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FFmpeg/libavformat/demux.c
Andreas Rheinhardt 97e26937b4 avformat/demux: Remove redundant prevention against infinite loop 
This piece of code has been added as FFmpeg's answer to
infinite loops in try_decode_frame() in commit
6072a19b4f. There is no loop
around try_decode_frame() any more, so this code can be removed.

This code is only triggered in case a) the codec parameter could
not be determined, b) the decode delay could not be guessed or
c) no packet was ever encountered and the encoder has the
AV_CODEC_CAP_CHANNEL_CONF. In these cases the new code will
no longer emit a "decoding for stream %d failed" message, which is
prima facie false. In case a) an additional "Could not find codec
parameters" message is (and will be) emitted. No warning will be
emitted any more in case b) (this happens e.g. with some
h264-conformance FATE-files).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-12-16 02:37:26 +01:00

2956 lines
112 KiB
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/*
* Core demuxing component
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "config.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixfmt.h"
#include "libavutil/time.h"
#include "libavutil/timestamp.h"
#include "libavcodec/bsf.h"
#include "libavcodec/internal.h"
#include "libavcodec/packet_internal.h"
#include "libavcodec/raw.h"
#include "avformat.h"
#include "avio_internal.h"
#include "id3v2.h"
#include "internal.h"
#include "url.h"
static int64_t wrap_timestamp(const AVStream *st, int64_t timestamp)
{
const FFStream *const sti = cffstream(st);
if (sti->pts_wrap_behavior != AV_PTS_WRAP_IGNORE && st->pts_wrap_bits < 64 &&
sti->pts_wrap_reference != AV_NOPTS_VALUE && timestamp != AV_NOPTS_VALUE) {
if (sti->pts_wrap_behavior == AV_PTS_WRAP_ADD_OFFSET &&
timestamp < sti->pts_wrap_reference)
return timestamp + (1ULL << st->pts_wrap_bits);
else if (sti->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET &&
timestamp >= sti->pts_wrap_reference)
return timestamp - (1ULL << st->pts_wrap_bits);
}
return timestamp;
}
int64_t ff_wrap_timestamp(const AVStream *st, int64_t timestamp)
{
return wrap_timestamp(st, timestamp);
}
static const AVCodec *find_probe_decoder(AVFormatContext *s, const AVStream *st, enum AVCodecID codec_id)
{
const AVCodec *codec;
#if CONFIG_H264_DECODER
/* Other parts of the code assume this decoder to be used for h264,
* so force it if possible. */
if (codec_id == AV_CODEC_ID_H264)
return avcodec_find_decoder_by_name("h264");
#endif
codec = ff_find_decoder(s, st, codec_id);
if (!codec)
return NULL;
if (codec->capabilities & AV_CODEC_CAP_AVOID_PROBING) {
const AVCodec *probe_codec = NULL;
void *iter = NULL;
while ((probe_codec = av_codec_iterate(&iter))) {
if (probe_codec->id == codec->id &&
av_codec_is_decoder(probe_codec) &&
!(probe_codec->capabilities & (AV_CODEC_CAP_AVOID_PROBING | AV_CODEC_CAP_EXPERIMENTAL))) {
return probe_codec;
}
}
}
return codec;
}
static int set_codec_from_probe_data(AVFormatContext *s, AVStream *st,
AVProbeData *pd)
{
static const struct {
const char *name;
enum AVCodecID id;
enum AVMediaType type;
} fmt_id_type[] = {
{ "aac", AV_CODEC_ID_AAC, AVMEDIA_TYPE_AUDIO },
{ "ac3", AV_CODEC_ID_AC3, AVMEDIA_TYPE_AUDIO },
{ "aptx", AV_CODEC_ID_APTX, AVMEDIA_TYPE_AUDIO },
{ "dts", AV_CODEC_ID_DTS, AVMEDIA_TYPE_AUDIO },
{ "dvbsub", AV_CODEC_ID_DVB_SUBTITLE, AVMEDIA_TYPE_SUBTITLE },
{ "dvbtxt", AV_CODEC_ID_DVB_TELETEXT, AVMEDIA_TYPE_SUBTITLE },
{ "eac3", AV_CODEC_ID_EAC3, AVMEDIA_TYPE_AUDIO },
{ "h264", AV_CODEC_ID_H264, AVMEDIA_TYPE_VIDEO },
{ "hevc", AV_CODEC_ID_HEVC, AVMEDIA_TYPE_VIDEO },
{ "loas", AV_CODEC_ID_AAC_LATM, AVMEDIA_TYPE_AUDIO },
{ "m4v", AV_CODEC_ID_MPEG4, AVMEDIA_TYPE_VIDEO },
{ "mjpeg_2000", AV_CODEC_ID_JPEG2000, AVMEDIA_TYPE_VIDEO },
{ "mp3", AV_CODEC_ID_MP3, AVMEDIA_TYPE_AUDIO },
{ "mpegvideo", AV_CODEC_ID_MPEG2VIDEO, AVMEDIA_TYPE_VIDEO },
{ "truehd", AV_CODEC_ID_TRUEHD, AVMEDIA_TYPE_AUDIO },
{ 0 }
};
int score;
const AVInputFormat *fmt = av_probe_input_format3(pd, 1, &score);
FFStream *const sti = ffstream(st);
if (fmt) {
av_log(s, AV_LOG_DEBUG,
"Probe with size=%d, packets=%d detected %s with score=%d\n",
pd->buf_size, s->max_probe_packets - sti->probe_packets,
fmt->name, score);
for (int i = 0; fmt_id_type[i].name; i++) {
if (!strcmp(fmt->name, fmt_id_type[i].name)) {
if (fmt_id_type[i].type != AVMEDIA_TYPE_AUDIO &&
st->codecpar->sample_rate)
continue;
if (sti->request_probe > score &&
st->codecpar->codec_id != fmt_id_type[i].id)
continue;
st->codecpar->codec_id = fmt_id_type[i].id;
st->codecpar->codec_type = fmt_id_type[i].type;
sti->need_context_update = 1;
return score;
}
}
}
return 0;
}
static int init_input(AVFormatContext *s, const char *filename,
AVDictionary **options)
{
int ret;
AVProbeData pd = { filename, NULL, 0 };
int score = AVPROBE_SCORE_RETRY;
if (s->pb) {
s->flags |= AVFMT_FLAG_CUSTOM_IO;
if (!s->iformat)
return av_probe_input_buffer2(s->pb, &s->iformat, filename,
s, 0, s->format_probesize);
else if (s->iformat->flags & AVFMT_NOFILE)
av_log(s, AV_LOG_WARNING, "Custom AVIOContext makes no sense and "
"will be ignored with AVFMT_NOFILE format.\n");
return 0;
}
if ((s->iformat && s->iformat->flags & AVFMT_NOFILE) ||
(!s->iformat && (s->iformat = av_probe_input_format2(&pd, 0, &score))))
return score;
if ((ret = s->io_open(s, &s->pb, filename, AVIO_FLAG_READ | s->avio_flags, options)) < 0)
return ret;
if (s->iformat)
return 0;
return av_probe_input_buffer2(s->pb, &s->iformat, filename,
s, 0, s->format_probesize);
}
static int update_stream_avctx(AVFormatContext *s)
{
int ret;
for (unsigned i = 0; i < s->nb_streams; i++) {
AVStream *const st = s->streams[i];
FFStream *const sti = ffstream(st);
if (!sti->need_context_update)
continue;
/* close parser, because it depends on the codec */
if (sti->parser && sti->avctx->codec_id != st->codecpar->codec_id) {
av_parser_close(sti->parser);
sti->parser = NULL;
}
/* update internal codec context, for the parser */
ret = avcodec_parameters_to_context(sti->avctx, st->codecpar);
if (ret < 0)
return ret;
sti->need_context_update = 0;
}
return 0;
}
int avformat_open_input(AVFormatContext **ps, const char *filename,
const AVInputFormat *fmt, AVDictionary **options)
{
AVFormatContext *s = *ps;
FFFormatContext *si;
AVDictionary *tmp = NULL;
ID3v2ExtraMeta *id3v2_extra_meta = NULL;
int ret = 0;
if (!s && !(s = avformat_alloc_context()))
return AVERROR(ENOMEM);
si = ffformatcontext(s);
if (!s->av_class) {
av_log(NULL, AV_LOG_ERROR, "Input context has not been properly allocated by avformat_alloc_context() and is not NULL either\n");
return AVERROR(EINVAL);
}
if (fmt)
s->iformat = fmt;
if (options)
av_dict_copy(&tmp, *options, 0);
if (s->pb) // must be before any goto fail
s->flags |= AVFMT_FLAG_CUSTOM_IO;
if ((ret = av_opt_set_dict(s, &tmp)) < 0)
goto fail;
if (!(s->url = av_strdup(filename ? filename : ""))) {
ret = AVERROR(ENOMEM);
goto fail;
}
if ((ret = init_input(s, filename, &tmp)) < 0)
goto fail;
s->probe_score = ret;
if (!s->protocol_whitelist && s->pb && s->pb->protocol_whitelist) {
s->protocol_whitelist = av_strdup(s->pb->protocol_whitelist);
if (!s->protocol_whitelist) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
if (!s->protocol_blacklist && s->pb && s->pb->protocol_blacklist) {
s->protocol_blacklist = av_strdup(s->pb->protocol_blacklist);
if (!s->protocol_blacklist) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
if (s->format_whitelist && av_match_list(s->iformat->name, s->format_whitelist, ',') <= 0) {
av_log(s, AV_LOG_ERROR, "Format not on whitelist \'%s\'\n", s->format_whitelist);
ret = AVERROR(EINVAL);
goto fail;
}
avio_skip(s->pb, s->skip_initial_bytes);
/* Check filename in case an image number is expected. */
if (s->iformat->flags & AVFMT_NEEDNUMBER) {
if (!av_filename_number_test(filename)) {
ret = AVERROR(EINVAL);
goto fail;
}
}
s->duration = s->start_time = AV_NOPTS_VALUE;
/* Allocate private data. */
if (s->iformat->priv_data_size > 0) {
if (!(s->priv_data = av_mallocz(s->iformat->priv_data_size))) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (s->iformat->priv_class) {
*(const AVClass **) s->priv_data = s->iformat->priv_class;
av_opt_set_defaults(s->priv_data);
if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
goto fail;
}
}
/* e.g. AVFMT_NOFILE formats will not have an AVIOContext */
if (s->pb)
ff_id3v2_read_dict(s->pb, &si->id3v2_meta, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
if (s->iformat->read_header)
if ((ret = s->iformat->read_header(s)) < 0) {
if (s->iformat->flags_internal & FF_FMT_INIT_CLEANUP)
goto close;
goto fail;
}
if (!s->metadata) {
s->metadata = si->id3v2_meta;
si->id3v2_meta = NULL;
} else if (si->id3v2_meta) {
av_log(s, AV_LOG_WARNING, "Discarding ID3 tags because more suitable tags were found.\n");
av_dict_free(&si->id3v2_meta);
}
if (id3v2_extra_meta) {
if (!strcmp(s->iformat->name, "mp3") || !strcmp(s->iformat->name, "aac") ||
!strcmp(s->iformat->name, "tta") || !strcmp(s->iformat->name, "wav")) {
if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0)
goto close;
if ((ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0)
goto close;
if ((ret = ff_id3v2_parse_priv(s, id3v2_extra_meta)) < 0)
goto close;
} else
av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
}
if ((ret = avformat_queue_attached_pictures(s)) < 0)
goto close;
if (s->pb && !si->data_offset)
si->data_offset = avio_tell(s->pb);
si->raw_packet_buffer_size = 0;
update_stream_avctx(s);
if (options) {
av_dict_free(options);
*options = tmp;
}
*ps = s;
return 0;
close:
if (s->iformat->read_close)
s->iformat->read_close(s);
fail:
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
av_dict_free(&tmp);
if (s->pb && !(s->flags & AVFMT_FLAG_CUSTOM_IO))
avio_closep(&s->pb);
avformat_free_context(s);
*ps = NULL;
return ret;
}
void avformat_close_input(AVFormatContext **ps)
{
AVFormatContext *s;
AVIOContext *pb;
if (!ps || !*ps)
return;
s = *ps;
pb = s->pb;
if ((s->iformat && strcmp(s->iformat->name, "image2") && s->iformat->flags & AVFMT_NOFILE) ||
(s->flags & AVFMT_FLAG_CUSTOM_IO))
pb = NULL;
if (s->iformat)
if (s->iformat->read_close)
s->iformat->read_close(s);
avformat_free_context(s);
*ps = NULL;
avio_close(pb);
}
static void force_codec_ids(AVFormatContext *s, AVStream *st)
{
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (s->video_codec_id)
st->codecpar->codec_id = s->video_codec_id;
break;
case AVMEDIA_TYPE_AUDIO:
if (s->audio_codec_id)
st->codecpar->codec_id = s->audio_codec_id;
break;
case AVMEDIA_TYPE_SUBTITLE:
if (s->subtitle_codec_id)
st->codecpar->codec_id = s->subtitle_codec_id;
break;
case AVMEDIA_TYPE_DATA:
if (s->data_codec_id)
st->codecpar->codec_id = s->data_codec_id;
break;
}
}
static int probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
{
FFFormatContext *const si = ffformatcontext(s);
FFStream *const sti = ffstream(st);
if (sti->request_probe > 0) {
AVProbeData *const pd = &sti->probe_data;
int end;
av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, sti->probe_packets);
--sti->probe_packets;
if (pkt) {
uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
if (!new_buf) {
av_log(s, AV_LOG_WARNING,
"Failed to reallocate probe buffer for stream %d\n",
st->index);
goto no_packet;
}
pd->buf = new_buf;
memcpy(pd->buf + pd->buf_size, pkt->data, pkt->size);
pd->buf_size += pkt->size;
memset(pd->buf + pd->buf_size, 0, AVPROBE_PADDING_SIZE);
} else {
no_packet:
sti->probe_packets = 0;
if (!pd->buf_size) {
av_log(s, AV_LOG_WARNING,
"nothing to probe for stream %d\n", st->index);
}
}
end = si->raw_packet_buffer_size >= s->probesize
|| sti->probe_packets <= 0;
if (end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)) {
int score = set_codec_from_probe_data(s, st, pd);
if ( (st->codecpar->codec_id != AV_CODEC_ID_NONE && score > AVPROBE_SCORE_STREAM_RETRY)
|| end) {
pd->buf_size = 0;
av_freep(&pd->buf);
sti->request_probe = -1;
if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
} else
av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
}
force_codec_ids(s, st);
}
}
return 0;
}
static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
{
FFStream *const sti = ffstream(st);
int64_t ref = pkt->dts;
int pts_wrap_behavior;
int64_t pts_wrap_reference;
AVProgram *first_program;
if (ref == AV_NOPTS_VALUE)
ref = pkt->pts;
if (sti->pts_wrap_reference != AV_NOPTS_VALUE || st->pts_wrap_bits >= 63 || ref == AV_NOPTS_VALUE || !s->correct_ts_overflow)
return 0;
ref &= (1LL << st->pts_wrap_bits)-1;
// reference time stamp should be 60 s before first time stamp
pts_wrap_reference = ref - av_rescale(60, st->time_base.den, st->time_base.num);
// if first time stamp is not more than 1/8 and 60s before the wrap point, subtract rather than add wrap offset
pts_wrap_behavior = (ref < (1LL << st->pts_wrap_bits) - (1LL << st->pts_wrap_bits-3)) ||
(ref < (1LL << st->pts_wrap_bits) - av_rescale(60, st->time_base.den, st->time_base.num)) ?
