From 4a7fd91857a95dd9ba7c838384671b2a83e46e7d Mon Sep 17 00:00:00 2001
From: Chloe Marcec
Date: Thu, 11 Feb 2021 18:46:20 +1100
Subject: audren: Implement I3dl2Reverb

Most notable fix is the voices in Fire Emblem Three Houses
---
 src/audio_core/delay_line.cpp | 103 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/audio_core/delay_line.cpp

(limited to 'src/audio_core/delay_line.cpp')

diff --git a/src/audio_core/delay_line.cpp b/src/audio_core/delay_line.cpp
new file mode 100644
index 000000000..c8bc6e23e
--- /dev/null
+++ b/src/audio_core/delay_line.cpp
@@ -0,0 +1,103 @@
+#include "audio_core/delay_line.h"
+
+namespace AudioCore {
+DelayLineBase::DelayLineBase() = default;
+DelayLineBase::~DelayLineBase() = default;
+
+void DelayLineBase::Initialize(s32 _max_delay, float* src_buffer) {
+    buffer = src_buffer;
+    buffer_end = buffer + _max_delay;
+    max_delay = _max_delay;
+    output = buffer;
+    SetDelay(_max_delay);
+    Clear();
+}
+
+void DelayLineBase::SetDelay(s32 new_delay) {
+    if (max_delay < new_delay) {
+        return;
+    }
+    delay = new_delay;
+    input = (buffer + ((output - buffer) + new_delay) % (max_delay + 1));
+}
+
+s32 DelayLineBase::GetDelay() const {
+    return delay;
+}
+
+s32 DelayLineBase::GetMaxDelay() const {
+    return max_delay;
+}
+
+f32 DelayLineBase::TapOut(s32 last_sample) {
+    float* ptr = input - (last_sample + 1);
+    if (ptr < buffer) {
+        ptr += (max_delay + 1);
+    }
+
+    return *ptr;
+}
+
+f32 DelayLineBase::Tick(f32 sample) {
+    *(input++) = sample;
+    const auto out_sample = *(output++);
+
+    if (buffer_end < input) {
+        input = buffer;
+    }
+
+    if (buffer_end < output) {
+        output = buffer;
+    }
+
+    return out_sample;
+}
+
+float* DelayLineBase::GetInput() {
+    return input;
+}
+
+const float* DelayLineBase::GetInput() const {
+    return input;
+}
+
+f32 DelayLineBase::GetOutputSample() const {
+    return *output;
+}
+
+void DelayLineBase::Clear() {
+    std::memset(buffer, 0, sizeof(float) * max_delay);
+}
+
+void DelayLineBase::Reset() {
+    buffer = nullptr;
+    buffer_end = nullptr;
+    max_delay = 0;
+    input = nullptr;
+    output = nullptr;
+    delay = 0;
+}
+
+DelayLineAllPass::DelayLineAllPass() = default;
+DelayLineAllPass::~DelayLineAllPass() = default;
+
+void DelayLineAllPass::Initialize(u32 delay, float _coeffcient, f32* src_buffer) {
+    DelayLineBase::Initialize(delay, src_buffer);
+    SetCoefficient(_coeffcient);
+}
+
+void DelayLineAllPass::SetCoefficient(float _coeffcient) {
+    coefficient = _coeffcient;
+}
+
+f32 DelayLineAllPass::Tick(f32 sample) {
+    const auto temp = sample - coefficient * *output;
+    return coefficient * temp + DelayLineBase::Tick(temp);
+}
+
+void DelayLineAllPass::Reset() {
+    coefficient = 0.0f;
+    DelayLineBase::Reset();
+}
+
+} // namespace AudioCore
-- 
cgit v1.2.3


From d28b942458693b018cd8cab338537bdff5570118 Mon Sep 17 00:00:00 2001
From: Chloe Marcec
Date: Thu, 11 Feb 2021 19:17:50 +1100
Subject: address issues

---
 src/audio_core/delay_line.cpp | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

(limited to 'src/audio_core/delay_line.cpp')

diff --git a/src/audio_core/delay_line.cpp b/src/audio_core/delay_line.cpp
index c8bc6e23e..f4e4dd8d2 100644
--- a/src/audio_core/delay_line.cpp
+++ b/src/audio_core/delay_line.cpp
@@ -1,15 +1,16 @@
+#include <cstring>
 #include "audio_core/delay_line.h"
 
 namespace AudioCore {
 DelayLineBase::DelayLineBase() = default;
 DelayLineBase::~DelayLineBase() = default;
 
-void DelayLineBase::Initialize(s32 _max_delay, float* src_buffer) {
+void DelayLineBase::Initialize(s32 max_delay_, float* src_buffer) {
     buffer = src_buffer;
-    buffer_end = buffer + _max_delay;
-    max_delay = _max_delay;
+    buffer_end = buffer + max_delay_;
+    max_delay = max_delay_;
     output = buffer;
-    SetDelay(_max_delay);
+    SetDelay(max_delay_);
     Clear();
 }
 
@@ -30,7 +31,7 @@ s32 DelayLineBase::GetMaxDelay() const {
 }
 
 f32 DelayLineBase::TapOut(s32 last_sample) {
-    float* ptr = input - (last_sample + 1);
+    const float* ptr = input - (last_sample + 1);
     if (ptr < buffer) {
         ptr += (max_delay + 1);
     }
@@ -81,13 +82,13 @@ void DelayLineBase::Reset() {
 DelayLineAllPass::DelayLineAllPass() = default;
 DelayLineAllPass::~DelayLineAllPass() = default;
 
-void DelayLineAllPass::Initialize(u32 delay, float _coeffcient, f32* src_buffer) {
-    DelayLineBase::Initialize(delay, src_buffer);
-    SetCoefficient(_coeffcient);
+void DelayLineAllPass::Initialize(u32 delay_, float coeffcient_, f32* src_buffer) {
+    DelayLineBase::Initialize(delay_, src_buffer);
+    SetCoefficient(coeffcient_);
 }
 
-void DelayLineAllPass::SetCoefficient(float _coeffcient) {
-    coefficient = _coeffcient;
+void DelayLineAllPass::SetCoefficient(float coeffcient_) {
+    coefficient = coeffcient_;
 }
 
 f32 DelayLineAllPass::Tick(f32 sample) {
-- 
cgit v1.2.3