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FFmpeg/libavformat/mux.c
Marton Balint d7a0071a44 avformat/mux: add proper support for full N:M bitstream filtering 
Previously only 1:1 bitstream filters were supported, the end of the stream was
not signalled to the bitstream filters and time base changes were ignored.

This change also allows muxers to set up bitstream filters regardless of the
autobsf flag during write_header instead of during check_bitstream and those
bitstream filters will always be executed.

Signed-off-by: Marton Balint <cus@passwd.hu>
2020-05-07 22:49:50 +02:00

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/*
* muxing functions for use within FFmpeg
* 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 "avformat.h"
#include "internal.h"
#include "libavcodec/internal.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timestamp.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
/**
* @file
* muxing functions for use within libavformat
*/
/* fraction handling */
/**
* f = val + (num / den) + 0.5.
*
* 'num' is normalized so that it is such as 0 <= num < den.
*
* @param f fractional number
* @param val integer value
* @param num must be >= 0
* @param den must be >= 1
*/
static void frac_init(FFFrac *f, int64_t val, int64_t num, int64_t den)
{
num += (den >> 1);
if (num >= den) {
val += num / den;
num = num % den;
}
f->val = val;
f->num = num;
f->den = den;
}
/**
* Fractional addition to f: f = f + (incr / f->den).
*
* @param f fractional number
* @param incr increment, can be positive or negative
*/
static void frac_add(FFFrac *f, int64_t incr)
{
int64_t num, den;
num = f->num + incr;
den = f->den;
if (num < 0) {
f->val += num / den;
num = num % den;
if (num < 0) {
num += den;
f->val--;
}
} else if (num >= den) {
f->val += num / den;
num = num % den;
}
f->num = num;
}
AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision)
{
AVRational q;
int j;
q = st->time_base;
for (j=2; j<14; j+= 1+(j>2))
while (q.den / q.num < min_precision && q.num % j == 0)
q.num /= j;
while (q.den / q.num < min_precision && q.den < (1<<24))
q.den <<= 1;
return q;
}
enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st)
{
AVCodecParameters *par = st->codecpar;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(par->format);
if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED)
return par->chroma_location;
if (pix_desc) {
if (pix_desc->log2_chroma_h == 0) {
return AVCHROMA_LOC_TOPLEFT;
} else if (pix_desc->log2_chroma_w == 1 && pix_desc->log2_chroma_h == 1) {
if (par->field_order == AV_FIELD_UNKNOWN || par->field_order == AV_FIELD_PROGRESSIVE) {
switch (par->codec_id) {
case AV_CODEC_ID_MJPEG:
case AV_CODEC_ID_MPEG1VIDEO: return AVCHROMA_LOC_CENTER;
}
}
if (par->field_order == AV_FIELD_UNKNOWN || par->field_order != AV_FIELD_PROGRESSIVE) {
switch (par->codec_id) {
case AV_CODEC_ID_MPEG2VIDEO: return AVCHROMA_LOC_LEFT;
}
}
}
}
return AVCHROMA_LOC_UNSPECIFIED;
}
int avformat_alloc_output_context2(AVFormatContext **avctx, ff_const59 AVOutputFormat *oformat,
const char *format, const char *filename)
{
AVFormatContext *s = avformat_alloc_context();
int ret = 0;
*avctx = NULL;
if (!s)
goto nomem;
if (!oformat) {
if (format) {
oformat = av_guess_format(format, NULL, NULL);
if (!oformat) {
av_log(s, AV_LOG_ERROR, "Requested output format '%s' is not a suitable output format\n", format);
ret = AVERROR(EINVAL);
goto error;
}
} else {
oformat = av_guess_format(NULL, filename, NULL);
if (!oformat) {
ret = AVERROR(EINVAL);
av_log(s, AV_LOG_ERROR, "Unable to find a suitable output format for '%s'\n",
filename);
goto error;
}
}
}
s->oformat = oformat;
if (s->oformat->priv_data_size > 0) {
s->priv_data = av_mallocz(s->oformat->priv_data_size);
if (!s->priv_data)
goto nomem;
if (s->oformat->priv_class) {
*(const AVClass**)s->priv_data= s->oformat->priv_class;
av_opt_set_defaults(s->priv_data);
}
} else
s->priv_data = NULL;
if (filename) {
#if FF_API_FORMAT_FILENAME
FF_DISABLE_DEPRECATION_WARNINGS
av_strlcpy(s->filename, filename, sizeof(s->filename));
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (!(s->url = av_strdup(filename)))
goto nomem;
}
*avctx = s;
return 0;
nomem:
av_log(s, AV_LOG_ERROR, "Out of memory\n");
ret = AVERROR(ENOMEM);
error:
avformat_free_context(s);
return ret;
}
static int validate_codec_tag(AVFormatContext *s, AVStream *st)
