diff options
Diffstat (limited to 'src/libmpg123/layer1.c')
| -rw-r--r-- | src/libmpg123/layer1.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/src/libmpg123/layer1.c b/src/libmpg123/layer1.c deleted file mode 100644 index 50a333a0e..000000000 --- a/src/libmpg123/layer1.c +++ /dev/null @@ -1,166 +0,0 @@ -/* - * Mpeg Layer-1 audio decoder - * -------------------------- - * copyright (c) 1995 by Michael Hipp, All rights reserved. See also 'README' - * near unoptimzed ... - * - * may have a few bugs after last optimization ... - * - */ - -#include "mpg123.h" - -void I_step_one(unsigned int balloc[], unsigned int scale_index[2][SBLIMIT],struct frame *fr) -{ - unsigned int *ba=balloc; - unsigned int *sca = (unsigned int *) scale_index; - - if(fr->stereo) { - int i; - int jsbound = fr->jsbound; - for (i=0;i<jsbound;i++) { - *ba++ = getbits(4); - *ba++ = getbits(4); - } - for (i=jsbound;i<SBLIMIT;i++) - *ba++ = getbits(4); - - ba = balloc; - - for (i=0;i<jsbound;i++) { - if ((*ba++)) - *sca++ = getbits(6); - if ((*ba++)) - *sca++ = getbits(6); - } - for (i=jsbound;i<SBLIMIT;i++) - if ((*ba++)) { - *sca++ = getbits(6); - *sca++ = getbits(6); - } - } - else { - int i; - for (i=0;i<SBLIMIT;i++) - *ba++ = getbits(4); - ba = balloc; - for (i=0;i<SBLIMIT;i++) - if ((*ba++)) - *sca++ = getbits(6); - } -} - -void I_step_two(real fraction[2][SBLIMIT],unsigned int balloc[2*SBLIMIT], - unsigned int scale_index[2][SBLIMIT],struct frame *fr) -{ - int i,n; - int smpb[2*SBLIMIT]; /* values: 0-65535 */ - int *sample; - register unsigned int *ba; - register unsigned int *sca = (unsigned int *) scale_index; - - if(fr->stereo) { - int jsbound = fr->jsbound; - register real *f0 = fraction[0]; - register real *f1 = fraction[1]; - ba = balloc; - for (sample=smpb,i=0;i<jsbound;i++) { - if ((n = *ba++)) - *sample++ = getbits(n+1); - if ((n = *ba++)) - *sample++ = getbits(n+1); - } - for (i=jsbound;i<SBLIMIT;i++) - if ((n = *ba++)) - *sample++ = getbits(n+1); - - ba = balloc; - for (sample=smpb,i=0;i<jsbound;i++) { - if((n=*ba++)) - *f0++ = (real) ( ((-1)<<n) + (*sample++) + 1) * muls[n+1][*sca++]; - else - *f0++ = 0.0; - if((n=*ba++)) - *f1++ = (real) ( ((-1)<<n) + (*sample++) + 1) * muls[n+1][*sca++]; - else - *f1++ = 0.0; - } - for (i=jsbound;i<SBLIMIT;i++) { - if ((n=*ba++)) { - real samp = ( ((-1)<<n) + (*sample++) + 1); - *f0++ = samp * muls[n+1][*sca++]; - *f1++ = samp * muls[n+1][*sca++]; - } - else - *f0++ = *f1++ = 0.0; - } - } - else { - register real *f0 = fraction[0]; - ba = balloc; - for (sample=smpb,i=0;i<SBLIMIT;i++) - if ((n = *ba++)) - *sample++ = getbits(n+1); - ba = balloc; - for (sample=smpb,i=0;i<SBLIMIT;i++) { - if((n=*ba++)) - *f0++ = (real) ( ((-1)<<n) + (*sample++) + 1) * muls[n+1][*sca++]; - else - *f0++ = 0.0; - } - } -} - -void do_layer1(mpgaudio_t *mp) -{ - int clip=0; - struct frame *fr = &mp->fr; - int i,stereo = fr->stereo; - static unsigned int balloc[2*SBLIMIT]; - static unsigned int scale_index[2][SBLIMIT]; - static real fraction[2][SBLIMIT]; - int single = fr->single; - int num_bytes; - - fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? (fr->mode_ext<<2)+4 : 32; - - if(stereo == 1 || single == 3) - single = 0; - - I_step_one(balloc,scale_index,fr); - - num_bytes=0; - for (i=0;i<SCALE_BLOCK;i++) - { - I_step_two(fraction,balloc,scale_index,fr); - - if(single >= 0) { - clip += synth_1to1_mono(mp, (real*)fraction[single],mp->osspace,&num_bytes); - } - else { - int p1 = num_bytes; - clip += synth_1to1(mp, (real*)fraction[0],0,mp->osspace,&p1); - clip += synth_1to1(mp, (real*)fraction[1],1,mp->osspace,&num_bytes); - } - } - - if ((!mp->is_output_initialized) || (mp->sample_rate_device != fr->sample_rate)) { - - if (mp->is_output_initialized) - mp->ao_output->close(mp->ao_output); - - mp->ao_output->open (mp->ao_output, 16, fr->sample_rate, - stereo-1 ? AO_CAP_MODE_STEREO: AO_CAP_MODE_MONO); - mp->is_output_initialized = 1; - mp->sample_rate_device = fr->sample_rate; - - printf ("layer1\n"); - } - - mp->ao_output->write (mp->ao_output, (int16_t*)mp->osspace, num_bytes/(stereo-1 ? 4:2), - mp->pts); - mp->pts = 0; - -} - - |