devctxt.h
资源名称:SMDK2440.rar [点击查看]
上传用户:qiulin1960
上传日期:2013-10-16
资源大小:2844k
文件大小:3k
源码类别:
Windows CE
开发平台:
Windows_Unix
- #pragma once
- // -----------------------------------------------------------------------------
- //
- // THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
- // ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
- // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
- // PARTICULAR PURPOSE.
- // Copyright (c) 1995-2000 Microsoft Corporation. All rights reserved.
- //
- // -----------------------------------------------------------------------------
- #define SECONDARYGAINCLASSMAX 4
- // number of classes affected by the device gain
- #define SECONDARYDEVICEGAINCLASSMAX 2
- class DeviceContext
- {
- public:
- DeviceContext()
- {
- InitializeListHead(&m_StreamList);
- m_dwGain = 0xFFFF;
- m_dwDefaultStreamGain = 0xFFFF;
- for (int i=0;i<SECONDARYGAINCLASSMAX;i++)
- {
- m_dwSecondaryGainLimit[i]=0xFFFF;
- }
- }
- virtual BOOL IsSupportedFormat(LPWAVEFORMATEX lpFormat);
- PBYTE TransferBuffer(PBYTE pBuffer, PBYTE pBufferEnd, DWORD *pNumStreams);
- void NewStream(StreamContext *pStreamContext);
- void DeleteStream(StreamContext *pStreamContext);
- DWORD GetGain()
- {
- return m_dwGain;
- }
- DWORD SetGain(DWORD dwGain)
- {
- m_dwGain = dwGain;
- RecalcAllGains();
- return MMSYSERR_NOERROR;
- }
- DWORD GetDefaultStreamGain()
- {
- return m_dwDefaultStreamGain;
- }
- DWORD SetDefaultStreamGain(DWORD dwGain)
- {
- m_dwDefaultStreamGain = dwGain;
- return MMSYSERR_NOERROR;
- }
- DWORD GetSecondaryGainLimit(DWORD GainClass)
- {
- return m_dwSecondaryGainLimit[GainClass];
- }
- DWORD SetSecondaryGainLimit(DWORD GainClass, DWORD Limit)
- {
- if (GainClass>=SECONDARYGAINCLASSMAX)
- {
- return MMSYSERR_ERROR;
- }
- m_dwSecondaryGainLimit[GainClass]=Limit;
- RecalcAllGains();
- return MMSYSERR_NOERROR;
- }
- void RecalcAllGains();
- DWORD OpenStream(LPWAVEOPENDESC lpWOD, DWORD dwFlags, StreamContext **ppStreamContext);
- virtual DWORD GetExtDevCaps(PVOID pCaps, DWORD dwSize)=0;
- virtual DWORD GetDevCaps(PVOID pCaps, DWORD dwSize)=0;
- virtual void StreamReadyToRender(StreamContext *pStreamContext)=0;
- virtual StreamContext *CreateStream(LPWAVEOPENDESC lpWOD)=0;
- protected:
- LIST_ENTRY m_StreamList; // List of streams rendering to/from this device
- DWORD m_dwGain;
- DWORD m_dwDefaultStreamGain;
- DWORD m_dwSecondaryGainLimit[SECONDARYGAINCLASSMAX];
- };
- class InputDeviceContext : public DeviceContext
- {
- public:
- StreamContext *CreateStream(LPWAVEOPENDESC lpWOD);
- DWORD GetExtDevCaps(PVOID pCaps, DWORD dwSize);
- DWORD GetDevCaps(PVOID pCaps, DWORD dwSize);
- void StreamReadyToRender(StreamContext *pStreamContext);
- };
- class OutputDeviceContext : public DeviceContext
- {
- public:
- BOOL IsSupportedFormat(LPWAVEFORMATEX lpFormat);
- StreamContext *CreateStream(LPWAVEOPENDESC lpWOD);
- DWORD GetExtDevCaps(PVOID pCaps, DWORD dwSize);
- DWORD GetDevCaps(PVOID pCaps, DWORD dwSize);
- void StreamReadyToRender(StreamContext *pStreamContext);
- };