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73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#if !defined(CubebUtils_h_)
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#define CubebUtils_h_
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#include "cubeb/cubeb.h"
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#include "nsAutoRef.h"
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#include "mozilla/StaticMutex.h"
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#include "mozilla/dom/AudioChannelBinding.h"
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template <>
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class nsAutoRefTraits<cubeb_stream> : public nsPointerRefTraits<cubeb_stream>
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{
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public:
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static void Release(cubeb_stream* aStream) { cubeb_stream_destroy(aStream); }
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};
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namespace mozilla {
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class CubebUtils {
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public:
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// Initialize Audio Library. Some Audio backends require initializing the
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// library before using it.
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static void InitLibrary();
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// Shutdown Audio Library. Some Audio backends require shutting down the
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// library after using it.
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static void ShutdownLibrary();
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// Returns the maximum number of channels supported by the audio hardware.
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static int MaxNumberOfChannels();
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// Queries the samplerate the hardware/mixer runs at, and stores it.
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// Can be called on any thread. When this returns, it is safe to call
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// PreferredSampleRate without locking.
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static void InitPreferredSampleRate();
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// Get the aformentionned sample rate. Does not lock.
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static int PreferredSampleRate();
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static void PrefChanged(const char* aPref, void* aClosure);
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static double GetVolumeScale();
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static bool GetFirstStream();
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static cubeb* GetCubebContext();
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static cubeb* GetCubebContextUnlocked();
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static uint32_t GetCubebLatency();
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static bool CubebLatencyPrefSet();
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#if defined(__ANDROID__) && defined(MOZ_B2G)
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static cubeb_stream_type ConvertChannelToCubebType(dom::AudioChannel aChannel);
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#endif
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private:
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// This mutex protects the static members below.
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static StaticMutex sMutex;
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static cubeb* sCubebContext;
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// Prefered samplerate, in Hz (characteristic of the
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// hardware/mixer/platform/API used).
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static uint32_t sPreferredSampleRate;
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static double sVolumeScale;
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static uint32_t sCubebLatency;
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static bool sCubebLatencyPrefSet;
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};
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}
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#endif // CubebUtils_h_
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