Rename AudioDriver to AudioSink

build/android/app/CMakeLists.txt

@@ -62,8 +62,8 @@ add_library(kaliber SHARED
     ../../../src/demo/sky_quad.cc
     ../../../src/engine/animatable.cc
     ../../../src/engine/animator.cc
-    ../../../src/engine/audio/audio_driver_oboe.cc
     ../../../src/engine/audio/audio_mixer.cc
+    ../../../src/engine/audio/audio_sink_oboe.cc
     ../../../src/engine/drawable.cc
     ../../../src/engine/engine.cc
     ../../../src/engine/font.cc

build/linux/Makefile

@@ -95,8 +95,8 @@ $(BASE_LIB): $(BASE_OBJS)
 ENGINE_SRC := \
   $(SRC_ROOT)/engine/animatable.cc \
   $(SRC_ROOT)/engine/animator.cc \
-  $(SRC_ROOT)/engine/audio/audio_driver_alsa.cc \
   $(SRC_ROOT)/engine/audio/audio_mixer.cc \
+  $(SRC_ROOT)/engine/audio/audio_sink_alsa.cc \
   $(SRC_ROOT)/engine/drawable.cc \
   $(SRC_ROOT)/engine/engine.cc \
   $(SRC_ROOT)/engine/font.cc \

src/engine/audio/audio_driver.h

@@ -1,27 +0,0 @@
-#ifndef ENGINE_AUDIO_AUDIO_DRIVER_H
-#define ENGINE_AUDIO_AUDIO_DRIVER_H
-
-namespace eng {
-
-// Models an audio sink sending mixed audio to the audio driver. Audio data from
-// the mixer source is delivered on a pull model using AudioDriverDelegate.
-class AudioDriver {
- public:
-  AudioDriver() = default;
-  virtual ~AudioDriver() = default;
-
-  virtual bool Initialize() = 0;
-
-  virtual void Suspend() = 0;
-  virtual void Resume() = 0;
-
-  virtual int GetHardwareSampleRate() = 0;
-
- private:
-  AudioDriver(const AudioDriver&) = delete;
-  AudioDriver& operator=(const AudioDriver&) = delete;
-};
-
-}  // namespace eng
-
-#endif  // ENGINE_AUDIO_AUDIO_DRIVER_H

src/engine/audio/audio_driver_delegate.h

@@ -1,20 +0,0 @@
-#ifndef ENGINE_AUDIO_AUDIO_DRIVER_DELEGATE_H
-#define ENGINE_AUDIO_AUDIO_DRIVER_DELEGATE_H
-
-#include <stddef.h>
-
-namespace eng {
-
-class AudioDriverDelegate {
- public:
-  AudioDriverDelegate() = default;
-  virtual ~AudioDriverDelegate() = default;
-
-  virtual int GetChannelCount() = 0;
-
-  virtual void RenderAudio(float* output_buffer, size_t num_frames) = 0;
-};
-
-}  // namespace eng
-
-#endif  // ENGINE_AUDIO_AUDIO_DRIVER_DELEGATE_H

src/engine/audio/audio_mixer.cc

@@ -8,9 +8,9 @@
 #include "engine/sound.h"
 
 #if defined(__ANDROID__)
-#include "engine/audio/audio_driver_oboe.h"
+#include "engine/audio/audio_sink_oboe.h"
 #elif defined(__linux__)
-#include "engine/audio/audio_driver_alsa.h"
+#include "engine/audio/audio_sink_alsa.h"
 #endif
 
 using namespace base;
@@ -20,12 +20,12 @@ namespace eng {
 AudioMixer::AudioMixer()
     : main_thread_task_runner_(TaskRunner::GetThreadLocalTaskRunner()),
 #if defined(__ANDROID__)
-      audio_driver_{std::make_unique<AudioDriverOboe>(this)} {
+      audio_sink_{std::make_unique<AudioSinkOboe>(this)} {
 #elif defined(__linux__)
-      audio_driver_{std::make_unique<AudioDriverAlsa>(this)} {
+      audio_sink_{std::make_unique<AudioSinkAlsa>(this)} {
 #endif
-  bool res = audio_driver_->Initialize();
-  CHECK(res) << "Failed to initialize audio driver.";
+  bool res = audio_sink_->Initialize();
+  CHECK(res) << "Failed to initialize audio sink.";
 }
 
