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6d6ae3595b
FFmpeg/fftools/ffmpeg_mux.c
Anton Khirnov 42a0dd6e7e fftools/ffmpeg: add an option for writing pre-muxing stats 
Analogous to -enc_stats*, but happens right before muxing. Useful
because bitstream filters and the sync queue can modify packets after
encoding and before muxing. Also has access to the muxing timebase.
2023-02-09 15:24:15 +01:00

748 lines
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/*
* 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 <stdatomic.h>
#include <stdio.h>
#include <string.h>
#include "ffmpeg.h"
#include "ffmpeg_mux.h"
#include "objpool.h"
#include "sync_queue.h"
#include "thread_queue.h"
#include "libavutil/fifo.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/timestamp.h"
#include "libavutil/thread.h"
#include "libavcodec/packet.h"
#include "libavformat/avformat.h"
#include "libavformat/avio.h"
int want_sdp = 1;
static Muxer *mux_from_of(OutputFile *of)
{
return (Muxer*)of;
}
static int64_t filesize(AVIOContext *pb)
{
int64_t ret = -1;
if (pb) {
ret = avio_size(pb);
if (ret <= 0) // FIXME improve avio_size() so it works with non seekable output too
ret = avio_tell(pb);
}
return ret;
}
static int write_packet(Muxer *mux, OutputStream *ost, AVPacket *pkt)
{
MuxStream *ms = ms_from_ost(ost);
AVFormatContext *s = mux->fc;
AVStream *st = ost->st;
int64_t fs;
uint64_t frame_num;
int ret;
fs = filesize(s->pb);
atomic_store(&mux->last_filesize, fs);
if (fs >= mux->limit_filesize) {
ret = AVERROR_EOF;
goto fail;
}
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && ost->vsync_method == VSYNC_DROP)
pkt->pts = pkt->dts = AV_NOPTS_VALUE;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (ost->frame_rate.num && ost->is_cfr) {
if (pkt->duration > 0)
av_log(ost, AV_LOG_WARNING, "Overriding packet duration by frame rate, this should not happen\n");
pkt->duration = av_rescale_q(1, av_inv_q(ost->frame_rate),
pkt->time_base);
}
}
av_packet_rescale_ts(pkt, pkt->time_base, ost->st->time_base);
pkt->time_base = ost->st->time_base;
if (!(s->oformat->flags & AVFMT_NOTIMESTAMPS)) {
if (pkt->dts != AV_NOPTS_VALUE &&
pkt->pts != AV_NOPTS_VALUE &&
pkt->dts > pkt->pts) {
av_log(s, AV_LOG_WARNING, "Invalid DTS: %"PRId64" PTS: %"PRId64" in output stream %d:%d, replacing by guess\n",
pkt->dts, pkt->pts,
ost->file_index, ost->st->index);
pkt->pts =
pkt->dts = pkt->pts + pkt->dts + ms->last_mux_dts + 1
- FFMIN3(pkt->pts, pkt->dts, ms->last_mux_dts + 1)
- FFMAX3(pkt->pts, pkt->dts, ms->last_mux_dts + 1);
}
if ((st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO || st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) &&
pkt->dts != AV_NOPTS_VALUE &&
ms->last_mux_dts != AV_NOPTS_VALUE) {
int64_t max = ms->last_mux_dts + !(s->oformat->flags & AVFMT_TS_NONSTRICT);
if (pkt->dts < max) {
int loglevel = max - pkt->dts > 2 || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ? AV_LOG_WARNING : AV_LOG_DEBUG;
if (exit_on_error)
loglevel = AV_LOG_ERROR;
av_log(s, loglevel, "Non-monotonous DTS in output stream "
"%d:%d; previous: %"PRId64", current: %"PRId64"; ",
ost->file_index, ost->st->index, ms->last_mux_dts, pkt->dts);