AV_PTS_WRAP_ADD_OFFSET : AV_PTS_WRAP_SUB_OFFSET;
first_program = av_find_program_from_stream(s, NULL, stream_index);
if (!first_program) {
int default_stream_index = av_find_default_stream_index(s);
FFStream *const default_sti = ffstream(s->streams[default_stream_index]);
if (default_sti->pts_wrap_reference == AV_NOPTS_VALUE) {
for (unsigned i = 0; i < s->nb_streams; i++) {
FFStream *const sti = ffstream(s->streams[i]);
if (av_find_program_from_stream(s, NULL, i))
continue;
sti->pts_wrap_reference = pts_wrap_reference;
sti->pts_wrap_behavior = pts_wrap_behavior;
}
} else {
sti->pts_wrap_reference = default_sti->pts_wrap_reference;
sti->pts_wrap_behavior = default_sti->pts_wrap_behavior;
}
} else {
AVProgram *program = first_program;
while (program) {
if (program->pts_wrap_reference != AV_NOPTS_VALUE) {
pts_wrap_reference = program->pts_wrap_reference;
pts_wrap_behavior = program->pts_wrap_behavior;
break;
}
program = av_find_program_from_stream(s, program, stream_index);
}
// update every program with differing pts_wrap_reference
program = first_program;
while (program) {
if (program->pts_wrap_reference != pts_wrap_reference) {
for (unsigned i = 0; i < program->nb_stream_indexes; i++) {
FFStream *const sti = ffstream(s->streams[program->stream_index[i]]);
sti->pts_wrap_reference = pts_wrap_reference;
sti->pts_wrap_behavior = pts_wrap_behavior;
}
program->pts_wrap_reference = pts_wrap_reference;
program->pts_wrap_behavior = pts_wrap_behavior;
}
program = av_find_program_from_stream(s, program, stream_index);
}
}
return 1;
}
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
{
FFFormatContext *const si = ffformatcontext(s);
int err;
#if FF_API_INIT_PACKET
FF_DISABLE_DEPRECATION_WARNINGS
pkt->data = NULL;
pkt->size = 0;
av_init_packet(pkt);
FF_ENABLE_DEPRECATION_WARNINGS
#else
av_packet_unref(pkt);
#endif
for (;;) {
PacketList *pktl = si->raw_packet_buffer;
AVStream *st;
FFStream *sti;
const AVPacket *pkt1;
if (pktl) {
AVStream *const st = s->streams[pktl->pkt.stream_index];
if (si->raw_packet_buffer_size >= s->probesize)
if ((err = probe_codec(s, st, NULL)) < 0)
return err;
if (ffstream(st)->request_probe <= 0) {
avpriv_packet_list_get(&si->raw_packet_buffer,
&si->raw_packet_buffer_end, pkt);
si->raw_packet_buffer_size -= pkt->size;
return 0;
}
}
err = s->iformat->read_packet(s, pkt);
if (err < 0) {
av_packet_unref(pkt);
/* Some demuxers return FFERROR_REDO when they consume
data and discard it (ignored streams, junk, extradata).
We must re-call the demuxer to get the real packet. */
if (err == FFERROR_REDO)
continue;
if (!pktl || err == AVERROR(EAGAIN))
return err;
for (unsigned i = 0; i < s->nb_streams; i++) {
AVStream *const st = s->streams[i];
FFStream *const sti = ffstream(st);
if (sti->probe_packets || sti->request_probe > 0)
if ((err = probe_codec(s, st, NULL)) < 0)
return err;
av_assert0(sti->request_probe <= 0);
}
continue;
}
err = av_packet_make_refcounted(pkt);
if (err < 0) {
av_packet_unref(pkt);
return err;
}
if (pkt->flags & AV_PKT_FLAG_CORRUPT) {
av_log(s, AV_LOG_WARNING,
"Packet corrupt (stream = %d, dts = %s)",
pkt->stream_index, av_ts2str(pkt->dts));
if (s->flags & AVFMT_FLAG_DISCARD_CORRUPT) {
av_log(s, AV_LOG_WARNING, ", dropping it.\n");
av_packet_unref(pkt);
continue;
}
av_log(s, AV_LOG_WARNING, ".\n");
}
av_assert0(pkt->stream_index < (unsigned)s->nb_streams &&
"Invalid stream index.\n");
st = s->streams[pkt->stream_index];
sti = ffstream(st);
if (update_wrap_reference(s, st, pkt->stream_index, pkt) && sti->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET) {
// correct first time stamps to negative values
if (!is_relative(sti->first_dts))
sti->first_dts = wrap_timestamp(st, sti->first_dts);
if (!is_relative(st->start_time))
st->start_time = wrap_timestamp(st, st->start_time);
if (!is_relative(sti->cur_dts))
sti->cur_dts = wrap_timestamp(st, sti->cur_dts);
}
pkt->dts = wrap_timestamp(st, pkt->dts);
pkt->pts = wrap_timestamp(st, pkt->pts);
force_codec_ids(s, st);
/* TODO: audio: time filter; video: frame reordering (pts != dts) */
if (s->use_wallclock_as_timestamps)
pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
if (!pktl && sti->request_probe <= 0)
return 0;
err = avpriv_packet_list_put(&si->raw_packet_buffer,
&si->raw_packet_buffer_end,
pkt, NULL, 0);
if (err < 0) {
av_packet_unref(pkt);
return err;
}
pkt1 = &si->raw_packet_buffer_end->pkt;
si->raw_packet_buffer_size += pkt1->size;
if ((err = probe_codec(s, st, pkt1)) < 0)
return err;
}
}
/**
* Return the frame duration in seconds. Return 0 if not available.
*/
static void compute_frame_duration(AVFormatContext *s, int *pnum, int *pden,
AVStream *st, AVCodecParserContext *pc,
AVPacket *pkt)
{
FFStream *const sti = ffstream(st);
AVRational codec_framerate = sti->avctx->framerate;
int frame_size, sample_rate;
*pnum = 0;
*pden = 0;
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (st->r_frame_rate.num && (!pc || !codec_framerate.num)) {
*pnum = st->r_frame_rate.den;
*pden = st->r_frame_rate.num;
} else if (st->time_base.num * 1000LL > st->time_base.den) {
*pnum = st->time_base.num;
*pden = st->time_base.den;
} else if (codec_framerate.den * 1000LL > codec_framerate.num) {
av_assert0(sti->avctx->ticks_per_frame);
av_reduce(pnum, pden,
codec_framerate.den,
codec_framerate.num * (int64_t)sti->avctx->ticks_per_frame,
INT_MAX);
if (pc && pc->repeat_pict) {
av_reduce(pnum, pden,
(*pnum) * (1LL + pc->repeat_pict),
(*pden),
INT_MAX);
}
/* If this codec can be interlaced or progressive then we need
* a parser to compute duration of a packet. Thus if we have
* no parser in such case leave duration undefined. */
if (sti->avctx->ticks_per_frame > 1 && !pc)
*pnum = *pden = 0;
}
break;
case AVMEDIA_TYPE_AUDIO:
if (sti->avctx_inited) {
frame_size = av_get_audio_frame_duration(sti->avctx, pkt->size);
sample_rate = sti->avctx->sample_rate;
} else {
frame_size = av_get_audio_frame_duration2(st->codecpar, pkt->size);
sample_rate = st->codecpar->sample_rate;
}
if (frame_size <= 0 || sample_rate <= 0)
break;
*pnum = frame_size;
*pden = sample_rate;
break;
default:
break;
}
}
static int has_decode_delay_been_guessed(AVStream *st)
{
FFStream *const sti = ffstream(st);
if (st->codecpar->codec_id != AV_CODEC_ID_H264) return 1;
if (!sti->info) // if we have left find_stream_info then nb_decoded_frames won't increase anymore for stream copy
return 1;
#if CONFIG_H264_DECODER
if (sti->avctx->has_b_frames &&
avpriv_h264_has_num_reorder_frames(sti->avctx) == sti->avctx->has_b_frames)
return 1;
#endif
if (sti->avctx->has_b_frames < 3)
return sti->nb_decoded_frames >= 7;
else if (sti->avctx->has_b_frames < 4)
return sti->nb_decoded_frames >= 18;
else
return sti->nb_decoded_frames >= 20;
}
static PacketList *get_next_pkt(AVFormatContext *s, AVStream *st, PacketList *pktl)
{
FFFormatContext *const si = ffformatcontext(s);
if (pktl->next)
return pktl->next;
if (pktl == si->packet_buffer_end)
return si->parse_queue;
return NULL;
}
static int64_t select_from_pts_buffer(AVStream *st, int64_t *pts_buffer, int64_t dts)
{
FFStream *const sti = ffstream(st);
int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
st->codecpar->codec_id != AV_CODEC_ID_HEVC;
if (!onein_oneout) {
int delay = sti->avctx->has_b_frames;
if (dts == AV_NOPTS_VALUE) {
int64_t best_score = INT64_MAX;
for (int i = 0; i < delay; i++) {
if (sti->pts_reorder_error_count[i]) {
int64_t score = sti->pts_reorder_error[i] / sti->pts_reorder_error_count[i];
if (score < best_score) {
best_score = score;
dts = pts_buffer[i];
}
}
}
} else {
for (int i = 0; i < delay; i++) {
if (pts_buffer[i] != AV_NOPTS_VALUE) {
int64_t diff = FFABS(pts_buffer[i] - dts)
+ (uint64_t)sti->pts_reorder_error[i];
diff = FFMAX(diff, sti->pts_reorder_error[i]);
sti->pts_reorder_error[i] = diff;
sti->pts_reorder_error_count[i]++;
if (sti->pts_reorder_error_count[i] > 250) {
sti->pts_reorder_error[i] >>= 1;
sti->pts_reorder_error_count[i] >>= 1;
}
}
}
}
}
if (dts == AV_NOPTS_VALUE)
dts = pts_buffer[0];
return dts;
}
/**
* Updates the dts of packets of a stream in pkt_buffer, by re-ordering the pts
* of the packets in a window.
