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Introduced extraction of .au (but not its usage within cdrskin)

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This commit is contained in:
Thomas Schmitt
2006-10-24 07:50:31 +00:00
parent f78cc40041
commit 0d26beb2ed
5 changed files with 148 additions and 45 deletions
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138
libburn/libdax_audioxtr.c
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@ -41,11 +41,16 @@ int libdax_audioxtr_new(struct libdax_audioxtr **xtr, char *path, int flag)
o->data_size= 0;
o->extract_count= 0;
o->wav_num_channels= 0;
o->wav_sample_rate= 0;
o->wav_bits_per_sample= 0;
o->num_channels= 0;
o->sample_rate= 0;
o->bits_per_sample= 0;
o->msb_first= 0;
o->wav_subchunk2_size= 0;
o->au_data_location= 0;
o->au_data_size= 0xffffffff;
ret= libdax_audioxtr_open(o,0);
if(ret<=0)
{ret= -2*(ret<0); goto failure;}
@ -108,14 +113,19 @@ static int libdax_audioxtr_open(struct libdax_audioxtr *o, int flag)
}
static int libdax_audioxtr_identify(struct libdax_audioxtr *o, int flag)
static int libdax_audioxtr_identify_wav(struct libdax_audioxtr *o, int flag)
{
int ret;
char buf[45];
/* currently this only works for MS WAVE files .wav */
/* check wether this is a MS WAVE file .wav */
/* info used: http://ccrma.stanford.edu/courses/422/projects/WaveFormat/ */
if(o->fd!=0) {
ret= lseek(o->fd,0,SEEK_SET);
if(ret==-1)
return(0);
}
ret= read(o->fd, buf, 44);
if(ret<44)
return(0);
@ -133,27 +143,99 @@ static int libdax_audioxtr_identify(struct libdax_audioxtr *o, int flag)
return(0);
strcpy(o->fmt,".wav");
o->wav_num_channels= libdax_audioxtr_to_int(o,(unsigned char *) buf+22,2,0);
o->wav_sample_rate= libdax_audioxtr_to_int(o,(unsigned char *) buf+24,4,0);
o->wav_bits_per_sample= libdax_audioxtr_to_int(o,(unsigned char *)buf+34,2,0);
o->msb_first= 0;
o->num_channels= libdax_audioxtr_to_int(o,(unsigned char *) buf+22,2,0);
o->sample_rate= libdax_audioxtr_to_int(o,(unsigned char *) buf+24,4,0);
o->bits_per_sample= libdax_audioxtr_to_int(o,(unsigned char *)buf+34,2,0);
sprintf(o->fmt_info,
".wav , num_channels=%d , sample_rate=%d , bits_per_sample=%d",
o->wav_num_channels,o->wav_sample_rate,o->wav_bits_per_sample);
o->num_channels,o->sample_rate,o->bits_per_sample);
o->wav_subchunk2_size= libdax_audioxtr_to_int(o,(unsigned char *)buf+40,4,0);
o->data_size= o->wav_subchunk2_size;
return(1);
}
static int libdax_audioxtr_identify_au(struct libdax_audioxtr *o, int flag)
{
int ret,encoding;
char buf[24];
/* Check wether this is a Sun Audio, .au file */
/* info used: http://ccrma.stanford.edu/courses/422/projects/WaveFormat/ */
if(o->fd!=0) {
ret= lseek(o->fd,0,SEEK_SET);
if(ret==-1)
return(0);
}
ret= read(o->fd, buf, 24);
if(ret<24)
return(0);
if(strncmp(buf,".snd",4)!=0)
return(0);
strcpy(o->fmt,".au");
o->msb_first= 1;
o->au_data_location= libdax_audioxtr_to_int(o,(unsigned char *)buf+4,4,1);
o->au_data_size= libdax_audioxtr_to_int(o,(unsigned char *)buf+8,4,1);
