Implemented a first attempt of a .wav decapitator (ticket 38)
This commit is contained in:
parent
6cdfb35c09
commit
9d3f1292d6
@ -29,6 +29,8 @@ libburn_libburn_la_SOURCES = \
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libburn/lec.c \
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libburn/lec.h \
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libburn/libburn.h \
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libburn/libdax_audioxtr.h \
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libburn/libdax_audioxtr.c \
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libburn/libdax_msgs.h \
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libburn/libdax_msgs.c \
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libburn/mmc.c \
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@ -95,6 +97,7 @@ libinclude_HEADERS = \
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## Build test applications
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noinst_PROGRAMS = \
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test/libburner \
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test/dewav \
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test/iso \
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test/poll \
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test/toc \
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@ -106,6 +109,9 @@ bin_PROGRAMS = \
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test_libburner_CPPFLAGS = -Ilibburn
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test_libburner_LDADD = $(libburn_libburn_la_OBJECTS) $(THREAD_LIBS)
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test_libburner_SOURCES = test/libburner.c
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test_dewav_CPPFLAGS = -Ilibburn
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test_dewav_LDADD = $(libburn_libburn_la_OBJECTS) $(THREAD_LIBS)
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test_dewav_SOURCES = test/dewav.c
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test_poll_CPPFLAGS = -Ilibburn
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test_poll_LDADD = $(libburn_libburn_la_OBJECTS) $(THREAD_LIBS)
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test_poll_SOURCES = test/poll.c
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196
libburn/libdax_audioxtr.c
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196
libburn/libdax_audioxtr.c
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@ -0,0 +1,196 @@
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/* libdax_audioxtr
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Audio track data extraction facility of libdax and libburn.
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Copyright (C) 2006 Thomas Schmitt <scdbackup@gmx.net>, provided under GPL
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "libdax_msgs.h"
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extern struct libdax_msgs *libdax_messenger;
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/* Only this single source module is entitled to do this */
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#define LIBDAX_AUDIOXTR_H_INTERNAL 1
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/* All clients of the extraction facility must do this */
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#include "libdax_audioxtr.h"
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int libdax_audioxtr_new(struct libdax_audioxtr **xtr, char *path, int flag)
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{
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int ret;
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struct libdax_audioxtr *o;
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o= *xtr= (struct libdax_audioxtr *)malloc(sizeof(struct libdax_audioxtr *));
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if(o==NULL)
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return(-1);
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strncpy(o->path,path,LIBDAX_AUDIOXTR_STRLEN-1);
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o->path[LIBDAX_AUDIOXTR_STRLEN]= 0;
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o->fd= -1;
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strcpy(o->fmt,"unidentified");
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o->fmt_info[0]= 0;
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o->wav_num_channels= 0;
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o->wav_sample_rate= 0;
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o->wav_bits_per_sample= 0;
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ret= libdax_audioxtr_open(o,0);
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if(ret<=0)
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goto failure;
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return(1);
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failure:
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libdax_audioxtr_destroy(xtr,0);
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return(-1);
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}
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int libdax_audioxtr_destroy(struct libdax_audioxtr **xtr, int flag)
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{
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struct libdax_audioxtr *o;
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o= *xtr;
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if(o==NULL)
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return(0);
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if(o->fd>=0 && strcmp(o->path,"-")!=0)
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close(o->fd);
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free((char *) o);
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*xtr= NULL;
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return(1);
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}
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static int libdax_audioxtr_open(struct libdax_audioxtr *o, int flag)
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{
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int ret;
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char msg[LIBDAX_AUDIOXTR_STRLEN+80];
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if(strcmp(o->path,"-")==0)
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o->fd= 0;
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else
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o->fd= open(o->path, O_RDONLY);
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if(o->fd<0) {
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sprintf(msg,"Cannot open audio source file : %s",o->path);
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libdax_msgs_submit(libdax_messenger,-1,0x00020200,
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LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
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msg, errno, 0);
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return(-1);
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}
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ret= libdax_audioxtr_identify(o,0);
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if(ret<=0) {
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sprintf(msg,"Audio source file has unsuitable format : %s",o->path);
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libdax_msgs_submit(libdax_messenger,-1,0x00020201,
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LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
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msg, 0, 0);
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return(0);
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}
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ret= libdax_audioxtr_init_reading(o,0);
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if(ret<=0) {
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sprintf(msg,"Failed to prepare reading of audio data : %s",o->path);
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libdax_msgs_submit(libdax_messenger,-1,0x00020202,
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LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
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msg, 0, 0);
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return(0);
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}
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return(1);
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}