 AudioMixer::~AudioMixer() = default;
@@ -154,15 +154,15 @@ void AudioMixer::SetEndCallback(uint64_t resource_id, base::Closure cb) {
 }
 
 void AudioMixer::Suspend() {
-  audio_driver_->Suspend();
+  audio_sink_->Suspend();
 }
 
 void AudioMixer::Resume() {
-  audio_driver_->Resume();
+  audio_sink_->Resume();
 }
 
 int AudioMixer::GetHardwareSampleRate() {
-  return audio_driver_->GetHardwareSampleRate();
+  return audio_sink_->GetHardwareSampleRate();
 }
 
 void AudioMixer::RenderAudio(float* output_buffer, size_t num_frames) {
@@ -264,7 +264,7 @@ void AudioMixer::RenderAudio(float* output_buffer, size_t num_frames) {
             ThreadPool::Get().PostTask(
                 HERE,
                 std::bind(&AudioMixer::DoStream, this, *it, flags & kLoop));
-          } else if (num_samples) {
+          } else {
             DLOG << "Mixer buffer underrun!";
           }
         }

src/engine/audio/audio_mixer.h

@@ -8,7 +8,7 @@
 #include <unordered_map>
 
 #include "base/closure.h"
-#include "engine/audio/audio_driver_delegate.h"
+#include "engine/audio/audio_sink_delegate.h"
 
 namespace base {
 class TaskRunner;
@@ -16,13 +16,13 @@ class TaskRunner;
 
 namespace eng {
 
-class AudioDriver;
+class AudioSink;
 class Sound;
 
-// Mix and render audio with low overhead. A platform specific AudioDriver
+// Mix and render audio with low overhead. A platform specific AudioSink
 // implementation is expected to periodically call RenderAudio() in a background
 // thread.
-class AudioMixer : public AudioDriverDelegate {
+class AudioMixer : public AudioSinkDelegate {
  public:
   AudioMixer();
   ~AudioMixer();
@@ -54,6 +54,7 @@ class AudioMixer : public AudioDriverDelegate {
   enum SampleFlags { kLoop = 1, kStopped = 2, kSimulateStereo = 4 };
   static constexpr int kChannelCount = 2;
 
+  // An audio resource that gets mixed and rendered to the audio sink.
   struct Resource {
     // Accessed by main thread only.
     bool active = false;
@@ -86,11 +87,11 @@ class AudioMixer : public AudioDriverDelegate {
 
   base::TaskRunner* main_thread_task_runner_;
 
-  std::unique_ptr<AudioDriver> audio_driver_;
+  std::unique_ptr<AudioSink> audio_sink_;
 
   bool audio_enabled_ = true;
 
-  // AudioDriverDelegate implementation
+  // AudioSinkDelegate implementation
   int GetChannelCount() final { return kChannelCount; }
   void RenderAudio(float* output_buffer, size_t num_frames) final;
 

src/engine/audio/audio_sink.h

@@ -0,0 +1,27 @@
+#ifndef ENGINE_AUDIO_AUDIO_SINK_H
+#define ENGINE_AUDIO_AUDIO_SINK_H
+
+namespace eng {
+
+// Models an audio sink sending mixed audio to the audio driver. Audio data from
+// the mixer source is delivered on a pull model using AudioSinkDelegate.
+class AudioSink {
+ public:
+  AudioSink() = default;
+  virtual ~AudioSink() = default;
+
+  virtual bool Initialize() = 0;
+
+  virtual void Suspend() = 0;
+  virtual void Resume() = 0;
+
+  virtual int GetHardwareSampleRate() = 0;
+
+ private:
+  AudioSink(const AudioSink&) = delete;
+  AudioSink& operator=(const AudioSink&) = delete;
+};
+
+}  // namespace eng
+
+#endif  // ENGINE_AUDIO_AUDIO_SINK_H

