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begin parsing work on AAC info parsing 

git-svn-id: https://svn.musicpd.org/mpd/trunk@345 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
Warren Dukes 2004-03-21 16:34:06 +00:00
parent 9ab67e7581
commit 1bb75913c3
1 changed files with 105 additions and 1 deletions
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106
src/tag.c
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@ -173,7 +173,111 @@ MpdTag * mp3TagDup(char * utf8file) {
#endif
#ifdef HAVE_FAAD
/* copied from FAAD2 frontend */
typedef struct {
long bytesIntoBuffer;
long bytesConsumed;
long fileOffset;
unsigned char *buffer;
int atEof;
FILE *infile;
} AacBuffer;
void fillAacBuffer(AacBuffer *b) {
if(b->bytesConsumed > 0) {
int bread;
if(b->bytesIntoBuffer) {
memmove((void *)b->buffer,(void*)(b->buffer+
b->bytesConsumed),b->bytesIntoBuffer);
}
if(!b->atEof) {
bread = fread((void *)(b->buffer+b->bytesIntoBuffer),1,
b->bytesConsumed,b->infile);
if(bread!=b->bytesConsumed) b->atEof = 1;
b->bytesIntoBuffer+=bread;
}
b->bytesConsumed = 0;
if(b->bytesIntoBuffer > 3) {
if(memcmp(b->buffer,"TAG",3)==0) b->bytesIntoBuffer = 0;
}
if(b->bytesIntoBuffer > 11) {
if(memcmp(b->buffer,"LYRICSBEGIN",11)==0) {
b->bytesIntoBuffer = 0;
}
}
if(b->bytesIntoBuffer > 8) {
if(memcmp(b->buffer,"APETAGEX",8)==0) {
b->bytesIntoBuffer = 0;
}
}
}
}
void advanceAacBuffer(AacBuffer * b, int bytes) {
b->fileOffset+=bytes;
b->bytesConsumed = bytes;
b->bytesIntoBuffer-=bytes;
}
static int adtsSampleRates[] = {96000,88200,64000,48000,44100,32000,24000,22050,
16000,12000,11025,8000,7350,0,0,0};
int adtsParse(AacBuffer * b, float * length) {
int frames, frameLength;
int tFrameLength = 0;
int sampleRate = 0;
float framesPerSec, bytesPerFrame;
/* Read all frames to ensure correct time and bitrate */
for(frames = 0; ;frames++) {
fillAacBuffer(b);
if(b->bytesIntoBuffer > 7) {
/* check syncword */
if (!((b->buffer[0] == 0xFF) &&
((b->buffer[1] & 0xF6) == 0xF0)))
{
break;
}
if(frames==0) {
sampleRate = adtsSampleRates[
(b->buffer[2]&0x3c)>>2];
}
frameLength = ((((unsigned int)b->buffer[3] & 0x3))
<< 11) | (((unsigned int)b->buffer[4])
<< 3) | (b->buffer[5] >> 5);
tFrameLength+=frameLength;
if(frameLength > b->bytesIntoBuffer) break;
advanceAacBuffer(b,frameLength);
}
else break;
}
framesPerSec = (float)sampleRate/1024.0;
if(frames!=0) {
bytesPerFrame = (float)tFrameLength/(float)(frames*1000);
}
else bytesPerFrame = 0;
if(framesPerSec!=0) *length = (float)frames/framesPerSec;
else *length = 1;
return 1;
}
MpdTag * aacTagDup(char * utf8file) {
MpdTag * ret = NULL;
return ret;
}
MpdTag * mp4DataDup(char * utf8file, int * mp4MetadataFound) {
MpdTag * ret = NULL;
FILE * fh;