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static int libdax_audioxtr_identify(struct libdax_audioxtr *o, int flag)
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{
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int ret;
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char buf[45];
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/* currently this only works for MS WAVE files .wav */
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/* info used: http://ccrma.stanford.edu/courses/422/projects/WaveFormat/ */
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ret= read(o->fd, buf, 44);
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if(ret<44)
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return(0);
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buf[44]= 0; /* as stopper for any string operations */
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if(strncmp(buf,"RIFF",4)!=0) /* ChunkID */
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return(0);
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if(strncmp(buf+8,"WAVE",4)!=0) /* Format */
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return(0);
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if(strncmp(buf+12,"fmt ",4)!=0) /* Subchunk1ID */
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return(0);
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if(buf[16]!=16 || buf[17]!=0 || buf[18]!=0 || buf[19]!=0) /* Subchunk1Size */
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return(0);
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if(buf[20]!=1 || buf[21]!=0) /* AudioFormat must be 1 (Linear quantization) */
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return(0);
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strcpy(o->fmt,".wav");
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o->wav_num_channels= libdax_audioxtr_to_int(o,(unsigned char *) buf+22,2,0);
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o->wav_sample_rate= libdax_audioxtr_to_int(o,(unsigned char *) buf+24,4,0);
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o->wav_bits_per_sample= libdax_audioxtr_to_int(o,(unsigned char *)buf+34,2,0);
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sprintf(o->fmt_info,
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".wav , num_channels=%d , sample_rate=%d , bits_per_sample=%d",
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o->wav_num_channels,o->wav_sample_rate,o->wav_bits_per_sample);
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return(1);
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}
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static unsigned libdax_audioxtr_to_int(struct libdax_audioxtr *o,
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unsigned char *bytes, int len, int flag)
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{
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unsigned int ret= 0;
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int i;
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for(i= len-1; i>=0; i--)
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ret= ret*256+bytes[i];
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return(ret);
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}
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static int libdax_audioxtr_init_reading(struct libdax_audioxtr *o, int flag)
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{
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int ret;
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/* currently this only works for MS WAVE files .wav */;
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ret= lseek(o->fd,44,SEEK_SET);
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if(ret==-1)
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return(0);
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return(1);
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}
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int libdax_audioxtr_get_id(struct libdax_audioxtr *o,
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char **fmt, char **fmt_info,
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int *num_channels, int *sample_rate, int *bits_per_sample,
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int flag)
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{
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*fmt= o->fmt;
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*fmt_info= o->fmt_info;
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if(strcmp(o->fmt,".wav")==0) {
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*num_channels= o->wav_num_channels;
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*sample_rate= o->wav_sample_rate;
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*bits_per_sample= o->wav_bits_per_sample;
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} else
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*num_channels= *sample_rate= *bits_per_sample= 0;
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return(1);
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}
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int libdax_audioxtr_read(struct libdax_audioxtr *o,
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char buffer[], int buffer_size, int flag)
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{
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int ret;
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if(buffer_size<=0 || o->fd<0)
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return(-2);
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ret= read(o->fd,buffer,buffer_size);
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return(ret);
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}
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168
libburn/libdax_audioxtr.h
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168
libburn/libdax_audioxtr.h
Normal file
@ -0,0 +1,168 @@
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/* libdax_audioxtr
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Audio track data extraction facility of libdax and libburn.
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Copyright (C) 2006 Thomas Schmitt <scdbackup@gmx.net>, provided under GPL
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*/
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#ifndef LIBDAX_AUDIOXTR_H_INCLUDED
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#define LIBDAX_AUDIOXTR_H_INCLUDED 1
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/* Public Macros */
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#define LIBDAX_AUDIOXTR_STRLEN 4096
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/* Public Opaque Handles */
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/** Extractor object encapsulating intermediate states of extraction.
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The clients of libdax_audioxtr shall only allocate pointers to this
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struct and get a storage object via libdax_audioxtr_new().
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Appropriate initial value for the pointer is NULL.
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*/
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struct libdax_audioxtr;
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/* Public Functions */
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/* Calls initiated from inside libdax/libburn */
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/* Calls from applications (to be forwarded by libdax/libburn) */
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/** Open an audio file, check wether suitable, create extractor object.
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@param xtr Opaque handle to extractor. Gets attached extractor object.
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@param path Address of the audio file to extract. "-" is stdin (but might
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be not suitable for all futurely supported formats).
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@param flag Bitfield for control purposes (unused yet, submit 0)
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@return >0 success, <=0 failure
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*/
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int libdax_audioxtr_new(struct libdax_audioxtr **xtr, char *path, int flag);
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/** Obtain identification parameters of opened audio source.
