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THIS COMMIT IS FOR REVIEW: audio update functions clarity review in examples

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iann 2025-11-13 07:31:47 +09:00
commit b3c25186d9
1 changed files with 125 additions and 89 deletions
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42
examples/audio/audio_raw_stream.c
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@ -4,7 +4,7 @@
*
* Example complexity rating: [★★★☆] 3/4
*
* Example originally created with raylib 1.6, last time updated with raylib 4.2
* Example originally created with raylib 1.6, last time updated with raylib 6.0
*
* Example created by Ramon Santamaria (@raysan5) and reviewed by James Hofmann (@triplefox)
*
@ -24,34 +24,6 @@
#define MAX_SAMPLES 512
#define MAX_SAMPLES_PER_UPDATE 4096
// Cycles per second (hz)
float frequency = 440.0f;
// Audio frequency, for smoothing
float audioFrequency = 440.0f;
// Previous value, used to test if sine needs to be rewritten, and to smoothly modulate frequency
float oldFrequency = 1.0f;
// Index for audio rendering
float sineIdx = 0.0f;
// Audio input processing callback
void AudioInputCallback(void *buffer, unsigned int frames)
{
audioFrequency = frequency + (audioFrequency - frequency)*0.95f;
float incr = audioFrequency/44100.0f;
short *d = (short *)buffer;
for (unsigned int i = 0; i < frames; i++)
{
d[i] = (short)(32000.0f*sinf(2*PI*sineIdx));
sineIdx += incr;
if (sineIdx > 1.0f) sineIdx -= 1.0f;
}
}
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
@ -71,8 +43,6 @@ int main(void)
// Init raw audio stream (sample rate: 44100, sample size: 16bit-short, channels: 1-mono)
AudioStream stream = LoadAudioStream(44100, 16, 1);
SetAudioStreamCallback(stream, AudioInputCallback);
// Buffer for the single cycle waveform we are synthesizing
short *data = (short *)malloc(sizeof(short)*MAX_SAMPLES);
@ -84,7 +54,6 @@ int main(void)
// Position read in to determine next frequency
Vector2 mousePosition = { -100.0f, -100.0f };
/*
// Cycles per second (hz)
float frequency = 440.0f;
@ -93,7 +62,6 @@ int main(void)
// Cursor to read and copy the samples of the sine wave buffer
int readCursor = 0;
*/
// Computed size in samples of the sine wave
int waveLength = 1;
@ -124,8 +92,8 @@ int main(void)
if (frequency != oldFrequency)
{
// Compute wavelength. Limit size in both directions
//int oldWavelength = waveLength;
waveLength = (int)(22050/frequency);
int oldWavelength = waveLength;
waveLength = (int)(stream.sampleRate/frequency);
if (waveLength > MAX_SAMPLES/2) waveLength = MAX_SAMPLES/2;
if (waveLength < 1) waveLength = 1;
@ -141,11 +109,10 @@ int main(void)
}
// Scale read cursor's position to minimize transition artifacts
//readCursor = (int)(readCursor*((float)waveLength/(float)oldWavelength));
readCursor = (int)(readCursor*((float)waveLength/(float)oldWavelength));
oldFrequency = frequency;
}
/*
// Refill audio stream if required
if (IsAudioStreamProcessed(stream))
{
@ -174,7 +141,6 @@ int main(void)
// Copy finished frame to audio stream
UpdateAudioStream(stream, writeBuf, MAX_SAMPLES_PER_UPDATE);
}
*/
//----------------------------------------------------------------------------------
// Draw