trunk/src/alsaio.h

/***************************************************************************
 *                                                                         *
 *   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                                                   *
 ***************************************************************************/

#ifndef __ALSAIO_H__
#define __ALSAIO_H__

#include <string.h>
#include <alsa/asoundlib.h>

#include "global.h"
#include "audioio.h"
#include "thread.h"
#include "audiothread.h"

class AlsaIO : public AudioIO, protected Thread {
    public:
        AlsaIO();
        int   Initialize(uint Channels, uint Samplerate, uint Fragments, uint FragmentSize);
        void  Activate();
        void  Close();
        void* GetInterleavedOutputBuffer();
        void* GetChannelOutputBufer(uint Channel);
    protected:
        int   Main();  ///< Implementation of virtual method from class Thread
    private:
        typedef std::string String;

        int16_t*             pOutputBuffer;     ///< This is the buffer where the final mix will be copied to and send to the sound card
        String               pcm_name;          ///< Name of the PCM device, like plughw:0,0 the first number is the number of the soundcard, the second number is the number of the device.
        snd_pcm_t*           pcm_handle;        ///< Handle for the PCM device
        snd_pcm_stream_t     stream;
        snd_pcm_hw_params_t* hwparams;          ///< This structure contains information about the hardware and can be used to specify the configuration to be used for the PCM stream.
        snd_pcm_sw_params_t* swparams;

        int  Output();
        bool HardwareParametersSupported(uint channels, int samplerate, uint numfragments, uint fragmentsize);
};

#endif // __ALSAIO_H__
1	/***************************************************************************
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	#ifndef __ALSAIO_H__
24	#define __ALSAIO_H__
25
26	#include <string.h>
27	#include <alsa/asoundlib.h>
28
29	#include "global.h"
30	#include "audioio.h"
31	#include "thread.h"
32	#include "audiothread.h"
33
34	class AlsaIO : public AudioIO, protected Thread {
35	public:
36	AlsaIO();
37	int Initialize(uint Channels, uint Samplerate, uint Fragments, uint FragmentSize);
38	void Activate();
39	void Close();
40	void* GetInterleavedOutputBuffer();
41	void* GetChannelOutputBufer(uint Channel);
42	protected:
43	int Main(); ///< Implementation of virtual method from class Thread
44	private:
45	typedef std::string String;
46
47	int16_t* pOutputBuffer; ///< This is the buffer where the final mix will be copied to and send to the sound card
48	String pcm_name; ///< Name of the PCM device, like plughw:0,0 the first number is the number of the soundcard, the second number is the number of the device.
49	snd_pcm_t* pcm_handle; ///< Handle for the PCM device
50	snd_pcm_stream_t stream;
51	snd_pcm_hw_params_t* hwparams; ///< This structure contains information about the hardware and can be used to specify the configuration to be used for the PCM stream.
52	snd_pcm_sw_params_t* swparams;
53
54	int Output();
55	bool HardwareParametersSupported(uint channels, int samplerate, uint numfragments, uint fragmentsize);
56	};
57
58	#endif // __ALSAIO_H__