/[svn]/linuxsampler/trunk/src/drivers/audio/AudioChannel.cpp
ViewVC logotype

Contents of /linuxsampler/trunk/src/drivers/audio/AudioChannel.cpp

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1004 - (show annotations) (download)
Thu Dec 28 18:05:14 2006 UTC (13 years, 10 months ago) by schoenebeck
File size: 5824 byte(s)
* fixed noise which occured while using effect sends

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 * Copyright (C) 2005, 2006 Christian Schoenebeck *
7 * *
8 * 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 *
10 * the Free Software Foundation; either version 2 of the License, or *
11 * (at your option) any later version. *
12 * *
13 * This program is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16 * GNU General Public License for more details. *
17 * *
18 * You should have received a copy of the GNU General Public License *
19 * along with this program; if not, write to the Free Software *
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21 * MA 02111-1307 USA *
22 ***************************************************************************/
23
24 #include "AudioChannel.h"
25
26 #if defined(__APPLE__)
27 # include <stdlib.h>
28 #else
29 # include <malloc.h>
30 #endif
31
32
33 namespace LinuxSampler {
34
35 /**
36 * Create real channel.
37 *
38 * @param ChannelNr - channel number of this new channel
39 * @param BufferSize - desired audio data buffer size
40 */
41 AudioChannel::AudioChannel(uint ChannelNr, uint BufferSize) {
42 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));
47 #endif
48 this->uiBufferSize = BufferSize;
49 this->pMixChannel = NULL;
50 this->UsesExternalBuffer = false;
51
52 Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
53 Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);
54
55 Clear();
56 }
57
58 /**
59 * Create channel with external (already existing) audio buffer.
60 *
61 * @param ChannelNr - channel number of this new channel
62 * @param pBuffer - external audio buffer
63 * @param BufferSIze - size of the external buffer
64 */
65 AudioChannel::AudioChannel(uint ChannelNr, float* pBuffer, uint BufferSize) {
66 this->ChannelNr = ChannelNr;
67 this->pBuffer = pBuffer;
68 this->uiBufferSize = BufferSize;
69 this->pMixChannel = NULL;
70 this->UsesExternalBuffer = true;
71
72 Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
73 Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);
74
75 Clear();
76 }
77
78 /**
79 * Create mix channel.
80 *
81 * @param ChannelNr - channel number of this new channel
82 * @param pMixChannelDestination - a real audio channel this new mix
83 * channel refers to
84 */
85 AudioChannel::AudioChannel(uint ChannelNr, AudioChannel* pMixChannelDestination) {
86 this->ChannelNr = ChannelNr;
87 this->pBuffer = pMixChannelDestination->Buffer();
88 this->uiBufferSize = pMixChannelDestination->uiBufferSize;
89 this->pMixChannel = pMixChannelDestination;
90 this->UsesExternalBuffer = true;
91
92 Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
93 Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(true);
94 //TODO: Parameters["MIX_CHANNEL_DESTINATION"] = new ParameterMixChannelDestination(dest_chan);
95
96 Clear();
97 }
98
99 /**
100 * Destructor
101 */
102 AudioChannel::~AudioChannel() {
103 std::map<String,DeviceRuntimeParameter*>::iterator iter = Parameters.begin();
104 while (iter != Parameters.end()) { delete iter->second; iter++; }
105 if (!UsesExternalBuffer) free(pBuffer);
106 }
107
108 /**
109 * Copies audio data (unmodified) from this AudioChannel to the given
110 * destination AudioChannel.
111 *
112 * @param pDst - destination channel
113 * @param Samples - amount of sample points to be copied
114 */
115 void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples) {
116 memcpy(pDst->Buffer(), Buffer(), Samples * sizeof(float));
117 }
118
119 /**
120 * Copies audio data from this AudioChannel to the given destination
121 * AudioChannel and applies the given volume coefficient to the
122 * destination audio signal.
123 *
124 * @param pDst - destination channel
125 * @param Samples - amount of sample points to be copied
126 * @param fLevel - volume coefficient to be applied
127 */
128 void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
129 if (fLevel == 1.0f) CopyTo(pDst, Samples);
130 else {
131 float* pSrcBuf = Buffer();
132 float* pDstBuf = pDst->Buffer();
133 for (int i = 0; i < Samples; i++)
134 pDstBuf[i] = pSrcBuf[i] * fLevel;
135 }
136 }
137
138 std::map<String,DeviceRuntimeParameter*> AudioChannel::ChannelParameters() {
139 return Parameters;
140 }
141 }

  ViewVC Help
Powered by ViewVC