[FFmpeg-cvslog] fftools/ffmpeg: add thread-aware transcode scheduling infrastructure
Anton Khirnov
git at videolan.org
Tue Dec 12 09:41:14 EET 2023
ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Thu May 18 16:56:15 2023 +0200| [9b8cc36ce0b2417469d78c68780c8796886c202e] | committer: Anton Khirnov
fftools/ffmpeg: add thread-aware transcode scheduling infrastructure
See the comment block at the top of fftools/ffmpeg_sched.h for more
details on what this scheduler is for.
This commit adds the scheduling code itself, along with minimal
integration with the rest of the program:
* allocating and freeing the scheduler
* passing it throughout the call stack in order to register the
individual components (demuxers/decoders/filtergraphs/encoders/muxers)
with the scheduler
The scheduler is not actually used as of this commit, so it should not
result in any change in behavior. That will change in future commits.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9b8cc36ce0b2417469d78c68780c8796886c202e
---
fftools/Makefile | 1 +
fftools/ffmpeg.c | 18 +-
fftools/ffmpeg.h | 24 +-
fftools/ffmpeg_dec.c | 10 +-
fftools/ffmpeg_demux.c | 46 +-
fftools/ffmpeg_enc.c | 13 +-
fftools/ffmpeg_filter.c | 37 +-
fftools/ffmpeg_mux.c | 17 +-
fftools/ffmpeg_mux.h | 12 +
fftools/ffmpeg_mux_init.c | 106 ++-
fftools/ffmpeg_opt.c | 22 +-
fftools/ffmpeg_sched.c | 2218 +++++++++++++++++++++++++++++++++++++++++++++
fftools/ffmpeg_sched.h | 468 ++++++++++
13 files changed, 2936 insertions(+), 56 deletions(-)
diff --git a/fftools/Makefile b/fftools/Makefile
index 3c763e3db9..083a1368ce 100644
--- a/fftools/Makefile
+++ b/fftools/Makefile
@@ -18,6 +18,7 @@ OBJS-ffmpeg += \
fftools/ffmpeg_mux.o \
fftools/ffmpeg_mux_init.o \
fftools/ffmpeg_opt.o \
+ fftools/ffmpeg_sched.o \
fftools/objpool.o \
fftools/sync_queue.o \
fftools/thread_queue.o \
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index cf8a50bffc..b8a97258a0 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -99,6 +99,7 @@
#include "cmdutils.h"
#include "ffmpeg.h"
+#include "ffmpeg_sched.h"
#include "ffmpeg_utils.h"
#include "sync_queue.h"
@@ -1167,7 +1168,7 @@ static int transcode_step(OutputStream *ost, AVPacket *demux_pkt)
/*
* The following code is the main loop of the file converter
*/
-static int transcode(int *err_rate_exceeded)
+static int transcode(Scheduler *sch, int *err_rate_exceeded)
{
int ret = 0, i;
InputStream *ist;
@@ -1305,6 +1306,8 @@ static int64_t getmaxrss(void)
int main(int argc, char **argv)
{
+ Scheduler *sch = NULL;
+
int ret, err_rate_exceeded;
BenchmarkTimeStamps ti;
@@ -1322,8 +1325,14 @@ int main(int argc, char **argv)
show_banner(argc, argv, options);
+ sch = sch_alloc();
+ if (!sch) {
+ ret = AVERROR(ENOMEM);
+ goto finish;
+ }
+
/* parse options and open all input/output files */
- ret = ffmpeg_parse_options(argc, argv);
+ ret = ffmpeg_parse_options(argc, argv, sch);
if (ret < 0)
goto finish;
@@ -1341,7 +1350,7 @@ int main(int argc, char **argv)
}
current_time = ti = get_benchmark_time_stamps();
- ret = transcode(&err_rate_exceeded);
+ ret = transcode(sch, &err_rate_exceeded);
if (ret >= 0 && do_benchmark) {
int64_t utime, stime, rtime;
current_time = get_benchmark_time_stamps();
@@ -1361,5 +1370,8 @@ finish:
ret = 0;
ffmpeg_cleanup(ret);
+
+ sch_free(&sch);
+
return ret;
}
diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 3c153021f8..a89038b765 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -27,6 +27,7 @@
#include <signal.h>
#include "cmdutils.h"
+#include "ffmpeg_sched.h"
#include "sync_queue.h"
#include "libavformat/avformat.h"
@@ -721,7 +722,8 @@ int parse_and_set_vsync(const char *arg, int *vsync_var, int file_idx, int st_id
int check_filter_outputs(void);
int filtergraph_is_simple(const FilterGraph *fg);
int init_simple_filtergraph(InputStream *ist, OutputStream *ost,
- char *graph_desc);
+ char *graph_desc,
+ Scheduler *sch, unsigned sch_idx_enc);
int init_complex_filtergraph(FilterGraph *fg);
int copy_av_subtitle(AVSubtitle *dst, const AVSubtitle *src);
@@ -746,7 +748,8 @@ void ifilter_sub2video_heartbeat(InputFilter *ifilter, int64_t pts, AVRational t
*/
int ifilter_parameters_from_dec(InputFilter *ifilter, const AVCodecContext *dec);
-int ofilter_bind_ost(OutputFilter *ofilter, OutputStream *ost);
+int ofilter_bind_ost(OutputFilter *ofilter, OutputStream *ost,
+ unsigned sched_idx_enc);
/**
* Create a new filtergraph in the global filtergraph list.
@@ -754,7 +757,7 @@ int ofilter_bind_ost(OutputFilter *ofilter, OutputStream *ost);
* @param graph_desc Graph description; an av_malloc()ed string, filtergraph
* takes ownership of it.
*/
-int fg_create(FilterGraph **pfg, char *graph_desc);
+int fg_create(FilterGraph **pfg, char *graph_desc, Scheduler *sch);
void fg_free(FilterGraph **pfg);
@@ -778,7 +781,7 @@ void fg_send_command(FilterGraph *fg, double time, const char *target,
*/
int reap_filters(FilterGraph *fg, int flush);
-int ffmpeg_parse_options(int argc, char **argv);
+int ffmpeg_parse_options(int argc, char **argv, Scheduler *sch);
void enc_stats_write(OutputStream *ost, EncStats *es,
const AVFrame *frame, const AVPacket *pkt,
@@ -801,7 +804,7 @@ AVBufferRef *hw_device_for_filter(void);
int hwaccel_retrieve_data(AVCodecContext *avctx, AVFrame *input);
-int dec_open(InputStream *ist);
+int dec_open(InputStream *ist, Scheduler *sch, unsigned sch_idx);
void dec_free(Decoder **pdec);
/**
@@ -815,7 +818,8 @@ void dec_free(Decoder **pdec);
*/
int dec_packet(InputStream *ist, const AVPacket *pkt, int no_eof);
-int enc_alloc(Encoder **penc, const AVCodec *codec);
+int enc_alloc(Encoder **penc, const AVCodec *codec,
+ Scheduler *sch, unsigned sch_idx);
void enc_free(Encoder **penc);
int enc_open(OutputStream *ost, const AVFrame *frame);
@@ -831,7 +835,7 @@ int enc_flush(void);
*/
int of_stream_init(OutputFile *of, OutputStream *ost);
int of_write_trailer(OutputFile *of);
-int of_open(const OptionsContext *o, const char *filename);
+int of_open(const OptionsContext *o, const char *filename, Scheduler *sch);
void of_free(OutputFile **pof);
void of_enc_stats_close(void);
@@ -845,7 +849,7 @@ int of_streamcopy(OutputStream *ost, const AVPacket *pkt, int64_t dts);
int64_t of_filesize(OutputFile *of);
-int ifile_open(const OptionsContext *o, const char *filename);
+int ifile_open(const OptionsContext *o, const char *filename, Scheduler *sch);
void ifile_close(InputFile **f);
/**
@@ -932,4 +936,8 @@ extern const char * const opt_name_frame_rates[];
extern const char * const opt_name_top_field_first[];
#endif
+void *muxer_thread(void *arg);
+void *decoder_thread(void *arg);
+void *encoder_thread(void *arg);
+
#endif /* FFTOOLS_FFMPEG_H */
diff --git a/fftools/ffmpeg_dec.c b/fftools/ffmpeg_dec.c
index b60bad1220..90ea0d6d93 100644
--- a/fftools/ffmpeg_dec.c
+++ b/fftools/ffmpeg_dec.c
@@ -52,6 +52,9 @@ struct Decoder {
AVFrame *sub_prev[2];
AVFrame *sub_heartbeat;
+ Scheduler *sch;
+ unsigned sch_idx;
+
pthread_t thread;
/**
* Queue for sending coded packets from the main thread to
@@ -673,7 +676,7 @@ fail:
return AVERROR(ENOMEM);
}
-static void *decoder_thread(void *arg)
+void *decoder_thread(void *arg)
{
InputStream *ist = arg;
InputFile *ifile = input_files[ist->file_index];
@@ -1045,7 +1048,7 @@ static int hw_device_setup_for_decode(InputStream *ist)
return 0;
}
-int dec_open(InputStream *ist)
+int dec_open(InputStream *ist, Scheduler *sch, unsigned sch_idx)
{
Decoder *d;
const AVCodec *codec = ist->dec;
@@ -1063,6 +1066,9 @@ int dec_open(InputStream *ist)
return ret;
d = ist->decoder;
+ d->sch = sch;
+ d->sch_idx = sch_idx;
+
if (codec->type == AVMEDIA_TYPE_SUBTITLE && ist->fix_sub_duration) {
for (int i = 0; i < FF_ARRAY_ELEMS(d->sub_prev); i++) {
d->sub_prev[i] = av_frame_alloc();
diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index 65a5e08ca5..2234dbe076 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -20,6 +20,7 @@
#include <stdint.h>
#include "ffmpeg.h"
+#include "ffmpeg_sched.h"
#include "ffmpeg_utils.h"
#include "objpool.h"
#include "thread_queue.h"
@@ -60,6 +61,9 @@ typedef struct DemuxStream {
// name used for logging
char log_name[32];
+ int sch_idx_stream;
+ int sch_idx_dec;
+
double ts_scale;
int streamcopy_needed;
@@ -108,6 +112,7 @@ typedef struct Demuxer {
double readrate_initial_burst;
+ Scheduler *sch;
ThreadQueue *thread_queue;
int thread_queue_size;
pthread_t thread;
@@ -780,7 +785,9 @@ void ifile_close(InputFile **pf)
static int ist_use(InputStream *ist, int decoding_needed)
{
+ Demuxer *d = demuxer_from_ifile(input_files[ist->file_index]);
DemuxStream *ds = ds_from_ist(ist);
+ int ret;
if (ist->user_set_discard == AVDISCARD_ALL) {
av_log(ist, AV_LOG_ERROR, "Cannot %s a disabled input stream\n",
@@ -788,13 +795,32 @@ static int ist_use(InputStream *ist, int decoding_needed)
return AVERROR(EINVAL);
}
+ if (ds->sch_idx_stream < 0) {
+ ret = sch_add_demux_stream(d->sch, d->f.index);
+ if (ret < 0)
+ return ret;
+ ds->sch_idx_stream = ret;
+ }
+
ist->discard = 0;
ist->st->discard = ist->user_set_discard;
ist->decoding_needed |= decoding_needed;
ds->streamcopy_needed |= !decoding_needed;
- if (decoding_needed && !avcodec_is_open(ist->dec_ctx)) {
- int ret = dec_open(ist);
+ if (decoding_needed && ds->sch_idx_dec < 0) {
+ int is_audio = ist->st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
+
+ ret = sch_add_dec(d->sch, decoder_thread, ist, d->loop && is_audio);
+ if (ret < 0)
+ return ret;
+ ds->sch_idx_dec = ret;
+
+ ret = sch_connect(d->sch, SCH_DSTREAM(d->f.index, ds->sch_idx_stream),
+ SCH_DEC(ds->sch_idx_dec));
+ if (ret < 0)
+ return ret;
+
+ ret = dec_open(ist, d->sch, ds->sch_idx_dec);
if (ret < 0)
return ret;
}
@@ -804,6 +830,7 @@ static int ist_use(InputStream *ist, int decoding_needed)
int ist_output_add(InputStream *ist, OutputStream *ost)
{
+ DemuxStream *ds = ds_from_ist(ist);
int ret;
ret = ist_use(ist, ost->enc ? DECODING_FOR_OST : 0);
@@ -816,11 +843,12 @@ int ist_output_add(InputStream *ist, OutputStream *ost)
ist->outputs[ist->nb_outputs - 1] = ost;
- return 0;
+ return ost->enc ? ds->sch_idx_dec : ds->sch_idx_stream;
}
int ist_filter_add(InputStream *ist, InputFilter *ifilter, int is_simple)
{
+ DemuxStream *ds = ds_from_ist(ist);
int ret;
ret = ist_use(ist, is_simple ? DECODING_FOR_OST : DECODING_FOR_FILTER);
@@ -838,7 +866,7 @@ int ist_filter_add(InputStream *ist, InputFilter *ifilter, int is_simple)
if (ret < 0)
return ret;
- return 0;
+ return ds->sch_idx_dec;
}
static int choose_decoder(const OptionsContext *o, AVFormatContext *s, AVStream *st,
@@ -970,6 +998,9 @@ static DemuxStream *demux_stream_alloc(Demuxer *d, AVStream *st)
if (!ds)
return NULL;
+ ds->sch_idx_stream = -1;
+ ds->sch_idx_dec = -1;
+
ds->ist.st = st;
ds->ist.file_index = f->index;
ds->ist.index = st->index;
@@ -1295,7 +1326,7 @@ static Demuxer *demux_alloc(void)
return d;
}
-int ifile_open(const OptionsContext *o, const char *filename)
+int ifile_open(const OptionsContext *o, const char *filename, Scheduler *sch)
{
Demuxer *d;
InputFile *f;
@@ -1322,6 +1353,11 @@ int ifile_open(const OptionsContext *o, const char *filename)
f = &d->f;
+ ret = sch_add_demux(sch, input_thread, d);
+ if (ret < 0)
+ return ret;
+ d->sch = sch;
+
if (stop_time != INT64_MAX && recording_time != INT64_MAX) {
stop_time = INT64_MAX;
av_log(d, AV_LOG_WARNING, "-t and -to cannot be used together; using -t.\n");
diff --git a/fftools/ffmpeg_enc.c b/fftools/ffmpeg_enc.c
index 46c21fc0e4..9871381c0e 100644
--- a/fftools/ffmpeg_enc.c
+++ b/fftools/ffmpeg_enc.c
@@ -56,6 +56,9 @@ struct Encoder {
int opened;
int finished;
+ Scheduler *sch;
+ unsigned sch_idx;
+
pthread_t thread;
/**
* Queue for sending frames from the main thread to
@@ -113,7 +116,8 @@ void enc_free(Encoder **penc)
av_freep(penc);
}
-int enc_alloc(Encoder **penc, const AVCodec *codec)
+int enc_alloc(Encoder **penc, const AVCodec *codec,
+ Scheduler *sch, unsigned sch_idx)
{
Encoder *enc;
@@ -133,6 +137,9 @@ int enc_alloc(Encoder **penc, const AVCodec *codec)
if (!enc->pkt)
goto fail;
+ enc->sch = sch;
+ enc->sch_idx = sch_idx;
+
*penc = enc;
return 0;
@@ -217,8 +224,6 @@ static int set_encoder_id(OutputFile *of, OutputStream *ost)
return 0;
}
-static void *encoder_thread(void *arg);
-
static int enc_thread_start(OutputStream *ost)
{
Encoder *e = ost->enc;
@@ -1001,7 +1006,7 @@ fail:
return AVERROR(ENOMEM);
}
-static void *encoder_thread(void *arg)
+void *encoder_thread(void *arg)
{
OutputStream *ost = arg;
OutputFile *of = output_files[ost->file_index];
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index d93fc74e07..635b1b0b6e 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -65,6 +65,9 @@ typedef struct FilterGraphPriv {
// frame for sending output to the encoder
AVFrame *frame_enc;
+ Scheduler *sch;
+ unsigned sch_idx;
+
pthread_t thread;
/**
* Queue for sending frames from the main thread to the filtergraph. Has
@@ -735,14 +738,19 @@ static int ifilter_bind_ist(InputFilter *ifilter, InputStream *ist)
{
InputFilterPriv *ifp = ifp_from_ifilter(ifilter);
FilterGraphPriv *fgp = fgp_from_fg(ifilter->graph);
- int ret;
+ int ret, dec_idx;
av_assert0(!ifp->ist);
ifp->ist = ist;
ifp->type_src = ist->st->codecpar->codec_type;
- ret = ist_filter_add(ist, ifilter, filtergraph_is_simple(ifilter->graph));
