int main()
{
const double V=127;
FILE * wav_file;
unsigned int sample_rate = 8000;
unsigned int num_channels = 1;
unsigned int bytes_per_sample;
unsigned int byte_rate;
unsigned int num_samples = 76000;
wav_file = fopen("out.wav", "w");
num_channels = 1; /* monoaural */
bytes_per_sample = 2;
byte_rate = sample_rate*num_channels*bytes_per_sample;
// https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
/* write RIFF header */
fwrite("RIFF", 1, 4, wav_file);
write_little_endian(36 + bytes_per_sample* num_samples*num_channels, 4, wav_file);
fwrite("WAVE", 1, 4, wav_file);
/* write fmt subchunk */
fwrite("fmt ", 1, 4, wav_file);
write_little_endian(16, 4, wav_file); /* SubChunk1Size is 16 */
write_little_endian(1, 2, wav_file); /* PCM is format 1 */
write_little_endian(num_channels, 2, wav_file);
write_little_endian(sample_rate, 4, wav_file);
write_little_endian(byte_rate, 4, wav_file);
write_little_endian(num_channels*bytes_per_sample, 2, wav_file); /* block align */
write_little_endian(8*bytes_per_sample, 2, wav_file); /* bits/sample */
/* write data subchunk */
fwrite("data", 1, 4, wav_file);
write_little_endian(bytes_per_sample* num_samples*num_channels, 4, wav_file);
////////////////////////////////////////////////////////////////
write_sound(wav_file, sample_rate, V, 8000, piano_note_to_frequency(C_4));
write_sound(wav_file, sample_rate, V, 8000, piano_note_to_frequency(E_4));
write_sound(wav_file, sample_rate, V, 4000, 0);
write_sound(wav_file, sample_rate, V, 8000, piano_note_to_frequency(G_4));
write_sound(wav_file, sample_rate, V, 4000, 0);
write_sound(wav_file, sample_rate, V, 4000, piano_note_to_frequency(G_4));
write_sound(wav_file, sample_rate, V, 4000, 0);
write_sound(wav_file, sample_rate, V, 4000, piano_note_to_frequency(G_4));
write_sound(wav_file, sample_rate, V, 4000, 0);
write_sound(wav_file, sample_rate, V, 4000, piano_note_to_frequency(G_4));
write_sound(wav_file, sample_rate, V, 24000, 0);
fclose(wav_file);
printf("done.\n");
return 0;
}
/*
* 1) Parses arguments
* 2) Opens each sound file given (or reads from stdin)
* 3) Concatenates sounds in order
* 4) Writes out sound
*/
int main(int argc, char* argv[])
{
sndtype out_type = CS229;
int i;
char c;
char* outfile = NULL;
snd_t* info = 0;
snd_t* current;
FILE* out;
while((c = getopt(argc, argv, "ho:w")) != -1)
{
switch(c)
{
case 'h':
print_usage(0);
break;
case 'o':
outfile = optarg;
break;
case 'w':
out_type = WAVE;
break;
case '?':
fprintf(stderr, "sndcat: Error: Try 'sndcat -h' for more information.\n");
exit(1);
break;
default:
print_usage(1);
}
}
/*
Get from stdin
*/
if(optind == argc)
{
info = read_sound(stdin, "Standard Input");
}
for(i = optind; i < argc; ++i)
{
if(!info)
{
info = open_sound(argv[i]);
if(!info)
{
fprintf(stderr, "sndcat: Error: %s could not be opened. Exiting.\n", argv[i]);
exit(1);
}
continue;
}
current = open_sound(argv[i]);
if(!current)
{
fprintf(stderr, "sndcat: Error: %s could not be opened. Exiting.\n", argv[i]);
exit(1);
}
concatenate(info, current);
free(current);
}
if(out_type != info->type)
{
convert(info);
}
if(!outfile)
{
out = stdout;
}
else
{
out = fopen(outfile, "wb");
}
write_sound(out, info);
close_sound(info);
if(out != stdout)
{
fclose(out);
}
return 0;
}
