Message ID | 20230118142405.23568-1-leo.izen@gmail.com |
---|---|
State | Accepted |
Commit | 9d5e66942c5bae578926e29efebec348199798df |
Headers | show |
Series | [FFmpeg-devel] avcodec/libjxldec: fix gamma22 and gamma28 recognization | expand |
On Wed, Jan 18, 2023 at 4:24 PM Leo Izen <leo.izen@gmail.com> wrote: > > Gamma 2.2 and Gamma 2.8 are tagged in the file as 0.45455 and 0.35714, > respectively (i.e. 1/2.2 and 1/2.8). Trying to identify them as 2.2 and > 2.8 instead of these values will cause the transfer function to not > properly be recognized. This patch fixes this. Agreed upon reading the spec, which notes that the value is saved as an unsigned 24bit integer consisting of the numerator part of a rational number, with a 10^7 denumerator and a valid range of (0, 1]. Only nit: recognization -> recognition > --- > libavcodec/libjxldec.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/libavcodec/libjxldec.c b/libavcodec/libjxldec.c > index 55c7366f61..0009af9615 100644 > --- a/libavcodec/libjxldec.c > +++ b/libavcodec/libjxldec.c > @@ -167,9 +167,9 @@ static enum AVColorTransferCharacteristic libjxl_get_trc(void *avctx, const JxlC > case JXL_TRANSFER_FUNCTION_DCI: return AVCOL_TRC_SMPTE428; > case JXL_TRANSFER_FUNCTION_HLG: return AVCOL_TRC_ARIB_STD_B67; > case JXL_TRANSFER_FUNCTION_GAMMA: > - if (jxl_color->gamma > 2.199 && jxl_color->gamma < 2.201) > + if (jxl_color->gamma > 0.45355 && jxl_color->gamma < 0.45555) > return AVCOL_TRC_GAMMA22; > - else if (jxl_color->gamma > 2.799 && jxl_color->gamma < 2.801) > + else if (jxl_color->gamma > 0.35614 && jxl_color->gamma < 0.35814) These values leave ~0.001 of leeway which seems like it was before. LGTM
On Sat, Jan 21, 2023 at 12:15 AM Jan Ekström <jeebjp@gmail.com> wrote: > > On Wed, Jan 18, 2023 at 4:24 PM Leo Izen <leo.izen@gmail.com> wrote: > > > > Gamma 2.2 and Gamma 2.8 are tagged in the file as 0.45455 and 0.35714, > > respectively (i.e. 1/2.2 and 1/2.8). Trying to identify them as 2.2 and > > 2.8 instead of these values will cause the transfer function to not > > properly be recognized. This patch fixes this. > > Agreed upon reading the spec, which notes that the value is saved as > an unsigned 24bit integer consisting of the numerator part of a > rational number, with a 10^7 denumerator and a valid range of (0, 1]. > > Only nit: recognization -> recognition > > > --- > > libavcodec/libjxldec.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/libavcodec/libjxldec.c b/libavcodec/libjxldec.c > > index 55c7366f61..0009af9615 100644 > > --- a/libavcodec/libjxldec.c > > +++ b/libavcodec/libjxldec.c > > @@ -167,9 +167,9 @@ static enum AVColorTransferCharacteristic libjxl_get_trc(void *avctx, const JxlC > > case JXL_TRANSFER_FUNCTION_DCI: return AVCOL_TRC_SMPTE428; > > case JXL_TRANSFER_FUNCTION_HLG: return AVCOL_TRC_ARIB_STD_B67; > > case JXL_TRANSFER_FUNCTION_GAMMA: > > - if (jxl_color->gamma > 2.199 && jxl_color->gamma < 2.201) > > + if (jxl_color->gamma > 0.45355 && jxl_color->gamma < 0.45555) > > return AVCOL_TRC_GAMMA22; > > - else if (jxl_color->gamma > 2.799 && jxl_color->gamma < 2.801) > > + else if (jxl_color->gamma > 0.35614 && jxl_color->gamma < 0.35814) > > These values leave ~0.001 of leeway which seems like it was before. > > LGTM Applied to master as 9d5e66942c5bae578926e29efebec348199798df with the typo fix, as well as back-ported to release/5.1. Jan
diff --git a/libavcodec/libjxldec.c b/libavcodec/libjxldec.c index 55c7366f61..0009af9615 100644 --- a/libavcodec/libjxldec.c +++ b/libavcodec/libjxldec.c @@ -167,9 +167,9 @@ static enum AVColorTransferCharacteristic libjxl_get_trc(void *avctx, const JxlC case JXL_TRANSFER_FUNCTION_DCI: return AVCOL_TRC_SMPTE428; case JXL_TRANSFER_FUNCTION_HLG: return AVCOL_TRC_ARIB_STD_B67; case JXL_TRANSFER_FUNCTION_GAMMA: - if (jxl_color->gamma > 2.199 && jxl_color->gamma < 2.201) + if (jxl_color->gamma > 0.45355 && jxl_color->gamma < 0.45555) return AVCOL_TRC_GAMMA22; - else if (jxl_color->gamma > 2.799 && jxl_color->gamma < 2.801) + else if (jxl_color->gamma > 0.35614 && jxl_color->gamma < 0.35814) return AVCOL_TRC_GAMMA28; else av_log(avctx, AV_LOG_WARNING, "Unsupported gamma transfer: %f\n", jxl_color->gamma);