drivers/audio/AudioChannel.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2007 Christian Schoenebeck                       *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#include "AudioChannel.h"

#if defined(__APPLE__)
# include <stdlib.h>
#else
# include <malloc.h>
#endif


namespace LinuxSampler {

    /**
     * Create real channel.
     *
     * @param ChannelNr  - channel number of this new channel
     * @param BufferSize - desired audio data buffer size
     */
    AudioChannel::AudioChannel(uint ChannelNr, uint BufferSize) {
        this->ChannelNr          = ChannelNr;
        #if defined(__APPLE__)
        this->pBuffer            = (float *) malloc(BufferSize*sizeof(float));
        #else
        this->pBuffer            = (float *) memalign(16,BufferSize*sizeof(float));
        #endif
        this->uiBufferSize       = BufferSize;
        this->pMixChannel        = NULL;
        this->UsesExternalBuffer = false;

        Parameters["NAME"]           = new ParameterName("Channel " + ToString(ChannelNr));
        Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);

        Clear();
    }

    /**
     * Create channel with external (already existing) audio buffer.
     *
     * @param ChannelNr  - channel number of this new channel
     * @param pBuffer    - external audio buffer
     * @param BufferSIze - size of the external buffer
     */
    AudioChannel::AudioChannel(uint ChannelNr, float* pBuffer, uint BufferSize) {
        this->ChannelNr          = ChannelNr;
        this->pBuffer            = pBuffer;
        this->uiBufferSize       = BufferSize;
        this->pMixChannel        = NULL;
        this->UsesExternalBuffer = true;

        Parameters["NAME"]           = new ParameterName("Channel " + ToString(ChannelNr));
        Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);

        Clear();
    }

    /**
     * Create mix channel.
     *
     * @param ChannelNr              - channel number of this new channel
     * @param pMixChannelDestination - a real audio channel this new mix
     *                                 channel refers to
     */
    AudioChannel::AudioChannel(uint ChannelNr, AudioChannel* pMixChannelDestination) {
        this->ChannelNr          = ChannelNr;
        this->pBuffer            = pMixChannelDestination->Buffer();
        this->uiBufferSize       = pMixChannelDestination->uiBufferSize;
        this->pMixChannel        = pMixChannelDestination;
        this->UsesExternalBuffer = true;

        Parameters["NAME"]           = new ParameterName("Channel " + ToString(ChannelNr));
        Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(true);
        //TODO: Parameters["MIX_CHANNEL_DESTINATION"] = new ParameterMixChannelDestination(dest_chan);

        Clear();
    }

    /**
     * Destructor
     */
    AudioChannel::~AudioChannel() {
        std::map<String,DeviceRuntimeParameter*>::iterator iter = Parameters.begin();
        while (iter != Parameters.end()) { delete iter->second; iter++; }
        if (!UsesExternalBuffer) free(pBuffer);
    }

    /**
     * Copies audio data (unmodified) from this AudioChannel to the given
     * destination AudioChannel.
     *
     * @e Caution: This method will overwrite the content in the destination
     * channel buffer.
     *
     * @param pDst    - destination channel
     * @param Samples - amount of sample points to be copied
     */
    void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples) {
        memcpy(pDst->Buffer(), Buffer(), Samples * sizeof(float));
    }

    /**
     * Copies audio data from this AudioChannel to the given destination
     * AudioChannel and applies the given volume coefficient to the
     * destination audio signal.
     *
     * @e Caution: This method will overwrite the content in the destination
     * channel buffer.
     *
     * @param pDst    - destination channel
     * @param Samples - amount of sample points to be copied
     * @param fLevel  - volume coefficient to be applied
     */
    void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
        if (fLevel == 1.0f) CopyTo(pDst, Samples);
        else {
            float* pSrcBuf = Buffer();
            float* pDstBuf = pDst->Buffer();
            for (int i = 0; i < Samples; i++)
                pDstBuf[i] = pSrcBuf[i] * fLevel;
        }
    }

    /**
     * Copies audio data (unmodified) from this AudioChannel and mixes it to the
     * given destination AudioChannel.
     *
     * @param pDst    - destination channel
     * @param Samples - amount of sample points to be mixed over
     */
    void AudioChannel::MixTo(AudioChannel* pDst, const uint Samples) {
        //TODO: there's probably a more efficient way to do this ...
        float* pSrcBuf = Buffer();
        float* pDstBuf = pDst->Buffer();
        for (int i = 0; i < Samples; i++)
            pDstBuf[i] += pSrcBuf[i];
    }

