2 * various utility functions for use within FFmpeg
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "libavutil/avassert.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/dict.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/mathematics.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/parseutils.h"
36 #include "libavutil/pixdesc.h"
37 #include "libavutil/time.h"
38 #include "libavutil/timestamp.h"
40 #include "libavcodec/bytestream.h"
41 #include "libavcodec/internal.h"
42 #include "libavcodec/raw.h"
44 #include "audiointerleave.h"
46 #include "avio_internal.h"
58 * various utility functions for use within FFmpeg
61 unsigned avformat_version(void)
63 av_assert0(LIBAVFORMAT_VERSION_MICRO >= 100);
64 return LIBAVFORMAT_VERSION_INT;
67 const char *avformat_configuration(void)
69 return FFMPEG_CONFIGURATION;
72 const char *avformat_license(void)
74 #define LICENSE_PREFIX "libavformat license: "
75 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
78 #define RELATIVE_TS_BASE (INT64_MAX - (1LL<<48))
80 static int is_relative(int64_t ts) {
81 return ts > (RELATIVE_TS_BASE - (1LL<<48));
85 * Wrap a given time stamp, if there is an indication for an overflow
88 * @param timestamp the time stamp to wrap
89 * @return resulting time stamp
91 static int64_t wrap_timestamp(AVStream *st, int64_t timestamp)
93 if (st->pts_wrap_behavior != AV_PTS_WRAP_IGNORE &&
94 st->pts_wrap_reference != AV_NOPTS_VALUE && timestamp != AV_NOPTS_VALUE) {
95 if (st->pts_wrap_behavior == AV_PTS_WRAP_ADD_OFFSET &&
96 timestamp < st->pts_wrap_reference)
97 return timestamp + (1ULL << st->pts_wrap_bits);
98 else if (st->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET &&
99 timestamp >= st->pts_wrap_reference)
100 return timestamp - (1ULL << st->pts_wrap_bits);
105 MAKE_ACCESSORS(AVStream, stream, AVRational, r_frame_rate)
106 MAKE_ACCESSORS(AVStream, stream, char *, recommended_encoder_configuration)
107 MAKE_ACCESSORS(AVFormatContext, format, AVCodec *, video_codec)
108 MAKE_ACCESSORS(AVFormatContext, format, AVCodec *, audio_codec)
109 MAKE_ACCESSORS(AVFormatContext, format, AVCodec *, subtitle_codec)
110 MAKE_ACCESSORS(AVFormatContext, format, int, metadata_header_padding)
111 MAKE_ACCESSORS(AVFormatContext, format, void *, opaque)
112 MAKE_ACCESSORS(AVFormatContext, format, av_format_control_message, control_message_cb)
114 int64_t av_stream_get_end_pts(const AVStream *st)
119 struct AVCodecParserContext *av_stream_get_parser(const AVStream *st)
124 void av_format_inject_global_side_data(AVFormatContext *s)
127 s->internal->inject_global_side_data = 1;
128 for (i = 0; i < s->nb_streams; i++) {
129 AVStream *st = s->streams[i];
130 st->inject_global_side_data = 1;
134 int ff_copy_whitelists(AVFormatContext *dst, AVFormatContext *src)
136 av_assert0(!dst->codec_whitelist && !dst->format_whitelist);
137 dst-> codec_whitelist = av_strdup(src->codec_whitelist);
138 dst->format_whitelist = av_strdup(src->format_whitelist);
139 if ( (src-> codec_whitelist && !dst-> codec_whitelist)
140 || (src->format_whitelist && !dst->format_whitelist)) {
141 av_log(dst, AV_LOG_ERROR, "Failed to duplicate whitelist\n");
142 return AVERROR(ENOMEM);
147 static const AVCodec *find_decoder(AVFormatContext *s, AVStream *st, enum AVCodecID codec_id)
149 if (st->codec->codec)
150 return st->codec->codec;
152 switch (st->codec->codec_type) {
153 case AVMEDIA_TYPE_VIDEO:
154 if (s->video_codec) return s->video_codec;
156 case AVMEDIA_TYPE_AUDIO:
157 if (s->audio_codec) return s->audio_codec;
159 case AVMEDIA_TYPE_SUBTITLE:
160 if (s->subtitle_codec) return s->subtitle_codec;
164 return avcodec_find_decoder(codec_id);
167 int av_format_get_probe_score(const AVFormatContext *s)
169 return s->probe_score;
172 /* an arbitrarily chosen "sane" max packet size -- 50M */
173 #define SANE_CHUNK_SIZE (50000000)
175 int ffio_limit(AVIOContext *s, int size)
177 if (s->maxsize>= 0) {
178 int64_t remaining= s->maxsize - avio_tell(s);
179 if (remaining < size) {
180 int64_t newsize = avio_size(s);
181 if (!s->maxsize || s->maxsize<newsize)
182 s->maxsize = newsize - !newsize;
183 remaining= s->maxsize - avio_tell(s);
184 remaining= FFMAX(remaining, 0);
187 if (s->maxsize>= 0 && remaining+1 < size) {
188 av_log(NULL, remaining ? AV_LOG_ERROR : AV_LOG_DEBUG, "Truncating packet of size %d to %"PRId64"\n", size, remaining+1);
195 /* Read the data in sane-sized chunks and append to pkt.
196 * Return the number of bytes read or an error. */
197 static int append_packet_chunked(AVIOContext *s, AVPacket *pkt, int size)
199 int64_t orig_pos = pkt->pos; // av_grow_packet might reset pos
200 int orig_size = pkt->size;
204 int prev_size = pkt->size;
207 /* When the caller requests a lot of data, limit it to the amount
208 * left in file or SANE_CHUNK_SIZE when it is not known. */
210 if (read_size > SANE_CHUNK_SIZE/10) {
211 read_size = ffio_limit(s, read_size);
212 // If filesize/maxsize is unknown, limit to SANE_CHUNK_SIZE
214 read_size = FFMIN(read_size, SANE_CHUNK_SIZE);
217 ret = av_grow_packet(pkt, read_size);
221 ret = avio_read(s, pkt->data + prev_size, read_size);
222 if (ret != read_size) {
223 av_shrink_packet(pkt, prev_size + FFMAX(ret, 0));
230 pkt->flags |= AV_PKT_FLAG_CORRUPT;
235 return pkt->size > orig_size ? pkt->size - orig_size : ret;
238 int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
243 pkt->pos = avio_tell(s);
245 return append_packet_chunked(s, pkt, size);
248 int av_append_packet(AVIOContext *s, AVPacket *pkt, int size)
251 return av_get_packet(s, pkt, size);
252 return append_packet_chunked(s, pkt, size);
255 int av_filename_number_test(const char *filename)
259 (av_get_frame_filename(buf, sizeof(buf), filename, 1) >= 0);
262 static int set_codec_from_probe_data(AVFormatContext *s, AVStream *st,
265 static const struct {
268 enum AVMediaType type;
270 { "aac", AV_CODEC_ID_AAC, AVMEDIA_TYPE_AUDIO },
271 { "ac3", AV_CODEC_ID_AC3, AVMEDIA_TYPE_AUDIO },
272 { "dts", AV_CODEC_ID_DTS, AVMEDIA_TYPE_AUDIO },
273 { "eac3", AV_CODEC_ID_EAC3, AVMEDIA_TYPE_AUDIO },
274 { "h264", AV_CODEC_ID_H264, AVMEDIA_TYPE_VIDEO },
275 { "hevc", AV_CODEC_ID_HEVC, AVMEDIA_TYPE_VIDEO },
276 { "loas", AV_CODEC_ID_AAC_LATM, AVMEDIA_TYPE_AUDIO },
277 { "m4v", AV_CODEC_ID_MPEG4, AVMEDIA_TYPE_VIDEO },
278 { "mp3", AV_CODEC_ID_MP3, AVMEDIA_TYPE_AUDIO },
279 { "mpegvideo", AV_CODEC_ID_MPEG2VIDEO, AVMEDIA_TYPE_VIDEO },
283 AVInputFormat *fmt = av_probe_input_format3(pd, 1, &score);
285 if (fmt && st->request_probe <= score) {
287 av_log(s, AV_LOG_DEBUG,
288 "Probe with size=%d, packets=%d detected %s with score=%d\n",
289 pd->buf_size, MAX_PROBE_PACKETS - st->probe_packets,
291 for (i = 0; fmt_id_type[i].name; i++) {
292 if (!strcmp(fmt->name, fmt_id_type[i].name)) {
293 st->codec->codec_id = fmt_id_type[i].id;
294 st->codec->codec_type = fmt_id_type[i].type;
302 /************************************************************/
303 /* input media file */
305 int av_demuxer_open(AVFormatContext *ic) {
308 if (ic->format_whitelist && av_match_list(ic->iformat->name, ic->format_whitelist, ',') <= 0) {
309 av_log(ic, AV_LOG_ERROR, "Format not on whitelist\n");
310 return AVERROR(EINVAL);
313 if (ic->iformat->read_header) {
314 err = ic->iformat->read_header(ic);
319 if (ic->pb && !ic->data_offset)
320 ic->data_offset = avio_tell(ic->pb);
325 /* Open input file and probe the format if necessary. */
326 static int init_input(AVFormatContext *s, const char *filename,
327 AVDictionary **options)
330 AVProbeData pd = { filename, NULL, 0 };
331 int score = AVPROBE_SCORE_RETRY;
334 s->flags |= AVFMT_FLAG_CUSTOM_IO;
336 return av_probe_input_buffer2(s->pb, &s->iformat, filename,
337 s, 0, s->format_probesize);
338 else if (s->iformat->flags & AVFMT_NOFILE)
339 av_log(s, AV_LOG_WARNING, "Custom AVIOContext makes no sense and "
340 "will be ignored with AVFMT_NOFILE format.\n");
344 if ((s->iformat && s->iformat->flags & AVFMT_NOFILE) ||
345 (!s->iformat && (s->iformat = av_probe_input_format2(&pd, 0, &score))))
348 if ((ret = avio_open2(&s->pb, filename, AVIO_FLAG_READ | s->avio_flags,
349 &s->interrupt_callback, options)) < 0)
353 return av_probe_input_buffer2(s->pb, &s->iformat, filename,
354 s, 0, s->format_probesize);
357 static AVPacket *add_to_pktbuf(AVPacketList **packet_buffer, AVPacket *pkt,
358 AVPacketList **plast_pktl)
360 AVPacketList *pktl = av_mallocz(sizeof(AVPacketList));
365 (*plast_pktl)->next = pktl;
367 *packet_buffer = pktl;
369 /* Add the packet in the buffered packet list. */
375 int avformat_queue_attached_pictures(AVFormatContext *s)
378 for (i = 0; i < s->nb_streams; i++)
379 if (s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC &&
380 s->streams[i]->discard < AVDISCARD_ALL) {
381 AVPacket copy = s->streams[i]->attached_pic;
382 if (copy.size <= 0) {
383 av_log(s, AV_LOG_WARNING,
384 "Attached picture on stream %d has invalid size, "
388 copy.buf = av_buffer_ref(copy.buf);
390 return AVERROR(ENOMEM);
392 add_to_pktbuf(&s->raw_packet_buffer, ©,
393 &s->raw_packet_buffer_end);
398 int avformat_open_input(AVFormatContext **ps, const char *filename,
399 AVInputFormat *fmt, AVDictionary **options)
401 AVFormatContext *s = *ps;
403 AVDictionary *tmp = NULL;
404 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
406 if (!s && !(s = avformat_alloc_context()))
407 return AVERROR(ENOMEM);
409 av_log(NULL, AV_LOG_ERROR, "Input context has not been properly allocated by avformat_alloc_context() and is not NULL either\n");
410 return AVERROR(EINVAL);
416 av_dict_copy(&tmp, *options, 0);
418 if ((ret = av_opt_set_dict(s, &tmp)) < 0)
421 if ((ret = init_input(s, filename, &tmp)) < 0)
423 s->probe_score = ret;
425 if (s->format_whitelist && av_match_list(s->iformat->name, s->format_whitelist, ',') <= 0) {
426 av_log(s, AV_LOG_ERROR, "Format not on whitelist\n");
427 ret = AVERROR(EINVAL);
431 avio_skip(s->pb, s->skip_initial_bytes);
433 /* Check filename in case an image number is expected. */
434 if (s->iformat->flags & AVFMT_NEEDNUMBER) {
435 if (!av_filename_number_test(filename)) {
436 ret = AVERROR(EINVAL);
441 s->duration = s->start_time = AV_NOPTS_VALUE;
442 av_strlcpy(s->filename, filename ? filename : "", sizeof(s->filename));
444 /* Allocate private data. */
445 if (s->iformat->priv_data_size > 0) {
446 if (!(s->priv_data = av_mallocz(s->iformat->priv_data_size))) {
447 ret = AVERROR(ENOMEM);
450 if (s->iformat->priv_class) {
451 *(const AVClass **) s->priv_data = s->iformat->priv_class;
452 av_opt_set_defaults(s->priv_data);
453 if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
458 /* e.g. AVFMT_NOFILE formats will not have a AVIOContext */
460 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
462 if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->iformat->read_header)
463 if ((ret = s->iformat->read_header(s)) < 0)
466 if (id3v2_extra_meta) {
467 if (!strcmp(s->iformat->name, "mp3") || !strcmp(s->iformat->name, "aac") ||
468 !strcmp(s->iformat->name, "tta")) {
469 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0)
472 av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
474 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
476 if ((ret = avformat_queue_attached_pictures(s)) < 0)
479 if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->pb && !s->data_offset)
480 s->data_offset = avio_tell(s->pb);
482 s->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
485 av_dict_free(options);
492 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
494 if (s->pb && !(s->flags & AVFMT_FLAG_CUSTOM_IO))
496 avformat_free_context(s);
501 /*******************************************************/
503 static void force_codec_ids(AVFormatContext *s, AVStream *st)
505 switch (st->codec->codec_type) {
506 case AVMEDIA_TYPE_VIDEO:
507 if (s->video_codec_id)
508 st->codec->codec_id = s->video_codec_id;
510 case AVMEDIA_TYPE_AUDIO:
511 if (s->audio_codec_id)
512 st->codec->codec_id = s->audio_codec_id;
514 case AVMEDIA_TYPE_SUBTITLE:
515 if (s->subtitle_codec_id)
516 st->codec->codec_id = s->subtitle_codec_id;
521 static int probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
523 if (st->request_probe>0) {
524 AVProbeData *pd = &st->probe_data;
526 av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
530 uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
532 av_log(s, AV_LOG_WARNING,
533 "Failed to reallocate probe buffer for stream %d\n",
538 memcpy(pd->buf + pd->buf_size, pkt->data, pkt->size);
539 pd->buf_size += pkt->size;
540 memset(pd->buf + pd->buf_size, 0, AVPROBE_PADDING_SIZE);
543 st->probe_packets = 0;
545 av_log(s, AV_LOG_WARNING,
546 "nothing to probe for stream %d\n", st->index);
550 end= s->raw_packet_buffer_remaining_size <= 0
551 || st->probe_packets<= 0;
553 if (end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)) {
554 int score = set_codec_from_probe_data(s, st, pd);
555 if ( (st->codec->codec_id != AV_CODEC_ID_NONE && score > AVPROBE_SCORE_STREAM_RETRY)
559 st->request_probe = -1;
560 if (st->codec->codec_id != AV_CODEC_ID_NONE) {
561 av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
563 av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
565 force_codec_ids(s, st);
571 static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
573 int64_t ref = pkt->dts;
574 int i, pts_wrap_behavior;
575 int64_t pts_wrap_reference;
576 AVProgram *first_program;
578 if (ref == AV_NOPTS_VALUE)
580 if (st->pts_wrap_reference != AV_NOPTS_VALUE || st->pts_wrap_bits >= 63 || ref == AV_NOPTS_VALUE || !s->correct_ts_overflow)
582 ref &= (1LL << st->pts_wrap_bits)-1;
584 // reference time stamp should be 60 s before first time stamp
585 pts_wrap_reference = ref - av_rescale(60, st->time_base.den, st->time_base.num);
586 // if first time stamp is not more than 1/8 and 60s before the wrap point, subtract rather than add wrap offset
587 pts_wrap_behavior = (ref < (1LL << st->pts_wrap_bits) - (1LL << st->pts_wrap_bits-3)) ||
588 (ref < (1LL << st->pts_wrap_bits) - av_rescale(60, st->time_base.den, st->time_base.num)) ?
