layer2.c

由bmp生成mpeg2 的I_frame 数据

	table_b2_4b, table_b2_4b, table_b2_4b, table_b2_3a,
	table_b2_3a, table_b2_3a, table_b2_3a, table_b2_3a,

	table_b2_3a, table_b2_3a, table_b2_3a, table_b2_3a,
	table_b2_3a, table_b2_3a, table_b2_3a, table_b2_2,

	table_b2_2,  table_b2_2,  table_b2_2,  table_b2_2,
	table_b2_2,  table_b2_2,  table_b2_2,  table_b2_2,
};

static const int *table_b2cd[] = {
	table_b2_4c, table_b2_4c, table_b2_3b, table_b2_3b,
	table_b2_3b, table_b2_3b, table_b2_3b, table_b2_3b,
	table_b2_3b, table_b2_3b, table_b2_3b, table_b2_3b,
};

static const double table_b3[] = {
	 0.000000000, -0.000015259, -0.000015259, -0.000015259,
	-0.000015259, -0.000015259, -0.000015259, -0.000030518,
	-0.000030518, -0.000030518, -0.000030518, -0.000045776,
	-0.000045776, -0.000061035, -0.000061035, -0.000076294, /* 15 */

	-0.000076294, -0.000091553, -0.000106812, -0.000106812,
	-0.000122070, -0.000137329, -0.000152588, -0.000167847,
	-0.000198364, -0.000213623, -0.000244141, -0.000259399,
	-0.000289917, -0.000320435, -0.000366211, -0.000396729, /* 31 */

	-0.000442505, -0.000473022, -0.000534058, -0.000579834,
	-0.000625610, -0.000686646, -0.000747681, -0.000808716,
	-0.000885010, -0.000961304, -0.001037598, -0.001113892,
	-0.001205444, -0.001296997, -0.001388550, -0.001480103, /* 47 */

	-0.001586914, -0.001693726, -0.001785278, -0.001907349,
	-0.002014160, -0.002120972, -0.002243042, -0.002349854,
	-0.002456665, -0.002578735, -0.002685547, -0.002792358,
	-0.002899170, -0.002990723, -0.003082275, -0.003173828, /* 63 */

	 0.003250122,  0.003326416,  0.003387451,  0.003433228,
	 0.003463745,  0.003479004,  0.003479004,  0.003463745,
	 0.003417969,  0.003372192,  0.003280640,  0.003173828,
	 0.003051758,  0.002883911,  0.002700806,  0.002487183, /* 79 */

	 0.002227783,  0.001937866,  0.001617432,  0.001266479,
	 0.000869751,  0.000442505, -0.000030518, -0.000549316,
	-0.001098633, -0.001693726, -0.002334595, -0.003005981,
	-0.003723145, -0.004486084, -0.005294800, -0.006118774, /* 95 */

	-0.007003784, -0.007919312, -0.008865356, -0.009841919,
	-0.010848999, -0.011886597, -0.012939453, -0.014022827,
	-0.015121460, -0.016235352, -0.017349243, -0.018463135,
	-0.019577026, -0.020690918, -0.021789551, -0.022857666, /* 111 */

	-0.023910522, -0.024932861, -0.025909424, -0.026840210,
	-0.027725220, -0.028533936, -0.029281616, -0.029937744,
	-0.030532837, -0.031005859, -0.031387329, -0.031661987,
	-0.031814575, -0.031845093, -0.031738281, -0.031478882, /* 127 */

	 0.031082153,  0.030517578,  0.029785156,  0.028884888,
	 0.027801514,  0.026535034,  0.025085449,  0.023422241,
	 0.021575928,  0.019531250,  0.017257690,  0.014801025,
	 0.012115479,  0.009231567,  0.006134033,  0.002822876, /* 143 */

	-0.000686646, -0.004394531, -0.008316040, -0.012420654,
	-0.016708374, -0.021179199, -0.025817871, -0.030609131,
	-0.035552979, -0.040634155, -0.045837402, -0.051132202,
	-0.056533813, -0.061996460, -0.067520142, -0.073059082, /* 159 */

	-0.078628540, -0.084182739, -0.089706421, -0.095169067,
	-0.100540161, -0.105819702, -0.110946655, -0.115921021,
	-0.120697021, -0.125259399, -0.129562378, -0.133590698,
	-0.137298584, -0.140670776, -0.143676758, -0.146255493, /* 175 */

