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"

#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	/***************************************************************************
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
28	#if defined(__APPLE__)
29	# include <stdlib.h>
30	#else
31	# include <malloc.h>
32	#endif
33
34
35	namespace LinuxSampler {
36
37	/**
38	* Create real channel.
39	*
40	* @param ChannelNr - channel number of this new channel
41	* @param BufferSize - desired audio data buffer size
42	*/
43	AudioChannel::AudioChannel(uint ChannelNr, uint BufferSize) {
44	this->ChannelNr = ChannelNr;
45	#if defined(__APPLE__)
46	this->pBuffer = (float ) malloc(BufferSizesizeof(float));
47	#else
48	this->pBuffer = (float ) memalign(16,BufferSizesizeof(float));
49	#endif
50	this->uiBufferSize = BufferSize;
51	this->pMixChannel = NULL;
52	this->UsesExternalBuffer = false;
53
54	Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
55	Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);
56
57	Clear();
58	}
59
60	/**
61	* Create channel with external (already existing) audio buffer.
62	*
63	* @param ChannelNr - channel number of this new channel
64	* @param pBuffer - external audio buffer
65	* @param BufferSize - size of the external buffer
66	*/
67	AudioChannel::AudioChannel(uint ChannelNr, float* pBuffer, uint BufferSize) {
68	this->ChannelNr = ChannelNr;
69	this->pBuffer = pBuffer;
70	this->uiBufferSize = BufferSize;
71	this->pMixChannel = NULL;
72	this->UsesExternalBuffer = true;
73
74	Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
75	Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(false);
76
77	Clear();
78	}
79
80	/**
81	* Create mix channel.
82	*
83	* @param ChannelNr - channel number of this new channel
84	* @param pMixChannelDestination - a real audio channel this new mix
85	* channel refers to
86	*/
87	AudioChannel::AudioChannel(uint ChannelNr, AudioChannel* pMixChannelDestination) {
88	this->ChannelNr = ChannelNr;
89	this->pBuffer = pMixChannelDestination->Buffer();
90	this->uiBufferSize = pMixChannelDestination->uiBufferSize;
91	this->pMixChannel = pMixChannelDestination;
92	this->UsesExternalBuffer = true;
93
94	Parameters["NAME"] = new ParameterName("Channel " + ToString(ChannelNr));
95	Parameters["IS_MIX_CHANNEL"] = new ParameterIsMixChannel(true);
96	//TODO: Parameters["MIX_CHANNEL_DESTINATION"] = new ParameterMixChannelDestination(dest_chan);
97
98	Clear();
99	}
100
101	/**
102	* Destructor
103	*/
104	AudioChannel::~AudioChannel() {
105	std::map<String,DeviceRuntimeParameter*>::iterator iter = Parameters.begin();
106	while (iter != Parameters.end()) { delete iter->second; iter++; }
107	if (!UsesExternalBuffer) free(pBuffer);
108	}
109
110	/**
111	* Copies audio data (unmodified) from this AudioChannel to the given
112	* destination AudioChannel.
113	*
114	* @e Caution: This method will overwrite the content in the destination
115	* channel buffer.
116	*
117	* @param pDst - destination channel
118	* @param Samples - amount of sample points to be copied
119	*/
120	void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples) {
121	memcpy(pDst->Buffer(), Buffer(), Samples * sizeof(float));
122	}
123
124	/**
125	* Copies audio data from this AudioChannel to the given destination
126	* AudioChannel and applies the given volume coefficient to the
127	* destination audio signal.
128	*
129	* @e Caution: This method will overwrite the content in the destination
130	* channel buffer.
131	*
132	* @param pDst - destination channel
133	* @param Samples - amount of sample points to be copied
134	* @param fLevel - volume coefficient to be applied
135	*/
136	void AudioChannel::CopyTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
137	if (fLevel == 1.0f) CopyTo(pDst, Samples);
138	else {
139	float* pSrcBuf = Buffer();
140	float* pDstBuf = pDst->Buffer();
141	for (int i = 0; i < Samples; i++)
142	pDstBuf[i] = pSrcBuf[i] * fLevel;
143	}
144	}
145
146	/**
147	* Copies audio data (unmodified) from this AudioChannel and mixes it to the
148	* given destination AudioChannel.
149	*
150	* @param pDst - destination channel
151	* @param Samples - amount of sample points to be mixed over
152	*/
153	void AudioChannel::MixTo(AudioChannel* pDst, const uint Samples) {
154	//TODO: there's probably a more efficient way to do this ...
155	float* pSrcBuf = Buffer();
156	float* pDstBuf = pDst->Buffer();
157	for (int i = 0; i < Samples; i++)
158	pDstBuf[i] += pSrcBuf[i];
159	}
160
161	/**
162	* Copies audio data from this AudioChannel, applies the given volume
163	* coefficient to the audio signal and mixes it to the given destination
164	* channel.
165	*
166	* @param pDst - destination channel
167	* @param Samples - amount of sample points to be mixed over
168	* @param fLevel - volume coefficient to be applied
169	*/
170	void AudioChannel::MixTo(AudioChannel* pDst, const uint Samples, const float fLevel) {
171	if (fLevel == 1.0f) MixTo(pDst, Samples);
172	else {
173	float* pSrcBuf = Buffer();
174	float* pDstBuf = pDst->Buffer();
175	for (int i = 0; i < Samples; i++)
176	pDstBuf[i] += pSrcBuf[i] * fLevel;
177	}
178	}
179
180	std::map<String,DeviceRuntimeParameter*> AudioChannel::ChannelParameters() {
181	return Parameters;
182	}
183	}