[FFmpeg-devel] [PATCH] lavfi: a minor fix to tonemap peak detection.
vittorio.giovara at gmail.com
Mon May 21 22:11:56 EEST 2018
On Mon, May 21, 2018 at 2:58 AM, Ruiling Song <ruiling.song at intel.com>
> If the transfer was SMPTE2084, use the peak of 10000 even if not tagged.
> Otherwise, we would assume it is HLG with a peak of 1200.
> Based on suggestion by Niklas Haas.
> Signed-off-by: Ruiling Song <ruiling.song at intel.com>
> libavfilter/vf_tonemap.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
> diff --git a/libavfilter/vf_tonemap.c b/libavfilter/vf_tonemap.c
> index 10308bd..ab45f2e 100644
> --- a/libavfilter/vf_tonemap.c
> +++ b/libavfilter/vf_tonemap.c
> @@ -131,10 +131,9 @@ static double determine_signal_peak(AVFrame *in)
> peak = av_q2d(metadata->max_luminance) / REFERENCE_WHITE;
> - /* smpte2084 needs the side data above to work correctly
> - * if missing, assume that the original transfer was arib-std-b67 */
> + /* if not SMPTE2084, we would assume HLG */
> if (!peak)
> - peak = 12;
> + peak = in->color_trc == AVCOL_TRC_SMPTE2084 ? 100 : 12;
> return peak;
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