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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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#ifndef __LS_AUDIOOUTPUTDEVICEALSA_H__ |
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#define __LS_AUDIOOUTPUTDEVICEALSA_H__ |
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#include <string.h> |
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#include <alsa/asoundlib.h> |
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#include "../common/global.h" |
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#include "../common/Thread.h" |
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#include "AudioOutputDevice.h" |
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#include "AudioChannel.h" |
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namespace LinuxSampler { |
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/** ALSA audio output driver |
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* |
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* Implements audio output to the Advanced Linux Sound Architecture (ALSA). |
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*/ |
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class AudioOutputDeviceAlsa : public AudioOutputDevice, protected Thread { |
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public: |
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AudioOutputDeviceAlsa(uint Channels = 2, uint Samplerate = 44100, uint Fragments = 3, uint FragmentSize = 512, String Card = "0,0"); |
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~AudioOutputDeviceAlsa(); |
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// derived abstract methods from class 'AudioOutputDevice' |
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virtual void Play(); |
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virtual bool IsPlaying(); |
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virtual void Stop(); |
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virtual void AcquireChannels(uint Channels); |
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virtual uint MaxSamplesPerCycle(); |
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virtual uint SampleRate(); |
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protected: |
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int Main(); ///< Implementation of virtual method from class Thread |
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private: |
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uint uiAlsaChannels; |
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uint uiSamplerate; |
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uint FragmentSize; |
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int16_t* pAlsaOutputBuffer; ///< This is the buffer where the final mix will be copied to and send to the sound card |
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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. |
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snd_pcm_t* pcm_handle; ///< Handle for the PCM device |
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snd_pcm_stream_t stream; |
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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. |
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snd_pcm_sw_params_t* swparams; |
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int Output(); |
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bool HardwareParametersSupported(uint channels, int samplerate, uint numfragments, uint fragmentsize); |
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}; |
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} |
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#endif // __LS_AUDIOOUTPUTDEVICEALSA_H__ |
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