Отправлено SM 24 мая 2004 г. 18:38 В ответ на: To SM(+) отправлено ADPCM 24 мая 2004 г. 18:21

// ITU-T G.726 ADPCM:
// 5-bit
static long qtab_723_40[15] = {-122, -16, 68, 139, 198, 250, 298, 339,
				378, 413, 445, 475, 502, 528, 553};
static long	_dqlntab[32] = {-2048, -66, 28, 104, 169, 224, 274, 318,
				358, 395, 429, 459, 488, 514, 539, 566,
				566, 539, 514, 488, 459, 429, 395, 358,
				318, 274, 224, 169, 104, 28, -66, -2048};
static long	_witab[32] = {448, 448, 768, 1248, 1280, 1312, 1856, 3200,
			4512, 5728, 7008, 8960, 11456, 14080, 16928, 22272,
			22272, 16928, 14080, 11456, 8960, 7008, 5728, 4512,
			3200, 1856, 1312, 1280, 1248, 768, 448, 448};
static long	_fitab[32] = {0, 0, 0, 0, 0, 0x200, 0x200, 0x200,
			0x200, 0x200, 0x400, 0x600, 0x800, 0xA00, 0xC00, 0xC00,
			0xC00, 0xC00, 0xA00, 0x800, 0x600, 0x400, 0x200, 0x200,
			0x200, 0x200, 0x200, 0, 0, 0, 0, 0};

// 4-bit
static long qtab_721[7] = {-124, 80, 178, 246, 300, 349, 400};
static long	_dqlntab[16] = {-2048, 4, 135, 213, 273, 323, 373, 425,
				425, 373, 323, 273, 213, 135, 4, -2048};
static long	_witab[16] = {-12, 18, 41, 64, 112, 198, 355, 1122,
				1122, 355, 198, 112, 64, 41, 18, -12};
static long	_fitab[16] = {0, 0, 0, 0x200, 0x200, 0x200, 0x600, 0xE00,
				0xE00, 0x600, 0x200, 0x200, 0x200, 0, 0, 0};
// 3-bit
static long qtab_723_24[3] = {8, 218, 331};
static long	_dqlntab[8] = {-2048, 135, 273, 373, 373, 273, 135, -2048};
static long	_witab[8] = {-128, 960, 4384, 18624, 18624, 4384, 960, -128};
static long	_fitab[8] = {0, 0x200, 0x400, 0xE00, 0xE00, 0x400, 0x200, 0};
// 2-bit
static short qtab_723[1] = {261};
static short   _dqlntab[4] = { 116, 365, 365, 116};
static short   _witab[4] = {-704, 14048, 14048, -704};
static short   _fitab[4] = {0, 0xE00, 0xE00, 0};