+ dec_idx = ist_filter_add(ist, ifilter, filtergraph_is_simple(ifilter->graph));
+ if (dec_idx < 0)
+ return dec_idx;
+
+ ret = sch_connect(fgp->sch, SCH_DEC(dec_idx),
+ SCH_FILTER_IN(fgp->sch_idx, ifp->index));
if (ret < 0)
return ret;
@@ -798,13 +806,15 @@ static int set_channel_layout(OutputFilterPriv *f, OutputStream *ost)
return 0;
}
-int ofilter_bind_ost(OutputFilter *ofilter, OutputStream *ost)
+int ofilter_bind_ost(OutputFilter *ofilter, OutputStream *ost,
+ unsigned sched_idx_enc)
{
const OutputFile *of = output_files[ost->file_index];
OutputFilterPriv *ofp = ofp_from_ofilter(ofilter);
FilterGraph *fg = ofilter->graph;
FilterGraphPriv *fgp = fgp_from_fg(fg);
const AVCodec *c = ost->enc_ctx->codec;
+ int ret;
av_assert0(!ofilter->ost);
@@ -887,6 +897,11 @@ int ofilter_bind_ost(OutputFilter *ofilter, OutputStream *ost)
break;
}
+ ret = sch_connect(fgp->sch, SCH_FILTER_OUT(fgp->sch_idx, ofp->index),
+ SCH_ENC(sched_idx_enc));
+ if (ret < 0)
+ return ret;
+
fgp->nb_outputs_bound++;
av_assert0(fgp->nb_outputs_bound <= fg->nb_outputs);
@@ -1016,7 +1031,7 @@ static const AVClass fg_class = {
.category = AV_CLASS_CATEGORY_FILTER,
};
-int fg_create(FilterGraph **pfg, char *graph_desc)
+int fg_create(FilterGraph **pfg, char *graph_desc, Scheduler *sch)
{
FilterGraphPriv *fgp;
FilterGraph *fg;
@@ -1037,6 +1052,7 @@ int fg_create(FilterGraph **pfg, char *graph_desc)
fg->index = nb_filtergraphs - 1;
fgp->graph_desc = graph_desc;
fgp->disable_conversions = !auto_conversion_filters;
+ fgp->sch = sch;
snprintf(fgp->log_name, sizeof(fgp->log_name), "fc#%d", fg->index);
@@ -1104,6 +1120,12 @@ int fg_create(FilterGraph **pfg, char *graph_desc)
goto fail;
}
+ ret = sch_add_filtergraph(sch, fg->nb_inputs, fg->nb_outputs,
+ filter_thread, fgp);
+ if (ret < 0)
+ goto fail;
+ fgp->sch_idx = ret;
+
fail:
avfilter_inout_free(&inputs);
avfilter_inout_free(&outputs);
@@ -1116,13 +1138,14 @@ fail:
}
int init_simple_filtergraph(InputStream *ist, OutputStream *ost,
- char *graph_desc)
+ char *graph_desc,
+ Scheduler *sch, unsigned sched_idx_enc)
{
FilterGraph *fg;
FilterGraphPriv *fgp;
int ret;
- ret = fg_create(&fg, graph_desc);
+ ret = fg_create(&fg, graph_desc, sch);
if (ret < 0)
return ret;
fgp = fgp_from_fg(fg);
@@ -1148,7 +1171,7 @@ int init_simple_filtergraph(InputStream *ist, OutputStream *ost,
if (ret < 0)
return ret;
- ret = ofilter_bind_ost(fg->outputs[0], ost);
+ ret = ofilter_bind_ost(fg->outputs[0], ost, sched_idx_enc);
if (ret < 0)
return ret;
diff --git a/fftools/ffmpeg_mux.c b/fftools/ffmpeg_mux.c
index 57fb8a8413..ef5c2f60e0 100644
--- a/fftools/ffmpeg_mux.c
+++ b/fftools/ffmpeg_mux.c
@@ -297,7 +297,7 @@ fail:
return AVERROR(ENOMEM);
}
-static void *muxer_thread(void *arg)
+void *muxer_thread(void *arg)
{
Muxer *mux = arg;
OutputFile *of = &mux->of;
@@ -580,7 +580,9 @@ static int thread_start(Muxer *mux)
return 0;
}
-static int print_sdp(void)
+int print_sdp(const char *filename);
+
+int print_sdp(const char *filename)
{
char sdp[16384];
int i;
@@ -613,19 +615,18 @@ static int print_sdp(void)
if (ret < 0)
goto fail;
- if (!sdp_filename) {
+ if (!filename) {
printf("SDP:\n%s\n", sdp);
fflush(stdout);
} else {
- ret = avio_open2(&sdp_pb, sdp_filename, AVIO_FLAG_WRITE, &int_cb, NULL);
+ ret = avio_open2(&sdp_pb, 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);
+ av_log(NULL, AV_LOG_ERROR, "Failed to open sdp file '%s'\n", filename);
goto fail;
}
avio_print(sdp_pb, sdp);
avio_closep(&sdp_pb);
- av_freep(&sdp_filename);
}
// SDP successfully written, allow muxer threads to start
@@ -661,7 +662,7 @@ int mux_check_init(Muxer *mux)
nb_output_dumped++;
if (sdp_filename || want_sdp) {
- ret = print_sdp();
+ ret = print_sdp(sdp_filename);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error writing the SDP.\n");
return ret;
@@ -984,6 +985,8 @@ void of_free(OutputFile **pof)
ost_free(&of->streams[i]);
av_freep(&of->streams);
+ av_freep(&mux->sch_stream_idx);
+
av_dict_free(&mux->opts);
av_packet_free(&mux->sq_pkt);
diff --git a/fftools/ffmpeg_mux.h b/fftools/ffmpeg_mux.h
index a2bb4dfc7d..eee2b2cb07 100644
--- a/fftools/ffmpeg_mux.h
+++ b/fftools/ffmpeg_mux.h
@@ -24,6 +24,7 @@
#include <stdatomic.h>
#include <stdint.h>
+#include "ffmpeg_sched.h"
#include "thread_queue.h"
#include "libavformat/avformat.h"
@@ -50,6 +51,10 @@ typedef struct MuxStream {
EncStats stats;
+ int sch_idx;
+ int sch_idx_enc;
+ int sch_idx_src;
+
int64_t max_frames;
/*
@@ -94,6 +99,13 @@ typedef struct Muxer {
AVFormatContext *fc;
+ Scheduler *sch;
+ unsigned sch_idx;
+
+ // OutputStream indices indexed by scheduler stream indices
+ int *sch_stream_idx;
+ int nb_sch_stream_idx;
+
pthread_t thread;
ThreadQueue *tq;
diff --git a/fftools/ffmpeg_mux_init.c b/fftools/ffmpeg_mux_init.c
index 63a25a350f..534b4379c7 100644
--- a/fftools/ffmpeg_mux_init.c
+++ b/fftools/ffmpeg_mux_init.c
@@ -23,6 +23,7 @@
#include "cmdutils.h"
#include "ffmpeg.h"
#include "ffmpeg_mux.h"
+#include "ffmpeg_sched.h"
#include "fopen_utf8.h"
#include "libavformat/avformat.h"
@@ -436,6 +437,9 @@ static MuxStream *mux_stream_alloc(Muxer *mux, enum AVMediaType type)
ms->ost.class = &output_stream_class;
+ ms->sch_idx = -1;
+ ms->sch_idx_enc = -1;
+
snprintf(ms->log_name, sizeof(ms->log_name), "%cost#%d:%d",
type_str ? *type_str : '?', mux->of.index, ms->ost.index);
@@ -1127,6 +1131,22 @@ static int ost_add(Muxer *mux, const OptionsContext *o, enum AVMediaType type,
if (!ms)
return AVERROR(ENOMEM);
+ // only streams with sources (i.e. not attachments)
+ // are handled by the scheduler
+ if (ist || ofilter) {
+ ret = GROW_ARRAY(mux->sch_stream_idx, mux->nb_sch_stream_idx);
+ if (ret < 0)
+ return ret;
+
+ ret = sch_add_mux_stream(mux->sch, mux->sch_idx);
+ if (ret < 0)
+ return ret;
+
+ av_assert0(ret == mux->nb_sch_stream_idx - 1);
+ mux->sch_stream_idx[ret] = ms->ost.index;
+ ms->sch_idx = ret;
+ }
+
ost = &ms->ost;
if (o->streamid) {
@@ -1170,7 +1190,12 @@ static int ost_add(Muxer *mux, const OptionsContext *o, enum AVMediaType type,
if (!ost->enc_ctx)
return AVERROR(ENOMEM);
- ret = enc_alloc(&ost->enc, enc);
+ ret = sch_add_enc(mux->sch, encoder_thread, ost, NULL);
+ if (ret < 0)
+ return ret;
+ ms->sch_idx_enc = ret;
+
+ ret = enc_alloc(&ost->enc, enc, mux->sch, ms->sch_idx_enc);
if (ret < 0)
return ret;
@@ -1380,11 +1405,19 @@ static int ost_add(Muxer *mux, const OptionsContext *o, enum AVMediaType type,
ost->enc_ctx->global_quality = FF_QP2LAMBDA * qscale;
}
- ms->max_muxing_queue_size = 128;
- MATCH_PER_STREAM_OPT(max_muxing_queue_size, i, ms->max_muxing_queue_size, oc, st);
+ if (ms->sch_idx >= 0) {
+ int max_muxing_queue_size = 128;
+ int muxing_queue_data_threshold = 50 * 1024 * 1024;
+
+ MATCH_PER_STREAM_OPT(max_muxing_queue_size, i, max_muxing_queue_size, oc, st);
+ MATCH_PER_STREAM_OPT(muxing_queue_data_threshold, i, muxing_queue_data_threshold, oc, st);
+
+ sch_mux_stream_buffering(mux->sch, mux->sch_idx, ms->sch_idx,
+ max_muxing_queue_size, muxing_queue_data_threshold);
- ms->muxing_queue_data_threshold = 50*1024*1024;
- MATCH_PER_STREAM_OPT(muxing_queue_data_threshold, i, ms->muxing_queue_data_threshold, oc, st);
+ ms->max_muxing_queue_size = max_muxing_queue_size;
+ ms->muxing_queue_data_threshold = muxing_queue_data_threshold;
+ }
MATCH_PER_STREAM_OPT(bits_per_raw_sample, i, ost->bits_per_raw_sample,
oc, st);
@@ -1425,23 +1458,47 @@ static int ost_add(Muxer *mux, const OptionsContext *o, enum AVMediaType type,
(type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)) {
if (ofilter) {
ost->filter = ofilter;
- ret = ofilter_bind_ost(ofilter, ost);
+ ret = ofilter_bind_ost(ofilter, ost, ms->sch_idx_enc);
if (ret < 0)
return ret;
} else {
- ret = init_simple_filtergraph(ost->ist, ost, filters);
+ ret = init_simple_filtergraph(ost->ist, ost, filters,
+ mux->sch, ms->sch_idx_enc);
if (ret < 0) {
av_log(ost, AV_LOG_ERROR,
"Error initializing a simple filtergraph\n");
return ret;
}
}
+
+ ret = sch_connect(mux->sch, SCH_ENC(ms->sch_idx_enc),
+ SCH_MSTREAM(mux->sch_idx, ms->sch_idx));
+ if (ret < 0)
+ return ret;
} else if (ost->ist) {
- ret = ist_output_add(ost->ist, ost);
- if (ret < 0) {
+ int sched_idx = ist_output_add(ost->ist, ost);
+ if (sched_idx < 0) {
av_log(ost, AV_LOG_ERROR,
"Error binding an input stream\n");
- return ret;
+ return sched_idx;
+ }
+ ms->sch_idx_src = sched_idx;
+
+ if (ost->enc) {
+ ret = sch_connect(mux->sch, SCH_DEC(sched_idx),
+ SCH_ENC(ms->sch_idx_enc));
+ if (ret < 0)
+ return ret;
+
+ ret = sch_connect(mux->sch, SCH_ENC(ms->sch_idx_enc),
+ SCH_MSTREAM(mux->sch_idx, ms->sch_idx));
+ if (ret < 0)
+ return ret;
+ } else {
+ ret = sch_connect(mux->sch, SCH_DSTREAM(ost->ist->file_index, sched_idx),
+ SCH_MSTREAM(ost->file_index, ms->sch_idx));
+ if (ret < 0)
+ return ret;
}
}
@@ -1837,6 +1894,26 @@ static int create_streams(Muxer *mux, const OptionsContext *o)
if (ret < 0)
return ret;
+ // setup fix_sub_duration_heartbeat mappings
+ for (unsigned i = 0; i < oc->nb_streams; i++) {
+ MuxStream *src = ms_from_ost(mux->of.streams[i]);
+
+ if (!src->ost.fix_sub_duration_heartbeat)
+ continue;
+
+ for (unsigned j = 0; j < oc->nb_streams; j++) {
+ MuxStream *dst = ms_from_ost(mux->of.streams[j]);
+
+ if (src == dst || dst->ost.type != AVMEDIA_TYPE_SUBTITLE ||
+ !dst->ost.enc || !dst->ost.ist || !dst->ost.ist->fix_sub_duration)
+ continue;
+
+ ret = sch_mux_sub_heartbeat_add(mux->sch, mux->sch_idx, src->sch_idx,
+ dst->sch_idx_src);
+
+ }
+ }
+
if (!oc->nb_streams && !(oc->oformat->flags & AVFMT_NOSTREAMS)) {
av_dump_format(oc, nb_output_files - 1, oc->url, 1);
av_log(mux, AV_LOG_ERROR, "Output file does not contain any stream\n");
@@ -2621,7 +2698,7 @@ static Muxer *mux_alloc(void)
return mux;
}
-int of_open(const OptionsContext *o, const char *filename)
+int of_open(const OptionsContext *o, const char *filename, Scheduler *sch)
{
Muxer *mux;
AVFormatContext *oc;
@@ -2691,6 +2768,13 @@ int of_open(const OptionsContext *o, const char *filename)
AVFMT_FLAG_BITEXACT);
}
+ err = sch_add_mux(sch, muxer_thread, NULL, mux,
+ !strcmp(oc->oformat->name, "rtp"));
+ if (err < 0)
+ return err;
+ mux->sch = sch;
+ mux->sch_idx = err;
+
/* create all output streams for this file */
err = create_streams(mux, o);
if (err < 0)
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 304471dd03..d463306546 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -28,6 +28,7 @@
#endif
#include "ffmpeg.h"
+#include "ffmpeg_sched.h"
#include "cmdutils.h"
#include "opt_common.h"
#include "sync_queue.h"
@@ -1157,20 +1158,22 @@ static int opt_audio_qscale(void *optctx, const char *opt, const char *arg)
static int opt_filter_complex(void *optctx, const char *opt, const char *arg)
{
+ Scheduler *sch = optctx;
char *graph_desc = av_strdup(arg);
if (!graph_desc)
return AVERROR(ENOMEM);
- return fg_create(NULL, graph_desc);
+ return fg_create(NULL, graph_desc, sch);
}
static int opt_filter_complex_script(void *optctx, const char *opt, const char *arg)
{
+ Scheduler *sch = optctx;
char *graph_desc = file_read(arg);
if (!graph_desc)
return AVERROR(EINVAL);
- return fg_create(NULL, graph_desc);
+ return fg_create(NULL, graph_desc, sch);
}
void show_help_default(const char *opt, const char *arg)
@@ -1262,8 +1265,9 @@ static const OptionGroupDef groups[] = {
[GROUP_INFILE] = { "input url", "i", OPT_INPUT },
};
-static int open_files(OptionGroupList *l, const char *inout,
- int (*open_file)(const OptionsContext*, const char*))
+static int open_files(OptionGroupList *l, const char *inout, Scheduler *sch,
+ int (*open_file)(const OptionsContext*, const char*,
+ Scheduler*))
{
int i, ret;
@@ -1283,7 +1287,7 @@ static int open_files(OptionGroupList *l, const char *inout,
}
av_log(NULL, AV_LOG_DEBUG, "Opening an %s file: %s.\n", inout, g->arg);
- ret = open_file(&o, g->arg);
+ ret = open_file(&o, g->arg, sch);
uninit_options(&o);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error opening %s file %s.\n",
@@ -1296,7 +1300,7 @@ static int open_files(OptionGroupList *l, const char *inout,
return 0;
}
-int ffmpeg_parse_options(int argc, char **argv)
+int ffmpeg_parse_options(int argc, char **argv, Scheduler *sch)
{
OptionParseContext octx;
const char *errmsg = NULL;
@@ -1313,7 +1317,7 @@ int ffmpeg_parse_options(int argc, char **argv)
}
/* apply global options */
- ret = parse_optgroup(NULL, &octx.global_opts);
+ ret = parse_optgroup(sch, &octx.global_opts);
if (ret < 0) {
errmsg = "parsing global options";
goto fail;
@@ -1323,7 +1327,7 @@ int ffmpeg_parse_options(int argc, char **argv)
term_init();
/* open input files */
- ret = open_files(&octx.groups[GROUP_INFILE], "input", ifile_open);
+ ret = open_files(&octx.groups[GROUP_INFILE], "input", sch, ifile_open);
if (ret < 0) {
errmsg = "opening input files";
goto fail;
@@ -1337,7 +1341,7 @@ int ffmpeg_parse_options(int argc, char **argv)
}
/* open output files */
- ret = open_files(&octx.groups[GROUP_OUTFILE], "output", of_open);
+ ret = open_files(&octx.groups[GROUP_OUTFILE], "output", sch, of_open);
if (ret < 0) {
errmsg = "opening output files";
goto fail;
diff --git a/fftools/ffmpeg_sched.c b/fftools/ffmpeg_sched.c
new file mode 100644
index 0000000000..69f8c0c3c0
--- /dev/null
+++ b/fftools/ffmpeg_sched.c
@@ -0,0 +1,2218 @@
+/*
+ * Inter-thread scheduling/synchronization.