589 AV_PTS_WRAP_ADD_OFFSET : AV_PTS_WRAP_SUB_OFFSET;
591 first_program = av_find_program_from_stream(s, NULL, stream_index);
593 if (!first_program) {
594 int default_stream_index = av_find_default_stream_index(s);
595 if (s->streams[default_stream_index]->pts_wrap_reference == AV_NOPTS_VALUE) {
596 for (i = 0; i < s->nb_streams; i++) {
597 s->streams[i]->pts_wrap_reference = pts_wrap_reference;
598 s->streams[i]->pts_wrap_behavior = pts_wrap_behavior;
602 st->pts_wrap_reference = s->streams[default_stream_index]->pts_wrap_reference;
603 st->pts_wrap_behavior = s->streams[default_stream_index]->pts_wrap_behavior;
607 AVProgram *program = first_program;
609 if (program->pts_wrap_reference != AV_NOPTS_VALUE) {
610 pts_wrap_reference = program->pts_wrap_reference;
611 pts_wrap_behavior = program->pts_wrap_behavior;
614 program = av_find_program_from_stream(s, program, stream_index);
617 // update every program with differing pts_wrap_reference
618 program = first_program;
620 if (program->pts_wrap_reference != pts_wrap_reference) {
621 for (i = 0; i<program->nb_stream_indexes; i++) {
622 s->streams[program->stream_index[i]]->pts_wrap_reference = pts_wrap_reference;
623 s->streams[program->stream_index[i]]->pts_wrap_behavior = pts_wrap_behavior;
626 program->pts_wrap_reference = pts_wrap_reference;
627 program->pts_wrap_behavior = pts_wrap_behavior;
629 program = av_find_program_from_stream(s, program, stream_index);
635 int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
641 AVPacketList *pktl = s->raw_packet_buffer;
645 st = s->streams[pkt->stream_index];
646 if (s->raw_packet_buffer_remaining_size <= 0)
647 if ((err = probe_codec(s, st, NULL)) < 0)
649 if (st->request_probe <= 0) {
650 s->raw_packet_buffer = pktl->next;
651 s->raw_packet_buffer_remaining_size += pkt->size;
660 ret = s->iformat->read_packet(s, pkt);
662 if (!pktl || ret == AVERROR(EAGAIN))
664 for (i = 0; i < s->nb_streams; i++) {
666 if (st->probe_packets)
667 if ((err = probe_codec(s, st, NULL)) < 0)
669 av_assert0(st->request_probe <= 0);
674 if ((s->flags & AVFMT_FLAG_DISCARD_CORRUPT) &&
675 (pkt->flags & AV_PKT_FLAG_CORRUPT)) {
676 av_log(s, AV_LOG_WARNING,
677 "Dropped corrupted packet (stream = %d)\n",
683 if (pkt->stream_index >= (unsigned)s->nb_streams) {
684 av_log(s, AV_LOG_ERROR, "Invalid stream index %d\n", pkt->stream_index);
688 st = s->streams[pkt->stream_index];
690 if (update_wrap_reference(s, st, pkt->stream_index, pkt) && st->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET) {
691 // correct first time stamps to negative values
692 if (!is_relative(st->first_dts))
693 st->first_dts = wrap_timestamp(st, st->first_dts);
694 if (!is_relative(st->start_time))
695 st->start_time = wrap_timestamp(st, st->start_time);
696 if (!is_relative(st->cur_dts))
697 st->cur_dts = wrap_timestamp(st, st->cur_dts);
700 pkt->dts = wrap_timestamp(st, pkt->dts);
701 pkt->pts = wrap_timestamp(st, pkt->pts);
703 force_codec_ids(s, st);
705 /* TODO: audio: time filter; video: frame reordering (pts != dts) */
706 if (s->use_wallclock_as_timestamps)
707 pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
709 if (!pktl && st->request_probe <= 0)
712 add_to_pktbuf(&s->raw_packet_buffer, pkt, &s->raw_packet_buffer_end);
713 s->raw_packet_buffer_remaining_size -= pkt->size;
715 if ((err = probe_codec(s, st, pkt)) < 0)
721 /**********************************************************/
723 static int determinable_frame_size(AVCodecContext *avctx)
725 if (/*avctx->codec_id == AV_CODEC_ID_AAC ||*/
726 avctx->codec_id == AV_CODEC_ID_MP1 ||
727 avctx->codec_id == AV_CODEC_ID_MP2 ||
728 avctx->codec_id == AV_CODEC_ID_MP3/* ||
729 avctx->codec_id == AV_CODEC_ID_CELT*/)
735 * Return the frame duration in seconds. Return 0 if not available.
737 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
738 AVCodecParserContext *pc, AVPacket *pkt)
740 AVRational codec_framerate = s->iformat ? st->codec->framerate :
741 av_mul_q(av_inv_q(st->codec->time_base), (AVRational){1, st->codec->ticks_per_frame});
746 switch (st->codec->codec_type) {
747 case AVMEDIA_TYPE_VIDEO:
748 if (st->r_frame_rate.num && !pc) {
749 *pnum = st->r_frame_rate.den;
750 *pden = st->r_frame_rate.num;
751 } else if (st->time_base.num * 1000LL > st->time_base.den) {
752 *pnum = st->time_base.num;
753 *pden = st->time_base.den;
754 } else if (codec_framerate.den * 1000LL > codec_framerate.num) {
755 av_assert0(st->codec->ticks_per_frame);
756 av_reduce(pnum, pden,
758 codec_framerate.num * (int64_t)st->codec->ticks_per_frame,
761 if (pc && pc->repeat_pict) {
762 av_assert0(s->iformat); // this may be wrong for interlaced encoding but its not used for that case
763 av_reduce(pnum, pden,
764 (*pnum) * (1LL + pc->repeat_pict),
768 /* If this codec can be interlaced or progressive then we need
769 * a parser to compute duration of a packet. Thus if we have
770 * no parser in such case leave duration undefined. */
771 if (st->codec->ticks_per_frame > 1 && !pc)
775 case AVMEDIA_TYPE_AUDIO:
776 frame_size = av_get_audio_frame_duration(st->codec, pkt->size);
777 if (frame_size <= 0 || st->codec->sample_rate <= 0)
780 *pden = st->codec->sample_rate;
787 static int is_intra_only(AVCodecContext *enc) {
788 const AVCodecDescriptor *desc;
790 if (enc->codec_type != AVMEDIA_TYPE_VIDEO)
793 desc = av_codec_get_codec_descriptor(enc);
795 desc = avcodec_descriptor_get(enc->codec_id);
796 av_codec_set_codec_descriptor(enc, desc);
799 return !!(desc->props & AV_CODEC_PROP_INTRA_ONLY);
803 static int has_decode_delay_been_guessed(AVStream *st)
805 if (st->codec->codec_id != AV_CODEC_ID_H264) return 1;
806 if (!st->info) // if we have left find_stream_info then nb_decoded_frames won't increase anymore for stream copy
808 #if CONFIG_H264_DECODER
809 if (st->codec->has_b_frames &&
810 avpriv_h264_has_num_reorder_frames(st->codec) == st->codec->has_b_frames)
813 if (st->codec->has_b_frames<3)
814 return st->nb_decoded_frames >= 7;
815 else if (st->codec->has_b_frames<4)
816 return st->nb_decoded_frames >= 18;
818 return st->nb_decoded_frames >= 20;
821 static AVPacketList *get_next_pkt(AVFormatContext *s, AVStream *st, AVPacketList *pktl)
825 if (pktl == s->packet_buffer_end)
826 return s->parse_queue;
830 static int64_t select_from_pts_buffer(AVStream *st, int64_t *pts_buffer, int64_t dts) {
831 int onein_oneout = st->codec->codec_id != AV_CODEC_ID_H264 &&
832 st->codec->codec_id != AV_CODEC_ID_HEVC;
835 int delay = st->codec->has_b_frames;
838 if (dts == AV_NOPTS_VALUE) {
839 int64_t best_score = INT64_MAX;
840 for (i = 0; i<delay; i++) {
841 if (st->pts_reorder_error_count[i]) {
842 int64_t score = st->pts_reorder_error[i] / st->pts_reorder_error_count[i];
843 if (score < best_score) {
850 for (i = 0; i<delay; i++) {
851 if (pts_buffer[i] != AV_NOPTS_VALUE) {
852 int64_t diff = FFABS(pts_buffer[i] - dts)
853 + (uint64_t)st->pts_reorder_error[i];
854 diff = FFMAX(diff, st->pts_reorder_error[i]);
855 st->pts_reorder_error[i] = diff;
856 st->pts_reorder_error_count[i]++;
857 if (st->pts_reorder_error_count[i] > 250) {
858 st->pts_reorder_error[i] >>= 1;
859 st->pts_reorder_error_count[i] >>= 1;
866 if (dts == AV_NOPTS_VALUE)
872 static void update_initial_timestamps(AVFormatContext *s, int stream_index,
873 int64_t dts, int64_t pts, AVPacket *pkt)
875 AVStream *st = s->streams[stream_index];
876 AVPacketList *pktl = s->packet_buffer ? s->packet_buffer : s->parse_queue;
877 int64_t pts_buffer[MAX_REORDER_DELAY+1];
881 if (st->first_dts != AV_NOPTS_VALUE ||
882 dts == AV_NOPTS_VALUE ||
883 st->cur_dts == AV_NOPTS_VALUE ||
887 delay = st->codec->has_b_frames;
888 st->first_dts = dts - (st->cur_dts - RELATIVE_TS_BASE);
890 shift = st->first_dts - RELATIVE_TS_BASE;
892 for (i = 0; i<MAX_REORDER_DELAY+1; i++)
893 pts_buffer[i] = AV_NOPTS_VALUE;
895 if (is_relative(pts))
898 for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
899 if (pktl->pkt.stream_index != stream_index)
901 if (is_relative(pktl->pkt.pts))
902 pktl->pkt.pts += shift;
904 if (is_relative(pktl->pkt.dts))
905 pktl->pkt.dts += shift;
907 if (st->start_time == AV_NOPTS_VALUE && pktl->pkt.pts != AV_NOPTS_VALUE)
908 st->start_time = pktl->pkt.pts;
910 if (pktl->pkt.pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY && has_decode_delay_been_guessed(st)) {
911 pts_buffer[0] = pktl->pkt.pts;
912 for (i = 0; i<delay && pts_buffer[i] > pts_buffer[i + 1]; i++)
913 FFSWAP(int64_t, pts_buffer[i], pts_buffer[i + 1]);
915 pktl->pkt.dts = select_from_pts_buffer(st, pts_buffer, pktl->pkt.dts);
919 if (st->start_time == AV_NOPTS_VALUE)
920 st->start_time = pts;
923 static void update_initial_durations(AVFormatContext *s, AVStream *st,
924 int stream_index, int duration)
926 AVPacketList *pktl = s->packet_buffer ? s->packet_buffer : s->parse_queue;
927 int64_t cur_dts = RELATIVE_TS_BASE;
929 if (st->first_dts != AV_NOPTS_VALUE) {
930 if (st->update_initial_durations_done)
932 st->update_initial_durations_done = 1;
933 cur_dts = st->first_dts;
934 for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
935 if (pktl->pkt.stream_index == stream_index) {
936 if (pktl->pkt.pts != pktl->pkt.dts ||
937 pktl->pkt.dts != AV_NOPTS_VALUE ||
943 if (pktl && pktl->pkt.dts != st->first_dts) {
944 av_log(s, AV_LOG_DEBUG, "first_dts %s not matching first dts %s (pts %s, duration %d) in the queue\n",
945 av_ts2str(st->first_dts), av_ts2str(pktl->pkt.dts), av_ts2str(pktl->pkt.pts), pktl->pkt.duration);
949 av_log(s, AV_LOG_DEBUG, "first_dts %s but no packet with dts in the queue\n", av_ts2str(st->first_dts));
952 pktl = s->packet_buffer ? s->packet_buffer : s->parse_queue;
953 st->first_dts = cur_dts;
954 } else if (st->cur_dts != RELATIVE_TS_BASE)
957 for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
958 if (pktl->pkt.stream_index != stream_index)
960 if (pktl->pkt.pts == pktl->pkt.dts &&
961 (pktl->pkt.dts == AV_NOPTS_VALUE || pktl->pkt.dts == st->first_dts) &&
962 !pktl->pkt.duration) {
963 pktl->pkt.dts = cur_dts;
964 if (!st->codec->has_b_frames)
965 pktl->pkt.pts = cur_dts;
966 // if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO)
967 pktl->pkt.duration = duration;
970 cur_dts = pktl->pkt.dts + pktl->pkt.duration;
973 st->cur_dts = cur_dts;
976 static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
977 AVCodecParserContext *pc, AVPacket *pkt,
978 int64_t next_dts, int64_t next_pts)
980 int num, den, presentation_delayed, delay, i;
983 int onein_oneout = st->codec->codec_id != AV_CODEC_ID_H264 &&
984 st->codec->codec_id != AV_CODEC_ID_HEVC;
986 if (s->flags & AVFMT_FLAG_NOFILLIN)
989 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && pkt->dts != AV_NOPTS_VALUE) {
990 if (pkt->dts == pkt->pts && st->last_dts_for_order_check != AV_NOPTS_VALUE) {
991 if (st->last_dts_for_order_check <= pkt->dts) {
994 av_log(s, st->dts_misordered ? AV_LOG_DEBUG : AV_LOG_WARNING,
995 "DTS %"PRIi64" < %"PRIi64" out of order\n",
997 st->last_dts_for_order_check);
998 st->dts_misordered++;
1000 if (st->dts_ordered + st->dts_misordered > 250) {
1001 st->dts_ordered >>= 1;
1002 st->dts_misordered >>= 1;
1006 st->last_dts_for_order_check = pkt->dts;
1007 if (st->dts_ordered < 8*st->dts_misordered && pkt->dts == pkt->pts)
1008 pkt->dts = AV_NOPTS_VALUE;
1011 if ((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
1012 pkt->dts = AV_NOPTS_VALUE;
1014 if (pc && pc->pict_type == AV_PICTURE_TYPE_B
1015 && !st->codec->has_b_frames)
1016 //FIXME Set low_delay = 0 when has_b_frames = 1
1017 st->codec->has_b_frames = 1;
1019 /* do we have a video B-frame ? */
1020 delay = st->codec->has_b_frames;
1021 presentation_delayed = 0;
1023 /* XXX: need has_b_frame, but cannot get it if the codec is
1024 * not initialized */
1026 pc && pc->pict_type != AV_PICTURE_TYPE_B)
1027 presentation_delayed = 1;
1029 if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
1030 st->pts_wrap_bits < 63 &&
1031 pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
1032 if (is_relative(st->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > st->cur_dts) {
1033 pkt->dts -= 1LL << st->pts_wrap_bits;
1035 pkt->pts += 1LL << st->pts_wrap_bits;
1038 /* Some MPEG-2 in MPEG-PS lack dts (issue #171 / input_file.mpg).
