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/* dewav
Demo of libburn extension 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 <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
/* libdax_audioxtr is quite independent of libburn. It only needs
the messaging facility libdax_msgs. So we got two build variations:
*/
#ifdef Dewav_without_libburN
/* This build environment is standalone relying only on libdax components */
#include "../libburn/libdax_msgs.h"
struct libdax_msgs *libdax_messenger= NULL;
/* The API for .wav extraction */
#define LIBDAX_AUDIOXTR_H_PUBLIC 1
#include "../libburn/libdax_audioxtr.h"
#else /* Dewav_without_libburN */
/* This build environment uses libdax_msgs and libdax_audioxtr via libburn */
/* Thus the API header of libburn */
#include "../libburn/libburn.h"
#endif /* ! Dewav_without_libburN */
int main(int argc, char **argv)
{
/* This program acts as filter from in_path to out_path */
char *in_path= "", *out_path= "-";
/* The read-and-extract object for use with in_path */
struct libdax_audioxtr *xtr= NULL;
/* The file descriptor eventually detached from xtr */
int xtr_fd= -2;
/* Default output is stdout */
int out_fd= 1;
/* Inquired source parameters */
char *fmt, *fmt_info;
int num_channels, sample_rate, bits_per_sample, msb_first;
off_t data_size;
/* Auxiliary variables */
int ret, i, be_strict= 1, buf_count, detach_fd= 0, extract_all= 0;
char buf[2048];
if(argc < 2)
goto help;
for(i= 1; i<argc; i++) {
if(strcmp(argv[i],"-o")==0) {
if(i>=argc-1) {
fprintf(stderr,"%s: option -o needs a file address as argument.\n",
argv[0]);
exit(1);
}
i++;
out_path= argv[i];
} else if(strcmp(argv[i],"--lax")==0) {
be_strict= 0;
} else if(strcmp(argv[i],"--strict")==0) {
be_strict= 1;
} else if(strcmp(argv[i],"--detach_fd")==0) {
/* Test the dirty detach method. Always --extract_all */
detach_fd= 1;
} else if(strcmp(argv[i],"--extract_all")==0) {
/* Dirty : read all available bytes regardless of data_size */
extract_all= 1;
} else if(strcmp(argv[i],"--help")==0) {
help:;
fprintf(stderr,
"usage: %s [-o output_path|\"-\"] [--lax|--strict] [source_path|\"-\"]\n",
argv[0]);
exit(0);
} else {
if(in_path[0]!=0) {
fprintf(stderr,"%s: only one input file is allowed.\n", argv[0]);
exit(2);
}
in_path= argv[i];
}
}
if(in_path[0] == 0)
in_path= "-";
/* Depending on wether this was built standalone or with full libburn :
*/
#ifdef Dewav_without_libburN
/* Initialize and set up libdax messaging system */
ret= libdax_msgs_new(&libdax_messenger,0);
if(ret<=0) {
fprintf(stderr,"Failed to create libdax_messenger object.\n");
exit(3);
}
libdax_msgs_set_severities(libdax_messenger, LIBDAX_MSGS_SEV_NEVER,
LIBDAX_MSGS_SEV_NOTE, "", 0);
fprintf(stderr, "dewav on libdax\n");
#else /* Dewav_without_libburN */
/* Initialize libburn and set up its messaging system */
if(burn_initialize() == 0) {
fprintf(stderr,"Failed to initialize libburn.\n");
exit(3);
}
/* Print messages of severity NOTE or more directly to stderr */
burn_msgs_set_severities("NEVER", "NOTE", "");
fprintf(stderr, "dewav on libburn\n");
#endif /* ! Dewav_without_libburN */
/* Open audio source and create extractor object */
ret= libdax_audioxtr_new(&xtr, in_path, 0);
if(ret<=0)
exit(4);
if(strcmp(out_path,"-")!=0) {
out_fd= open(out_path, O_WRONLY | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if(out_fd == -1) {
fprintf(stderr, "Cannot open file: %s\n", out_path);
fprintf(stderr, "Error reported: '%s' (%d)\n",strerror(errno), errno);
exit(5);
}
}
/* Obtain and print parameters of audio source */
libdax_audioxtr_get_id(xtr, &fmt, &fmt_info,
&num_channels, &sample_rate, &bits_per_sample, &msb_first, 0);
fprintf(stderr, "Detected format: %s\n", fmt_info);
libdax_audioxtr_get_size(xtr, &data_size, 0);
fprintf(stderr, "Data size : %.f bytes\n", (double) data_size);
if((strcmp(fmt,".wav")!=0 && strcmp(fmt,".au")!=0) ||
num_channels!=2 || sample_rate!=44100 || bits_per_sample!=16) {
fprintf(stderr,
"%sAudio source parameters do not comply to cdrskin/README specs\n",
(be_strict ? "" : "WARNING: "));
if(be_strict)
exit(6);
}
if(msb_first==0)
fprintf(stderr,
"NOTE: Extracted data to be written with cdrskin option -swab\n");
if(detach_fd) {
/* Take over fd from xtr */;
ret= libdax_audioxtr_detach_fd(xtr, &xtr_fd, 0);
if(ret<=0) {
fprintf(stderr, "Cannot detach file descriptor from extractor\n");
exit(8);
}
/* not needed any more */
libdax_audioxtr_destroy(&xtr, 0);
fprintf(stderr, "Note: detached fd and freed extractor object.\n");
}
/* Extract and put out raw audio data */;
while(1) {
if(detach_fd) {
buf_count= read(xtr_fd, buf, sizeof(buf));
if(buf_count==-1)
fprintf(stderr,"Error while reading from detached fd\n(%d) '%s'\n",
errno, strerror(errno));
} else {
buf_count= libdax_audioxtr_read(xtr, buf, sizeof(buf), !!extract_all);
}
if(buf_count < 0)
exit(7);
if(buf_count == 0)
break;
ret= write(out_fd, buf, buf_count);
if(ret == -1) {
fprintf(stderr, "Failed to write buffer of %d bytes to: %s\n",
buf_count, out_path);
fprintf(stderr, "Error reported: '%s' (%d)\n", strerror(errno), errno);
exit(5);
}
}
/* Shutdown */
if(out_fd>2)
close(out_fd);
/* ( It is permissible to do this with xtr==NULL ) */
libdax_audioxtr_destroy(&xtr, 0);
#ifdef Dewav_without_libburN
libdax_msgs_destroy(&libdax_messenger,0);
#else /* Dewav_without_libburN */
burn_finish();
#endif /* ! Dewav_without_libburN */
exit(0);
}