/[svn]/linuxsampler/trunk/src/audiodriver/AudioOutputDeviceAlsa.h
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Contents of /linuxsampler/trunk/src/audiodriver/AudioOutputDeviceAlsa.h

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Revision 53 - (show annotations) (download) (as text)
Mon Apr 26 17:15:51 2004 UTC (19 years, 11 months ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 3759 byte(s)
* completely restructured source tree
* implemented multi channel support
* implemented instrument manager, which controls sharing of instruments
  between multiple sampler engines / sampler channels
* created abstract classes 'AudioOutputDevice' and 'MidiInputDevice' for
  convenient implementation of further audio output driver and MIDI input
  driver for LinuxSampler
* implemented following LSCP commands: 'SET CHANNEL MIDI INPUT TYPE',
  'LOAD ENGINE', 'GET CHANNELS', 'ADD CHANNEL', 'REMOVE CHANNEL',
  'SET CHANNEL AUDIO OUTPUT TYPE'
* temporarily removed all command line options
* LSCP server is now launched by default

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 __LS_AUDIOOUTPUTDEVICEALSA_H__
24 #define __LS_AUDIOOUTPUTDEVICEALSA_H__
25
26 #include <string.h>
27 #include <alsa/asoundlib.h>
28
29 #include "../common/global.h"
30 #include "../common/Thread.h"
31 #include "AudioOutputDevice.h"
32 #include "AudioChannel.h"
33
34 namespace LinuxSampler {
35
36 /** ALSA audio output driver
37 *
38 * Implements audio output to the Advanced Linux Sound Architecture (ALSA).
39 */
40 class AudioOutputDeviceAlsa : public AudioOutputDevice, protected Thread {
41 public:
42 AudioOutputDeviceAlsa(uint Channels = 2, uint Samplerate = 44100, uint Fragments = 3, uint FragmentSize = 512, String Card = "0,0");
43 ~AudioOutputDeviceAlsa();
44
45 // derived abstract methods from class 'AudioOutputDevice'
46 virtual void Play();
47 virtual bool IsPlaying();
48 virtual void Stop();
49 virtual void AcquireChannels(uint Channels);
50 virtual uint MaxSamplesPerCycle();
51 virtual uint SampleRate();
52 protected:
53 int Main(); ///< Implementation of virtual method from class Thread
54 private:
55 uint uiAlsaChannels;
56 uint uiSamplerate;
57 uint FragmentSize;
58 int16_t* pAlsaOutputBuffer; ///< This is the buffer where the final mix will be copied to and send to the sound card
59 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.
60 snd_pcm_t* pcm_handle; ///< Handle for the PCM device
61 snd_pcm_stream_t stream;
62 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.
63 snd_pcm_sw_params_t* swparams;
64
65 int Output();
66 bool HardwareParametersSupported(uint channels, int samplerate, uint numfragments, uint fragmentsize);
67 };
68 }
69
70 #endif // __LS_AUDIOOUTPUTDEVICEALSA_H__

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