/
demux.c
2979 lines (2630 loc) · 113 KB
/
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/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;
}