+ * Copyright (c) 2023 Anton Khirnov
+ *
+ * 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 <stddef.h>
+#include <stdint.h>
+
+#include "cmdutils.h"
+#include "ffmpeg_sched.h"
+#include "ffmpeg_utils.h"
+#include "sync_queue.h"
+#include "thread_queue.h"
+
+#include "libavcodec/packet.h"
+
+#include "libavutil/avassert.h"
+#include "libavutil/error.h"
+#include "libavutil/fifo.h"
+#include "libavutil/frame.h"
+#include "libavutil/mem.h"
+#include "libavutil/thread.h"
+#include "libavutil/threadmessage.h"
+#include "libavutil/time.h"
+
+// 100 ms
+// FIXME: some other value? make this dynamic?
+#define SCHEDULE_TOLERANCE (100 * 1000)
+
+enum QueueType {
+ QUEUE_PACKETS,
+ QUEUE_FRAMES,
+};
+
+typedef struct SchWaiter {
+ pthread_mutex_t lock;
+ pthread_cond_t cond;
+ atomic_int choked;
+
+ // the following are internal state of schedule_update_locked() and must not
+ // be accessed outside of it
+ int choked_prev;
+ int choked_next;
+} SchWaiter;
+
+typedef struct SchTask {
+ Scheduler *parent;
+ SchedulerNode node;
+
+ SchThreadFunc func;
+ void *func_arg;
+
+ pthread_t thread;
+ int thread_running;
+} SchTask;
+
+typedef struct SchDec {
+ const AVClass *class;
+
+ SchedulerNode src;
+ SchedulerNode *dst;
+ uint8_t *dst_finished;
+ unsigned nb_dst;
+
+ SchTask task;
+ // Queue for receiving input packets, one stream.
+ ThreadQueue *queue;
+
+ // Queue for sending post-flush end timestamps back to the source
+ AVThreadMessageQueue *queue_end_ts;
+ int expect_end_ts;
+
+ // temporary storage used by sch_dec_send()
+ AVFrame *send_frame;
+} SchDec;
+
+typedef struct SchSyncQueue {
+ SyncQueue *sq;
+ AVFrame *frame;
+ pthread_mutex_t lock;
+
+ unsigned *enc_idx;
+ unsigned nb_enc_idx;
+} SchSyncQueue;
+
+typedef struct SchEnc {
+ const AVClass *class;
+
+ SchedulerNode src;
+ SchedulerNode dst;
+
+ // [0] - index of the sync queue in Scheduler.sq_enc,
+ // [1] - index of this encoder in the sq
+ int sq_idx[2];
+
+ /* Opening encoders is somewhat nontrivial due to their interaction with
+ * sync queues, which are (among other things) responsible for maintaining
+ * constant audio frame size, when it is required by the encoder.
+ *
+ * Opening the encoder requires stream parameters, obtained from the first
+ * frame. However, that frame cannot be properly chunked by the sync queue
+ * without knowing the required frame size, which is only available after
+ * opening the encoder.
+ *
+ * This apparent circular dependency is resolved in the following way:
+ * - the caller creating the encoder gives us a callback which opens the
+ * encoder and returns the required frame size (if any)
+ * - when the first frame is sent to the encoder, the sending thread
+ * - calls this callback, opening the encoder
+ * - passes the returned frame size to the sync queue
+ */
+ int (*open_cb)(void *opaque, const AVFrame *frame);
+ int opened;
+
+ SchTask task;
+ // Queue for receiving input frames, one stream.
+ ThreadQueue *queue;
+ // tq_send() to queue returned EOF
+ int in_finished;
+ int out_finished;
+} SchEnc;
+
+typedef struct SchDemuxStream {
+ SchedulerNode *dst;
+ uint8_t *dst_finished;
+ unsigned nb_dst;
+} SchDemuxStream;
+
+typedef struct SchDemux {
+ const AVClass *class;
+
+ SchDemuxStream *streams;
+ unsigned nb_streams;
+
+ SchTask task;
+ SchWaiter waiter;
+
+ // temporary storage used by sch_demux_send()
+ AVPacket *send_pkt;
+
+ // protected by schedule_lock
+ int task_exited;
+} SchDemux;
+
+typedef struct PreMuxQueue {
+ /**
+ * Queue for buffering the packets before the muxer task can be started.
+ */
+ AVFifo *fifo;
+ /**
+ * Maximum number of packets in fifo.
+ */
+ int max_packets;
+ /*
+ * The size of the AVPackets' buffers in queue.
+ * Updated when a packet is either pushed or pulled from the queue.
+ */
+ size_t data_size;
+ /* Threshold after which max_packets will be in effect */
+ size_t data_threshold;
+} PreMuxQueue;
+
+typedef struct SchMuxStream {
+ SchedulerNode src;
+ SchedulerNode src_sched;
+
+ unsigned *sub_heartbeat_dst;
+ unsigned nb_sub_heartbeat_dst;
+
+ PreMuxQueue pre_mux_queue;
+
+ // an EOF was generated while flushing the pre-mux queue
+ int init_eof;
+
+ ////////////////////////////////////////////////////////////
+ // The following are protected by Scheduler.schedule_lock //
+
+ /* dts of the last packet sent to this stream
+ in AV_TIME_BASE_Q */
+ int64_t last_dts;
+ // this stream no longer accepts input
+ int source_finished;
+ ////////////////////////////////////////////////////////////
+} SchMuxStream;
+
+typedef struct SchMux {
+ const AVClass *class;
+
+ SchMuxStream *streams;
+ unsigned nb_streams;
+ unsigned nb_streams_ready;
+
+ int (*init)(void *arg);
+
+ SchTask task;
+ /**
+ * Set to 1 after starting the muxer task and flushing the
+ * pre-muxing queues.
+ * Set either before any tasks have started, or with
+ * Scheduler.mux_ready_lock held.
+ */
+ atomic_int mux_started;
+ ThreadQueue *queue;
+
+ AVPacket *sub_heartbeat_pkt;
+} SchMux;
+
+typedef struct SchFilterIn {
+ SchedulerNode src;
+ SchedulerNode src_sched;
+ int send_finished;
+} SchFilterIn;
+
+typedef struct SchFilterOut {
+ SchedulerNode dst;
+} SchFilterOut;
+
+typedef struct SchFilterGraph {
+ const AVClass *class;
+
+ SchFilterIn *inputs;
+ unsigned nb_inputs;
+ atomic_uint nb_inputs_finished;
+
+ SchFilterOut *outputs;
+ unsigned nb_outputs;
+
+ SchTask task;
+ // input queue, nb_inputs+1 streams
+ // last stream is control
+ ThreadQueue *queue;
+ SchWaiter waiter;
+
+ // protected by schedule_lock
+ unsigned best_input;
+ int task_exited;
+} SchFilterGraph;
+
+struct Scheduler {
+ const AVClass *class;
+
+ SchDemux *demux;
+ unsigned nb_demux;
+
+ SchMux *mux;
+ unsigned nb_mux;
+
+ unsigned nb_mux_ready;
+ pthread_mutex_t mux_ready_lock;
+
+ unsigned nb_mux_done;
+ pthread_mutex_t mux_done_lock;
+ pthread_cond_t mux_done_cond;
+
+
+ SchDec *dec;
+ unsigned nb_dec;
+
+ SchEnc *enc;
+ unsigned nb_enc;
+
+ SchSyncQueue *sq_enc;
+ unsigned nb_sq_enc;
+
+ SchFilterGraph *filters;
+ unsigned nb_filters;
+
+ char *sdp_filename;
+ int sdp_auto;
+
+ int transcode_started;
+ atomic_int terminate;
+ atomic_int task_failed;
+
+ pthread_mutex_t schedule_lock;
+
+ atomic_int_least64_t last_dts;
+};
+
+/**
+ * Wait until this task is allowed to proceed.
+ *
+ * @retval 0 the caller should proceed
+ * @retval 1 the caller should terminate
+ */
+static int waiter_wait(Scheduler *sch, SchWaiter *w)
+{
+ int terminate;
+
+ if (!atomic_load(&w->choked))
+ return 0;
+
+ pthread_mutex_lock(&w->lock);
+
+ while (atomic_load(&w->choked) && !atomic_load(&sch->terminate))
+ pthread_cond_wait(&w->cond, &w->lock);
+
+ terminate = atomic_load(&sch->terminate);
+
+ pthread_mutex_unlock(&w->lock);
+
+ return terminate;
+}
+
+static void waiter_set(SchWaiter *w, int choked)
+{
+ pthread_mutex_lock(&w->lock);
+
+ atomic_store(&w->choked, choked);
+ pthread_cond_signal(&w->cond);
+
+ pthread_mutex_unlock(&w->lock);
+}
+
+static int waiter_init(SchWaiter *w)
+{
+ int ret;
+
+ atomic_init(&w->choked, 0);
+
+ ret = pthread_mutex_init(&w->lock, NULL);
+ if (ret)
+ return AVERROR(ret);
+
+ ret = pthread_cond_init(&w->cond, NULL);
+ if (ret)
+ return AVERROR(ret);
+
+ return 0;
+}
+
+static void waiter_uninit(SchWaiter *w)
+{
+ pthread_mutex_destroy(&w->lock);
+ pthread_cond_destroy(&w->cond);
+}
+
+static int queue_alloc(ThreadQueue **ptq, unsigned nb_streams, unsigned queue_size,
+ enum QueueType type)
+{
+ ThreadQueue *tq;
+ ObjPool *op;
+
+ op = (type == QUEUE_PACKETS) ? objpool_alloc_packets() :
+ objpool_alloc_frames();
+ if (!op)
+ return AVERROR(ENOMEM);
+
+ tq = tq_alloc(nb_streams, queue_size, op,
+ (type == QUEUE_PACKETS) ? pkt_move : frame_move);
+ if (!tq) {
+ objpool_free(&op);
+ return AVERROR(ENOMEM);
+ }
+
+ *ptq = tq;
+ return 0;
+}
+
+static void *task_wrapper(void *arg);
+
+static int task_stop(SchTask *task)
+{
+ int ret;
+ void *thread_ret;
+
+ if (!task->thread_running)
+ return 0;
+
+ ret = pthread_join(task->thread, &thread_ret);
+ av_assert0(ret == 0);
+
+ task->thread_running = 0;
+
+ return (intptr_t)thread_ret;
+}
+
+static int task_start(SchTask *task)
+{
+ int ret;
+
+ av_log(task->func_arg, AV_LOG_VERBOSE, "Starting thread...\n");
+
+ av_assert0(!task->thread_running);
+
+ ret = pthread_create(&task->thread, NULL, task_wrapper, task);
+ if (ret) {
+ av_log(task->func_arg, AV_LOG_ERROR, "pthread_create() failed: %s\n",
+ strerror(ret));
+ return AVERROR(ret);
+ }
+
+ task->thread_running = 1;
+ return 0;
+}
+
+static void task_init(Scheduler *sch, SchTask *task, enum SchedulerNodeType type, unsigned idx,
+ SchThreadFunc func, void *func_arg)
+{
+ task->parent = sch;
+
+ task->node.type = type;
+ task->node.idx = idx;
+
+ task->func = func;
+ task->func_arg = func_arg;
+}
+
+int sch_stop(Scheduler *sch)
+{
+ int ret = 0, err;
+
+ atomic_store(&sch->terminate, 1);
+
+ for (unsigned type = 0; type < 2; type++)
+ for (unsigned i = 0; i < (type ? sch->nb_demux : sch->nb_filters); i++) {
+ SchWaiter *w = type ? &sch->demux[i].waiter : &sch->filters[i].waiter;
+ waiter_set(w, 1);
+ }
+
+ for (unsigned i = 0; i < sch->nb_demux; i++) {
+ SchDemux *d = &sch->demux[i];
+
+ err = task_stop(&d->task);
+ ret = err_merge(ret, err);
+ }
+
+ for (unsigned i = 0; i < sch->nb_dec; i++) {
+ SchDec *dec = &sch->dec[i];
+
+ err = task_stop(&dec->task);
+ ret = err_merge(ret, err);
+ }
+
+ for (unsigned i = 0; i < sch->nb_filters; i++) {
+ SchFilterGraph *fg = &sch->filters[i];
+
+ err = task_stop(&fg->task);
+ ret = err_merge(ret, err);
+ }
+
+ for (unsigned i = 0; i < sch->nb_enc; i++) {
+ SchEnc *enc = &sch->enc[i];
+
+ err = task_stop(&enc->task);
+ ret = err_merge(ret, err);
+ }
+
+ for (unsigned i = 0; i < sch->nb_mux; i++) {
+ SchMux *mux = &sch->mux[i];
+
+ err = task_stop(&mux->task);
+ ret = err_merge(ret, err);
+ }
+
+ return ret;
+}
+
+void sch_free(Scheduler **psch)
+{
+ Scheduler *sch = *psch;
+
+ if (!sch)
+ return;
+
+ sch_stop(sch);
+
+ for (unsigned i = 0; i < sch->nb_demux; i++) {
+ SchDemux *d = &sch->demux[i];
+
+ for (unsigned j = 0; j < d->nb_streams; j++) {
+ SchDemuxStream *ds = &d->streams[j];
+ av_freep(&ds->dst);
+ av_freep(&ds->dst_finished);
+ }
+ av_freep(&d->streams);
+
+ av_packet_free(&d->send_pkt);
+
+ waiter_uninit(&d->waiter);
+ }
+ av_freep(&sch->demux);
+
+ for (unsigned i = 0; i < sch->nb_mux; i++) {
+ SchMux *mux = &sch->mux[i];
+
+ for (unsigned j = 0; j < mux->nb_streams; j++) {
+ SchMuxStream *ms = &mux->streams[j];
+
+ if (ms->pre_mux_queue.fifo) {
+ AVPacket *pkt;
+ while (av_fifo_read(ms->pre_mux_queue.fifo, &pkt, 1) >= 0)
+ av_packet_free(&pkt);
+ av_fifo_freep2(&ms->pre_mux_queue.fifo);
+ }
+
+ av_freep(&ms->sub_heartbeat_dst);
+ }
+ av_freep(&mux->streams);
+
+ av_packet_free(&mux->sub_heartbeat_pkt);
+
+ tq_free(&mux->queue);
+ }
+ av_freep(&sch->mux);
+
+ for (unsigned i = 0; i < sch->nb_dec; i++) {
+ SchDec *dec = &sch->dec[i];
+
+ tq_free(&dec->queue);
+
+ av_thread_message_queue_free(&dec->queue_end_ts);
+
+ av_freep(&dec->dst);
+ av_freep(&dec->dst_finished);
+
+ av_frame_free(&dec->send_frame);
+ }
+ av_freep(&sch->dec);
+
+ for (unsigned i = 0; i < sch->nb_enc; i++) {
+ SchEnc *enc = &sch->enc[i];
+
+ tq_free(&enc->queue);
+ }
+ av_freep(&sch->enc);
+
+ for (unsigned i = 0; i < sch->nb_sq_enc; i++) {
+ SchSyncQueue *sq = &sch->sq_enc[i];
+ sq_free(&sq->sq);
+ av_frame_free(&sq->frame);
+ pthread_mutex_destroy(&sq->lock);
+ av_freep(&sq->enc_idx);
+ }
+ av_freep(&sch->sq_enc);
+
+ for (unsigned i = 0; i < sch->nb_filters; i++) {
+ SchFilterGraph *fg = &sch->filters[i];
+
+ tq_free(&fg->queue);
+
+ av_freep(&fg->inputs);
+ av_freep(&fg->outputs);
+
+ waiter_uninit(&fg->waiter);
+ }
+ av_freep(&sch->filters);
+
+ av_freep(&sch->sdp_filename);
+
+ pthread_mutex_destroy(&sch->mux_ready_lock);
+
+ pthread_mutex_destroy(&sch->mux_done_lock);
+ pthread_cond_destroy(&sch->mux_done_cond);
+
+ av_freep(psch);
+}
+
+static const AVClass scheduler_class = {
+ .class_name = "Scheduler",
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+Scheduler *sch_alloc(void)
+{
+ Scheduler *sch;
+ int ret;
+
+ sch = av_mallocz(sizeof(*sch));
+ if (!sch)
+ return NULL;
+
+ sch->class = &scheduler_class;
+ sch->sdp_auto = 1;
+
+ ret = pthread_mutex_init(&sch->mux_ready_lock, NULL);
+ if (ret)
+ goto fail;
+
+ ret = pthread_mutex_init(&sch->mux_done_lock, NULL);
+ if (ret)
+ goto fail;
+
+ ret = pthread_cond_init(&sch->mux_done_cond, NULL);
+ if (ret)
+ goto fail;
+
+ return sch;
+fail:
+ sch_free(&sch);
+ return NULL;
+}
+
+int sch_sdp_filename(Scheduler *sch, const char *sdp_filename)
+{
+ av_freep(&sch->sdp_filename);
+ sch->sdp_filename = av_strdup(sdp_filename);
+ return sch->sdp_filename ? 0 : AVERROR(ENOMEM);
+}
+
+static const AVClass sch_mux_class = {
+ .class_name = "SchMux",
+ .version = LIBAVUTIL_VERSION_INT,
+ .parent_log_context_offset = offsetof(SchMux, task.func_arg),
+};
+
+int sch_add_mux(Scheduler *sch, SchThreadFunc func, int (*init)(void *),
+ void *arg, int sdp_auto)
+{
+ const unsigned idx = sch->nb_mux;
+
+ SchMux *mux;
+ int ret;
+
+ ret = GROW_ARRAY(sch->mux, sch->nb_mux);
+ if (ret < 0)
+ return ret;
+
+ mux = &sch->mux[idx];
+ mux->class = &sch_mux_class;
+ mux->init = init;
+
+ task_init(sch, &mux->task, SCH_NODE_TYPE_MUX, idx, func, arg);
+
+ sch->sdp_auto &= sdp_auto;
+
+ return idx;
+}
+
+int sch_add_mux_stream(Scheduler *sch, unsigned mux_idx)
+{
+ SchMux *mux;
+ SchMuxStream *ms;
+ unsigned stream_idx;
+ int ret;
+
+ av_assert0(mux_idx < sch->nb_mux);
+ mux = &sch->mux[mux_idx];
+
+ ret = GROW_ARRAY(mux->streams, mux->nb_streams);
+ if (ret < 0)
+ return ret;
+ stream_idx = mux->nb_streams - 1;
+
+ ms = &mux->streams[stream_idx];
+
+ ms->pre_mux_queue.fifo = av_fifo_alloc2(8, sizeof(AVPacket*), 0);
+ if (!ms->pre_mux_queue.fifo)
+ return AVERROR(ENOMEM);
+
+ ms->last_dts = AV_NOPTS_VALUE;
+
+ return stream_idx;
+}
+
+static const AVClass sch_demux_class = {
+ .class_name = "SchDemux",
+ .version = LIBAVUTIL_VERSION_INT,
+ .parent_log_context_offset = offsetof(SchDemux, task.func_arg),
+};
+
+int sch_add_demux(Scheduler *sch, SchThreadFunc func, void *ctx)
+{
+ const unsigned idx = sch->nb_demux;
+
+ SchDemux *d;
+ int ret;
+
+ ret = GROW_ARRAY(sch->demux, sch->nb_demux);
+ if (ret < 0)
+ return ret;
+
+ d = &sch->demux[idx];
+
+ task_init(sch, &d->task, SCH_NODE_TYPE_DEMUX, idx, func, ctx);
+
+ d->class = &sch_demux_class;
+ d->send_pkt = av_packet_alloc();
+ if (!d->send_pkt)
+ return AVERROR(ENOMEM);
+
+ ret = waiter_init(&d->waiter);
+ if (ret < 0)
+ return ret;
+
+ return idx;
+}
+
+int sch_add_demux_stream(Scheduler *sch, unsigned demux_idx)
+{
+ SchDemux *d;
+ int ret;
+
+ av_assert0(demux_idx < sch->nb_demux);
+ d = &sch->demux[demux_idx];
+
+ ret = GROW_ARRAY(d->streams, d->nb_streams);
+ return ret < 0 ? ret : d->nb_streams - 1;
+}
+
+static const AVClass sch_dec_class = {
+ .class_name = "SchDec",
+ .version = LIBAVUTIL_VERSION_INT,
+ .parent_log_context_offset = offsetof(SchDec, task.func_arg),
+};
+
+int sch_add_dec(Scheduler *sch, SchThreadFunc func, void *ctx,
+ int send_end_ts)
+{
+ const unsigned idx = sch->nb_dec;
+
+ SchDec *dec;
+ int ret;
+
+ ret = GROW_ARRAY(sch->dec, sch->nb_dec);
+ if (ret < 0)
+ return ret;
+
+ dec = &sch->dec[idx];
+
+ task_init(sch, &dec->task, SCH_NODE_TYPE_DEC, idx, func, ctx);
+
+ dec->class = &sch_dec_class;
+ dec->send_frame = av_frame_alloc();
+ if (!dec->send_frame)
+ return AVERROR(ENOMEM);
+
+ ret = queue_alloc(&dec->queue, 1, 1, QUEUE_PACKETS);
+ if (ret < 0)
+ return ret;
+
+ if (send_end_ts) {
+ ret = av_thread_message_queue_alloc(&dec->queue_end_ts, 1, sizeof(Timestamp));
+ if (ret < 0)
+ return ret;
+ }
+
+ return idx;
+}
+
+static const AVClass sch_enc_class = {
+ .class_name = "SchEnc",
+ .version = LIBAVUTIL_VERSION_INT,
+ .parent_log_context_offset = offsetof(SchEnc, task.func_arg),
+};
+
+int sch_add_enc(Scheduler *sch, SchThreadFunc func, void *ctx,
+ int (*open_cb)(void *opaque, const AVFrame *frame))
+{
+ const unsigned idx = sch->nb_enc;
+
+ SchEnc *enc;
+ int ret;
+
+ ret = GROW_ARRAY(sch->enc, sch->nb_enc);
+ if (ret < 0)
+ return ret;
+
+ enc = &sch->enc[idx];
+
+ enc->class = &sch_enc_class;
+ enc->open_cb = open_cb;
+ enc->sq_idx[0] = -1;
+ enc->sq_idx[1] = -1;
+
+ task_init(sch, &enc->task, SCH_NODE_TYPE_ENC, idx, func, ctx);
+
+ ret = queue_alloc(&enc->queue, 1, 1, QUEUE_FRAMES);
+ if (ret < 0)
+ return ret;
+
+ return idx;
+}
+
+static const AVClass sch_fg_class = {
+ .class_name = "SchFilterGraph",
+ .version = LIBAVUTIL_VERSION_INT,
+ .parent_log_context_offset = offsetof(SchFilterGraph, task.func_arg),
+};
+
+int sch_add_filtergraph(Scheduler *sch, unsigned nb_inputs, unsigned nb_outputs,
+ SchThreadFunc func, void *ctx)
+{
+ const unsigned idx = sch->nb_filters;
+
+ SchFilterGraph *fg;
+ int ret;
+
+ ret = GROW_ARRAY(sch->filters, sch->nb_filters);
+ if (ret < 0)
+ return ret;
+ fg = &sch->filters[idx];
+
+ fg->class = &sch_fg_class;
+
+ task_init(sch, &fg->task, SCH_NODE_TYPE_FILTER_IN, idx, func, ctx);
+
+ if (nb_inputs) {
+ fg->inputs = av_calloc(nb_inputs, sizeof(*fg->inputs));
+ if (!fg->inputs)
+ return AVERROR(ENOMEM);
+ fg->nb_inputs = nb_inputs;
+ }
+
+ if (nb_outputs) {
+ fg->outputs = av_calloc(nb_outputs, sizeof(*fg->outputs));
+ if (!fg->outputs)
+ return AVERROR(ENOMEM);
+ fg->nb_outputs = nb_outputs;
+ }
+
+ ret = waiter_init(&fg->waiter);
+ if (ret < 0)
+ return ret;
+
+ ret = queue_alloc(&fg->queue, fg->nb_inputs + 1, 1, QUEUE_FRAMES);
+ if (ret < 0)
+ return ret;
+
+ return idx;
+}
+
+int sch_add_sq_enc(Scheduler *sch, uint64_t buf_size_us, void *logctx)
+{
+ SchSyncQueue *sq;
+ int ret;
+
+ ret = GROW_ARRAY(sch->sq_enc, sch->nb_sq_enc);
+ if (ret < 0)
+ return ret;
+ sq = &sch->sq_enc[sch->nb_sq_enc - 1];
+
+ sq->sq = sq_alloc(SYNC_QUEUE_FRAMES, buf_size_us, logctx);
+ if (!sq->sq)
+ return AVERROR(ENOMEM);
+
+ sq->frame = av_frame_alloc();
+ if (!sq->frame)
+ return AVERROR(ENOMEM);
+
+ ret = pthread_mutex_init(&sq->lock, NULL);
+ if (ret)
+ return AVERROR(ret);
+
+ return sq - sch->sq_enc;
+}
+
+int sch_sq_add_enc(Scheduler *sch, unsigned sq_idx, unsigned enc_idx,
+ int limiting, uint64_t max_frames)
+{
+ SchSyncQueue *sq;
+ SchEnc *enc;
+ int ret;
+
+ av_assert0(sq_idx < sch->nb_sq_enc);
+ sq = &sch->sq_enc[sq_idx];
+
+ av_assert0(enc_idx < sch->nb_enc);
+ enc = &sch->enc[enc_idx];
+
+ ret = GROW_ARRAY(sq->enc_idx, sq->nb_enc_idx);
+ if (ret < 0)
+ return ret;
+ sq->enc_idx[sq->nb_enc_idx - 1] = enc_idx;
+
+ ret = sq_add_stream(sq->sq, limiting);
+ if (ret < 0)
+ return ret;
+
+ enc->sq_idx[0] = sq_idx;
+ enc->sq_idx[1] = ret;
+
+ if (max_frames != INT64_MAX)
+ sq_limit_frames(sq->sq, enc->sq_idx[1], max_frames);
+
+ return 0;
+}
+
+int sch_connect(Scheduler *sch, SchedulerNode src, SchedulerNode dst)
+{
+ int ret;
+
+ switch (src.type) {