1039 * We take the conservative approach and discard both.
1040 * Note: If this is misbehaving for an H.264 file, then possibly
1041 * presentation_delayed is not set correctly. */
1042 if (delay == 1 && pkt->dts == pkt->pts &&
1043 pkt->dts != AV_NOPTS_VALUE && presentation_delayed) {
1044 av_log(s, AV_LOG_DEBUG, "invalid dts/pts combination %"PRIi64"\n", pkt->dts);
1045 if ( strcmp(s->iformat->name, "mov,mp4,m4a,3gp,3g2,mj2")
1046 && strcmp(s->iformat->name, "flv")) // otherwise we discard correct timestamps for vc1-wmapro.ism
1047 pkt->dts = AV_NOPTS_VALUE;
1050 duration = av_mul_q((AVRational) {pkt->duration, 1}, st->time_base);
1051 if (pkt->duration == 0) {
1052 ff_compute_frame_duration(s, &num, &den, st, pc, pkt);
1054 duration = (AVRational) {num, den};
1055 pkt->duration = av_rescale_rnd(1,
1056 num * (int64_t) st->time_base.den,
1057 den * (int64_t) st->time_base.num,
1062 if (pkt->duration != 0 && (s->packet_buffer || s->parse_queue))
1063 update_initial_durations(s, st, pkt->stream_index, pkt->duration);
1065 /* Correct timestamps with byte offset if demuxers only have timestamps
1066 * on packet boundaries */
1067 if (pc && st->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size) {
1068 /* this will estimate bitrate based on this frame's duration and size */
1069 offset = av_rescale(pc->offset, pkt->duration, pkt->size);
1070 if (pkt->pts != AV_NOPTS_VALUE)
1072 if (pkt->dts != AV_NOPTS_VALUE)
1076 /* This may be redundant, but it should not hurt. */
1077 if (pkt->dts != AV_NOPTS_VALUE &&
1078 pkt->pts != AV_NOPTS_VALUE &&
1079 pkt->pts > pkt->dts)
1080 presentation_delayed = 1;
1083 "IN delayed:%d pts:%s, dts:%s cur_dts:%s st:%d pc:%p duration:%d delay:%d onein_oneout:%d\n",
1084 presentation_delayed, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts),
1085 pkt->stream_index, pc, pkt->duration, delay, onein_oneout);
1086 /* Interpolate PTS and DTS if they are not present. We skip H264
1087 * currently because delay and has_b_frames are not reliably set. */
1088 if ((delay == 0 || (delay == 1 && pc)) &&
1090 if (presentation_delayed) {
1091 /* DTS = decompression timestamp */
1092 /* PTS = presentation timestamp */
1093 if (pkt->dts == AV_NOPTS_VALUE)
1094 pkt->dts = st->last_IP_pts;
1095 update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1096 if (pkt->dts == AV_NOPTS_VALUE)
1097 pkt->dts = st->cur_dts;
1099 /* This is tricky: the dts must be incremented by the duration
1100 * of the frame we are displaying, i.e. the last I- or P-frame. */
1101 if (st->last_IP_duration == 0)
1102 st->last_IP_duration = pkt->duration;
1103 if (pkt->dts != AV_NOPTS_VALUE)
1104 st->cur_dts = pkt->dts + st->last_IP_duration;
1105 if (pkt->dts != AV_NOPTS_VALUE &&
1106 pkt->pts == AV_NOPTS_VALUE &&
1107 st->last_IP_duration > 0 &&
1108 ((uint64_t)st->cur_dts - (uint64_t)next_dts + 1) <= 2 &&
1109 next_dts != next_pts &&
1110 next_pts != AV_NOPTS_VALUE)
1111 pkt->pts = next_dts;
1113 st->last_IP_duration = pkt->duration;
1114 st->last_IP_pts = pkt->pts;
1115 /* Cannot compute PTS if not present (we can compute it only
1116 * by knowing the future. */
1117 } else if (pkt->pts != AV_NOPTS_VALUE ||
1118 pkt->dts != AV_NOPTS_VALUE ||
1121 /* presentation is not delayed : PTS and DTS are the same */
1122 if (pkt->pts == AV_NOPTS_VALUE)
1123 pkt->pts = pkt->dts;
1124 update_initial_timestamps(s, pkt->stream_index, pkt->pts,
1126 if (pkt->pts == AV_NOPTS_VALUE)
1127 pkt->pts = st->cur_dts;
1128 pkt->dts = pkt->pts;
1129 if (pkt->pts != AV_NOPTS_VALUE)
1130 st->cur_dts = av_add_stable(st->time_base, pkt->pts, duration, 1);
1134 if (pkt->pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY && has_decode_delay_been_guessed(st)) {
1135 st->pts_buffer[0] = pkt->pts;
1136 for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
1137 FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
1139 pkt->dts = select_from_pts_buffer(st, st->pts_buffer, pkt->dts);
1141 // We skipped it above so we try here.
1143 // This should happen on the first packet
1144 update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1145 if (pkt->dts > st->cur_dts)
1146 st->cur_dts = pkt->dts;
1148 av_dlog(NULL, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s\n",
1149 presentation_delayed, delay, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts));
1152 if (is_intra_only(st->codec))
1153 pkt->flags |= AV_PKT_FLAG_KEY;
1155 pkt->convergence_duration = pc->convergence_duration;
1158 static void free_packet_buffer(AVPacketList **pkt_buf, AVPacketList **pkt_buf_end)
1161 AVPacketList *pktl = *pkt_buf;
1162 *pkt_buf = pktl->next;
1163 av_free_packet(&pktl->pkt);
1166 *pkt_buf_end = NULL;
1170 * Parse a packet, add all split parts to parse_queue.
1172 * @param pkt Packet to parse, NULL when flushing the parser at end of stream.
1174 static int parse_packet(AVFormatContext *s, AVPacket *pkt, int stream_index)
1176 AVPacket out_pkt = { 0 }, flush_pkt = { 0 };
1177 AVStream *st = s->streams[stream_index];
1178 uint8_t *data = pkt ? pkt->data : NULL;
1179 int size = pkt ? pkt->size : 0;
1180 int ret = 0, got_output = 0;
1183 av_init_packet(&flush_pkt);
1186 } else if (!size && st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
1187 // preserve 0-size sync packets
1188 compute_pkt_fields(s, st, st->parser, pkt, AV_NOPTS_VALUE, AV_NOPTS_VALUE);
1191 while (size > 0 || (pkt == &flush_pkt && got_output)) {
1193 int64_t next_pts = pkt->pts;
1194 int64_t next_dts = pkt->dts;
1196 av_init_packet(&out_pkt);
1197 len = av_parser_parse2(st->parser, st->codec,
1198 &out_pkt.data, &out_pkt.size, data, size,
1199 pkt->pts, pkt->dts, pkt->pos);
1201 pkt->pts = pkt->dts = AV_NOPTS_VALUE;
1203 /* increment read pointer */
1207 got_output = !!out_pkt.size;
1212 if (pkt->side_data) {
1213 out_pkt.side_data = pkt->side_data;
1214 out_pkt.side_data_elems = pkt->side_data_elems;
1215 pkt->side_data = NULL;
1216 pkt->side_data_elems = 0;
1219 /* set the duration */
1220 out_pkt.duration = 0;
1221 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1222 if (st->codec->sample_rate > 0) {
1224 av_rescale_q_rnd(st->parser->duration,
1225 (AVRational) { 1, st->codec->sample_rate },
1231 out_pkt.stream_index = st->index;
1232 out_pkt.pts = st->parser->pts;
1233 out_pkt.dts = st->parser->dts;
1234 out_pkt.pos = st->parser->pos;
1236 if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW)
1237 out_pkt.pos = st->parser->frame_offset;
1239 if (st->parser->key_frame == 1 ||
1240 (st->parser->key_frame == -1 &&
1241 st->parser->pict_type == AV_PICTURE_TYPE_I))
1242 out_pkt.flags |= AV_PKT_FLAG_KEY;
1244 if (st->parser->key_frame == -1 && st->parser->pict_type ==AV_PICTURE_TYPE_NONE && (pkt->flags&AV_PKT_FLAG_KEY))
1245 out_pkt.flags |= AV_PKT_FLAG_KEY;
1247 compute_pkt_fields(s, st, st->parser, &out_pkt, next_dts, next_pts);
1249 if (out_pkt.data == pkt->data && out_pkt.size == pkt->size) {
1250 out_pkt.buf = pkt->buf;
1252 #if FF_API_DESTRUCT_PACKET
1253 FF_DISABLE_DEPRECATION_WARNINGS
1254 out_pkt.destruct = pkt->destruct;
1255 pkt->destruct = NULL;
1256 FF_ENABLE_DEPRECATION_WARNINGS
1259 if ((ret = av_dup_packet(&out_pkt)) < 0)
1262 if (!add_to_pktbuf(&s->parse_queue, &out_pkt, &s->parse_queue_end)) {
1263 av_free_packet(&out_pkt);
1264 ret = AVERROR(ENOMEM);
1269 /* end of the stream => close and free the parser */
1270 if (pkt == &flush_pkt) {
1271 av_parser_close(st->parser);
1276 av_free_packet(pkt);
1280 static int read_from_packet_buffer(AVPacketList **pkt_buffer,
1281 AVPacketList **pkt_buffer_end,
1285 av_assert0(*pkt_buffer);
1288 *pkt_buffer = pktl->next;
1290 *pkt_buffer_end = NULL;
1295 static int64_t ts_to_samples(AVStream *st, int64_t ts)
1297 return av_rescale(ts, st->time_base.num * st->codec->sample_rate, st->time_base.den);
1300 static int read_frame_internal(AVFormatContext *s, AVPacket *pkt)
1302 int ret = 0, i, got_packet = 0;
1303 AVDictionary *metadata = NULL;
1305 av_init_packet(pkt);
1307 while (!got_packet && !s->parse_queue) {
1311 /* read next packet */
1312 ret = ff_read_packet(s, &cur_pkt);
1314 if (ret == AVERROR(EAGAIN))
1316 /* flush the parsers */
1317 for (i = 0; i < s->nb_streams; i++) {
1319 if (st->parser && st->need_parsing)
1320 parse_packet(s, NULL, st->index);
1322 /* all remaining packets are now in parse_queue =>
1323 * really terminate parsing */
1327 st = s->streams[cur_pkt.stream_index];
1329 if (cur_pkt.pts != AV_NOPTS_VALUE &&
1330 cur_pkt.dts != AV_NOPTS_VALUE &&
1331 cur_pkt.pts < cur_pkt.dts) {
1332 av_log(s, AV_LOG_WARNING,
1333 "Invalid timestamps stream=%d, pts=%s, dts=%s, size=%d\n",
1334 cur_pkt.stream_index,
1335 av_ts2str(cur_pkt.pts),
1336 av_ts2str(cur_pkt.dts),
1339 if (s->debug & FF_FDEBUG_TS)
1340 av_log(s, AV_LOG_DEBUG,
1341 "ff_read_packet stream=%d, pts=%s, dts=%s, size=%d, duration=%d, flags=%d\n",
1342 cur_pkt.stream_index,
1343 av_ts2str(cur_pkt.pts),
1344 av_ts2str(cur_pkt.dts),
1345 cur_pkt.size, cur_pkt.duration, cur_pkt.flags);
1347 if (st->need_parsing && !st->parser && !(s->flags & AVFMT_FLAG_NOPARSE)) {
1348 st->parser = av_parser_init(st->codec->codec_id);
1350 av_log(s, AV_LOG_VERBOSE, "parser not found for codec "
1351 "%s, packets or times may be invalid.\n",
1352 avcodec_get_name(st->codec->codec_id));
1353 /* no parser available: just output the raw packets */
1354 st->need_parsing = AVSTREAM_PARSE_NONE;
1355 } else if (st->need_parsing == AVSTREAM_PARSE_HEADERS)
1356 st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
1357 else if (st->need_parsing == AVSTREAM_PARSE_FULL_ONCE)
1358 st->parser->flags |= PARSER_FLAG_ONCE;
1359 else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW)
1360 st->parser->flags |= PARSER_FLAG_USE_CODEC_TS;
1363 if (!st->need_parsing || !st->parser) {
1364 /* no parsing needed: we just output the packet as is */
1366 compute_pkt_fields(s, st, NULL, pkt, AV_NOPTS_VALUE, AV_NOPTS_VALUE);
1367 if ((s->iformat->flags & AVFMT_GENERIC_INDEX) &&
1368 (pkt->flags & AV_PKT_FLAG_KEY) && pkt->dts != AV_NOPTS_VALUE) {
1369 ff_reduce_index(s, st->index);
1370 av_add_index_entry(st, pkt->pos, pkt->dts,
1371 0, 0, AVINDEX_KEYFRAME);
1374 } else if (st->discard < AVDISCARD_ALL) {
1375 if ((ret = parse_packet(s, &cur_pkt, cur_pkt.stream_index)) < 0)
