From b5367ea57e4d1769db5dde6245345aa2279e868f Mon Sep 17 00:00:00 2001
From: Karchnu <karchnu@karchnu.fr>
Date: Mon, 26 Jun 2023 12:57:07 +0200
Subject: [PATCH] Slightly improved distort.c.
---
c/distort.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 118 insertions(+), 13 deletions(-)
diff --git a/c/distort.c b/c/distort.c
index d9a386a..74d6ea3 100644
--- a/c/distort.c
+++ b/c/distort.c
@@ -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);
+}