src/engine/audio/audio_sink_alsa.cc

@@ -1,20 +1,20 @@
-#include "engine/audio/audio_driver_alsa.h"
+#include "engine/audio/audio_sink_alsa.h"
 
 #include <memory>
 
 #include <alsa/asoundlib.h>
 
 #include "base/log.h"
-#include "engine/audio/audio_driver_delegate.h"
+#include "engine/audio/audio_sink_delegate.h"
 
 using namespace base;
 
 namespace eng {
 
-AudioDriverAlsa::AudioDriverAlsa(AudioDriverDelegate* delegate)
+AudioSinkAlsa::AudioSinkAlsa(AudioSinkDelegate* delegate)
     : delegate_(delegate) {}
 
-AudioDriverAlsa::~AudioDriverAlsa() {
+AudioSinkAlsa::~AudioSinkAlsa() {
   LOG << "Shutting down audio.";
 
   TerminateAudioThread();
@@ -22,7 +22,7 @@ AudioDriverAlsa::~AudioDriverAlsa() {
   snd_pcm_close(device_);
 }
 
-bool AudioDriverAlsa::Initialize() {
+bool AudioSinkAlsa::Initialize() {
   LOG << "Initializing audio.";
 
   int err;
@@ -144,28 +144,28 @@ bool AudioDriverAlsa::Initialize() {
   return false;
 }
 
-void AudioDriverAlsa::Suspend() {
+void AudioSinkAlsa::Suspend() {
   suspend_audio_thread_.store(true, std::memory_order_relaxed);
 }
 
-void AudioDriverAlsa::Resume() {
+void AudioSinkAlsa::Resume() {
   suspend_audio_thread_.store(false, std::memory_order_relaxed);
 }
 
-int AudioDriverAlsa::GetHardwareSampleRate() {
+int AudioSinkAlsa::GetHardwareSampleRate() {
   return sample_rate_;
 }
 
-void AudioDriverAlsa::StartAudioThread() {
+void AudioSinkAlsa::StartAudioThread() {
   DCHECK(!audio_thread_.joinable());
 
   LOG << "Starting audio thread.";
   terminate_audio_thread_.store(false, std::memory_order_relaxed);
   suspend_audio_thread_.store(false, std::memory_order_relaxed);
-  audio_thread_ = std::thread(&AudioDriverAlsa::AudioThreadMain, this);
+  audio_thread_ = std::thread(&AudioSinkAlsa::AudioThreadMain, this);
 }
 
-void AudioDriverAlsa::TerminateAudioThread() {
+void AudioSinkAlsa::TerminateAudioThread() {
   if (!audio_thread_.joinable())
     return;
 
@@ -175,7 +175,7 @@ void AudioDriverAlsa::TerminateAudioThread() {
   audio_thread_.join();
 }
 
-void AudioDriverAlsa::AudioThreadMain() {
+void AudioSinkAlsa::AudioThreadMain() {
   DCHECK(delegate_);
 
   size_t num_frames = period_size_ / (num_channels_ * sizeof(float));

src/engine/audio/audio_sink_alsa.h

@@ -1,21 +1,21 @@
-#ifndef ENGINE_AUDIO_AUDIO_DRIVER_ALSA_H
-#define ENGINE_AUDIO_AUDIO_DRIVER_ALSA_H
+#ifndef ENGINE_AUDIO_AUDIO_SINK_ALSA_H
+#define ENGINE_AUDIO_AUDIO_SINK_ALSA_H
 