1379 av_free_packet(&cur_pkt);
1381 if (pkt->flags & AV_PKT_FLAG_KEY)
1382 st->skip_to_keyframe = 0;
1383 if (st->skip_to_keyframe) {
1384 av_free_packet(&cur_pkt);
1392 if (!got_packet && s->parse_queue)
1393 ret = read_from_packet_buffer(&s->parse_queue, &s->parse_queue_end, pkt);
1396 AVStream *st = s->streams[pkt->stream_index];
1397 int discard_padding = 0;
1398 if (st->first_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
1399 int64_t pts = pkt->pts - (is_relative(pkt->pts) ? RELATIVE_TS_BASE : 0);
1400 int64_t sample = ts_to_samples(st, pts);
1401 int duration = ts_to_samples(st, pkt->duration);
1402 int64_t end_sample = sample + duration;
1403 if (duration > 0 && end_sample >= st->first_discard_sample &&
1404 sample < st->last_discard_sample)
1405 discard_padding = FFMIN(end_sample - st->first_discard_sample, duration);
1407 if (st->skip_samples || discard_padding) {
1408 uint8_t *p = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
1410 AV_WL32(p, st->skip_samples);
1411 AV_WL32(p + 4, discard_padding);
1412 av_log(s, AV_LOG_DEBUG, "demuxer injecting skip %d\n", st->skip_samples);
1414 st->skip_samples = 0;
1417 if (st->inject_global_side_data) {
1418 for (i = 0; i < st->nb_side_data; i++) {
1419 AVPacketSideData *src_sd = &st->side_data[i];
1422 if (av_packet_get_side_data(pkt, src_sd->type, NULL))
1425 dst_data = av_packet_new_side_data(pkt, src_sd->type, src_sd->size);
1427 av_log(s, AV_LOG_WARNING, "Could not inject global side data\n");
1431 memcpy(dst_data, src_sd->data, src_sd->size);
1433 st->inject_global_side_data = 0;
1436 if (!(s->flags & AVFMT_FLAG_KEEP_SIDE_DATA))
1437 av_packet_merge_side_data(pkt);
1440 av_opt_get_dict_val(s, "metadata", AV_OPT_SEARCH_CHILDREN, &metadata);
1442 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
1443 av_dict_copy(&s->metadata, metadata, 0);
1444 av_dict_free(&metadata);
1445 av_opt_set_dict_val(s, "metadata", NULL, AV_OPT_SEARCH_CHILDREN);
1448 if (s->debug & FF_FDEBUG_TS)
1449 av_log(s, AV_LOG_DEBUG,
1450 "read_frame_internal stream=%d, pts=%s, dts=%s, "
1451 "size=%d, duration=%d, flags=%d\n",
1453 av_ts2str(pkt->pts),
1454 av_ts2str(pkt->dts),
1455 pkt->size, pkt->duration, pkt->flags);
1460 int av_read_frame(AVFormatContext *s, AVPacket *pkt)
1462 const int genpts = s->flags & AVFMT_FLAG_GENPTS;
1468 ret = s->packet_buffer
1469 ? read_from_packet_buffer(&s->packet_buffer,
1470 &s->packet_buffer_end, pkt)
1471 : read_frame_internal(s, pkt);
1478 AVPacketList *pktl = s->packet_buffer;
1481 AVPacket *next_pkt = &pktl->pkt;
1483 if (next_pkt->dts != AV_NOPTS_VALUE) {
1484 int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits;
1485 // last dts seen for this stream. if any of packets following
1486 // current one had no dts, we will set this to AV_NOPTS_VALUE.
1487 int64_t last_dts = next_pkt->dts;
1488 while (pktl && next_pkt->pts == AV_NOPTS_VALUE) {
1489 if (pktl->pkt.stream_index == next_pkt->stream_index &&
1490 (av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2LL << (wrap_bits - 1)) < 0)) {
1491 if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2LL << (wrap_bits - 1))) {
1493 next_pkt->pts = pktl->pkt.dts;
1495 if (last_dts != AV_NOPTS_VALUE) {
1496 // Once last dts was set to AV_NOPTS_VALUE, we don't change it.
1497 last_dts = pktl->pkt.dts;
1502 if (eof && next_pkt->pts == AV_NOPTS_VALUE && last_dts != AV_NOPTS_VALUE) {
1503 // Fixing the last reference frame had none pts issue (For MXF etc).
1504 // We only do this when
1506 // 2. we are not able to resolve a pts value for current packet.
1507 // 3. the packets for this stream at the end of the files had valid dts.
1508 next_pkt->pts = last_dts + next_pkt->duration;
1510 pktl = s->packet_buffer;
1513 /* read packet from packet buffer, if there is data */
1514 st = s->streams[next_pkt->stream_index];
1515 if (!(next_pkt->pts == AV_NOPTS_VALUE && st->discard < AVDISCARD_ALL &&
1516 next_pkt->dts != AV_NOPTS_VALUE && !eof)) {
1517 ret = read_from_packet_buffer(&s->packet_buffer,
1518 &s->packet_buffer_end, pkt);
1523 ret = read_frame_internal(s, pkt);
1525 if (pktl && ret != AVERROR(EAGAIN)) {
1532 if (av_dup_packet(add_to_pktbuf(&s->packet_buffer, pkt,
1533 &s->packet_buffer_end)) < 0)
1534 return AVERROR(ENOMEM);
1539 st = s->streams[pkt->stream_index];
1540 if ((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & AV_PKT_FLAG_KEY) {
1541 ff_reduce_index(s, st->index);
1542 av_add_index_entry(st, pkt->pos, pkt->dts, 0, 0, AVINDEX_KEYFRAME);
1545 if (is_relative(pkt->dts))
1546 pkt->dts -= RELATIVE_TS_BASE;
1547 if (is_relative(pkt->pts))
1548 pkt->pts -= RELATIVE_TS_BASE;
1553 /* XXX: suppress the packet queue */
1554 static void flush_packet_queue(AVFormatContext *s)
1556 free_packet_buffer(&s->parse_queue, &s->parse_queue_end);
1557 free_packet_buffer(&s->packet_buffer, &s->packet_buffer_end);
1558 free_packet_buffer(&s->raw_packet_buffer, &s->raw_packet_buffer_end);
1560 s->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
1563 /*******************************************************/
1566 int av_find_default_stream_index(AVFormatContext *s)
1570 int best_stream = 0;
1571 int best_score = -1;
1573 if (s->nb_streams <= 0)
1575 for (i = 0; i < s->nb_streams; i++) {
1578 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
1579 !(st->disposition & AV_DISPOSITION_ATTACHED_PIC)) {
1580 if (!st->codec->width && !st->codec->height && !st->codec_info_nb_frames)
1585 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1586 if (!st->codec->sample_rate && !st->codec_info_nb_frames)
1592 if (score > best_score) {
1600 /** Flush the frame reader. */
1601 void ff_read_frame_flush(AVFormatContext *s)
1606 flush_packet_queue(s);
1608 /* Reset read state for each stream. */
1609 for (i = 0; i < s->nb_streams; i++) {
1613 av_parser_close(st->parser);
1616 st->last_IP_pts = AV_NOPTS_VALUE;
1617 st->last_dts_for_order_check = AV_NOPTS_VALUE;
1618 if (st->first_dts == AV_NOPTS_VALUE)
1619 st->cur_dts = RELATIVE_TS_BASE;
1621 /* We set the current DTS to an unspecified origin. */
1622 st->cur_dts = AV_NOPTS_VALUE;
1624 st->probe_packets = MAX_PROBE_PACKETS;
1626 for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
1627 st->pts_buffer[j] = AV_NOPTS_VALUE;
1629 if (s->internal->inject_global_side_data)
1630 st->inject_global_side_data = 1;
1634 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
1638 for (i = 0; i < s->nb_streams; i++) {
1639 AVStream *st = s->streams[i];
1642 av_rescale(timestamp,
1643 st->time_base.den * (int64_t) ref_st->time_base.num,
1644 st->time_base.num * (int64_t) ref_st->time_base.den);
1648 void ff_reduce_index(AVFormatContext *s, int stream_index)
1650 AVStream *st = s->streams[stream_index];
1651 unsigned int max_entries = s->max_index_size / sizeof(AVIndexEntry);
1653 if ((unsigned) st->nb_index_entries >= max_entries) {
1655 for (i = 0; 2 * i < st->nb_index_entries; i++)
1656 st->index_entries[i] = st->index_entries[2 * i];
1657 st->nb_index_entries = i;
1661 int ff_add_index_entry(AVIndexEntry **index_entries,
1662 int *nb_index_entries,
1663 unsigned int *index_entries_allocated_size,
1664 int64_t pos, int64_t timestamp,
1665 int size, int distance, int flags)
1667 AVIndexEntry *entries, *ie;
1670 if ((unsigned) *nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
1673 if (timestamp == AV_NOPTS_VALUE)
1674 return AVERROR(EINVAL);
1676 if (size < 0 || size > 0x3FFFFFFF)
1677 return AVERROR(EINVAL);
1679 if (is_relative(timestamp)) //FIXME this maintains previous behavior but we should shift by the correct offset once known
1680 timestamp -= RELATIVE_TS_BASE;
1682 entries = av_fast_realloc(*index_entries,
1683 index_entries_allocated_size,
1684 (*nb_index_entries + 1) *
1685 sizeof(AVIndexEntry));
1689 *index_entries = entries;
1691 index = ff_index_search_timestamp(*index_entries, *nb_index_entries,
1692 timestamp, AVSEEK_FLAG_ANY);
1695 index = (*nb_index_entries)++;
1696 ie = &entries[index];
1697 av_assert0(index == 0 || ie[-1].timestamp < timestamp);
1699 ie = &entries[index];
1700 if (ie->timestamp != timestamp) {
1701 if (ie->timestamp <= timestamp)
1703 memmove(entries + index + 1, entries + index,
1704 sizeof(AVIndexEntry) * (*nb_index_entries - index));
1705 (*nb_index_entries)++;
1706 } else if (ie->pos == pos && distance < ie->min_distance)
1707 // do not reduce the distance
1708 distance = ie->min_distance;
1712 ie->timestamp = timestamp;
1713 ie->min_distance = distance;
1720 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1721 int size, int distance, int flags)
1723 timestamp = wrap_timestamp(st, timestamp);
1724 return ff_add_index_entry(&st->index_entries, &st->nb_index_entries,
1725 &st->index_entries_allocated_size, pos,
1726 timestamp, size, distance, flags);
1729 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
1730 int64_t wanted_timestamp, int flags)
1738 // Optimize appending index entries at the end.
1739 if (b && entries[b - 1].timestamp < wanted_timestamp)
1744 timestamp = entries[m].timestamp;
1745 if (timestamp >= wanted_timestamp)
1747 if (timestamp <= wanted_timestamp)
1750 m = (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
1752 if (!(flags & AVSEEK_FLAG_ANY))
1753 while (m >= 0 && m < nb_entries &&
1754 !(entries[m].flags & AVINDEX_KEYFRAME))
1755 m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
1757 if (m == nb_entries)
1762 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp, int flags)
1764 return ff_index_search_timestamp(st->index_entries, st->nb_index_entries,
1765 wanted_timestamp, flags);
1768 static int64_t ff_read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit,
1769 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
1771 int64_t ts = read_timestamp(s, stream_index, ppos, pos_limit);
1772 if (stream_index >= 0)
1773 ts = wrap_timestamp(s->streams[stream_index], ts);
1777 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
1778 int64_t target_ts, int flags)
1780 AVInputFormat *avif = s->iformat;
1781 int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;
1782 int64_t ts_min, ts_max, ts;
1787 if (stream_index < 0)
1790 av_dlog(s, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
1793 ts_min = AV_NOPTS_VALUE;
1794 pos_limit = -1; // GCC falsely says it may be uninitialized.
