7
real decwin[2*(512+32)];
8
static real cos64[32],cos32[16],cos16[8],cos8[4],cos4[2];
11
static real cos64[16],cos32[8],cos16[4],cos8[2],cos4[1];
14
real *pnts[] = { cos64,cos32,cos16,cos8,cos4 };
16
static unsigned char *conv16to8_buf = NULL;
17
unsigned char *conv16to8;
19
static long intwinbase[] = {
20
0, -1, -1, -1, -1, -1, -1, -2, -2, -2,
21
-2, -3, -3, -4, -4, -5, -5, -6, -7, -7,
22
-8, -9, -10, -11, -13, -14, -16, -17, -19, -21,
23
-24, -26, -29, -31, -35, -38, -41, -45, -49, -53,
24
-58, -63, -68, -73, -79, -85, -91, -97, -104, -111,
25
-117, -125, -132, -139, -147, -154, -161, -169, -176, -183,
26
-190, -196, -202, -208, -213, -218, -222, -225, -227, -228,
27
-228, -227, -224, -221, -215, -208, -200, -189, -177, -163,
28
-146, -127, -106, -83, -57, -29, 2, 36, 72, 111,
29
153, 197, 244, 294, 347, 401, 459, 519, 581, 645,
30
711, 779, 848, 919, 991, 1064, 1137, 1210, 1283, 1356,
31
1428, 1498, 1567, 1634, 1698, 1759, 1817, 1870, 1919, 1962,
32
2001, 2032, 2057, 2075, 2085, 2087, 2080, 2063, 2037, 2000,
33
1952, 1893, 1822, 1739, 1644, 1535, 1414, 1280, 1131, 970,
34
794, 605, 402, 185, -45, -288, -545, -814, -1095, -1388,
35
-1692, -2006, -2330, -2663, -3004, -3351, -3705, -4063, -4425, -4788,
36
-5153, -5517, -5879, -6237, -6589, -6935, -7271, -7597, -7910, -8209,
37
-8491, -8755, -8998, -9219, -9416, -9585, -9727, -9838, -9916, -9959,
38
-9966, -9935, -9863, -9750, -9592, -9389, -9139, -8840, -8492, -8092,
39
-7640, -7134, -6574, -5959, -5288, -4561, -3776, -2935, -2037, -1082,
40
-70, 998, 2122, 3300, 4533, 5818, 7154, 8540, 9975, 11455,
41
12980, 14548, 16155, 17799, 19478, 21189, 22929, 24694, 26482, 28289,
42
30112, 31947, 33791, 35640, 37489, 39336, 41176, 43006, 44821, 46617,
43
48390, 50137, 51853, 53534, 55178, 56778, 58333, 59838, 61289, 62684,
44
64019, 65290, 66494, 67629, 68692, 69679, 70590, 71420, 72169, 72835,
45
73415, 73908, 74313, 74630, 74856, 74992, 75038 };
47
void make_decode_tables(long scaleval)
56
kr=0x10>>i; divv=0x40>>i;
59
costab[k] = 1.0 / (2.0 * cos(M_PI * ((double) k * 2.0 + 1.0) / (double) divv));
62
costab[k+kr] = -costab[k];
69
for(i=0,j=0;i<256;i++,j++,idx+=32)
72
decwin[idx+16] = decwin[idx] = (double) intwinbase[j] / 65536.0 * (double) scaleval;
77
scaleval = - scaleval;
80
for( /* i=256 */ ;i<512;i++,j--,idx+=32)
83
decwin[idx+16] = decwin[idx] = (double) intwinbase[j] / 65536.0 * (double) scaleval;
88
scaleval = - scaleval;
92
if(!param.down_sample) {
93
for(i=0;i<512+32;i++) {
94
decwin[512+31-i] *= 65536.0; /* allows faster clipping in 3dnow code */
95
decwin[512+32+i] = decwin[512+31-i];
102
void make_conv16to8_table(int mode)
107
* ????: 8.0 is right but on SB cards '2.0' is a better value ???
109
const double mul = 8.0;
112
conv16to8_buf = (unsigned char *) malloc(8192);
114
fprintf(stderr,"Can't allocate 16 to 8 converter table!\n");
117
conv16to8 = conv16to8_buf + 4096;
120
if(mode == AUDIO_FORMAT_ULAW_8) {
121
double m=127.0 / log(256.0);
124
for(i=-4096;i<4096;i++) {
125
/* dunno whether this is a valid transformation rule ?!?!? */
127
c1 = 127 - (int) (log( 1.0 - 255.0 * (double) i*mul / 32768.0 ) * m);
129
c1 = 255 - (int) (log( 1.0 + 255.0 * (double) i*mul / 32768.0 ) * m);
130
if(c1 < 0 || c1 > 255)
131
fprintf(stderr,"Converror %d %d\n",i,c1);
134
conv16to8[i] = (unsigned char) c1;
137
else if(mode == AUDIO_FORMAT_SIGNED_8) {
138
for(i=-4096;i<4096;i++) {
142
else if(mode == AUDIO_FORMAT_UNSIGNED_8) {
143
for(i=-4096;i<4096;i++) {
144
conv16to8[i] = (i>>5)+128;
148
for(i=-4096;i<4096;i++) {