pke: audio: process each tick, impl buffer copy

1 files changed, 10 insertions, 7 deletions

diff --git a/src/audio-impl-shared.cpp b/src/audio-impl-shared.cpp
index 0c3c730..b7890ac 100644
--- a/src/audio-impl-shared.cpp
+++ b/src/audio-impl-shared.cpp
@@ -1,21 +1,24 @@
 
 #include "audio-impl-shared.hpp"
 
-float pke_audio_fx_reverb(float *buffer, uint64_t buffer_len, uint64_t buffer_idx, pke_audio_fx_params_reverb *params) {
-	if (buffer_idx >= buffer_len-1) return 0.f;
+float pke_audio_fx_reverb(float *buffer, int64_t buffer_len, int64_t buffer_idx, pke_audio_fx_params_reverb *params) {
+	if (buffer_idx == 0) return 0.f;
+	if (buffer_idx >= buffer_len) return 0.f;
 	// simple feedback
 	return buffer[buffer_idx - 1] * params->reverb_strength;
 }
 
-float pke_audio_fx_delay(float *buffer, uint64_t buffer_len, uint64_t buffer_idx, pke_audio_fx_params_delay *params) {
-	if (buffer_idx >= buffer_len-1) return 0.f;
+float pke_audio_fx_delay(float *buffer, int64_t buffer_len, int64_t buffer_idx, pke_audio_fx_params_delay *params) {
+	if (buffer_idx >= buffer_len) return 0.f;
+	assert ((buffer_idx - params->delay_frames) >= 0);
+	// if (params->delay_frames > buffer_len) return 0.f;
 	return buffer[buffer_idx - params->delay_frames];
 }
 
-float pke_audio_fx_low_pass_filter(float *buffer, uint64_t buffer_len, uint64_t buffer_idx, pke_audio_fx_params_low_pass_filter *params) {
-	if (buffer_idx >= buffer_len-1) return 0.f;
+float pke_audio_fx_low_pass_filter(float *buffer, int64_t buffer_len, int64_t buffer_idx, pke_audio_fx_params_low_pass_filter *params) {
+	if (buffer_idx >= buffer_len) return 0.f;
 	float rc = 1.f / std::numbers::pi * 2.0 * params->cutoff_freq;
-	float dt = 1.f / 48000.f; // TODO reference global or pass this in
+	float dt = 1.f / PKE_AUDIO_BITRATE;
 	float alpha = dt / (rc + dt);
 	params->prev_output = (alpha * buffer[buffer_idx]) + ((1.f - alpha) * params->prev_output);
 	return params->prev_output;