1796 st = s->streams[stream_index];
1797 if (st->index_entries) {
1800 /* FIXME: Whole function must be checked for non-keyframe entries in
1801 * index case, especially read_timestamp(). */
1802 index = av_index_search_timestamp(st, target_ts,
1803 flags | AVSEEK_FLAG_BACKWARD);
1804 index = FFMAX(index, 0);
1805 e = &st->index_entries[index];
1807 if (e->timestamp <= target_ts || e->pos == e->min_distance) {
1809 ts_min = e->timestamp;
1810 av_dlog(s, "using cached pos_min=0x%"PRIx64" dts_min=%s\n",
1811 pos_min, av_ts2str(ts_min));
1813 av_assert1(index == 0);
1816 index = av_index_search_timestamp(st, target_ts,
1817 flags & ~AVSEEK_FLAG_BACKWARD);
1818 av_assert0(index < st->nb_index_entries);
1820 e = &st->index_entries[index];
1821 av_assert1(e->timestamp >= target_ts);
1823 ts_max = e->timestamp;
1824 pos_limit = pos_max - e->min_distance;
1825 av_dlog(s, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64
1826 " dts_max=%s\n", pos_max, pos_limit, av_ts2str(ts_max));
1830 pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
1831 ts_min, ts_max, flags, &ts, avif->read_timestamp);
1836 if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
1839 ff_read_frame_flush(s);
1840 ff_update_cur_dts(s, st, ts);
1845 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
1846 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
1848 int64_t step = 1024;
1849 int64_t limit, ts_max;
1850 int64_t filesize = avio_size(s->pb);
1851 int64_t pos_max = filesize - 1;
1854 pos_max = FFMAX(0, (pos_max) - step);
1855 ts_max = ff_read_timestamp(s, stream_index,
1856 &pos_max, limit, read_timestamp);
1858 } while (ts_max == AV_NOPTS_VALUE && 2*limit > step);
1859 if (ts_max == AV_NOPTS_VALUE)
1863 int64_t tmp_pos = pos_max + 1;
1864 int64_t tmp_ts = ff_read_timestamp(s, stream_index,
1865 &tmp_pos, INT64_MAX, read_timestamp);
1866 if (tmp_ts == AV_NOPTS_VALUE)
1868 av_assert0(tmp_pos > pos_max);
1871 if (tmp_pos >= filesize)
1883 int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts,
1884 int64_t pos_min, int64_t pos_max, int64_t pos_limit,
1885 int64_t ts_min, int64_t ts_max,
1886 int flags, int64_t *ts_ret,
1887 int64_t (*read_timestamp)(struct AVFormatContext *, int,
1888 int64_t *, int64_t))
1895 av_dlog(s, "gen_seek: %d %s\n", stream_index, av_ts2str(target_ts));
1897 if (ts_min == AV_NOPTS_VALUE) {
1898 pos_min = s->data_offset;
1899 ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
1900 if (ts_min == AV_NOPTS_VALUE)
1904 if (ts_min >= target_ts) {
1909 if (ts_max == AV_NOPTS_VALUE) {
1910 if ((ret = ff_find_last_ts(s, stream_index, &ts_max, &pos_max, read_timestamp)) < 0)
1912 pos_limit = pos_max;
1915 if (ts_max <= target_ts) {
1920 av_assert0(ts_min < ts_max);
1923 while (pos_min < pos_limit) {
1925 "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%s dts_max=%s\n",
1926 pos_min, pos_max, av_ts2str(ts_min), av_ts2str(ts_max));
1927 av_assert0(pos_limit <= pos_max);
1929 if (no_change == 0) {
1930 int64_t approximate_keyframe_distance = pos_max - pos_limit;
1931 // interpolate position (better than dichotomy)
1932 pos = av_rescale(target_ts - ts_min, pos_max - pos_min,
1934 pos_min - approximate_keyframe_distance;
1935 } else if (no_change == 1) {
1936 // bisection if interpolation did not change min / max pos last time
1937 pos = (pos_min + pos_limit) >> 1;
1939 /* linear search if bisection failed, can only happen if there
1940 * are very few or no keyframes between min/max */
1945 else if (pos > pos_limit)
1949 // May pass pos_limit instead of -1.
1950 ts = ff_read_timestamp(s, stream_index, &pos, INT64_MAX, read_timestamp);
1955 av_dlog(s, "%"PRId64" %"PRId64" %"PRId64" / %s %s %s"
1956 " target:%s limit:%"PRId64" start:%"PRId64" noc:%d\n",
1957 pos_min, pos, pos_max,
1958 av_ts2str(ts_min), av_ts2str(ts), av_ts2str(ts_max), av_ts2str(target_ts),
1959 pos_limit, start_pos, no_change);
1960 if (ts == AV_NOPTS_VALUE) {
1961 av_log(s, AV_LOG_ERROR, "read_timestamp() failed in the middle\n");
1964 if (target_ts <= ts) {
1965 pos_limit = start_pos - 1;
1969 if (target_ts >= ts) {
1975 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
1976 ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
1979 ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
1981 ts_max = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
1982 av_dlog(s, "pos=0x%"PRIx64" %s<=%s<=%s\n",
1983 pos, av_ts2str(ts_min), av_ts2str(target_ts), av_ts2str(ts_max));
1989 static int seek_frame_byte(AVFormatContext *s, int stream_index,
1990 int64_t pos, int flags)
1992 int64_t pos_min, pos_max;
1994 pos_min = s->data_offset;
1995 pos_max = avio_size(s->pb) - 1;
1999 else if (pos > pos_max)
2002 avio_seek(s->pb, pos, SEEK_SET);
2004 s->io_repositioned = 1;
2009 static int seek_frame_generic(AVFormatContext *s, int stream_index,
2010 int64_t timestamp, int flags)
2017 st = s->streams[stream_index];
2019 index = av_index_search_timestamp(st, timestamp, flags);
2021 if (index < 0 && st->nb_index_entries &&
2022 timestamp < st->index_entries[0].timestamp)
2025 if (index < 0 || index == st->nb_index_entries - 1) {
2029 if (st->nb_index_entries) {
2030 av_assert0(st->index_entries);
2031 ie = &st->index_entries[st->nb_index_entries - 1];
2032 if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2034 ff_update_cur_dts(s, st, ie->timestamp);
2036 if ((ret = avio_seek(s->pb, s->data_offset, SEEK_SET)) < 0)
2042 read_status = av_read_frame(s, &pkt);
2043 } while (read_status == AVERROR(EAGAIN));
2044 if (read_status < 0)
2046 av_free_packet(&pkt);
2047 if (stream_index == pkt.stream_index && pkt.dts > timestamp) {
2048 if (pkt.flags & AV_PKT_FLAG_KEY)
2050 if (nonkey++ > 1000 && st->codec->codec_id != AV_CODEC_ID_CDGRAPHICS) {
2051 av_log(s, AV_LOG_ERROR,"seek_frame_generic failed as this stream seems to contain no keyframes after the target timestamp, %d non keyframes found\n", nonkey);
2056 index = av_index_search_timestamp(st, timestamp, flags);
2061 ff_read_frame_flush(s);
2062 if (s->iformat->read_seek)
2063 if (s->iformat->read_seek(s, stream_index, timestamp, flags) >= 0)
2065 ie = &st->index_entries[index];
2066 if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2068 ff_update_cur_dts(s, st, ie->timestamp);
2073 static int seek_frame_internal(AVFormatContext *s, int stream_index,
2074 int64_t timestamp, int flags)
2079 if (flags & AVSEEK_FLAG_BYTE) {
2080 if (s->iformat->flags & AVFMT_NO_BYTE_SEEK)
2082 ff_read_frame_flush(s);
2083 return seek_frame_byte(s, stream_index, timestamp, flags);
2086 if (stream_index < 0) {
2087 stream_index = av_find_default_stream_index(s);
2088 if (stream_index < 0)
2091 st = s->streams[stream_index];
2092 /* timestamp for default must be expressed in AV_TIME_BASE units */
2093 timestamp = av_rescale(timestamp, st->time_base.den,
2094 AV_TIME_BASE * (int64_t) st->time_base.num);
2097 /* first, we try the format specific seek */
2098 if (s->iformat->read_seek) {
2099 ff_read_frame_flush(s);
2100 ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
2106 if (s->iformat->read_timestamp &&
2107 !(s->iformat->flags & AVFMT_NOBINSEARCH)) {
2108 ff_read_frame_flush(s);
2109 return ff_seek_frame_binary(s, stream_index, timestamp, flags);
2110 } else if (!(s->iformat->flags & AVFMT_NOGENSEARCH)) {
2111 ff_read_frame_flush(s);
2112 return seek_frame_generic(s, stream_index, timestamp, flags);
2117 int av_seek_frame(AVFormatContext *s, int stream_index,
2118 int64_t timestamp, int flags)
2122 if (s->iformat->read_seek2 && !s->iformat->read_seek) {
2123 int64_t min_ts = INT64_MIN, max_ts = INT64_MAX;
2124 if ((flags & AVSEEK_FLAG_BACKWARD))
2128 return avformat_seek_file(s, stream_index, min_ts, timestamp, max_ts,
2129 flags & ~AVSEEK_FLAG_BACKWARD);
2132 ret = seek_frame_internal(s, stream_index, timestamp, flags);
2135 ret = avformat_queue_attached_pictures(s);
2140 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
2141 int64_t ts, int64_t max_ts, int flags)
2143 if (min_ts > ts || max_ts < ts)
2145 if (stream_index < -1 || stream_index >= (int)s->nb_streams)
2146 return AVERROR(EINVAL);
2149 flags |= AVSEEK_FLAG_ANY;
2150 flags &= ~AVSEEK_FLAG_BACKWARD;
2152 if (s->iformat->read_seek2) {
2154 ff_read_frame_flush(s);
2156 if (stream_index == -1 && s->nb_streams == 1) {
2157 AVRational time_base = s->streams[0]->time_base;
2158 ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
2159 min_ts = av_rescale_rnd(min_ts, time_base.den,
2160 time_base.num * (int64_t)AV_TIME_BASE,
2161 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
2162 max_ts = av_rescale_rnd(max_ts, time_base.den,
2163 time_base.num * (int64_t)AV_TIME_BASE,
2164 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
2167 ret = s->iformat->read_seek2(s, stream_index, min_ts,
2171 ret = avformat_queue_attached_pictures(s);
2175 if (s->iformat->read_timestamp) {
2176 // try to seek via read_timestamp()
2179 // Fall back on old API if new is not implemented but old is.
2180 // Note the old API has somewhat different semantics.
2181 if (s->iformat->read_seek || 1) {
2182 int dir = (ts - (uint64_t)min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);
2183 int ret = av_seek_frame(s, stream_index, ts, flags | dir);
2184 if (ret<0 && ts != min_ts && max_ts != ts) {
2185 ret = av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);
2187 ret = av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));
2192 // try some generic seek like seek_frame_generic() but with new ts semantics
2193 return -1; //unreachable
2196 /*******************************************************/
2199 * Return TRUE if the stream has accurate duration in any stream.
2201 * @return TRUE if the stream has accurate duration for at least one component.
2203 static int has_duration(AVFormatContext *ic)
2208 for (i = 0; i < ic->nb_streams; i++) {
2209 st = ic->streams[i];
2210 if (st->duration != AV_NOPTS_VALUE)
2213 if (ic->duration != AV_NOPTS_VALUE)
2219 * Estimate the stream timings from the one of each components.
2221 * Also computes the global bitrate if possible.
2223 static void update_stream_timings(AVFormatContext *ic)
2225 int64_t start_time, start_time1, start_time_text, end_time, end_time1;
2226 int64_t duration, duration1, filesize;
2231 start_time = INT64_MAX;
2232 start_time_text = INT64_MAX;
2233 end_time = INT64_MIN;
2234 duration = INT64_MIN;
2235 for (i = 0; i < ic->nb_streams; i++) {
2236 st = ic->streams[i];
2237 if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
2238 start_time1 = av_rescale_q(st->start_time, st->time_base,
2240 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE || st->codec->codec_type == AVMEDIA_TYPE_DATA) {
2241 if (start_time1 < start_time_text)
2242 start_time_text = start_time1;
2244 start_time = FFMIN(start_time, start_time1);
2245 end_time1 = AV_NOPTS_VALUE;
2246 if (st->duration != AV_NOPTS_VALUE) {
2247 end_time1 = start_time1 +
2248 av_rescale_q(st->duration, st->time_base,
2250 end_time = FFMAX(end_time, end_time1);
2252 for (p = NULL; (p = av_find_program_from_stream(ic, p, i)); ) {
2253 if (p->start_time == AV_NOPTS_VALUE || p->start_time > start_time1)
2254 p->start_time = start_time1;
2255 if (p->end_time < end_time1)
2256 p->end_time = end_time1;
2259 if (st->duration != AV_NOPTS_VALUE) {
2260 duration1 = av_rescale_q(st->duration, st->time_base,
2262 duration = FFMAX(duration, duration1);
2265 if (start_time == INT64_MAX || (start_time > start_time_text && start_time - start_time_text < AV_TIME_BASE))
2266 start_time = start_time_text;
2267 else if (start_time > start_time_text)
2268 av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream starttime %f\n", start_time_text / (float)AV_TIME_BASE);
2270 if (start_time != INT64_MAX) {
2271 ic->start_time = start_time;
2272 if (end_time != INT64_MIN) {
2273 if (ic->nb_programs) {
2274 for (i = 0; i < ic->nb_programs; i++) {
2275 p = ic->programs[i];
2276 if (p->start_time != AV_NOPTS_VALUE && p->end_time > p->start_time)
2277 duration = FFMAX(duration, p->end_time - p->start_time);
2280 duration = FFMAX(duration, end_time - start_time);
2283 if (duration != INT64_MIN && duration > 0 && ic->duration == AV_NOPTS_VALUE) {
2284 ic->duration = duration;
2286 if (ic->pb && (filesize = avio_size(ic->pb)) > 0 && ic->duration != AV_NOPTS_VALUE) {
2287 /* compute the bitrate */
2288 double bitrate = (double) filesize * 8.0 * AV_TIME_BASE /
2289 (double) ic->duration;
2290 if (bitrate >= 0 && bitrate <= INT_MAX)
2291 ic->bit_rate = bitrate;
2295 static void fill_all_stream_timings(AVFormatContext *ic)
2300 update_stream_timings(ic);
2301 for (i = 0; i < ic->nb_streams; i++) {
2302 st = ic->streams[i];
2303 if (st->start_time == AV_NOPTS_VALUE) {
2304 if (ic->start_time != AV_NOPTS_VALUE)
2305 st->start_time = av_rescale_q(ic->start_time, AV_TIME_BASE_Q,
2307 if (ic->duration != AV_NOPTS_VALUE)
2308 st->duration = av_rescale_q(ic->duration, AV_TIME_BASE_Q,
2314 static void estimate_timings_from_bit_rate(AVFormatContext *ic)
2316 int64_t filesize, duration;
2317 int i, show_warning = 0;
2320 /* if bit_rate is already set, we believe it */
2321 if (ic->bit_rate <= 0) {
2323 for (i = 0; i < ic->nb_streams; i++) {
2324 st = ic->streams[i];
2325 if (st->codec->bit_rate > 0) {
2326 if (INT_MAX - st->codec->bit_rate < bit_rate) {
2330 bit_rate += st->codec->bit_rate;
2333 ic->bit_rate = bit_rate;
2336 /* if duration is already set, we believe it */
2337 if (ic->duration == AV_NOPTS_VALUE &&
2338 ic->bit_rate != 0) {
2339 filesize = ic->pb ? avio_size(ic->pb) : 0;
2340 if (filesize > ic->data_offset) {
2341 filesize -= ic->data_offset;
2342 for (i = 0; i < ic->nb_streams; i++) {
2343 st = ic->streams[i];
2344 if ( st->time_base.num <= INT64_MAX / ic->bit_rate
2345 && st->duration == AV_NOPTS_VALUE) {
2346 duration = av_rescale(8 * filesize, st->time_base.den,
2348 (int64_t) st->time_base.num);
2349 st->duration = duration;
2356 av_log(ic, AV_LOG_WARNING,
2357 "Estimating duration from bitrate, this may be inaccurate\n");
2360 #define DURATION_MAX_READ_SIZE 250000LL
2361 #define DURATION_MAX_RETRY 4
2363 /* only usable for MPEG-PS streams */
2364 static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
2366 AVPacket pkt1, *pkt = &pkt1;
2368 int num, den, read_size, i, ret;
2369 int found_duration = 0;
2371 int64_t filesize, offset, duration;
2374 /* flush packet queue */
2375 flush_packet_queue(ic);
2377 for (i = 0; i < ic->nb_streams; i++) {
2378 st = ic->streams[i];
2379 if (st->start_time == AV_NOPTS_VALUE &&
2380 st->first_dts == AV_NOPTS_VALUE &&
2381 st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN)
2382 av_log(st->codec, AV_LOG_WARNING,
2383 "start time for stream %d is not set in estimate_timings_from_pts\n", i);
2386 av_parser_close(st->parser);
2391 av_opt_set(ic, "skip_changes", "1", AV_OPT_SEARCH_CHILDREN);
2392 /* estimate the end time (duration) */
2393 /* XXX: may need to support wrapping */
2394 filesize = ic->pb ? avio_size(ic->pb) : 0;
2396 is_end = found_duration;
2397 offset = filesize - (DURATION_MAX_READ_SIZE << retry);
2401 avio_seek(ic->pb, offset, SEEK_SET);
2404 if (read_size >= DURATION_MAX_READ_SIZE << (FFMAX(retry - 1, 0)))
2408 ret = ff_read_packet(ic, pkt);
2409 } while (ret == AVERROR(EAGAIN));
2412 read_size += pkt->size;
2413 st = ic->streams[pkt->stream_index];
2414 if (pkt->pts != AV_NOPTS_VALUE &&
2415 (st->start_time != AV_NOPTS_VALUE ||
2416 st->first_dts != AV_NOPTS_VALUE)) {
2417 if (pkt->duration == 0) {
2418 ff_compute_frame_duration(ic, &num, &den, st, st->parser, pkt);
2420 pkt->duration = av_rescale_rnd(1,
2421 num * (int64_t) st->time_base.den,
2422 den * (int64_t) st->time_base.num,
2426 duration = pkt->pts + pkt->duration;
2428 if (st->start_time != AV_NOPTS_VALUE)
2429 duration -= st->start_time;
2431 duration -= st->first_dts;
2433 if (st->duration == AV_NOPTS_VALUE || st->info->last_duration<= 0 ||
2434 (st->duration < duration && FFABS(duration - st->info->last_duration) < 60LL*st->time_base.den / st->time_base.num))
2435 st->duration = duration;
2436 st->info->last_duration = duration;
2439 av_free_packet(pkt);
2442 /* check if all audio/video streams have valid duration */
2445 for (i = 0; i < ic->nb_streams; i++) {
2446 st = ic->streams[i];
2447 switch (st->codec->codec_type) {
2448 case AVMEDIA_TYPE_VIDEO:
2449 case AVMEDIA_TYPE_AUDIO:
2450 if (st->duration == AV_NOPTS_VALUE)
2457 ++retry <= DURATION_MAX_RETRY);
2459 av_opt_set(ic, "skip_changes", "0", AV_OPT_SEARCH_CHILDREN);
2461 /* warn about audio/video streams which duration could not be estimated */
2462 for (i = 0; i < ic->nb_streams; i++) {
2463 st = ic->streams[i];
2464 if (st->duration == AV_NOPTS_VALUE) {
2465 switch (st->codec->codec_type) {
2466 case AVMEDIA_TYPE_VIDEO:
2467 case AVMEDIA_TYPE_AUDIO:
2468 if (st->start_time != AV_NOPTS_VALUE || st->first_dts != AV_NOPTS_VALUE) {
2469 av_log(ic, AV_LOG_DEBUG, "stream %d : no PTS found at end of file, duration not set\n", i);
2471 av_log(ic, AV_LOG_DEBUG, "stream %d : no TS found at start of file, duration not set\n", i);
2475 fill_all_stream_timings(ic);
2477 avio_seek(ic->pb, old_offset, SEEK_SET);
2478 for (i = 0; i < ic->nb_streams; i++) {
2481 st = ic->streams[i];
2482 st->cur_dts = st->first_dts;
2483 st->last_IP_pts = AV_NOPTS_VALUE;
2484 st->last_dts_for_order_check = AV_NOPTS_VALUE;
2485 for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
2486 st->pts_buffer[j] = AV_NOPTS_VALUE;
2490 static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
2494 /* get the file size, if possible */
2495 if (ic->iformat->flags & AVFMT_NOFILE) {
2498 file_size = avio_size(ic->pb);
2499 file_size = FFMAX(0, file_size);
2502 if ((!strcmp(ic->iformat->name, "mpeg") ||
2503 !strcmp(ic->iformat->name, "mpegts")) &&
2504 file_size && ic->pb->seekable) {
2505 /* get accurate estimate from the PTSes */
2506 estimate_timings_from_pts(ic, old_offset);
2507 ic->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
2508 } else if (has_duration(ic)) {
2509 /* at least one component has timings - we use them for all
2511 fill_all_stream_timings(ic);
2512 ic->duration_estimation_method = AVFMT_DURATION_FROM_STREAM;
2514 /* less precise: use bitrate info */
2515 estimate_timings_from_bit_rate(ic);
2516 ic->duration_estimation_method = AVFMT_DURATION_FROM_BITRATE;
2518 update_stream_timings(ic);
2522 AVStream av_unused *st;
2523 for (i = 0; i < ic->nb_streams; i++) {
2524 st = ic->streams[i];
2525 av_dlog(ic, "%d: start_time: %0.3f duration: %0.3f\n", i,
2526 (double) st->start_time / AV_TIME_BASE,
2527 (double) st->duration / AV_TIME_BASE);
2530 "stream: start_time: %0.3f duration: %0.3f bitrate=%d kb/s\n",
2531 (double) ic->start_time / AV_TIME_BASE,
2532 (double) ic->duration / AV_TIME_BASE,
2533 ic->bit_rate / 1000);
2537 static int has_codec_parameters(AVStream *st, const char **errmsg_ptr)
2539 AVCodecContext *avctx = st->codec;
2541 #define FAIL(errmsg) do { \
2543 *errmsg_ptr = errmsg; \
2547 if ( avctx->codec_id == AV_CODEC_ID_NONE
2548 && avctx->codec_type != AVMEDIA_TYPE_DATA)
2549 FAIL("unknown codec");
2550 switch (avctx->codec_type) {
2551 case AVMEDIA_TYPE_AUDIO:
2552 if (!avctx->frame_size && determinable_frame_size(avctx))
2553 FAIL("unspecified frame size");
2554 if (st->info->found_decoder >= 0 &&
2555 avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
2556 FAIL("unspecified sample format");
2557 if (!avctx->sample_rate)
2558 FAIL("unspecified sample rate");
2559 if (!avctx->channels)
2560 FAIL("unspecified number of channels");
2561 if (st->info->found_decoder >= 0 && !st->nb_decoded_frames && avctx->codec_id == AV_CODEC_ID_DTS)
2562 FAIL("no decodable DTS frames");
2564 case AVMEDIA_TYPE_VIDEO:
2566 FAIL("unspecified size");
2567 if (st->info->found_decoder >= 0 && avctx->pix_fmt == AV_PIX_FMT_NONE)
2568 FAIL("unspecified pixel format");
2569 if (st->codec->codec_id == AV_CODEC_ID_RV30 || st->codec->codec_id == AV_CODEC_ID_RV40)
2570 if (!st->sample_aspect_ratio.num && !st->codec->sample_aspect_ratio.num && !st->codec_info_nb_frames)
2571 FAIL("no frame in rv30/40 and no sar");
2573 case AVMEDIA_TYPE_SUBTITLE:
2574 if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
2575 FAIL("unspecified size");
2577 case AVMEDIA_TYPE_DATA:
2578 if (avctx->codec_id == AV_CODEC_ID_NONE) return 1;
2584 /* returns 1 or 0 if or if not decoded data was returned, or a negative error */
2585 static int try_decode_frame(AVFormatContext *s, AVStream *st, AVPacket *avpkt,
2586 AVDictionary **options)
2588 const AVCodec *codec;
2589 int got_picture = 1, ret = 0;
2590 AVFrame *frame = av_frame_alloc();
2591 AVSubtitle subtitle;
2592 AVPacket pkt = *avpkt;
2595 return AVERROR(ENOMEM);
2597 if (!avcodec_is_open(st->codec) &&
2598 st->info->found_decoder <= 0 &&
2599 (st->codec->codec_id != -st->info->found_decoder || !st->codec->codec_id)) {
2600 AVDictionary *thread_opt = NULL;
2602 codec = find_decoder(s, st, st->codec->codec_id);
2605 st->info->found_decoder = -st->codec->codec_id;
2610 /* Force thread count to 1 since the H.264 decoder will not extract
2611 * SPS and PPS to extradata during multi-threaded decoding. */
2612 av_dict_set(options ? options : &thread_opt, "threads", "1", 0);
2613 if (s->codec_whitelist)
2614 av_dict_set(options ? options : &thread_opt, "codec_whitelist", s->codec_whitelist, 0);
2615 ret = avcodec_open2(st->codec, codec, options ? options : &thread_opt);
2617 av_dict_free(&thread_opt);
2619 st->info->found_decoder = -st->codec->codec_id;
2622 st->info->found_decoder = 1;
2623 } else if (!st->info->found_decoder)
2624 st->info->found_decoder = 1;
2626 if (st->info->found_decoder < 0) {
2631 while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
2633 (!has_codec_parameters(st, NULL) || !has_decode_delay_been_guessed(st) ||
2634 (!st->codec_info_nb_frames &&
2635 st->codec->codec->capabilities & CODEC_CAP_CHANNEL_CONF))) {
2637 switch (st->codec->codec_type) {
2638 case AVMEDIA_TYPE_VIDEO:
2639 ret = avcodec_decode_video2(st->codec, frame,
2640 &got_picture, &pkt);
2642 case AVMEDIA_TYPE_AUDIO:
2643 ret = avcodec_decode_audio4(st->codec, frame, &got_picture, &pkt);
2645 case AVMEDIA_TYPE_SUBTITLE:
2646 ret = avcodec_decode_subtitle2(st->codec, &subtitle,
2647 &got_picture, &pkt);
2655 st->nb_decoded_frames++;
2662 if (!pkt.data && !got_picture)
2666 av_frame_free(&frame);
2670 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
2672 while (tags->id != AV_CODEC_ID_NONE) {
2680 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
2683 for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
2684 if (tag == tags[i].tag)
2686 for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
2687 if (avpriv_toupper4(tag) == avpriv_toupper4(tags[i].tag))
2689 return AV_CODEC_ID_NONE;
2692 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
2697 return be ? AV_CODEC_ID_PCM_F32BE : AV_CODEC_ID_PCM_F32LE;
2699 return be ? AV_CODEC_ID_PCM_F64BE : AV_CODEC_ID_PCM_F64LE;
2701 return AV_CODEC_ID_NONE;
2706 if (sflags & (1 << (bps - 1))) {
2709 return AV_CODEC_ID_PCM_S8;
2711 return be ? AV_CODEC_ID_PCM_S16BE : AV_CODEC_ID_PCM_S16LE;
2713 return be ? AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
2715 return be ? AV_CODEC_ID_PCM_S32BE : AV_CODEC_ID_PCM_S32LE;
2717 return AV_CODEC_ID_NONE;
2722 return AV_CODEC_ID_PCM_U8;
2724 return be ? AV_CODEC_ID_PCM_U16BE : AV_CODEC_ID_PCM_U16LE;
2726 return be ? AV_CODEC_ID_PCM_U24BE : AV_CODEC_ID_PCM_U24LE;
2728 return be ? AV_CODEC_ID_PCM_U32BE : AV_CODEC_ID_PCM_U32LE;
2730 return AV_CODEC_ID_NONE;
2736 unsigned int av_codec_get_tag(const AVCodecTag *const *tags, enum AVCodecID id)
2739 if (!av_codec_get_tag2(tags, id, &tag))
2744 int av_codec_get_tag2(const AVCodecTag * const *tags, enum AVCodecID id,
2748 for (i = 0; tags && tags[i]; i++) {
2749 const AVCodecTag *codec_tags = tags[i];
2750 while (codec_tags->id != AV_CODEC_ID_NONE) {
2751 if (codec_tags->id == id) {
2752 *tag = codec_tags->tag;
2761 enum AVCodecID av_codec_get_id(const AVCodecTag *const *tags, unsigned int tag)
2764 for (i = 0; tags && tags[i]; i++) {
2765 enum AVCodecID id = ff_codec_get_id(tags[i], tag);
2766 if (id != AV_CODEC_ID_NONE)
2769 return AV_CODEC_ID_NONE;
2772 static void compute_chapters_end(AVFormatContext *s)
2775 int64_t max_time = s->duration +
2776 ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
2778 for (i = 0; i < s->nb_chapters; i++)
2779 if (s->chapters[i]->end == AV_NOPTS_VALUE) {
2780 AVChapter *ch = s->chapters[i];
2781 int64_t end = max_time ? av_rescale_q(max_time, AV_TIME_BASE_Q,
2785 for (j = 0; j < s->nb_chapters; j++) {
2786 AVChapter *ch1 = s->chapters[j];
2787 int64_t next_start = av_rescale_q(ch1->start, ch1->time_base,
2789 if (j != i && next_start > ch->start && next_start < end)
2792 ch->end = (end == INT64_MAX) ? ch->start : end;
2796 static int get_std_framerate(int i)
2799 return (i + 1) * 1001;
2803 return ((const int[]) { 40, 48, 50, 60, 80, 120, 240})[i] * 1001 * 12;
2807 return ((const int[]) { 24, 30, 60, 12, 15, 48 })[i] * 1000 * 12;
2810 /* Is the time base unreliable?
