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final word on RGBA byte order

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Originally committed as revision 2268 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson
2003-09-13 02:31:03 +00:00
parent e7015b41e7
commit 0f371e3e2a
2 changed files with 15 additions and 13 deletions
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16
libavcodec/avcodec.h
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@@ -115,7 +115,19 @@ enum CodecType {
};
/**
* Pixel format.
* Pixel format. Notes:
*
* PIX_FMT_RGBA32 is handled in an endian-specific manner. A RGBA
* color is put together as:
* (A << 24) | (R << 16) | (G << 8) | B
* This is stored as BGRA on little endian CPU architectures and ARGB on
* big endian CPUs.
*
* When the pixel format is palettized RGB (PIX_FMT_PAL8), the palettized
* image data is stored in AVFrame.data[0]. The palette is transported in
* AVFrame.data[1] and, is 1024 bytes long (256 4-byte entries) and is
* formatted the same as in PIX_FMT_RGBA32 described above (i.e., it is
* also endian-specific).
*/
enum PixelFormat {
PIX_FMT_YUV420P, ///< Planar YUV 4:2:0 (1 Cr & Cb sample per 2x2 Y samples)
@@ -124,7 +136,7 @@ enum PixelFormat {
PIX_FMT_BGR24, ///< Packed pixel, 3 bytes per pixel, BGRBGR...
PIX_FMT_YUV422P, ///< Planar YUV 4:2:2 (1 Cr & Cb sample per 2x1 Y samples)
PIX_FMT_YUV444P, ///< Planar YUV 4:4:4 (1 Cr & Cb sample per 1x1 Y samples)
PIX_FMT_RGBA32, ///< Packed pixel, 4 bytes per pixel, BGRABGRA...
PIX_FMT_RGBA32, ///< Packed pixel, 4 bytes per pixel, BGRABGRA..., stored in cpu endianness
PIX_FMT_YUV410P, ///< Planar YUV 4:1:0 (1 Cr & Cb sample per 4x4 Y samples)
PIX_FMT_YUV411P, ///< Planar YUV 4:1:1 (1 Cr & Cb sample per 4x1 Y samples)
PIX_FMT_RGB565, ///< always stored in cpu endianness