*/
static void update_dts_from_pts(AVFormatContext *s, int stream_index,
PacketList *pkt_buffer)
{
AVStream *const st = s->streams[stream_index];
int delay = ffstream(st)->avctx->has_b_frames;
int64_t pts_buffer[MAX_REORDER_DELAY+1];
for (int i = 0; i < MAX_REORDER_DELAY + 1; i++)
pts_buffer[i] = AV_NOPTS_VALUE;
for (; pkt_buffer; pkt_buffer = get_next_pkt(s, st, pkt_buffer)) {
if (pkt_buffer->pkt.stream_index != stream_index)
continue;
if (pkt_buffer->pkt.pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
pts_buffer[0] = pkt_buffer->pkt.pts;
for (int i = 0; i < delay && pts_buffer[i] > pts_buffer[i + 1]; i++)
FFSWAP(int64_t, pts_buffer[i], pts_buffer[i + 1]);
pkt_buffer->pkt.dts = select_from_pts_buffer(st, pts_buffer, pkt_buffer->pkt.dts);
}
}
}
static void update_initial_timestamps(AVFormatContext *s, int stream_index,
int64_t dts, int64_t pts, AVPacket *pkt)
{
FFFormatContext *const si = ffformatcontext(s);
AVStream *const st = s->streams[stream_index];
FFStream *const sti = ffstream(st);
PacketList *pktl = si->packet_buffer ? si->packet_buffer : si->parse_queue;
uint64_t shift;
if (sti->first_dts != AV_NOPTS_VALUE ||
dts == AV_NOPTS_VALUE ||
sti->cur_dts == AV_NOPTS_VALUE ||
sti->cur_dts < INT_MIN + RELATIVE_TS_BASE ||
dts < INT_MIN + (sti->cur_dts - RELATIVE_TS_BASE) ||
is_relative(dts))
return;
sti->first_dts = dts - (sti->cur_dts - RELATIVE_TS_BASE);
sti->cur_dts = dts;
shift = (uint64_t)sti->first_dts - RELATIVE_TS_BASE;
if (is_relative(pts))
pts += shift;
for (PacketList *pktl_it = pktl; pktl_it; pktl_it = get_next_pkt(s, st, pktl_it)) {
if (pktl_it->pkt.stream_index != stream_index)
continue;
if (is_relative(pktl_it->pkt.pts))
pktl_it->pkt.pts += shift;
if (is_relative(pktl_it->pkt.dts))
pktl_it->pkt.dts += shift;
if (st->start_time == AV_NOPTS_VALUE && pktl_it->pkt.pts != AV_NOPTS_VALUE) {
st->start_time = pktl_it->pkt.pts;
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->codecpar->sample_rate)
st->start_time = av_sat_add64(st->start_time, av_rescale_q(sti->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base));
}
}
if (has_decode_delay_been_guessed(st))
update_dts_from_pts(s, stream_index, pktl);
if (st->start_time == AV_NOPTS_VALUE) {
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || !(pkt->flags & AV_PKT_FLAG_DISCARD)) {
st->start_time = pts;
}
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->codecpar->sample_rate)
st->start_time = av_sat_add64(st->start_time, av_rescale_q(sti->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base));
}
}
static void update_initial_durations(AVFormatContext *s, AVStream *st,
int stream_index, int64_t duration)
{
FFFormatContext *const si = ffformatcontext(s);
FFStream *const sti = ffstream(st);
PacketList *pktl = si->packet_buffer ? si->packet_buffer : si->parse_queue;
int64_t cur_dts = RELATIVE_TS_BASE;
if (sti->first_dts != AV_NOPTS_VALUE) {
if (sti->update_initial_durations_done)
return;
sti->update_initial_durations_done = 1;
cur_dts = sti->first_dts;
for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
if (pktl->pkt.stream_index == stream_index) {
if (pktl->pkt.pts != pktl->pkt.dts ||
pktl->pkt.dts != AV_NOPTS_VALUE ||
pktl->pkt.duration)
break;
cur_dts -= duration;
}
}
if (pktl && pktl->pkt.dts != sti->first_dts) {
av_log(s, AV_LOG_DEBUG, "first_dts %s not matching first dts %s (pts %s, duration %"PRId64") in the queue\n",
av_ts2str(sti->first_dts), av_ts2str(pktl->pkt.dts), av_ts2str(pktl->pkt.pts), pktl->pkt.duration);
return;
}
if (!pktl) {
av_log(s, AV_LOG_DEBUG, "first_dts %s but no packet with dts in the queue\n", av_ts2str(sti->first_dts));
return;
}
pktl = si->packet_buffer ? si->packet_buffer : si->parse_queue;
sti->first_dts = cur_dts;
} else if (sti->cur_dts != RELATIVE_TS_BASE)
return;
for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
if (pktl->pkt.stream_index != stream_index)
continue;
if ((pktl->pkt.pts == pktl->pkt.dts ||
pktl->pkt.pts == AV_NOPTS_VALUE) &&
(pktl->pkt.dts == AV_NOPTS_VALUE ||
pktl->pkt.dts == sti->first_dts ||
pktl->pkt.dts == RELATIVE_TS_BASE) &&
!pktl->pkt.duration &&
av_sat_add64(cur_dts, duration) == cur_dts + (uint64_t)duration
) {
pktl->pkt.dts = cur_dts;
if (!sti->avctx->has_b_frames)
pktl->pkt.pts = cur_dts;
pktl->pkt.duration = duration;
} else
break;
cur_dts = pktl->pkt.dts + pktl->pkt.duration;
}
if (!pktl)
sti->cur_dts = cur_dts;
}
static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
AVCodecParserContext *pc, AVPacket *pkt,
int64_t next_dts, int64_t next_pts)
{
FFFormatContext *const si = ffformatcontext(s);
FFStream *const sti = ffstream(st);
int num, den, presentation_delayed, delay;
int64_t offset;
AVRational duration;
int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
st->codecpar->codec_id != AV_CODEC_ID_HEVC;
if (s->flags & AVFMT_FLAG_NOFILLIN)
return;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && pkt->dts != AV_NOPTS_VALUE) {
if (pkt->dts == pkt->pts && sti->last_dts_for_order_check != AV_NOPTS_VALUE) {
if (sti->last_dts_for_order_check <= pkt->dts) {
sti->dts_ordered++;
} else {
av_log(s, sti->dts_misordered ? AV_LOG_DEBUG : AV_LOG_WARNING,
"DTS %"PRIi64" < %"PRIi64" out of order\n",
pkt->dts,
sti->last_dts_for_order_check);
sti->dts_misordered++;
}
if (sti->dts_ordered + sti->dts_misordered > 250) {
sti->dts_ordered >>= 1;
sti->dts_misordered >>= 1;
}
}
sti->last_dts_for_order_check = pkt->dts;
if (sti->dts_ordered < 8 * sti->dts_misordered && pkt->dts == pkt->pts)
pkt->dts = AV_NOPTS_VALUE;
}
if ((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
pkt->dts = AV_NOPTS_VALUE;
if (pc && pc->pict_type == AV_PICTURE_TYPE_B
&& !sti->avctx->has_b_frames)
//FIXME Set low_delay = 0 when has_b_frames = 1
sti->avctx->has_b_frames = 1;
/* do we have a video B-frame ? */
delay = sti->avctx->has_b_frames;
presentation_delayed = 0;
/* XXX: need has_b_frame, but cannot get it if the codec is
* not initialized */
if (delay &&
pc && pc->pict_type != AV_PICTURE_TYPE_B)
presentation_delayed = 1;
if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
st->pts_wrap_bits < 63 && pkt->dts > INT64_MIN + (1LL << st->pts_wrap_bits) &&
pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
if (is_relative(sti->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > sti->cur_dts) {
pkt->dts -= 1LL << st->pts_wrap_bits;
} else
pkt->pts += 1LL << st->pts_wrap_bits;
}
/* Some MPEG-2 in MPEG-PS lack dts (issue #171 / input_file.mpg).
* We take the conservative approach and discard both.
* Note: If this is misbehaving for an H.264 file, then possibly
* presentation_delayed is not set correctly. */
if (delay == 1 && pkt->dts == pkt->pts &&
pkt->dts != AV_NOPTS_VALUE && presentation_delayed) {
av_log(s, AV_LOG_DEBUG, "invalid dts/pts combination %"PRIi64"\n", pkt->dts);
if ( strcmp(s->iformat->name, "mov,mp4,m4a,3gp,3g2,mj2")
&& strcmp(s->iformat->name, "flv")) // otherwise we discard correct timestamps for vc1-wmapro.ism
pkt->dts = AV_NOPTS_VALUE;
}
duration = av_mul_q((AVRational) {pkt->duration, 1}, st->time_base);
if (pkt->duration <= 0) {
compute_frame_duration(s, &num, &den, st, pc, pkt);
if (den && num) {
duration = (AVRational) {num, den};
pkt->duration = av_rescale_rnd(1,
num * (int64_t) st->time_base.den,
den * (int64_t) st->time_base.num,
AV_ROUND_DOWN);
}
}
if (pkt->duration > 0 && (si->packet_buffer || si->parse_queue))
update_initial_durations(s, st, pkt->stream_index, pkt->duration);
/* Correct timestamps with byte offset if demuxers only have timestamps
* on packet boundaries */
if (pc && sti->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size) {
/* this will estimate bitrate based on this frame's duration and size */
offset = av_rescale(pc->offset, pkt->duration, pkt->size);
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts += offset;
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += offset;
}
/* This may be redundant, but it should not hurt. */
if (pkt->dts != AV_NOPTS_VALUE &&
pkt->pts != AV_NOPTS_VALUE &&
pkt->pts > pkt->dts)
presentation_delayed = 1;
if (s->debug & FF_FDEBUG_TS)
av_log(s, AV_LOG_DEBUG,
"IN delayed:%d pts:%s, dts:%s cur_dts:%s st:%d pc:%p duration:%"PRId64" delay:%d onein_oneout:%d\n",
presentation_delayed, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(sti->cur_dts),
pkt->stream_index, pc, pkt->duration, delay, onein_oneout);
/* Interpolate PTS and DTS if they are not present. We skip H264
* currently because delay and has_b_frames are not reliably set. */
if ((delay == 0 || (delay == 1 && pc)) &&
onein_oneout) {
if (presentation_delayed) {
/* DTS = decompression timestamp */
/* PTS = presentation timestamp */
if (pkt->dts == AV_NOPTS_VALUE)
pkt->dts = sti->last_IP_pts;
update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
if (pkt->dts == AV_NOPTS_VALUE)
pkt->dts = sti->cur_dts;
/* This is tricky: the dts must be incremented by the duration
* of the frame we are displaying, i.e. the last I- or P-frame. */
if (sti->last_IP_duration == 0 && (uint64_t)pkt->duration <= INT32_MAX)
sti->last_IP_duration = pkt->duration;
if (pkt->dts != AV_NOPTS_VALUE)
sti->cur_dts = av_sat_add64(pkt->dts, sti->last_IP_duration);
if (pkt->dts != AV_NOPTS_VALUE &&
pkt->pts == AV_NOPTS_VALUE &&
sti->last_IP_duration > 0 &&
((uint64_t)sti->cur_dts - (uint64_t)next_dts + 1) <= 2 &&
next_dts != next_pts &&
next_pts != AV_NOPTS_VALUE)
pkt->pts = next_dts;
if ((uint64_t)pkt->duration <= INT32_MAX)
sti->last_IP_duration = pkt->duration;
sti->last_IP_pts = pkt->pts;
/* Cannot compute PTS if not present (we can compute it only
* by knowing the future. */
} else if (pkt->pts != AV_NOPTS_VALUE ||
pkt->dts != AV_NOPTS_VALUE ||
pkt->duration > 0 ) {
/* presentation is not delayed : PTS and DTS are the same */
if (pkt->pts == AV_NOPTS_VALUE)
pkt->pts = pkt->dts;
update_initial_timestamps(s, pkt->stream_index, pkt->pts,
pkt->pts, pkt);
if (pkt->pts == AV_NOPTS_VALUE)
pkt->pts = sti->cur_dts;
pkt->dts = pkt->pts;
if (pkt->pts != AV_NOPTS_VALUE && duration.num >= 0)
sti->cur_dts = av_add_stable(st->time_base, pkt->pts, duration, 1);
}
}
if (pkt->pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
sti->pts_buffer[0] = pkt->pts;
for (int i = 0; i < delay && sti->pts_buffer[i] > sti->pts_buffer[i + 1]; i++)
FFSWAP(int64_t, sti->pts_buffer[i], sti->pts_buffer[i + 1]);
if (has_decode_delay_been_guessed(st))
pkt->dts = select_from_pts_buffer(st, sti->pts_buffer, pkt->dts);
}
// We skipped it above so we try here.
if (!onein_oneout)
// This should happen on the first packet
update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
if (pkt->dts > sti->cur_dts)
sti->cur_dts = pkt->dts;
if (s->debug & FF_FDEBUG_TS)
av_log(s, AV_LOG_DEBUG, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s st:%d (%d)\n",
presentation_delayed, delay, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(sti->cur_dts), st->index, st->id);
/* update flags */
if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA || ff_is_intra_only(st->codecpar->codec_id))
pkt->flags |= AV_PKT_FLAG_KEY;
}
/**
* Parse a packet, add all split parts to parse_queue.