+ case SCH_NODE_TYPE_DEMUX: {
+ SchDemuxStream *ds;
+
+ av_assert0(src.idx < sch->nb_demux &&
+ src.idx_stream < sch->demux[src.idx].nb_streams);
+ ds = &sch->demux[src.idx].streams[src.idx_stream];
+
+ ret = GROW_ARRAY(ds->dst, ds->nb_dst);
+ if (ret < 0)
+ return ret;
+
+ ds->dst[ds->nb_dst - 1] = dst;
+
+ // demuxed packets go to decoding or streamcopy
+ switch (dst.type) {
+ case SCH_NODE_TYPE_DEC: {
+ SchDec *dec;
+
+ av_assert0(dst.idx < sch->nb_dec);
+ dec = &sch->dec[dst.idx];
+
+ av_assert0(!dec->src.type);
+ dec->src = src;
+ break;
+ }
+ case SCH_NODE_TYPE_MUX: {
+ SchMuxStream *ms;
+
+ av_assert0(dst.idx < sch->nb_mux &&
+ dst.idx_stream < sch->mux[dst.idx].nb_streams);
+ ms = &sch->mux[dst.idx].streams[dst.idx_stream];
+
+ av_assert0(!ms->src.type);
+ ms->src = src;
+
+ break;
+ }
+ default: av_assert0(0);
+ }
+
+ break;
+ }
+ case SCH_NODE_TYPE_DEC: {
+ SchDec *dec;
+
+ av_assert0(src.idx < sch->nb_dec);
+ dec = &sch->dec[src.idx];
+
+ ret = GROW_ARRAY(dec->dst, dec->nb_dst);
+ if (ret < 0)
+ return ret;
+
+ dec->dst[dec->nb_dst - 1] = dst;
+
+ // decoded frames go to filters or encoding
+ switch (dst.type) {
+ case SCH_NODE_TYPE_FILTER_IN: {
+ SchFilterIn *fi;
+
+ av_assert0(dst.idx < sch->nb_filters &&
+ dst.idx_stream < sch->filters[dst.idx].nb_inputs);
+ fi = &sch->filters[dst.idx].inputs[dst.idx_stream];
+
+ av_assert0(!fi->src.type);
+ fi->src = src;
+ break;
+ }
+ case SCH_NODE_TYPE_ENC: {
+ SchEnc *enc;
+
+ av_assert0(dst.idx < sch->nb_enc);
+ enc = &sch->enc[dst.idx];
+
+ av_assert0(!enc->src.type);
+ enc->src = src;
+ break;
+ }
+ default: av_assert0(0);
+ }
+
+ break;
+ }
+ case SCH_NODE_TYPE_FILTER_OUT: {
+ SchFilterOut *fo;
+ SchEnc *enc;
+
+ av_assert0(src.idx < sch->nb_filters &&
+ src.idx_stream < sch->filters[src.idx].nb_outputs);
+ // filtered frames go to encoding
+ av_assert0(dst.type == SCH_NODE_TYPE_ENC &&
+ dst.idx < sch->nb_enc);
+
+ fo = &sch->filters[src.idx].outputs[src.idx_stream];
+ enc = &sch->enc[dst.idx];
+
+ av_assert0(!fo->dst.type && !enc->src.type);
+ fo->dst = dst;
+ enc->src = src;
+
+ break;
+ }
+ case SCH_NODE_TYPE_ENC: {
+ SchEnc *enc;
+ SchMuxStream *ms;
+
+ av_assert0(src.idx < sch->nb_enc);
+ // encoding packets go to muxing
+ av_assert0(dst.type == SCH_NODE_TYPE_MUX &&
+ dst.idx < sch->nb_mux &&
+ dst.idx_stream < sch->mux[dst.idx].nb_streams);
+ enc = &sch->enc[src.idx];
+ ms = &sch->mux[dst.idx].streams[dst.idx_stream];
+
+ av_assert0(!enc->dst.type && !ms->src.type);
+ enc->dst = dst;
+ ms->src = src;
+
+ break;
+ }
+ default: av_assert0(0);
+ }
+
+ return 0;
+}
+
+static int mux_task_start(SchMux *mux)
+{
+ int ret = 0;
+
+ ret = task_start(&mux->task);
+ if (ret < 0)
+ return ret;
+
+ /* flush the pre-muxing queues */
+ for (unsigned i = 0; i < mux->nb_streams; i++) {
+ SchMuxStream *ms = &mux->streams[i];
+ AVPacket *pkt;
+
+ while (av_fifo_read(ms->pre_mux_queue.fifo, &pkt, 1) >= 0) {
+ if (pkt) {
+ if (!ms->init_eof)
+ ret = tq_send(mux->queue, i, pkt);
+ av_packet_free(&pkt);
+ if (ret == AVERROR_EOF)
+ ms->init_eof = 1;
+ else if (ret < 0)
+ return ret;
+ } else
+ tq_send_finish(mux->queue, i);
+ }
+ }
+
+ atomic_store(&mux->mux_started, 1);
+
+ return 0;
+}
+
+int print_sdp(const char *filename);
+
+static int mux_init(Scheduler *sch, SchMux *mux)
+{
+ int ret;
+
+ ret = mux->init(mux->task.func_arg);
+ if (ret < 0)
+ return ret;
+
+ sch->nb_mux_ready++;
+
+ if (sch->sdp_filename || sch->sdp_auto) {
+ if (sch->nb_mux_ready < sch->nb_mux)
+ return 0;
+
+ ret = print_sdp(sch->sdp_filename);
+ if (ret < 0) {
+ av_log(sch, AV_LOG_ERROR, "Error writing the SDP.\n");
+ return ret;
+ }
+
+ /* SDP is written only after all the muxers are ready, so now we
+ * start ALL the threads */
+ for (unsigned i = 0; i < sch->nb_mux; i++) {
+ ret = mux_task_start(&sch->mux[i]);
+ if (ret < 0)
+ return ret;
+ }
+ } else {
+ ret = mux_task_start(mux);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+void sch_mux_stream_buffering(Scheduler *sch, unsigned mux_idx, unsigned stream_idx,
+ size_t data_threshold, int max_packets)
+{
+ SchMux *mux;
+ SchMuxStream *ms;
+
+ av_assert0(mux_idx < sch->nb_mux);
+ mux = &sch->mux[mux_idx];
+
+ av_assert0(stream_idx < mux->nb_streams);
+ ms = &mux->streams[stream_idx];
+
+ ms->pre_mux_queue.max_packets = max_packets;
+ ms->pre_mux_queue.data_threshold = data_threshold;
+}
+
+int sch_mux_stream_ready(Scheduler *sch, unsigned mux_idx, unsigned stream_idx)
+{
+ SchMux *mux;
+ int ret = 0;
+
+ av_assert0(mux_idx < sch->nb_mux);
+ mux = &sch->mux[mux_idx];
+
+ av_assert0(stream_idx < mux->nb_streams);
+
+ pthread_mutex_lock(&sch->mux_ready_lock);
+
+ av_assert0(mux->nb_streams_ready < mux->nb_streams);
+
+ // this may be called during initialization - do not start
+ // threads before sch_start() is called
+ if (++mux->nb_streams_ready == mux->nb_streams && sch->transcode_started)
+ ret = mux_init(sch, mux);
+
+ pthread_mutex_unlock(&sch->mux_ready_lock);
+
+ return ret;
+}
+
+int sch_mux_sub_heartbeat_add(Scheduler *sch, unsigned mux_idx, unsigned stream_idx,
+ unsigned dec_idx)
+{
+ SchMux *mux;
+ SchMuxStream *ms;
+ int ret = 0;
+
+ av_assert0(mux_idx < sch->nb_mux);
+ mux = &sch->mux[mux_idx];
+
+ av_assert0(stream_idx < mux->nb_streams);
+ ms = &mux->streams[stream_idx];
+
+ ret = GROW_ARRAY(ms->sub_heartbeat_dst, ms->nb_sub_heartbeat_dst);
+ if (ret < 0)
+ return ret;
+
+ av_assert0(dec_idx < sch->nb_dec);
+ ms->sub_heartbeat_dst[ms->nb_sub_heartbeat_dst - 1] = dec_idx;
+
+ if (!mux->sub_heartbeat_pkt) {
+ mux->sub_heartbeat_pkt = av_packet_alloc();
+ if (!mux->sub_heartbeat_pkt)
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+static int64_t trailing_dts(const Scheduler *sch)
+{
+ int64_t min_dts = INT64_MAX;
+
+ for (unsigned i = 0; i < sch->nb_mux; i++) {
+ const SchMux *mux = &sch->mux[i];
+
+ for (unsigned j = 0; j < mux->nb_streams; j++) {
+ const SchMuxStream *ms = &mux->streams[j];
+
+ if (ms->source_finished)
+ continue;
+ if (ms->last_dts == AV_NOPTS_VALUE)
+ return AV_NOPTS_VALUE;
+
+ min_dts = FFMIN(min_dts, ms->last_dts);
+ }
+ }
+
+ return min_dts == INT64_MAX ? AV_NOPTS_VALUE : min_dts;
+}
+
+static void schedule_update_locked(Scheduler *sch)
+{
+ int64_t dts;
+ int have_unchoked;
+
+ // on termination request all waiters are choked,
+ // we are not to unchoke them
+ if (atomic_load(&sch->terminate))
+ return;
+
+ dts = trailing_dts(sch);
+
+ atomic_store(&sch->last_dts, dts);
+
+ // initialize our internal state
+ for (unsigned type = 0; type < 2; type++)
+ for (unsigned i = 0; i < (type ? sch->nb_filters : sch->nb_demux); i++) {
+ SchWaiter *w = type ? &sch->filters[i].waiter : &sch->demux[i].waiter;
+ w->choked_prev = atomic_load(&w->choked);
+ w->choked_next = 1;
+ }
+
+ // figure out the sources that are allowed to proceed
+ for (unsigned i = 0; i < sch->nb_mux; i++) {
+ SchMux *mux = &sch->mux[i];
+
+ for (unsigned j = 0; j < mux->nb_streams; j++) {
+ SchMuxStream *ms = &mux->streams[j];
+ SchDemux *d;
+
+ // unblock sources for output streams that are not finished
+ // and not too far ahead of the trailing stream
+ if (ms->source_finished)
+ continue;
+ if (dts == AV_NOPTS_VALUE && ms->last_dts != AV_NOPTS_VALUE)
+ continue;
+ if (dts != AV_NOPTS_VALUE && ms->last_dts - dts >= SCHEDULE_TOLERANCE)
+ continue;
+
+ // for outputs fed from filtergraphs, consider that filtergraph's
+ // best_input information, in other cases there is a well-defined
+ // source demuxer
+ if (ms->src_sched.type == SCH_NODE_TYPE_FILTER_OUT) {
+ SchFilterGraph *fg = &sch->filters[ms->src_sched.idx];
+ SchFilterIn *fi;
+
+ // the filtergraph contains internal sources and
+ // requested to be scheduled directly
+ if (fg->best_input == fg->nb_inputs) {
+ fg->waiter.choked_next = 0;
+ have_unchoked = 1;
+ continue;
+ }
+
+ fi = &fg->inputs[fg->best_input];
+ d = &sch->demux[fi->src_sched.idx];
+ } else
+ d = &sch->demux[ms->src_sched.idx];
+
+ d->waiter.choked_next = 0;
+ have_unchoked = 1;
+ }
+ }
+
+ // make sure to unchoke at least one source, if still available
+ for (unsigned type = 0; !have_unchoked && type < 2; type++)
+ for (unsigned i = 0; i < (type ? sch->nb_filters : sch->nb_demux); i++) {
+ int exited = type ? sch->filters[i].task_exited : sch->demux[i].task_exited;
+ SchWaiter *w = type ? &sch->filters[i].waiter : &sch->demux[i].waiter;
+ if (!exited) {
+ w->choked_next = 0;
+ have_unchoked = 1;
+ break;
+ }
+ }
+
+
+ for (unsigned type = 0; type < 2; type++)
+ for (unsigned i = 0; i < (type ? sch->nb_filters : sch->nb_demux); i++) {
+ SchWaiter *w = type ? &sch->filters[i].waiter : &sch->demux[i].waiter;
+ if (w->choked_prev != w->choked_next)
+ waiter_set(w, w->choked_next);
+ }
+
+}
+
+int sch_start(Scheduler *sch)
+{
+ int ret;
+
+ sch->transcode_started = 1;
+
+ for (unsigned i = 0; i < sch->nb_mux; i++) {
+ SchMux *mux = &sch->mux[i];
+
+ for (unsigned j = 0; j < mux->nb_streams; j++) {
+ SchMuxStream *ms = &mux->streams[j];
+
+ switch (ms->src.type) {
+ case SCH_NODE_TYPE_ENC: {
+ SchEnc *enc = &sch->enc[ms->src.idx];
+ if (enc->src.type == SCH_NODE_TYPE_DEC) {
+ ms->src_sched = sch->dec[enc->src.idx].src;
+ av_assert0(ms->src_sched.type == SCH_NODE_TYPE_DEMUX);
+ } else {
+ ms->src_sched = enc->src;
+ av_assert0(ms->src_sched.type == SCH_NODE_TYPE_FILTER_OUT);
+ }
+ break;
+ }
+ case SCH_NODE_TYPE_DEMUX:
+ ms->src_sched = ms->src;
+ break;
+ default:
+ av_log(mux, AV_LOG_ERROR,
+ "Muxer stream #%u not connected to a source\n", j);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ ret = queue_alloc(&mux->queue, mux->nb_streams, 1, QUEUE_PACKETS);
+ if (ret < 0)
+ return ret;
+
+ if (mux->nb_streams_ready == mux->nb_streams) {
+ ret = mux_init(sch, mux);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ for (unsigned i = 0; i < sch->nb_enc; i++) {
+ SchEnc *enc = &sch->enc[i];
+
+ if (!enc->src.type) {
+ av_log(enc, AV_LOG_ERROR,
+ "Encoder not connected to a source\n");
+ return AVERROR(EINVAL);
+ }
+ if (!enc->dst.type) {
+ av_log(enc, AV_LOG_ERROR,
+ "Encoder not connected to a sink\n");
+ return AVERROR(EINVAL);
+ }
+
+ ret = task_start(&enc->task);
+ if (ret < 0)
+ return ret;
+ }
+
+ for (unsigned i = 0; i < sch->nb_filters; i++) {
+ SchFilterGraph *fg = &sch->filters[i];
+
+ for (unsigned j = 0; j < fg->nb_inputs; j++) {
+ SchFilterIn *fi = &fg->inputs[j];
+
+ if (!fi->src.type) {
+ av_log(fg, AV_LOG_ERROR,
+ "Filtergraph input %u not connected to a source\n", j);
+ return AVERROR(EINVAL);
+ }
+
+ fi->src_sched = sch->dec[fi->src.idx].src;
+ }
+
+ for (unsigned j = 0; j < fg->nb_outputs; j++) {
+ SchFilterOut *fo = &fg->outputs[j];
+
+ if (!fo->dst.type) {
+ av_log(fg, AV_LOG_ERROR,
+ "Filtergraph %u output %u not connected to a sink\n", i, j);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ ret = task_start(&fg->task);
+ if (ret < 0)
+ return ret;
+ }
+
+ for (unsigned i = 0; i < sch->nb_dec; i++) {
+ SchDec *dec = &sch->dec[i];
+
+ if (!dec->src.type) {
+ av_log(dec, AV_LOG_ERROR,
+ "Decoder not connected to a source\n");
+ return AVERROR(EINVAL);
+ }
+ if (!dec->nb_dst) {
+ av_log(dec, AV_LOG_ERROR,
+ "Decoder not connected to any sink\n");
+ return AVERROR(EINVAL);
+ }
+
+ dec->dst_finished = av_calloc(dec->nb_dst, sizeof(*dec->dst_finished));
+ if (!dec->dst_finished)
+ return AVERROR(ENOMEM);
+
+ ret = task_start(&dec->task);
+ if (ret < 0)
+ return ret;
+ }
+
+ for (unsigned i = 0; i < sch->nb_demux; i++) {
+ SchDemux *d = &sch->demux[i];
+
+ if (!d->nb_streams)
+ continue;
+
+ for (unsigned j = 0; j < d->nb_streams; j++) {
+ SchDemuxStream *ds = &d->streams[j];
+
+ if (!ds->nb_dst) {
+ av_log(d, AV_LOG_ERROR,
+ "Demuxer stream %u not connected to any sink\n", j);
+ return AVERROR(EINVAL);
+ }
+
+ ds->dst_finished = av_calloc(ds->nb_dst, sizeof(*ds->dst_finished));
+ if (!ds->dst_finished)
+ return AVERROR(ENOMEM);
+ }
+
+ ret = task_start(&d->task);
+ if (ret < 0)
+ return ret;
+ }
+
+ pthread_mutex_lock(&sch->schedule_lock);
+ schedule_update_locked(sch);
+ pthread_mutex_unlock(&sch->schedule_lock);
+
+ return 0;
+}
+
+int sch_wait(Scheduler *sch, uint64_t timeout_us, int64_t *transcode_ts)
+{
+ int ret, err;
+
+ // convert delay to absolute timestamp
+ timeout_us += av_gettime();
+
+ pthread_mutex_lock(&sch->mux_done_lock);
+
+ if (sch->nb_mux_done < sch->nb_mux) {
+ struct timespec tv = { .tv_sec = timeout_us / 1000000,
+ .tv_nsec = (timeout_us % 1000000) * 1000 };
+ pthread_cond_timedwait(&sch->mux_done_cond, &sch->mux_done_lock, &tv);
+ }
+
+ ret = sch->nb_mux_done == sch->nb_mux;
+
