1 # Introduction 2 3 Formats (FOURCC) supported by libyuv are detailed here. 4 5 # Core Formats 6 7 There are 2 core formats supported by libyuv - I420 and ARGB. All YUV formats can be converted to/from I420. All RGB formats can be converted to/from ARGB. 8 9 Filtering functions such as scaling and planar functions work on I420 and/or ARGB. 10 11 # OSX Core Media Pixel Formats 12 13 This is how OSX formats map to libyuv 14 15 enum { 16 kCMPixelFormat_32ARGB = 32, FOURCC_BGRA 17 kCMPixelFormat_32BGRA = 'BGRA', FOURCC_ARGB 18 kCMPixelFormat_24RGB = 24, FOURCC_RAW 19 kCMPixelFormat_16BE555 = 16, Not supported. 20 kCMPixelFormat_16BE565 = 'B565', Not supported. 21 kCMPixelFormat_16LE555 = 'L555', FOURCC_RGBO 22 kCMPixelFormat_16LE565 = 'L565', FOURCC_RGBP 23 kCMPixelFormat_16LE5551 = '5551', FOURCC_RGBO 24 kCMPixelFormat_422YpCbCr8 = '2vuy', FOURCC_UYVY 25 kCMPixelFormat_422YpCbCr8_yuvs = 'yuvs', FOURCC_YUY2 26 kCMPixelFormat_444YpCbCr8 = 'v308', FOURCC_I444 ? 27 kCMPixelFormat_4444YpCbCrA8 = 'v408', Not supported. 28 kCMPixelFormat_422YpCbCr16 = 'v216', Not supported. 29 kCMPixelFormat_422YpCbCr10 = 'v210', FOURCC_V210 previously. Removed now. 30 kCMPixelFormat_444YpCbCr10 = 'v410', Not supported. 31 kCMPixelFormat_8IndexedGray_WhiteIsZero = 0x00000028, Not supported. 32 }; 33 34 35 # FOURCC (Four Charactacter Code) List 36 37 The following is extracted from video_common.h as a complete list of formats supported by libyuv. 38 39 enum FourCC { 40 // 9 Primary YUV formats: 5 planar, 2 biplanar, 2 packed. 41 FOURCC_I420 = FOURCC('I', '4', '2', '0'), 42 FOURCC_I422 = FOURCC('I', '4', '2', '2'), 43 FOURCC_I444 = FOURCC('I', '4', '4', '4'), 44 FOURCC_I411 = FOURCC('I', '4', '1', '1'), 45 FOURCC_I400 = FOURCC('I', '4', '0', '0'), 46 FOURCC_NV21 = FOURCC('N', 'V', '2', '1'), 47 FOURCC_NV12 = FOURCC('N', 'V', '1', '2'), 48 FOURCC_YUY2 = FOURCC('Y', 'U', 'Y', '2'), 49 FOURCC_UYVY = FOURCC('U', 'Y', 'V', 'Y'), 50 51 // 2 Secondary YUV formats: row biplanar. 52 FOURCC_M420 = FOURCC('M', '4', '2', '0'), 53 FOURCC_Q420 = FOURCC('Q', '4', '2', '0'), 54 55 // 9 Primary RGB formats: 4 32 bpp, 2 24 bpp, 3 16 bpp. 56 FOURCC_ARGB = FOURCC('A', 'R', 'G', 'B'), 57 FOURCC_BGRA = FOURCC('B', 'G', 'R', 'A'), 58 FOURCC_ABGR = FOURCC('A', 'B', 'G', 'R'), 59 FOURCC_24BG = FOURCC('2', '4', 'B', 'G'), 60 FOURCC_RAW = FOURCC('r', 'a', 'w', ' '), 61 FOURCC_RGBA = FOURCC('R', 'G', 'B', 'A'), 62 FOURCC_RGBP = FOURCC('R', 'G', 'B', 'P'), // rgb565 LE. 63 FOURCC_RGBO = FOURCC('R', 'G', 'B', 'O'), // argb1555 LE. 64 FOURCC_R444 = FOURCC('R', '4', '4', '4'), // argb4444 LE. 65 66 // 4 Secondary RGB formats: 4 Bayer Patterns. 67 FOURCC_RGGB = FOURCC('R', 'G', 'G', 'B'), 68 FOURCC_BGGR = FOURCC('B', 'G', 'G', 'R'), 69 FOURCC_GRBG = FOURCC('G', 'R', 'B', 'G'), 70 FOURCC_GBRG = FOURCC('G', 'B', 'R', 'G'), 71 72 // 1 Primary Compressed YUV format. 73 FOURCC_MJPG = FOURCC('M', 'J', 'P', 'G'), 74 75 // 5 Auxiliary YUV variations: 3 with U and V planes are swapped, 1 Alias. 