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