+ pthread_mutex_unlock(&sch->mux_done_lock);
+
+ *transcode_ts = atomic_load(&sch->last_dts);
+
+ // abort transcoding if any task failed
+ err = atomic_load(&sch->task_failed);
+
+ return ret || err;
+}
+
+static int enc_open(Scheduler *sch, SchEnc *enc, const AVFrame *frame)
+{
+ int ret;
+
+ ret = enc->open_cb(enc->task.func_arg, frame);
+ if (ret < 0)
+ return ret;
+
+ // ret>0 signals audio frame size, which means sync queue must
+ // have been enabled during encoder creation
+ if (ret > 0) {
+ SchSyncQueue *sq;
+
+ av_assert0(enc->sq_idx[0] >= 0);
+ sq = &sch->sq_enc[enc->sq_idx[0]];
+
+ pthread_mutex_lock(&sq->lock);
+
+ sq_frame_samples(sq->sq, enc->sq_idx[1], ret);
+
+ pthread_mutex_unlock(&sq->lock);
+ }
+
+ return 0;
+}
+
+static int send_to_enc_thread(Scheduler *sch, SchEnc *enc, AVFrame *frame)
+{
+ int ret;
+
+ if (!frame) {
+ tq_send_finish(enc->queue, 0);
+ return 0;
+ }
+
+ if (enc->in_finished)
+ return AVERROR_EOF;
+
+ ret = tq_send(enc->queue, 0, frame);
+ if (ret < 0)
+ enc->in_finished = 1;
+
+ return ret;
+}
+
+static int send_to_enc_sq(Scheduler *sch, SchEnc *enc, AVFrame *frame)
+{
+ SchSyncQueue *sq = &sch->sq_enc[enc->sq_idx[0]];
+ int ret = 0;
+
+ // inform the scheduling code that no more input will arrive along this path;
+ // this is necessary because the sync queue may not send an EOF downstream
+ // until other streams finish
+ // TODO: consider a cleaner way of passing this information through
+ // the pipeline
+ if (!frame) {
+ SchMux *mux = &sch->mux[enc->dst.idx];
+ SchMuxStream *ms = &mux->streams[enc->dst.idx_stream];
+
+ pthread_mutex_lock(&sch->schedule_lock);
+
+ ms->source_finished = 1;
+ schedule_update_locked(sch);
+
+ pthread_mutex_unlock(&sch->schedule_lock);
+ }
+
+ pthread_mutex_lock(&sq->lock);
+
+ ret = sq_send(sq->sq, enc->sq_idx[1], SQFRAME(frame));
+ if (ret < 0)
+ goto finish;
+
+ while (1) {
+ SchEnc *enc;
+
+ // TODO: the SQ API should be extended to allow returning EOF
+ // for individual streams
+ ret = sq_receive(sq->sq, -1, SQFRAME(sq->frame));
+ if (ret == AVERROR(EAGAIN)) {
+ ret = 0;
+ goto finish;
+ } else if (ret < 0) {
+ // close all encoders fed from this sync queue
+ for (unsigned i = 0; i < sq->nb_enc_idx; i++) {
+ int err = send_to_enc_thread(sch, &sch->enc[sq->enc_idx[i]], NULL);
+
+ // if the sync queue error is EOF and closing the encoder
+ // produces a more serious error, make sure to pick the latter
+ ret = err_merge((ret == AVERROR_EOF && err < 0) ? 0 : ret, err);
+ }
+ goto finish;
+ }
+
+ enc = &sch->enc[sq->enc_idx[ret]];
+ ret = send_to_enc_thread(sch, enc, sq->frame);
+ if (ret < 0) {
+ av_assert0(ret == AVERROR_EOF);
+ av_frame_unref(sq->frame);
+ sq_send(sq->sq, enc->sq_idx[1], SQFRAME(NULL));
+ continue;
+ }
+ }
+
+finish:
+ pthread_mutex_unlock(&sq->lock);
+
+ return ret;
+}
+
+static int send_to_enc(Scheduler *sch, SchEnc *enc, AVFrame *frame)
+{
+ if (enc->open_cb && frame && !enc->opened) {
+ int ret = enc_open(sch, enc, frame);
+ if (ret < 0)
+ return ret;
+ enc->opened = 1;
+
+ // discard empty frames that only carry encoder init parameters
+ if (!frame->buf[0]) {
+ av_frame_unref(frame);
+ return 0;
+ }
+ }
+
+ return (enc->sq_idx[0] >= 0) ?
+ send_to_enc_sq (sch, enc, frame) :
+ send_to_enc_thread(sch, enc, frame);
+}
+
+static int mux_queue_packet(SchMux *mux, SchMuxStream *ms, AVPacket *pkt)
+{
+ PreMuxQueue *q = &ms->pre_mux_queue;
+ AVPacket *tmp_pkt = NULL;
+ int ret;
+
+ if (!av_fifo_can_write(q->fifo)) {
+ size_t packets = av_fifo_can_read(q->fifo);
+ size_t pkt_size = pkt ? pkt->size : 0;
+ int thresh_reached = (q->data_size + pkt_size) > q->data_threshold;
+ size_t max_packets = thresh_reached ? q->max_packets : SIZE_MAX;
+ size_t new_size = FFMIN(2 * packets, max_packets);
+
+ if (new_size <= packets) {
+ av_log(mux, AV_LOG_ERROR,
+ "Too many packets buffered for output stream.\n");
+ return AVERROR(ENOSPC);
+ }
+ ret = av_fifo_grow2(q->fifo, new_size - packets);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (pkt) {
+ tmp_pkt = av_packet_alloc();
+ if (!tmp_pkt)
+ return AVERROR(ENOMEM);
+
+ av_packet_move_ref(tmp_pkt, pkt);
+ q->data_size += tmp_pkt->size;
+ }
+ av_fifo_write(q->fifo, &tmp_pkt, 1);
+
+ return 0;
+}
+
+static int send_to_mux(Scheduler *sch, SchMux *mux, unsigned stream_idx,
+ AVPacket *pkt)
+{
+ SchMuxStream *ms = &mux->streams[stream_idx];
+ int64_t dts = (pkt && pkt->dts != AV_NOPTS_VALUE) ?
+ av_rescale_q(pkt->dts, pkt->time_base, AV_TIME_BASE_Q) :
+ AV_NOPTS_VALUE;
+
+ // queue the packet if the muxer cannot be started yet
+ if (!atomic_load(&mux->mux_started)) {
+ int queued = 0;
+
+ // the muxer could have started between the above atomic check and
+ // locking the mutex, then this block falls through to normal send path
+ pthread_mutex_lock(&sch->mux_ready_lock);
+
+ if (!atomic_load(&mux->mux_started)) {
+ int ret = mux_queue_packet(mux, ms, pkt);
+ queued = ret < 0 ? ret : 1;
+ }
+
+ pthread_mutex_unlock(&sch->mux_ready_lock);
+
+ if (queued < 0)
+ return queued;
+ else if (queued)
+ goto update_schedule;
+ }
+
+ if (pkt) {
+ int ret;
+
+ if (ms->init_eof)
+ return AVERROR_EOF;
+
+ ret = tq_send(mux->queue, stream_idx, pkt);
+ if (ret < 0)
+ return ret;
+ } else
+ tq_send_finish(mux->queue, stream_idx);
+
+update_schedule:
+ // TODO: use atomics to check whether this changes trailing dts
+ // to avoid locking unnecesarily
+ if (dts != AV_NOPTS_VALUE || !pkt) {
+ pthread_mutex_lock(&sch->schedule_lock);
+
+ if (pkt) ms->last_dts = dts;
+ else ms->source_finished = 1;
+
+ schedule_update_locked(sch);
+
+ pthread_mutex_unlock(&sch->schedule_lock);
+ }
+
+ return 0;
+}
+
+static int
+demux_stream_send_to_dst(Scheduler *sch, const SchedulerNode dst,
+ uint8_t *dst_finished, AVPacket *pkt, unsigned flags)
+{
+ int ret;
+
+ if (*dst_finished)
+ return AVERROR_EOF;
+
+ if (pkt && dst.type == SCH_NODE_TYPE_MUX &&
+ (flags & DEMUX_SEND_STREAMCOPY_EOF)) {
+ av_packet_unref(pkt);
+ pkt = NULL;
+ }
+
+ if (!pkt)
+ goto finish;
+
+ ret = (dst.type == SCH_NODE_TYPE_MUX) ?
+ send_to_mux(sch, &sch->mux[dst.idx], dst.idx_stream, pkt) :
+ tq_send(sch->dec[dst.idx].queue, 0, pkt);
+ if (ret == AVERROR_EOF)
+ goto finish;
+
+ return ret;
+
+finish:
+ if (dst.type == SCH_NODE_TYPE_MUX)
+ send_to_mux(sch, &sch->mux[dst.idx], dst.idx_stream, NULL);
+ else
+ tq_send_finish(sch->dec[dst.idx].queue, 0);
+
+ *dst_finished = 1;
+ return AVERROR_EOF;
+}
+
+static int demux_send_for_stream(Scheduler *sch, SchDemux *d, SchDemuxStream *ds,
+ AVPacket *pkt, unsigned flags)
+{
+ unsigned nb_done = 0;
+
+ for (unsigned i = 0; i < ds->nb_dst; i++) {
+ AVPacket *to_send = pkt;
+ uint8_t *finished = &ds->dst_finished[i];
+
+ int ret;
+
+ // sending a packet consumes it, so make a temporary reference if needed
+ if (pkt && i < ds->nb_dst - 1) {
+ to_send = d->send_pkt;
+
+ ret = av_packet_ref(to_send, pkt);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = demux_stream_send_to_dst(sch, ds->dst[i], finished, to_send, flags);
+ if (to_send)
+ av_packet_unref(to_send);
+ if (ret == AVERROR_EOF)
+ nb_done++;
+ else if (ret < 0)
+ return ret;
+ }
+
+ return (nb_done == ds->nb_dst) ? AVERROR_EOF : 0;
+}
+
+static int demux_flush(Scheduler *sch, SchDemux *d, AVPacket *pkt)
+{
+ Timestamp max_end_ts = (Timestamp){ .ts = AV_NOPTS_VALUE };
+
+ av_assert0(!pkt->buf && !pkt->data && !pkt->side_data_elems);
+
+ for (unsigned i = 0; i < d->nb_streams; i++) {
+ SchDemuxStream *ds = &d->streams[i];
+
+ for (unsigned j = 0; j < ds->nb_dst; j++) {
+ const SchedulerNode *dst = &ds->dst[j];
+ SchDec *dec;
+ int ret;
+
+ if (ds->dst_finished[j] || dst->type != SCH_NODE_TYPE_DEC)
+ continue;
+
+ dec = &sch->dec[dst->idx];
+
+ ret = tq_send(dec->queue, 0, pkt);
+ if (ret < 0)
+ return ret;
+
+ if (dec->queue_end_ts) {
+ Timestamp ts;
+ ret = av_thread_message_queue_recv(dec->queue_end_ts, &ts, 0);
+ if (ret < 0)
+ return ret;
+
+ if (max_end_ts.ts == AV_NOPTS_VALUE ||
+ (ts.ts != AV_NOPTS_VALUE &&
+ av_compare_ts(max_end_ts.ts, max_end_ts.tb, ts.ts, ts.tb) < 0))
+ max_end_ts = ts;
+
+ }
+ }
+ }
+
+ pkt->pts = max_end_ts.ts;
+ pkt->time_base = max_end_ts.tb;
+
+ return 0;
+}
+
+int sch_demux_send(Scheduler *sch, unsigned demux_idx, AVPacket *pkt,
+ unsigned flags)
+{
+ SchDemux *d;
+ int terminate;
+
+ av_assert0(demux_idx < sch->nb_demux);
+ d = &sch->demux[demux_idx];
+
+ terminate = waiter_wait(sch, &d->waiter);
+ if (terminate)
+ return AVERROR_EXIT;
+
+ // flush the downstreams after seek
+ if (pkt->stream_index == -1)
+ return demux_flush(sch, d, pkt);
+
+ av_assert0(pkt->stream_index < d->nb_streams);
+
+ return demux_send_for_stream(sch, d, &d->streams[pkt->stream_index], pkt, flags);
+}
+
+static int demux_done(Scheduler *sch, unsigned demux_idx)
+{
+ SchDemux *d = &sch->demux[demux_idx];
+ int ret = 0;
+
+ for (unsigned i = 0; i < d->nb_streams; i++) {
+ int err = demux_send_for_stream(sch, d, &d->streams[i], NULL, 0);
+ if (err != AVERROR_EOF)
+ ret = err_merge(ret, err);
+ }
+
+ pthread_mutex_lock(&sch->schedule_lock);
+
+ d->task_exited = 1;
+
+ schedule_update_locked(sch);
+
+ pthread_mutex_unlock(&sch->schedule_lock);
+
+ return ret;
+}
+
+int sch_mux_receive(Scheduler *sch, unsigned mux_idx, AVPacket *pkt)
+{
+ SchMux *mux;
+ int ret, stream_idx;
+
+ av_assert0(mux_idx < sch->nb_mux);
+ mux = &sch->mux[mux_idx];
+
+ ret = tq_receive(mux->queue, &stream_idx, pkt);
+ pkt->stream_index = stream_idx;
+ return ret;
+}
+
+void sch_mux_receive_finish(Scheduler *sch, unsigned mux_idx, unsigned stream_idx)
+{
+ SchMux *mux;
+
+ av_assert0(mux_idx < sch->nb_mux);
+ mux = &sch->mux[mux_idx];
+
+ av_assert0(stream_idx < mux->nb_streams);
+ tq_receive_finish(mux->queue, stream_idx);
+
+ pthread_mutex_lock(&sch->schedule_lock);
+ mux->streams[stream_idx].source_finished = 1;
+
+ schedule_update_locked(sch);
+
+ pthread_mutex_unlock(&sch->schedule_lock);
+}
+
+int sch_mux_sub_heartbeat(Scheduler *sch, unsigned mux_idx, unsigned stream_idx,
+ const AVPacket *pkt)
+{
+ SchMux *mux;
+ SchMuxStream *ms;
+
+ av_assert0(mux_idx < sch->nb_mux);
+ mux = &sch->mux[mux_idx];
+
+ av_assert0(stream_idx < mux->nb_streams);
+ ms = &mux->streams[stream_idx];
+
+ for (unsigned i = 0; i < ms->nb_sub_heartbeat_dst; i++) {
+ SchDec *dst = &sch->dec[ms->sub_heartbeat_dst[i]];
+ int ret;
+
+ ret = av_packet_copy_props(mux->sub_heartbeat_pkt, pkt);
+ if (ret < 0)
+ return ret;
+
+ tq_send(dst->queue, 0, mux->sub_heartbeat_pkt);
+ }
+
+ return 0;
+}
+
+static int mux_done(Scheduler *sch, unsigned mux_idx)
+{
+ SchMux *mux = &sch->mux[mux_idx];
+
+ pthread_mutex_lock(&sch->schedule_lock);
+
+ for (unsigned i = 0; i < mux->nb_streams; i++) {
+ tq_receive_finish(mux->queue, i);
+ mux->streams[i].source_finished = 1;
+ }
+
+ schedule_update_locked(sch);
+
+ pthread_mutex_unlock(&sch->schedule_lock);
+
+ pthread_mutex_lock(&sch->mux_done_lock);
+
+ av_assert0(sch->nb_mux_done < sch->nb_mux);
+ sch->nb_mux_done++;
+
+ pthread_cond_signal(&sch->mux_done_cond);
+
+ pthread_mutex_unlock(&sch->mux_done_lock);
+
+ return 0;
+}
+
+int sch_dec_receive(Scheduler *sch, unsigned dec_idx, AVPacket *pkt)
+{
+ SchDec *dec;
+ int ret, dummy;
+
+ av_assert0(dec_idx < sch->nb_dec);
+ dec = &sch->dec[dec_idx];
+
+ // the decoder should have given us post-flush end timestamp in pkt
+ if (dec->expect_end_ts) {
+ Timestamp ts = (Timestamp){ .ts = pkt->pts, .tb = pkt->time_base };
+ ret = av_thread_message_queue_send(dec->queue_end_ts, &ts, 0);
+ if (ret < 0)
+ return ret;
+
+ dec->expect_end_ts = 0;
+ }
+
+ ret = tq_receive(dec->queue, &dummy, pkt);
+ av_assert0(dummy <= 0);
+
+ // got a flush packet, on the next call to this function the decoder
+ // will give us post-flush end timestamp
+ if (ret >= 0 && !pkt->data && !pkt->side_data_elems && dec->queue_end_ts)
+ dec->expect_end_ts = 1;
+
+ return ret;
+}
+
+static int send_to_filter(Scheduler *sch, SchFilterGraph *fg,
+ unsigned in_idx, AVFrame *frame)
+{
+ if (frame)
+ return tq_send(fg->queue, in_idx, frame);
+
+ if (!fg->inputs[in_idx].send_finished) {
+ fg->inputs[in_idx].send_finished = 1;
+ tq_send_finish(fg->queue, in_idx);
+
+ // close the control stream when all actual inputs are done
+ if (atomic_fetch_add(&fg->nb_inputs_finished, 1) == fg->nb_inputs - 1)
+ tq_send_finish(fg->queue, fg->nb_inputs);
+ }
+ return 0;
+}
+
+static int dec_send_to_dst(Scheduler *sch, const SchedulerNode dst,
+ uint8_t *dst_finished, AVFrame *frame)
+{
+ int ret;
+
+ if (*dst_finished)
+ return AVERROR_EOF;
+
+ if (!frame)
+ goto finish;
+
+ ret = (dst.type == SCH_NODE_TYPE_FILTER_IN) ?
