drivers/audio/AudioOutputDevicePlugin.h

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2008 - 2009 Andreas Persson                             *
 *                                                                         *
 *   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., 51 Franklin St, Fifth Floor, Boston,                *
 *   MA  02110-1301  USA                                                   *
 ***************************************************************************/

#ifndef LS_AUDIOOUTPUTDEVICEPLUGIN_H
#define LS_AUDIOOUTPUTDEVICEPLUGIN_H

#include "AudioOutputDevice.h"

namespace LinuxSampler {

    /** Plugin audio output driver
     *
     * Implements audio output when LinuxSampler is running as a
     * plugin.
     *
     * The plugin implementation is given access to the Render
     * function, which should be called to render audio.
     */
    class AudioOutputDevicePlugin : public AudioOutputDevice {
    public:
        AudioOutputDevicePlugin(std::map<String,DeviceCreationParameter*> Parameters);

        /**
         * Audio channel implementation for the plugin audio driver.
         */
        class AudioChannelPlugin : public AudioChannel {
        protected:
            AudioChannelPlugin(uint ChannelNr);

            friend class AudioOutputDevicePlugin;
        };

        /**
         * Device Parameter 'CHANNELS'
         */
        class ParameterChannelsPlugin : public ParameterChannels {
        public:
            ParameterChannelsPlugin() : ParameterChannels() { }
            ParameterChannelsPlugin(String s) : ParameterChannels(s) { }
            virtual bool Fix() { return true; }
            void ForceSetValue(int channels);
        };

        /**
         * Device Parameter 'FRAGMENTSIZE'
         *
         * Used to set the audio fragment size / period size.
         */
        class ParameterFragmentSize : public DeviceCreationParameterInt {
        public:
            ParameterFragmentSize();
            ParameterFragmentSize(String s) throw (Exception);
            String Description();
            bool Fix();
            bool Mandatory();
            std::map<String,DeviceCreationParameter*> DependsAsParameters();
            optional<int> DefaultAsInt(std::map<String,String> Parameters);
            optional<int> RangeMinAsInt(std::map<String,String> Parameters);
            optional<int> RangeMaxAsInt(std::map<String,String> Parameters);
            std::vector<int> PossibilitiesAsInt(std::map<String,String> Parameters);
            void OnSetValue(int i) throw (Exception);
            static String Name();
        };

        // derived abstract methods from class 'AudioOutputDevice'
        void Play();
        bool IsPlaying();
        void Stop();
        uint MaxSamplesPerCycle();
        uint SampleRate();
        String Driver();
        AudioChannel* CreateChannel(uint ChannelNr);
        bool isAutonomousDevice();
        static String Name();
        static String Version();
        static String Description();
        static bool isAutonomousDriver();

        /**
         * This should be called by the plugin implementation to let
         * the engines render audio. The buffers where the data is
         * rendered can be set with Channel(index)->getBuffer().
         *
         * @param Samples - number of sample points to be rendered
         * @returns 0 on success or the last error return code of one
         *          engine
         */
        int Render(uint Samples) { return RenderAudio(Samples); }

        void AddChannels(int newChannels);
        void RemoveChannel(AudioChannel* pChannel);

    private:
        uint uiSampleRate;
        uint uiMaxSamplesPerCycle;
    };
}

#endif
1	/***************************************************************************
2	* *
3	* Copyright (C) 2008 - 2009 Andreas Persson *
4	* *
5	* This program is free software; you can redistribute it and/or modify *
6	* it under the terms of the GNU General Public License as published by *
7	* the Free Software Foundation; either version 2 of the License, or *
8	* (at your option) any later version. *
9	* *
10	* This program is distributed in the hope that it will be useful, *
11	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13	* GNU General Public License for more details. *
14	* *
15	* You should have received a copy of the GNU General Public License *
16	* along with this program; if not, write to the Free Software *
17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
18	* MA 02110-1301 USA *
19	***************************************************************************/
20
21	#ifndef LS_AUDIOOUTPUTDEVICEPLUGIN_H
22	#define LS_AUDIOOUTPUTDEVICEPLUGIN_H
23
24	#include "AudioOutputDevice.h"
25
26	namespace LinuxSampler {
27
28	/** Plugin audio output driver
29	*
30	* Implements audio output when LinuxSampler is running as a
31	* plugin.
32	*
33	* The plugin implementation is given access to the Render
34	* function, which should be called to render audio.
35	*/
36	class AudioOutputDevicePlugin : public AudioOutputDevice {
37	public:
38	AudioOutputDevicePlugin(std::map<String,DeviceCreationParameter*> Parameters);
39
40	/**
41	* Audio channel implementation for the plugin audio driver.
42	*/
43	class AudioChannelPlugin : public AudioChannel {
44	protected:
45	AudioChannelPlugin(uint ChannelNr);
46
47	friend class AudioOutputDevicePlugin;
48	};
49
50	/**
51	* Device Parameter 'CHANNELS'
52	*/
53	class ParameterChannelsPlugin : public ParameterChannels {
54	public:
55	ParameterChannelsPlugin() : ParameterChannels() { }
56	ParameterChannelsPlugin(String s) : ParameterChannels(s) { }
57	virtual bool Fix() { return true; }
58	void ForceSetValue(int channels);
59	};
60
61	/**
62	* Device Parameter 'FRAGMENTSIZE'
63	*
64	* Used to set the audio fragment size / period size.
65	*/
66	class ParameterFragmentSize : public DeviceCreationParameterInt {
67	public:
68	ParameterFragmentSize();
69	ParameterFragmentSize(String s) throw (Exception);
70	String Description();
71	bool Fix();
72	bool Mandatory();
73	std::map<String,DeviceCreationParameter*> DependsAsParameters();
74	optional<int> DefaultAsInt(std::map<String,String> Parameters);
75	optional<int> RangeMinAsInt(std::map<String,String> Parameters);
76	optional<int> RangeMaxAsInt(std::map<String,String> Parameters);
77	std::vector<int> PossibilitiesAsInt(std::map<String,String> Parameters);
78	void OnSetValue(int i) throw (Exception);
79	static String Name();
80	};
81
82	// derived abstract methods from class 'AudioOutputDevice'
83	void Play();
84	bool IsPlaying();
85	void Stop();
86	uint MaxSamplesPerCycle();
87	uint SampleRate();
88	String Driver();
89	AudioChannel* CreateChannel(uint ChannelNr);
90	bool isAutonomousDevice();
91	static String Name();
92	static String Version();
93	static String Description();
94	static bool isAutonomousDriver();
95
96	/**
97	* This should be called by the plugin implementation to let
98	* the engines render audio. The buffers where the data is
99	* rendered can be set with Channel(index)->getBuffer().
100	*
101	* @param Samples - number of sample points to be rendered
102	* @returns 0 on success or the last error return code of one
103	* engine
104	*/
105	int Render(uint Samples) { return RenderAudio(Samples); }
106
107	void AddChannels(int newChannels);
108	void RemoveChannel(AudioChannel* pChannel);
109
110	private:
111	uint uiSampleRate;
112	uint uiMaxSamplesPerCycle;
113	};
114	}
115
116	#endif