Import initial work on Android frontend

android/app/src/cpp/android_audio_stream.cpp

@@ -0,0 +1,68 @@
+#include "android_audio_stream.h"
+#include "YBaseLib/Assert.h"
+#include "YBaseLib/Log.h"
+Log_SetChannel(AndroidAudioStream);
+
+AndroidAudioStream::AndroidAudioStream() = default;
+
+AndroidAudioStream::~AndroidAudioStream()
+{
+  if (m_is_open)
+    AndroidAudioStream::CloseDevice();
+}
+
+std::unique_ptr<AudioStream> AndroidAudioStream::Create()
+{
+  return std::make_unique<AndroidAudioStream>();
+}
+
+bool AndroidAudioStream::OpenDevice()
+{
+  DebugAssert(!m_is_open);
+#if 0
+  SDL_AudioSpec spec = {};
+  spec.freq = m_output_sample_rate;
+  spec.channels = static_cast<Uint8>(m_channels);
+  spec.format = AUDIO_S16;
+  spec.samples = static_cast<Uint16>(m_buffer_size);
+  spec.callback = AudioCallback;
+  spec.userdata = static_cast<void*>(this);
+
+  SDL_AudioSpec obtained = {};
+  if (SDL_OpenAudio(&spec, &obtained) < 0)
+  {
+    Log_ErrorPrintf("SDL_OpenAudio failed");
+    return false;
+  }
+#endif
+
+  m_is_open = true;
+  return true;
+}
+
+void AndroidAudioStream::PauseDevice(bool paused)
+{
+  // SDL_PauseAudio(paused ? 1 : 0);
+}
+
+void AndroidAudioStream::CloseDevice()
+{
+  DebugAssert(m_is_open);
+  // SDL_CloseAudio();
+  m_is_open = false;
+}
+
+#if 0
+void AndroidAudioStream::AudioCallback(void* userdata, uint8_t* stream, int len)
+{
+  AndroidAudioStream* const this_ptr = static_cast<AndroidAudioStream*>(userdata);
+  const u32 num_samples = len / sizeof(SampleType) / this_ptr->m_channels;
+  const u32 read_samples = this_ptr->ReadSamples(reinterpret_cast<SampleType*>(stream), num_samples);
+  const u32 silence_samples = num_samples - read_samples;
+  if (silence_samples > 0)
+  {
+    std::memset(reinterpret_cast<SampleType*>(stream) + (read_samples * this_ptr->m_channels), 0,
+                silence_samples * this_ptr->m_channels * sizeof(SampleType));
+  }
+}
+#endif