hxmixer.cpp
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #include "hlxclib/memory.h"
-
- #include "hxresult.h"
- #include "hxtypes.h"
- #include "hxmixer.h"
- #include "hxcom.h"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- /************************************************************************
- * Method:
- * CHXMixer::MixBuffer()
- * Purpose:
- * NOTE: This routine may change the Source Buffer contents in order
- * to multiple it by volume
- */
- ULONG32 CHXMixer::MixBuffer
- (
- UCHAR* pSrc
- , UCHAR* pDst
- , ULONG32 ulNumBytes
- , BOOL bChannelConvert
- , UINT16 uVolume
- , UINT16 uBitsPerSample
- , BOOL& bIsDestBufferDirty
- )
- {
- if (!(bIsDestBufferDirty || bChannelConvert || uVolume != 100))
- {
- ::memcpy(pDst, pSrc, ulNumBytes); /* Flawfinder: ignore */
- bIsDestBufferDirty = TRUE;
- return ulNumBytes;
- }
- ULONG32 nSamples = 0;
- ULONG32 i,j;
- LONG32 lFixedVolume = (uVolume*256)/100;
- if (bIsDestBufferDirty)
- {
- if ( uBitsPerSample == 16 )
- {
- short *dst = (short*)pDst;
- short *src = (short*)pSrc;
- LONG32 lTmp = 0;
- if ( !bChannelConvert )
- {
- nSamples = ulNumBytes / 2;
- for(i = 0, j=0; i < nSamples; i++,j++)
- {
- lTmp = *(dst+j) + (((LONG32)(lFixedVolume * (*(src+i)))) >> 8);
- //lTmp = *(dst+j) + (*(src+i));
- // clip if need to
- if ( lTmp > 32767 )
- *(dst+j) = 32767;
- else if ( lTmp < -32768 )
- *(dst+j) = -32768;
- else
- *(dst+j) = (short)lTmp;
- }
- }
- // Add the sample in again if we are converting this from
- // mono to stereo.
- else if ( bChannelConvert )
- {
- short itmp = 0;
- nSamples = ulNumBytes / 2;
- for(i = 0, j=0; i < nSamples; i++,j++)
- {
- lTmp = *(dst+j) + (LONG32) (((LONG32)(lFixedVolume * (*(src+i)))) >> 8);
- //lTmp = *(dst+j) + (*(src+i));
- // clip if need to
- if ( lTmp > 32767 )
- (*(dst+j)) = 32767;
- else if ( lTmp < -32768 )
- (*(dst+j)) = -32768;
- else
- (*(dst+j)) = (short)lTmp;
- // Add this sample in twice for stereo
- itmp = (*(dst+j));
- j++;
- (*(dst+j)) = itmp;
- }
- }
- }
- else if ( uBitsPerSample == 8 )
- {
- UCHAR* dst = pDst;
- UCHAR* src = pSrc;
- LONG32 uTmp = 0;
- for(i = 0; i < ulNumBytes; i++)
- {
- uTmp = (LONG32) *(dst+i) + (LONG32) (((LONG32)(lFixedVolume * (*(src+i)))) >> 8);
- //uTmp = *(dst+i) + (*(src+i)) ;
- // clip if needed
- if ( uTmp > 255 )
- *(dst+i) = 255;
- else
- *(dst+i) = (UCHAR)uTmp;
- }
- }
- }
- else
- {
- if ( uBitsPerSample == 16 )
- {
- short *dst = (short*)pDst;
- short *src = (short*)pSrc;
- LONG32 lTmp = 0;
- if ( !bChannelConvert )
- {
- nSamples = ulNumBytes / 2;
- for(i = 0, j=0; i < nSamples; i++,j++)
- {
- lTmp = (((LONG32)(lFixedVolume * (*(src+i)))) >> 8);
- // clip if need to
- if ( lTmp > 32767 )
- *(dst+j) = 32767;
- else if ( lTmp < -32768 )
- *(dst+j) = -32768;
- else
- *(dst+j) = (short)lTmp;
- }
- }
- // Add the sample in again if we are converting this from
- // mono to stereo.
- else if ( bChannelConvert )
- {
- short itmp = 0;
- nSamples = ulNumBytes / 2;
- for(i = 0, j=0; i < nSamples; i++,j++)
- {
- lTmp = (LONG32) (((LONG32)(lFixedVolume * (*(src+i)))) >> 8);
- //lTmp = *(dst+j) + (*(src+i));
- // clip if need to
- if ( lTmp > 32767 )
- (*(dst+j)) = 32767;
- else if ( lTmp < -32768 )
- (*(dst+j)) = -32768;
- else
- (*(dst+j)) = (short)lTmp;
- // Add this sample in twice for stereo
- itmp = (*(dst+j));
- j++;
- (*(dst+j)) = itmp;
- }
- }
- }
- else if ( uBitsPerSample == 8 )
- {
- UCHAR* dst = pDst;
- UCHAR* src = pSrc;
- LONG32 uTmp = 0;
- for(i = 0; i < ulNumBytes; i++)
- {
- uTmp = (LONG32) (((LONG32)(lFixedVolume * (*(src+i)))) >> 8);
- //uTmp = *(dst+i) + (*(src+i)) ;
- // clip if needed
- if ( uTmp > 255 )
- *(dst+i) = 255;
- else
- *(dst+i) = (UCHAR)uTmp;
- }
- }
- }
- bIsDestBufferDirty = TRUE;
- return bChannelConvert ? ulNumBytes*2 : ulNumBytes;
- }
- /************************************************************************
- * Method:
- * CHXMixer::ApplyVolume()
- * Purpose:
- * NOTE: This routine simply multiplies input buffer by volume
- */
- void CHXMixer::ApplyVolume
- (
- UCHAR* pSrc
- , ULONG32 ulNumBytes
- , UINT16 uVolume
- , UINT16 uBitsPerSample
- )
- {
- ULONG32 nSamples = 0;
- ULONG32 i;
- LONG32 lFixedVolume = (uVolume*256)/100;
- if ( uBitsPerSample == 16 )
- {
- short *dst = (short*)pSrc;
- short *src = (short*)pSrc;
- LONG32 lTmp = 0;
- nSamples = ulNumBytes / 2;
- for(i = 0; i < nSamples; i++)
- {
- lTmp = (((LONG32)(lFixedVolume * (*(src+i)))) >> 8);
- //lTmp = *(dst+j) + (*(src+i));
- // clip if need to
- if ( lTmp > 32767 )
- *(dst+i) = 32767;
- else if ( lTmp < -32768 )
- *(dst+i) = -32768;
- else
- *(dst+i) = (short)lTmp;
- }
- }
- else if ( uBitsPerSample == 8 )
- {
- UCHAR* dst = pSrc;
- UCHAR* src = pSrc;
- LONG32 uTmp = 0;
- for(i = 0; i < ulNumBytes; i++)
- {
- uTmp = (LONG32) (((LONG32)(lFixedVolume * (*(src+i)))) >> 8);
- //uTmp = *(dst+i) + (*(src+i)) ;
- // clip if needed
- if ( uTmp > 255 )
- *(dst+i) = 255;
- else
- *(dst+i) = (UCHAR)uTmp;
- }
- }
- return;
- }