if (exit_on_error) {
ret = AVERROR(EINVAL);
goto fail;
}
av_log(s, loglevel, "changing to %"PRId64". This may result "
"in incorrect timestamps in the output file.\n",
max);
if (pkt->pts >= pkt->dts)
pkt->pts = FFMAX(pkt->pts, max);
pkt->dts = max;
}
}
}
ms->last_mux_dts = pkt->dts;
ost->data_size_mux += pkt->size;
frame_num = atomic_fetch_add(&ost->packets_written, 1);
pkt->stream_index = ost->index;
if (debug_ts) {
av_log(ost, AV_LOG_INFO, "muxer <- type:%s "
"pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s duration:%s duration_time:%s size:%d\n",
av_get_media_type_string(st->codecpar->codec_type),
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &ost->st->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &ost->st->time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, &ost->st->time_base),
pkt->size
);
}
if (ms->stats.io)
enc_stats_write(ost, &ms->stats, NULL, pkt, frame_num);
ret = av_interleaved_write_frame(s, pkt);
if (ret < 0) {
print_error("av_interleaved_write_frame()", ret);
goto fail;
}
return 0;
fail:
av_packet_unref(pkt);
return ret;
}
static int sync_queue_process(Muxer *mux, OutputStream *ost, AVPacket *pkt)
{
OutputFile *of = &mux->of;
if (ost->sq_idx_mux >= 0) {
int ret = sq_send(mux->sq_mux, ost->sq_idx_mux, SQPKT(pkt));
if (ret < 0)
return ret;
while (1) {
ret = sq_receive(mux->sq_mux, -1, SQPKT(mux->sq_pkt));
if (ret < 0)
return (ret == AVERROR_EOF || ret == AVERROR(EAGAIN)) ? 0 : ret;
ret = write_packet(mux, of->streams[ret],
mux->sq_pkt);
if (ret < 0)
return ret;
}
} else if (pkt)
return write_packet(mux, ost, pkt);
return 0;
}
static void thread_set_name(OutputFile *of)
{
char name[16];
snprintf(name, sizeof(name), "mux%d:%s", of->index, of->format->name);
ff_thread_setname(name);
}
static void *muxer_thread(void *arg)
{
Muxer *mux = arg;
OutputFile *of = &mux->of;
AVPacket *pkt = NULL;
int ret = 0;
pkt = av_packet_alloc();
if (!pkt) {
ret = AVERROR(ENOMEM);
goto finish;
}
thread_set_name(of);
while (1) {
OutputStream *ost;
int stream_idx;
ret = tq_receive(mux->tq, &stream_idx, pkt);
if (stream_idx < 0) {
av_log(mux, AV_LOG_VERBOSE, "All streams finished\n");
ret = 0;
break;
}
ost = of->streams[stream_idx];
ret = sync_queue_process(mux, ost, ret < 0 ? NULL : pkt);
av_packet_unref(pkt);
if (ret == AVERROR_EOF)
tq_receive_finish(mux->tq, stream_idx);
else if (ret < 0) {
av_log(mux, AV_LOG_ERROR, "Error muxing a packet\n");
break;
}
}
finish:
av_packet_free(&pkt);
for (unsigned int i = 0; i < mux->fc->nb_streams; i++)
tq_receive_finish(mux->tq, i);
av_log(mux, AV_LOG_VERBOSE, "Terminating muxer thread\n");
return (void*)(intptr_t)ret;
}
static int thread_submit_packet(Muxer *mux, OutputStream *ost, AVPacket *pkt)
{
int ret = 0;
if (!pkt || ost->finished & MUXER_FINISHED)
goto finish;
ret = tq_send(mux->tq, ost->index, pkt);
if (ret < 0)
goto finish;
return 0;
finish:
if (pkt)
av_packet_unref(pkt);
ost->finished |= MUXER_FINISHED;
tq_send_finish(mux->tq, ost->index);
return ret == AVERROR_EOF ? 0 : ret;
}
static int queue_packet(Muxer *mux, OutputStream *ost, AVPacket *pkt)
{
MuxStream *ms = ms_from_ost(ost);
AVPacket *tmp_pkt = NULL;
int ret;
