src/audiodriver/AudioOutputDevice.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003 by Benno Senoner and 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 "AudioOutputDevice.h"

namespace LinuxSampler {

    void AudioOutputDevice::Connect(Engine* pEngine) {
        if (Engines.find(pEngine) == Engines.end()) {
            pEngine->Connect(this);
            Engines.insert(pEngine);
        }
    }

    void AudioOutputDevice::Disconnect(Engine* pEngine) {
        if (Engines.find(pEngine) != Engines.end()) { // if clause to prevent disconnect loop
            Engines.erase(pEngine);
            pEngine->DisconnectAudioOutputDevice();
        }
    }

    AudioChannel* AudioOutputDevice::Channel(uint ChannelIndex) {
        return (ChannelIndex < Channels.size()) ? Channels[ChannelIndex] : NULL;
    }

    int AudioOutputDevice::RenderAudio(uint Samples) {
        if (Channels.empty()) return 0;

        // reset all channels with silence
        {
            std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
            std::vector<AudioChannel*>::iterator end          = Channels.end();
            for (; iterChannels != end; iterChannels++)
                (*iterChannels)->Clear(); // zero out audio buffer
        }

        int result = 0;

        // let all connected engines render audio for the current audio fragment cycle
        {
            std::set<Engine*>::iterator iterEngine = Engines.begin();
            std::set<Engine*>::iterator end        = Engines.end();
            for (; iterEngine != end; iterEngine++) {
                int res = (*iterEngine)->RenderAudio(Samples);
                if (res != 0) result = res;
            }
        }

        return result;
    }

    int AudioOutputDevice::RenderSilence(uint Samples) {
        if (Channels.empty()) return 0;

        // reset all channels with silence
        {
            std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
            std::vector<AudioChannel*>::iterator end          = Channels.end();
            for (; iterChannels != end; iterChannels++)
                (*iterChannels)->Clear(); // zero out audio buffer
        }

        return 0;
    }

} // namespace LinuxSampler
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck *
6			* *
7			* This program is free software; you can redistribute it and/or modify *
8			* it under the terms of the GNU General Public License as published by *
9			* the Free Software Foundation; either version 2 of the License, or *
10			* (at your option) any later version. *
11			* *
12			* This program is distributed in the hope that it will be useful, *
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15			* GNU General Public License for more details. *
16			* *
17			* You should have received a copy of the GNU General Public License *
18			* along with this program; if not, write to the Free Software *
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20			* MA 02111-1307 USA *
21			***************************************************************************/
22
23			#include "AudioOutputDevice.h"
24
25			namespace LinuxSampler {
26
27			void AudioOutputDevice::Connect(Engine* pEngine) {
28			if (Engines.find(pEngine) == Engines.end()) {
29			pEngine->Connect(this);
30			Engines.insert(pEngine);
31			}
32			}
33
34			void AudioOutputDevice::Disconnect(Engine* pEngine) {
35			if (Engines.find(pEngine) != Engines.end()) { // if clause to prevent disconnect loop
36			Engines.erase(pEngine);
37			pEngine->DisconnectAudioOutputDevice();
38			}
39			}
40
41			AudioChannel* AudioOutputDevice::Channel(uint ChannelIndex) {
42			return (ChannelIndex < Channels.size()) ? Channels[ChannelIndex] : NULL;
43			}
44
45			int AudioOutputDevice::RenderAudio(uint Samples) {
46			if (Channels.empty()) return 0;
47
48			// reset all channels with silence
49			{
50			std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
51			std::vector<AudioChannel*>::iterator end = Channels.end();
52			for (; iterChannels != end; iterChannels++)
53			(*iterChannels)->Clear(); // zero out audio buffer
54			}
55
56			int result = 0;
57
58			// let all connected engines render audio for the current audio fragment cycle
59			{
60			std::set<Engine*>::iterator iterEngine = Engines.begin();
61			std::set<Engine*>::iterator end = Engines.end();
62			for (; iterEngine != end; iterEngine++) {
63			int res = (*iterEngine)->RenderAudio(Samples);
64			if (res != 0) result = res;
65			}
66			}
67
68			return result;
69			}
70
71			int AudioOutputDevice::RenderSilence(uint Samples) {
72			if (Channels.empty()) return 0;
73
74			// reset all channels with silence
75			{
76			std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
77			std::vector<AudioChannel*>::iterator end = Channels.end();
78			for (; iterChannels != end; iterChannels++)
79			(*iterChannels)->Clear(); // zero out audio buffer
80			}
81
82			return 0;
83			}
84
85			} // namespace LinuxSampler