 #include <atomic>
 #include <thread>
 
-#include "engine/audio/audio_driver.h"
+#include "engine/audio/audio_sink.h"
 
 typedef struct _snd_pcm snd_pcm_t;
 
 namespace eng {
 
-class AudioDriverDelegate;
+class AudioSinkDelegate;
 
-class AudioDriverAlsa final : public AudioDriver {
+class AudioSinkAlsa final : public AudioSink {
  public:
-  AudioDriverAlsa(AudioDriverDelegate* delegate);
-  ~AudioDriverAlsa() final;
+  AudioSinkAlsa(AudioSinkDelegate* delegate);
+  ~AudioSinkAlsa() final;
 
   bool Initialize() final;
 
@@ -36,7 +36,7 @@ class AudioDriverAlsa final : public AudioDriver {
   int sample_rate_ = 0;
   size_t period_size_ = 0;
 
-  AudioDriverDelegate* delegate_ = nullptr;
+  AudioSinkDelegate* delegate_ = nullptr;
 
   void StartAudioThread();
   void TerminateAudioThread();
@@ -46,4 +46,4 @@ class AudioDriverAlsa final : public AudioDriver {
 
 }  // namespace eng
 
-#endif  // ENGINE_AUDIO_AUDIO_DRIVER_ALSA_H
+#endif  // ENGINE_AUDIO_AUDIO_SINK_ALSA_H

src/engine/audio/audio_sink_delegate.h

@@ -0,0 +1,20 @@
+#ifndef ENGINE_AUDIO_AUDIO_SINK_DELEGATE_H
+#define ENGINE_AUDIO_AUDIO_SINK_DELEGATE_H
+
+#include <stddef.h>
+
+namespace eng {
+
+class AudioSinkDelegate {
+ public:
+  AudioSinkDelegate() = default;
+  virtual ~AudioSinkDelegate() = default;
+
+  virtual int GetChannelCount() = 0;
+
+  virtual void RenderAudio(float* output_buffer, size_t num_frames) = 0;
+};
+
+}  // namespace eng
+
+#endif  // ENGINE_AUDIO_AUDIO_SINK_DELEGATE_H

src/engine/audio/audio_sink_oboe.cc

@@ -1,61 +1,61 @@
-#include "engine/audio/audio_driver_oboe.h"
+#include "engine/audio/audio_sink_oboe.h"
 
 #include "base/log.h"
-#include "engine/audio/audio_driver_delegate.h"
+#include "engine/audio/audio_sink_delegate.h"
 #include "third_party/oboe/include/oboe/Oboe.h"
 
 using namespace base;
 
 namespace eng {
 
-AudioDriverOboe::AudioDriverOboe(AudioDriverDelegate* delegate)
+AudioSinkOboe::AudioSinkOboe(AudioSinkDelegate* delegate)
     : callback_(std::make_unique<StreamCallback>(this)), delegate_(delegate) {}
 
-AudioDriverOboe::~AudioDriverOboe() {
+AudioSinkOboe::~AudioSinkOboe() {
   LOG << "Shutting down audio.";
   stream_->stop();
 }
 
-bool AudioDriverOboe::Initialize() {
+bool AudioSinkOboe::Initialize() {
   LOG << "Initializing audio.";
   return RestartStream();
 }
 
-void AudioDriverOboe::Suspend() {
+void AudioSinkOboe::Suspend() {
   stream_->pause();
 }
 
-void AudioDriverOboe::Resume() {
+void AudioSinkOboe::Resume() {
   stream_->start();
 }
 
-int AudioDriverOboe::GetHardwareSampleRate() {
+int AudioSinkOboe::GetHardwareSampleRate() {
   return stream_->getSampleRate();
 }
 
