From 485e9adfce01b9b4e21dae927fb3b7ed3d5fc83d Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Fri, 25 Aug 2023 15:58:54 +1000
Subject: Performance tweaks for smoother tunes

 - Pin the decoder task to APP_CORE to reduce context switches
 - Increase sample buffer sizes
---
 src/audio/audio_converter.cpp  | 2 +-
 src/audio/audio_decoder.cpp    | 4 ++--
 src/audio/i2s_audio_output.cpp | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

(limited to 'src/audio')

diff --git a/src/audio/audio_converter.cpp b/src/audio/audio_converter.cpp
index c540d821..60d83648 100644
--- a/src/audio/audio_converter.cpp
+++ b/src/audio/audio_converter.cpp
@@ -24,7 +24,7 @@
 static constexpr char kTag[] = "mixer";
 
 static constexpr std::size_t kSourceBufferLength = 8 * 1024;
-static constexpr std::size_t kSampleBufferLength = 240 * 2;
+static constexpr std::size_t kSampleBufferLength = 240 * 2 * 4;
 
 namespace audio {
 
diff --git a/src/audio/audio_decoder.cpp b/src/audio/audio_decoder.cpp
index 03f81124..f9f76387 100644
--- a/src/audio/audio_decoder.cpp
+++ b/src/audio/audio_decoder.cpp
@@ -46,7 +46,7 @@ namespace audio {
 
 static const char* kTag = "audio_dec";
 
-static constexpr std::size_t kCodecBufferLength = 240 * 4;
+static constexpr std::size_t kCodecBufferLength = 240 * 4 * 4;
 
 Timer::Timer(const codecs::ICodec::OutputFormat& format)
     : current_seconds_(0),
@@ -79,7 +79,7 @@ auto Timer::AddSamples(std::size_t samples) -> void {
 auto Decoder::Start(std::shared_ptr<IAudioSource> source,
                     std::shared_ptr<SampleConverter> sink) -> Decoder* {
   Decoder* task = new Decoder(source, sink);
-  tasks::StartPersistent<tasks::Type::kAudio>([=]() { task->Main(); });
+  tasks::StartPersistent<tasks::Type::kAudio>(1, [=]() { task->Main(); });
   return task;
 }
 
diff --git a/src/audio/i2s_audio_output.cpp b/src/audio/i2s_audio_output.cpp
index 9e18597a..359cd4c6 100644
--- a/src/audio/i2s_audio_output.cpp
+++ b/src/audio/i2s_audio_output.cpp
@@ -37,7 +37,7 @@ static constexpr uint16_t kMaxVolume = 0x1ff;
 static constexpr uint16_t kMinVolume = 0b0;
 static constexpr uint16_t kMaxVolumeBeforeClipping = 0x185;
 static constexpr uint16_t kLineLevelVolume = 0x13d;
-static constexpr uint16_t kDefaultVolume = 0x128;
+static constexpr uint16_t kDefaultVolume = 0x100;
 
 static constexpr size_t kDrainBufferSize = 8 * 1024;
 
-- 
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