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fftools/ffmpeg: add loopback decoding

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This allows to send an encoder's output back to decoding and feed the
result into a complex filtergraph.
This commit is contained in:
Anton Khirnov
2024-02-19 10:27:44 +01:00
parent b98af440c5
commit a9193f7b7d
10 changed files with 336 additions and 14 deletions
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19
fftools/ffmpeg_enc.c
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@@ -49,6 +49,7 @@ struct Encoder {
uint64_t packets_encoded;
int opened;
int attach_par;
Scheduler *sch;
unsigned sch_idx;
@@ -693,6 +694,18 @@ static int encode_frame(OutputFile *of, OutputStream *ost, AVFrame *frame,
return AVERROR(ENOMEM);
fd->wallclock[LATENCY_PROBE_ENC_POST] = av_gettime_relative();
// attach stream parameters to first packet if requested
avcodec_parameters_free(&fd->par_enc);
if (e->attach_par && !e->packets_encoded) {
fd->par_enc = avcodec_parameters_alloc();
if (!fd->par_enc)
return AVERROR(ENOMEM);
ret = avcodec_parameters_from_context(fd->par_enc, enc);
if (ret < 0)
return ret;
}
if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
ret = update_video_stats(ost, pkt, !!vstats_filename);
if (ret < 0)
@@ -929,3 +942,9 @@ finish:
return ret;
}
int enc_loopback(Encoder *enc)
{
enc->attach_par = 1;
return enc->sch_idx;
}