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layer-1 support

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10469 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
arpi 2003-07-24 22:12:59 +00:00
parent 3f0415488a
commit bb0e90b4f7
2 changed files with 162 additions and 5 deletions
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157
mp3lib/layer1.c Normal file
View File

@ -0,0 +1,157 @@
/*
* 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"
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) {
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) {
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];
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;
}

10
mp3lib/sr1.c
View File

@ -271,8 +271,9 @@ switch(fr->lay){
MP3_samplerate=freqs[fr->sampling_frequency];
fr->framesize = (long) MP3_bitrate * 12000;
fr->framesize /= MP3_samplerate;
MP3_framesize = fr->framesize;
fr->framesize = ((fr->framesize+fr->padding)<<2)-4;
MP3_framesize = ((fr->framesize+fr->padding)<<2);
fr->framesize = MP3_framesize-4;
printf("framesize=%d\n",fr->framesize);
break;
default:
MP3_framesize=fr->framesize=0;
@ -375,6 +376,7 @@ int _has_mmx = 0; // used by layer2.c, layer3.c to pre-scale coeffs
#include "layer2.c"
#include "layer3.c"
#include "layer1.c"
/******************************************************************************/
/* PUBLIC FUNCTIONS */
@ -516,9 +518,7 @@ int MP3_DecodeFrame(unsigned char *hova,short single){
switch(fr.lay){
case 2: do_layer2(&fr,single);break;
case 3: do_layer3(&fr,single);break;
case 1:
printf("mp3lib: layer-1 audio not yet supported!\n");
return 4608;
case 1: do_layer1(&fr,single);break;
default:
return 0; // unsupported
}