122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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// PARTICULAR PURPOSE.
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//
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// Copyright (c) Microsoft Corporation. All rights reserved
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//
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#pragma once
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#include <MMDeviceAPI.h>
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#include <AudioClient.h>
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#include <AudioPolicy.h>
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struct RenderBuffer
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{
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RenderBuffer * _Next;
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UINT32 _BufferLength;
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BYTE * _Buffer;
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RenderBuffer() :
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_Next(NULL),
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_BufferLength(0),
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_Buffer(NULL)
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{
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}
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~RenderBuffer()
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{
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delete [] _Buffer;
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}
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};
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class CWASAPIRenderer : IMMNotificationClient, IAudioSessionEvents
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{
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public:
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// Public interface to CWASAPIRenderer.
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enum RenderSampleType
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{
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SampleTypeFloat,
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SampleType16BitPCM,
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};
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CWASAPIRenderer(IMMDevice *Endpoint, bool EnableStreamSwitch, ERole EndpointRole);
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bool Initialize(UINT32 EngineLatency);
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void Shutdown();
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bool Start(RenderBuffer *RenderBufferQueue);
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void Stop();
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WORD ChannelCount() { return _MixFormat->nChannels; }
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UINT32 SamplesPerSecond() { return _MixFormat->nSamplesPerSec; }
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UINT32 BytesPerSample() { return _MixFormat->wBitsPerSample / 8; }
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RenderSampleType SampleType() { return _RenderSampleType; }
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UINT32 FrameSize() { return _FrameSize; }
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UINT32 BufferSize() { return _BufferSize; }
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UINT32 BufferSizePerPeriod();
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STDMETHOD_(ULONG, AddRef)();
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STDMETHOD_(ULONG, Release)();
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private:
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~CWASAPIRenderer(void);
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LONG _RefCount;
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//
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// Core Audio Rendering member variables.
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//
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IMMDevice * _Endpoint;
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IAudioClient *_AudioClient;
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IAudioRenderClient *_RenderClient;
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HANDLE _RenderThread;
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HANDLE _ShutdownEvent;
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WAVEFORMATEX *_MixFormat;
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UINT32 _FrameSize;
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RenderSampleType _RenderSampleType;
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UINT32 _BufferSize;
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LONG _EngineLatencyInMS;
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//
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// Render buffer management.
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//
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RenderBuffer *_RenderBufferQueue;
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static DWORD __stdcall WASAPIRenderThread(LPVOID Context);
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DWORD CWASAPIRenderer::DoRenderThread();
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//
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// Stream switch related members and methods.
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//
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bool _EnableStreamSwitch;
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ERole _EndpointRole;
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HANDLE _StreamSwitchEvent; // Set when the current session is disconnected or the default device changes.
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HANDLE _StreamSwitchCompleteEvent; // Set when the default device changed.
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IAudioSessionControl * _AudioSessionControl;
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IMMDeviceEnumerator * _DeviceEnumerator;
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bool _InStreamSwitch;
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bool InitializeStreamSwitch();
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void TerminateStreamSwitch();
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bool HandleStreamSwitchEvent();
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STDMETHOD(OnDisplayNameChanged) (LPCWSTR /*NewDisplayName*/, LPCGUID /*EventContext*/) { return S_OK; };
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STDMETHOD(OnIconPathChanged) (LPCWSTR /*NewIconPath*/, LPCGUID /*EventContext*/) { return S_OK; };
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STDMETHOD(OnSimpleVolumeChanged) (float /*NewSimpleVolume*/, BOOL /*NewMute*/, LPCGUID /*EventContext*/) { return S_OK; }
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STDMETHOD(OnChannelVolumeChanged) (DWORD /*ChannelCount*/, float /*NewChannelVolumes*/[], DWORD /*ChangedChannel*/, LPCGUID /*EventContext*/) { return S_OK; };
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STDMETHOD(OnGroupingParamChanged) (LPCGUID /*NewGroupingParam*/, LPCGUID /*EventContext*/) {return S_OK; };
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STDMETHOD(OnStateChanged) (AudioSessionState /*NewState*/) { return S_OK; };
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STDMETHOD(OnSessionDisconnected) (AudioSessionDisconnectReason DisconnectReason);
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STDMETHOD(OnDeviceStateChanged) (LPCWSTR /*DeviceId*/, DWORD /*NewState*/) { return S_OK; }
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STDMETHOD(OnDeviceAdded) (LPCWSTR /*DeviceId*/) { return S_OK; };
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STDMETHOD(OnDeviceRemoved) (LPCWSTR /*DeviceId(*/) { return S_OK; };
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STDMETHOD(OnDefaultDeviceChanged) (EDataFlow Flow, ERole Role, LPCWSTR NewDefaultDeviceId);
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STDMETHOD(OnPropertyValueChanged) (LPCWSTR /*DeviceId*/, const PROPERTYKEY /*Key*/){return S_OK; };
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//
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// IUnknown
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//
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STDMETHOD(QueryInterface)(REFIID iid, void **pvObject);
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//
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// Utility functions.
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//
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bool CalculateMixFormatType();
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bool InitializeAudioEngine();
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bool LoadFormat();
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};
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