src/audiodriver/AudioOutputDevice.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 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 {

    AudioOutputDevice::AudioOutputDevice(type_t Type) {
        AudioOutputType = Type;
    }

    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;
    }

    AudioOutputDevice::type_t AudioOutputDevice::Type() {
        return AudioOutputType;
    }

} // namespace LinuxSampler
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 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	AudioOutputDevice::AudioOutputDevice(type_t Type) {
28	AudioOutputType = Type;
29	}
30
31	void AudioOutputDevice::Connect(Engine* pEngine) {
32	if (Engines.find(pEngine) == Engines.end()) {
33	pEngine->Connect(this);
34	Engines.insert(pEngine);
35	}
36	}
37
38	void AudioOutputDevice::Disconnect(Engine* pEngine) {
39	if (Engines.find(pEngine) != Engines.end()) { // if clause to prevent disconnect loop
40	Engines.erase(pEngine);
41	pEngine->DisconnectAudioOutputDevice();
42	}
43	}
44
45	AudioChannel* AudioOutputDevice::Channel(uint ChannelIndex) {
46	return (ChannelIndex < Channels.size()) ? Channels[ChannelIndex] : NULL;
47	}
48
49	int AudioOutputDevice::RenderAudio(uint Samples) {
50	if (Channels.empty()) return 0;
51
52	// reset all channels with silence
53	{
54	std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
55	std::vector<AudioChannel*>::iterator end = Channels.end();
56	for (; iterChannels != end; iterChannels++)
57	(*iterChannels)->Clear(); // zero out audio buffer
58	}
59
60	int result = 0;
61
62	// let all connected engines render audio for the current audio fragment cycle
63	{
64	std::set<Engine*>::iterator iterEngine = Engines.begin();
65	std::set<Engine*>::iterator end = Engines.end();
66	for (; iterEngine != end; iterEngine++) {
67	int res = (*iterEngine)->RenderAudio(Samples);
68	if (res != 0) result = res;
69	}
70	}
71
72	return result;
73	}
74
75	int AudioOutputDevice::RenderSilence(uint Samples) {
76	if (Channels.empty()) return 0;
77
78	// reset all channels with silence
79	{
80	std::vector<AudioChannel*>::iterator iterChannels = Channels.begin();
81	std::vector<AudioChannel*>::iterator end = Channels.end();
82	for (; iterChannels != end; iterChannels++)
83	(*iterChannels)->Clear(); // zero out audio buffer
84	}
85
86	return 0;
87	}
88
89	AudioOutputDevice::type_t AudioOutputDevice::Type() {
90	return AudioOutputType;
91	}
92
93	} // namespace LinuxSampler