diff options
Diffstat (limited to 'components/music/decode_4to1.c')
| -rw-r--r-- | components/music/decode_4to1.c | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/components/music/decode_4to1.c b/components/music/decode_4to1.c deleted file mode 100644 index 85ed16c90..000000000 --- a/components/music/decode_4to1.c +++ /dev/null @@ -1,260 +0,0 @@ - -/* - * Mpeg Layer-1,2,3 audio decoder - * ------------------------------ - * copyright (c) 1995,1996,1997 by Michael Hipp, All rights reserved. - * See also 'README' - * version for slower machines .. decodes only every fourth sample - * dunno why it sounds THIS annoying (maybe we should adapt the window?) - * absolutely not optimized for this operation - */ - -#include <stdlib.h> -#include <math.h> -#include <string.h> - -#include "mpg123.h" - -#define WRITE_SAMPLE(samples,sum,clip) \ - if( (sum) > 32767.0) { *(samples) = 0x7fff; (clip)++; } \ - else if( (sum) < -32768.0) { *(samples) = -0x8000; (clip)++; } \ - else { *(samples) = sum; } - -int mpg123_synth_4to1_8bit(real * bandPtr, int channel, unsigned char *samples, int *pnt) -{ - short samples_tmp[16]; - short *tmp1 = samples_tmp + channel; - int i, ret; - int pnt1 = 0; - - ret = mpg123_synth_4to1(bandPtr, channel, (unsigned char *) samples_tmp, &pnt1); - samples += channel + *pnt; - - for (i = 0; i < 8; i++) - { - *samples = (*tmp1 >> 8) ^ 128; - samples += 2; - tmp1 += 2; - } - *pnt += 16; - - return ret; -} - -int mpg123_synth_4to1_8bit_mono(real * bandPtr, unsigned char *samples, int *pnt) -{ - short samples_tmp[16]; - short *tmp1 = samples_tmp; - int i, ret; - int pnt1 = 0; - - ret = mpg123_synth_4to1(bandPtr, 0, (unsigned char *) samples_tmp, &pnt1); - samples += *pnt; - - for (i = 0; i < 8; i++) - { - *samples++ = (*tmp1 >> 8) ^ 128; - tmp1 += 2; - } - *pnt += 8; - - return ret; -} - -int mpg123_synth_4to1_8bit_mono2stereo(real * bandPtr, unsigned char *samples, int *pnt) -{ - short samples_tmp[16]; - short *tmp1 = samples_tmp; - int i, ret; - int pnt1 = 0; - - ret = mpg123_synth_4to1(bandPtr, 0, (unsigned char *) samples_tmp, &pnt1); - samples += *pnt; - - for (i = 0; i < 8; i++) - { - *samples++ = (*tmp1 >> 8) ^ 128; - *samples++ = (*tmp1 >> 8) ^ 128; - tmp1 += 2; - } - *pnt += 16; - - return ret; -} - -int mpg123_synth_4to1_mono(real * bandPtr, unsigned char *samples, int *pnt) -{ - short samples_tmp[16]; - short *tmp1 = samples_tmp; - int i, ret; - int pnt1 = 0; - - ret = mpg123_synth_4to1(bandPtr, 0, (unsigned char *) samples_tmp, &pnt1); - samples += *pnt; - - for (i = 0; i < 8; i++) - { - *((short *) samples) = *tmp1; - samples += 2; - tmp1 += 2; - } - *pnt += 16; - - return ret; -} - -int mpg123_synth_4to1_mono2stereo(real * bandPtr, unsigned char *samples, int *pnt) -{ - int i, ret; - - ret = mpg123_synth_4to1(bandPtr, 0, samples, pnt); - samples = samples + *pnt - 32; - - for (i = 0; i < 8; i++) - { - ((short *) samples)[1] = ((short *) samples)[0]; - samples += 4; - } - - return ret; -} - -int mpg123_synth_4to1(real * bandPtr, int channel, unsigned char *out, int *pnt) -{ - static real buffs[2][2][0x110]; - static const int step = 2; - static int bo = 1; - short *samples = (short *) (out + *pnt); - - real *b0, (*buf)[0x110]; - int clip = 0; - int bo1; - -/* if(param.equalizer) - do_equalizer(bandPtr,channel); */ - - if (!channel) - { - bo--; - bo &= 0xf; - buf = buffs[0]; - } - else - { - samples++; - buf = buffs[1]; - } - - if (bo & 0x1) - { - b0 = buf[0]; - bo1 = bo; - mpg123_dct64(buf[1] + ((bo + 1) & 0xf), buf[0] + bo, bandPtr); - } - else - { - b0 = buf[1]; - bo1 = bo + 1; - mpg123_dct64(buf[0] + bo, buf[1] + bo + 1, bandPtr); - } - - { - register int j; - real *window = mpg123_decwin + 16 - bo1; - - for (j = 4; j; j--, b0 += 0x30, window += 0x70) - { - real sum; - - sum = *window++ * *b0++; - sum -= *window++ * *b0++; - sum += *window++ * *b0++; - sum -= *window++ * *b0++; - sum += *window++ * *b0++; - sum -= *window++ * *b0++; - sum += *window++ * *b0++; - sum -= *window++ * *b0++; - sum += *window++ * *b0++; - sum -= *window++ * *b0++; - sum += *window++ * *b0++; - sum -= *window++ * *b0++; - sum += *window++ * *b0++; - sum -= *window++ * *b0++; - sum += *window++ * *b0++; - sum -= *window++ * *b0++; - - WRITE_SAMPLE(samples, sum, clip); - samples += step; -#if 0 - WRITE_SAMPLE(samples, sum, clip); - samples += step; - WRITE_SAMPLE(samples, sum, clip); - samples += step; - WRITE_SAMPLE(samples, sum, clip); - samples += step; -#endif - } - - { - real sum; - - sum = window[0x0] * b0[0x0]; - sum += window[0x2] * b0[0x2]; - sum += window[0x4] * b0[0x4]; - sum += window[0x6] * b0[0x6]; - sum += window[0x8] * b0[0x8]; - sum += window[0xA] * b0[0xA]; - sum += window[0xC] * b0[0xC]; - sum += window[0xE] * b0[0xE]; - WRITE_SAMPLE(samples, sum, clip); - samples += step; -#if 0 - WRITE_SAMPLE(samples, sum, clip); - samples += step; - WRITE_SAMPLE(samples, sum, clip); - samples += step; - WRITE_SAMPLE(samples, sum, clip); - samples += step; -#endif - b0 -= 0x40, window -= 0x80; - } - window += bo1 << 1; - - for (j = 3; j; j--, b0 -= 0x50, window -= 0x70) - { - real sum; - - sum = -*(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - sum -= *(--window) * *b0++; - - WRITE_SAMPLE(samples, sum, clip); - samples += step; -#if 0 - WRITE_SAMPLE(samples, sum, clip); - samples += step; - WRITE_SAMPLE(samples, sum, clip); - samples += step; - WRITE_SAMPLE(samples, sum, clip); - samples += step; -#endif - } - } - - *pnt += 32; - - return clip; -} |