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avcodec/encode:: generate ICC profiles 

Only if requested, and only if the codec signals support for ICC
profiles. Implementation roughly matches the functionality of the
existing vf_iccgen filter, albeit with some reduced flexibility and no
caching.

Ideally, we'd also only do this on the first frame (e.g. mjpeg, apng),
but there's no meaningful way for us to distinguish between this case
and e.g. somebody using the image2 muxer, in which case we'd want to
attach ICC profiles to every frame in the stream.

Closes: #9672

Signed-off-by: Niklas Haas <git@haasn.dev>
This commit is contained in:
Niklas Haas 2022-06-28 15:03:19 +02:00
parent 77f8dcb265
commit 8377ef43f4
1 changed files with 53 additions and 0 deletions
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53
libavcodec/encode.c
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@ -308,6 +308,53 @@ static int encode_receive_packet_internal(AVCodecContext *avctx, AVPacket *avpkt
return ret;
}
#if CONFIG_LCMS2
static int encode_generate_icc_profile(AVCodecContext *avctx, AVFrame *frame)
{
enum AVColorTransferCharacteristic trc = frame->color_trc;
enum AVColorPrimaries prim = frame->color_primaries;
const FFCodec *const codec = ffcodec(avctx->codec);
AVCodecInternal *avci = avctx->internal;
cmsHPROFILE profile;
int ret;
/* don't generate ICC profiles if disabled or unsupported */
if (!(avctx->flags2 & AV_CODEC_FLAG2_ICC_PROFILES))
return 0;
if (!(codec->caps_internal & FF_CODEC_CAP_ICC_PROFILES))
return 0;
if (trc == AVCOL_TRC_UNSPECIFIED)
trc = avctx->color_trc;
if (prim == AVCOL_PRI_UNSPECIFIED)
prim = avctx->color_primaries;
if (trc == AVCOL_TRC_UNSPECIFIED || prim == AVCOL_PRI_UNSPECIFIED)
return 0; /* can't generate ICC profile with missing csp tags */
if (av_frame_get_side_data(frame, AV_FRAME_DATA_ICC_PROFILE))
return 0; /* don't overwrite existing ICC profile */
if (!avci->icc.avctx) {
ret = ff_icc_context_init(&avci->icc, avctx);
if (ret < 0)
return ret;
}
ret = ff_icc_profile_generate(&avci->icc, prim, trc, &profile);
if (ret < 0)
return ret;
ret = ff_icc_profile_attach(&avci->icc, profile, frame);
cmsCloseProfile(profile);
return ret;
}
#else /* !CONFIG_LCMS2 */
static int encode_generate_icc_profile(av_unused AVCodecContext *c, av_unused AVFrame *f)
{
return 0;
}
#endif
static int encode_send_frame_internal(AVCodecContext *avctx, const AVFrame *src)
{
AVCodecInternal *avci = avctx->internal;
@ -360,6 +407,12 @@ FF_DISABLE_DEPRECATION_WARNINGS
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
ret = encode_generate_icc_profile(avctx, dst);
if (ret < 0)
return ret;
}
return 0;
}