diff options
Diffstat (limited to 'mp3lib/layer1.c')
| -rw-r--r-- | mp3lib/layer1.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/mp3lib/layer1.c b/mp3lib/layer1.c deleted file mode 100644 index a4be24677a..0000000000 --- a/mp3lib/layer1.c +++ /dev/null @@ -1,165 +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 ... - * - */ - -/* - * Modified for use with MPlayer, for details see the changelog at - * http://svn.mplayerhq.hu/mplayer/trunk/ - * $Id$ - * - * The above-mentioned README file has the following to say about licensing: - * - * COPYING: you may use this source under LGPL terms! - */ - -#include "mpg123.h" - -static 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 == 2) { - 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); - } -} - -static 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 == 2) { - 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; - } - for(i=fr->down_sample_sblimit;i<32;i++) - fraction[0][i] = fraction[1][i] = 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; - } - for(i=fr->down_sample_sblimit;i<32;i++) - fraction[0][i] = 0.0; - } -} - -static int do_layer1(struct frame *fr,int single) -{ - int clip=0; - int i,stereo = fr->stereo; - unsigned int balloc[2*SBLIMIT]; - unsigned int scale_index[2][SBLIMIT]; - DECLARE_ALIGNED(16, real, fraction[2][SBLIMIT]); -// int single = fr->single; - -// printf("do_layer1(0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X )\n", -// wordpointer[0],wordpointer[1],wordpointer[2],wordpointer[3],wordpointer[4],wordpointer[5],wordpointer[6],wordpointer[7]); - - 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); - - for (i=0;i<SCALE_BLOCK;i++) - { - I_step_two(fraction,balloc,scale_index,fr); - - if(single >= 0) - { - clip += (fr->synth_mono)( (real *) fraction[single],pcm_sample,&pcm_point); - } - else { - int p1 = pcm_point; - clip += (fr->synth)( (real *) fraction[0],0,pcm_sample,&p1); - clip += (fr->synth)( (real *) fraction[1],1,pcm_sample,&pcm_point); - } - - } - - return clip; -} |