[FFmpeg-devel] [PATCH 3/4] Move ff_cropTbl and ff_zigzag_direct from dsputil to mathtables.

Michael Niedermayer michaelni at gmx.at
Mon Mar 4 20:12:15 CET 2013


On Sun, Mar 03, 2013 at 03:47:11PM -0800, Ronald S. Bultje wrote:
> From: "Ronald S. Bultje" <rsbultje at gmail.com>
> 
> These are widely used throughout libavcodec, nothing dsputil-specific.
[...]
> diff --git a/libavcodec/mathtables.c b/libavcodec/mathtables.c
> index 037b135..126b05f 100644
> --- a/libavcodec/mathtables.c
> +++ b/libavcodec/mathtables.c
> @@ -87,3 +87,36 @@ const uint8_t ff_reverse[256] = {
>  0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7,
>  0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF,
>  };
> +
> +#define times4(x) x, x, x, x
> +
> +const uint8_t ff_cropTbl[256 + 2 * 1024] = {
> +times4(times4(times4(times4(times4(0x00))))),
> +0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
> +0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
> +0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
> +0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
> +0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,
> +0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,
> +0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
> +0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,
> +0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,
> +0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,
> +0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,
> +0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,
> +0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,
> +0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,
> +0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,
> +0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,
> +times4(times4(times4(times4(times4(0xFF)))))};
> +

> +const uint8_t ff_zigzag_direct[64] = {
> +  0,   1,  8, 16,  9,  2,  3, 10,
> +  17, 24, 32, 25, 18, 11,  4,  5,
> +  12, 19, 26, 33, 40, 48, 41, 34,
> +  27, 20, 13,  6,  7, 14, 21, 28,
> +  35, 42, 49, 56, 57, 50, 43, 36,
> +  29, 22, 15, 23, 30, 37, 44, 51,
> +  58, 59, 52, 45, 38, 31, 39, 46,
> +  53, 60, 61, 54, 47, 55, 62, 63
> +};

iam not sure mathtables is the best place for the zigtag table
but in absence of any better ideas ill push this in a few days

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Breaking DRM is a little like attempting to break through a door even
though the window is wide open and the only thing in the house is a bunch
of things you dont want and which you would get tomorrow for free anyway
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