{
const AVCodecTag *avctag;
int n;
enum AVCodecID id = AV_CODEC_ID_NONE;
int64_t tag = -1;
/**
* Check that tag + id is in the table
* If neither is in the table -> OK
* If tag is in the table with another id -> FAIL
* If id is in the table with another tag -> FAIL unless strict < normal
*/
for (n = 0; s->oformat->codec_tag[n]; n++) {
avctag = s->oformat->codec_tag[n];
while (avctag->id != AV_CODEC_ID_NONE) {
if (avpriv_toupper4(avctag->tag) == avpriv_toupper4(st->codecpar->codec_tag)) {
id = avctag->id;
if (id == st->codecpar->codec_id)
return 1;
}
if (avctag->id == st->codecpar->codec_id)
tag = avctag->tag;
avctag++;
}
}
if (id != AV_CODEC_ID_NONE)
return 0;
if (tag >= 0 && (s->strict_std_compliance >= FF_COMPLIANCE_NORMAL))
return 0;
return 1;
}
static int init_muxer(AVFormatContext *s, AVDictionary **options)
{
int ret = 0, i;
AVStream *st;
AVDictionary *tmp = NULL;
AVCodecParameters *par = NULL;
const AVOutputFormat *of = s->oformat;
const AVCodecDescriptor *desc;
AVDictionaryEntry *e;
if (options)
av_dict_copy(&tmp, *options, 0);
if ((ret = av_opt_set_dict(s, &tmp)) < 0)
goto fail;
if (s->priv_data && s->oformat->priv_class && *(const AVClass**)s->priv_data==s->oformat->priv_class &&
(ret = av_opt_set_dict2(s->priv_data, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)
goto fail;
#if FF_API_FORMAT_FILENAME
FF_DISABLE_DEPRECATION_WARNINGS
if (!s->url && !(s->url = av_strdup(s->filename))) {
FF_ENABLE_DEPRECATION_WARNINGS
#else
if (!s->url && !(s->url = av_strdup(""))) {
#endif
ret = AVERROR(ENOMEM);
goto fail;
}
#if FF_API_LAVF_AVCTX
FF_DISABLE_DEPRECATION_WARNINGS
if (s->nb_streams && s->streams[0]->codec->flags & AV_CODEC_FLAG_BITEXACT) {
if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
av_log(s, AV_LOG_WARNING,
"The AVFormatContext is not in set to bitexact mode, only "
"the AVCodecContext. If this is not intended, set "
"AVFormatContext.flags |= AVFMT_FLAG_BITEXACT.\n");
}
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
// some sanity checks
if (s->nb_streams == 0 && !(of->flags & AVFMT_NOSTREAMS)) {
av_log(s, AV_LOG_ERROR, "No streams to mux were specified\n");
ret = AVERROR(EINVAL);
goto fail;
}
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
par = st->codecpar;
#if FF_API_LAVF_AVCTX
FF_DISABLE_DEPRECATION_WARNINGS
if (st->codecpar->codec_type == AVMEDIA_TYPE_UNKNOWN &&
st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
av_log(s, AV_LOG_WARNING, "Using AVStream.codec to pass codec "
"parameters to muxers is deprecated, use AVStream.codecpar "
"instead.\n");
ret = avcodec_parameters_from_context(st->codecpar, st->codec);
if (ret < 0)
goto fail;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (!st->time_base.num) {
/* fall back on the default timebase values */
if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->sample_rate)
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
else
avpriv_set_pts_info(st, 33, 1, 90000);
}
switch (par->codec_type) {
case AVMEDIA_TYPE_AUDIO:
if (par->sample_rate <= 0) {
av_log(s, AV_LOG_ERROR, "sample rate not set\n");
ret = AVERROR(EINVAL);
goto fail;
}
if (!par->block_align)
par->block_align = par->channels *
av_get_bits_per_sample(par->codec_id) >> 3;
break;
case AVMEDIA_TYPE_VIDEO:
if ((par->width <= 0 || par->height <= 0) &&
!(of->flags & AVFMT_NODIMENSIONS)) {
av_log(s, AV_LOG_ERROR, "dimensions not set\n");
ret = AVERROR(EINVAL);
goto fail;
}
if (av_cmp_q(st->sample_aspect_ratio, par->sample_aspect_ratio)
&& fabs(av_q2d(st->sample_aspect_ratio) - av_q2d(par->sample_aspect_ratio)) > 0.004*av_q2d(st->sample_aspect_ratio)
) {
if (st->sample_aspect_ratio.num != 0 &&
st->sample_aspect_ratio.den != 0 &&
par->sample_aspect_ratio.num != 0 &&
par->sample_aspect_ratio.den != 0) {
av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between muxer "
"(%d/%d) and encoder layer (%d/%d)\n",
st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
par->sample_aspect_ratio.num,
par->sample_aspect_ratio.den);
ret = AVERROR(EINVAL);
goto fail;
}
}
break;
}
desc = avcodec_descriptor_get(par->codec_id);
if (desc && desc->props & AV_CODEC_PROP_REORDER)
st->internal->reorder = 1;
st->internal->is_intra_only = ff_is_intra_only(par->codec_id);
if (of->codec_tag) {
if ( par->codec_tag
&& par->codec_id == AV_CODEC_ID_RAWVIDEO
&& ( av_codec_get_tag(of->codec_tag, par->codec_id) == 0
