From d6b83fcf4a1a3039c06e0b1d1a1f7e2af2351efb Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Tue, 15 Aug 2023 13:53:30 +1000
Subject: Flesh out basic bluetooth support

No ui yet, and performance isn't great. It kinda works though!!
---
 src/audio/include/audio_fsm.hpp       |  3 +++
 src/audio/include/audio_sink.hpp      |  8 ++----
 src/audio/include/bt_audio_output.hpp | 49 +++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+), 6 deletions(-)
 create mode 100644 src/audio/include/bt_audio_output.hpp

(limited to 'src/audio/include')

diff --git a/src/audio/include/audio_fsm.hpp b/src/audio/include/audio_fsm.hpp
index d10f31e1..5d44fcda 100644
--- a/src/audio/include/audio_fsm.hpp
+++ b/src/audio/include/audio_fsm.hpp
@@ -12,6 +12,7 @@
 
 #include "audio_events.hpp"
 #include "audio_task.hpp"
+#include "bt_audio_output.hpp"
 #include "database.hpp"
 #include "display.hpp"
 #include "fatfs_audio_input.hpp"
@@ -33,6 +34,7 @@ class AudioState : public tinyfsm::Fsm<AudioState> {
   static auto Init(drivers::IGpios* gpio_expander,
                    std::weak_ptr<database::Database>,
                    std::shared_ptr<database::ITagParser>,
+                   drivers::Bluetooth* bluetooth,
                    TrackQueue* queue) -> bool;
 
   virtual ~AudioState() {}
@@ -68,6 +70,7 @@ class AudioState : public tinyfsm::Fsm<AudioState> {
   static std::unique_ptr<AudioTask> sTask;
   static std::unique_ptr<FatfsAudioInput> sFileSource;
   static std::unique_ptr<I2SAudioOutput> sI2SOutput;
+  static std::unique_ptr<BluetoothAudioOutput> sBtOutput;
 
   static TrackQueue* sTrackQueue;
   static std::optional<database::TrackId> sCurrentTrack;
diff --git a/src/audio/include/audio_sink.hpp b/src/audio/include/audio_sink.hpp
index 2fb4bf63..b5d6ef57 100644
--- a/src/audio/include/audio_sink.hpp
+++ b/src/audio/include/audio_sink.hpp
@@ -18,15 +18,11 @@ namespace audio {
 
 class IAudioSink {
  private:
-  static const std::size_t kDrainBufferSize = 24 * 1024;
   StreamBufferHandle_t stream_;
 
  public:
-  IAudioSink()
-      : stream_(xStreamBufferCreateWithCaps(
-            kDrainBufferSize,
-            1,
-            MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT)) {}
+  IAudioSink(size_t buffer_size, uint32_t caps)
+      : stream_(xStreamBufferCreateWithCaps(buffer_size, 1, caps)) {}
 
   virtual ~IAudioSink() { vStreamBufferDeleteWithCaps(stream_); }
 
diff --git a/src/audio/include/bt_audio_output.hpp b/src/audio/include/bt_audio_output.hpp
new file mode 100644
index 00000000..e11a5d44
--- /dev/null
+++ b/src/audio/include/bt_audio_output.hpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <sys/_stdint.h>
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+#include "audio_element.hpp"
+#include "audio_sink.hpp"
+#include "bluetooth.hpp"
+#include "chunk.hpp"
+#include "result.hpp"
+
+#include "gpios.hpp"
+#include "i2s_dac.hpp"
+#include "stream_info.hpp"
+
+namespace audio {
+
+class BluetoothAudioOutput : public IAudioSink {
+ public:
+  BluetoothAudioOutput(drivers::Bluetooth* bt);
+  ~BluetoothAudioOutput();
+
+  auto SetInUse(bool) -> void override;
+
+  auto SetVolumeImbalance(int_fast8_t balance) -> void override;
+  auto SetVolume(uint_fast8_t percent) -> void override;
+  auto GetVolume() -> uint_fast8_t override;
+  auto AdjustVolumeUp() -> bool override;
+  auto AdjustVolumeDown() -> bool override;
+
+  auto PrepareFormat(const Format&) -> Format override;
+  auto Configure(const Format& format) -> void override;
+
+  BluetoothAudioOutput(const BluetoothAudioOutput&) = delete;
+  BluetoothAudioOutput& operator=(const BluetoothAudioOutput&) = delete;
+
+ private:
+  drivers::Bluetooth* bluetooth_;
+};
+
+}  // namespace audio
-- 
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