1 files changed, 102 insertions, 0 deletions
diff --git a/dom/media/CubebUtils.h b/dom/media/CubebUtils.h
new file mode 100644
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+++ b/dom/media/CubebUtils.h
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if !defined(CubebUtils_h_)
+#  define CubebUtils_h_
+
+#  include "cubeb/cubeb.h"
+
+#  include "AudioSampleFormat.h"
+#  include "nsString.h"
+
+class AudioDeviceInfo;
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(cubeb_stream_prefs)
+
+namespace mozilla {
+
+class CallbackThreadRegistry;
+
+namespace CubebUtils {
+
+typedef cubeb_devid AudioDeviceID;
+
+template <AudioSampleFormat N>
+struct ToCubebFormat {
+  static const cubeb_sample_format value = CUBEB_SAMPLE_FLOAT32NE;
+};
+
+template <>
+struct ToCubebFormat<AUDIO_FORMAT_S16> {
+  static const cubeb_sample_format value = CUBEB_SAMPLE_S16NE;
+};
+
+// Initialize Audio Library. Some Audio backends require initializing the
+// library before using it.
+void InitLibrary();
+
+// Shutdown Audio Library. Some Audio backends require shutting down the
+// library after using it.
+void ShutdownLibrary();
+
+bool SandboxEnabled();
+
+// Returns the maximum number of channels supported by the audio hardware.
+uint32_t MaxNumberOfChannels();
+
+// Get the sample rate the hardware/mixer runs at. Thread safe.
+uint32_t PreferredSampleRate(bool aShouldResistFingerprinting);
+
+// Initialize a cubeb stream. A pass through wrapper for cubeb_stream_init,
+// that can simulate streams that are very slow to start, by setting the pref
+// media.cubeb.slow_stream_init_ms.
+int CubebStreamInit(cubeb* context, cubeb_stream** stream,
+                    char const* stream_name, cubeb_devid input_device,
+                    cubeb_stream_params* input_stream_params,
+                    cubeb_devid output_device,
+                    cubeb_stream_params* output_stream_params,
+                    uint32_t latency_frames, cubeb_data_callback data_callback,
+                    cubeb_state_callback state_callback, void* user_ptr);
+
+enum Side { Input, Output };
+
+double GetVolumeScale();
+bool GetFirstStream();
+cubeb* GetCubebContext();
+void ReportCubebStreamInitFailure(bool aIsFirstStream);
+void ReportCubebBackendUsed();
+uint32_t GetCubebPlaybackLatencyInMilliseconds();
+uint32_t GetCubebMTGLatencyInFrames(cubeb_stream_params* params);
+bool CubebLatencyPrefSet();
+void GetCurrentBackend(nsAString& aBackend);
+cubeb_stream_prefs GetDefaultStreamPrefs(cubeb_device_type aType);
+char* GetForcedOutputDevice();
+// No-op on all platforms but Android, where it tells the device's AudioManager
+// to switch to "communication mode", which might change audio routing,
+// bluetooth communication type, etc.
+void SetInCommunication(bool aInCommunication);
+// Returns true if the output streams should be routed like a stream containing
+// voice data, and not generic audio. This can influence audio processing and
+// device selection.
+bool RouteOutputAsVoice();
+// Returns, in seconds, the roundtrip latency Gecko thinks there is between the
+// default input and output devices. This is for diagnosing purposes, the
+// latency figures are best used directly from the cubeb streams themselves, as
+// the devices being used matter. This is blocking.
+bool EstimatedRoundTripLatencyDefaultDevices(double* aMean, double* aStdDev);
+
+#  ifdef MOZ_WIDGET_ANDROID
+int32_t AndroidGetAudioOutputSampleRate();
+int32_t AndroidGetAudioOutputFramesPerBuffer();
+#  endif
+
+#  ifdef ENABLE_SET_CUBEB_BACKEND
+void ForceSetCubebContext(cubeb* aCubebContext);
+#  endif
+}  // namespace CubebUtils
+}  // namespace mozilla
+
+#endif  // CubebUtils_h_