|| av_codec_get_tag(of->codec_tag, par->codec_id) == MKTAG('r', 'a', 'w', ' '))
&& !validate_codec_tag(s, st)) {
// the current rawvideo encoding system ends up setting
// the wrong codec_tag for avi/mov, we override it here
par->codec_tag = 0;
}
if (par->codec_tag) {
if (!validate_codec_tag(s, st)) {
const uint32_t otag = av_codec_get_tag(s->oformat->codec_tag, par->codec_id);
av_log(s, AV_LOG_ERROR,
"Tag %s incompatible with output codec id '%d' (%s)\n",
av_fourcc2str(par->codec_tag), par->codec_id, av_fourcc2str(otag));
ret = AVERROR_INVALIDDATA;
goto fail;
}
} else
par->codec_tag = av_codec_get_tag(of->codec_tag, par->codec_id);
}
if (par->codec_type != AVMEDIA_TYPE_ATTACHMENT)
s->internal->nb_interleaved_streams++;
}
if (!s->priv_data && of->priv_data_size > 0) {
s->priv_data = av_mallocz(of->priv_data_size);
if (!s->priv_data) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (of->priv_class) {
*(const AVClass **)s->priv_data = of->priv_class;
av_opt_set_defaults(s->priv_data);
if ((ret = av_opt_set_dict2(s->priv_data, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)
goto fail;
}
}
/* set muxer identification string */
if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
} else {
av_dict_set(&s->metadata, "encoder", NULL, 0);
}
for (e = NULL; e = av_dict_get(s->metadata, "encoder-", e, AV_DICT_IGNORE_SUFFIX); ) {
av_dict_set(&s->metadata, e->key, NULL, 0);
}
if (options) {
av_dict_free(options);
*options = tmp;
}
if (s->oformat->init) {
if ((ret = s->oformat->init(s)) < 0) {
if (s->oformat->deinit)
s->oformat->deinit(s);
return ret;
}
return ret == 0;
}
return 0;
fail:
av_dict_free(&tmp);
return ret;
}
static int init_pts(AVFormatContext *s)
{
int i;
AVStream *st;
/* init PTS generation */
for (i = 0; i < s->nb_streams; i++) {
int64_t den = AV_NOPTS_VALUE;
st = s->streams[i];
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_AUDIO:
den = (int64_t)st->time_base.num * st->codecpar->sample_rate;
break;
case AVMEDIA_TYPE_VIDEO:
den = (int64_t)st->time_base.num * st->time_base.den;
break;
default:
break;
}
if (!st->internal->priv_pts)
st->internal->priv_pts = av_mallocz(sizeof(*st->internal->priv_pts));
if (!st->internal->priv_pts)
return AVERROR(ENOMEM);
if (den != AV_NOPTS_VALUE) {
if (den <= 0)
return AVERROR_INVALIDDATA;
frac_init(st->internal->priv_pts, 0, 0, den);
}
}
if (s->avoid_negative_ts < 0) {
av_assert2(s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_AUTO);
if (s->oformat->flags & (AVFMT_TS_NEGATIVE | AVFMT_NOTIMESTAMPS)) {
s->avoid_negative_ts = 0;
} else
s->avoid_negative_ts = AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE;
}
return 0;
}
static void flush_if_needed(AVFormatContext *s)
{
if (s->pb && s->pb->error >= 0) {
if (s->flush_packets == 1 || s->flags & AVFMT_FLAG_FLUSH_PACKETS)
avio_flush(s->pb);
else if (s->flush_packets && !(s->oformat->flags & AVFMT_NOFILE))
avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
}
}
static void deinit_muxer(AVFormatContext *s)
{
if (s->oformat && s->oformat->deinit && s->internal->initialized)
s->oformat->deinit(s);
s->internal->initialized =
s->internal->streams_initialized = 0;
}
int avformat_init_output(AVFormatContext *s, AVDictionary **options)
{
int ret = 0;
if ((ret = init_muxer(s, options)) < 0)
return ret;
s->internal->initialized = 1;
s->internal->streams_initialized = ret;
if (s->oformat->init && ret) {
if ((ret = init_pts(s)) < 0)
return ret;
return AVSTREAM_INIT_IN_INIT_OUTPUT;
}
return AVSTREAM_INIT_IN_WRITE_HEADER;
}
int avformat_write_header(AVFormatContext *s, AVDictionary **options)
{
int ret = 0;
int already_initialized = s->internal->initialized;
int streams_already_initialized = s->internal->streams_initialized;
if (!already_initialized)
if ((ret = avformat_init_output(s, options)) < 0)
return ret;
if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_HEADER);
if (s->oformat->write_header) {
ret = s->oformat->write_header(s);
if (ret >= 0 && s->pb && s->pb->error < 0)
ret = s->pb->error;
if (ret < 0)
goto fail;
flush_if_needed(s);
}
if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_UNKNOWN);
if (!s->internal->streams_initialized) {
if ((ret = init_pts(s)) < 0)
goto fail;
}
return streams_already_initialized;
fail:
deinit_muxer(s);
return ret;
}
#define AV_PKT_FLAG_UNCODED_FRAME 0x2000
#if FF_API_COMPUTE_PKT_FIELDS2 && FF_API_LAVF_AVCTX
