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-rw-r--r--mpg123_artsplugin/mpg123/tabinit.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/mpg123_artsplugin/mpg123/tabinit.c b/mpg123_artsplugin/mpg123/tabinit.c
new file mode 100644
index 00000000..4622114e
--- /dev/null
+++ b/mpg123_artsplugin/mpg123/tabinit.c
@@ -0,0 +1,139 @@
+
+#include <stdlib.h>
+
+#include "mpg123.h"
+
+static unsigned char *conv16to8_buf = NULL;
+unsigned char *conv16to8;
+
+#ifndef USE_MMX
+real decwin[512+32];
+static real cos64[16],cos32[8],cos16[4],cos8[2],cos4[1];
+
+real *pnts[] = { cos64,cos32,cos16,cos8,cos4 };
+
+
+static long intwinbase[] = {
+ 0, -1, -1, -1, -1, -1, -1, -2, -2, -2,
+ -2, -3, -3, -4, -4, -5, -5, -6, -7, -7,
+ -8, -9, -10, -11, -13, -14, -16, -17, -19, -21,
+ -24, -26, -29, -31, -35, -38, -41, -45, -49, -53,
+ -58, -63, -68, -73, -79, -85, -91, -97, -104, -111,
+ -117, -125, -132, -139, -147, -154, -161, -169, -176, -183,
+ -190, -196, -202, -208, -213, -218, -222, -225, -227, -228,
+ -228, -227, -224, -221, -215, -208, -200, -189, -177, -163,
+ -146, -127, -106, -83, -57, -29, 2, 36, 72, 111,
+ 153, 197, 244, 294, 347, 401, 459, 519, 581, 645,
+ 711, 779, 848, 919, 991, 1064, 1137, 1210, 1283, 1356,
+ 1428, 1498, 1567, 1634, 1698, 1759, 1817, 1870, 1919, 1962,
+ 2001, 2032, 2057, 2075, 2085, 2087, 2080, 2063, 2037, 2000,
+ 1952, 1893, 1822, 1739, 1644, 1535, 1414, 1280, 1131, 970,
+ 794, 605, 402, 185, -45, -288, -545, -814, -1095, -1388,
+ -1692, -2006, -2330, -2663, -3004, -3351, -3705, -4063, -4425, -4788,
+ -5153, -5517, -5879, -6237, -6589, -6935, -7271, -7597, -7910, -8209,
+ -8491, -8755, -8998, -9219, -9416, -9585, -9727, -9838, -9916, -9959,
+ -9966, -9935, -9863, -9750, -9592, -9389, -9139, -8840, -8492, -8092,
+ -7640, -7134, -6574, -5959, -5288, -4561, -3776, -2935, -2037, -1082,
+ -70, 998, 2122, 3300, 4533, 5818, 7154, 8540, 9975, 11455,
+ 12980, 14548, 16155, 17799, 19478, 21189, 22929, 24694, 26482, 28289,
+ 30112, 31947, 33791, 35640, 37489, 39336, 41176, 43006, 44821, 46617,
+ 48390, 50137, 51853, 53534, 55178, 56778, 58333, 59838, 61289, 62684,
+ 64019, 65290, 66494, 67629, 68692, 69679, 70590, 71420, 72169, 72835,
+ 73415, 73908, 74313, 74630, 74856, 74992, 75038 };
+
+void make_decode_tables(long scaleval)
+{
+ int i,j,k,kr,divv;
+ real *costab;
+ int idx;
+
+
+ for(i=0;i<5;i++)
+ {
+ kr=0x10>>i; divv=0x40>>i;
+ costab = pnts[i];
+ for(k=0;k<kr;k++)
+ costab[k] = DOUBLE_TO_REAL(1.0 / (2.0 * cos(M_PI * ((double) k * 2.0 + 1.0) / (double) divv)));
+ }
+
+ idx = 0;
+ scaleval = -scaleval;
+ for(i=0,j=0;i<256;i++,j++,idx+=32)
+ {
+ if(idx < 512+16)
+ decwin[idx+16] = decwin[idx] = DOUBLE_TO_REAL((double) intwinbase[j] / 65536.0 * (double) scaleval);
+
+ if(i % 32 == 31)
+ idx -= 1023;
+ if(i % 64 == 63)
+ scaleval = - scaleval;
+ }
+
+ for( /* i=256 */ ;i<512;i++,j--,idx+=32)
+ {
+ if(idx < 512+16)
+ decwin[idx+16] = decwin[idx] = DOUBLE_TO_REAL((double) intwinbase[j] / 65536.0 * (double) scaleval);
+
+ if(i % 32 == 31)
+ idx -= 1023;
+ if(i % 64 == 63)
+ scaleval = - scaleval;
+ }
+
+}
+#endif
+
+void make_conv16to8_table(int mode)
+{
+ int i;
+
+ /*
+ * ????: 8.0 is right but on SB cards '2.0' is a better value ???
+ */
+ const double mul = 8.0;
+
+ if(!conv16to8_buf) {
+ conv16to8_buf = (unsigned char *) malloc(8192);
+ if(!conv16to8_buf) {
+ fprintf(stderr,"Can't allocate 16 to 8 converter table!\n");
+ exit(1);
+ }
+ conv16to8 = conv16to8_buf + 4096;
+ }
+
+ if(mode == AUDIO_FORMAT_ULAW_8) {
+ double m=127.0 / log(256.0);
+ int c1;
+
+ for(i=-4096;i<4096;i++) {
+/* dunno whether this is a valid transformation rule ?!?!? */
+ if(i < 0)
+ c1 = 127 - (int) (log( 1.0 - 255.0 * (double) i*mul / 32768.0 ) * m);
+ else
+ c1 = 255 - (int) (log( 1.0 + 255.0 * (double) i*mul / 32768.0 ) * m);
+ if(c1 < 0 || c1 > 255)
+ fprintf(stderr,"Converror %d %d\n",i,c1);
+ if(c1 == 0)
+ c1 = 2;
+ conv16to8[i] = (unsigned char) c1;
+ }
+ }
+ else if(mode == AUDIO_FORMAT_SIGNED_8) {
+ for(i=-4096;i<4096;i++) {
+ conv16to8[i] = i>>5;
+ }
+ }
+ else if(mode == AUDIO_FORMAT_UNSIGNED_8) {
+ for(i=-4096;i<4096;i++) {
+ conv16to8[i] = (i>>5)+128;
+ }
+ }
+ else {
+ for(i=-4096;i<4096;i++) {
+ conv16to8[i] = 0;
+ }
+ }
+}
+
+
+