trunk/src/audioio.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 __AUDIO_H__
#define __AUDIO_H__

// We only support Alsa at the moment

#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <alsa/asoundlib.h>
#include <sched.h>
#include <sys/mman.h>

#include "global.h"

class AudioIO {
    public:
        bool     Initialized;
        int16_t* pOutputBuffer;  ///< This is the buffer where the final mix will be copied to and send to the sound card
        uint     Channels;
        uint     Samplerate;
        uint     Fragments;
        uint     FragmentSize;   ///< in sample points

        AudioIO();
       ~AudioIO();
        int  Initialize(uint channels, uint samplerate, uint numfragments, uint fragmentsize);
        int  Output();
        void Close();
    private:
        typedef std::string  String;

        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;

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

#endif // __AUDIO_H__
1	schoenebeck	9	/***************************************************************************
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 __AUDIO_H__
24			#define __AUDIO_H__
25
26			// We only support Alsa at the moment
27
28	schoenebeck	13	#include <string>
29	schoenebeck	9	#include <stdio.h>
30			#include <stdlib.h>
31			#include <string.h>
32			#include <unistd.h>
33			#include <alsa/asoundlib.h>
34			#include <sched.h>
35			#include <sys/mman.h>
36
37	schoenebeck	13	#include "global.h"
38
39	schoenebeck	9	class AudioIO {
40			public:
41	schoenebeck	13	bool Initialized;
42			int16_t* pOutputBuffer; ///< This is the buffer where the final mix will be copied to and send to the sound card
43	schoenebeck	9	uint Channels;
44			uint Samplerate;
45			uint Fragments;
46	schoenebeck	13	uint FragmentSize; ///< in sample points
47	schoenebeck	9
48			AudioIO();
49			~AudioIO();
50			int Initialize(uint channels, uint samplerate, uint numfragments, uint fragmentsize);
51			int Output();
52			void Close();
53			private:
54	schoenebeck	13	typedef std::string String;
55
56			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.
57			snd_pcm_t* pcm_handle; ///< Handle for the PCM device
58			snd_pcm_stream_t stream;
59			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.
60			snd_pcm_sw_params_t* swparams;
61
62			bool HardwareParametersSupported(uint channels, int samplerate, uint numfragments, uint fragmentsize);
63	schoenebeck	9	};
64
65			#endif // __AUDIO_H__