FF_DISABLE_DEPRECATION_WARNINGS
//FIXME merge with compute_pkt_fields
static int compute_muxer_pkt_fields(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
int delay = FFMAX(st->codecpar->video_delay, st->internal->avctx->max_b_frames > 0);
int num, den, i;
int frame_size;
if (!s->internal->missing_ts_warning &&
!(s->oformat->flags & AVFMT_NOTIMESTAMPS) &&
(!(st->disposition & AV_DISPOSITION_ATTACHED_PIC) || (st->disposition & AV_DISPOSITION_TIMED_THUMBNAILS)) &&
(pkt->pts == AV_NOPTS_VALUE || pkt->dts == AV_NOPTS_VALUE)) {
av_log(s, AV_LOG_WARNING,
"Timestamps are unset in a packet for stream %d. "
"This is deprecated and will stop working in the future. "
"Fix your code to set the timestamps properly\n", st->index);
s->internal->missing_ts_warning = 1;
}
if (s->debug & FF_FDEBUG_TS)
av_log(s, AV_LOG_DEBUG, "compute_muxer_pkt_fields: pts:%s dts:%s cur_dts:%s b:%d size:%d st:%d\n",
av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), delay, pkt->size, pkt->stream_index);
if (pkt->duration < 0 && st->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
av_log(s, AV_LOG_WARNING, "Packet with invalid duration %"PRId64" in stream %d\n",
pkt->duration, pkt->stream_index);
pkt->duration = 0;
}
/* duration field */
if (pkt->duration == 0) {
ff_compute_frame_duration(s, &num, &den, st, NULL, pkt);
if (den && num) {
pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);
}
}
if (pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE && delay == 0)
pkt->pts = pkt->dts;
//XXX/FIXME this is a temporary hack until all encoders output pts
if ((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay) {
static int warned;
if (!warned) {
av_log(s, AV_LOG_WARNING, "Encoder did not produce proper pts, making some up.\n");
warned = 1;
}
pkt->dts =
// pkt->pts= st->cur_dts;
pkt->pts = st->internal->priv_pts->val;
}
//calculate dts from pts
if (pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
st->pts_buffer[0] = pkt->pts;
for (i = 1; i < delay + 1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)
st->pts_buffer[i] = pkt->pts + (i - delay - 1) * pkt->duration;
for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
pkt->dts = st->pts_buffer[0];
}
if (st->cur_dts && st->cur_dts != AV_NOPTS_VALUE &&
((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&
st->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE &&
st->codecpar->codec_type != AVMEDIA_TYPE_DATA &&
st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {
av_log(s, AV_LOG_ERROR,
"Application provided invalid, non monotonically increasing dts to muxer in stream %d: %s >= %s\n",
st->index, av_ts2str(st->cur_dts), av_ts2str(pkt->dts));
return AVERROR(EINVAL);
}
if (pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts) {
av_log(s, AV_LOG_ERROR,
"pts (%s) < dts (%s) in stream %d\n",
av_ts2str(pkt->pts), av_ts2str(pkt->dts),
st->index);
return AVERROR(EINVAL);
}
if (s->debug & FF_FDEBUG_TS)
av_log(s, AV_LOG_DEBUG, "av_write_frame: pts2:%s dts2:%s\n",
av_ts2str(pkt->pts), av_ts2str(pkt->dts));
st->cur_dts = pkt->dts;
st->internal->priv_pts->val = pkt->dts;
/* update pts */
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_AUDIO:
frame_size = (pkt->flags & AV_PKT_FLAG_UNCODED_FRAME) ?
(*(AVFrame **)pkt->data)->nb_samples :
av_get_audio_frame_duration(st->codec, pkt->size);
/* HACK/FIXME, we skip the initial 0 size packets as they are most
* likely equal to the encoder delay, but it would be better if we
* had the real timestamps from the encoder */
if (frame_size >= 0 && (pkt->size || st->internal->priv_pts->num != st->internal->priv_pts->den >> 1 || st->internal->priv_pts->val)) {
frac_add(st->internal->priv_pts, (int64_t)st->time_base.den * frame_size);
}
break;
case AVMEDIA_TYPE_VIDEO:
frac_add(st->internal->priv_pts, (int64_t)st->time_base.den * st->time_base.num);
break;
}
return 0;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
/**
* Shift timestamps and call muxer; the original pts/dts are not kept.
*
* FIXME: this function should NEVER get undefined pts/dts beside when the
* AVFMT_NOTIMESTAMPS is set.
* Those additional safety checks should be dropped once the correct checks
* are set in the callers.
*/
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret;
// If the timestamp offsetting below is adjusted, adjust
// ff_interleaved_peek similarly.
