346 lines
10 KiB
C
346 lines
10 KiB
C
/*
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tabinit.c: initialize tables...
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copyright ?-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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initially written by Michael Hipp
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*/
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#include "mpg123lib_intern.h"
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#include "debug.h"
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// The (normally precomputed) cos tables.
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#include "costabs.h"
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#ifdef RUNTIME_TABLES
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#include "init_costabs.h"
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#else
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const
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#endif
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real *pnts[] = { cos64,cos32,cos16,cos8,cos4 };
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static const long intwinbase[] = {
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0, -1, -1, -1, -1, -1, -1, -2, -2, -2,
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-2, -3, -3, -4, -4, -5, -5, -6, -7, -7,
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-8, -9, -10, -11, -13, -14, -16, -17, -19, -21,
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-24, -26, -29, -31, -35, -38, -41, -45, -49, -53,
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-58, -63, -68, -73, -79, -85, -91, -97, -104, -111,
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-117, -125, -132, -139, -147, -154, -161, -169, -176, -183,
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-190, -196, -202, -208, -213, -218, -222, -225, -227, -228,
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-228, -227, -224, -221, -215, -208, -200, -189, -177, -163,
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-146, -127, -106, -83, -57, -29, 2, 36, 72, 111,
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153, 197, 244, 294, 347, 401, 459, 519, 581, 645,
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711, 779, 848, 919, 991, 1064, 1137, 1210, 1283, 1356,
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1428, 1498, 1567, 1634, 1698, 1759, 1817, 1870, 1919, 1962,
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2001, 2032, 2057, 2075, 2085, 2087, 2080, 2063, 2037, 2000,
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1952, 1893, 1822, 1739, 1644, 1535, 1414, 1280, 1131, 970,
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794, 605, 402, 185, -45, -288, -545, -814, -1095, -1388,
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-1692, -2006, -2330, -2663, -3004, -3351, -3705, -4063, -4425, -4788,
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-5153, -5517, -5879, -6237, -6589, -6935, -7271, -7597, -7910, -8209,
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-8491, -8755, -8998, -9219, -9416, -9585, -9727, -9838, -9916, -9959,
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-9966, -9935, -9863, -9750, -9592, -9389, -9139, -8840, -8492, -8092,
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-7640, -7134, -6574, -5959, -5288, -4561, -3776, -2935, -2037, -1082,
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-70, 998, 2122, 3300, 4533, 5818, 7154, 8540, 9975, 11455,
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12980, 14548, 16155, 17799, 19478, 21189, 22929, 24694, 26482, 28289,
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30112, 31947, 33791, 35640, 37489, 39336, 41176, 43006, 44821, 46617,
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48390, 50137, 51853, 53534, 55178, 56778, 58333, 59838, 61289, 62684,
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64019, 65290, 66494, 67629, 68692, 69679, 70590, 71420, 72169, 72835,
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73415, 73908, 74313, 74630, 74856, 74992, 75038 };
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#ifdef OPT_MMXORSSE
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#if !defined(OPT_X86_64) && !defined(OPT_NEON) && !defined(OPT_NEON64) && !defined(OPT_AVX)
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void make_decode_tables_mmx_asm(long scaleval, float* decwin_mmx, float *decwins);
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void make_decode_tables_mmx(mpg123_handle *fr)
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{
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debug("MMX decode tables");
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/* Take care: The scale should be like before, when we didn't have float output all around. */
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make_decode_tables_mmx_asm((long)((fr->lastscale < 0 ? fr->p.outscale : fr->lastscale)*SHORT_SCALE), fr->decwin_mmx, fr->decwins);
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debug("MMX decode tables done");
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}
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#else
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/* This mimics round() as defined in C99. We stay C89. */
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static int rounded(double f)
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{
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return (int)(f>0 ? floor(f+0.5) : ceil(f-0.5));
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}
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/* x86-64 doesn't use asm version */
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void make_decode_tables_mmx(mpg123_handle *fr)
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{
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int i,j,val;
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int idx = 0;
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short *ptr = (short *)fr->decwins;
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/* Scale is always based on 1.0 . */
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double scaleval = -0.5*(fr->lastscale < 0 ? fr->p.outscale : fr->lastscale);
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debug1("MMX decode tables with scaleval %g", scaleval);
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for(i=0,j=0;i<256;i++,j++,idx+=32)
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{
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if(idx < 512+16)
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fr->decwin_mmx[idx+16] = fr->decwin_mmx[idx] = DOUBLE_TO_REAL((double) intwinbase[j] * scaleval);
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if(i % 32 == 31)
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idx -= 1023;
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if(i % 64 == 63)
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scaleval = - scaleval;
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}
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for( /* i=256 */ ;i<512;i++,j--,idx+=32)
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{
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if(idx < 512+16)
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fr->decwin_mmx[idx+16] = fr->decwin_mmx[idx] = DOUBLE_TO_REAL((double) intwinbase[j] * scaleval);
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if(i % 32 == 31)
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idx -= 1023;
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if(i % 64 == 63)
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scaleval = - scaleval;
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}
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for(i=0; i<512; i++) {
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if(i&1) val = rounded(fr->decwin_mmx[i]*0.5);
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else val = rounded(fr->decwin_mmx[i]*-0.5);
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if(val > 32767) val = 32767;
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else if(val < -32768) val = -32768;
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ptr[i] = val;
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}
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for(i=512; i<512+32; i++) {
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if(i&1) val = rounded(fr->decwin_mmx[i]*0.5);
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else val = 0;
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if(val > 32767) val = 32767;
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else if(val < -32768) val = -32768;
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ptr[i] = val;
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}
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for(i=0; i<512; i++) {
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val = rounded(fr->decwin_mmx[511-i]*-0.5);
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if(val > 32767) val = 32767;
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else if(val < -32768) val = -32768;
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ptr[512+32+i] = val;
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}
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debug("decode tables done");
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}
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#endif
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#endif
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#ifdef REAL_IS_FIXED
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/* Need saturating multiplication that keeps table values in 32 bit range,
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with the option to swap sign at will (so -2**31 is out).
