81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
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/*++
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Copyright (c) 2002 Microsoft Corporation
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Module Name:
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CorrectACMStreamOpen.cpp
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Abstract:
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This shim corrects the samples per block for acmStreamOpen so that
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it will pass IMA ADPCM's parameter validation.
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Notes:
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This is a general shim.
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History:
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08/09/2002 mnikkel Created
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--*/
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#include "precomp.h"
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#include "msacmdrv.h"
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typedef MMRESULT (*_pfn_acmStreamOpen)(LPHACMSTREAM phas, HACMDRIVER had, LPWAVEFORMATEX pwfxSrc,
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LPWAVEFORMATEX pwfxDst, LPWAVEFILTER pwfltr, DWORD_PTR dwCallback,
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DWORD_PTR dwInstance, DWORD fdwOpen );
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IMPLEMENT_SHIM_BEGIN(CorrectACMStreamOpen)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(acmStreamOpen)
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APIHOOK_ENUM_END
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/*++
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If the wSamplesPerBlock is 1017 samples change it to 505 samples
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so it will pass IMA ADPCM's parameter validation.
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--*/
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MMRESULT
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APIHOOK(acmStreamOpen)(
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LPHACMSTREAM phas,
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HACMDRIVER had,
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LPWAVEFORMATEX pwfxSrc,
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LPWAVEFORMATEX pwfxDst,
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LPWAVEFILTER pwfltr,
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DWORD_PTR dwCallback,
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DWORD_PTR dwInstance,
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DWORD fdwOpen
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)
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{
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if ( pwfxSrc &&
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(WAVE_FORMAT_IMA_ADPCM == pwfxSrc->wFormatTag) &&
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(256 == pwfxSrc->nBlockAlign) &&
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(1017 == ((LPIMAADPCMWAVEFORMAT)(pwfxSrc))->wSamplesPerBlock))
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{
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((LPIMAADPCMWAVEFORMAT)(pwfxSrc))->wSamplesPerBlock = 505;
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DPFN( eDbgLevelError, "[acmStreamOpen] changing samples per block to 505");
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}
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return acmStreamOpen( phas, had, pwfxSrc, pwfxDst, pwfltr, dwCallback,
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dwInstance, fdwOpen);
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(MSACM32.DLL, acmStreamOpen)
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HOOK_END
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IMPLEMENT_SHIM_END
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