Implemented a first attempt of a .wav decapitator (ticket 38)

trunk/test/dewav.c

@@ -0,0 +1,138 @@
+
+/* 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>
+
+
+/* The API of libburn */
+#include "../libburn/libburn.h"
+
+/* The API extension for .wav extraction */
+#include "../libburn/libdax_audioxtr.h"
+
+
+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;
+
+ /* Default output is stdout */
+ int out_fd= 1;
+
+ /* Inquired source parameters */
+ char *fmt, *fmt_info;
+ int num_channels, sample_rate, bits_per_sample;
+
+ /* Auxiliary variables */
+ int ret, i, be_strict= 1, buf_count;
+ 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],"--help")==0) {
+help:;
+     printf(
+     "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= "-";
+
+
+ /* Initialize libburn and set up 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", "");
+
+
+ /* 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);
+   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, 0);
+ fprintf(stderr, "Detected format: %s\n", fmt_info);
+ if((num_channels!=2 && num_channels!=4) || 
+    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);
+ }
+
+
+ /* Extract and put out raw audio data */;
+ while(1) {
+
+   buf_count= libdax_audioxtr_read(xtr, buf, sizeof(buf), 0);
+   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);
+ libdax_audioxtr_destroy(&xtr, 0);
+ burn_finish();
+ exit(0);
+}