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mp3_hdr: cleanups

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Return a spf value even when srate is NULL.

Based on patch by Benoît Thébaudeau [benoit thebaudeau advansee com]

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@34916 b3059339-0415-0410-9bf9-f77b7e298cf2

Make some tables const.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@34917 b3059339-0415-0410-9bf9-f77b7e298cf2

Use more appropriate types.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@34918 b3059339-0415-0410-9bf9-f77b7e298cf2

Some minor simplifications.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@34919 b3059339-0415-0410-9bf9-f77b7e298cf2

Cosmetics: fix up indentations, get rid of a few lost tabs.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@34920 b3059339-0415-0410-9bf9-f77b7e298cf2

Remove unused code from mp_get_mp3_header.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@34923 b3059339-0415-0410-9bf9-f77b7e298cf2

Author: reimar
This commit is contained in:
mplayer-svn 2012-05-18 17:14:04 +00:00 committed by wm4
parent d0525a0f59
commit 063f368398
1 changed files with 36 additions and 58 deletions
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94
libmpdemux/mp3_hdr.c
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@ -17,6 +17,7 @@
*/
#include <stdio.h>
#include <stdint.h>
#include "config.h"
#include "mp3_hdr.h"
@ -24,7 +25,7 @@
//----------------------- mp3 audio frame header parser -----------------------
static int tabsel_123[2][3][16] = {
static const uint16_t tabsel_123[2][3][16] = {
{ {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,0},
{0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,0},
{0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,0} },
@ -34,29 +35,28 @@ static int tabsel_123[2][3][16] = {
{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0} }
};
static long freqs[9] = { 44100, 48000, 32000, // MPEG 1.0
22050, 24000, 16000, // MPEG 2.0
11025, 12000, 8000}; // MPEG 2.5
static const int freqs[9] = { 44100, 48000, 32000, // MPEG 1.0
22050, 24000, 16000, // MPEG 2.0
11025, 12000, 8000}; // MPEG 2.5
/*
* return frame size or -1 (bad frame)
*/
int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate, int* spf, int* mpa_layer, int* br){
int stereo,ssize,lsf,framesize,padding,bitrate_index,sampling_frequency, divisor;
int stereo,lsf,framesize,padding,bitrate_index,sampling_frequency, divisor;
int bitrate;
int layer, mult[3] = { 12000, 144000, 144000 };
unsigned long newhead =
int layer;
static const int mult[3] = { 12000, 144000, 144000 };
uint32_t newhead =
hbuf[0] << 24 |
hbuf[1] << 16 |
hbuf[2] << 8 |
hbuf[3];
// printf("head=0x%08X\n",newhead);
// head_check:
if( (newhead & 0xffe00000) != 0xffe00000 ){
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"head_check failed\n");
return -1;
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"head_check failed\n");
return -1;
}
layer = 4-((newhead>>17)&3);
@ -65,76 +65,54 @@ int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate, int* spf, int*
return -1;
}
sampling_frequency = ((newhead>>10)&0x3); // valid: 0..2
sampling_frequency = (newhead>>10)&0x3; // valid: 0..2
if(sampling_frequency==3){
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"invalid sampling_frequency\n");
return -1;
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"invalid sampling_frequency\n");
return -1;
}
if( newhead & ((long)1<<20) ) {
if( newhead & (1<<20) ) {
// MPEG 1.0 (lsf==0) or MPEG 2.0 (lsf==1)
lsf = (newhead & ((long)1<<19)) ? 0x0 : 0x1;
sampling_frequency += (lsf*3);
lsf = !(newhead & (1<<19));
sampling_frequency += lsf*3;
} else {
// MPEG 2.5
lsf = 1;
sampling_frequency += 6;
}
// crc = ((newhead>>16)&0x1)^0x1;
bitrate_index = ((newhead>>12)&0xf); // valid: 1..14
padding = ((newhead>>9)&0x1);
// fr->extension = ((newhead>>8)&0x1);
// fr->mode = ((newhead>>6)&0x3);
// fr->mode_ext = ((newhead>>4)&0x3);
// fr->copyright = ((newhead>>3)&0x1);
// fr->original = ((newhead>>2)&0x1);
// fr->emphasis = newhead & 0x3;
bitrate_index = (newhead>>12)&0xf; // valid: 1..14
padding = (newhead>>9)&0x1;
stereo = ( (((newhead>>6)&0x3)) == 3) ? 1 : 2;
// !checked later through tabsel_123[]!
// if(!bitrate_index || bitrate_index==15){
// mp_msg(MSGT_DEMUXER,MSGL_DBG2,"Free format not supported.\n");
// return -1;
// }
if(lsf)
ssize = (stereo == 1) ? 9 : 17;
else
ssize = (stereo == 1) ? 17 : 32;
if(!((newhead>>16)&0x1)) ssize += 2; // CRC
stereo = ( ((newhead>>6)&0x3) == 3) ? 1 : 2;
bitrate = tabsel_123[lsf][layer-1][bitrate_index];
framesize = bitrate * 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]);
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;
mp_msg(MSGT_DEMUXER,MSGL_DBG2,"invalid framesize/bitrate_index\n");
return -1;
}
divisor = (layer == 3 ? (freqs[sampling_frequency] << lsf) : freqs[sampling_frequency]);
divisor = layer == 3 ? (freqs[sampling_frequency] << lsf) : freqs[sampling_frequency];
framesize /= divisor;
framesize += padding;
if(layer==1)
framesize = (framesize+padding)*4;
else
framesize += padding;
framesize *= 4;
// if(framesize<=0 || framesize>MAXFRAMESIZE) return FALSE;
if(srate) {
if(srate)
*srate = freqs[sampling_frequency];
if(spf) {
if(layer == 1)
*spf = 384;
else if(layer == 2)
*spf = 1152;
else if(*srate < 32000)
*spf = 576;
else
*spf = 1152;
}
if(spf) {
if(layer == 1)
*spf = 384;
else if(layer == 2)
*spf = 1152;
else if(sampling_frequency > 2) // not 1.0
*spf = 576;
else
*spf = 1152;
}
if(mpa_layer) *mpa_layer = layer;
if(chans) *chans = stereo;