2811 * This is a heuristic to balance between quick acceptance of the values in
2812 * the headers vs. some extra checks.
2813 * Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
2814 * MPEG-2 commonly misuses field repeat flags to store different framerates.
2815 * And there are "variable" fps files this needs to detect as well. */
2816 static int tb_unreliable(AVCodecContext *c)
2818 if (c->time_base.den >= 101L * c->time_base.num ||
2819 c->time_base.den < 5L * c->time_base.num ||
2820 // c->codec_tag == AV_RL32("DIVX") ||
2821 // c->codec_tag == AV_RL32("XVID") ||
2822 c->codec_tag == AV_RL32("mp4v") ||
2823 c->codec_id == AV_CODEC_ID_MPEG2VIDEO ||
2824 c->codec_id == AV_CODEC_ID_GIF ||
2825 c->codec_id == AV_CODEC_ID_H264)
2830 int ff_alloc_extradata(AVCodecContext *avctx, int size)
2834 if (size < 0 || size >= INT32_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {
2835 avctx->extradata_size = 0;
2836 return AVERROR(EINVAL);
2838 avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
2839 if (avctx->extradata) {
2840 memset(avctx->extradata + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2841 avctx->extradata_size = size;
2844 avctx->extradata_size = 0;
2845 ret = AVERROR(ENOMEM);
2850 int ff_get_extradata(AVCodecContext *avctx, AVIOContext *pb, int size)
2852 int ret = ff_alloc_extradata(avctx, size);
2855 ret = avio_read(pb, avctx->extradata, size);
2857 av_freep(&avctx->extradata);
2858 avctx->extradata_size = 0;
2859 av_log(avctx, AV_LOG_ERROR, "Failed to read extradata of size %d\n", size);
2860 return ret < 0 ? ret : AVERROR_INVALIDDATA;
2866 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
2869 int64_t last = st->info->last_dts;
2871 if ( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
2872 && ts - (uint64_t)last < INT64_MAX) {
2873 double dts = (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
2874 int64_t duration = ts - last;
2876 if (!st->info->duration_error)
2877 st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
2878 if (!st->info->duration_error)
2879 return AVERROR(ENOMEM);
2881 // if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
2882 // av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
2883 for (i = 0; i<MAX_STD_TIMEBASES; i++) {
2884 if (st->info->duration_error[0][1][i] < 1e10) {
2885 int framerate = get_std_framerate(i);
2886 double sdts = dts*framerate/(1001*12);
2887 for (j= 0; j<2; j++) {
2888 int64_t ticks = llrint(sdts+j*0.5);
2889 double error= sdts - ticks + j*0.5;
2890 st->info->duration_error[j][0][i] += error;
2891 st->info->duration_error[j][1][i] += error*error;
2895 st->info->duration_count++;
2896 st->info->rfps_duration_sum += duration;
2898 if (st->info->duration_count % 10 == 0) {
2899 int n = st->info->duration_count;
2900 for (i = 0; i<MAX_STD_TIMEBASES; i++) {
2901 if (st->info->duration_error[0][1][i] < 1e10) {
2902 double a0 = st->info->duration_error[0][0][i] / n;
2903 double error0 = st->info->duration_error[0][1][i] / n - a0*a0;
2904 double a1 = st->info->duration_error[1][0][i] / n;
2905 double error1 = st->info->duration_error[1][1][i] / n - a1*a1;
2906 if (error0 > 0.04 && error1 > 0.04) {
2907 st->info->duration_error[0][1][i] = 2e10;
2908 st->info->duration_error[1][1][i] = 2e10;
2914 // ignore the first 4 values, they might have some random jitter
2915 if (st->info->duration_count > 3 && is_relative(ts) == is_relative(last))
2916 st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
2918 if (ts != AV_NOPTS_VALUE)
2919 st->info->last_dts = ts;
2924 void ff_rfps_calculate(AVFormatContext *ic)
2928 for (i = 0; i < ic->nb_streams; i++) {
2929 AVStream *st = ic->streams[i];
2931 if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO)
2933 // the check for tb_unreliable() is not completely correct, since this is not about handling
2934 // a unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
2935 // ipmovie.c produces.
2936 if (tb_unreliable(st->codec) && st->info->duration_count > 15 && st->info->duration_gcd > FFMAX(1, st->time_base.den/(500LL*st->time_base.num)) && !st->r_frame_rate.num)
2937 av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, st->time_base.den, st->time_base.num * st->info->duration_gcd, INT_MAX);
2938 if (st->info->duration_count>1 && !st->r_frame_rate.num
2939 && tb_unreliable(st->codec)) {
2941 double best_error= 0.01;
2942 AVRational ref_rate = st->r_frame_rate.num ? st->r_frame_rate : av_inv_q(st->time_base);
2944 for (j= 0; j<MAX_STD_TIMEBASES; j++) {
2947 if (st->info->codec_info_duration && st->info->codec_info_duration*av_q2d(st->time_base) < (1001*12.0)/get_std_framerate(j))
2949 if (!st->info->codec_info_duration && 1.0 < (1001*12.0)/get_std_framerate(j))
2952 if (av_q2d(st->time_base) * st->info->rfps_duration_sum / st->info->duration_count < (1001*12.0 * 0.8)/get_std_framerate(j))
2955 for (k= 0; k<2; k++) {
2956 int n = st->info->duration_count;
2957 double a= st->info->duration_error[k][0][j] / n;
2958 double error= st->info->duration_error[k][1][j]/n - a*a;
2960 if (error < best_error && best_error> 0.000000001) {
2962 num = get_std_framerate(j);
2965 av_log(NULL, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
2968 // do not increase frame rate by more than 1 % in order to match a standard rate.
2969 if (num && (!ref_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(ref_rate)))
2970 av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
2972 if ( !st->avg_frame_rate.num
2973 && st->r_frame_rate.num && st->info->rfps_duration_sum
2974 && st->info->codec_info_duration <= 0
2975 && st->info->duration_count > 2
2976 && fabs(1.0 / (av_q2d(st->r_frame_rate) * av_q2d(st->time_base)) - st->info->rfps_duration_sum / (double)st->info->duration_count) <= 1.0
2978 av_log(ic, AV_LOG_DEBUG, "Setting avg frame rate based on r frame rate\n");
2979 st->avg_frame_rate = st->r_frame_rate;
2982 av_freep(&st->info->duration_error);
2983 st->info->last_dts = AV_NOPTS_VALUE;
2984 st->info->duration_count = 0;
2985 st->info->rfps_duration_sum = 0;
2989 int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
2991 int i, count, ret = 0, j;
2994 AVPacket pkt1, *pkt;
2995 int64_t old_offset = avio_tell(ic->pb);
2996 // new streams might appear, no options for those
2997 int orig_nb_streams = ic->nb_streams;
2999 int64_t max_analyze_duration = ic->max_analyze_duration2;
3000 int64_t max_stream_analyze_duration;
3001 int64_t probesize = ic->probesize2;
3003 if (!max_analyze_duration)
3004 max_analyze_duration = ic->max_analyze_duration;
3006 probesize = ic->probesize;
3007 flush_codecs = probesize > 0;
3009 av_opt_set(ic, "skip_clear", "1", AV_OPT_SEARCH_CHILDREN);
3011 max_stream_analyze_duration = max_analyze_duration;
3012 if (!max_analyze_duration) {
3013 max_stream_analyze_duration =
3014 max_analyze_duration = 5*AV_TIME_BASE;
3015 if (!strcmp(ic->iformat->name, "flv"))
3016 max_stream_analyze_duration = 30*AV_TIME_BASE;
3020 av_log(ic, AV_LOG_DEBUG, "Before avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d\n",
3021 avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count);
3023 for (i = 0; i < ic->nb_streams; i++) {
3024 const AVCodec *codec;
3025 AVDictionary *thread_opt = NULL;
3026 st = ic->streams[i];
3028 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO ||
3029 st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
3030 /* if (!st->time_base.num)
3032 if (!st->codec->time_base.num)
3033 st->codec->time_base = st->time_base;
3035 // only for the split stuff
3036 if (!st->parser && !(ic->flags & AVFMT_FLAG_NOPARSE)) {
3037 st->parser = av_parser_init(st->codec->codec_id);
3039 if (st->need_parsing == AVSTREAM_PARSE_HEADERS) {
3040 st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
3041 } else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW) {
3042 st->parser->flags |= PARSER_FLAG_USE_CODEC_TS;
3044 } else if (st->need_parsing) {
3045 av_log(ic, AV_LOG_VERBOSE, "parser not found for codec "
3046 "%s, packets or times may be invalid.\n",
3047 avcodec_get_name(st->codec->codec_id));
3050 codec = find_decoder(ic, st, st->codec->codec_id);
3052 /* Force thread count to 1 since the H.264 decoder will not extract
3053 * SPS and PPS to extradata during multi-threaded decoding. */
3054 av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
3056 if (ic->codec_whitelist)
3057 av_dict_set(options ? &options[i] : &thread_opt, "codec_whitelist", ic->codec_whitelist, 0);
3059 /* Ensure that subtitle_header is properly set. */
3060 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
3061 && codec && !st->codec->codec) {
3062 if (avcodec_open2(st->codec, codec, options ? &options[i] : &thread_opt) < 0)
3063 av_log(ic, AV_LOG_WARNING,
3064 "Failed to open codec in av_find_stream_info\n");
3067 // Try to just open decoders, in case this is enough to get parameters.
