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	/***************************************************************************
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	#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(BufferSizesizeof(float));
45	#else
46	this->pBuffer = (float ) memalign(16,BufferSizesizeof(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	* @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() {
179	return Parameters;
180	}
181	}