
318 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
319 if (s->padding_bug_score > -2 && !s->data_partitioning)
320 s->workaround_bugs |= FF_BUG_NO_PADDING;
322 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
325 // handle formats which don't have unique end markers
326 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
327 int left = get_bits_left(&s->gb);
330 /* no markers in M$ crap */
331 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
334 /* buggy padding but the frame should still end approximately at
335 * the bitstream end */
336 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
337 (s->err_recognition & AV_EF_BUFFER))
339 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
340 max_extra += 256 * 256 * 256 * 64;
342 if (left > max_extra)
343 av_log(s->avctx, AV_LOG_ERROR,
344 "discarding %d junk bits at end, next would be %X\n",
345 left, show_bits(&s->gb, 24));
347 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
349 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
350 s->mb_x - 1, s->mb_y, ER_MB_END);
355 av_log(s->avctx, AV_LOG_ERROR,
356 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
357 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
359 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
360 ER_MB_END & part_mask);
362 return AVERROR_INVALIDDATA;
365 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
368 const uint8_t *buf = avpkt->data;
369 int buf_size = avpkt->size;
370 MpegEncContext *s = avctx->priv_data;
372 AVFrame *pict = data;
374 s->flags = avctx->flags;
375 s->flags2 = avctx->flags2;
377 /* no supplementary picture */
379 /* special case for last picture */
380 if (s->low_delay == 0 && s->next_picture_ptr) {
381 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
383 s->next_picture_ptr = NULL;
391 if (s->flags & CODEC_FLAG_TRUNCATED) {
394 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
395 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
396 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
397 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
399 av_log(s->avctx, AV_LOG_ERROR,
400 "this codec does not support truncated bitstreams\n");
401 return AVERROR(ENOSYS);
404 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
409 if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
410 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
411 s->bitstream_buffer_size);
413 ret = init_get_bits8(&s->gb, buf, buf_size);
414 s->bitstream_buffer_size = 0;
419 if (!s->context_initialized)
420 // we need the idct permutaton for reading a custom matrix
424 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
425 ret = ff_wmv2_decode_picture_header(s);
426 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
427 ret = ff_msmpeg4_decode_picture_header(s);
428 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
429 if (s->avctx->extradata_size && s->picture_number == 0) {
432 ret = init_get_bits8(&gb, s->avctx->extradata,
433 s->avctx->extradata_size);
436 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb);
438 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
439 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
440 ret = ff_intel_h263_decode_picture_header(s);
441 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
442 ret = ff_flv_decode_picture_header(s);
444 ret = ff_h263_decode_picture_header(s);
447 if (ret == FRAME_SKIPPED)
448 return get_consumed_bytes(s, buf_size);
450 /* skip if the header was thrashed */
452 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
456 if (!s->context_initialized)
457 if ((ret = ff_mpv_common_init(s)) < 0)
460 if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
461 int i = ff_find_unused_picture(s, 0);
464 s->current_picture_ptr = &s->picture[i];
467 avctx->has_b_frames = !s->low_delay;
469 #define SET_QPEL_FUNC(postfix1, postfix2) \
470 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
471 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
472 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
474 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
475 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
476 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
477 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
478 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
479 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
480 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
482 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
483 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
484 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
485 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
486 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
487 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
490 /* After H263 & mpeg4 header decode we have the height, width,
491 * and other parameters. So then we could init the picture.
