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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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47
fftools/ffmpeg_filter.c
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@@ -710,6 +710,34 @@ static int ifilter_bind_ist(InputFilter *ifilter, InputStream *ist)
return 0;
}
static int ifilter_bind_dec(InputFilterPriv *ifp, Decoder *dec)
{
FilterGraphPriv *fgp = fgp_from_fg(ifp->ifilter.graph);
int ret, dec_idx;
av_assert0(!ifp->bound);
ifp->bound = 1;
if (ifp->type != dec->type) {
av_log(fgp, AV_LOG_ERROR, "Tried to connect %s decoder to %s filtergraph input\n",
av_get_media_type_string(dec->type), av_get_media_type_string(ifp->type));
return AVERROR(EINVAL);
}
ifp->type_src = ifp->type;
dec_idx = dec_filter_add(dec, &ifp->ifilter, &ifp->opts);
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;
return 0;
}
static int set_channel_layout(OutputFilterPriv *f, OutputStream *ost)
{
const AVCodec *c = ost->enc_ctx->codec;
@@ -1114,7 +1142,24 @@ static int fg_complex_bind_input(FilterGraph *fg, InputFilter *ifilter)
enum AVMediaType type = ifp->type;
int i, ret;
if (ifp->linklabel) {
if (ifp->linklabel && !strncmp(ifp->linklabel, "dec:", 4)) {
// bind to a standalone decoder
int dec_idx;
dec_idx = strtol(ifp->linklabel + 4, NULL, 0);
if (dec_idx < 0 || dec_idx >= nb_decoders) {
av_log(fg, AV_LOG_ERROR, "Invalid decoder index %d in filtergraph description %s\n",
dec_idx, fgp->graph_desc);
return AVERROR(EINVAL);
}
ret = ifilter_bind_dec(ifp, decoders[dec_idx]);
if (ret < 0)
av_log(fg, AV_LOG_ERROR, "Error binding a decoder to filtergraph input %s\n",
ifilter->name);
return ret;
} else if (ifp->linklabel) {
// bind to an explicitly specified demuxer stream
AVFormatContext *s;
AVStream *st = NULL;
char *p;