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parameterize noise duration

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This commit is contained in:
Chris
2025-11-05 16:46:33 +01:00
parent 82e752f7b8
commit f7fc4cfe75
1 changed files with 14 additions and 6 deletions
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20
util/demo_noise.h
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@@ -6,29 +6,37 @@ namespace trnr {
struct demo_noise { struct demo_noise {
double samplerate; double samplerate;
int counter; int counter = 0;
// initialize with sane defaults
int noise_len_sec = 3;
int pause_len_sec = 17;
float noise_gain = 0.1f;
}; };
inline void demo_nose_init(demo_noise& d, double samplerate) inline void demo_nose_init(demo_noise& d, double samplerate)
{ {
d.samplerate = samplerate; d.samplerate = samplerate;
d.samplerate = 0; d.counter = 0;
} }
// overwrites the input buffer with noise in the specified time frame
inline void process_block(demo_noise& d, float** samples, int blocksize) inline void process_block(demo_noise& d, float** samples, int blocksize)
{ {
int noise_len_samples = d.noise_len_sec * d.samplerate;
int pause_len_samples = d.pause_len_sec * d.samplerate;
int total_len_samples = noise_len_samples + pause_len_samples;
for (int s = 0; s < blocksize; s++) { for (int s = 0; s < blocksize; s++) {
d.counter++; d.counter++;
if (d.counter == d.samplerate * 20) { d.counter = 0; } if (d.counter > total_len_samples) { d.counter = 0; }
if (d.counter > d.samplerate * 17) { if (d.counter > pause_len_samples) {
float r1 = static_cast<float>(rand()) / static_cast<float>(RAND_MAX); float r1 = static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
float r2 = static_cast<float>(rand()) / static_cast<float>(RAND_MAX); float r2 = static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
float noise = static_cast<float>(sqrt(-2.0 * log(r1)) * cos(2.0 * M_PI * r2)); float noise = static_cast<float>(sqrt(-2.0 * log(r1)) * cos(2.0 * M_PI * r2));
samples[0][s] = noise / 10.0; samples[0][s] = samples[1][s] = noise * d.noise_gain;
samples[1][s] = noise / 10.0;
} }
} }
} }