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avcodec: allow bypassing frame threading with an optional flag

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Normally, this function tries to make sure all threads are saturated with
work to do before returning any frames; and will continue requesting packets
until that is the case.

However, this significantly slows down initial decoding latency when only
requesting a single frame (to e.g. configure the filter graph), and also
wastes a lot of unnecessary memory in the event that the user does not intend
to decode more frames until later.

By introducing a new `flags` paramater and a new flag
`AV_CODEC_RECEIVE_FRAME_FLAG_SYNCHRONOUS` to go along with it, we can allow
users to temporarily bypass this logic.
This commit is contained in:
Niklas Haas
2025-12-05 19:41:36 +01:00
parent 077864dfd6
commit 5e56937b74
7 changed files with 44 additions and 12 deletions
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libavcodec/avcodec.c
+8 -2
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@@ -705,7 +705,8 @@ int avcodec_is_open(AVCodecContext *s)
return !!s->internal;
}
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
int attribute_align_arg avcodec_receive_frame2(AVCodecContext *avctx,
AVFrame *frame, unsigned flags)
{
av_frame_unref(frame);
@@ -713,10 +714,15 @@ int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *fr
return AVERROR(EINVAL);
if (ff_codec_is_decoder(avctx->codec))
return ff_decode_receive_frame(avctx, frame);
return ff_decode_receive_frame(avctx, frame, flags);
return ff_encode_receive_frame(avctx, frame);
}
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
return avcodec_receive_frame2(avctx, frame, 0);
}
#define WRAP_CONFIG(allowed_type, field, var, field_type, sentinel_check) \
do { \
if (codec->type != (allowed_type)) \