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add panning support

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This commit is contained in:
Anthony Samms
2025-10-22 22:12:00 -04:00
parent 7e73ee24f1
commit 0f9cce50d9
7 changed files with 301 additions and 154 deletions
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8
libs/audio/audio.c
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@@ -18,6 +18,7 @@
#include <samplerate.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#define LOG_INFO 0
#define LOG_WARNING 1
@@ -220,13 +221,18 @@ static int port_audio_callback(const void *inputBuffer, void *outputBuffer,
if (audio_buffer->isSubBufferProcessed[currentSubBufferIndex]) {
// This part of the buffer is not ready, output silence
} else {
// Calculate pan gains (0.0 = full left, 0.5 = center, 1.0 = full right)
float left_gain = sqrtf(1.0f - audio_buffer->pan);
float right_gain = sqrtf(audio_buffer->pan);
for (unsigned long i = 0; i < framesThisPass; i++) {
unsigned long buffer_pos = ((audio_buffer->frameCursorPos + i) % audio_buffer->sizeInFrames) * AUDIO_DEVICE_CHANNELS;
unsigned long output_pos = (framesPerBuffer - framesToMix + i) * AUDIO_DEVICE_CHANNELS;
for (int ch = 0; ch < AUDIO_DEVICE_CHANNELS; ch++) {
float sample = buffer_data[buffer_pos + ch] * audio_buffer->volume;
out[output_pos + ch] += sample;
float gain = (ch == 0) ? left_gain : right_gain;
out[output_pos + ch] += sample * gain;
}
}
}