	-0.148422241, -0.150115967, -0.151306152, -0.151962280,
	-0.152069092, -0.151596069, -0.150497437, -0.148773193,
	-0.146362305, -0.143264771, -0.139450073, -0.134887695,
	-0.129577637, -0.123474121, -0.116577148, -0.108856201, /* 191 */

	 0.100311279,  0.090927124,  0.080688477,  0.069595337,
	 0.057617187,  0.044784546,  0.031082153,  0.016510010,
	 0.001068115, -0.015228271, -0.032379150, -0.050354004,
	-0.069168091, -0.088775635, -0.109161377, -0.130310059, /* 207 */

	-0.152206421, -0.174789429, -0.198059082, -0.221984863,
	-0.246505737, -0.271591187, -0.297210693, -0.323318481,
	-0.349868774, -0.376800537, -0.404083252, -0.431655884,
	-0.459472656, -0.487472534, -0.515609741, -0.543823242, /* 223 */

	-0.572036743, -0.600219727, -0.628295898, -0.656219482,
	-0.683914185, -0.711318970, -0.738372803, -0.765029907,
	-0.791213989, -0.816864014, -0.841949463, -0.866363525,
	-0.890090942, -0.913055420, -0.935195923, -0.956481934, /* 239 */

	-0.976852417, -0.996246338, -1.014617920, -1.031936646,
	-1.048156738, -1.063217163, -1.077117920, -1.089782715,
	-1.101211548, -1.111373901, -1.120223999, -1.127746582,
	-1.133926392, -1.138763428, -1.142211914, -1.144287109, /* 255 */

	 1.144989014,  1.144287109,  1.142211914,  1.138763428,
	 1.133926392,  1.127746582,  1.120223999,  1.111373901,
	 1.101211548,  1.089782715,  1.077117920,  1.063217163,
	 1.048156738,  1.031936646,  1.014617920,  0.996246338, /* 271 */

	 0.976852417,  0.956481934,  0.935195923,  0.913055420,
	 0.890090942,  0.866363525,  0.841949463,  0.816864014,
	 0.791213989,  0.765029907,  0.738372803,  0.711318970,
	 0.683914185,  0.656219482,  0.628295898,  0.600219727, /* 287 */

	 0.572036743,  0.543823242,  0.515609741,  0.487472534,
	 0.459472656,  0.431655884,  0.404083252,  0.376800537,
	 0.349868774,  0.323318481,  0.297210693,  0.271591187,
	 0.246505737,  0.221984863,  0.198059082,  0.174789429, /* 304 */

	 0.152206421,  0.130310059,  0.109161377,  0.088775635,
	 0.069168091,  0.050354004,  0.032379150,  0.015228271,
	-0.001068115, -0.016510010, -0.031082153, -0.044784546,
	-0.057617187, -0.069595337, -0.080688477, -0.090927124, /* 319 */

	 0.100311279,  0.108856201,  0.116577148,  0.123474121,
	 0.129577637,  0.134887695,  0.139450073,  0.143264771,
	 0.146362305,  0.148773193,  0.150497437,  0.151596069,
	 0.152069092,  0.151962280,  0.151306152,  0.150115967, /* 335 */

	 0.148422241,  0.146255493,  0.143676758,  0.140670776,
	 0.137298584,  0.133590698,  0.129562378,  0.125259399,
	 0.120697021,  0.115921021,  0.110946655,  0.105819702,
	 0.100540161,  0.095169067,  0.089706421,  0.084182739, /* 351 */

	 0.078628540,  0.073059082,  0.067520142,  0.061996460,
	 0.056533813,  0.051132202,  0.045837402,  0.040634155,
	 0.035552979,  0.030609131,  0.025817871,  0.021179199,
	 0.016708374,  0.012420654,  0.008316040,  0.004394531, /* 367 */

	 0.000686646, -0.002822876, -0.006134033, -0.009231567,
	-0.012115479, -0.014801025, -0.017257690, -0.019531250,
	-0.021575928, -0.023422241, -0.025085449, -0.026535034,
	-0.027801514, -0.028884888, -0.029785156, -0.030517578, /* 383 */