    /**
     * Copies audio data from this AudioChannel, applies the given volume
     * coefficient to the audio signal and mixes it to the given destination
     * channel.
     *
     * @param pDst    - destination channel
     * @param Samples - amount of sample points to be mixed over
     * @param fLevel  - volume coefficient to be applied
     */
    void AudioChannel::MixTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
        if (fLevel == 1.0f) MixTo(pDst, Samples);
        else {
            float* pSrcBuf = Buffer();
            float* pDstBuf = pDst->Buffer();
            for (int i = 0; i < Samples; i++)
                pDstBuf[i] += pSrcBuf[i] * fLevel;
        }
    }

    std::map<String,DeviceRuntimeParameter*> AudioChannel::ChannelParameters() {
        return Parameters;
    }
}
1	schoenebeck	200	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	1037	* Copyright (C) 2005 - 2007 Christian Schoenebeck *
7	schoenebeck	200	* *
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	schoenebeck	361	#if defined(__APPLE__)
27			# include <stdlib.h>
28			#else
29			# include <malloc.h>
30			#endif
31
32
33	schoenebeck	200	namespace LinuxSampler {
34
35			/**
36			* Create real channel.
37			*
38	schoenebeck	226	* @param ChannelNr - channel number of this new channel
39	schoenebeck	200	* @param BufferSize - desired audio data buffer size
40			*/
41	schoenebeck	226	AudioChannel::AudioChannel(uint ChannelNr, uint BufferSize) {
42			this->ChannelNr = ChannelNr;
43	schoenebeck	361	#if defined(__APPLE__)
44			this->pBuffer = (float ) malloc(BufferSizesizeof(float));
45			#else
46	schoenebeck	319	this->pBuffer = (float ) memalign(16,BufferSizesizeof(float));
47	schoenebeck	361	#endif
48	schoenebeck	200	this->uiBufferSize = BufferSize;
49			this->pMixChannel = NULL;
50			this->UsesExternalBuffer = false;
51
52	schoenebeck	226	Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
53			Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);
54	schoenebeck	200
55			Clear();
56			}
57
58			/**
59			* Create channel with external (already existing) audio buffer.
60			*
61	schoenebeck	226	* @param ChannelNr - channel number of this new channel
62	schoenebeck	200	* @param pBuffer - external audio buffer
63			* @param BufferSIze - size of the external buffer
64			*/
65	schoenebeck	226	AudioChannel::AudioChannel(uint ChannelNr, float* pBuffer, uint BufferSize) {
66			this->ChannelNr = ChannelNr;
67	schoenebeck	200	this->pBuffer = pBuffer;
68			this->uiBufferSize = BufferSize;
69			this->pMixChannel = NULL;
70			this->UsesExternalBuffer = true;
71
72	schoenebeck	226	Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
73			Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);
74	schoenebeck	200
75			Clear();
76			}
77
78			/**
79			* Create mix channel.
80			*
81	schoenebeck	226	* @param ChannelNr - channel number of this new channel
82			* @param pMixChannelDestination - a real audio channel this new mix
83			* channel refers to
84	schoenebeck	200	*/
85	schoenebeck	226	AudioChannel::AudioChannel(uint ChannelNr, AudioChannel* pMixChannelDestination) {
86			this->ChannelNr = ChannelNr;
87	senkov	331	this->pBuffer = pMixChannelDestination->Buffer();
88			this->uiBufferSize = pMixChannelDestination->uiBufferSize;
89			this->pMixChannel = pMixChannelDestination;
90	schoenebeck	200	this->UsesExternalBuffer = true;
91
92	schoenebeck	226	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	schoenebeck	200
96			Clear();
97			}
98
99			/**
100			* Destructor
101			*/
102			AudioChannel::~AudioChannel() {
103	schoenebeck	226	std::map<String,DeviceRuntimeParameter*>::iterator iter = Parameters.begin();
104			while (iter != Parameters.end()) { delete iter->second; iter++; }
105	schoenebeck	319	if (!UsesExternalBuffer) free(pBuffer);
106	schoenebeck	200	}
107
108	schoenebeck	1001	/**
109			* Copies audio data (unmodified) from this AudioChannel to the given
110			* destination AudioChannel.
111			*
112	schoenebeck	1037	* @e Caution: This method will overwrite the content in the destination
113			* channel buffer.
114			*
115	schoenebeck	1001	* @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	schoenebeck	1004	memcpy(pDst->Buffer(), Buffer(), Samples * sizeof(float));
120	schoenebeck	1001	}
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	schoenebeck	1037	* @e Caution: This method will overwrite the content in the destination
128			* channel buffer.
129			*
130	schoenebeck	1001	* @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	schoenebeck	1037	/**
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	schoenebeck	200	std::map<String,DeviceRuntimeParameter*> AudioChannel::ChannelParameters() {
179	schoenebeck	226	return Parameters;
180	schoenebeck	200	}
181			}