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This code is far from the decoder core and so assembly optimization might
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be overkill. */
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static int32_t sat_mul32(int32_t a, int32_t b)
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{
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int64_t prod = (int64_t)a * (int64_t)b;
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/* TODO: record the clipping? An extra flag? */
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if(prod > 2147483647L) return 2147483647L;
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if(prod < -2147483647L) return -2147483647L;
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return (int32_t)prod;
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}
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#endif
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void make_decode_tables(mpg123_handle *fr)
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{
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int i,j;
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int idx = 0;
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double scaleval;
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#ifdef REAL_IS_FIXED
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real scaleval_long;
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#endif
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/* Scale is always based on 1.0 . */
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scaleval = -0.5*(fr->lastscale < 0 ? fr->p.outscale : fr->lastscale);
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debug1("decode tables with scaleval %g", scaleval);
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#ifdef REAL_IS_FIXED
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scaleval_long = DOUBLE_TO_REAL_15(scaleval);
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debug1("decode table with fixed scaleval %li", (long)scaleval_long);
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if(scaleval_long > 28618 || scaleval_long < -28618)
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{
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/* TODO: Limit the scaleval itself or limit the multiplication afterwards?
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The former basically disables significant amplification for fixed-point
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decoders, but avoids (possibly subtle) distortion. */
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/* This would limit the amplification instead:
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scaleval_long = scaleval_long < 0 ? -28618 : 28618; */
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if(NOQUIET) warning("Desired amplification may introduce distortion.");
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}
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#endif
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for(i=0,j=0;i<256;i++,j++,idx+=32)
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{
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if(idx < 512+16)
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#ifdef REAL_IS_FIXED
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fr->decwin[idx+16] = fr->decwin[idx] =
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REAL_SCALE_WINDOW(sat_mul32(intwinbase[j],scaleval_long));
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#else
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fr->decwin[idx+16] = fr->decwin[idx] = DOUBLE_TO_REAL((double) intwinbase[j] * scaleval);
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#endif
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if(i % 32 == 31)
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idx -= 1023;
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if(i % 64 == 63)
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#ifdef REAL_IS_FIXED
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scaleval_long = - scaleval_long;
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#else
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scaleval = - scaleval;
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#endif
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}
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for( /* i=256 */ ;i<512;i++,j--,idx+=32)
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{
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if(idx < 512+16)
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#ifdef REAL_IS_FIXED
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fr->decwin[idx+16] = fr->decwin[idx] =
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REAL_SCALE_WINDOW(sat_mul32(intwinbase[j],scaleval_long));
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#else
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fr->decwin[idx+16] = fr->decwin[idx] = DOUBLE_TO_REAL((double) intwinbase[j] * scaleval);
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#endif
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if(i % 32 == 31)
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idx -= 1023;
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if(i % 64 == 63)
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#ifdef REAL_IS_FIXED
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scaleval_long = - scaleval_long;
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#else
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scaleval = - scaleval;
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#endif
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}
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#if defined(OPT_X86_64) || defined(OPT_ALTIVEC) || defined(OPT_SSE) || defined(OPT_SSE_VINTAGE) || defined(OPT_ARM) || defined(OPT_NEON) || defined(OPT_NEON64) || defined(OPT_AVX)
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if( fr->cpu_opts.type == x86_64
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|| fr->cpu_opts.type == altivec
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|| fr->cpu_opts.type == sse
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|| fr->cpu_opts.type == sse_vintage
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|| fr->cpu_opts.type == arm
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|| fr->cpu_opts.type == neon
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|| fr->cpu_opts.type == neon64
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|| fr->cpu_opts.type == avx )
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{ /* for float SSE / AltiVec / ARM decoder */
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for(i=512; i<512+32; i++)
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{
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fr->decwin[i] = (i&1) ? fr->decwin[i] : 0;
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}
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for(i=0; i<512; i++)
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{
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fr->decwin[512+32+i] = -fr->decwin[511-i];
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}
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#if defined(OPT_NEON) || defined(OPT_NEON64)
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if(fr->cpu_opts.type == neon || fr->cpu_opts.type == neon64)
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{
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for(i=0; i<512; i+=2)
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{
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fr->decwin[i] = -fr->decwin[i];
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}
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}
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#endif
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}
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#endif
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debug("decode tables done");
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}
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#ifndef NO_8BIT
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int make_conv16to8_table(mpg123_handle *fr)
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{
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int i;
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int mode = fr->af.dec_enc;
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/*
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* ????: 8.0 is right but on SB cards '2.0' is a better value ???