+ send_to_filter(sch, &sch->filters[dst.idx], dst.idx_stream, frame) :
+ send_to_enc(sch, &sch->enc[dst.idx], frame);
+ if (ret == AVERROR_EOF)
+ goto finish;
+
+ return ret;
+
+finish:
+ if (dst.type == SCH_NODE_TYPE_FILTER_IN)
+ send_to_filter(sch, &sch->filters[dst.idx], dst.idx_stream, NULL);
+ else
+ send_to_enc(sch, &sch->enc[dst.idx], NULL);
+
+ *dst_finished = 1;
+
+ return AVERROR_EOF;
+}
+
+int sch_dec_send(Scheduler *sch, unsigned dec_idx, AVFrame *frame)
+{
+ SchDec *dec;
+ int ret = 0;
+ unsigned nb_done = 0;
+
+ av_assert0(dec_idx < sch->nb_dec);
+ dec = &sch->dec[dec_idx];
+
+ for (unsigned i = 0; i < dec->nb_dst; i++) {
+ uint8_t *finished = &dec->dst_finished[i];
+ AVFrame *to_send = frame;
+
+ // sending a frame consumes it, so make a temporary reference if needed
+ if (i < dec->nb_dst - 1) {
+ to_send = dec->send_frame;
+
+ // frame may sometimes contain props only,
+ // e.g. to signal EOF timestamp
+ ret = frame->buf[0] ? av_frame_ref(to_send, frame) :
+ av_frame_copy_props(to_send, frame);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = dec_send_to_dst(sch, dec->dst[i], finished, to_send);
+ if (ret < 0) {
+ av_frame_unref(to_send);
+ if (ret == AVERROR_EOF) {
+ nb_done++;
+ ret = 0;
+ continue;
+ }
+ goto finish;
+ }
+ }
+
+finish:
+ return ret < 0 ? ret :
+ (nb_done == dec->nb_dst) ? AVERROR_EOF : 0;
+}
+
+static int dec_done(Scheduler *sch, unsigned dec_idx)
+{
+ SchDec *dec = &sch->dec[dec_idx];
+ int ret = 0;
+
+ tq_receive_finish(dec->queue, 0);
+
+ // make sure our source does not get stuck waiting for end timestamps
+ // that will never arrive
+ if (dec->queue_end_ts)
+ av_thread_message_queue_set_err_recv(dec->queue_end_ts, AVERROR_EOF);
+
+ for (unsigned i = 0; i < dec->nb_dst; i++) {
+ int err = dec_send_to_dst(sch, dec->dst[i], &dec->dst_finished[i], NULL);
+ if (err < 0 && err != AVERROR_EOF)
+ ret = err_merge(ret, err);
+ }
+
+ return ret;
+}
+
+int sch_enc_receive(Scheduler *sch, unsigned enc_idx, AVFrame *frame)
+{
+ SchEnc *enc;
+ int ret, dummy;
+
+ av_assert0(enc_idx < sch->nb_enc);
+ enc = &sch->enc[enc_idx];
+
+ ret = tq_receive(enc->queue, &dummy, frame);
+ av_assert0(dummy <= 0);
+
+ return ret;
+}
+
+int sch_enc_send(Scheduler *sch, unsigned enc_idx, AVPacket *pkt)
+{
+ SchEnc *enc;
+ int ret;
+
+ av_assert0(enc_idx < sch->nb_enc);
+ enc = &sch->enc[enc_idx];
+
+ if (enc->out_finished)
+ return pkt ? AVERROR_EOF : 0;
+
+ ret = send_to_mux(sch, &sch->mux[enc->dst.idx], enc->dst.idx_stream, pkt);
+ if (ret < 0)
+ enc->out_finished = 1;
+
+ return ret;
+}
+
+static int enc_done(Scheduler *sch, unsigned enc_idx)
+{
+ SchEnc *enc = &sch->enc[enc_idx];
+
+ tq_receive_finish(enc->queue, 0);
+
+ return send_to_mux(sch, &sch->mux[enc->dst.idx], enc->dst.idx_stream, NULL);
+}
+
+int sch_filter_receive(Scheduler *sch, unsigned fg_idx,
+ unsigned *in_idx, AVFrame *frame)
+{
+ SchFilterGraph *fg;
+
+ av_assert0(fg_idx < sch->nb_filters);
+ fg = &sch->filters[fg_idx];
+
+ av_assert0(*in_idx <= fg->nb_inputs);
+
+ // update scheduling to account for desired input stream, if it changed
+ //
+ // this check needs no locking because only the filtering thread
+ // updates this value
+ if (*in_idx != fg->best_input) {
+ pthread_mutex_lock(&sch->schedule_lock);
+
+ fg->best_input = *in_idx;
+ schedule_update_locked(sch);
+
+ pthread_mutex_unlock(&sch->schedule_lock);
+ }
+
+ if (*in_idx == fg->nb_inputs) {
+ int terminate = waiter_wait(sch, &fg->waiter);
+ return terminate ? AVERROR_EOF : AVERROR(EAGAIN);
+ }
+
+ while (1) {
+ int ret, idx;
+
+ ret = tq_receive(fg->queue, &idx, frame);
+ if (idx < 0)
+ return AVERROR_EOF;
+ else if (ret >= 0) {
+ *in_idx = idx;
+ return 0;
+ }
+
+ // disregard EOFs for specific streams - they should always be
+ // preceded by an EOF frame
+ }
+}
+
+int sch_filter_send(Scheduler *sch, unsigned fg_idx, unsigned out_idx, AVFrame *frame)
+{
+ SchFilterGraph *fg;
+
+ av_assert0(fg_idx < sch->nb_filters);
+ fg = &sch->filters[fg_idx];
+
+ av_assert0(out_idx < fg->nb_outputs);
+ return send_to_enc(sch, &sch->enc[fg->outputs[out_idx].dst.idx], frame);
+}
+
+static int filter_done(Scheduler *sch, unsigned fg_idx)
+{
+ SchFilterGraph *fg = &sch->filters[fg_idx];
+ int ret = 0;
+
+ for (unsigned i = 0; i <= fg->nb_inputs; i++)
+ tq_receive_finish(fg->queue, i);
+
+ for (unsigned i = 0; i < fg->nb_outputs; i++) {
+ SchEnc *enc = &sch->enc[fg->outputs[i].dst.idx];
+ int err = send_to_enc(sch, enc, NULL);
+ if (err < 0 && err != AVERROR_EOF)
+ ret = err_merge(ret, err);
+ }
+
+ pthread_mutex_lock(&sch->schedule_lock);
+
+ fg->task_exited = 1;
+
+ schedule_update_locked(sch);
+
+ pthread_mutex_unlock(&sch->schedule_lock);
+
+ return ret;
+}
+
+int sch_filter_command(Scheduler *sch, unsigned fg_idx, AVFrame *frame)
+{
+ SchFilterGraph *fg;
+
+ av_assert0(fg_idx < sch->nb_filters);
+ fg = &sch->filters[fg_idx];
+
+ return send_to_filter(sch, fg, fg->nb_inputs, frame);
+}
+
+static void *task_wrapper(void *arg)
+{
+ SchTask *task = arg;
+ Scheduler *sch = task->parent;
+ int ret;
+ int err = 0;
+
+ ret = (intptr_t)task->func(task->func_arg);
+ if (ret < 0)
+ av_log(task->func_arg, AV_LOG_ERROR,
+ "Task finished with error code: %d (%s)\n", ret, av_err2str(ret));
+
+ switch (task->node.type) {
+ case SCH_NODE_TYPE_DEMUX: err = demux_done (sch, task->node.idx); break;
+ case SCH_NODE_TYPE_MUX: err = mux_done (sch, task->node.idx); break;
+ case SCH_NODE_TYPE_DEC: err = dec_done (sch, task->node.idx); break;
+ case SCH_NODE_TYPE_ENC: err = enc_done (sch, task->node.idx); break;
+ case SCH_NODE_TYPE_FILTER_IN: err = filter_done(sch, task->node.idx); break;
+ default: av_assert0(0);
+ }
+
+ ret = err_merge(ret, err);
+
+ // EOF is considered normal termination
+ if (ret == AVERROR_EOF)
+ ret = 0;
+ if (ret < 0)
+ atomic_store(&sch->task_failed, 1);
+
+ av_log(task->func_arg, ret < 0 ? AV_LOG_ERROR : AV_LOG_VERBOSE,
+ "Terminating thread with return code %d (%s)\n", ret,
+ ret < 0 ? av_err2str(ret) : "success");
+
+ return (void*)(intptr_t)ret;
+}
diff --git a/fftools/ffmpeg_sched.h b/fftools/ffmpeg_sched.h
new file mode 100644
index 0000000000..94bbd30e98
--- /dev/null
+++ b/fftools/ffmpeg_sched.h
@@ -0,0 +1,468 @@
+/*
+ * Inter-thread scheduling/synchronization.
+ * Copyright (c) 2023 Anton Khirnov
+ *
+ * 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
+ */
+
+#ifndef FFTOOLS_FFMPEG_SCHED_H
+#define FFTOOLS_FFMPEG_SCHED_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "ffmpeg_utils.h"
+
+/*
+ * This file contains the API for the transcode scheduler.
+ *
+ * Overall architecture of the transcoding process involves instances of the
+ * following components:
+ * - demuxers, each containing any number of demuxed streams; demuxed packets
+ * belonging to some stream are sent to any number of decoders (transcoding)
+ * and/or muxers (streamcopy);
+ * - decoders, which receive encoded packets from some demuxed stream, decode
+ * them, and send decoded frames to any number of filtergraph inputs
+ * (audio/video) or encoders (subtitles);
+ * - filtergraphs, each containing zero or more inputs (0 in case the
+ * filtergraph contains a lavfi source filter), and one or more outputs; the
+ * inputs and outputs need not have matching media types;
+ * each filtergraph input receives decoded frames from some decoder;
+ * filtered frames from each output are sent to some encoder;
+ * - encoders, which receive decoded frames from some decoder (subtitles) or
+ * some filtergraph output (audio/video), encode them, and send encoded
+ * packets to some muxed stream;
+ * - muxers, each containing any number of muxed streams; each muxed stream
+ * receives encoded packets from some demuxed stream (streamcopy) or some
+ * encoder (transcoding); those packets are interleaved and written out by the
+ * muxer.
+ *
+ * There must be at least one muxer instance, otherwise the transcode produces
+ * no output and is meaningless. Otherwise, in a generic transcoding scenario
+ * there may be arbitrary number of instances of any of the above components,
+ * interconnected in various ways.
+ *
+ * The code tries to keep all the output streams across all the muxers in sync
+ * (i.e. at the same DTS), which is accomplished by varying the rates at which
+ * packets are read from different demuxers and lavfi sources. Note that the
+ * degree of control we have over synchronization is fundamentally limited - if
+ * some demuxed streams in the same input are interleaved at different rates
+ * than that at which they are to be muxed (e.g. because an input file is badly
+ * interleaved, or the user changed their speed by mismatching amounts), then
+ * there will be increasing amounts of buffering followed by eventual
+ * transcoding failure.
+ *
+ * N.B. 1: there are meaningful transcode scenarios with no demuxers, e.g.
+ * - encoding and muxing output from filtergraph(s) that have no inputs;
+ * - creating a file that contains nothing but attachments and/or metadata.
+ *
+ * N.B. 2: a filtergraph output could, in principle, feed multiple encoders, but
+ * this is unnecessary because the (a)split filter provides the same
+ * functionality.
+ *
+ * The scheduler, in the above model, is the master object that oversees and
+ * facilitates the transcoding process. The basic idea is that all instances
+ * of the abovementioned components communicate only with the scheduler and not
+ * with each other. The scheduler is then the single place containing the
+ * knowledge about the whole transcoding pipeline.