	 0.031082153,  0.031478882,  0.031738281,  0.031845093,
	 0.031814575,  0.031661987,  0.031387329,  0.031005859,
	 0.030532837,  0.029937744,  0.029281616,  0.028533936,
	 0.027725220,  0.026840210,  0.025909424,  0.024932861, /* 399 */

	 0.023910522,  0.022857666,  0.021789551,  0.020690918,
	 0.019577026,  0.018463135,  0.017349243,  0.016235352,
	 0.015121460,  0.014022827,  0.012939453,  0.011886597,
	 0.010848999,  0.009841919,  0.008865356,  0.007919312, /* 415 */

	 0.007003784,  0.006118774,  0.005294800,  0.004486084,
	 0.003723145,  0.003005981,  0.002334595,  0.001693726,
	 0.001098633,  0.000549316,  0.000030518, -0.000442505,
	-0.000869751, -0.001266479, -0.001617432, -0.001937866, /* 431 */

	-0.002227783, -0.002487183, -0.002700806, -0.002883911,
	-0.003051758, -0.003173828, -0.003280640, -0.003372192,
	-0.003417969, -0.003463745, -0.003479004, -0.003479004,
	-0.003463745, -0.003433228, -0.003387451, -0.003326416, /* 447 */

	 0.003250122,  0.003173828,  0.003082275,  0.002990723,
	 0.002899170,  0.002792358,  0.002685547,  0.002578735,
	 0.002456665,  0.002349854,  0.002243042,  0.002120972,
	 0.002014160,  0.001907349,  0.001785278,  0.001693726, /* 463 */

	 0.001586914,  0.001480103,  0.001388550,  0.001296997,
	 0.001205444,  0.001113892,  0.001037598,  0.000961304,
	 0.000885010,  0.000808716,  0.000747681,  0.000686646,
	 0.000625610,  0.000579834,  0.000534058,  0.000473022, /* 479 */

	 0.000442505,  0.000396729,  0.000366211,  0.000320435,
	 0.000289917,  0.000259399,  0.000244141,  0.000213623,
	 0.000198364,  0.000167847,  0.000152588,  0.000137329,
	 0.000122070,  0.000106812,  0.000106812,  0.000091553, /* 495 */

	 0.000076294,  0.000076294,  0.000061035,  0.000061035,
	 0.000045776,  0.000045776,  0.000030518,  0.000030518,
	 0.000030518,  0.000030518,  0.000015259,  0.000015259,
	 0.000015259,  0.000015259,  0.000015259,  0.000015259, /* 511 */
};

typedef struct {
	double       c;
	double       d;
	int          bits;
	int          step; /* denominator */
} TABLE_B4_ELEMENT;

static const TABLE_B4_ELEMENT table_b4[] = {
	{0.0,             0.0,          0,     0},
	{1.0+1.0/3.0,     1.0/2.0,      5,     3},
	{1.0+3.0/5.0,     1.0/2.0,      7,     5},
	{1.0+7.0/9.0,     1.0/2.0,     10,     9},
	{1.0+1.0/7.0,     1.0/4.0,      3,     4},
	{1.0+1.0/15.0,    1.0/8.0,      4,     8},
	{1.0+1.0/31.0,    1.0/16.0,     5,    16},
	{1.0+1.0/63.0,    1.0/32.0,     6,    32},
	{1.0+1.0/127.0,   1.0/64.0,     7,    64},
	{1.0+1.0/255.0,   1.0/128.0,    8,   128},
	{1.0+1.0/512.0,   1.0/256.0,    9,   256},
	{1.0+1.0/1023.0,  1.0/512.0,   10,   512},
	{1.0+1.0/2047.0,  1.0/1024.0,  11,  1024},
	{1.0+1.0/4095.0,  1.0/2048.0,  12,  2048},
	{1.0+1.0/9181.0,  1.0/4096.0,  13,  4096},
	{1.0+1.0/16383.0, 1.0/8192.0,  14,  8192},
	{1.0+1.0/32767.0, 1.0/16384.0, 15, 16384},
	{1.0+1.0/65535.0, 1.0/32768.0, 16, 32768},
};

static const double table_Nik[64][32] = {
	{
		 0.707106781186547573, -0.707106781186547462, -0.707106781186547684,  0.707106781186547351, 
		 0.707106781186547684, -0.707106781186547906, -0.707106781186547129,  0.707106781186547795, 
		 0.707106781186547240, -0.707106781186547795, -0.707106781186547351,  0.707106781186546352,