*
* @param pkt Packet to parse; must not be NULL.
* @param flush Indicates whether to flush. If set, pkt must be blank.
*/
static int parse_packet(AVFormatContext *s, AVPacket *pkt,
int stream_index, int flush)
{
FFFormatContext *const si = ffformatcontext(s);
AVPacket *out_pkt = si->parse_pkt;
AVStream *st = s->streams[stream_index];
FFStream *const sti = ffstream(st);
const uint8_t *data = pkt->data;
int size = pkt->size;
int ret = 0, got_output = flush;
if (!size && !flush && sti->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
// preserve 0-size sync packets
compute_pkt_fields(s, st, sti->parser, pkt, AV_NOPTS_VALUE, AV_NOPTS_VALUE);
}
while (size > 0 || (flush && got_output)) {
int64_t next_pts = pkt->pts;
int64_t next_dts = pkt->dts;
int len;
len = av_parser_parse2(sti->parser, sti->avctx,
&out_pkt->data, &out_pkt->size, data, size,
pkt->pts, pkt->dts, pkt->pos);
pkt->pts = pkt->dts = AV_NOPTS_VALUE;
pkt->pos = -1;
/* increment read pointer */
av_assert1(data || !len);
data = len ? data + len : data;
size -= len;
got_output = !!out_pkt->size;
if (!out_pkt->size)
continue;
if (pkt->buf && out_pkt->data == pkt->data) {
/* reference pkt->buf only when out_pkt->data is guaranteed to point
* to data in it and not in the parser's internal buffer. */
/* XXX: Ensure this is the case with all parsers when sti->parser->flags
* is PARSER_FLAG_COMPLETE_FRAMES and check for that instead? */
out_pkt->buf = av_buffer_ref(pkt->buf);
if (!out_pkt->buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
} else {
ret = av_packet_make_refcounted(out_pkt);
if (ret < 0)
goto fail;
}
if (pkt->side_data) {
out_pkt->side_data = pkt->side_data;
out_pkt->side_data_elems = pkt->side_data_elems;
pkt->side_data = NULL;
pkt->side_data_elems = 0;
}
/* set the duration */
out_pkt->duration = (sti->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) ? pkt->duration : 0;
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
if (sti->avctx->sample_rate > 0) {
out_pkt->duration =
av_rescale_q_rnd(sti->parser->duration,
(AVRational) { 1, sti->avctx->sample_rate },
st->time_base,
AV_ROUND_DOWN);
}
}
out_pkt->stream_index = st->index;
out_pkt->pts = sti->parser->pts;
out_pkt->dts = sti->parser->dts;
out_pkt->pos = sti->parser->pos;
out_pkt->flags |= pkt->flags & (AV_PKT_FLAG_DISCARD | AV_PKT_FLAG_CORRUPT);
if (sti->need_parsing == AVSTREAM_PARSE_FULL_RAW)
out_pkt->pos = sti->parser->frame_offset;
if (sti->parser->key_frame == 1 ||
(sti->parser->key_frame == -1 &&
sti->parser->pict_type == AV_PICTURE_TYPE_I))
out_pkt->flags |= AV_PKT_FLAG_KEY;
if (sti->parser->key_frame == -1 && sti->parser->pict_type ==AV_PICTURE_TYPE_NONE && (pkt->flags&AV_PKT_FLAG_KEY))
out_pkt->flags |= AV_PKT_FLAG_KEY;
compute_pkt_fields(s, st, sti->parser, out_pkt, next_dts, next_pts);
ret = avpriv_packet_list_put(&si->parse_queue,
&si->parse_queue_end,
out_pkt, NULL, 0);
if (ret < 0)
goto fail;
}
/* end of the stream => close and free the parser */
if (flush) {
av_parser_close(sti->parser);
sti->parser = NULL;
}
fail:
if (ret < 0)
av_packet_unref(out_pkt);
av_packet_unref(pkt);
return ret;
}
static int64_t ts_to_samples(AVStream *st, int64_t ts)
{
return av_rescale(ts, st->time_base.num * st->codecpar->sample_rate, st->time_base.den);
}
static int read_frame_internal(AVFormatContext *s, AVPacket *pkt)
{
FFFormatContext *const si = ffformatcontext(s);
int ret, got_packet = 0;
AVDictionary *metadata = NULL;
while (!got_packet && !si->parse_queue) {
AVStream *st;
FFStream *sti;
/* read next packet */
ret = ff_read_packet(s, pkt);
if (ret < 0) {
if (ret == AVERROR(EAGAIN))
return ret;
/* flush the parsers */
for (unsigned i = 0; i < s->nb_streams; i++) {
AVStream *const st = s->streams[i];
FFStream *const sti = ffstream(st);
if (sti->parser && sti->need_parsing)
parse_packet(s, pkt, st->index, 1);
}
/* all remaining packets are now in parse_queue =>
* really terminate parsing */
break;
}
ret = 0;
st = s->streams[pkt->stream_index];
sti = ffstream(st);
st->event_flags |= AVSTREAM_EVENT_FLAG_NEW_PACKETS;
/* update context if required */
if (sti->need_context_update) {
if (avcodec_is_open(sti->avctx)) {
av_log(s, AV_LOG_DEBUG, "Demuxer context update while decoder is open, closing and trying to re-open\n");
avcodec_close(sti->avctx);
sti->info->found_decoder = 0;
}
/* close parser, because it depends on the codec */
if (sti->parser && sti->avctx->codec_id != st->codecpar->codec_id) {
av_parser_close(sti->parser);
sti->parser = NULL;
}
ret = avcodec_parameters_to_context(sti->avctx, st->codecpar);
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
sti->need_context_update = 0;
}
if (pkt->pts != AV_NOPTS_VALUE &&
pkt->dts != AV_NOPTS_VALUE &&
pkt->pts < pkt->dts) {
av_log(s, AV_LOG_WARNING,
"Invalid timestamps stream=%d, pts=%s, dts=%s, size=%d\n",
pkt->stream_index,
av_ts2str(pkt->pts),
av_ts2str(pkt->dts),
pkt->size);
}
if (s->debug & FF_FDEBUG_TS)
av_log(s, AV_LOG_DEBUG,
"ff_read_packet stream=%d, pts=%s, dts=%s, size=%d, duration=%"PRId64", flags=%d\n",
pkt->stream_index,
av_ts2str(pkt->pts),
av_ts2str(pkt->dts),
pkt->size, pkt->duration, pkt->flags);
if (sti->need_parsing && !sti->parser && !(s->flags & AVFMT_FLAG_NOPARSE)) {
sti->parser = av_parser_init(st->codecpar->codec_id);
if (!sti->parser) {
av_log(s, AV_LOG_VERBOSE, "parser not found for codec "
"%s, packets or times may be invalid.\n",
avcodec_get_name(st->codecpar->codec_id));
/* no parser available: just output the raw packets */
sti->need_parsing = AVSTREAM_PARSE_NONE;
} else if (sti->need_parsing == AVSTREAM_PARSE_HEADERS)
sti->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
else if (sti->need_parsing == AVSTREAM_PARSE_FULL_ONCE)
sti->parser->flags |= PARSER_FLAG_ONCE;
else if (sti->need_parsing == AVSTREAM_PARSE_FULL_RAW)
sti->parser->flags |= PARSER_FLAG_USE_CODEC_TS;
}
if (!sti->need_parsing || !sti->parser) {
/* no parsing needed: we just output the packet as is */
compute_pkt_fields(s, st, NULL, pkt, AV_NOPTS_VALUE, AV_NOPTS_VALUE);
if ((s->iformat->flags & AVFMT_GENERIC_INDEX) &&
(pkt->flags & AV_PKT_FLAG_KEY) && pkt->dts != AV_NOPTS_VALUE) {
ff_reduce_index(s, st->index);
av_add_index_entry(st, pkt->pos, pkt->dts,
0, 0, AVINDEX_KEYFRAME);
}
got_packet = 1;
} else if (st->discard < AVDISCARD_ALL) {
if ((ret = parse_packet(s, pkt, pkt->stream_index, 0)) < 0)
return ret;
st->codecpar->sample_rate = sti->avctx->sample_rate;
st->codecpar->bit_rate = sti->avctx->bit_rate;
st->codecpar->channels = sti->avctx->channels;
st->codecpar->channel_layout = sti->avctx->channel_layout;
st->codecpar->codec_id = sti->avctx->codec_id;
} else {
/* free packet */
av_packet_unref(pkt);
}
if (pkt->flags & AV_PKT_FLAG_KEY)
sti->skip_to_keyframe = 0;
if (sti->skip_to_keyframe) {
av_packet_unref(pkt);
got_packet = 0;
}
}
if (!got_packet && si->parse_queue)
ret = avpriv_packet_list_get(&si->parse_queue, &si->parse_queue_end, pkt);
if (ret >= 0) {
AVStream *const st = s->streams[pkt->stream_index];
FFStream *const sti = ffstream(st);
int discard_padding = 0;
if (sti->first_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
int64_t pts = pkt->pts - (is_relative(pkt->pts) ? RELATIVE_TS_BASE : 0);
int64_t sample = ts_to_samples(st, pts);
int duration = ts_to_samples(st, pkt->duration);
int64_t end_sample = sample + duration;
if (duration > 0 && end_sample >= sti->first_discard_sample &&
sample < sti->last_discard_sample)
discard_padding = FFMIN(end_sample - sti->first_discard_sample, duration);
}
if (sti->start_skip_samples && (pkt->pts == 0 || pkt->pts == RELATIVE_TS_BASE))
sti->skip_samples = sti->start_skip_samples;
if (sti->skip_samples || discard_padding) {
uint8_t *p = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
if (p) {
AV_WL32(p, sti->skip_samples);
AV_WL32(p + 4, discard_padding);
av_log(s, AV_LOG_DEBUG, "demuxer injecting skip %d / discard %d\n", sti->skip_samples, discard_padding);
}
sti->skip_samples = 0;
}
if (sti->inject_global_side_data) {
for (int i = 0; i < st->nb_side_data; i++) {
const AVPacketSideData *const src_sd = &st->side_data[i];
uint8_t *dst_data;
if (av_packet_get_side_data(pkt, src_sd->type, NULL))
continue;
dst_data = av_packet_new_side_data(pkt, src_sd->type, src_sd->size);
if (!dst_data) {
av_log(s, AV_LOG_WARNING, "Could not inject global side data\n");
continue;
}
memcpy(dst_data, src_sd->data, src_sd->size);
}
sti->inject_global_side_data = 0;
}
}
av_opt_get_dict_val(s, "metadata", AV_OPT_SEARCH_CHILDREN, &metadata);
if (metadata) {
s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
av_dict_copy(&s->metadata, metadata, 0);
av_dict_free(&metadata);
av_opt_set_dict_val(s, "metadata", NULL, AV_OPT_SEARCH_CHILDREN);
}
if (s->debug & FF_FDEBUG_TS)
av_log(s, AV_LOG_DEBUG,
"read_frame_internal stream=%d, pts=%s, dts=%s, "
"size=%d, duration=%"PRId64", flags=%d\n",
pkt->stream_index,
av_ts2str(pkt->pts),
av_ts2str(pkt->dts),
pkt->size, pkt->duration, pkt->flags);
/* A demuxer might have returned EOF because of an IO error, let's
* propagate this back to the user. */
if (ret == AVERROR_EOF && s->pb && s->pb->error < 0 && s->pb->error != AVERROR(EAGAIN))
ret = s->pb->error;
return ret;
}
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
{
FFFormatContext *const si = ffformatcontext(s);
const int genpts = s->flags & AVFMT_FLAG_GENPTS;
int eof = 0;
int ret;
AVStream *st;
if (!genpts) {
ret = si->packet_buffer
? avpriv_packet_list_get(&si->packet_buffer,
&si->packet_buffer_end, pkt)
: read_frame_internal(s, pkt);
if (ret < 0)
return ret;
goto return_packet;
}
for (;;) {
PacketList *pktl = si->packet_buffer;
if (pktl) {
AVPacket *next_pkt = &pktl->pkt;
if (next_pkt->dts != AV_NOPTS_VALUE) {
int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits;
// last dts seen for this stream. if any of packets following
// current one had no dts, we will set this to AV_NOPTS_VALUE.
int64_t last_dts = next_pkt->dts;
av_assert2(wrap_bits <= 64);
while (pktl && next_pkt->pts == AV_NOPTS_VALUE) {
if (pktl->pkt.stream_index == next_pkt->stream_index &&
av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2ULL << (wrap_bits - 1)) < 0) {
if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2ULL << (wrap_bits - 1))) {
// not B-frame
next_pkt->pts = pktl->pkt.dts;
}
if (last_dts != AV_NOPTS_VALUE) {
// Once last dts was set to AV_NOPTS_VALUE, we don't change it.
last_dts = pktl->pkt.dts;
}
}
pktl = pktl->next;
}
if (eof && next_pkt->pts == AV_NOPTS_VALUE && last_dts != AV_NOPTS_VALUE) {
// Fixing the last reference frame had none pts issue (For MXF etc).
