diff options
Diffstat (limited to 'libavutil')
| -rw-r--r-- | libavutil/pixdesc.c | 12 | ||||
| -rw-r--r-- | libavutil/pixdesc.h | 14 |
2 files changed, 26 insertions, 0 deletions
diff --git a/libavutil/pixdesc.c b/libavutil/pixdesc.c index bc446b1fab..d0889b4b38 100644 --- a/libavutil/pixdesc.c +++ b/libavutil/pixdesc.c @@ -1454,3 +1454,15 @@ enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc) return desc - av_pix_fmt_descriptors; } + +int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, + int *h_shift, int *v_shift) +{ + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); + if (!desc) + return AVERROR(ENOSYS); + *h_shift = desc->log2_chroma_w; + *v_shift = desc->log2_chroma_h; + + return 0; +} diff --git a/libavutil/pixdesc.h b/libavutil/pixdesc.h index 7da17bcf12..a944c66dd3 100644 --- a/libavutil/pixdesc.h +++ b/libavutil/pixdesc.h @@ -203,4 +203,18 @@ const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev); */ enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc); +/** + * Utility function to access log2_chroma_w log2_chroma_h from + * the pixel format AVPixFmtDescriptor. + * + * @param[in] pix_fmt the pixel format + * @param[out] h_shift store log2_chroma_h + * @param[out] v_shift store log2_chroma_w + * + * @return 0 on success, AVERROR(ENOSYS) on invalid or unknown pixel format + */ +int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, + int *h_shift, int *v_shift); + + #endif /* AVUTIL_PIXDESC_H */ |