+ */
+
+struct AVFrame;
+struct AVPacket;
+
+typedef struct Scheduler Scheduler;
+
+enum SchedulerNodeType {
+ SCH_NODE_TYPE_NONE = 0,
+ SCH_NODE_TYPE_DEMUX,
+ SCH_NODE_TYPE_MUX,
+ SCH_NODE_TYPE_DEC,
+ SCH_NODE_TYPE_ENC,
+ SCH_NODE_TYPE_FILTER_IN,
+ SCH_NODE_TYPE_FILTER_OUT,
+};
+
+typedef struct SchedulerNode {
+ enum SchedulerNodeType type;
+ unsigned idx;
+ unsigned idx_stream;
+} SchedulerNode;
+
+typedef void* (*SchThreadFunc)(void *arg);
+
+#define SCH_DSTREAM(file, stream) \
+ (SchedulerNode){ .type = SCH_NODE_TYPE_DEMUX, \
+ .idx = file, .idx_stream = stream }
+#define SCH_MSTREAM(file, stream) \
+ (SchedulerNode){ .type = SCH_NODE_TYPE_MUX, \
+ .idx = file, .idx_stream = stream }
+#define SCH_DEC(decoder) \
+ (SchedulerNode){ .type = SCH_NODE_TYPE_DEC, \
+ .idx = decoder }
+#define SCH_ENC(encoder) \
+ (SchedulerNode){ .type = SCH_NODE_TYPE_ENC, \
+ .idx = encoder }
+#define SCH_FILTER_IN(filter, input) \
+ (SchedulerNode){ .type = SCH_NODE_TYPE_FILTER_IN, \
+ .idx = filter, .idx_stream = input }
+#define SCH_FILTER_OUT(filter, output) \
+ (SchedulerNode){ .type = SCH_NODE_TYPE_FILTER_OUT, \
+ .idx = filter, .idx_stream = output }
+
+Scheduler *sch_alloc(void);
+void sch_free(Scheduler **sch);
+
+int sch_start(Scheduler *sch);
+int sch_stop(Scheduler *sch);
+
+/**
+ * Wait until transcoding terminates or the specified timeout elapses.
+ *
+ * @param timeout_us Amount of time in microseconds after which this function
+ * will timeout.
+ * @param transcode_ts Current transcode timestamp in AV_TIME_BASE_Q, for
+ * informational purposes only.
+ *
+ * @retval 0 waiting timed out, transcoding is not finished
+ * @retval 1 transcoding is finished
+ */
+int sch_wait(Scheduler *sch, uint64_t timeout_us, int64_t *transcode_ts);
+
+/**
+ * Add a demuxer to the scheduler.
+ *
+ * @param func Function executed as the demuxer task.
+ * @param ctx Demuxer state; will be passed to func and used for logging.
+ *
+ * @retval ">=0" Index of the newly-created demuxer.
+ * @retval "<0" Error code.
+ */
+int sch_add_demux(Scheduler *sch, SchThreadFunc func, void *ctx);
+/**
+ * Add a demuxed stream for a previously added demuxer.
+ *
+ * @param demux_idx index previously returned by sch_add_demux()
+ *
+ * @retval ">=0" Index of the newly-created demuxed stream.
+ * @retval "<0" Error code.
+ */
+int sch_add_demux_stream(Scheduler *sch, unsigned demux_idx);
+
+/**
+ * Add a decoder to the scheduler.
+ *
+ * @param func Function executed as the decoder task.
+ * @param ctx Decoder state; will be passed to func and used for logging.
+ * @param send_end_ts The decoder will return an end timestamp after flush packets
+ * are delivered to it. See documentation for
+ * sch_dec_receive() for more details.
+ *
+ * @retval ">=0" Index of the newly-created decoder.
+ * @retval "<0" Error code.
+ */
+int sch_add_dec(Scheduler *sch, SchThreadFunc func, void *ctx,
+ int send_end_ts);
+
+/**
+ * Add a filtergraph to the scheduler.
+ *
+ * @param nb_inputs Number of filtergraph inputs.
+ * @param nb_outputs number of filtergraph outputs
+ * @param func Function executed as the filtering task.
+ * @param ctx Filter state; will be passed to func and used for logging.
+ *
+ * @retval ">=0" Index of the newly-created filtergraph.
+ * @retval "<0" Error code.
+ */
+int sch_add_filtergraph(Scheduler *sch, unsigned nb_inputs, unsigned nb_outputs,
+ SchThreadFunc func, void *ctx);
+
+/**
+ * Add a muxer to the scheduler.
+ *
+ * Note that muxer thread startup is more complicated than for other components,
+ * because
+ * - muxer streams fed by audio/video encoders become initialized dynamically at
+ * runtime, after those encoders receive their first frame and initialize
+ * themselves, followed by calling sch_mux_stream_ready()
+ * - the header can be written after all the streams for a muxer are initialized
+ * - we may need to write an SDP, which must happen
+ * - AFTER all the headers are written
+ * - BEFORE any packets are written by any muxer
+ * - with all the muxers quiescent
+ * To avoid complicated muxer-thread synchronization dances, we postpone
+ * starting the muxer threads until after the SDP is written. The sequence of
+ * events is then as follows:
+ * - After sch_mux_stream_ready() is called for all the streams in a given muxer,
+ * the header for that muxer is written (care is taken that headers for
+ * different muxers are not written concurrently, since they write file
+ * information to stderr). If SDP is not wanted, the muxer thread then starts
+ * and muxing begins.
+ * - When SDP _is_ wanted, no muxer threads start until the header for the last
+ * muxer is written. After that, the SDP is written, after which all the muxer
+ * threads are started at once.
+ *
+ * In order for the above to work, the scheduler needs to be able to invoke
+ * just writing the header, which is the reason the init parameter exists.
+ *
+ * @param func Function executed as the muxing task.
+ * @param init Callback that is called to initialize the muxer and write the
+ * header. Called after sch_mux_stream_ready() is called for all the
+ * streams in the muxer.
+ * @param ctx Muxer state; will be passed to func/init and used for logging.
+ * @param sdp_auto Determines automatic SDP writing - see sch_sdp_filename().
+ *
+ * @retval ">=0" Index of the newly-created muxer.
+ * @retval "<0" Error code.
+ */
+int sch_add_mux(Scheduler *sch, SchThreadFunc func, int (*init)(void *),
+ void *ctx, int sdp_auto);
+/**
+ * Add a muxed stream for a previously added muxer.
+ *
+ * @param mux_idx index previously returned by sch_add_mux()
+ *
+ * @retval ">=0" Index of the newly-created muxed stream.
+ * @retval "<0" Error code.
+ */
+int sch_add_mux_stream(Scheduler *sch, unsigned mux_idx);
+
+/**
+ * Configure limits on packet buffering performed before the muxer task is
+ * started.
+ *
+ * @param mux_idx index previously returned by sch_add_mux()
+ * @param stream_idx_idx index previously returned by sch_add_mux_stream()
+ * @param data_threshold Total size of the buffered packets' data after which
+ * max_packets applies.
+ * @param max_packets maximum Maximum number of buffered packets after
+ * data_threshold is reached.
+ */
+void sch_mux_stream_buffering(Scheduler *sch, unsigned mux_idx, unsigned stream_idx,
+ size_t data_threshold, int max_packets);
+
+/**
+ * Signal to the scheduler that the specified muxed stream is initialized and
+ * ready. Muxing is started once all the streams are ready.
+ */
+int sch_mux_stream_ready(Scheduler *sch, unsigned mux_idx, unsigned stream_idx);
+
+/**
+ * Set the file path for the SDP.
+ *
+ * The SDP is written when either of the following is true:
+ * - this function is called at least once
+ * - sdp_auto=1 is passed to EVERY call of sch_add_mux()
+ */
+int sch_sdp_filename(Scheduler *sch, const char *sdp_filename);
+
+/**
+ * Add an encoder to the scheduler.
+ *
+ * @param func Function executed as the encoding task.
+ * @param ctx Encoder state; will be passed to func and used for logging.
+ * @param open_cb This callback, if specified, will be called when the first
+ * frame is obtained for this encoder. For audio encoders with a
+ * fixed frame size (which use a sync queue in the scheduler to
+ * rechunk frames), it must return that frame size on success.
+ * Otherwise (non-audio, variable frame size) it should return 0.
+ *
+ * @retval ">=0" Index of the newly-created encoder.
+ * @retval "<0" Error code.
+ */
+int sch_add_enc(Scheduler *sch, SchThreadFunc func, void *ctx,
+ int (*open_cb)(void *func_arg, const struct AVFrame *frame));
+
+/**
+ * Add an pre-encoding sync queue to the scheduler.
+ *
+ * @param buf_size_us Sync queue buffering size, passed to sq_alloc().
+ * @param logctx Logging context for the sync queue. passed to sq_alloc().
+ *
+ * @retval ">=0" Index of the newly-created sync queue.
+ * @retval "<0" Error code.
+ */
+int sch_add_sq_enc(Scheduler *sch, uint64_t buf_size_us, void *logctx);
+int sch_sq_add_enc(Scheduler *sch, unsigned sq_idx, unsigned enc_idx,
+ int limiting, uint64_t max_frames);
+
+int sch_connect(Scheduler *sch, SchedulerNode src, SchedulerNode dst);
+
+enum DemuxSendFlags {
+ /**
+ * Treat the packet as an EOF for SCH_NODE_TYPE_MUX destinations
+ * send normally to other types.
+ */
+ DEMUX_SEND_STREAMCOPY_EOF = (1 << 0),
+};
+
+/**
+ * Called by demuxer tasks to communicate with their downstreams. The following
+ * may be sent:
+ * - a demuxed packet for the stream identified by pkt->stream_index;
+ * - demuxer discontinuity/reset (e.g. after a seek) - this is signalled by an
+ * empty packet with stream_index=-1.
+ *
+ * @param demux_idx demuxer index
+ * @param pkt A demuxed packet to send.
+ * When flushing (i.e. pkt->stream_index=-1 on entry to this
+ * function), on successful return pkt->pts/pkt->time_base will be
+ * set to the maximum end timestamp of any decoded audio stream, or
+ * AV_NOPTS_VALUE if no decoded audio streams are present.
+ *
+ * @retval "non-negative value" success
+ * @retval AVERROR_EOF all consumers for the stream are done
+ * @retval AVERROR_EXIT all consumers are done, should terminate demuxing
+ * @retval "anoter negative error code" other failure
+ */
+int sch_demux_send(Scheduler *sch, unsigned demux_idx, struct AVPacket *pkt,
+ unsigned flags);
+
+/**
+ * Called by decoder tasks to receive a packet for decoding.
+ *
+ * @param dec_idx decoder index
+ * @param pkt Input packet will be written here on success.
+ *
+ * An empty packet signals that the decoder should be flushed, but
+ * more packets will follow (e.g. after seeking). When a decoder
+ * created with send_end_ts=1 receives a flush packet, it must write
+ * the end timestamp of the stream after flushing to
+ * pkt->pts/time_base on the next call to this function (if any).
+ *
+ * @retval "non-negative value" success
+ * @retval AVERROR_EOF no more packets will arrive, should terminate decoding
+ * @retval "another negative error code" other failure
+ */
+int sch_dec_receive(Scheduler *sch, unsigned dec_idx, struct AVPacket *pkt);
+
+/**
+ * Called by decoder tasks to send a decoded frame downstream.
+ *
+ * @param dec_idx Decoder index previously returned by sch_add_dec().
+ * @param frame Decoded frame; on success it is consumed and cleared by this
+ * function
+ *
+ * @retval ">=0" success
+ * @retval AVERROR_EOF all consumers are done, should terminate decoding
+ * @retval "another negative error code" other failure
+ */
+int sch_dec_send(Scheduler *sch, unsigned dec_idx, struct AVFrame *frame);
+
+/**
+ * Called by filtergraph tasks to obtain frames for filtering. Will wait for a
+ * frame to become available and return it in frame.
+ *
+ * Filtergraphs that contain lavfi sources and do not currently require new
+ * input frames should call this function as a means of rate control - then
+ * in_idx should be set equal to nb_inputs on entry to this function.
+ *
+ * @param fg_idx Filtergraph index previously returned by sch_add_filtergraph().
+ * @param[in,out] in_idx On input contains the index of the input on which a frame
+ * is most desired. May be set to nb_inputs to signal that
+ * the filtergraph does not need more input currently.
+ *
+ * On success, will be replaced with the input index of
+ * the actually returned frame or EOF timestamp.
+ *
+ * @retval ">=0" Frame data or EOF timestamp was delivered into frame, in_idx
+ * contains the index of the input it belongs to.
+ * @retval AVERROR(EAGAIN) No frame was returned, the filtergraph should
+ * resume filtering. May only be returned when
+ * in_idx=nb_inputs on entry to this function.
+ * @retval AVERROR_EOF No more frames will arrive, should terminate filtering.
+ */
+int sch_filter_receive(Scheduler *sch, unsigned fg_idx,
+ unsigned *in_idx, struct AVFrame *frame);
+
+/**
+ * Called by filtergraph tasks to send a filtered frame or EOF to consumers.
+ *
+ * @param fg_idx Filtergraph index previously returned by sch_add_filtergraph().
+ * @param out_idx Index of the output which produced the frame.
+ * @param frame The frame to send to consumers. When NULL, signals that no more
+ * frames will be produced for the specified output. When non-NULL,
+ * the frame is consumed and cleared by this function on success.
+ *
+ * @retval "non-negative value" success
+ * @retval AVERROR_EOF all consumers are done
+ * @retval "anoter negative error code" other failure
+ */
+int sch_filter_send(Scheduler *sch, unsigned fg_idx, unsigned out_idx,
+ struct AVFrame *frame);
+
+int sch_filter_command(Scheduler *sch, unsigned fg_idx, struct AVFrame *frame);
+
+/**
+ * Called by encoder tasks to obtain frames for encoding. Will wait for a frame
+ * to become available and return it in frame.
+ *
+ * @param enc_idx Encoder index previously returned by sch_add_enc().
+ * @param frame Newly-received frame will be stored here on success. Must be
+ * clean on entrance to this function.
+ *
+ * @retval 0 A frame was successfully delivered into frame.
+ * @retval AVERROR_EOF No more frames will be delivered, the encoder should
+ * flush everything and terminate.
+ *
+ */
+int sch_enc_receive(Scheduler *sch, unsigned enc_idx, struct AVFrame *frame);
+
+/**
+ * Called by encoder tasks to send encoded packets downstream.
+ *
+ * @param enc_idx Encoder index previously returned by sch_add_enc().
+ * @param pkt An encoded packet; it will be consumed and cleared by this
+ * function on success.
+ *
+ * @retval 0 success
+ * @retval "<0" Error code.
+ */
+int sch_enc_send (Scheduler *sch, unsigned enc_idx, struct AVPacket *pkt);
+
+/**
+ * Called by muxer tasks to obtain packets for muxing. Will wait for a packet
+ * for any muxed stream to become available and return it in pkt.
+ *
+ * @param mux_idx Muxer index previously returned by sch_add_mux().
+ * @param pkt Newly-received packet will be stored here on success. Must be
+ * clean on entrance to this function.
+ *
+ * @retval 0 A packet was successfully delivered into pkt. Its stream_index
+ * corresponds to a stream index previously returned from
+ * sch_add_mux_stream().
+ * @retval AVERROR_EOF When pkt->stream_index is non-negative, this signals that
+ * no more packets will be delivered for this stream index.
+ * Otherwise this indicates that no more packets will be
+ * delivered for any stream and the muxer should therefore
+ * flush everything and terminate.
+ */
+int sch_mux_receive(Scheduler *sch, unsigned mux_idx, struct AVPacket *pkt);
+
+/**
+ * Called by muxer tasks to signal that a stream will no longer accept input.
+ *
+ * @param stream_idx Stream index previously returned from sch_add_mux_stream().
+ */
+void sch_mux_receive_finish(Scheduler *sch, unsigned mux_idx, unsigned stream_idx);
+
+int sch_mux_sub_heartbeat_add(Scheduler *sch, unsigned mux_idx, unsigned stream_idx,
+ unsigned dec_idx);
+int sch_mux_sub_heartbeat(Scheduler *sch, unsigned mux_idx, unsigned stream_idx,
+ const AVPacket *pkt);
+
+#endif /* FFTOOLS_FFMPEG_SCHED_H */
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