// We only do this when
// 1. eof.
// 2. we are not able to resolve a pts value for current packet.
// 3. the packets for this stream at the end of the files had valid dts.
next_pkt->pts = last_dts + next_pkt->duration;
}
pktl = si->packet_buffer;
}
/* read packet from packet buffer, if there is data */
st = s->streams[next_pkt->stream_index];
if (!(next_pkt->pts == AV_NOPTS_VALUE && st->discard < AVDISCARD_ALL &&
next_pkt->dts != AV_NOPTS_VALUE && !eof)) {
ret = avpriv_packet_list_get(&si->packet_buffer,
&si->packet_buffer_end, pkt);
goto return_packet;
}
}
ret = read_frame_internal(s, pkt);
if (ret < 0) {
if (pktl && ret != AVERROR(EAGAIN)) {
eof = 1;
continue;
} else
return ret;
}
ret = avpriv_packet_list_put(&si->packet_buffer,
&si->packet_buffer_end,
pkt, NULL, 0);
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
}
return_packet:
st = s->streams[pkt->stream_index];
if ((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & AV_PKT_FLAG_KEY) {
ff_reduce_index(s, st->index);
av_add_index_entry(st, pkt->pos, pkt->dts, 0, 0, AVINDEX_KEYFRAME);
}
if (is_relative(pkt->dts))
pkt->dts -= RELATIVE_TS_BASE;
if (is_relative(pkt->pts))
pkt->pts -= RELATIVE_TS_BASE;
return ret;
}
/**
* Return TRUE if the stream has accurate duration in any stream.
*
* @return TRUE if the stream has accurate duration for at least one component.
*/
static int has_duration(AVFormatContext *ic)
{
for (unsigned i = 0; i < ic->nb_streams; i++) {
const AVStream *const st = ic->streams[i];
if (st->duration != AV_NOPTS_VALUE)
return 1;
}
if (ic->duration != AV_NOPTS_VALUE)
return 1;
return 0;
}
/**
* Estimate the stream timings from the one of each components.
*
* Also computes the global bitrate if possible.
*/
static void update_stream_timings(AVFormatContext *ic)
{
int64_t start_time, start_time1, start_time_text, end_time, end_time1, end_time_text;
int64_t duration, duration1, duration_text, filesize;
start_time = INT64_MAX;
start_time_text = INT64_MAX;
end_time = INT64_MIN;
end_time_text = INT64_MIN;
duration = INT64_MIN;
duration_text = INT64_MIN;
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
int is_text = st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ||
st->codecpar->codec_type == AVMEDIA_TYPE_DATA;
if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
start_time1 = av_rescale_q(st->start_time, st->time_base,
AV_TIME_BASE_Q);
if (is_text)
start_time_text = FFMIN(start_time_text, start_time1);
else
start_time = FFMIN(start_time, start_time1);
end_time1 = av_rescale_q_rnd(st->duration, st->time_base,
AV_TIME_BASE_Q,
AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
if (end_time1 != AV_NOPTS_VALUE && (end_time1 > 0 ? start_time1 <= INT64_MAX - end_time1 : start_time1 >= INT64_MIN - end_time1)) {
end_time1 += start_time1;
if (is_text)
end_time_text = FFMAX(end_time_text, end_time1);
else
end_time = FFMAX(end_time, end_time1);
}
for (AVProgram *p = NULL; (p = av_find_program_from_stream(ic, p, i)); ) {
if (p->start_time == AV_NOPTS_VALUE || p->start_time > start_time1)
p->start_time = start_time1;
if (p->end_time < end_time1)
p->end_time = end_time1;
}
}
if (st->duration != AV_NOPTS_VALUE) {
duration1 = av_rescale_q(st->duration, st->time_base,
AV_TIME_BASE_Q);
if (is_text)
duration_text = FFMAX(duration_text, duration1);
else
duration = FFMAX(duration, duration1);
}
}
if (start_time == INT64_MAX || (start_time > start_time_text && start_time - (uint64_t)start_time_text < AV_TIME_BASE))
start_time = start_time_text;
else if (start_time > start_time_text)
av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream starttime %f\n", start_time_text / (float)AV_TIME_BASE);
if (end_time == INT64_MIN || (end_time < end_time_text && end_time_text - (uint64_t)end_time < AV_TIME_BASE))
end_time = end_time_text;
else if (end_time < end_time_text)
av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream endtime %f\n", end_time_text / (float)AV_TIME_BASE);
if (duration == INT64_MIN || (duration < duration_text && duration_text - duration < AV_TIME_BASE))
duration = duration_text;
else if (duration < duration_text)
av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream duration %f\n", duration_text / (float)AV_TIME_BASE);
if (start_time != INT64_MAX) {
ic->start_time = start_time;
if (end_time != INT64_MIN) {
if (ic->nb_programs > 1) {
for (unsigned i = 0; i < ic->nb_programs; i++) {
AVProgram *const p = ic->programs[i];
if (p->start_time != AV_NOPTS_VALUE &&
p->end_time > p->start_time &&
p->end_time - (uint64_t)p->start_time <= INT64_MAX)
duration = FFMAX(duration, p->end_time - p->start_time);
}
} else if (end_time >= start_time && end_time - (uint64_t)start_time <= INT64_MAX) {
duration = FFMAX(duration, end_time - start_time);
}
}
}
if (duration != INT64_MIN && duration > 0 && ic->duration == AV_NOPTS_VALUE) {
ic->duration = duration;
}
if (ic->pb && (filesize = avio_size(ic->pb)) > 0 && ic->duration > 0) {
/* compute the bitrate */
double bitrate = (double) filesize * 8.0 * AV_TIME_BASE /
(double) ic->duration;
if (bitrate >= 0 && bitrate <= INT64_MAX)
ic->bit_rate = bitrate;
}
}
static void fill_all_stream_timings(AVFormatContext *ic)
{
update_stream_timings(ic);
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
if (st->start_time == AV_NOPTS_VALUE) {
if (ic->start_time != AV_NOPTS_VALUE)
st->start_time = av_rescale_q(ic->start_time, AV_TIME_BASE_Q,
st->time_base);
if (ic->duration != AV_NOPTS_VALUE)
st->duration = av_rescale_q(ic->duration, AV_TIME_BASE_Q,
st->time_base);
}
}
}
static void estimate_timings_from_bit_rate(AVFormatContext *ic)
{
FFFormatContext *const si = ffformatcontext(ic);
int show_warning = 0;
/* if bit_rate is already set, we believe it */
if (ic->bit_rate <= 0) {
int64_t bit_rate = 0;
for (unsigned i = 0; i < ic->nb_streams; i++) {
const AVStream *const st = ic->streams[i];
const FFStream *const sti = cffstream(st);
if (st->codecpar->bit_rate <= 0 && sti->avctx->bit_rate > 0)
st->codecpar->bit_rate = sti->avctx->bit_rate;
if (st->codecpar->bit_rate > 0) {
if (INT64_MAX - st->codecpar->bit_rate < bit_rate) {
bit_rate = 0;
break;
}
bit_rate += st->codecpar->bit_rate;
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && sti->codec_info_nb_frames > 1) {
// If we have a videostream with packets but without a bitrate
// then consider the sum not known
bit_rate = 0;
break;
}
}
ic->bit_rate = bit_rate;
}
/* if duration is already set, we believe it */
if (ic->duration == AV_NOPTS_VALUE &&
ic->bit_rate != 0) {
int64_t filesize = ic->pb ? avio_size(ic->pb) : 0;
if (filesize > si->data_offset) {
filesize -= si->data_offset;
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
if ( st->time_base.num <= INT64_MAX / ic->bit_rate
&& st->duration == AV_NOPTS_VALUE) {
st->duration = av_rescale(filesize, 8LL * st->time_base.den,
ic->bit_rate *
(int64_t) st->time_base.num);
show_warning = 1;
}
}
}
}
if (show_warning)
av_log(ic, AV_LOG_WARNING,
"Estimating duration from bitrate, this may be inaccurate\n");
}
#define DURATION_MAX_READ_SIZE 250000LL
#define DURATION_MAX_RETRY 6
/* only usable for MPEG-PS streams */
static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
{
FFFormatContext *const si = ffformatcontext(ic);
AVPacket *const pkt = si->pkt;
int num, den, read_size, ret;
int found_duration = 0;
int is_end;
int64_t filesize, offset, duration;
int retry = 0;
/* flush packet queue */
ff_flush_packet_queue(ic);
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
if (st->start_time == AV_NOPTS_VALUE &&
sti->first_dts == AV_NOPTS_VALUE &&
st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN)
av_log(ic, AV_LOG_WARNING,
"start time for stream %d is not set in estimate_timings_from_pts\n", i);
if (sti->parser) {
av_parser_close(sti->parser);
sti->parser = NULL;
}
}
if (ic->skip_estimate_duration_from_pts) {
av_log(ic, AV_LOG_INFO, "Skipping duration calculation in estimate_timings_from_pts\n");
goto skip_duration_calc;
}
av_opt_set_int(ic, "skip_changes", 1, AV_OPT_SEARCH_CHILDREN);
/* estimate the end time (duration) */
/* XXX: may need to support wrapping */
filesize = ic->pb ? avio_size(ic->pb) : 0;
do {
is_end = found_duration;
offset = filesize - (DURATION_MAX_READ_SIZE << retry);
if (offset < 0)
offset = 0;
avio_seek(ic->pb, offset, SEEK_SET);
read_size = 0;
for (;;) {
AVStream *st;
FFStream *sti;
if (read_size >= DURATION_MAX_READ_SIZE << (FFMAX(retry - 1, 0)))
break;
do {
ret = ff_read_packet(ic, pkt);
} while (ret == AVERROR(EAGAIN));
if (ret != 0)
break;
read_size += pkt->size;
st = ic->streams[pkt->stream_index];
sti = ffstream(st);
if (pkt->pts != AV_NOPTS_VALUE &&
(st->start_time != AV_NOPTS_VALUE ||
sti->first_dts != AV_NOPTS_VALUE)) {
if (pkt->duration == 0) {
compute_frame_duration(ic, &num, &den, st, sti->parser, pkt);
if (den && num) {
pkt->duration = av_rescale_rnd(1,
num * (int64_t) st->time_base.den,
den * (int64_t) st->time_base.num,
AV_ROUND_DOWN);
}
}
duration = pkt->pts + pkt->duration;
found_duration = 1;
if (st->start_time != AV_NOPTS_VALUE)
duration -= st->start_time;
else
duration -= sti->first_dts;
if (duration > 0) {
if (st->duration == AV_NOPTS_VALUE || sti->info->last_duration<= 0 ||
(st->duration < duration && FFABS(duration - sti->info->last_duration) < 60LL*st->time_base.den / st->time_base.num))
st->duration = duration;
sti->info->last_duration = duration;
}
}
av_packet_unref(pkt);
}
/* check if all audio/video streams have valid duration */
if (!is_end) {
is_end = 1;
for (unsigned i = 0; i < ic->nb_streams; i++) {
const AVStream *const st = ic->streams[i];
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
case AVMEDIA_TYPE_AUDIO:
if (st->duration == AV_NOPTS_VALUE)
is_end = 0;
}
}
}
} while (!is_end &&
offset &&
++retry <= DURATION_MAX_RETRY);
av_opt_set_int(ic, "skip_changes", 0, AV_OPT_SEARCH_CHILDREN);
/* warn about audio/video streams which duration could not be estimated */
for (unsigned i = 0; i < ic->nb_streams; i++) {
const AVStream *const st = ic->streams[i];
const FFStream *const sti = cffstream(st);
if (st->duration == AV_NOPTS_VALUE) {
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
case AVMEDIA_TYPE_AUDIO:
if (st->start_time != AV_NOPTS_VALUE || sti->first_dts != AV_NOPTS_VALUE) {
av_log(ic, AV_LOG_WARNING, "stream %d : no PTS found at end of file, duration not set\n", i);
} else
av_log(ic, AV_LOG_WARNING, "stream %d : no TS found at start of file, duration not set\n", i);
}
}
}
skip_duration_calc:
fill_all_stream_timings(ic);
avio_seek(ic->pb, old_offset, SEEK_SET);
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
sti->cur_dts = sti->first_dts;
sti->last_IP_pts = AV_NOPTS_VALUE;
sti->last_dts_for_order_check = AV_NOPTS_VALUE;
for (int j = 0; j < MAX_REORDER_DELAY + 1; j++)
sti->pts_buffer[j] = AV_NOPTS_VALUE;
}
}
/* 1:1 map to AVDurationEstimationMethod */
static const char *const duration_name[] = {
[AVFMT_DURATION_FROM_PTS] = "pts",
[AVFMT_DURATION_FROM_STREAM] = "stream",
