Author: stefano Date: Wed May 26 00:35:45 2010 New Revision: 669 Log: Describe a scheme for defining FourCCs for generic rawvideo YUVA formats, and use it for creating a bunch of them: Y1[00][16], [16][00]1Y, Y3[11][16], [16][11]3Y, Y3[10][16], [16][10]3Y, Y3[00][16], [16][00]3Y, Y4[11][ 8], YA[00][ 8]. Modified: docs/nut4cc.txt Modified: docs/nut4cc.txt ============================================================================== --- docs/nut4cc.txt Sun May 16 18:41:15 2010 (r668) +++ docs/nut4cc.txt Wed May 26 00:35:45 2010 (r669) @@ -101,6 +101,39 @@ RGB[8] Packed RGB 3:3:2, 8bpp, (msb)2R RGB[48] Packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as little-endian [NOT in AVI] [48]RGB Packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big-endian [NOT in AVI] +Since many exotic planar YUVA pixel formats are not contemplated by +the AVI/QuickTime FourCC lists, the following scheme is adopted for +representing them. + +The first two bytes can contain the values: +Y1 = only Y +Y2 = Y+A +Y3 = YUV +Y4 = YUVA + +The third byte represents the width and height chroma subsampling +values for the UV planes, that is the amount to shift the luma +width/height right to find the chroma width/height. + +The fourth byte is the number of bits used (8, 16, ...). + +If the order of bytes is inverted, that means that each component has +to be read big-endian. + +Follows the list of the supported YUVA planar format FourCCs created +using this scheme: + +Y1[00][16] Planar gray, 16bpp, little-endian [NOT in AVI] +[16][00]1Y Planar gray, 16bpp, big-endian [NOT in AVI] +Y3[11][16] Planar YUV 4:2:0, 24bpp, (1 Cr & Cb sample per 2x2 Y samples), little-endian [NOT in AVI] +[16][11]3Y Planar YUV 4:2:0, 24bpp, (1 Cr & Cb sample per 2x2 Y samples), big-endian [NOT in AVI] +Y3[10][16] Planar YUV 4:2:2, 32bpp, (1 Cr & Cb sample per 2x1 Y samples), little-endian [NOT in AVI] +[16][10]3Y Planar YUV 4:2:2, 32bpp, (1 Cr & Cb sample per 2x1 Y samples), big-endian [NOT in AVI] +Y3[00][16] Planar YUV 4:4:4, 48bpp, (1 Cr & Cb sample per 1x1 Y samples), little-endian [NOT in AVI] +[16][00]3Y Planar YUV 4:4:4, 48bpp, (1 Cr & Cb sample per 1x1 Y samples), big-endian [NOT in AVI] +Y4[11][ 8] Planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples) [NOT in AVI] +Y2[00][ 8] 8bit gray, 8bit alpha [NOT in AVI] + Raw audio: [x] is an byte with value x, [NOT in AVI] ALAW A-LAW ULAW MU-LAW