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FFmpeg/libavformat/demux.c

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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_components.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/avcodec.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 "demux.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;
}
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
if (st->codecpar->ch_layout.nb_channels &&
!st->codecpar->channels) {
st->codecpar->channels = st->codecpar->ch_layout.nb_channels;
st->codecpar->channel_layout = st->codecpar->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
st->codecpar->ch_layout.u.mask : 0;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
/* 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 (;;) {
PacketListEntry *pktl = si->raw_packet_buffer.head;
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, 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,
pkt, NULL, 0);
if (err < 0) {
av_packet_unref(pkt);
return err;
}
pkt1 = &si->raw_packet_buffer.tail->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 PacketListEntry *get_next_pkt(AVFormatContext *s, AVStream *st,
PacketListEntry *pktl)
{
FFFormatContext *const si = ffformatcontext(s);
if (pktl->next)
return pktl->next;
if (pktl == si->packet_buffer.tail)
return si->parse_queue.head;
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,
PacketListEntry *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);
PacketListEntry *pktl = si->packet_buffer.head ? si->packet_buffer.head : si->parse_queue.head;
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 (PacketListEntry *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);
PacketListEntry *pktl = si->packet_buffer.head ? si->packet_buffer.head : si->parse_queue.head;
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.head ? si->packet_buffer.head : si->parse_queue.head;
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.head || si->parse_queue.head))
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,
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.head) {
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;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
st->codecpar->channels = sti->avctx->ch_layout.nb_channels;
st->codecpar->channel_layout = sti->avctx->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
sti->avctx->ch_layout.u.mask : 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
ret = av_channel_layout_copy(&st->codecpar->ch_layout, &sti->avctx->ch_layout);
if (ret < 0)
return ret;
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.head)
ret = avpriv_packet_list_get(&si->parse_queue, 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);
int64_t 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;
sti->skip_samples = FFMAX(0, sti->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 %u / discard %u\n",
(unsigned)sti->skip_samples, (unsigned)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;
}
}
if (!si->metafree) {
int metaret = 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);
}
si->metafree = metaret == AVERROR_OPTION_NOT_FOUND;
}
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.head
? avpriv_packet_list_get(&si->packet_buffer, pkt)
: read_frame_internal(s, pkt);
if (ret < 0)
return ret;
goto return_packet;
}
for (;;) {
PacketListEntry *pktl = si->packet_buffer.head;
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.head;
}
/* 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, 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,
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 && (uint64_t)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->ch_layout.nb_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 *pkt, 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;
int do_skip_frame = 0;
enum AVDiscard skip_frame;
int pkt_to_send = pkt->size > 0;
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_to_send || (!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_to_send = 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_to_send = 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(AVFormatContext *ic, AVStream *st)
{
FFStream *const sti = ffstream(st);
AVCodecContext *c = sti->avctx;
AVRational time_base = c->framerate.num ? av_inv_q(av_mul_q(c->framerate,
(AVRational){c->ticks_per_frame, 1}))
/* NOHEADER check added to not break existing behavior */
: (((ic->ctx_flags & AVFMTCTX_NOHEADER) ||
st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) ? (AVRational){0, 1}
: st->time_base);
if (time_base.den >= 101LL * time_base.num ||
time_base.den < 5LL * 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);
FFStreamInfo *info = sti->info;
int64_t last = 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 (!info->duration_error)
info->duration_error = av_mallocz(sizeof(info->duration_error[0])*2);
if (!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 (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;
info->duration_error[j][0][i] += error;
info->duration_error[j][1][i] += error*error;
}
}
}
if (info->rfps_duration_sum <= INT64_MAX - duration) {
info->duration_count++;
info->rfps_duration_sum += duration;
}
if (info->duration_count % 10 == 0) {
int n = info->duration_count;
for (int i = 0; i < MAX_STD_TIMEBASES; i++) {
if (info->duration_error[0][1][i] < 1e10) {
double a0 = info->duration_error[0][0][i] / n;
double error0 = info->duration_error[0][1][i] / n - a0*a0;
double a1 = info->duration_error[1][0][i] / n;
double error1 = info->duration_error[1][1][i] / n - a1*a1;
if (error0 > 0.04 && error1 > 0.04) {
info->duration_error[0][1][i] = 2e10;
info->duration_error[1][1][i] = 2e10;
}
}
}
}
// ignore the first 4 values, they might have some random jitter
if (info->duration_count > 3 && is_relative(ts) == is_relative(last))
info->duration_gcd = av_gcd(info->duration_gcd, duration);
}
if (ts != AV_NOPTS_VALUE)
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(ic, st) && 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(ic, st)) {
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;
/* 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(ic, st))
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->need_parsing == AVSTREAM_PARSE_FULL_RAW) &&
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,
pkt1, NULL, 0);
if (ret < 0)
goto unref_then_goto_end;
pkt = &si->packet_buffer.tail->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.head && !has_decode_delay_been_guessed(st)) {
update_dts_from_pts(ic, stream_index, si->packet_buffer.head);
}
}
}
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_pix_fmt_find(PIX_FMT_LIST_RAW, 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) {
AVRational time_base = avctx->framerate.num ? av_inv_q(av_mul_q(avctx->framerate,
(AVRational){avctx->ticks_per_frame, 1}))
/* NOHEADER check added to not break existing behavior */
: ((ic->ctx_flags & AVFMTCTX_NOHEADER) ? (AVRational){0, 1}
: st->time_base);
if ( time_base.den * (int64_t) st->time_base.num
<= 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,
time_base.den, (int64_t)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);
// FIXME: avcodec_close() frees AVOption settable fields which includes ch_layout,
// so we need to restore it.
av_channel_layout_copy(&sti->avctx->ch_layout, &st->codecpar->ch_layout);
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;
}