RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-01-19 13:50:58 +00:00
Code Issues Projects Releases Wiki Activity
fc9cb7d51a
ffmpeg/libavformat/mux.c
Andreas Rheinhardt 2f710734c8 avformat/mux: Fix double-free when using AVPacket.opaque_ref 
Up until now, ff_write_chained() copied the packet (manually, not with
av_packet_move_ref()) from a packet given to it to a stack packet whose
timing and stream_index is then modified before being sent to another
muxer via av_(interleaved_)write_frame(). Afterwards it is intended to
sync the fields of the packet relevant to freeing again; yet this only
encompasses buf, side_data and side_data_elems and not the newly added
opaque_ref. The other fields are not synced so that the returned packet
can have a size > 0 and data != NULL despite its buf being NULL (this
always happens in the interleaved codepath; before commit
fe251f77c80b0512ab8907902e1dbed3f4fe1aad it could also happen in the
noninterleaved one). This leads to double-frees if the interleaved
codepath is used and opaque_ref is set.

This commit therefore changes this by directly reusing the packet
instead of a spare packet. Given that av_write_frame() does not
change the packet given to it, one only needs to restore the timing
information to return it as it was; for the interleaved codepath
it is not possible to do likewise*, because av_interleaved_write_frame()
takes ownership of the packets given to it and returns blank packets.
But precisely because of this users of the interleaved codepath
have no legitimate expectation that their packet will be returned
unchanged. In line with av_interleaved_write_frame() ff_write_chained()
therefore returns blank packets when using the interleaved codepath.

Making the only user of said codepath compatible with this was trivial.

*: Unless one wanted to create a full new reference.

Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-09-03 19:23:18 +02:00

1390 lines
45 KiB
C
Raw Blame History

/*
* 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/bsf.h"
#include "libavcodec/internal.h"
#include "libavcodec/packet_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, const 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 (!(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 (!s->url && !(s->url = av_strdup(""))) {
ret = AVERROR(ENOMEM);
goto fail;
}
// 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 (!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_DISABLE_DEPRECATION_WARNINGS
//FIXME merge with compute_pkt_fields
static int compute_muxer_pkt_fields(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
int delay = st->codecpar->video_delay;
int 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->internal->cur_dts), delay, pkt->size, pkt->stream_index);
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->internal->pts_buffer[0] = pkt->pts;
for (i = 1; i < delay + 1 && st->internal->pts_buffer[i] == AV_NOPTS_VALUE; i++)
st->internal->pts_buffer[i] = pkt->pts + (i - delay - 1) * pkt->duration;
for (i = 0; i<delay && st->internal->pts_buffer[i] > st->internal->pts_buffer[i + 1]; i++)
FFSWAP(int64_t, st->internal->pts_buffer[i], st->internal->pts_buffer[i + 1]);
pkt->dts = st->internal->pts_buffer[0];
}
if (st->internal->cur_dts && st->internal->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->internal->cur_dts >= pkt->dts) || st->internal->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->internal->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->internal->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_duration2(st->codecpar, 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
static void guess_pkt_duration(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
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;
}
if (pkt->duration)
return;
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0) {
pkt->duration = av_rescale_q(1, av_inv_q(st->avg_frame_rate),
st->time_base);
} else if (st->time_base.num * 1000LL > st->time_base.den)
pkt->duration = 1;
break;
case AVMEDIA_TYPE_AUDIO: {
int frame_size = av_get_audio_frame_duration2(st->codecpar, pkt->size);
if (frame_size && st->codecpar->sample_rate) {
pkt->duration = av_rescale_q(frame_size,
(AVRational){1, st->codecpar->sample_rate},
st->time_base);
}
break;
}
}
}
/**
* 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)
{
AVStream *const st = s->streams[pkt->stream_index];
int ret;
// If the timestamp offsetting below is adjusted, adjust
// ff_interleaved_peek similarly.
if (s->output_ts_offset) {
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) {
int64_t offset = st->internal->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->internal->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)
st->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, AVStream *st, AVPacket *pkt)
{
#if !FF_API_COMPUTE_PKT_FIELDS2
/* 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->internal->cur_dts != AV_NOPTS_VALUE &&
((!(s->oformat->flags & AVFMT_TS_NONSTRICT) && st->internal->cur_dts >= pkt->dts) ||
st->internal->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->internal->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;
PacketList **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(PacketList));
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->internal->last_in_packet_buffer) {
next_point = &(st->internal->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->internal->interleaver_chunk_size += pkt->size;
st->internal->interleaver_chunk_duration += pkt->duration;
if ( (s->max_chunk_size && st->internal->interleaver_chunk_size > s->max_chunk_size)
|| (max && st->internal->interleaver_chunk_duration > max)) {
st->internal->interleaver_chunk_size = 0;
pkt->flags |= CHUNK_START;
if (max && st->internal->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->internal->interleaver_chunk_duration += (pkt->dts - syncto)/8 - max;
} else
st->internal->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->internal->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)
{
PacketList *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]->internal->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 PacketList *last = s->streams[i]->internal->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->internal->last_in_packet_buffer == pktl)
st->internal->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->internal->last_in_packet_buffer == pktl)
st->internal->last_in_packet_buffer = NULL;
av_freep(&pktl);
return 1;
} else {
return 0;
}
}
int ff_get_muxer_ts_offset(AVFormatContext *s, int stream_index, int64_t *offset)
{
AVStream *st;
if (stream_index < 0 || stream_index >= s->nb_streams)
return AVERROR(EINVAL);
st = s->streams[stream_index];
*offset = st->internal->mux_ts_offset;
if (s->output_ts_offset)
*offset += av_rescale_q(s->output_ts_offset, AV_TIME_BASE_Q, st->time_base);
return 0;
}
const AVPacket *ff_interleaved_peek(AVFormatContext *s, int stream)
{
PacketList *pktl = s->internal->packet_buffer;
while (pktl) {
if (pktl->pkt.stream_index == stream) {
return &pktl->pkt;
}
pktl = pktl->next;
}
return NULL;
}
/**
* 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) {
return s->oformat->interleave_packet(s, out, in, flush);
} 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));
guess_pkt_duration(s, st, pkt);
#if FF_API_COMPUTE_PKT_FIELDS2
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;
int ret = check_packet(s, pkt);
if (ret < 0)
return ret;
st = s->streams[pkt->stream_index];
ret = prepare_input_packet(s, st, 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 *pkt = s->internal->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.
* (ff_write_chained() relies on this fact.)
* 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. */
av_packet_unref(pkt);
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 = s->internal->pkt;
av_packet_unref(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]->internal->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)
{
int64_t pts = pkt->pts, dts = pkt->dts, duration = pkt->duration;
int stream_index = pkt->stream_index;
AVRational time_base = pkt->time_base;
int ret;
pkt->stream_index = dst_stream;
av_packet_rescale_ts(pkt,
src->streams[stream_index]->time_base,
dst->streams[dst_stream]->time_base);
if (!interleave) {
ret = av_write_frame(dst, pkt);
/* We only have to backup and restore the fields that
* we changed ourselves, because av_write_frame() does not
* modify the packet given to it. */
pkt->pts = pts;
pkt->dts = dts;
pkt->duration = duration;
pkt->stream_index = stream_index;
pkt->time_base = time_base;
} else
ret = av_interleaved_write_frame(dst, pkt);
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 = s->internal->pkt;
av_assert0(s->oformat);
if (!s->oformat->write_uncoded_frame) {
av_frame_free(&frame);
return AVERROR(ENOSYS);
}
if (!frame) {
pkt = NULL;
} else {
size_t bufsize = sizeof(frame) + AV_INPUT_BUFFER_PADDING_SIZE;
AVFrame **framep = av_mallocz(bufsize);
if (!framep)
goto fail;
av_packet_unref(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, pkt) :
av_write_frame(s, pkt);
}
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);
}
Reference in New Issue View Git Blame Copy Permalink