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Add support for MPEG 1, 2, and 2.5 layers I, II, and III

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This commit is contained in:
Ron Pedde 2004-04-04 06:34:44 +00:00
parent 121866707c
commit 2627002b2c
1 changed files with 58 additions and 16 deletions
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74
src/mp3-scanner.c
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@ -73,10 +73,22 @@ typedef struct tag_scan_id3header {
/* /*
* Globals * Globals
*/ */
int scan_br_table[] = { int scan_br_table[5][16] = {
0,32,40,48,56,64,80,96,112,128,160,192,224,256,320,0 { 0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,0 }, /* MPEG1, Layer 1 */
{ 0,32,48,56,64,80,96,112,128,160,192,224,256,320,384,0 }, /* MPEG1, Layer 2 */
{ 0,32,40,48,56,64,80,96,112,128,160,192,224,256,320,0 }, /* MPEG1, Layer 3 */
{ 0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,0 }, /* MPEG2/2.5, Layer 1 */
{ 0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0 } /* MPEG2/2.5, Layer 2/3 */
}; };
int scan_sample_table[3][4] = {
{ 44100, 48000, 32000, 0 },
{ 22050, 24000, 16000, 0 },
{ 11025, 12000, 8000, 0 }
};
int scan_mode_foreground=1; int scan_mode_foreground=1;
char *scan_winamp_genre[] = { char *scan_winamp_genre[] = {
@ -891,11 +903,14 @@ int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3) {
unsigned char buffer[1024]; unsigned char buffer[1024];
int time_seconds; int time_seconds;
int index; int index;
int layer_index;
int sample_index;
int ver=0; int ver=0;
int layer=0; int layer=0;
int bitrate=0; int bitrate=0;
int samplerate=0; int samplerate=0;
int stereo=0;
if(!(infile=fopen(file,"rb"))) { if(!(infile=fopen(file,"rb"))) {
DPRINTF(ERR_WARN,"Could not open %s for reading\n",file); DPRINTF(ERR_WARN,"Could not open %s for reading\n",file);
@ -938,29 +953,56 @@ int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3) {
if((buffer[index] == 0xFF)&&(buffer[index+1] >= 224)) { if((buffer[index] == 0xFF)&&(buffer[index+1] >= 224)) {
ver=(buffer[index+1] & 0x18) >> 3; ver=(buffer[index+1] & 0x18) >> 3;
layer=(buffer[index+1] & 0x6) >> 1; layer=(buffer[index+1] & 0x6) >> 1;
if((ver==3) && (layer==1)) { /* MPEG1, Layer 3 */
layer_index=-1;
sample_index=-1;
switch(ver) {
case 0: /* MPEG Version 2.5 */
sample_index=2;
if(layer == 3)
layer_index=3;
else
layer_index=4;
break;
case 2: /* MPEG Version 2 */
sample_index=1;
if(layer == 3)
layer_index=3;
else
layer_index=4;
break;
case 3: /* MPEG Version 1 */
sample_index=0;
if(layer == 3) /* layer 1 */
layer_index=0;
if(layer == 2) /* layer 2 */
layer_index=1;
if(layer == 1) /* layer 3 */
layer_index=2;
break;
}
if(layer_index != -1) {
bitrate=(buffer[index+2] & 0xF0) >> 4; bitrate=(buffer[index+2] & 0xF0) >> 4;
bitrate=scan_br_table[bitrate]; bitrate=scan_br_table[layer_index][bitrate];
samplerate=(buffer[index+2] & 0x0C) >> 2; samplerate=(buffer[index+2] & 0x0C) >> 2;
switch(samplerate) { samplerate=scan_sample_table[sample_index][samplerate];
case 0:
samplerate=44100;
break;
case 1:
samplerate=48000;
break;
case 2:
samplerate=32000;
break;
}
pmp3->bitrate=bitrate; pmp3->bitrate=bitrate;
pmp3->samplerate=samplerate; pmp3->samplerate=samplerate;
stereo=buffer[index+3] & 0xC0 >> 6;
if(stereo == 3)
stereo=0;
else
stereo=1;
} else { } else {
/* not an mp3... */ /* not an mp3... */
DPRINTF(ERR_DEBUG,"File is not a MPEG-1/Layer III\n"); DPRINTF(ERR_DEBUG,"File is not a MPEG file\n");
return -1; return -1;
} }
/* guesstimate the file length */ /* guesstimate the file length */
time_seconds = ((int)(file_size * 8)) / (bitrate * 1024); time_seconds = ((int)(file_size * 8)) / (bitrate * 1024);
if(!pmp3->song_length) /* could have gotten it from the tag */ if(!pmp3->song_length) /* could have gotten it from the tag */