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authorAnton Khirnov <anton@khirnov.net>2021-12-12 12:16:42 +0100
committerAnton Khirnov <anton@khirnov.net>2022-07-23 11:53:19 +0200
commit9c2b800203a5a8f3d83f3b8f28e8c50d28186b39 (patch)
treef1dd977e229f7882c74a485eac96d2b52f043167 /fftools/ffmpeg_mux.c
parent35bfcff07f3b5efc8f322d899de136040c2772a7 (diff)
fftools/ffmpeg: move the mux queue into muxer private data
The muxing queue currently lives in OutputStream, which is a very large struct storing the state for both encoding and muxing. The muxing queue is only used by the code in ffmpeg_mux, so it makes sense to restrict it to that file. This makes the first step towards reducing the scope of OutputStream.
Diffstat (limited to 'fftools/ffmpeg_mux.c')
-rw-r--r--fftools/ffmpeg_mux.c87
1 files changed, 73 insertions, 14 deletions
diff --git a/fftools/ffmpeg_mux.c b/fftools/ffmpeg_mux.c
index 19519052fe..d49235ee63 100644
--- a/fftools/ffmpeg_mux.c
+++ b/fftools/ffmpeg_mux.c
@@ -32,7 +32,20 @@
#include "libavformat/avformat.h"
#include "libavformat/avio.h"
+typedef struct MuxStream {
+ /* the packets are buffered here until the muxer is ready to be initialized */
+ AVFifo *muxing_queue;
+
+ /*
+ * The size of the AVPackets' buffers in queue.
+ * Updated when a packet is either pushed or pulled from the queue.
+ */
+ size_t muxing_queue_data_size;
+} MuxStream;
+
struct Muxer {
+ MuxStream *streams;
+
/* filesize limit expressed in bytes */
int64_t limit_filesize;
int64_t final_filesize;
@@ -55,6 +68,7 @@ void of_write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost,
{
AVFormatContext *s = of->ctx;
AVStream *st = ost->st;
+ MuxStream *ms = &of->mux->streams[st->index];
int ret;
/*
@@ -76,10 +90,10 @@ void of_write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost,
if (!of->mux->header_written) {
AVPacket *tmp_pkt;
/* the muxer is not initialized yet, buffer the packet */
- if (!av_fifo_can_write(ost->muxing_queue)) {
- size_t cur_size = av_fifo_can_read(ost->muxing_queue);
+ if (!av_fifo_can_write(ms->muxing_queue)) {
+ size_t cur_size = av_fifo_can_read(ms->muxing_queue);
unsigned int are_we_over_size =
- (ost->muxing_queue_data_size + pkt->size) > ost->muxing_queue_data_threshold;
+ (ms->muxing_queue_data_size + pkt->size) > ost->muxing_queue_data_threshold;
size_t limit = are_we_over_size ? ost->max_muxing_queue_size : SIZE_MAX;
size_t new_size = FFMIN(2 * cur_size, limit);
@@ -89,7 +103,7 @@ void of_write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost,
ost->file_index, ost->st->index);
exit_program(1);
}
- ret = av_fifo_grow2(ost->muxing_queue, new_size - cur_size);
+ ret = av_fifo_grow2(ms->muxing_queue, new_size - cur_size);
if (ret < 0)
exit_program(1);
}
@@ -100,8 +114,8 @@ void of_write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost,
if (!tmp_pkt)
exit_program(1);
av_packet_move_ref(tmp_pkt, pkt);
- ost->muxing_queue_data_size += tmp_pkt->size;
- av_fifo_write(ost->muxing_queue, &tmp_pkt, 1);
+ ms->muxing_queue_data_size += tmp_pkt->size;
+ av_fifo_write(ms->muxing_queue, &tmp_pkt, 1);
return;
}
@@ -270,15 +284,16 @@ int of_check_init(OutputFile *of)
/* flush the muxing queues */
for (i = 0; i < of->ctx->nb_streams; i++) {
+ MuxStream *ms = &of->mux->streams[i];
OutputStream *ost = output_streams[of->ost_index + i];
AVPacket *pkt;
/* try to improve muxing time_base (only possible if nothing has been written yet) */
- if (!av_fifo_can_read(ost->muxing_queue))
+ if (!av_fifo_can_read(ms->muxing_queue))
ost->mux_timebase = ost->st->time_base;
- while (av_fifo_read(ost->muxing_queue, &pkt, 1) >= 0) {
- ost->muxing_queue_data_size -= pkt->size;
+ while (av_fifo_read(ms->muxing_queue, &pkt, 1) >= 0) {
+ ms->muxing_queue_data_size -= pkt->size;
of_write_packet(of, pkt, ost, 1);
av_packet_free(&pkt);
}
@@ -319,6 +334,29 @@ int of_write_trailer(OutputFile *of)
return 0;
}
+static void mux_free(Muxer **pmux, int nb_streams)
+{
+ Muxer *mux = *pmux;
+
+ if (!mux)
+ return;
+
+ for (int i = 0; i < nb_streams; i++) {
+ MuxStream *ms = &mux->streams[i];
+ AVPacket *pkt;
+
+ if (!ms->muxing_queue)
+ continue;
+
+ while (av_fifo_read(ms->muxing_queue, &pkt, 1) >= 0)
+ av_packet_free(&pkt);
+ av_fifo_freep2(&ms->muxing_queue);
+ }
+ av_freep(&mux->streams);
+
+ av_freep(pmux);
+}
+
void of_close(OutputFile **pof)
{
OutputFile *of = *pof;
@@ -328,25 +366,42 @@ void of_close(OutputFile **pof)
return;
s = of->ctx;
+
+ mux_free(&of->mux, s ? s->nb_streams : 0);
+
if (s && s->oformat && !(s->oformat->flags & AVFMT_NOFILE))
avio_closep(&s->pb);
avformat_free_context(s);
av_dict_free(&of->opts);
- av_freep(&of->mux);
-
av_freep(pof);
}
int of_muxer_init(OutputFile *of, int64_t limit_filesize)
{
Muxer *mux = av_mallocz(sizeof(*mux));
+ int ret = 0;
if (!mux)
return AVERROR(ENOMEM);
+ mux->streams = av_calloc(of->ctx->nb_streams, sizeof(*mux->streams));
+ if (!mux->streams) {
+ av_freep(&mux);
+ return AVERROR(ENOMEM);
+ }
+
of->mux = mux;
+ for (int i = 0; i < of->ctx->nb_streams; i++) {
+ MuxStream *ms = &mux->streams[i];
+ ms->muxing_queue = av_fifo_alloc2(8, sizeof(AVPacket*), 0);
+ if (!ms->muxing_queue) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+ }
+
mux->limit_filesize = limit_filesize;
if (strcmp(of->format->name, "rtp"))
@@ -354,12 +409,16 @@ int of_muxer_init(OutputFile *of, int64_t limit_filesize)
/* write the header for files with no streams */
if (of->format->flags & AVFMT_NOSTREAMS && of->ctx->nb_streams == 0) {
- int ret = of_check_init(of);
+ ret = of_check_init(of);
if (ret < 0)
- return ret;
+ goto fail;
}
- return 0;
+fail:
+ if (ret < 0)
+ mux_free(&of->mux, of->ctx->nb_streams);
+
+ return ret;
}
int of_finished(OutputFile *of)