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"

#include "../../common/global_private.h"
#include "../../common/Thread.h" // needed for allocAlignedMem() and freeAlignedMem()

#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;
        this->pBuffer            = (float *) Thread::allocAlignedMem(16,BufferSize*sizeof(float));
        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) Thread::freeAlignedMem(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	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* 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 *
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	#include "../../common/global_private.h"
27	#include "../../common/Thread.h" // needed for allocAlignedMem() and freeAlignedMem()
28
29	#if defined(__APPLE__)
30	# include <stdlib.h>
31	#else
32	# include <malloc.h>
33	#endif
34
35
36	namespace LinuxSampler {
37
38	/**
39	* Create real channel.
40	*
41	* @param ChannelNr - channel number of this new channel
42	* @param BufferSize - desired audio data buffer size
43	*/
44	AudioChannel::AudioChannel(uint ChannelNr, uint BufferSize) {
45	this->ChannelNr = ChannelNr;
46	this->pBuffer = (float ) Thread::allocAlignedMem(16,BufferSizesizeof(float));
47	this->uiBufferSize = BufferSize;
48	this->pMixChannel = NULL;
49	this->UsesExternalBuffer = false;
50
51	Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
52	Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);
53
54	Clear();
55	}
56
57	/**
58	* Create channel with external (already existing) audio buffer.
59	*
60	* @param ChannelNr - channel number of this new channel
61	* @param pBuffer - external audio buffer
62	* @param BufferSize - size of the external buffer
63	*/
64	AudioChannel::AudioChannel(uint ChannelNr, float* pBuffer, uint BufferSize) {
65	this->ChannelNr = ChannelNr;
66	this->pBuffer = pBuffer;
67	this->uiBufferSize = BufferSize;
68	this->pMixChannel = NULL;
69	this->UsesExternalBuffer = true;
70
71	Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
72	Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);
73
74	Clear();
75	}
76
77	/**
78	* Create mix channel.
79	*
80	* @param ChannelNr - channel number of this new channel
81	* @param pMixChannelDestination - a real audio channel this new mix
82	* channel refers to
83	*/
84	AudioChannel::AudioChannel(uint ChannelNr, AudioChannel* pMixChannelDestination) {
85	this->ChannelNr = ChannelNr;
86	this->pBuffer = pMixChannelDestination->Buffer();
87	this->uiBufferSize = pMixChannelDestination->uiBufferSize;
88	this->pMixChannel = pMixChannelDestination;
89	this->UsesExternalBuffer = true;
90
91	Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
92	Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(true);
93	//TODO: Parameters["MIX_CHANNEL_DESTINATION"] = new ParameterMixChannelDestination(dest_chan);
94
95	Clear();
96	}
97
98	/**
99	* Destructor
100	*/
101	AudioChannel::~AudioChannel() {
102	std::map<String,DeviceRuntimeParameter*>::iterator iter = Parameters.begin();
103	while (iter != Parameters.end()) { delete iter->second; iter++; }
104	if (!UsesExternalBuffer) Thread::freeAlignedMem(pBuffer);
105	}
106
107	/**
108	* Copies audio data (unmodified) from this AudioChannel to the given
109	* destination AudioChannel.
110	*
111	* @e Caution: This method will overwrite the content in the destination
112	* channel buffer.
113	*
114	* @param pDst - destination channel
115	* @param Samples - amount of sample points to be copied
116	*/
117	void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples) {
118	memcpy(pDst->Buffer(), Buffer(), Samples * sizeof(float));
119	}
120
121	/**
122	* Copies audio data from this AudioChannel to the given destination
123	* AudioChannel and applies the given volume coefficient to the
124	* destination audio signal.
125	*
126	* @e Caution: This method will overwrite the content in the destination
127	* channel buffer.
128	*
129	* @param pDst - destination channel
130	* @param Samples - amount of sample points to be copied
131	* @param fLevel - volume coefficient to be applied
132	*/
133	void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
134	if (fLevel == 1.0f) CopyTo(pDst, Samples);
135	else {
136	float* pSrcBuf = Buffer();
137	float* pDstBuf = pDst->Buffer();
138	for (int i = 0; i < Samples; i++)
139	pDstBuf[i] = pSrcBuf[i] * fLevel;
140	}
141	}
142
143	/**
144	* Copies audio data (unmodified) from this AudioChannel and mixes it to the
145	* given destination AudioChannel.
146	*
147	* @param pDst - destination channel
148	* @param Samples - amount of sample points to be mixed over
149	*/
150	void AudioChannel::MixTo(AudioChannel* pDst, const uint Samples) {
151	//TODO: there's probably a more efficient way to do this ...
152	float* pSrcBuf = Buffer();
153	float* pDstBuf = pDst->Buffer();
154	for (int i = 0; i < Samples; i++)
155	pDstBuf[i] += pSrcBuf[i];
156	}
157
158	/**
159	* Copies audio data from this AudioChannel, applies the given volume
160	* coefficient to the audio signal and mixes it to the given destination
161	* channel.
162	*
163	* @param pDst - destination channel
164	* @param Samples - amount of sample points to be mixed over
165	* @param fLevel - volume coefficient to be applied
166	*/
167	void AudioChannel::MixTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
168	if (fLevel == 1.0f) MixTo(pDst, Samples);
169	else {
170	float* pSrcBuf = Buffer();
171	float* pDstBuf = pDst->Buffer();
172	for (int i = 0; i < Samples; i++)
173	pDstBuf[i] += pSrcBuf[i] * fLevel;
174	}
175	}
176
177	std::map<String,DeviceRuntimeParameter*> AudioChannel::ChannelParameters() {
178	return Parameters;
179	}
180	}