Add missing wavfile.[ch]

2 files changed, 100 insertions, 0 deletions

diff --git a/wavfile.c b/wavfile.c
new file mode 100644
index 0000000..9ea231b
--- /dev/null
+++ b/wavfile.c
@@ -0,0 +1,82 @@
+/*
+A simple sound library for CSE 20211 by Douglas Thain
+For course assignments, you should not change this file.
+For complete documentation, see:
+http://www.nd.edu/~dthain/courses/cse20211/fall2013/wavfile
+*/
+
+#include "wavfile.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct wavfile_header {
+	char	riff_tag[4];
+	int	riff_length;
+	char	wave_tag[4];
+	char	fmt_tag[4];
+	int	fmt_length;
+	short	audio_format;
+	short	num_channels;
+	int	sample_rate;
+	int	byte_rate;
+	short	block_align;
+	short	bits_per_sample;
+	char	data_tag[4];
+	int	data_length;
+};
+
+FILE * wavfile_open( const char *filename, int rate )
+{
+	struct wavfile_header header;
+
+	int samples_per_second = rate;
+	int bits_per_sample = 16;
+
+	strncpy(header.riff_tag,"RIFF",4);
+	strncpy(header.wave_tag,"WAVE",4);
+	strncpy(header.fmt_tag,"fmt ",4);
+	strncpy(header.data_tag,"data",4);
+
+	header.riff_length = 0;
+	header.fmt_length = 16;
+	header.audio_format = 1;
+	header.num_channels = 2;
+	header.sample_rate = samples_per_second;
+	header.byte_rate = samples_per_second*(bits_per_sample/8);
+	header.block_align = bits_per_sample/8;
+	header.bits_per_sample = bits_per_sample;
+	header.data_length = 0;
+
+	FILE * file = fopen(filename,"w+");
+	if(!file) return 0;
+
+	fwrite(&header,sizeof(header),1,file);
+
+	fflush(file);
+
+	return file;
+
+}
+
+void wavfile_write( FILE *file, short data[], int length )
+{
+	fwrite(data,sizeof(short),length,file);
+}
+
+void wavfile_close( FILE *file )
+{
+	int file_length = ftell(file);
+
+	int data_length = file_length - sizeof(struct wavfile_header);
+	fseek(file,sizeof(struct wavfile_header) - sizeof(int),SEEK_SET);
+	fwrite(&data_length,sizeof(data_length),1,file);
+
+	int riff_length = file_length - 8;
+	fseek(file,4,SEEK_SET);
+	fwrite(&riff_length,sizeof(riff_length),1,file);
+
+	fclose(file);
+}
+
diff --git a/wavfile.h b/wavfile.h
new file mode 100644
index 0000000..f7ba379
--- /dev/null
+++ b/wavfile.h
@@ -0,0 +1,18 @@
+/*
+A simple sound library for CSE 20211 by Douglas Thain
+For course assignments, you should not change this file.
+For complete documentation, see:
+http://www.nd.edu/~dthain/courses/cse20211/fall2013/wavfile
+*/
+
+#ifndef WAVFILE_H
+#define WAVFILE_H
+
+#include <stdio.h>
+#include <inttypes.h>
+
+FILE * wavfile_open( const char *filename, int rate );
+void wavfile_write( FILE *file, short data[], int length );
+void wavfile_close( FILE * file );
+
+#endif