encoding= libdax_audioxtr_to_int(o,(unsigned char *)buf+12,4,1);
if(encoding==2)
o->bits_per_sample= 8;
else if(encoding==3)
o->bits_per_sample= 16;
else if(encoding==4)
o->bits_per_sample= 24;
else if(encoding==5)
o->bits_per_sample= 32;
else
o->bits_per_sample= -encoding;
o->sample_rate= libdax_audioxtr_to_int(o,(unsigned char *)buf+16,4,1);
o->num_channels= libdax_audioxtr_to_int(o,(unsigned char *)buf+20,4,1);
if(o->au_data_size!=0xffffffff)
o->data_size= o->au_data_size;
else
o->data_size= 0;
sprintf(o->fmt_info,
".au , num_channels=%d , sample_rate=%d , bits_per_sample=%d",
o->num_channels,o->sample_rate,o->bits_per_sample);
/* <<< for testing only */;
return(1);
return(o->bits_per_sample>0); /* Audio format must be linear PCM */
}
static int libdax_audioxtr_identify(struct libdax_audioxtr *o, int flag)
{
int ret;
ret= libdax_audioxtr_identify_wav(o, 0);
if(ret!=0)
return(ret);
if(o->fd==0) /* cannot rewind stdin */
return(0);
ret= libdax_audioxtr_identify_au(o, 0);
if(ret!=0)
return(ret);
return(0);
}
/* @param flag bit0=msb_first */
static unsigned libdax_audioxtr_to_int(struct libdax_audioxtr *o,
unsigned char *bytes, int len, int flag)
{
unsigned int ret= 0;
int i;
for(i= len-1; i>=0; i--)
ret= ret*256+bytes[i];
if(flag&1)
for(i= 0; i<len; i++)
ret= ret*256+bytes[i];
else
for(i= len-1; i>=0; i--)
ret= ret*256+bytes[i];
return(ret);
}
@ -162,12 +244,18 @@ static int libdax_audioxtr_init_reading(struct libdax_audioxtr *o, int flag)
{
int ret;
/* currently this only works for MS WAVE files .wav */;
/* currently this only works for MS WAVE files .wav and Sun .au*/;
if(o->fd==0) /* stdin: hope no read came after libdax_audioxtr_identify() */
return(1);
o->extract_count= 0;
ret= lseek(o->fd,44,SEEK_SET);
if(strcmp(o->fmt,".wav")==0)
ret= lseek(o->fd,44,SEEK_SET);
else if(strcmp(o->fmt,".au")==0)
ret= lseek(o->fd,o->au_data_location,SEEK_SET);
else
ret= -1;
if(ret==-1)
return(0);
@ -178,28 +266,22 @@ static int libdax_audioxtr_init_reading(struct libdax_audioxtr *o, int flag)
int libdax_audioxtr_get_id(struct libdax_audioxtr *o,
char **fmt, char **fmt_info,
int *num_channels, int *sample_rate, int *bits_per_sample,
int flag)
int *msb_first, int flag)
{
*fmt= o->fmt;
*fmt_info= o->fmt_info;
if(strcmp(o->fmt,".wav")==0) {
*num_channels= o->wav_num_channels;
*sample_rate= o->wav_sample_rate;
*bits_per_sample= o->wav_bits_per_sample;
} else
*num_channels= *sample_rate= *bits_per_sample= 0;
*num_channels= o->num_channels;
*sample_rate= o->sample_rate;
*bits_per_sample= o->bits_per_sample;
*msb_first= o->msb_first;
return(1);
}
int libdax_audioxtr_get_size(struct libdax_audioxtr *o, off_t *size, int flag)
{
if(strcmp(o->fmt,".wav")==0) {
*size= o->wav_subchunk2_size;
return(1);
}
*size= 0;
return(0);
*size= o->data_size;
return(1);
}
@ -226,7 +308,7 @@ int libdax_audioxtr_detach_fd(struct libdax_audioxtr *o, int *fd, int flag)
{
if(o->fd<0)
return(-1);
if(strcmp(o->fmt,".wav")!=0)
if(strcmp(o->fmt,".wav")!=0 && strcmp(o->fmt,".au")!=0)
return(0);
if(flag&1) {
*fd= o->fd;