76 FOURCC_YV12 = FOURCC('Y', 'V', '1', '2'), 77 FOURCC_YV16 = FOURCC('Y', 'V', '1', '6'), 78 FOURCC_YV24 = FOURCC('Y', 'V', '2', '4'), 79 FOURCC_YU12 = FOURCC('Y', 'U', '1', '2'), // Linux version of I420. 80 FOURCC_J420 = FOURCC('J', '4', '2', '0'), 81 FOURCC_J400 = FOURCC('J', '4', '0', '0'), 82 83 // 14 Auxiliary aliases. CanonicalFourCC() maps these to canonical fourcc. 84 FOURCC_IYUV = FOURCC('I', 'Y', 'U', 'V'), // Alias for I420. 85 FOURCC_YU16 = FOURCC('Y', 'U', '1', '6'), // Alias for I422. 86 FOURCC_YU24 = FOURCC('Y', 'U', '2', '4'), // Alias for I444. 87 FOURCC_YUYV = FOURCC('Y', 'U', 'Y', 'V'), // Alias for YUY2. 88 FOURCC_YUVS = FOURCC('y', 'u', 'v', 's'), // Alias for YUY2 on Mac. 89 FOURCC_HDYC = FOURCC('H', 'D', 'Y', 'C'), // Alias for UYVY. 90 FOURCC_2VUY = FOURCC('2', 'v', 'u', 'y'), // Alias for UYVY on Mac. 91 FOURCC_JPEG = FOURCC('J', 'P', 'E', 'G'), // Alias for MJPG. 92 FOURCC_DMB1 = FOURCC('d', 'm', 'b', '1'), // Alias for MJPG on Mac. 93 FOURCC_BA81 = FOURCC('B', 'A', '8', '1'), // Alias for BGGR. 94 FOURCC_RGB3 = FOURCC('R', 'G', 'B', '3'), // Alias for RAW. 95 FOURCC_BGR3 = FOURCC('B', 'G', 'R', '3'), // Alias for 24BG. 96 FOURCC_CM32 = FOURCC(0, 0, 0, 32), // Alias for BGRA kCMPixelFormat_32ARGB 97 FOURCC_CM24 = FOURCC(0, 0, 0, 24), // Alias for RAW kCMPixelFormat_24RGB 98 FOURCC_L555 = FOURCC('L', '5', '5', '5'), // Alias for RGBO. 99 FOURCC_L565 = FOURCC('L', '5', '6', '5'), // Alias for RGBP. 100 FOURCC_5551 = FOURCC('5', '5', '5', '1'), // Alias for RGBO. 101 102 // 1 Auxiliary compressed YUV format set aside for capturer. 103 FOURCC_H264 = FOURCC('H', '2', '6', '4'), 104 105 # The ARGB FOURCC 106 107 There are 4 ARGB layouts - ARGB, BGRA, ABGR and RGBA. ARGB is most common by far, used for screen formats, and windows webcam drivers. 108 109 The fourcc describes the order of channels in a ***register***. 110 111 A fourcc provided by capturer, can be thought of string, e.g. "ARGB". 112 113 On little endian machines, as an int, this would have 'A' in the lowest byte. The FOURCC macro reverses the order: 114 115 #define FOURCC(a, b, c, d) (((uint32)(a)) | ((uint32)(b) << 8) | ((uint32)(c) << 16) | ((uint32)(d) << 24)) 116 117 So the "ARGB" string, read as an uint32, is 118 119 FOURCC_ARGB = FOURCC('A', 'R', 'G', 'B') 120 121 If you were to read ARGB pixels as uint32's, the alpha would be in the high byte, and the blue in the lowest byte. In memory, these are stored little endian, so 'B' is first, then 'G', 'R' and 'A' last. 122 123 When calling conversion functions, the names match the FOURCC, so in this case it would be I420ToARGB(). 124 125 All formats can be converted to/from ARGB. 126 127 Most 'planar_functions' work on ARGB (e.g. ARGBBlend). 128 129 Some are channel order agnostic (e.g. ARGBScale). 130 131 Some functions are symmetric (e.g. ARGBToBGRA is the same as BGRAToARGB, so its a macro). 132 133 ARGBBlend expects preattenuated ARGB. The R,G,B are premultiplied by alpha. Other functions don't care. 134