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@param xtr Opaque handle to extractor
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@param fmt Gets pointed to the audio file format id text: ".wav"
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@param fmt_info Gets pointed to a format info text telling parameters
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@param num_channels e.g. 1=mono, 2=stereo, etc
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@param sample_rate e.g. 11025, 44100
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@param bits_per_sample e.g. 8= 8 bits per sample, 16= 16 bits ...
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@param flag Bitfield for control purposes (unused yet, submit 0)
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@return >0 success, <=0 failure
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*/
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int libdax_audioxtr_get_id(struct libdax_audioxtr *xtr,
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char **fmt, char **fmt_info,
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int *num_channels, int *sample_rate,
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int *bits_per_sample, int flag);
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/** Obtain next buffer full of extracted data in desired format (only raw audio
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for now).
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@param xtr Opaque handle to extractor
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@param buffer Gets filled with extracted data
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@param buffer_size Maximum number of bytes to be filled into buffer
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@param flag Bitfield for control purposes (unused yet, submit 0)
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@return >0 number of valid buffer bytes,
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0 End of file
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-1 operating system reports error
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-2 usage error by application
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*/
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int libdax_audioxtr_read(struct libdax_audioxtr *xtr,
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char buffer[], int buffer_size, int flag);
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/** Clean up after extraction and destroy extractor object.
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@param xtr Opaque handle to extractor, *xtr is allowed to be NULL,
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*xtr is set to NULL by this function
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@param flag Bitfield for control purposes (unused yet, submit 0)
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@return 1 = destroyed object, 0 = was already destroyed
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*/
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int libdax_audioxtr_destroy(struct libdax_audioxtr **xtr, int flag);
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#ifdef LIDBAX_AUDIOXTR________________
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-- place documentation text here ---
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#endif /* LIDBAX_AUDIOXTR_________________ */
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/*
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*Never* set this macro outside libdax_audioxtr.c !
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The entrails of this facility are not to be seen by
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the other library components or the applications.
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*/
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#ifdef LIBDAX_AUDIOXTR_H_INTERNAL
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/* Internal Structures */
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/** Extractor object encapsulating intermediate states of extraction */
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struct libdax_audioxtr {
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/* Source of the encoded audio data */
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char path[LIBDAX_AUDIOXTR_STRLEN];
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/* File descriptor to path */
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int fd;
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/* Format identifier. E.g. ".wav" */
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char fmt[80];
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/* Format parameter info text */
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char fmt_info[LIBDAX_AUDIOXTR_STRLEN];
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/* Format dependent parameters */
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/* MS WAVE Format */
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/* info used: http://ccrma.stanford.edu/courses/422/projects/WaveFormat/ */
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/* 1= mono, 2= stereo, etc. */
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int wav_num_channels;
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/* 8000, 44100, etc. */
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int wav_sample_rate;
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/* 8 bits = 8, 16 bits = 16, etc. */
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int wav_bits_per_sample;
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};
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/* Internal Functions */
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/** Open the audio source pointed to by .path and evaluate suitability.
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@return -1 failure to open, 0 unsuitable format, 1 success
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*/
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static int libdax_audioxtr_open(struct libdax_audioxtr *o, int flag);
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/** Identify format and evaluate suitability.
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@return 0 unsuitable format, 1 format is suitable
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*/
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static int libdax_audioxtr_identify(struct libdax_audioxtr *o, int flag);
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/** Convert a byte string into a number (currently only little endian)
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@return The resulting number
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*/
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static unsigned libdax_audioxtr_to_int(struct libdax_audioxtr *o,
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unsigned char *bytes, int len, int flag);
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/** Prepare for reading of first buffer.
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@return 0 error, 1 success
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*/
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static int libdax_audioxtr_init_reading(struct libdax_audioxtr *o, int flag);
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#endif /* LIBDAX_AUDIOXTR_H_INTERNAL */
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#endif /* ! LIBDAX_AUDIOXTR_H_INCLUDED */
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@ -330,6 +330,11 @@ Range "scdbackup" : 0x00020000 to 0x0002ffff
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0x00020116 (FATAL,HIGH) = Track mode has unusable value
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0x00020117 (FATAL,HIGH) = toc_entry of drive is already in use
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libdax_audioxtr:
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0x00020200 (SORRY,HIGH) = Cannot open audio source file
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0x00020201 (SORRY,HIGH) = Audio source file has unsuitable format
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0x00020202 (SORRY,HIGH) = Failed to prepare reading of audio data
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------------------------------------------------------------------------------
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