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Slightly improved distort.c.

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This commit is contained in:
Karchnu 2023-06-26 12:57:07 +02:00
parent adfb5b249b
commit b5367ea57e
1 changed files with 118 additions and 13 deletions
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131
c/distort.c
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@ -6,18 +6,22 @@
#define BUFFER_LEN 1024
void applyOverdriveDistortion (SNDFILE *inputFile, SNDFILE *outputFile);
void applyFuzzDistortion (SNDFILE *inputFile, SNDFILE *outputFile);
void applyDistortion (SNDFILE *inputFile, SNDFILE *outputFile);
void applyBoostDistortion (SNDFILE *inputFile, SNDFILE *outputFile, float gain);
int main(int argc, char **argv) {
int distortionLevel;
SNDFILE *infile, *outfile;
SF_INFO sfinfo;
double buffer[BUFFER_LEN];
// Check for distortion level argument
if (argc < 2) {
printf("Usage: %s distortion_level\n", argv[0]);
if (argc < 3) {
printf("Usage: %s distortion-type distortion_level\n", argv[0]);
return 1;
}
distortionLevel = atoi(argv[1]);
distortionLevel = atoi(argv[2]);
// Open standard input as input file
if (!(infile = sf_open_fd(0, SFM_READ, &sfinfo, 0))) {
@ -31,16 +35,34 @@ int main(int argc, char **argv) {
return 1;
}
// Read and process data
while (sf_read_double(infile, buffer, BUFFER_LEN) > 0) {
for (int i=0; i<BUFFER_LEN; i++) {
// Add distortion to the sample
buffer[i] = buffer[i] * (1.0 + (distortionLevel/100.0) * sin(2.0 * M_PI * buffer[i]));
}
// Write the processed sample to the output file
sf_write_double(outfile, buffer, BUFFER_LEN);
if (memcmp(argv[1], "overdrive", strlen("overdrive")) == 0) {
fprintf(stderr, "overdrive\n");
applyOverdriveDistortion(infile, outfile);
}
if (memcmp(argv[1], "fuzz", strlen("fuzz")) == 0) {
fprintf(stderr, "fuzz\n");
applyFuzzDistortion(infile, outfile);
}
if (memcmp(argv[1], "distortion", strlen("distortion")) == 0) {
fprintf(stderr, "distortion\n");
applyDistortion(infile, outfile);
}
if (memcmp(argv[1], "boost", strlen("boost")) == 0) {
fprintf(stderr, "boost\n");
applyBoostDistortion(infile, outfile, distortionLevel);
}
// // Read and process data
// double buffer[BUFFER_LEN];
// while (sf_read_double(infile, buffer, BUFFER_LEN) > 0) {
// for (int i=0; i<BUFFER_LEN; i++) {
// // Add distortion to the sample
// buffer[i] = buffer[i] * (1.0 + (distortionLevel/100.0) * sin(2.0 * M_PI * buffer[i]));
// }
//
// // Write the processed sample to the output file
// sf_write_double(outfile, buffer, BUFFER_LEN);
// }
// Close files
sf_close(infile);
@ -48,3 +70,86 @@ int main(int argc, char **argv) {
return 0;
}
// TODO: use these functions
// function to apply overdrive distortion to an audio signal using sndfile API
void applyOverdriveDistortion(SNDFILE *inputFile, SNDFILE *outputFile)
{
// read in the data from the input file
int bufferSize = 1024;
float *inputBuffer = malloc(bufferSize * sizeof(float));
int framesRead;
while ((framesRead = sf_readf_float(inputFile, inputBuffer, bufferSize))) {
// apply overdrive distortion
for (int i = 0; i < framesRead; i++) {
float x = inputBuffer[i];
float y = (1 + x) * (1 + x) / (1 + 2 * x + x * x);
inputBuffer[i] = y;
}
// write processed data to output file
sf_writef_float(outputFile, inputBuffer, framesRead);
}
free(inputBuffer);
}
// function to apply fuzz distortion to an audio signal using sndfile API
void applyFuzzDistortion(SNDFILE *inputFile, SNDFILE *outputFile)
{
// read in the data from the input file
int bufferSize = 1024;
float *inputBuffer = malloc(bufferSize * sizeof(float));
int framesRead;
while ((framesRead = sf_readf_float(inputFile, inputBuffer, bufferSize))) {
// apply fuzz distortion
for (int i = 0; i < framesRead; i++) {
float x = inputBuffer[i];
float y = x / (1 + fabs(x));
inputBuffer[i] = y;
}
// write processed data to output file
sf_writef_float(outputFile, inputBuffer, framesRead);
}
free(inputBuffer);
}
// function to apply distortion to an audio signal using sndfile API
void applyDistortion(SNDFILE *inputFile, SNDFILE *outputFile)
{
// read in the data from the input file
int bufferSize = 1024;
float *inputBuffer = malloc(bufferSize * sizeof(float));
int framesRead;
while ((framesRead = sf_readf_float(inputFile, inputBuffer, bufferSize))) {
// apply distortion
for (int i = 0; i < framesRead; i++) {
float x = inputBuffer[i];
float y = x / (1 + fabs(x));
y = y * 0.5 + 0.5;
inputBuffer[i] = y;
}
// write processed data to output file
sf_writef_float(outputFile, inputBuffer, framesRead);
}
free(inputBuffer);
}
// function to apply boost to an audio signal using sndfile API
void applyBoostDistortion(SNDFILE *inputFile, SNDFILE *outputFile, float gain)
{
// read in the data from the input file
int bufferSize = 1024;
float *inputBuffer = malloc(bufferSize * sizeof(float));
int framesRead;
while ((framesRead = sf_readf_float(inputFile, inputBuffer, bufferSize))) {
// apply boost
for (int i = 0; i < framesRead; i++) {
float x = inputBuffer[i];
float y = x * gain;
inputBuffer[i] = y;
}
// write processed data to output file
sf_writef_float(outputFile, inputBuffer, framesRead);
}
free(inputBuffer);
}