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*/
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const double mul = 8.0;
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if(!fr->conv16to8_buf){
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fr->conv16to8_buf = (unsigned char *) malloc(8192);
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if(!fr->conv16to8_buf) {
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fr->err = MPG123_ERR_16TO8TABLE;
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if(NOQUIET) error("Can't allocate 16 to 8 converter table!");
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return -1;
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}
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fr->conv16to8 = fr->conv16to8_buf + 4096;
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}
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switch(mode)
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{
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case MPG123_ENC_ULAW_8:
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{
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double m=127.0 / log(256.0);
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int c1;
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for(i=-4096;i<4096;i++)
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{
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/* dunno whether this is a valid transformation rule ?!?!? */
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if(i < 0)
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c1 = 127 - (int) (log( 1.0 - 255.0 * (double) i*mul / 32768.0 ) * m);
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else
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c1 = 255 - (int) (log( 1.0 + 255.0 * (double) i*mul / 32768.0 ) * m);
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if(c1 < 0 || c1 > 255)
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{
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if(NOQUIET) error2("Converror %d %d",i,c1);
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return -1;
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}
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if(c1 == 0)
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c1 = 2;
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fr->conv16to8[i] = (unsigned char) c1;
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}
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}
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break;
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case MPG123_ENC_SIGNED_8:
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for(i=-4096;i<4096;i++)
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fr->conv16to8[i] = i>>5;
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break;
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case MPG123_ENC_UNSIGNED_8:
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for(i=-4096;i<4096;i++)
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fr->conv16to8[i] = (i>>5)+128;
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break;
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case MPG123_ENC_ALAW_8:
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{
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/*
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Let's believe Wikipedia (http://en.wikipedia.org/wiki/G.711) that this
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is the correct table:
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s0000000wxyza... n000wxyz [0-31] -> [0-15]
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s0000001wxyza... n001wxyz [32-63] -> [16-31]
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s000001wxyzab... n010wxyz [64-127] -> [32-47]
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s00001wxyzabc... n011wxyz [128-255] -> [48-63]
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s0001wxyzabcd... n100wxyz [256-511] -> [64-79]
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s001wxyzabcde... n101wxyz [512-1023] -> [80-95]
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s01wxyzabcdef... n110wxyz [1024-2047] -> [96-111]
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s1wxyzabcdefg... n111wxyz [2048-4095] -> [112-127]
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Let's extend to -4096, too.
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Also, bytes are xored with 0x55 for transmission.
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Since it sounds OK, I assume it is fine;-)
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*/
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for(i=0; i<64; ++i)
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fr->conv16to8[i] = ((unsigned int)i)>>1;
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for(i=64; i<128; ++i)
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fr->conv16to8[i] = ((((unsigned int)i)>>2) & 0xf) | (2<<4);
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for(i=128; i<256; ++i)
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fr->conv16to8[i] = ((((unsigned int)i)>>3) & 0xf) | (3<<4);
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for(i=256; i<512; ++i)
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fr->conv16to8[i] = ((((unsigned int)i)>>4) & 0xf) | (4<<4);
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for(i=512; i<1024; ++i)
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fr->conv16to8[i] = ((((unsigned int)i)>>5) & 0xf) | (5<<4);
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for(i=1024; i<2048; ++i)
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fr->conv16to8[i] = ((((unsigned int)i)>>6) & 0xf) | (6<<4);
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for(i=2048; i<4096; ++i)
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fr->conv16to8[i] = ((((unsigned int)i)>>7) & 0xf) | (7<<4);
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for(i=-4095; i<0; ++i)
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fr->conv16to8[i] = fr->conv16to8[-i] | 0x80;
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fr->conv16to8[-4096] = fr->conv16to8[-4095];
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for(i=-4096;i<4096;i++)
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{
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/* fr->conv16to8[i] = - i>>5; */
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/* fprintf(stderr, "table %i %i\n", i<<AUSHIFT, fr->conv16to8[i]); */
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fr->conv16to8[i] ^= 0x55;
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}
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}
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break;
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default:
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fr->err = MPG123_ERR_16TO8TABLE;
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if(NOQUIET) error("Unknown 8 bit encoding choice.");
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return -1;
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break;
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}
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return 0;
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}
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#endif
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