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120 lines
2.8 KiB
120 lines
2.8 KiB
//==========================================================================;
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// Copyright (c) 1993-1996 Microsoft Corporation
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//
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//--------------------------------------------------------------------------;
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//
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// g711.h
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//
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// Description:
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// This file contains prototypes for the filtering routines.
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//
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//
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//==========================================================================;
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#ifndef _INC_G711
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#define _INC_G711 // #defined if g711.h has been included
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#ifndef RC_INVOKED
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#pragma pack(1) // assume byte packing throughout
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#endif
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#ifndef EXTERN_C
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#ifdef __cplusplus
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#define EXTERN_C extern "C"
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#else
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#define EXTERN_C extern
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#endif
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#endif
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#ifdef __cplusplus
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extern "C" // assume C declarations for C++
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{
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#endif
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//
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//
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//
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#define G711_MAX_CHANNELS 2
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#define G711_BITS_PER_SAMPLE 8
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#define G711_WFX_EXTRA_BYTES 0
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//
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// macros to compute block alignment and convert between samples and bytes
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// of G711 data. note that these macros assume:
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//
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// wBitsPerSample = 8
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// nChannels = 1 or 2
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//
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// the pwfx argument is a pointer to a WAVEFORMATEX structure.
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//
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#define G711_BLOCKALIGNMENT(pwfx) (UINT)(pwfx->nChannels)
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#define G711_AVGBYTESPERSEC(pwfx) (DWORD)((pwfx)->nSamplesPerSec * (pwfx)->nChannels)
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#define G711_BYTESTOSAMPLES(pwfx, dw) (DWORD)(dw / G711_BLOCKALIGNMENT(pwfx))
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#define G711_SAMPLESTOBYTES(pwfx, dw) (DWORD)(dw * G711_BLOCKALIGNMENT(pwfx))
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//
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// function prototypes from G711.C
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//
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//
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LRESULT FNGLOBAL AlawToPcm
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(
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LPACMDRVSTREAMINSTANCE padsi,
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LPACMDRVSTREAMHEADER padsh
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);
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LRESULT FNGLOBAL PcmToAlaw
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(
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LPACMDRVSTREAMINSTANCE padsi,
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LPACMDRVSTREAMHEADER padsh
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);
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LRESULT FNGLOBAL UlawToPcm
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(
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LPACMDRVSTREAMINSTANCE padsi,
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LPACMDRVSTREAMHEADER padsh
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);
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LRESULT FNGLOBAL PcmToUlaw
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(
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LPACMDRVSTREAMINSTANCE padsi,
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LPACMDRVSTREAMHEADER padsh
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);
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LRESULT FNGLOBAL AlawToUlaw
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(
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LPACMDRVSTREAMINSTANCE padsi,
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LPACMDRVSTREAMHEADER padsh
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);
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LRESULT FNGLOBAL UlawToAlaw
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(
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LPACMDRVSTREAMINSTANCE padsi,
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LPACMDRVSTREAMHEADER padsh
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);
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//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ;
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//
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//
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//
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//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ;
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#ifndef RC_INVOKED
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#pragma pack() // revert to default packing
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#endif
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#ifdef __cplusplus
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} // end of extern "C" {
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#endif
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#endif // _INC_G711
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