82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
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/*++
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Copyright (c) 1995-1996 Microsoft Corporation
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Module Name:
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audpackt.h
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Abstract:
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Contains prototypes for the AudioPacket class, which encapsulates a sound buffer in
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its various states: recorded/encoded/network/decoded/playing etc.
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--*/
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#ifndef _AUDPACKT_H_
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#define _AUDPACKT_H_
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#include <pshpack8.h> /* Assume 8 byte packing throughout */
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#define AP_NUM_PREAMBLE_PACKETS 6
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//
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// Start of Interpolation defines
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//
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// Recovering techniques
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typedef enum tagTECHNIQUE
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{
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techPATT_MATCH_PREV_SIGN_CC, // Replicate from the previous frame using pattern matching and signed cross-correlation
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techPATT_MATCH_NEXT_SIGN_CC, // Replicate from the previous frame using pattern matching and signed cross-correlation
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techPATT_MATCH_BOTH_SIGN_CC, // Interpolate between the previous and the next frame using pattern matching and signed cross-correlation
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techDUPLICATE_PREV, // Replicate last frame
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techDUPLICATE_NEXT // Replicate next frame
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}TECHNIQUE;
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// Wave Substitution structure
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typedef struct tagPCMSUB
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{
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short *pwWaSuBf; // Pointer to missing buffer
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short *pwPrBf; // Pointer to previous audio buffer
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short *pwNeBf; // Pointer to next audio buffer
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DWORD dwBfSize; // Number of samples in audio buffer
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DWORD dwSaPeSe; // Frequency sampling for ALL buffers (in samples per second)
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DWORD dwBiPeSa; // Number of bits per sample for ALL buffers (in bits per sample)
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TECHNIQUE eTech; // Technique to be used
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BOOL fScal; // Scale reconstructed frame
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}PCMSUB;
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#define PATTERN_SIZE 4 // Pattern size in milliseconds. Experiment with values between 2 and 8 ms.
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#define SEARCH_SIZE 8 // Window search size in milliseconds. Experiment with values between 8 and 16 ms.
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//
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// End of Interpolation defines
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//
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class AudioPacket : public MediaPacket
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{
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public:
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virtual HRESULT Initialize ( MEDIAPACKETINIT * p );
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virtual HRESULT Play ( MMIODEST *pmmioDest, UINT uDataType );
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virtual HRESULT Record ( void );
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virtual HRESULT Interpolate ( MediaPacket * pPrev, MediaPacket * pNext);
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virtual HRESULT GetSignalStrength ( PDWORD pdwMaxStrength );
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HRESULT ComputePower ( PDWORD pdwVoiceStrength, PWORD pwPeakStrength);
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virtual HRESULT MakeSilence ( void );
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virtual HRESULT Open ( UINT uType, DPHANDLE hdl ); // called by RxStream or TxStream
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virtual HRESULT Close ( UINT uType ); // called by RxStream or TxStream
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virtual BOOL IsBufferDone ( void );
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virtual BOOL IsSameMediaFormat(PVOID fmt1,PVOID fmt2);
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virtual DWORD GetDevDataSamples();
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void WriteToFile (MMIODEST *pmmioDest);
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void ReadFromFile (MMIOSRC *pmmioSrc);
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HRESULT PCMSubstitute( PCMSUB *pPCMSub);
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};
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#include <poppack.h> /* End byte packing */
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#endif
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