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#include "effect_stereo_enhancer.h"
//process
bool AudioEffectStereoEnhancer::has_secondary_input() const {
return false;
}
void AudioEffectStereoEnhancer::process(const Event *p_events, int p_event_count, const AudioFrame *p_in, AudioFrame *p_out, bool p_prev_active) {
float intensity = control_ports[CONTROL_PORT_PAN_PULLOUT].value;
bool surround_mode = control_ports[CONTROL_PORT_SURROUND].value > 0;
float surround_amount = control_ports[CONTROL_PORT_SURROUND].value;
unsigned int delay_frames = (control_ports[CONTROL_PORT_SURROUND].value / 1000.0) * sampling_rate;
for (int i = 0; i < block_size; i++) {
float l = p_in[i].l;
float r = p_in[i].r;
float center = (l + r) / 2.0f;
l = (center + (l - center) * intensity);
r = (center + (r - center) * intensity);
if (surround_mode) {
float val = (l + r) / 2.0;
delay_ringbuff[ringbuff_pos & ringbuff_mask] = val;
float out = delay_ringbuff[(ringbuff_pos - delay_frames) & ringbuff_mask] * surround_amount;
l += out;
r += -out;
} else {
float val = r;
delay_ringbuff[ringbuff_pos & ringbuff_mask] = val;
//r is delayed
r = delay_ringbuff[(ringbuff_pos - delay_frames) & ringbuff_mask];
;
}
p_out[i].l = l;
p_out[i].r = r;
ringbuff_pos++;
}
}
void AudioEffectStereoEnhancer::process_with_secondary(const Event *p_events, int p_event_count, const AudioFrame *p_in, const AudioFrame *p_secondary, AudioFrame *p_out, bool p_prev_active) {
}
void AudioEffectStereoEnhancer::set_process_block_size(int p_size) {
block_size = p_size;
}
void AudioEffectStereoEnhancer::set_sampling_rate(int p_hz) {
if (sampling_rate != p_hz) {
sampling_rate = p_hz;
_update_buffers();
}
}
//info
String AudioEffectStereoEnhancer::get_name() const {
return "StereoEnh";
}
String AudioEffectStereoEnhancer::get_unique_id() const {
return "stereo_enhancer";
}
String AudioEffectStereoEnhancer::get_provider_id() const {
return "internal";
}
int AudioEffectStereoEnhancer::get_control_port_count() const {
return CONTROL_PORT_MAX;
}
ControlPort *AudioEffectStereoEnhancer::get_control_port(int p_port) {
ERR_FAIL_INDEX_V(p_port, CONTROL_PORT_MAX, NULL);
return &control_ports[p_port];
}
void AudioEffectStereoEnhancer::reset() {
_update_buffers();
}
/* Load/Save */
JSON::Node AudioEffectStereoEnhancer::to_json() const {
JSON::Node node = JSON::object();
for (int i = 0; i < CONTROL_PORT_MAX; i++) {
node.add(control_ports[i].identifier.utf8().get_data(), control_ports[i].value);
}
return node;
}
Error AudioEffectStereoEnhancer::from_json(const JSON::Node &node) {
for (int i = 0; i < CONTROL_PORT_MAX; i++) {
std::string key = control_ports[i].identifier.utf8().get_data();
if (node.has(key)) {
control_ports[i].value = node.get(key).toFloat();
}
}
return OK;
}
void AudioEffectStereoEnhancer::_update_buffers() {
float ring_buffer_max_size = MAX_DELAY_MS + 8; //pad
ring_buffer_max_size /= 1000.0; //convert to seconds
ring_buffer_max_size *= sampling_rate;
int ringbuff_size = (int)ring_buffer_max_size;
int bits = 0;
while (ringbuff_size > 0) {
bits++;
ringbuff_size /= 2;
}
ringbuff_size = 1 << bits;
ringbuff_mask = ringbuff_size - 1;
ringbuff_pos = 0;
if (delay_ringbuff) {
delete[] delay_ringbuff;
}
delay_ringbuff = new float[ringbuff_size];
for (int i = 0; i < ringbuff_size; i++) {
delay_ringbuff[i] = 0;
}
}
AudioEffectStereoEnhancer::AudioEffectStereoEnhancer() {
control_ports[CONTROL_PORT_PAN_PULLOUT].name = "Pan Pullout";
control_ports[CONTROL_PORT_PAN_PULLOUT].identifier = "pan_pullout";
control_ports[CONTROL_PORT_PAN_PULLOUT].min = 0;
control_ports[CONTROL_PORT_PAN_PULLOUT].max = 4;
control_ports[CONTROL_PORT_PAN_PULLOUT].step = 0.01;
control_ports[CONTROL_PORT_PAN_PULLOUT].value = 1;
control_ports[CONTROL_PORT_TIME_PULLOUT].name = "Time Pullout";
control_ports[CONTROL_PORT_TIME_PULLOUT].identifier = "time_pullout";
control_ports[CONTROL_PORT_TIME_PULLOUT].min = 0;
control_ports[CONTROL_PORT_TIME_PULLOUT].max = MAX_DELAY_MS;
control_ports[CONTROL_PORT_TIME_PULLOUT].step = 0.1;
control_ports[CONTROL_PORT_TIME_PULLOUT].value = 0;
control_ports[CONTROL_PORT_SURROUND].name = "Surround";
control_ports[CONTROL_PORT_SURROUND].identifier = "surround";
control_ports[CONTROL_PORT_SURROUND].min = 0;
control_ports[CONTROL_PORT_SURROUND].max = 1;
control_ports[CONTROL_PORT_SURROUND].step = 0.01;
control_ports[CONTROL_PORT_SURROUND].value = 0;
delay_ringbuff = NULL;
block_size = 128;
sampling_rate = 0;
set_sampling_rate(44100);
set_process_block_size(128);
_update_buffers();
}
AudioEffectStereoEnhancer::~AudioEffectStereoEnhancer() {
if (delay_ringbuff) {
delete[] delay_ringbuff;
}
}
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