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added support for mpa layers 1 and 2 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15040 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
nicodvb 2005-04-02 10:30:19 +00:00
parent 0a764d5367
commit 7affbd1748
1 changed files with 11 additions and 4 deletions
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15
libmpdemux/mp3_hdr.c
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@ -36,6 +36,7 @@ int mp_mp3_get_lsf(unsigned char* hbuf){
*/
int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate){
int stereo,ssize,lsf,framesize,padding,bitrate_index,sampling_frequency;
int layer, mult[3] = { 12000, 144000, 144000 };
unsigned long newhead =
hbuf[0] << 24 |
hbuf[1] << 16 |
@ -52,8 +53,9 @@ int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate){
}
#endif
if((4-((newhead>>17)&3))!=3){
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"not layer-3\n");
layer = 4-((newhead>>17)&3);
if(layer==4){
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"not layer-1/2/3\n");
return -1;
}
@ -97,15 +99,20 @@ int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate){
ssize = (stereo == 1) ? 17 : 32;
if(!((newhead>>16)&0x1)) ssize += 2; // CRC
framesize = tabsel_123[lsf][2][bitrate_index] * 144000;
framesize = tabsel_123[lsf][layer-1][bitrate_index] * mult[layer-1];
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"FRAMESIZE: %d, layer: %d, bitrate: %d, mult: %d\n",
framesize, layer, tabsel_123[lsf][layer-1][bitrate_index], mult[layer-1]);
if(!framesize){
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"invalid framesize/bitrate_index\n");
return -1;
}
framesize /= freqs[sampling_frequency]<<lsf;
framesize += padding;
if(layer==1)
framesize = (framesize+padding)*4;
else
framesize += padding;
// if(framesize<=0 || framesize>MAXFRAMESIZE) return FALSE;
if(srate) *srate = freqs[sampling_frequency];