if (!av_fifo_can_write(ms->muxing_queue)) {
size_t cur_size = av_fifo_can_read(ms->muxing_queue);
size_t pkt_size = pkt ? pkt->size : 0;
unsigned int are_we_over_size =
(ms->muxing_queue_data_size + pkt_size) > ms->muxing_queue_data_threshold;
size_t limit = are_we_over_size ? ms->max_muxing_queue_size : SIZE_MAX;
size_t new_size = FFMIN(2 * cur_size, limit);
if (new_size <= cur_size) {
av_log(ost, AV_LOG_ERROR,
"Too many packets buffered for output stream %d:%d.\n",
ost->file_index, ost->st->index);
return AVERROR(ENOSPC);
}
ret = av_fifo_grow2(ms->muxing_queue, new_size - cur_size);
if (ret < 0)
return ret;
}
if (pkt) {
ret = av_packet_make_refcounted(pkt);
if (ret < 0)
return ret;
tmp_pkt = av_packet_alloc();
if (!tmp_pkt)
return AVERROR(ENOMEM);
av_packet_move_ref(tmp_pkt, pkt);
ms->muxing_queue_data_size += tmp_pkt->size;
}
av_fifo_write(ms->muxing_queue, &tmp_pkt, 1);
return 0;
}
static int submit_packet(Muxer *mux, AVPacket *pkt, OutputStream *ost)
{
int ret;
if (mux->tq) {
return thread_submit_packet(mux, ost, pkt);
} else {
/* the muxer is not initialized yet, buffer the packet */
ret = queue_packet(mux, ost, pkt);
if (ret < 0) {
if (pkt)
av_packet_unref(pkt);
return ret;
}
}
return 0;
}
void of_output_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int eof)
{
Muxer *mux = mux_from_of(of);
MuxStream *ms = ms_from_ost(ost);
const char *err_msg;
int ret = 0;
if (!eof && pkt->dts != AV_NOPTS_VALUE)
ost->last_mux_dts = av_rescale_q(pkt->dts, pkt->time_base, AV_TIME_BASE_Q);
/* apply the output bitstream filters */
if (ms->bsf_ctx) {
int bsf_eof = 0;
ret = av_bsf_send_packet(ms->bsf_ctx, eof ? NULL : pkt);
if (ret < 0) {
err_msg = "submitting a packet for bitstream filtering";
goto fail;
}
while (!bsf_eof) {
ret = av_bsf_receive_packet(ms->bsf_ctx, pkt);
if (ret == AVERROR(EAGAIN))
return;
else if (ret == AVERROR_EOF)
bsf_eof = 1;
else if (ret < 0) {
err_msg = "applying bitstream filters to a packet";
goto fail;
}
ret = submit_packet(mux, bsf_eof ? NULL : pkt, ost);
if (ret < 0)
goto mux_fail;
}
} else {
ret = submit_packet(mux, eof ? NULL : pkt, ost);
if (ret < 0)
goto mux_fail;
}
return;
mux_fail:
err_msg = "submitting a packet to the muxer";
fail:
av_log(ost, AV_LOG_ERROR, "Error %s\n", err_msg);
if (exit_on_error)
exit_program(1);
}
static int thread_stop(Muxer *mux)
{
void *ret;
if (!mux || !mux->tq)
return 0;
for (unsigned int i = 0; i < mux->fc->nb_streams; i++)
tq_send_finish(mux->tq, i);
pthread_join(mux->thread, &ret);
tq_free(&mux->tq);
return (int)(intptr_t)ret;
}
static void pkt_move(void *dst, void *src)
{
av_packet_move_ref(dst, src);
}
static int thread_start(Muxer *mux)
{
AVFormatContext *fc = mux->fc;
ObjPool *op;
int ret;
op = objpool_alloc_packets();
if (!op)
return AVERROR(ENOMEM);
mux->tq = tq_alloc(fc->nb_streams, mux->thread_queue_size, op, pkt_move);
if (!mux->tq) {
objpool_free(&op);
return AVERROR(ENOMEM);
}
ret = pthread_create(&mux->thread, NULL, muxer_thread, (void*)mux);
if (ret) {
tq_free(&mux->tq);
return AVERROR(ret);
}
/* flush the muxing queues */
for (int i = 0; i < fc->nb_streams; i++) {
OutputStream *ost = mux->of.streams[i];
MuxStream *ms = ms_from_ost(ost);
AVPacket *pkt;
/* try to improve muxing time_base (only possible if nothing has been written yet) */
if (!av_fifo_can_read(ms->muxing_queue))
ost->mux_timebase = ost->st->time_base;
while (av_fifo_read(ms->muxing_queue, &pkt, 1) >= 0) {
ret = thread_submit_packet(mux, ost, pkt);
if (pkt) {
ms->muxing_queue_data_size -= pkt->size;
av_packet_free(&pkt);
}
if (ret < 0)
return ret;
}
}
return 0;
}
static int print_sdp(void)
{
char sdp[16384];
int i;
int j, ret;
AVIOContext *sdp_pb;
AVFormatContext **avc;
for (i = 0; i < nb_output_files; i++) {
if (!mux_from_of(output_files[i])->header_written)
return 0;
}
avc = av_malloc_array(nb_output_files, sizeof(*avc));
if (!avc)
return AVERROR(ENOMEM);
for (i = 0, j = 0; i < nb_output_files; i++) {
if (!strcmp(output_files[i]->format->name, "rtp")) {
avc[j] = mux_from_of(output_files[i])->fc;
j++;
}
}
if (!j) {
av_log(NULL, AV_LOG_ERROR, "No output streams in the SDP.\n");
ret = AVERROR(EINVAL);
goto fail;
}
ret = av_sdp_create(avc, j, sdp, sizeof(sdp));
if (ret < 0)
goto fail;
if (!sdp_filename) {
printf("SDP:\n%s\n", sdp);
fflush(stdout);
} else {
ret = avio_open2(&sdp_pb, sdp_filename, AVIO_FLAG_WRITE, &int_cb, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Failed to open sdp file '%s'\n", sdp_filename);
goto fail;
}
avio_print(sdp_pb, sdp);
avio_closep(&sdp_pb);
av_freep(&sdp_filename);
}
// SDP successfully written, allow muxer threads to start
ret = 1;
fail:
av_freep(&avc);
return ret;
}
int mux_check_init(Muxer *mux)
{
OutputFile *of = &mux->of;
AVFormatContext *fc = mux->fc;
int ret, i;
for (i = 0; i < fc->nb_streams; i++) {
OutputStream *ost = of->streams[i];
if (!ost->initialized)
return 0;
}
ret = avformat_write_header(fc, &mux->opts);
if (ret < 0) {
av_log(mux, AV_LOG_ERROR, "Could not write header (incorrect codec "
"parameters ?): %s\n", av_err2str(ret));
return ret;
}
//assert_avoptions(of->opts);
mux->header_written = 1;
av_dump_format(fc, of->index, fc->url, 1);
nb_output_dumped++;
if (sdp_filename || want_sdp) {
ret = print_sdp();
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error writing the SDP.\n");
return ret;
} else if (ret == 1) {
/* SDP is written only after all the muxers are ready, so now we
* start ALL the threads */
for (i = 0; i < nb_output_files; i++) {
ret = thread_start(mux_from_of(output_files[i]));
if (ret < 0)
return ret;
}
}
} else {
ret = thread_start(mux_from_of(of));
if (ret < 0)
return ret;
}
return 0;
}
static int bsf_init(MuxStream *ms)
{
OutputStream *ost = &ms->ost;
AVBSFContext *ctx = ms->bsf_ctx;
int ret;
if (!ctx)
return 0;
ret = avcodec_parameters_copy(ctx->par_in, ost->st->codecpar);
if (ret < 0)
return ret;
ctx->time_base_in = ost->st->time_base;
ret = av_bsf_init(ctx);
if (ret < 0) {
av_log(ms, AV_LOG_ERROR, "Error initializing bitstream filter: %s\n",
ctx->filter->name);
return ret;
}
ret = avcodec_parameters_copy(ost->st->codecpar, ctx->par_out);
if (ret < 0)
return ret;
ost->st->time_base = ctx->time_base_out;
return 0;
}
int of_stream_init(OutputFile *of, OutputStream *ost)
{
Muxer *mux = mux_from_of(of);
MuxStream *ms = ms_from_ost(ost);
int ret;
if (ost->sq_idx_mux >= 0)
sq_set_tb(mux->sq_mux, ost->sq_idx_mux, ost->mux_timebase);