if (s->output_ts_offset) {
AVStream *st = s->streams[pkt->stream_index];
int64_t offset = av_rescale_q(s->output_ts_offset, AV_TIME_BASE_Q, st->time_base);
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += offset;
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts += offset;
}
if (s->avoid_negative_ts > 0) {
AVStream *st = s->streams[pkt->stream_index];
int64_t offset = st->mux_ts_offset;
int64_t ts = s->internal->avoid_negative_ts_use_pts ? pkt->pts : pkt->dts;
if (s->internal->offset == AV_NOPTS_VALUE && ts != AV_NOPTS_VALUE &&
(ts < 0 || s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO)) {
s->internal->offset = -ts;
s->internal->offset_timebase = st->time_base;
}
if (s->internal->offset != AV_NOPTS_VALUE && !offset) {
offset = st->mux_ts_offset =
av_rescale_q_rnd(s->internal->offset,
s->internal->offset_timebase,
st->time_base,
AV_ROUND_UP);
}
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += offset;
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts += offset;
if (s->internal->avoid_negative_ts_use_pts) {
if (pkt->pts != AV_NOPTS_VALUE && pkt->pts < 0) {
av_log(s, AV_LOG_WARNING, "failed to avoid negative "
"pts %s in stream %d.\n"
"Try -avoid_negative_ts 1 as a possible workaround.\n",
av_ts2str(pkt->pts),
pkt->stream_index
);
}
} else {
av_assert2(pkt->dts == AV_NOPTS_VALUE || pkt->dts >= 0 || s->max_interleave_delta > 0);
if (pkt->dts != AV_NOPTS_VALUE && pkt->dts < 0) {
av_log(s, AV_LOG_WARNING,
"Packets poorly interleaved, failed to avoid negative "
"timestamp %s in stream %d.\n"
"Try -max_interleave_delta 0 as a possible workaround.\n",
av_ts2str(pkt->dts),
pkt->stream_index
);
}
}
}
if ((pkt->flags & AV_PKT_FLAG_UNCODED_FRAME)) {
AVFrame **frame = (AVFrame **)pkt->data;
av_assert0(pkt->size == sizeof(*frame));
ret = s->oformat->write_uncoded_frame(s, pkt->stream_index, frame, 0);
} else {
ret = s->oformat->write_packet(s, pkt);
}
if (s->pb && ret >= 0) {
flush_if_needed(s);
if (s->pb->error < 0)
ret = s->pb->error;
}
if (ret >= 0)
s->streams[pkt->stream_index]->nb_frames++;
return ret;
}
static int check_packet(AVFormatContext *s, AVPacket *pkt)
{
if (pkt->stream_index < 0 || pkt->stream_index >= s->nb_streams) {
av_log(s, AV_LOG_ERROR, "Invalid packet stream index: %d\n",
pkt->stream_index);
return AVERROR(EINVAL);
}
if (s->streams[pkt->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
av_log(s, AV_LOG_ERROR, "Received a packet for an attachment stream.\n");
return AVERROR(EINVAL);
}
return 0;
}
static int prepare_input_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret;
AVStream *st = s->streams[pkt->stream_index];
ret = check_packet(s, pkt);
if (ret < 0)
return ret;
#if !FF_API_COMPUTE_PKT_FIELDS2 || !FF_API_LAVF_AVCTX
/* sanitize the timestamps */
if (!(s->oformat->flags & AVFMT_NOTIMESTAMPS)) {
/* when there is no reordering (so dts is equal to pts), but
* only one of them is set, set the other as well */
if (!st->internal->reorder) {
if (pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE)
pkt->pts = pkt->dts;
if (pkt->dts == AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE)
pkt->dts = pkt->pts;
}
/* check that the timestamps are set */
if (pkt->pts == AV_NOPTS_VALUE || pkt->dts == AV_NOPTS_VALUE) {
av_log(s, AV_LOG_ERROR,
"Timestamps are unset in a packet for stream %d\n", st->index);
return AVERROR(EINVAL);
}
/* check that the dts are increasing (or at least non-decreasing,
* if the format allows it */
if (st->cur_dts != AV_NOPTS_VALUE &&
((!(s->oformat->flags & AVFMT_TS_NONSTRICT) && st->cur_dts >= pkt->dts) ||
st->cur_dts > pkt->dts)) {
av_log(s, AV_LOG_ERROR,
"Application provided invalid, non monotonically increasing "
"dts to muxer in stream %d: %" PRId64 " >= %" PRId64 "\n",
st->index, st->cur_dts, pkt->dts);
return AVERROR(EINVAL);
}
if (pkt->pts < pkt->dts) {
av_log(s, AV_LOG_ERROR, "pts %" PRId64 " < dts %" PRId64 " in stream %d\n",
pkt->pts, pkt->dts, st->index);
return AVERROR(EINVAL);
}
}
#endif
/* update flags */
if (st->internal->is_intra_only)
pkt->flags |= AV_PKT_FLAG_KEY;
return 0;
}
#define CHUNK_START 0x1000
int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *))
{
int ret;
AVPacketList **next_point, *this_pktl;
AVStream *st = s->streams[pkt->stream_index];
int chunked = s->max_chunk_size || s->max_chunk_duration;
this_pktl = av_malloc(sizeof(AVPacketList));
if (!this_pktl) {
av_packet_unref(pkt);
return AVERROR(ENOMEM);
}
if ((ret = av_packet_make_refcounted(pkt)) < 0) {
av_free(this_pktl);
av_packet_unref(pkt);
return ret;
}
av_packet_move_ref(&this_pktl->pkt, pkt);
pkt = &this_pktl->pkt;
if (st->last_in_packet_buffer) {
next_point = &(st->last_in_packet_buffer->next);
} else {
next_point = &s->internal->packet_buffer;
}
if (chunked) {
uint64_t max= av_rescale_q_rnd(s->max_chunk_duration, AV_TIME_BASE_Q, st->time_base, AV_ROUND_UP);
st->interleaver_chunk_size += pkt->size;
st->interleaver_chunk_duration += pkt->duration;
if ( (s->max_chunk_size && st->interleaver_chunk_size > s->max_chunk_size)
|| (max && st->interleaver_chunk_duration > max)) {
st->interleaver_chunk_size = 0;
pkt->flags |= CHUNK_START;
if (max && st->interleaver_chunk_duration > max) {
int64_t syncoffset = (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)*max/2;
int64_t syncto = av_rescale(pkt->dts + syncoffset, 1, max)*max - syncoffset;