[AVFMT_DURATION_FROM_BITRATE] = "bit rate",
};
static const char *duration_estimate_name(enum AVDurationEstimationMethod method)
{
return duration_name[method];
}
static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
{
int64_t file_size;
/* get the file size, if possible */
if (ic->iformat->flags & AVFMT_NOFILE) {
file_size = 0;
} else {
file_size = avio_size(ic->pb);
file_size = FFMAX(0, file_size);
}
if ((!strcmp(ic->iformat->name, "mpeg") ||
!strcmp(ic->iformat->name, "mpegts")) &&
file_size && (ic->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
/* get accurate estimate from the PTSes */
estimate_timings_from_pts(ic, old_offset);
ic->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
} else if (has_duration(ic)) {
/* at least one component has timings - we use them for all
* the components */
fill_all_stream_timings(ic);
/* nut demuxer estimate the duration from PTS */
if (!strcmp(ic->iformat->name, "nut"))
ic->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
else
ic->duration_estimation_method = AVFMT_DURATION_FROM_STREAM;
} else {
/* less precise: use bitrate info */
estimate_timings_from_bit_rate(ic);
ic->duration_estimation_method = AVFMT_DURATION_FROM_BITRATE;
}
update_stream_timings(ic);
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
if (st->time_base.den)
av_log(ic, AV_LOG_TRACE, "stream %u: start_time: %s duration: %s\n", i,
av_ts2timestr(st->start_time, &st->time_base),
av_ts2timestr(st->duration, &st->time_base));
}
av_log(ic, AV_LOG_TRACE,
"format: start_time: %s duration: %s (estimate from %s) bitrate=%"PRId64" kb/s\n",
av_ts2timestr(ic->start_time, &AV_TIME_BASE_Q),
av_ts2timestr(ic->duration, &AV_TIME_BASE_Q),
duration_estimate_name(ic->duration_estimation_method),
(int64_t)ic->bit_rate / 1000);
}
static int determinable_frame_size(const AVCodecContext *avctx)
{
switch(avctx->codec_id) {
case AV_CODEC_ID_MP1:
case AV_CODEC_ID_MP2:
case AV_CODEC_ID_MP3:
case AV_CODEC_ID_CODEC2:
return 1;
}
return 0;
}
static int has_codec_parameters(const AVStream *st, const char **errmsg_ptr)
{
const FFStream *const sti = cffstream(st);
const AVCodecContext *const avctx = sti->avctx;
#define FAIL(errmsg) do { \
if (errmsg_ptr) \
*errmsg_ptr = errmsg; \
return 0; \
} while (0)
if ( avctx->codec_id == AV_CODEC_ID_NONE
&& avctx->codec_type != AVMEDIA_TYPE_DATA)
FAIL("unknown codec");
switch (avctx->codec_type) {
case AVMEDIA_TYPE_AUDIO:
if (!avctx->frame_size && determinable_frame_size(avctx))
FAIL("unspecified frame size");
if (sti->info->found_decoder >= 0 &&
avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
FAIL("unspecified sample format");
if (!avctx->sample_rate)
FAIL("unspecified sample rate");
if (!avctx->channels)
FAIL("unspecified number of channels");
if (sti->info->found_decoder >= 0 && !sti->nb_decoded_frames && avctx->codec_id == AV_CODEC_ID_DTS)
FAIL("no decodable DTS frames");
break;
case AVMEDIA_TYPE_VIDEO:
if (!avctx->width)
FAIL("unspecified size");
if (sti->info->found_decoder >= 0 && avctx->pix_fmt == AV_PIX_FMT_NONE)
FAIL("unspecified pixel format");
if (st->codecpar->codec_id == AV_CODEC_ID_RV30 || st->codecpar->codec_id == AV_CODEC_ID_RV40)
if (!st->sample_aspect_ratio.num && !st->codecpar->sample_aspect_ratio.num && !sti->codec_info_nb_frames)
FAIL("no frame in rv30/40 and no sar");
break;
case AVMEDIA_TYPE_SUBTITLE:
if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
FAIL("unspecified size");
break;
case AVMEDIA_TYPE_DATA:
if (avctx->codec_id == AV_CODEC_ID_NONE) return 1;
}
return 1;
}
/* returns 1 or 0 if or if not decoded data was returned, or a negative error */
static int try_decode_frame(AVFormatContext *s, AVStream *st,
const AVPacket *avpkt, AVDictionary **options)
{
FFStream *const sti = ffstream(st);
AVCodecContext *const avctx = sti->avctx;
const AVCodec *codec;
int got_picture = 1, ret = 0;
AVFrame *frame = av_frame_alloc();
AVSubtitle subtitle;
AVPacket pkt = *avpkt;
int do_skip_frame = 0;
enum AVDiscard skip_frame;
if (!frame)
return AVERROR(ENOMEM);
if (!avcodec_is_open(avctx) &&
sti->info->found_decoder <= 0 &&
(st->codecpar->codec_id != -sti->info->found_decoder || !st->codecpar->codec_id)) {
AVDictionary *thread_opt = NULL;
codec = find_probe_decoder(s, st, st->codecpar->codec_id);
if (!codec) {
sti->info->found_decoder = -st->codecpar->codec_id;
ret = -1;
goto fail;
}
/* Force thread count to 1 since the H.264 decoder will not extract
* SPS and PPS to extradata during multi-threaded decoding. */
av_dict_set(options ? options : &thread_opt, "threads", "1", 0);
/* Force lowres to 0. The decoder might reduce the video size by the
* lowres factor, and we don't want that propagated to the stream's
* codecpar */
av_dict_set(options ? options : &thread_opt, "lowres", "0", 0);
if (s->codec_whitelist)
av_dict_set(options ? options : &thread_opt, "codec_whitelist", s->codec_whitelist, 0);
ret = avcodec_open2(avctx, codec, options ? options : &thread_opt);
if (!options)
av_dict_free(&thread_opt);
if (ret < 0) {
sti->info->found_decoder = -avctx->codec_id;
goto fail;
}
sti->info->found_decoder = 1;
} else if (!sti->info->found_decoder)
sti->info->found_decoder = 1;
if (sti->info->found_decoder < 0) {
ret = -1;
goto fail;
}
if (avpriv_codec_get_cap_skip_frame_fill_param(avctx->codec)) {
do_skip_frame = 1;
skip_frame = avctx->skip_frame;
avctx->skip_frame = AVDISCARD_ALL;
}
while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
ret >= 0 &&
(!has_codec_parameters(st, NULL) || !has_decode_delay_been_guessed(st) ||
(!sti->codec_info_nb_frames &&
(avctx->codec->capabilities & AV_CODEC_CAP_CHANNEL_CONF)))) {
got_picture = 0;
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
ret = avcodec_send_packet(avctx, &pkt);
if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
break;
if (ret >= 0)
pkt.size = 0;
ret = avcodec_receive_frame(avctx, frame);
if (ret >= 0)
got_picture = 1;
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
ret = 0;
} else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
ret = avcodec_decode_subtitle2(avctx, &subtitle,
&got_picture, &pkt);
if (got_picture)
avsubtitle_free(&subtitle);
if (ret >= 0)
pkt.size = 0;
}
if (ret >= 0) {
if (got_picture)
sti->nb_decoded_frames++;
ret = got_picture;
}
}
fail:
if (do_skip_frame) {
avctx->skip_frame = skip_frame;
}
av_frame_free(&frame);
return ret;
}
static int chapter_start_cmp(const void *p1, const void *p2)
{
const AVChapter *const ch1 = *(AVChapter**)p1;
const AVChapter *const ch2 = *(AVChapter**)p2;
int delta = av_compare_ts(ch1->start, ch1->time_base, ch2->start, ch2->time_base);
if (delta)
return delta;
return FFDIFFSIGN(ch1->id, ch2->id);
}
static int compute_chapters_end(AVFormatContext *s)
{
int64_t max_time = 0;
AVChapter **timetable;
if (!s->nb_chapters)
return 0;
if (s->duration > 0 && s->start_time < INT64_MAX - s->duration)
max_time = s->duration +
((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
timetable = av_memdup(s->chapters, s->nb_chapters * sizeof(*timetable));
if (!timetable)
return AVERROR(ENOMEM);
qsort(timetable, s->nb_chapters, sizeof(*timetable), chapter_start_cmp);
for (unsigned i = 0; i < s->nb_chapters; i++)
if (timetable[i]->end == AV_NOPTS_VALUE) {
AVChapter *const ch = timetable[i];
int64_t end = max_time ? av_rescale_q(max_time, AV_TIME_BASE_Q,
ch->time_base)
: INT64_MAX;
if (i + 1 < s->nb_chapters) {
const AVChapter *const ch1 = timetable[i + 1];
int64_t next_start = av_rescale_q(ch1->start, ch1->time_base,
ch->time_base);
if (next_start > ch->start && next_start < end)
end = next_start;
}
ch->end = (end == INT64_MAX || end < ch->start) ? ch->start : end;
}
av_free(timetable);
return 0;
}
static int get_std_framerate(int i)
{
if (i < 30*12)
return (i + 1) * 1001;
i -= 30*12;
if (i < 30)
return (i + 31) * 1001 * 12;
i -= 30;
if (i < 3)
return ((const int[]) { 80, 120, 240})[i] * 1001 * 12;
i -= 3;
return ((const int[]) { 24, 30, 60, 12, 15, 48 })[i] * 1000 * 12;
}
/* Is the time base unreliable?
* This is a heuristic to balance between quick acceptance of the values in
* the headers vs. some extra checks.
* Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
* MPEG-2 commonly misuses field repeat flags to store different framerates.
* And there are "variable" fps files this needs to detect as well. */
static int tb_unreliable(AVCodecContext *c)
{
if (c->time_base.den >= 101LL * c->time_base.num ||
c->time_base.den < 5LL * c->time_base.num ||
// c->codec_tag == AV_RL32("DIVX") ||
// c->codec_tag == AV_RL32("XVID") ||
c->codec_tag == AV_RL32("mp4v") ||
c->codec_id == AV_CODEC_ID_MPEG2VIDEO ||
c->codec_id == AV_CODEC_ID_GIF ||
c->codec_id == AV_CODEC_ID_HEVC ||
c->codec_id == AV_CODEC_ID_H264)
return 1;
return 0;
}
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
{
FFStream *const sti = ffstream(st);
int64_t last = sti->info->last_dts;
if ( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
&& ts - (uint64_t)last < INT64_MAX) {
double dts = (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
int64_t duration = ts - last;
if (!sti->info->duration_error)
sti->info->duration_error = av_mallocz(sizeof(sti->info->duration_error[0])*2);
if (!sti->info->duration_error)
return AVERROR(ENOMEM);
// if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
// av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
for (int i = 0; i < MAX_STD_TIMEBASES; i++) {
if (sti->info->duration_error[0][1][i] < 1e10) {
int framerate = get_std_framerate(i);
double sdts = dts*framerate/(1001*12);
for (int j = 0; j < 2; j++) {
int64_t ticks = llrint(sdts+j*0.5);
double error = sdts - ticks + j*0.5;
sti->info->duration_error[j][0][i] += error;
sti->info->duration_error[j][1][i] += error*error;
}
}
}
if (sti->info->rfps_duration_sum <= INT64_MAX - duration) {
sti->info->duration_count++;
sti->info->rfps_duration_sum += duration;
}
if (sti->info->duration_count % 10 == 0) {
int n = sti->info->duration_count;
for (int i = 0; i < MAX_STD_TIMEBASES; i++) {
if (sti->info->duration_error[0][1][i] < 1e10) {
double a0 = sti->info->duration_error[0][0][i] / n;
double error0 = sti->info->duration_error[0][1][i] / n - a0*a0;
double a1 = sti->info->duration_error[1][0][i] / n;
double error1 = sti->info->duration_error[1][1][i] / n - a1*a1;
if (error0 > 0.04 && error1 > 0.04) {
sti->info->duration_error[0][1][i] = 2e10;
sti->info->duration_error[1][1][i] = 2e10;
}
}
}
}
// ignore the first 4 values, they might have some random jitter
if (sti->info->duration_count > 3 && is_relative(ts) == is_relative(last))
sti->info->duration_gcd = av_gcd(sti->info->duration_gcd, duration);
}
if (ts != AV_NOPTS_VALUE)
sti->info->last_dts = ts;
return 0;
}
void ff_rfps_calculate(AVFormatContext *ic)
{
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
continue;
// the check for tb_unreliable() is not completely correct, since this is not about handling
// an unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
// ipmovie.c produces.