/* initialize bitstream filters for the output stream
* needs to be done here, because the codec id for streamcopy is not
* known until now */
ret = bsf_init(ms);
if (ret < 0)
return ret;
ost->initialized = 1;
return mux_check_init(mux);
}
int of_write_trailer(OutputFile *of)
{
Muxer *mux = mux_from_of(of);
AVFormatContext *fc = mux->fc;
int ret;
if (!mux->tq) {
av_log(mux, AV_LOG_ERROR,
"Nothing was written into output file, because "
"at least one of its streams received no packets.\n");
return AVERROR(EINVAL);
}
ret = thread_stop(mux);
if (ret < 0)
main_return_code = ret;
ret = av_write_trailer(fc);
if (ret < 0) {
av_log(mux, AV_LOG_ERROR, "Error writing trailer: %s\n", av_err2str(ret));
return ret;
}
mux->last_filesize = filesize(fc->pb);
if (!(of->format->flags & AVFMT_NOFILE)) {
ret = avio_closep(&fc->pb);
if (ret < 0) {
av_log(mux, AV_LOG_ERROR, "Error closing file: %s\n", av_err2str(ret));
return ret;
}
}
return 0;
}
static void ost_free(OutputStream **post)
{
OutputStream *ost = *post;
MuxStream *ms;
if (!ost)
return;
ms = ms_from_ost(ost);
if (ost->logfile) {
if (fclose(ost->logfile))
av_log(ms, AV_LOG_ERROR,
"Error closing logfile, loss of information possible: %s\n",
av_err2str(AVERROR(errno)));
ost->logfile = NULL;
}
if (ms->muxing_queue) {
AVPacket *pkt;
while (av_fifo_read(ms->muxing_queue, &pkt, 1) >= 0)
av_packet_free(&pkt);
av_fifo_freep2(&ms->muxing_queue);
}
av_bsf_free(&ms->bsf_ctx);
av_frame_free(&ost->filtered_frame);
av_frame_free(&ost->sq_frame);
av_frame_free(&ost->last_frame);
av_packet_free(&ost->pkt);
av_dict_free(&ost->encoder_opts);
av_freep(&ost->kf.pts);
av_expr_free(ost->kf.pexpr);
av_freep(&ost->avfilter);
av_freep(&ost->logfile_prefix);
av_freep(&ost->apad);
#if FFMPEG_OPT_MAP_CHANNEL
av_freep(&ost->audio_channels_map);
ost->audio_channels_mapped = 0;
#endif
av_dict_free(&ost->sws_dict);
av_dict_free(&ost->swr_opts);
if (ost->enc_ctx)
av_freep(&ost->enc_ctx->stats_in);
avcodec_free_context(&ost->enc_ctx);
for (int i = 0; i < ost->enc_stats_pre.nb_components; i++)
av_freep(&ost->enc_stats_pre.components[i].str);
av_freep(&ost->enc_stats_pre.components);
for (int i = 0; i < ost->enc_stats_post.nb_components; i++)
av_freep(&ost->enc_stats_post.components[i].str);
av_freep(&ost->enc_stats_post.components);
for (int i = 0; i < ms->stats.nb_components; i++)
av_freep(&ms->stats.components[i].str);
av_freep(&ms->stats.components);
av_freep(post);
}
static void fc_close(AVFormatContext **pfc)
{
AVFormatContext *fc = *pfc;
if (!fc)
return;
if (!(fc->oformat->flags & AVFMT_NOFILE))
avio_closep(&fc->pb);
avformat_free_context(fc);
*pfc = NULL;
}
void of_close(OutputFile **pof)
{
OutputFile *of = *pof;
Muxer *mux;
if (!of)
return;
mux = mux_from_of(of);
thread_stop(mux);
sq_free(&of->sq_encode);
sq_free(&mux->sq_mux);
for (int i = 0; i < of->nb_streams; i++)
ost_free(&of->streams[i]);
av_freep(&of->streams);
av_dict_free(&mux->opts);
av_packet_free(&mux->sq_pkt);
fc_close(&mux->fc);
av_freep(pof);
}
int64_t of_filesize(OutputFile *of)
{
Muxer *mux = mux_from_of(of);
return atomic_load(&mux->last_filesize);
}
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