st->interleaver_chunk_duration += (pkt->dts - syncto)/8 - max;
} else
st->interleaver_chunk_duration = 0;
}
}
if (*next_point) {
if (chunked && !(pkt->flags & CHUNK_START))
goto next_non_null;
if (compare(s, &s->internal->packet_buffer_end->pkt, pkt)) {
while ( *next_point
&& ((chunked && !((*next_point)->pkt.flags&CHUNK_START))
|| !compare(s, &(*next_point)->pkt, pkt)))
next_point = &(*next_point)->next;
if (*next_point)
goto next_non_null;
} else {
next_point = &(s->internal->packet_buffer_end->next);
}
}
av_assert1(!*next_point);
s->internal->packet_buffer_end = this_pktl;
next_non_null:
this_pktl->next = *next_point;
st->last_in_packet_buffer = *next_point = this_pktl;
return 0;
}
static int interleave_compare_dts(AVFormatContext *s, const AVPacket *next,
const AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
AVStream *st2 = s->streams[next->stream_index];
int comp = av_compare_ts(next->dts, st2->time_base, pkt->dts,
st->time_base);
if (s->audio_preload) {
int preload = st ->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
int preload2 = st2->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
if (preload != preload2) {
int64_t ts, ts2;
preload *= s->audio_preload;
preload2 *= s->audio_preload;
ts = av_rescale_q(pkt ->dts, st ->time_base, AV_TIME_BASE_Q) - preload;
ts2= av_rescale_q(next->dts, st2->time_base, AV_TIME_BASE_Q) - preload2;
if (ts == ts2) {
ts = ((uint64_t)pkt ->dts*st ->time_base.num*AV_TIME_BASE - (uint64_t)preload *st ->time_base.den)*st2->time_base.den
- ((uint64_t)next->dts*st2->time_base.num*AV_TIME_BASE - (uint64_t)preload2*st2->time_base.den)*st ->time_base.den;
ts2 = 0;
}
comp = (ts2 > ts) - (ts2 < ts);
}
}
if (comp == 0)
return pkt->stream_index < next->stream_index;
return comp > 0;
}
int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
AVPacket *pkt, int flush)
{
AVPacketList *pktl;
int stream_count = 0;
int noninterleaved_count = 0;
int i, ret;
int eof = flush;
if (pkt) {
if ((ret = ff_interleave_add_packet(s, pkt, interleave_compare_dts)) < 0)
return ret;
}
for (i = 0; i < s->nb_streams; i++) {
if (s->streams[i]->last_in_packet_buffer) {
++stream_count;
} else if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT &&
s->streams[i]->codecpar->codec_id != AV_CODEC_ID_VP8 &&
s->streams[i]->codecpar->codec_id != AV_CODEC_ID_VP9) {
++noninterleaved_count;
}
}
if (s->internal->nb_interleaved_streams == stream_count)
flush = 1;
if (s->max_interleave_delta > 0 &&
s->internal->packet_buffer &&
!flush &&
s->internal->nb_interleaved_streams == stream_count+noninterleaved_count
) {
AVPacket *top_pkt = &s->internal->packet_buffer->pkt;
int64_t delta_dts = INT64_MIN;
int64_t top_dts = av_rescale_q(top_pkt->dts,
s->streams[top_pkt->stream_index]->time_base,
AV_TIME_BASE_Q);
for (i = 0; i < s->nb_streams; i++) {
int64_t last_dts;
const AVPacketList *last = s->streams[i]->last_in_packet_buffer;
if (!last)
continue;
last_dts = av_rescale_q(last->pkt.dts,
s->streams[i]->time_base,
AV_TIME_BASE_Q);
delta_dts = FFMAX(delta_dts, last_dts - top_dts);
}
if (delta_dts > s->max_interleave_delta) {
av_log(s, AV_LOG_DEBUG,
"Delay between the first packet and last packet in the "
"muxing queue is %"PRId64" > %"PRId64": forcing output\n",
delta_dts, s->max_interleave_delta);
flush = 1;
}
}
if (s->internal->packet_buffer &&
eof &&
(s->flags & AVFMT_FLAG_SHORTEST) &&
s->internal->shortest_end == AV_NOPTS_VALUE) {
AVPacket *top_pkt = &s->internal->packet_buffer->pkt;
s->internal->shortest_end = av_rescale_q(top_pkt->dts,
s->streams[top_pkt->stream_index]->time_base,
AV_TIME_BASE_Q);
}
if (s->internal->shortest_end != AV_NOPTS_VALUE) {
while (s->internal->packet_buffer) {
AVPacket *top_pkt = &s->internal->packet_buffer->pkt;
AVStream *st;
int64_t top_dts = av_rescale_q(top_pkt->dts,
s->streams[top_pkt->stream_index]->time_base,
AV_TIME_BASE_Q);
if (s->internal->shortest_end + 1 >= top_dts)
break;
pktl = s->internal->packet_buffer;
st = s->streams[pktl->pkt.stream_index];
s->internal->packet_buffer = pktl->next;
if (!s->internal->packet_buffer)
s->internal->packet_buffer_end = NULL;
if (st->last_in_packet_buffer == pktl)
st->last_in_packet_buffer = NULL;
av_packet_unref(&pktl->pkt);
av_freep(&pktl);
flush = 0;
}
}
if (stream_count && flush) {
AVStream *st;
pktl = s->internal->packet_buffer;
*out = pktl->pkt;
st = s->streams[out->stream_index];
s->internal->packet_buffer = pktl->next;
if (!s->internal->packet_buffer)
s->internal->packet_buffer_end = NULL;
if (st->last_in_packet_buffer == pktl)
st->last_in_packet_buffer = NULL;
av_freep(&pktl);
return 1;
} else {
return 0;
}
}
int ff_interleaved_peek(AVFormatContext *s, int stream,
AVPacket *pkt, int add_offset)
{
AVPacketList *pktl = s->internal->packet_buffer;
while (pktl) {
if (pktl->pkt.stream_index == stream) {
*pkt = pktl->pkt;
if (add_offset) {
AVStream *st = s->streams[pkt->stream_index];
int64_t offset = st->mux_ts_offset;
if (s->output_ts_offset)
offset += av_rescale_q(s->output_ts_offset, AV_TIME_BASE_Q, st->time_base);
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += offset;
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts += offset;
}
return 0;
}
pktl = pktl->next;
}
return AVERROR(ENOENT);
}
/**
* Interleave an AVPacket correctly so it can be muxed.