if (tb_unreliable(sti->avctx) && sti->info->duration_count > 15 && sti->info->duration_gcd > FFMAX(1, st->time_base.den/(500LL*st->time_base.num)) && !st->r_frame_rate.num &&
sti->info->duration_gcd < INT64_MAX / st->time_base.num)
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, st->time_base.den, st->time_base.num * sti->info->duration_gcd, INT_MAX);
if (sti->info->duration_count > 1 && !st->r_frame_rate.num
&& tb_unreliable(sti->avctx)) {
int num = 0;
double best_error = 0.01;
AVRational ref_rate = st->r_frame_rate.num ? st->r_frame_rate : av_inv_q(st->time_base);
for (int j = 0; j < MAX_STD_TIMEBASES; j++) {
if (sti->info->codec_info_duration &&
sti->info->codec_info_duration*av_q2d(st->time_base) < (1001*11.5)/get_std_framerate(j))
continue;
if (!sti->info->codec_info_duration && get_std_framerate(j) < 1001*12)
continue;
if (av_q2d(st->time_base) * sti->info->rfps_duration_sum / sti->info->duration_count < (1001*12.0 * 0.8)/get_std_framerate(j))
continue;
for (int k = 0; k < 2; k++) {
int n = sti->info->duration_count;
double a = sti->info->duration_error[k][0][j] / n;
double error = sti->info->duration_error[k][1][j]/n - a*a;
if (error < best_error && best_error> 0.000000001) {
best_error= error;
num = get_std_framerate(j);
}
if (error < 0.02)
av_log(ic, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
}
}
// do not increase frame rate by more than 1 % in order to match a standard rate.
if (num && (!ref_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(ref_rate)))
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
}
if ( !st->avg_frame_rate.num
&& st->r_frame_rate.num && sti->info->rfps_duration_sum
&& sti->info->codec_info_duration <= 0
&& sti->info->duration_count > 2
&& fabs(1.0 / (av_q2d(st->r_frame_rate) * av_q2d(st->time_base)) - sti->info->rfps_duration_sum / (double)sti->info->duration_count) <= 1.0
) {
av_log(ic, AV_LOG_DEBUG, "Setting avg frame rate based on r frame rate\n");
st->avg_frame_rate = st->r_frame_rate;
}
av_freep(&sti->info->duration_error);
sti->info->last_dts = AV_NOPTS_VALUE;
sti->info->duration_count = 0;
sti->info->rfps_duration_sum = 0;
}
}
static int extract_extradata_check(AVStream *st)
{
const AVBitStreamFilter *const f = av_bsf_get_by_name("extract_extradata");
if (!f)
return 0;
if (f->codec_ids) {
const enum AVCodecID *ids;
for (ids = f->codec_ids; *ids != AV_CODEC_ID_NONE; ids++)
if (*ids == st->codecpar->codec_id)
return 1;
}
return 0;
}
static int extract_extradata_init(AVStream *st)
{
FFStream *const sti = ffstream(st);
const AVBitStreamFilter *f;
int ret;
f = av_bsf_get_by_name("extract_extradata");
if (!f)
goto finish;
/* check that the codec id is supported */
ret = extract_extradata_check(st);
if (!ret)
goto finish;
ret = av_bsf_alloc(f, &sti->extract_extradata.bsf);
if (ret < 0)
return ret;
ret = avcodec_parameters_copy(sti->extract_extradata.bsf->par_in,
st->codecpar);
if (ret < 0)
goto fail;
sti->extract_extradata.bsf->time_base_in = st->time_base;
ret = av_bsf_init(sti->extract_extradata.bsf);
if (ret < 0)
goto fail;
finish:
sti->extract_extradata.inited = 1;
return 0;
fail:
av_bsf_free(&sti->extract_extradata.bsf);
return ret;
}
static int extract_extradata(FFFormatContext *si, AVStream *st, const AVPacket *pkt)
{
FFStream *const sti = ffstream(st);
AVPacket *const pkt_ref = si->parse_pkt;
int ret;
if (!sti->extract_extradata.inited) {
ret = extract_extradata_init(st);
if (ret < 0)
return ret;
}
if (sti->extract_extradata.inited && !sti->extract_extradata.bsf)
return 0;
ret = av_packet_ref(pkt_ref, pkt);
if (ret < 0)
return ret;
ret = av_bsf_send_packet(sti->extract_extradata.bsf, pkt_ref);
if (ret < 0) {
av_packet_unref(pkt_ref);
return ret;
}
while (ret >= 0 && !sti->avctx->extradata) {
ret = av_bsf_receive_packet(sti->extract_extradata.bsf, pkt_ref);
if (ret < 0) {
if (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
return ret;
continue;
}
for (int i = 0; i < pkt_ref->side_data_elems; i++) {
AVPacketSideData *const side_data = &pkt_ref->side_data[i];
if (side_data->type == AV_PKT_DATA_NEW_EXTRADATA) {
sti->avctx->extradata = side_data->data;
sti->avctx->extradata_size = side_data->size;
side_data->data = NULL;
side_data->size = 0;
break;
}
}
av_packet_unref(pkt_ref);
}
return 0;
}
static int add_coded_side_data(AVStream *st, AVCodecContext *avctx)
{
for (int i = 0; i < avctx->nb_coded_side_data; i++) {
const AVPacketSideData *const sd_src = &avctx->coded_side_data[i];
uint8_t *dst_data;
dst_data = av_stream_new_side_data(st, sd_src->type, sd_src->size);
if (!dst_data)
return AVERROR(ENOMEM);
memcpy(dst_data, sd_src->data, sd_src->size);
}
return 0;
}
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
{
FFFormatContext *const si = ffformatcontext(ic);
int count = 0, ret = 0;
int64_t read_size;
AVPacket *pkt1 = si->pkt;
int64_t old_offset = avio_tell(ic->pb);
// new streams might appear, no options for those
int orig_nb_streams = ic->nb_streams;
int flush_codecs;
int64_t max_analyze_duration = ic->max_analyze_duration;
int64_t max_stream_analyze_duration;
int64_t max_subtitle_analyze_duration;
int64_t probesize = ic->probesize;
int eof_reached = 0;
int *missing_streams = av_opt_ptr(ic->iformat->priv_class, ic->priv_data, "missing_streams");
flush_codecs = probesize > 0;
av_opt_set_int(ic, "skip_clear", 1, AV_OPT_SEARCH_CHILDREN);
max_stream_analyze_duration = max_analyze_duration;
max_subtitle_analyze_duration = max_analyze_duration;
if (!max_analyze_duration) {
max_stream_analyze_duration =
max_analyze_duration = 5*AV_TIME_BASE;
max_subtitle_analyze_duration = 30*AV_TIME_BASE;
if (!strcmp(ic->iformat->name, "flv"))
max_stream_analyze_duration = 90*AV_TIME_BASE;
if (!strcmp(ic->iformat->name, "mpeg") || !strcmp(ic->iformat->name, "mpegts"))
max_stream_analyze_duration = 7*AV_TIME_BASE;
}
if (ic->pb) {
FFIOContext *const ctx = ffiocontext(ic->pb);
av_log(ic, AV_LOG_DEBUG, "Before avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d nb_streams:%d\n",
avio_tell(ic->pb), ctx->bytes_read, ctx->seek_count, ic->nb_streams);
}
for (unsigned i = 0; i < ic->nb_streams; i++) {
const AVCodec *codec;
AVDictionary *thread_opt = NULL;
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
AVCodecContext *const avctx = sti->avctx;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) {
/* if (!st->time_base.num)
st->time_base = */
if (!avctx->time_base.num)
avctx->time_base = st->time_base;
}
/* check if the caller has overridden the codec id */
// only for the split stuff
if (!sti->parser && !(ic->flags & AVFMT_FLAG_NOPARSE) && sti->request_probe <= 0) {
sti->parser = av_parser_init(st->codecpar->codec_id);
if (sti->parser) {
if (sti->need_parsing == AVSTREAM_PARSE_HEADERS) {
sti->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
} else if (sti->need_parsing == AVSTREAM_PARSE_FULL_RAW) {
sti->parser->flags |= PARSER_FLAG_USE_CODEC_TS;
}
} else if (sti->need_parsing) {
av_log(ic, AV_LOG_VERBOSE, "parser not found for codec "
"%s, packets or times may be invalid.\n",
avcodec_get_name(st->codecpar->codec_id));
}
}
ret = avcodec_parameters_to_context(avctx, st->codecpar);
if (ret < 0)
goto find_stream_info_err;
if (sti->request_probe <= 0)
sti->avctx_inited = 1;
codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
/* Force thread count to 1 since the H.264 decoder will not extract
* SPS and PPS to extradata during multi-threaded decoding. */
av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
/* Force lowres to 0. The decoder might reduce the video size by the
* lowres factor, and we don't want that propagated to the stream's
* codecpar */
av_dict_set(options ? &options[i] : &thread_opt, "lowres", "0", 0);
if (ic->codec_whitelist)
av_dict_set(options ? &options[i] : &thread_opt, "codec_whitelist", ic->codec_whitelist, 0);
// Try to just open decoders, in case this is enough to get parameters.
// Also ensure that subtitle_header is properly set.
if (!has_codec_parameters(st, NULL) && sti->request_probe <= 0 ||
st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) {
if (codec && !avctx->codec)
if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
av_log(ic, AV_LOG_WARNING,
"Failed to open codec in %s\n",__FUNCTION__);
}
if (!options)
av_dict_free(&thread_opt);
}
read_size = 0;
for (;;) {
const AVPacket *pkt;
AVStream *st;
FFStream *sti;
AVCodecContext *avctx;
int analyzed_all_streams;
unsigned i;
if (ff_check_interrupt(&ic->interrupt_callback)) {
ret = AVERROR_EXIT;
av_log(ic, AV_LOG_DEBUG, "interrupted\n");
break;
}
/* check if one codec still needs to be handled */
for (i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
int fps_analyze_framecount = 20;
int count;
if (!has_codec_parameters(st, NULL))
break;
/* If the timebase is coarse (like the usual millisecond precision
* of mkv), we need to analyze more frames to reliably arrive at
* the correct fps. */
if (av_q2d(st->time_base) > 0.0005)
fps_analyze_framecount *= 2;
if (!tb_unreliable(sti->avctx))
fps_analyze_framecount = 0;
if (ic->fps_probe_size >= 0)
fps_analyze_framecount = ic->fps_probe_size;
if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)
fps_analyze_framecount = 0;
/* variable fps and no guess at the real fps */
count = (ic->iformat->flags & AVFMT_NOTIMESTAMPS) ?
sti->info->codec_info_duration_fields/2 :
sti->info->duration_count;
if (!(st->r_frame_rate.num && st->avg_frame_rate.num) &&
st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (count < fps_analyze_framecount)
break;
}
// Look at the first 3 frames if there is evidence of frame delay
// but the decoder delay is not set.
