inline void Assembler::emit_int32(int x) {
check_delay();
AbstractAssembler::emit_int32(x);
}
int main (int argc, char ** argv)
{
int opts = 0;
int delay = 8000;
short volume = 4;
// Get the arguments
while((opts = getopt(argc, argv,"d:v: tt")) != -1)
{
if (opts == 'd')
{
delay = atoi(optarg);
}
else if (opts == 'v')
{
volume = atoi(optarg);
}
}
// Make sure delay is not negative
// Make sure volume scale is at least 1
check_delay(&delay);
check_volume(&volume);
// Open the files in binary mode to read, or write
FILE *source = fopen(argv[optind], "rb");
FILE *dest = fopen(argv[optind+1], "wb");
// Handle incorrect source file input
check_source(&source);
// READ header from source - first 44 bytes as 11 ints
int header[11] = {0};
fread(header, sizeof(int), 11, source);
// Change file size in the header
header[1] += delay*2;
header[10] += delay*2;
// WRITE header to output file
fwrite(header, sizeof(int), 11, dest);
// Allocate mem to store delay number of shorts
short *buffer;
buffer = malloc((sizeof(short) * delay));
// Copy samples before DELAY num of samples into buffer
fseek(source, 44, SEEK_SET); // 44 bytes from start of file
fread(buffer, sizeof(short), delay, source);
// START READING THE SAMPLES ONE AT A TIME.
fseek(source, 44, SEEK_SET); // 44 bytes from start of file
short smp = 0; // This will hold the sample being read
int s = 0; // Keeps track of the NUMBER OF samples read
while (fread(&smp, sizeof(short), 1, source))
{
if (s < delay)
{
// If not at sample number DELAY yet, just write as they are...
fwrite(&smp, sizeof(short), 1, dest);
}
else
{
// At sample number DELAY, write mixed in buffer[0] scaled by volume
short temp = smp + (buffer[0] / volume);
fwrite(&temp, sizeof(short), 1, dest);
}
// START OF BUFFER CODE
// Append smp to the buffer AFTER "popping it"
int i = 0;
for (i = 0; i < delay-1; i++)
{
buffer[i] = buffer[i+1];
}
buffer[delay-1] = smp;
// EOF BUFFER CODE
s++; // Increment the number of samples
}
// Write the rest of the buffer scaled by volume to dest
int i = 0;
for (i = 0; i < delay; i++)
{
buffer[i] /= volume;
}
fwrite(buffer, sizeof(short), delay, dest);
return 0;
}
