/[svn]/linuxsampler/trunk/src/drivers/audio/AudioChannel.cpp
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Diff of /linuxsampler/trunk/src/drivers/audio/AudioChannel.cpp

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revision 331 by senkov, Thu Dec 30 04:00:03 2004 UTC revision 1037 by schoenebeck, Tue Jan 23 20:03:22 2007 UTC
# Line 3  Line 3 
3   *   LinuxSampler - modular, streaming capable sampler                     *   *   LinuxSampler - modular, streaming capable sampler                     *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
6     *   Copyright (C) 2005 - 2007 Christian Schoenebeck                       *
7   *                                                                         *   *                                                                         *
8   *   This program is free software; you can redistribute it and/or modify  *   *   This program is free software; you can redistribute it and/or modify  *
9   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
# Line 21  Line 22 
22   ***************************************************************************/   ***************************************************************************/
23    
24  #include "AudioChannel.h"  #include "AudioChannel.h"
25  #include <malloc.h>  
26    #if defined(__APPLE__)
27    # include <stdlib.h>
28    #else
29    # include <malloc.h>
30    #endif
31    
32    
33  namespace LinuxSampler {  namespace LinuxSampler {
34    
# Line 33  namespace LinuxSampler { Line 40  namespace LinuxSampler {
40       */       */
41      AudioChannel::AudioChannel(uint ChannelNr, uint BufferSize) {      AudioChannel::AudioChannel(uint ChannelNr, uint BufferSize) {
42          this->ChannelNr          = ChannelNr;          this->ChannelNr          = ChannelNr;
43            #if defined(__APPLE__)
44            this->pBuffer            = (float *) malloc(BufferSize*sizeof(float));
45            #else
46          this->pBuffer            = (float *) memalign(16,BufferSize*sizeof(float));          this->pBuffer            = (float *) memalign(16,BufferSize*sizeof(float));
47            #endif
48          this->uiBufferSize       = BufferSize;          this->uiBufferSize       = BufferSize;
49          this->pMixChannel        = NULL;          this->pMixChannel        = NULL;
50          this->UsesExternalBuffer = false;          this->UsesExternalBuffer = false;
# Line 94  namespace LinuxSampler { Line 105  namespace LinuxSampler {
105          if (!UsesExternalBuffer) free(pBuffer);          if (!UsesExternalBuffer) free(pBuffer);
106      }      }
107    
108        /**
109         * Copies audio data (unmodified) from this AudioChannel to the given
110         * destination AudioChannel.
111         *
112         * @e Caution: This method will overwrite the content in the destination
113         * channel buffer.
114         *
115         * @param pDst    - destination channel
116         * @param Samples - amount of sample points to be copied
117         */
118        void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples) {
119            memcpy(pDst->Buffer(), Buffer(), Samples * sizeof(float));
120        }
121    
122        /**
123         * Copies audio data from this AudioChannel to the given destination
124         * AudioChannel and applies the given volume coefficient to the
125         * destination audio signal.
126         *
127         * @e Caution: This method will overwrite the content in the destination
128         * channel buffer.
129         *
130         * @param pDst    - destination channel
131         * @param Samples - amount of sample points to be copied
132         * @param fLevel  - volume coefficient to be applied
133         */
134        void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
135            if (fLevel == 1.0f) CopyTo(pDst, Samples);
136            else {
137                float* pSrcBuf = Buffer();
138                float* pDstBuf = pDst->Buffer();
139                for (int i = 0; i < Samples; i++)
140                    pDstBuf[i] = pSrcBuf[i] * fLevel;
141            }
142        }
143    
144        /**
145         * Copies audio data (unmodified) from this AudioChannel and mixes it to the
146         * given destination AudioChannel.
147         *
148         * @param pDst    - destination channel
149         * @param Samples - amount of sample points to be mixed over
150         */
151        void AudioChannel::MixTo(AudioChannel* pDst, const uint Samples) {
152            //TODO: there's probably a more efficient way to do this ...
153            float* pSrcBuf = Buffer();
154            float* pDstBuf = pDst->Buffer();
155            for (int i = 0; i < Samples; i++)
156                pDstBuf[i] += pSrcBuf[i];
157        }
158    
159        /**
160         * Copies audio data from this AudioChannel, applies the given volume
161         * coefficient to the audio signal and mixes it to the given destination
162         * channel.
163         *
164         * @param pDst    - destination channel
165         * @param Samples - amount of sample points to be mixed over
166         * @param fLevel  - volume coefficient to be applied
167         */
168        void AudioChannel::MixTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
169            if (fLevel == 1.0f) MixTo(pDst, Samples);
170            else {
171                float* pSrcBuf = Buffer();
172                float* pDstBuf = pDst->Buffer();
173                for (int i = 0; i < Samples; i++)
174                    pDstBuf[i] += pSrcBuf[i] * fLevel;
175            }
176        }
177    
178      std::map<String,DeviceRuntimeParameter*> AudioChannel::ChannelParameters() {      std::map<String,DeviceRuntimeParameter*> AudioChannel::ChannelParameters() {
179          return Parameters;          return Parameters;
180      }      }
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