3068 if (!has_codec_parameters(st, NULL) && st->request_probe <= 0) {
3069 if (codec && !st->codec->codec)
3070 if (avcodec_open2(st->codec, codec, options ? &options[i] : &thread_opt) < 0)
3071 av_log(ic, AV_LOG_WARNING,
3072 "Failed to open codec in av_find_stream_info\n");
3075 av_dict_free(&thread_opt);
3078 for (i = 0; i < ic->nb_streams; i++) {
3079 #if FF_API_R_FRAME_RATE
3080 ic->streams[i]->info->last_dts = AV_NOPTS_VALUE;
3082 ic->streams[i]->info->fps_first_dts = AV_NOPTS_VALUE;
3083 ic->streams[i]->info->fps_last_dts = AV_NOPTS_VALUE;
3089 int analyzed_all_streams;
3090 if (ff_check_interrupt(&ic->interrupt_callback)) {
3092 av_log(ic, AV_LOG_DEBUG, "interrupted\n");
3096 /* check if one codec still needs to be handled */
3097 for (i = 0; i < ic->nb_streams; i++) {
3098 int fps_analyze_framecount = 20;
3100 st = ic->streams[i];
3101 if (!has_codec_parameters(st, NULL))
3103 /* If the timebase is coarse (like the usual millisecond precision
3104 * of mkv), we need to analyze more frames to reliably arrive at
3105 * the correct fps. */
3106 if (av_q2d(st->time_base) > 0.0005)
3107 fps_analyze_framecount *= 2;
3108 if (!tb_unreliable(st->codec))
3109 fps_analyze_framecount = 0;
3110 if (ic->fps_probe_size >= 0)
3111 fps_analyze_framecount = ic->fps_probe_size;
3112 if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)
3113 fps_analyze_framecount = 0;
3114 /* variable fps and no guess at the real fps */
3115 if (!(st->r_frame_rate.num && st->avg_frame_rate.num) &&
3116 st->info->duration_count < fps_analyze_framecount &&
3117 st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
3119 if (st->parser && st->parser->parser->split &&
3120 !st->codec->extradata)
3122 if (st->first_dts == AV_NOPTS_VALUE &&
3123 !(ic->iformat->flags & AVFMT_NOTIMESTAMPS) &&
3124 st->codec_info_nb_frames < ic->max_ts_probe &&
3125 (st->codec->codec_type == AVMEDIA_TYPE_VIDEO ||
3126 st->codec->codec_type == AVMEDIA_TYPE_AUDIO))
3129 analyzed_all_streams = 0;
3130 if (i == ic->nb_streams) {
3131 analyzed_all_streams = 1;
3132 /* NOTE: If the format has no header, then we need to read some
3133 * packets to get most of the streams, so we cannot stop here. */
3134 if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
3135 /* If we found the info for all the codecs, we can stop. */
3137 av_log(ic, AV_LOG_DEBUG, "All info found\n");
3142 /* We did not get all the codec info, but we read too much data. */
3143 if (read_size >= probesize) {
3145 av_log(ic, AV_LOG_DEBUG,
3146 "Probe buffer size limit of %"PRId64" bytes reached\n", probesize);
3147 for (i = 0; i < ic->nb_streams; i++)
3148 if (!ic->streams[i]->r_frame_rate.num &&
3149 ic->streams[i]->info->duration_count <= 1 &&
3150 ic->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
3151 strcmp(ic->iformat->name, "image2"))
3152 av_log(ic, AV_LOG_WARNING,
3153 "Stream #%d: not enough frames to estimate rate; "
3154 "consider increasing probesize\n", i);
3158 /* NOTE: A new stream can be added there if no header in file
3159 * (AVFMTCTX_NOHEADER). */
3160 ret = read_frame_internal(ic, &pkt1);
3161 if (ret == AVERROR(EAGAIN))
3169 if (ic->flags & AVFMT_FLAG_NOBUFFER)
3170 free_packet_buffer(&ic->packet_buffer, &ic->packet_buffer_end);
3172 pkt = add_to_pktbuf(&ic->packet_buffer, &pkt1,
3173 &ic->packet_buffer_end);
3175 ret = AVERROR(ENOMEM);
3176 goto find_stream_info_err;
3178 if ((ret = av_dup_packet(pkt)) < 0)
3179 goto find_stream_info_err;
3182 st = ic->streams[pkt->stream_index];
3183 if (!(st->disposition & AV_DISPOSITION_ATTACHED_PIC))
3184 read_size += pkt->size;
3186 if (pkt->dts != AV_NOPTS_VALUE && st->codec_info_nb_frames > 1) {
3187 /* check for non-increasing dts */
3188 if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3189 st->info->fps_last_dts >= pkt->dts) {
3190 av_log(ic, AV_LOG_DEBUG,
3191 "Non-increasing DTS in stream %d: packet %d with DTS "
3192 "%"PRId64", packet %d with DTS %"PRId64"\n",
3193 st->index, st->info->fps_last_dts_idx,
3194 st->info->fps_last_dts, st->codec_info_nb_frames,
3196 st->info->fps_first_dts =
3197 st->info->fps_last_dts = AV_NOPTS_VALUE;
3199 /* Check for a discontinuity in dts. If the difference in dts
3200 * is more than 1000 times the average packet duration in the
3201 * sequence, we treat it as a discontinuity. */
3202 if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3203 st->info->fps_last_dts_idx > st->info->fps_first_dts_idx &&
3204 (pkt->dts - st->info->fps_last_dts) / 1000 >
3205 (st->info->fps_last_dts - st->info->fps_first_dts) /
3206 (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
3207 av_log(ic, AV_LOG_WARNING,
3208 "DTS discontinuity in stream %d: packet %d with DTS "
3209 "%"PRId64", packet %d with DTS %"PRId64"\n",
3210 st->index, st->info->fps_last_dts_idx,
3211 st->info->fps_last_dts, st->codec_info_nb_frames,
3213 st->info->fps_first_dts =
3214 st->info->fps_last_dts = AV_NOPTS_VALUE;
3217 /* update stored dts values */
3218 if (st->info->fps_first_dts == AV_NOPTS_VALUE) {
3219 st->info->fps_first_dts = pkt->dts;
3220 st->info->fps_first_dts_idx = st->codec_info_nb_frames;
3222 st->info->fps_last_dts = pkt->dts;
3223 st->info->fps_last_dts_idx = st->codec_info_nb_frames;
3225 if (st->codec_info_nb_frames>1) {
3228 if (st->time_base.den > 0)
3229 t = av_rescale_q(st->info->codec_info_duration, st->time_base, AV_TIME_BASE_Q);
3230 if (st->avg_frame_rate.num > 0)
3231 t = FFMAX(t, av_rescale_q(st->codec_info_nb_frames, av_inv_q(st->avg_frame_rate), AV_TIME_BASE_Q));
3234 && st->codec_info_nb_frames>30
3235 && st->info->fps_first_dts != AV_NOPTS_VALUE
3236 && st->info->fps_last_dts != AV_NOPTS_VALUE)
3237 t = FFMAX(t, av_rescale_q(st->info->fps_last_dts - st->info->fps_first_dts, st->time_base, AV_TIME_BASE_Q));
3239 if (t >= (analyzed_all_streams ? max_analyze_duration : max_stream_analyze_duration)) {
3240 av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds\n",
3241 max_analyze_duration,
3243 if (ic->flags & AVFMT_FLAG_NOBUFFER)
3244 av_packet_unref(pkt);
3247 if (pkt->duration) {
3248 st->info->codec_info_duration += pkt->duration;
3249 st->info->codec_info_duration_fields += st->parser && st->need_parsing && st->codec->ticks_per_frame ==2 ? st->parser->repeat_pict + 1 : 2;
3252 #if FF_API_R_FRAME_RATE
3253 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
3254 ff_rfps_add_frame(ic, st, pkt->dts);
3256 if (st->parser && st->parser->parser->split && !st->codec->extradata) {
3257 int i = st->parser->parser->split(st->codec, pkt->data, pkt->size);
3258 if (i > 0 && i < FF_MAX_EXTRADATA_SIZE) {
3259 if (ff_alloc_extradata(st->codec, i))
3260 return AVERROR(ENOMEM);
3261 memcpy(st->codec->extradata, pkt->data,
3262 st->codec->extradata_size);
3266 /* If still no information, we try to open the codec and to
3267 * decompress the frame. We try to avoid that in most cases as
3268 * it takes longer and uses more memory. For MPEG-4, we need to
3269 * decompress for QuickTime.
3271 * If CODEC_CAP_CHANNEL_CONF is set this will force decoding of at
3272 * least one frame of codec data, this makes sure the codec initializes
3273 * the channel configuration and does not only trust the values from
3275 try_decode_frame(ic, st, pkt,
3276 (options && i < orig_nb_streams) ? &options[i] : NULL);
3278 if (ic->flags & AVFMT_FLAG_NOBUFFER)
3279 av_packet_unref(pkt);
3281 st->codec_info_nb_frames++;
3286 AVPacket empty_pkt = { 0 };
3288 av_init_packet(&empty_pkt);
3290 for (i = 0; i < ic->nb_streams; i++) {
3292 st = ic->streams[i];
3294 /* flush the decoders */
3295 if (st->info->found_decoder == 1) {
3297 err = try_decode_frame(ic, st, &empty_pkt,
3298 (options && i < orig_nb_streams)
3299 ? &options[i] : NULL);
3300 } while (err > 0 && !has_codec_parameters(st, NULL));
3303 av_log(ic, AV_LOG_INFO,
3304 "decoding for stream %d failed\n", st->index);
3310 // close codecs which were opened in try_decode_frame()
3311 for (i = 0; i < ic->nb_streams; i++) {
3312 st = ic->streams[i];
3313 avcodec_close(st->codec);
3316 ff_rfps_calculate(ic);
3318 for (i = 0; i < ic->nb_streams; i++) {
3319 st = ic->streams[i];
3320 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
3321 if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && !st->codec->codec_tag && !st->codec->bits_per_coded_sample) {
3322 uint32_t tag= avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
3323 if (avpriv_find_pix_fmt(avpriv_get_raw_pix_fmt_tags(), tag) == st->codec->pix_fmt)
3324 st->codec->codec_tag= tag;
3327 /* estimate average framerate if not set by demuxer */
3328 if (st->info->codec_info_duration_fields &&
3329 !st->avg_frame_rate.num &&
3330 st->info->codec_info_duration) {
3332 double best_error = 0.01;
3334 if (st->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
3335 st->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
3336 st->info->codec_info_duration < 0)
3338 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
3339 st->info->codec_info_duration_fields * (int64_t) st->time_base.den,
3340 st->info->codec_info_duration * 2 * (int64_t) st->time_base.num, 60000);
3342 /* Round guessed framerate to a "standard" framerate if it's
3343 * within 1% of the original estimate. */
3344 for (j = 0; j < MAX_STD_TIMEBASES; j++) {
3345 AVRational std_fps = { get_std_framerate(j), 12 * 1001 };
3346 double error = fabs(av_q2d(st->avg_frame_rate) /
3347 av_q2d(std_fps) - 1);
3349 if (error < best_error) {
3351 best_fps = std_fps.num;
3355 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
3356 best_fps, 12 * 1001, INT_MAX);
3359 if (!st->r_frame_rate.num) {
3360 if ( st->codec->time_base.den * (int64_t) st->time_base.num
3361 <= st->codec->time_base.num * st->codec->ticks_per_frame * (int64_t) st->time_base.den) {
3362 st->r_frame_rate.num = st->codec->time_base.den;
3363 st->r_frame_rate.den = st->codec->time_base.num * st->codec->ticks_per_frame;
3365 st->r_frame_rate.num = st->time_base.den;
3366 st->r_frame_rate.den = st->time_base.num;
3369 if (st->display_aspect_ratio.num && st->display_aspect_ratio.den) {
3370 AVRational hw_ratio = { st->codec->height, st->codec->width };
3371 st->sample_aspect_ratio = av_mul_q(st->display_aspect_ratio,
3374 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
3375 if (!st->codec->bits_per_coded_sample)
3376 st->codec->bits_per_coded_sample =
3377 av_get_bits_per_sample(st->codec->codec_id);
3378 // set stream disposition based on audio service type
3379 switch (st->codec->audio_service_type) {
3380 case AV_AUDIO_SERVICE_TYPE_EFFECTS:
3381 st->disposition = AV_DISPOSITION_CLEAN_EFFECTS;
3383 case AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED:
3384 st->disposition = AV_DISPOSITION_VISUAL_IMPAIRED;
3386 case AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED:
3387 st->disposition = AV_DISPOSITION_HEARING_IMPAIRED;
3389 case AV_AUDIO_SERVICE_TYPE_COMMENTARY:
3390 st->disposition = AV_DISPOSITION_COMMENT;
3392 case AV_AUDIO_SERVICE_TYPE_KARAOKE:
3393 st->disposition = AV_DISPOSITION_KARAOKE;
3400 estimate_timings(ic, old_offset);
3402 av_opt_set(ic, "skip_clear", "0", AV_OPT_SEARCH_CHILDREN);
3404 if (ret >= 0 && ic->nb_streams)
3405 /* We could not have all the codec parameters before EOF. */
3407 for (i = 0; i < ic->nb_streams; i++) {
3409 st = ic->streams[i];
3410 if (!has_codec_parameters(st, &errmsg)) {
3412 avcodec_string(buf, sizeof(buf), st->codec, 0);
3413 av_log(ic, AV_LOG_WARNING,
3414 "Could not find codec parameters for stream %d (%s): %s\n"
3415 "Consider increasing the value for the 'analyzeduration' and 'probesize' options\n",
3422 compute_chapters_end(ic);
3424 find_stream_info_err:
3425 for (i = 0; i < ic->nb_streams; i++) {
3426 st = ic->streams[i];
3427 if (ic->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
3428 ic->streams[i]->codec->thread_count = 0;
3430 av_freep(&st->info->duration_error);
3431 av_freep(&ic->streams[i]->info);
3434 av_log(ic, AV_LOG_DEBUG, "After avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d frames:%d\n",
3435 avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, count);
3439 AVProgram *av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
3443 for (i = 0; i < ic->nb_programs; i++) {
3444 if (ic->programs[i] == last) {
3448 for (j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
3449 if (ic->programs[i]->stream_index[j] == s)
3450 return ic->programs[i];
3456 int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type,
3457 int wanted_stream_nb, int related_stream,
3458 AVCodec **decoder_ret, int flags)
3460 int i, nb_streams = ic->nb_streams;
3461 int ret = AVERROR_STREAM_NOT_FOUND, best_count = -1, best_bitrate = -1, best_multiframe = -1, count, bitrate, multiframe;
3462 unsigned *program = NULL;
3463 const AVCodec *decoder = NULL, *best_decoder = NULL;
3465 if (related_stream >= 0 && wanted_stream_nb < 0) {
3466 AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
3468 program = p->stream_index;
3469 nb_streams = p->nb_stream_indexes;
3472 for (i = 0; i < nb_streams; i++) {
3473 int real_stream_index = program ? program[i] : i;
3474 AVStream *st = ic->streams[real_stream_index];
3475 AVCodecContext *avctx = st->codec;
3476 if (avctx->codec_type != type)
3478 if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
3480 if (wanted_stream_nb != real_stream_index &&
3481 st->disposition & (AV_DISPOSITION_HEARING_IMPAIRED |
3482 AV_DISPOSITION_VISUAL_IMPAIRED))
3484 if (type == AVMEDIA_TYPE_AUDIO && !avctx->channels)
3487 decoder = find_decoder(ic, st, st->codec->codec_id);
3490 ret = AVERROR_DECODER_NOT_FOUND;
3494 count = st->codec_info_nb_frames;
3495 bitrate = avctx->bit_rate;
3497 bitrate = avctx->rc_max_rate;
3498 multiframe = FFMIN(5, count);
3499 if ((best_multiframe > multiframe) ||
3500 (best_multiframe == multiframe && best_bitrate > bitrate) ||