[DirectSound] Fix buffer underrun for Bluetooth audio devices

3 files changed, 33 insertions, 2 deletions

diff --git a/xbmc/cores/AudioEngine/Sinks/AESinkDirectSound.cpp b/xbmc/cores/AudioEngine/Sinks/AESinkDirectSound.cpp
index 4b450ec5cb..4321679687 100644
--- a/xbmc/cores/AudioEngine/Sinks/AESinkDirectSound.cpp
+++ b/xbmc/cores/AudioEngine/Sinks/AESinkDirectSound.cpp
@@ -124,6 +124,7 @@ bool CAESinkDirectSound::Initialize(AEAudioFormat &format, std::string &device)
   if (m_initialized)
     return false;
 
+  bool deviceIsBluetooth = false;
   LPGUID deviceGUID = nullptr;
   RPC_WSTR wszUuid  = nullptr;
   HRESULT hr = E_FAIL;
@@ -152,6 +153,21 @@ bool CAESinkDirectSound::Initialize(AEAudioFormat &format, std::string &device)
     if (hr == RPC_S_OK) RpcStringFree(&wszUuid);
   }
 
+  // Detect a Bluetooth device
+  for (const auto& device : CAESinkFactoryWin::GetRendererDetails())
+  {
+    if (StringUtils::CompareNoCase(device.strDeviceId, strDeviceGUID) != 0)
+      continue;
+
+    if (device.strDeviceEnumerator == "BTHENUM")
+    {
+      deviceIsBluetooth = true;
+      CLog::LogF(LOGDEBUG, "Audio device '{}' is detected as Bluetooth device", deviceFriendlyName);
+    }
+
+    break;
+  }
+
   hr = DirectSoundCreate(deviceGUID, m_pDSound.ReleaseAndGetAddressOf(), nullptr);
 
   if (FAILED(hr))
@@ -218,10 +234,13 @@ bool CAESinkDirectSound::Initialize(AEAudioFormat &format, std::string &device)
 
   m_AvgBytesPerSec = wfxex.Format.nAvgBytesPerSec;
 
-  unsigned int uiFrameCount = (int)(format.m_sampleRate * 0.015); //default to 15ms chunks
+  const unsigned int chunkDurationMs = deviceIsBluetooth ? 50 : 20;
+  const unsigned int uiFrameCount = format.m_sampleRate * chunkDurationMs / 1000U;
   m_dwFrameSize = wfxex.Format.nBlockAlign;
   m_dwChunkSize = m_dwFrameSize * uiFrameCount;
-  m_dwBufferLen = m_dwChunkSize * 12; //180ms total buffer
+
+  // BT: 500ms total buffer (50 * 10); non-BT: 200ms total buffer (20 * 10)
+  m_dwBufferLen = m_dwChunkSize * 10;
 
   // fill in the secondary sound buffer descriptor
   DSBUFFERDESC dsbdesc = {};
diff --git a/xbmc/cores/AudioEngine/Sinks/windows/AESinkFactoryWin.h b/xbmc/cores/AudioEngine/Sinks/windows/AESinkFactoryWin.h
index dbe53f3203..61db03f5c4 100644
--- a/xbmc/cores/AudioEngine/Sinks/windows/AESinkFactoryWin.h
+++ b/xbmc/cores/AudioEngine/Sinks/windows/AESinkFactoryWin.h
@@ -178,6 +178,7 @@ struct RendererDetail
   std::string strDeviceId;
   std::string strDescription;
   std::string strWinDevType;
+  std::string strDeviceEnumerator;
   AEDeviceType eDeviceType;
   unsigned int nChannels;
   unsigned int uiChannelMask;
diff --git a/xbmc/cores/AudioEngine/Sinks/windows/AESinkFactoryWin32.cpp b/xbmc/cores/AudioEngine/Sinks/windows/AESinkFactoryWin32.cpp
index c728155c56..3b6abaae90 100644
--- a/xbmc/cores/AudioEngine/Sinks/windows/AESinkFactoryWin32.cpp
+++ b/xbmc/cores/AudioEngine/Sinks/windows/AESinkFactoryWin32.cpp
@@ -129,6 +129,17 @@ std::vector<RendererDetail> CAESinkFactoryWin::GetRendererDetails()
     details.uiChannelMask = std::max(varName.uintVal, (unsigned int)KSAUDIO_SPEAKER_STEREO);
     PropVariantClear(&varName);
 
+    hr = pProperty->GetValue(PKEY_Device_EnumeratorName, &varName);
+    if (FAILED(hr))
+    {
+      CLog::LogF(LOGERROR, "Retrieval of endpoint enumerator name failed.");
+      goto failed;
+    }
+
+    details.strDeviceEnumerator = KODI::PLATFORM::WINDOWS::FromW(varName.pwszVal);
+    StringUtils::ToUpper(details.strDeviceEnumerator);
+    PropVariantClear(&varName);
+
     if (pDevice->GetId(&pwszID) == S_OK)
     {
       if (wstrDDID.compare(pwszID) == 0)