492 * FIXME: By the way H263 decoder is evolving it should have
493 * an H263EncContext */
494 if (s->width != avctx->coded_width ||
495 s->height != avctx->coded_height ||
497 /* H.263 could change picture size any time */
498 s->context_reinit = 0;
500 ret = ff_set_dimensions(avctx, s->width, s->height);
504 ff_set_sar(avctx, avctx->sample_aspect_ratio);
506 if ((ret = ff_mpv_common_frame_size_change(s)))
510 if (s->codec_id == AV_CODEC_ID_H263 ||
511 s->codec_id == AV_CODEC_ID_H263P ||
512 s->codec_id == AV_CODEC_ID_H263I)
513 s->gob_index = ff_h263_get_gob_height(s);
515 // for skipping the frame
516 s->current_picture.f->pict_type = s->pict_type;
517 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
519 /* skip B-frames if we don't have reference frames */
520 if (!s->last_picture_ptr &&
521 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
522 return get_consumed_bytes(s, buf_size);
523 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
524 s->pict_type == AV_PICTURE_TYPE_B) ||
525 (avctx->skip_frame >= AVDISCARD_NONKEY &&
526 s->pict_type != AV_PICTURE_TYPE_I) ||
527 avctx->skip_frame >= AVDISCARD_ALL)
528 return get_consumed_bytes(s, buf_size);
530 if (s->next_p_frame_damaged) {
531 if (s->pict_type == AV_PICTURE_TYPE_B)
532 return get_consumed_bytes(s, buf_size);
534 s->next_p_frame_damaged = 0;
537 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
538 s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
539 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
541 s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
542 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
545 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
548 if (!s->divx_packed && !avctx->hwaccel)
549 ff_thread_finish_setup(avctx);
551 if (avctx->hwaccel) {
552 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
553 s->gb.buffer_end - s->gb.buffer);
558 ff_mpeg_er_frame_start(s);
560 /* the second part of the wmv2 header contains the MB skip bits which
561 * are stored in current_picture->mb_type which is not available before
562 * ff_mpv_frame_start() */
563 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
564 ret = ff_wmv2_decode_secondary_picture_header(s);
568 goto intrax8_decoded;
571 /* decode each macroblock */
575 ret = decode_slice(s);
576 while (s->mb_y < s->mb_height) {
577 if (s->msmpeg4_version) {
578 if (s->slice_height == 0 || s->mb_x != 0 ||
579 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
582 int prev_x = s->mb_x, prev_y = s->mb_y;
583 if (ff_h263_resync(s) < 0)
585 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
586 s->er.error_occurred = 1;
589 if (s->msmpeg4_version < 4 && s->h263_pred)
590 ff_mpeg4_clean_buffers(s);
592 if (decode_slice(s) < 0)
593 ret = AVERROR_INVALIDDATA;
596 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
597 s->pict_type == AV_PICTURE_TYPE_I)
598 if (!CONFIG_MSMPEG4_DECODER ||
599 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
600 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
602 assert(s->bitstream_buffer_size == 0);
604 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
605 ff_mpeg4_frame_end(avctx, buf, buf_size);
608 ff_er_frame_end(&s->er);
610 if (avctx->hwaccel) {
611 ret = avctx->hwaccel->end_frame(avctx);
618 if (!s->divx_packed && avctx->hwaccel)
619 ff_thread_finish_setup(avctx);
621 assert(s->current_picture.f->pict_type ==
622 s->current_picture_ptr->f->pict_type);
623 assert(s->current_picture.f->pict_type == s->pict_type);
624 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
625 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
627 ff_print_debug_info(s, s->current_picture_ptr);
628 } else if (s->last_picture_ptr) {
629 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
631 ff_print_debug_info(s, s->last_picture_ptr);
634 if (s->last_picture_ptr || s->low_delay)
637 if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
640 return get_consumed_bytes(s, buf_size);
643 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
644 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
645 AV_PIX_FMT_VAAPI_VLD,
647 #if CONFIG_H263_VDPAU_HWACCEL || CONFIG_MPEG4_VDPAU_HWACCEL
654 AVCodec ff_h263_decoder = {
656 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
657 .type = AVMEDIA_TYPE_VIDEO,
658 .id = AV_CODEC_ID_H263,
659 .priv_data_size = sizeof(MpegEncContext),
660 .init = ff_h263_decode_init,
661 .close = ff_h263_decode_end,
662 .decode = ff_h263_decode_frame,
663 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
664 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
665 .flush = ff_mpeg_flush,
666 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,