if (sti->info->frame_delay_evidence && count < 2 && sti->avctx->has_b_frames == 0)
break;
if (!sti->avctx->extradata &&
(!sti->extract_extradata.inited || sti->extract_extradata.bsf) &&
extract_extradata_check(st))
break;
if (sti->first_dts == AV_NOPTS_VALUE &&
!(ic->iformat->flags & AVFMT_NOTIMESTAMPS) &&
sti->codec_info_nb_frames < ((st->disposition & AV_DISPOSITION_ATTACHED_PIC) ? 1 : ic->max_ts_probe) &&
(st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO))
break;
}
analyzed_all_streams = 0;
if (!missing_streams || !*missing_streams)
if (i == ic->nb_streams) {
analyzed_all_streams = 1;
/* NOTE: If the format has no header, then we need to read some
* packets to get most of the streams, so we cannot stop here. */
if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
/* If we found the info for all the codecs, we can stop. */
ret = count;
av_log(ic, AV_LOG_DEBUG, "All info found\n");
flush_codecs = 0;
break;
}
}
/* We did not get all the codec info, but we read too much data. */
if (read_size >= probesize) {
ret = count;
av_log(ic, AV_LOG_DEBUG,
"Probe buffer size limit of %"PRId64" bytes reached\n", probesize);
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
if (!st->r_frame_rate.num &&
sti->info->duration_count <= 1 &&
st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
strcmp(ic->iformat->name, "image2"))
av_log(ic, AV_LOG_WARNING,
"Stream #%d: not enough frames to estimate rate; "
"consider increasing probesize\n", i);
}
break;
}
/* NOTE: A new stream can be added there if no header in file
* (AVFMTCTX_NOHEADER). */
ret = read_frame_internal(ic, pkt1);
if (ret == AVERROR(EAGAIN))
continue;
if (ret < 0) {
/* EOF or error*/
eof_reached = 1;
break;
}
if (!(ic->flags & AVFMT_FLAG_NOBUFFER)) {
ret = avpriv_packet_list_put(&si->packet_buffer,
&si->packet_buffer_end,
pkt1, NULL, 0);
if (ret < 0)
goto unref_then_goto_end;
pkt = &si->packet_buffer_end->pkt;
} else {
pkt = pkt1;
}
st = ic->streams[pkt->stream_index];
sti = ffstream(st);
if (!(st->disposition & AV_DISPOSITION_ATTACHED_PIC))
read_size += pkt->size;
avctx = sti->avctx;
if (!sti->avctx_inited) {
ret = avcodec_parameters_to_context(avctx, st->codecpar);
if (ret < 0)
goto unref_then_goto_end;
sti->avctx_inited = 1;
}
if (pkt->dts != AV_NOPTS_VALUE && sti->codec_info_nb_frames > 1) {
/* check for non-increasing dts */
if (sti->info->fps_last_dts != AV_NOPTS_VALUE &&
sti->info->fps_last_dts >= pkt->dts) {
av_log(ic, AV_LOG_DEBUG,
"Non-increasing DTS in stream %d: packet %d with DTS "
"%"PRId64", packet %d with DTS %"PRId64"\n",
st->index, sti->info->fps_last_dts_idx,
sti->info->fps_last_dts, sti->codec_info_nb_frames,
pkt->dts);
sti->info->fps_first_dts =
sti->info->fps_last_dts = AV_NOPTS_VALUE;
}
/* Check for a discontinuity in dts. If the difference in dts
* is more than 1000 times the average packet duration in the
* sequence, we treat it as a discontinuity. */
if (sti->info->fps_last_dts != AV_NOPTS_VALUE &&
sti->info->fps_last_dts_idx > sti->info->fps_first_dts_idx &&
(pkt->dts - (uint64_t)sti->info->fps_last_dts) / 1000 >
(sti->info->fps_last_dts - (uint64_t)sti->info->fps_first_dts) /
(sti->info->fps_last_dts_idx - sti->info->fps_first_dts_idx)) {
av_log(ic, AV_LOG_WARNING,
"DTS discontinuity in stream %d: packet %d with DTS "
"%"PRId64", packet %d with DTS %"PRId64"\n",
st->index, sti->info->fps_last_dts_idx,
sti->info->fps_last_dts, sti->codec_info_nb_frames,
pkt->dts);
sti->info->fps_first_dts =
sti->info->fps_last_dts = AV_NOPTS_VALUE;
}
/* update stored dts values */
if (sti->info->fps_first_dts == AV_NOPTS_VALUE) {
sti->info->fps_first_dts = pkt->dts;
sti->info->fps_first_dts_idx = sti->codec_info_nb_frames;
}
sti->info->fps_last_dts = pkt->dts;
sti->info->fps_last_dts_idx = sti->codec_info_nb_frames;
}
if (sti->codec_info_nb_frames > 1) {
int64_t t = 0;
int64_t limit;
if (st->time_base.den > 0)
t = av_rescale_q(sti->info->codec_info_duration, st->time_base, AV_TIME_BASE_Q);
if (st->avg_frame_rate.num > 0)
t = FFMAX(t, av_rescale_q(sti->codec_info_nb_frames, av_inv_q(st->avg_frame_rate), AV_TIME_BASE_Q));
if ( t == 0
&& sti->codec_info_nb_frames > 30
&& sti->info->fps_first_dts != AV_NOPTS_VALUE
&& sti->info->fps_last_dts != AV_NOPTS_VALUE) {
int64_t dur = av_sat_sub64(sti->info->fps_last_dts, sti->info->fps_first_dts);
t = FFMAX(t, av_rescale_q(dur, st->time_base, AV_TIME_BASE_Q));
}
if (analyzed_all_streams) limit = max_analyze_duration;
else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) limit = max_subtitle_analyze_duration;
else limit = max_stream_analyze_duration;
if (t >= limit) {
av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds st:%d\n",
limit,
t, pkt->stream_index);
if (ic->flags & AVFMT_FLAG_NOBUFFER)
av_packet_unref(pkt1);
break;
}
if (pkt->duration > 0) {
if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE && pkt->pts != AV_NOPTS_VALUE && st->start_time != AV_NOPTS_VALUE && pkt->pts >= st->start_time
&& (uint64_t)pkt->pts - st->start_time < INT64_MAX
) {
sti->info->codec_info_duration = FFMIN(pkt->pts - st->start_time, sti->info->codec_info_duration + pkt->duration);
} else
sti->info->codec_info_duration += pkt->duration;
sti->info->codec_info_duration_fields += sti->parser && sti->need_parsing && avctx->ticks_per_frame == 2
? sti->parser->repeat_pict + 1 : 2;
}
}
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
#if FF_API_R_FRAME_RATE
ff_rfps_add_frame(ic, st, pkt->dts);
#endif
if (pkt->dts != pkt->pts && pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE)
sti->info->frame_delay_evidence = 1;
}
if (!sti->avctx->extradata) {
ret = extract_extradata(si, st, pkt);
if (ret < 0)
goto unref_then_goto_end;
}
/* If still no information, we try to open the codec and to
* decompress the frame. We try to avoid that in most cases as
* it takes longer and uses more memory. For MPEG-4, we need to
* decompress for QuickTime.
*
* If AV_CODEC_CAP_CHANNEL_CONF is set this will force decoding of at
* least one frame of codec data, this makes sure the codec initializes
* the channel configuration and does not only trust the values from
* the container. */
try_decode_frame(ic, st, pkt,
(options && i < orig_nb_streams) ? &options[i] : NULL);
if (ic->flags & AVFMT_FLAG_NOBUFFER)
av_packet_unref(pkt1);
sti->codec_info_nb_frames++;
count++;
}
if (eof_reached) {
for (unsigned stream_index = 0; stream_index < ic->nb_streams; stream_index++) {
AVStream *const st = ic->streams[stream_index];
AVCodecContext *const avctx = ffstream(st)->avctx;
if (!has_codec_parameters(st, NULL)) {
const AVCodec *codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
if (codec && !avctx->codec) {
AVDictionary *opts = NULL;
if (ic->codec_whitelist)
av_dict_set(&opts, "codec_whitelist", ic->codec_whitelist, 0);
if (avcodec_open2(avctx, codec, (options && stream_index < orig_nb_streams) ? &options[stream_index] : &opts) < 0)
av_log(ic, AV_LOG_WARNING,
"Failed to open codec in %s\n",__FUNCTION__);
av_dict_free(&opts);
}
}
// EOF already reached while reading the stream above.
// So continue with reoordering DTS with whatever delay we have.
if (si->packet_buffer && !has_decode_delay_been_guessed(st)) {
update_dts_from_pts(ic, stream_index, si->packet_buffer);
}
}
}
if (flush_codecs) {
AVPacket *empty_pkt = si->pkt;
int err = 0;
av_packet_unref(empty_pkt);
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
/* flush the decoders */
if (sti->info->found_decoder == 1) {
err = try_decode_frame(ic, st, empty_pkt,
(options && i < orig_nb_streams)
? &options[i] : NULL);
if (err < 0) {
av_log(ic, AV_LOG_INFO,
"decoding for stream %d failed\n", st->index);
}
}
}
}
ff_rfps_calculate(ic);
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
AVCodecContext *const avctx = sti->avctx;
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
if (avctx->codec_id == AV_CODEC_ID_RAWVIDEO && !avctx->codec_tag && !avctx->bits_per_coded_sample) {
uint32_t tag= avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
if (avpriv_find_pix_fmt(avpriv_get_raw_pix_fmt_tags(), tag) == avctx->pix_fmt)
avctx->codec_tag= tag;
}
/* estimate average framerate if not set by demuxer */
if (sti->info->codec_info_duration_fields &&
!st->avg_frame_rate.num &&
sti->info->codec_info_duration) {
int best_fps = 0;
double best_error = 0.01;
AVRational codec_frame_rate = avctx->framerate;
if (sti->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
sti->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
sti->info->codec_info_duration < 0)
continue;
av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
sti->info->codec_info_duration_fields * (int64_t) st->time_base.den,
sti->info->codec_info_duration * 2 * (int64_t) st->time_base.num, 60000);
/* Round guessed framerate to a "standard" framerate if it's
* within 1% of the original estimate. */
for (int j = 0; j < MAX_STD_TIMEBASES; j++) {
AVRational std_fps = { get_std_framerate(j), 12 * 1001 };
double error = fabs(av_q2d(st->avg_frame_rate) /
av_q2d(std_fps) - 1);
if (error < best_error) {
best_error = error;
best_fps = std_fps.num;
}
if (si->prefer_codec_framerate && codec_frame_rate.num > 0 && codec_frame_rate.den > 0) {
error = fabs(av_q2d(codec_frame_rate) /
av_q2d(std_fps) - 1);
if (error < best_error) {
best_error = error;
best_fps = std_fps.num;
}
}
}
if (best_fps)
av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
best_fps, 12 * 1001, INT_MAX);
}
if (!st->r_frame_rate.num) {
if ( avctx->time_base.den * (int64_t) st->time_base.num
<= avctx->time_base.num * (uint64_t)avctx->ticks_per_frame * st->time_base.den) {
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
avctx->time_base.den, (int64_t)avctx->time_base.num * avctx->ticks_per_frame, INT_MAX);
} else {
st->r_frame_rate.num = st->time_base.den;
st->r_frame_rate.den = st->time_base.num;
}
}
if (sti->display_aspect_ratio.num && sti->display_aspect_ratio.den) {
AVRational hw_ratio = { avctx->height, avctx->width };
st->sample_aspect_ratio = av_mul_q(sti->display_aspect_ratio,
hw_ratio);
}
} else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
if (!avctx->bits_per_coded_sample)
avctx->bits_per_coded_sample =
av_get_bits_per_sample(avctx->codec_id);
// set stream disposition based on audio service type
switch (avctx->audio_service_type) {
case AV_AUDIO_SERVICE_TYPE_EFFECTS:
st->disposition = AV_DISPOSITION_CLEAN_EFFECTS;
break;
case AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED:
st->disposition = AV_DISPOSITION_VISUAL_IMPAIRED;
break;
case AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED:
st->disposition = AV_DISPOSITION_HEARING_IMPAIRED;
break;
case AV_AUDIO_SERVICE_TYPE_COMMENTARY:
st->disposition = AV_DISPOSITION_COMMENT;
break;
case AV_AUDIO_SERVICE_TYPE_KARAOKE:
st->disposition = AV_DISPOSITION_KARAOKE;
break;
}
}
}
if (probesize)
estimate_timings(ic, old_offset);
av_opt_set_int(ic, "skip_clear", 0, AV_OPT_SEARCH_CHILDREN);
if (ret >= 0 && ic->nb_streams)
/* We could not have all the codec parameters before EOF. */
ret = -1;
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
const char *errmsg;
/* if no packet was ever seen, update context now for has_codec_parameters */
if (!sti->avctx_inited) {
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
st->codecpar->format == AV_SAMPLE_FMT_NONE)
st->codecpar->format = sti->avctx->sample_fmt;
ret = avcodec_parameters_to_context(sti->avctx, st->codecpar);
if (ret < 0)
goto find_stream_info_err;
}
if (!has_codec_parameters(st, &errmsg)) {
char buf[256];
avcodec_string(buf, sizeof(buf), sti->avctx, 0);
av_log(ic, AV_LOG_WARNING,
"Could not find codec parameters for stream %d (%s): %s\n"
"Consider increasing the value for the 'analyzeduration' (%"PRId64") and 'probesize' (%"PRId64") options\n",
i, buf, errmsg, ic->max_analyze_duration, ic->probesize);
} else {
ret = 0;
}
}
ret = compute_chapters_end(ic);
if (ret < 0)
goto find_stream_info_err;
/* update the stream parameters from the internal codec contexts */
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
if (sti->avctx_inited) {
ret = avcodec_parameters_from_context(st->codecpar, sti->avctx);
if (ret < 0)
goto find_stream_info_err;
ret = add_coded_side_data(st, sti->avctx);
if (ret < 0)
goto find_stream_info_err;
}
sti->avctx_inited = 0;
}
find_stream_info_err:
for (unsigned i = 0; i < ic->nb_streams; i++) {
AVStream *const st = ic->streams[i];
FFStream *const sti = ffstream(st);
if (sti->info) {
av_freep(&sti->info->duration_error);
av_freep(&sti->info);
}
avcodec_close(sti->avctx);
av_bsf_free(&sti->extract_extradata.bsf);
}
if (ic->pb) {
FFIOContext *const ctx = ffiocontext(ic->pb);
av_log(ic, AV_LOG_DEBUG, "After avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d frames:%d\n",
avio_tell(ic->pb), ctx->bytes_read, ctx->seek_count, count);
}
return ret;
unref_then_goto_end:
av_packet_unref(pkt1);
goto find_stream_info_err;
}
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