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avcodec/libjxlenc: also attach extra channel info

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Works around a bug where older versions of libjxl don't correctly forward
the alpha channel information to the extra channel info.
This commit is contained in:
Niklas Haas
2025-07-23 15:29:41 +02:00
parent a88cc0a53e
commit 51572ff08a
1 changed files with 13 additions and 0 deletions
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13
libavcodec/libjxlenc.c
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@@ -445,6 +445,19 @@ static int libjxl_preprocess_stream(AVCodecContext *avctx, const AVFrame *frame,
goto end;
}
if (info.alpha_bits) {
JxlExtraChannelInfo extra_info;
JxlEncoderInitExtraChannelInfo(JXL_CHANNEL_ALPHA, &extra_info);
extra_info.bits_per_sample = info.alpha_bits;
extra_info.exponent_bits_per_sample = info.alpha_exponent_bits;
extra_info.alpha_premultiplied = info.alpha_premultiplied;
if (JxlEncoderSetExtraChannelInfo(ctx->encoder, 0, &extra_info) != JXL_ENC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Failed to set JxlExtraChannelInfo for alpha!\n");
return AVERROR_EXTERNAL;
}
}
sd = av_frame_get_side_data(frame, AV_FRAME_DATA_ICC_PROFILE);
if (sd && sd->size && JxlEncoderSetICCProfile(ctx->encoder, sd->data, sd->size) != JXL_ENC_SUCCESS) {
av_log(avctx, AV_LOG_WARNING, "Could not set ICC Profile\n");