* @param out the interleaved packet will be output here
* @param in the input packet; will always be blank on return if not NULL
* @param flush 1 if no further packets are available as input and all
* remaining packets should be output
* @return 1 if a packet was output, 0 if no packet could be output,
* < 0 if an error occurred
*/
static int interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush)
{
if (s->oformat->interleave_packet) {
int ret = s->oformat->interleave_packet(s, out, in, flush);
if (in)
av_packet_unref(in);
return ret;
} else
return ff_interleave_packet_per_dts(s, out, in, flush);
}
static int check_bitstream(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
int ret;
if (!(s->flags & AVFMT_FLAG_AUTO_BSF))
return 1;
if (s->oformat->check_bitstream) {
if (!st->internal->bitstream_checked) {
if ((ret = s->oformat->check_bitstream(s, pkt)) < 0)
return ret;
else if (ret == 1)
st->internal->bitstream_checked = 1;
}
}
return 1;
}
static int interleaved_write_packet(AVFormatContext *s, AVPacket *pkt, int flush)
{
for (;; ) {
AVPacket opkt;
int ret = interleave_packet(s, &opkt, pkt, flush);
if (ret <= 0)
return ret;
pkt = NULL;
ret = write_packet(s, &opkt);
av_packet_unref(&opkt);
if (ret < 0)
return ret;
}
}
static int write_packet_common(AVFormatContext *s, AVStream *st, AVPacket *pkt, int interleaved)
{
int ret;
if (s->debug & FF_FDEBUG_TS)
av_log(s, AV_LOG_DEBUG, "%s size:%d dts:%s pts:%s\n", __FUNCTION__,
pkt->size, av_ts2str(pkt->dts), av_ts2str(pkt->pts));
#if FF_API_COMPUTE_PKT_FIELDS2 && FF_API_LAVF_AVCTX
if ((ret = compute_muxer_pkt_fields(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
return ret;
#endif
if (interleaved) {
if (pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
return AVERROR(EINVAL);
return interleaved_write_packet(s, pkt, 0);
} else {
return write_packet(s, pkt);
}
}
static int write_packets_from_bsfs(AVFormatContext *s, AVStream *st, AVPacket *pkt, int interleaved)
{
AVBSFContext *bsfc = st->internal->bsfc;
int ret;
if ((ret = av_bsf_send_packet(bsfc, pkt)) < 0) {
av_log(s, AV_LOG_ERROR,
"Failed to send packet to filter %s for stream %d\n",
bsfc->filter->name, st->index);
return ret;
}
do {
ret = av_bsf_receive_packet(bsfc, pkt);
if (ret < 0) {
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
return 0;
av_log(s, AV_LOG_ERROR, "Error applying bitstream filters to an output "
"packet for stream #%d: %s\n", st->index, av_err2str(ret));
if (!(s->error_recognition & AV_EF_EXPLODE) && ret != AVERROR(ENOMEM))
continue;
return ret;
}
av_packet_rescale_ts(pkt, bsfc->time_base_out, st->time_base);
ret = write_packet_common(s, st, pkt, interleaved);
if (ret >= 0 && !interleaved) // a successful write_packet_common already unrefed pkt for interleaved
av_packet_unref(pkt);
} while (ret >= 0);
return ret;
}
static int write_packets_common(AVFormatContext *s, AVPacket *pkt, int interleaved)
{
AVStream *st = s->streams[pkt->stream_index];
int ret = prepare_input_packet(s, pkt);
if (ret < 0)
return ret;
ret = check_bitstream(s, st, pkt);
if (ret < 0)
return ret;
if (st->internal->bsfc) {
return write_packets_from_bsfs(s, st, pkt, interleaved);
} else {
return write_packet_common(s, st, pkt, interleaved);
}
}
int av_write_frame(AVFormatContext *s, AVPacket *in)
{
AVPacket local_pkt, *pkt = &local_pkt;
int ret;
if (!in) {
if (s->oformat->flags & AVFMT_ALLOW_FLUSH) {
ret = s->oformat->write_packet(s, NULL);
flush_if_needed(s);
if (ret >= 0 && s->pb && s->pb->error < 0)
ret = s->pb->error;
return ret;
}
return 1;
}
if (in->flags & AV_PKT_FLAG_UNCODED_FRAME) {
pkt = in;
} else {
/* We don't own in, so we have to make sure not to modify it.