-AudioDriverOboe::StreamCallback::StreamCallback(AudioDriverOboe* driver)
-    : driver_(driver) {}
+AudioSinkOboe::StreamCallback::StreamCallback(AudioSinkOboe* audio_sink)
+    : audio_sink_(audio_sink) {}
 
-AudioDriverOboe::StreamCallback::~StreamCallback() = default;
+AudioSinkOboe::StreamCallback::~StreamCallback() = default;
 
-oboe::DataCallbackResult AudioDriverOboe::StreamCallback::onAudioReady(
+oboe::DataCallbackResult AudioSinkOboe::StreamCallback::onAudioReady(
     oboe::AudioStream* oboe_stream,
     void* audio_data,
     int32_t num_frames) {
   float* output_buffer = static_cast<float*>(audio_data);
-  driver_->delegate_->RenderAudio(output_buffer, num_frames);
+  audio_sink_->delegate_->RenderAudio(output_buffer, num_frames);
   return oboe::DataCallbackResult::Continue;
 }
 
-void AudioDriverOboe::StreamCallback::onErrorAfterClose(
+void AudioSinkOboe::StreamCallback::onErrorAfterClose(
     oboe::AudioStream* oboe_stream,
     oboe::Result error) {
   LOG << "Error after close. Error: " << oboe::convertToText(error);
 
-  driver_->RestartStream();
+  audio_sink_->RestartStream();
 }
 
-bool AudioDriverOboe::RestartStream() {
+bool AudioSinkOboe::RestartStream() {
   oboe::AudioStreamBuilder builder;
   oboe::Result result =
       builder.setSharingMode(oboe::SharingMode::Exclusive)

src/engine/audio/audio_sink_oboe.h

@@ -1,21 +1,21 @@
-#ifndef ENGINE_AUDIO_AUDIO_DRIVER_OBOE_H
-#define ENGINE_AUDIO_AUDIO_DRIVER_OBOE_H
+#ifndef ENGINE_AUDIO_AUDIO_SINK_OBOE_H
+#define ENGINE_AUDIO_AUDIO_SINK_OBOE_H
 
 #include <memory>
 
 #include "third_party/oboe/include/oboe/AudioStream.h"
 #include "third_party/oboe/include/oboe/AudioStreamCallback.h"
 
-#include "engine/audio/audio_driver.h"
+#include "engine/audio/audio_sink.h"
 
 namespace eng {
 
-class AudioDriverDelegate;
+class AudioSinkDelegate;
 
-class AudioDriverOboe final : public AudioDriver {
+class AudioSinkOboe final : public AudioSink {
  public:
-  AudioDriverOboe(AudioDriverDelegate* delegate);
-  ~AudioDriverOboe() final;
+  AudioSinkOboe(AudioSinkDelegate* delegate);
+  ~AudioSinkOboe() final;
 
   bool Initialize() final;
 
@@ -27,7 +27,7 @@ class AudioDriverOboe final : public AudioDriver {
  private:
   class StreamCallback final : public oboe::AudioStreamCallback {
    public:
-    StreamCallback(AudioDriverOboe* audio);
+    StreamCallback(AudioSinkOboe* audio);
     ~StreamCallback() final;
 
     oboe::DataCallbackResult onAudioReady(oboe::AudioStream* oboe_stream,
@@ -38,17 +38,17 @@ class AudioDriverOboe final : public AudioDriver {
                            oboe::Result error) final;
 
    private:
-    AudioDriverOboe* driver_;
+    AudioSinkOboe* audio_sink_;
   };
 
   oboe::ManagedStream stream_;
   std::unique_ptr<StreamCallback> callback_;
 
-  AudioDriverDelegate* delegate_ = nullptr;
+  AudioSinkDelegate* delegate_ = nullptr;
 
   bool RestartStream();
 };
 
 }  // namespace eng
 
-#endif  // ENGINE_AUDIO_AUDIO_DRIVER_OBOE_H
+#endif  // ENGINE_AUDIO_AUDIO_SINK_OBOE_H