mirror of https://github.com/mpv-player/mpv
layer-1 support
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10469 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
arpi
parent
3f0415488a
commit
bb0e90b4f7
|
|
@ -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
10
mp3lib/sr1.c
|
|
@ -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
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue