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libburn/libburn/libdax_audioxtr.c

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/* libdax_audioxtr
Audio track data extraction facility of libdax and libburn.
Copyright (C) 2006 Thomas Schmitt <scdbackup@gmx.net>, provided under GPL
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "libdax_msgs.h"
extern struct libdax_msgs *libdax_messenger;
/* Only this single source module is entitled to do this */
#define LIBDAX_AUDIOXTR_H_INTERNAL 1
/* All clients of the extraction facility must do this */
#include "libdax_audioxtr.h"
int libdax_audioxtr_new(struct libdax_audioxtr **xtr, char *path, int flag)
{
int ret= -1;
struct libdax_audioxtr *o;
o= *xtr= (struct libdax_audioxtr *) malloc(sizeof(struct libdax_audioxtr));
if(o==NULL)
return(-1);
strncpy(o->path,path,LIBDAX_AUDIOXTR_STRLEN-1);
o->path[LIBDAX_AUDIOXTR_STRLEN]= 0;
o->fd= -1;
strcpy(o->fmt,"unidentified");
o->fmt_info[0]= 0;
o->data_size= 0;
o->extract_count= 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;}
return(1);
failure:
libdax_audioxtr_destroy(xtr,0);
return(ret);
}
int libdax_audioxtr_destroy(struct libdax_audioxtr **xtr, int flag)
{
struct libdax_audioxtr *o;
o= *xtr;
if(o==NULL)
return(0);
if(o->fd>=0 && strcmp(o->path,"-")!=0)
close(o->fd);
free((char *) o);
*xtr= NULL;
return(1);
}
static int libdax_audioxtr_open(struct libdax_audioxtr *o, int flag)
{
int ret;
char msg[LIBDAX_AUDIOXTR_STRLEN+80];
if(strcmp(o->path,"-")==0)
o->fd= 0;
else
o->fd= open(o->path, O_RDONLY);
if(o->fd<0) {
sprintf(msg,"Cannot open audio source file : %s",o->path);
libdax_msgs_submit(libdax_messenger,-1,0x00020200,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, errno, 0);
return(-1);
}
ret= libdax_audioxtr_identify(o,0);
if(ret<=0) {
sprintf(msg,"Audio source file has unsuitable format : %s",o->path);
libdax_msgs_submit(libdax_messenger,-1,0x00020201,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
return(0);
}
ret= libdax_audioxtr_init_reading(o,0);
if(ret<=0) {
sprintf(msg,"Failed to prepare reading of audio data : %s",o->path);
libdax_msgs_submit(libdax_messenger,-1,0x00020202,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
return(0);
}
return(1);
}
static int libdax_audioxtr_identify_wav(struct libdax_audioxtr *o, int flag)
{
int ret;
char buf[45];
/* 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);
buf[44]= 0; /* as stopper for any string operations */
if(strncmp(buf,"RIFF",4)!=0) /* ChunkID */
return(0);
if(strncmp(buf+8,"WAVE",4)!=0) /* Format */
return(0);
if(strncmp(buf+12,"fmt ",4)!=0) /* Subchunk1ID */
return(0);
if(buf[16]!=16 || buf[17]!=0 || buf[18]!=0 || buf[19]!=0) /* Subchunk1Size */
return(0);
if(buf[20]!=1 || buf[21]!=0) /* AudioFormat must be 1 (Linear quantization) */
return(0);
strcpy(o->fmt,".wav");
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->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;
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);
}
static int libdax_audioxtr_init_reading(struct libdax_audioxtr *o, int flag)
{
int ret;
/* 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;
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);
return(1);
}
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 *msb_first, int flag)
{
*fmt= o->fmt;
*fmt_info= o->fmt_info;
*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)
{
*size= o->data_size;
return(1);
}
int libdax_audioxtr_read(struct libdax_audioxtr *o,
char buffer[], int buffer_size, int flag)
{
int ret;
if(buffer_size<=0 || o->fd<0)
return(-2);
if(o->data_size>0 && !(flag&1))
if(buffer_size > o->data_size - o->extract_count)
buffer_size= o->data_size - o->extract_count;
if(buffer_size<=0)
return(0);
ret= read(o->fd,buffer,buffer_size);
if(ret>0)
o->extract_count+= ret;
return(ret);
}
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 && strcmp(o->fmt,".au")!=0)
return(0);
if(flag&1) {
*fd= o->fd;
} else {
*fd= dup(o->fd);
if(*fd>=0 && strcmp(o->path,"-")!=0)
close(o->fd);
}
if(*fd>=0) {
o->fd= -1;
return(1);
}
return(-1);
}
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