From 357561e73fea7364b31b7e14f5235dfd18716c91 Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Wed, 18 Nov 2009 22:32:32 +0000 Subject: [PATCH] Clarify relations between log2_chroma_w, log2_chroma_h and comp. Originally committed as revision 20550 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavutil/pixdesc.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/libavutil/pixdesc.h b/libavutil/pixdesc.h index 207bf00f27..7acab9372e 100644 --- a/libavutil/pixdesc.h +++ b/libavutil/pixdesc.h @@ -62,6 +62,7 @@ typedef struct AVPixFmtDescriptor{ * For YV12 this is 1 for example. * chroma_width = -((-luma_width) >> log2_chroma_w) * The note above is needed to ensure rounding up. + * This value only refers to the chroma components. */ uint8_t log2_chroma_w; ///< chroma_width = -((-luma_width )>>log2_chroma_w) @@ -70,10 +71,17 @@ typedef struct AVPixFmtDescriptor{ * For YV12 this is 1 for example. * chroma_height= -((-luma_height) >> log2_chroma_h) * The note above is needed to ensure rounding up. + * This value only refers to the chroma components. */ uint8_t log2_chroma_h; uint8_t flags; - AVComponentDescriptor comp[4]; ///< parameters that describe how pixels are packed + + /** + * Parameters that describe how pixels are packed. If the format + * has chroma components, they must be stored in comp[1] and + * comp[2]. + */ + AVComponentDescriptor comp[4]; }AVPixFmtDescriptor; #define PIX_FMT_BE 1 ///< big-endian