* The following avoids copying in's data unnecessarily.
* Copying side data is unavoidable as a bitstream filter
* may change it, e.g. free it on errors. */
pkt->buf = NULL;
pkt->data = in->data;
pkt->size = in->size;
ret = av_packet_copy_props(pkt, in);
if (ret < 0)
return ret;
if (in->buf) {
pkt->buf = av_buffer_ref(in->buf);
if (!pkt->buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
}
ret = write_packets_common(s, pkt, 0/*non-interleaved*/);
fail:
// Uncoded frames using the noninterleaved codepath are also freed here
av_packet_unref(pkt);
return ret;
}
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
{
int ret;
if (pkt) {
ret = write_packets_common(s, pkt, 1/*interleaved*/);
if (ret < 0)
av_packet_unref(pkt);
return ret;
} else {
av_log(s, AV_LOG_TRACE, "av_interleaved_write_frame FLUSH\n");
return interleaved_write_packet(s, NULL, 1/*flush*/);
}
}
int av_write_trailer(AVFormatContext *s)
{
int i, ret1, ret = 0;
AVPacket pkt = {0};
av_init_packet(&pkt);
for (i = 0; i < s->nb_streams; i++) {
if (s->streams[i]->internal->bsfc) {
ret1 = write_packets_from_bsfs(s, s->streams[i], &pkt, 1/*interleaved*/);
if (ret1 < 0)
av_packet_unref(&pkt);
if (ret >= 0)
ret = ret1;
}
}
ret1 = interleaved_write_packet(s, NULL, 1);
if (ret >= 0)
ret = ret1;
if (s->oformat->write_trailer) {
if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_TRAILER);
if (ret >= 0) {
ret = s->oformat->write_trailer(s);
} else {
s->oformat->write_trailer(s);
}
}
deinit_muxer(s);
if (s->pb)
avio_flush(s->pb);
if (ret == 0)
ret = s->pb ? s->pb->error : 0;
for (i = 0; i < s->nb_streams; i++) {
av_freep(&s->streams[i]->priv_data);
av_freep(&s->streams[i]->index_entries);
}
if (s->oformat->priv_class)
av_opt_free(s->priv_data);
av_freep(&s->priv_data);
return ret;
}
int av_get_output_timestamp(struct AVFormatContext *s, int stream,
int64_t *dts, int64_t *wall)
{
if (!s->oformat || !s->oformat->get_output_timestamp)
return AVERROR(ENOSYS);
s->oformat->get_output_timestamp(s, stream, dts, wall);
return 0;
}
int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
AVFormatContext *src, int interleave)
{
AVPacket local_pkt;
int ret;
local_pkt = *pkt;
local_pkt.stream_index = dst_stream;
av_packet_rescale_ts(&local_pkt,
src->streams[pkt->stream_index]->time_base,
dst->streams[dst_stream]->time_base);
if (interleave) ret = av_interleaved_write_frame(dst, &local_pkt);
else ret = av_write_frame(dst, &local_pkt);
pkt->buf = local_pkt.buf;
pkt->side_data = local_pkt.side_data;
pkt->side_data_elems = local_pkt.side_data_elems;
return ret;
}
static void uncoded_frame_free(void *unused, uint8_t *data)
{
av_frame_free((AVFrame **)data);
av_free(data);
}
static int write_uncoded_frame_internal(AVFormatContext *s, int stream_index,
AVFrame *frame, int interleaved)
{
AVPacket pkt, *pktp;
av_assert0(s->oformat);
if (!s->oformat->write_uncoded_frame) {
av_frame_free(&frame);
return AVERROR(ENOSYS);
}
if (!frame) {
pktp = NULL;
} else {
size_t bufsize = sizeof(frame) + AV_INPUT_BUFFER_PADDING_SIZE;
AVFrame **framep = av_mallocz(bufsize);
if (!framep)
goto fail;
pktp = &pkt;
av_init_packet(&pkt);
pkt.buf = av_buffer_create((void *)framep, bufsize,
uncoded_frame_free, NULL, 0);
if (!pkt.buf) {
av_free(framep);
fail:
av_frame_free(&frame);
return AVERROR(ENOMEM);
}
*framep = frame;
pkt.data = (void *)framep;
pkt.size = sizeof(frame);
pkt.pts =
pkt.dts = frame->pts;
pkt.duration = frame->pkt_duration;
pkt.stream_index = stream_index;
pkt.flags |= AV_PKT_FLAG_UNCODED_FRAME;
}
return interleaved ? av_interleaved_write_frame(s, pktp) :
av_write_frame(s, pktp);
}
int av_write_uncoded_frame(AVFormatContext *s, int stream_index,
AVFrame *frame)
{
return write_uncoded_frame_internal(s, stream_index, frame, 0);
}
int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index,
AVFrame *frame)
{
return write_uncoded_frame_internal(s, stream_index, frame, 1);
}
int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index)
{
av_assert0(s->oformat);
if (!s->oformat->write_uncoded_frame)
return AVERROR(ENOSYS);
return s->oformat->write_uncoded_frame(s, stream_index, NULL,
AV_WRITE_UNCODED_FRAME_QUERY);
}
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