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lavc/encode: pass through frame durations to encoded packets

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The generic code can only handle the no-delay case. Encoders with delay
need to be handled individually, which will be done in the following
commits.
This commit is contained in:
Anton Khirnov 2022-07-12 11:25:09 +02:00
parent 8d73f3ce56
commit a1a80f2e64
4 changed files with 22 additions and 4 deletions
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4
doc/APIchanges
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@ -14,8 +14,8 @@ libavutil: 2021-04-27
API changes, most recent first:
2023-01-xx - xxxxxxxxxx - lavc 59.59.100 - avcodec.h
Add AV_CODEC_FLAG_COPY_OPAQUE.
2023-01-29 - xxxxxxxxxx - lavc 59.59.100 - avcodec.h
Add AV_CODEC_FLAG_COPY_OPAQUE and AV_CODEC_FLAG_FRAME_DURATION.
2023-01-13 - xxxxxxxxxx - lavu 57.44.100 - ambient_viewing_environment.h frame.h
Adds a new structure for holding H.274 Ambient Viewing Environment metadata,

7
libavcodec/avcodec.h
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@ -267,6 +267,13 @@ typedef struct RcOverride{
* taken from the first of those.
*/
#define AV_CODEC_FLAG_COPY_OPAQUE (1 << 7)
/**
* Signal to the encoder that the values of AVFrame.duration are valid and
* should be used (typically for transferring them to output packets).
*
* If this flag is not set, frame durations are ignored.
*/
#define AV_CODEC_FLAG_FRAME_DURATION (1 << 8)
/**
* Use internal 2pass ratecontrol in first pass mode.
*/

14
libavcodec/encode.c
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@ -231,10 +231,13 @@ int ff_encode_encode_cb(AVCodecContext *avctx, AVPacket *avpkt,
if (avpkt->pts == AV_NOPTS_VALUE)
avpkt->pts = frame->pts;
if (avctx->codec->type == AVMEDIA_TYPE_AUDIO) {
if (!avpkt->duration)
if (!avpkt->duration) {
if (frame->duration)
avpkt->duration = frame->duration;
else if (avctx->codec->type == AVMEDIA_TYPE_AUDIO) {
avpkt->duration = ff_samples_to_time_base(avctx,
frame->nb_samples);
}
}
ret = ff_encode_reordered_opaque(avctx, avpkt, frame);
@ -463,6 +466,13 @@ FF_ENABLE_DEPRECATION_WARNINGS
return ret;
}
// unset frame duration unless AV_CODEC_FLAG_FRAME_DURATION is set,
// since otherwise we cannot be sure that whatever value it has is in the
// right timebase, so we would produce an incorrect value, which is worse
// than none at all
if (!(avctx->flags & AV_CODEC_FLAG_FRAME_DURATION))
dst->duration = 0;
return 0;
}

1
libavcodec/options_table.h
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@ -59,6 +59,7 @@ static const AVOption avcodec_options[] = {
{"qscale", "use fixed qscale", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_QSCALE }, INT_MIN, INT_MAX, 0, "flags"},
{"recon_frame", "export reconstructed frames", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_RECON_FRAME}, .unit = "flags"},
{"copy_opaque", "propagate opaque values", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_COPY_OPAQUE}, .unit = "flags"},
{"frame_duration", "use frame durations", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_FRAME_DURATION}, .unit = "flags"},
{"pass1", "use internal 2-pass ratecontrol in first pass mode", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_PASS1 }, INT_MIN, INT_MAX, 0, "flags"},
{"pass2", "use internal 2-pass ratecontrol in second pass mode", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_PASS2 }, INT_MIN, INT_MAX, 0, "flags"},
{"gray", "only decode/encode grayscale", 0, AV_OPT_TYPE_CONST, {.i64 = AV_CODEC_FLAG_GRAY }, INT_MIN, INT_MAX, V|E|D, "flags"},