mipalsaoutput.h

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/*
    
  This file is a part of EMIPLIB, the EDM Media over IP Library.
  
  Copyright (C) 2006-2011  Hasselt University - Expertise Centre for
                      Digital Media (EDM) (http://www.edm.uhasselt.be)

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  
  USA

*/

#ifndef MIPALSAOUTPUT_H

#define MIPALSAOUTPUT_H

#include "mipconfig.h"

#ifdef MIPCONFIG_SUPPORT_ALSA

#include "mipcomponent.h"
#include "miptime.h"
#include <asoundlib.h>
#include <jthread/jthread.h>
#include <string>

class EMIPLIB_IMPORTEXPORT MIPAlsaOutput : public MIPComponent, private jthread::JThread
{
public:
        MIPAlsaOutput();
        ~MIPAlsaOutput();

        bool open(int sampRate, int channels, const std::string device = std::string("plughw:0,0"), 
                  MIPTime blockTime = MIPTime(0.020), 
                  MIPTime arrayTime = MIPTime(10.0),
                  bool floatSamples = true);

        bool close();
        bool push(const MIPComponentChain &chain, int64_t iteration, MIPMessage *pMsg);
        bool pull(const MIPComponentChain &chain, int64_t iteration, MIPMessage **pMsg);
private:
        void *Thread();
        
        snd_pcm_t *m_pDevice;
        snd_pcm_hw_params_t *m_pHwParameters;
        int m_sampRate;
        int m_channels;
        float *m_pFrameArrayFloat;
        uint16_t *m_pFrameArrayInt;
        bool m_floatSamples;
        size_t m_frameArrayLength;
        size_t m_currentPos, m_nextPos;
        size_t m_blockLength, m_blockFrames;
        MIPTime m_delay;
        MIPTime m_distTime, m_blockTime;
        jthread::JMutex m_frameMutex, m_stopMutex;
        bool m_stopLoop;
};

#endif // MIPCONFIG_SUPPORT_ALSA

#endif // MIPALSAOUTPUT_H