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//=============================================================================
// MuseScore
// Linux Music Score Editor
// $Id: alsa.h 5660 2012-05-22 14:17:39Z wschweer $
//
// Copyright (C) 2002-2009 Werner Schweer and others
//
// AlsaDriver based on code from Fons Adriaensen (clalsadr.cc)
// Copyright (C) 2003 Fons Adriaensen
// partly based on original work from Paul Davis
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2.
//
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
//=============================================================================

#ifndef __ALSA_H__
#define __ALSA_H

#include "driver.h"
#include "mididriver.h"
#include "config.h"

#define ALSA_PCM_NEW_HW_PARAMS_API
#define ALSA_PCM_NEW_SW_PARAMS_API

class MidiDriver;

#include <alsa/asoundlib.h>

//---------------------------------------------------------
// AlsaDriver
//---------------------------------------------------------

class AlsaDriver {
      QString _name;
      typedef char* (*play_function)(const float*, char*, int, int);
      typedef char* (*clear_function)(char*, int, int);

      enum { MAXPFD = 8, MAXPLAY = 4 };

      int setHwpar(snd_pcm_t* handle, snd_pcm_hw_params_t* hwpar);
      int setSwpar(snd_pcm_t* handle, snd_pcm_sw_params_t* swpar);
      int recover();

      unsigned int _rate;
      snd_pcm_uframes_t _frsize;
      unsigned int _nfrags;
      snd_pcm_format_t _play_format;
      snd_pcm_access_t _play_access;
      snd_pcm_t* _play_handle;
      snd_pcm_hw_params_t* _play_hwpar;
      snd_pcm_sw_params_t* _play_swpar;
      unsigned int _play_nchan;
      int _play_npfd;
      struct pollfd _pfd [MAXPFD];
      snd_pcm_uframes_t _capt_offs;
      snd_pcm_uframes_t _play_offs;
      int _play_step;
      char* _play_ptr [MAXPLAY];
      int _stat;
      int _pcnt;
      bool _xrun;
      clear_function _clear_func;
      play_function _play_func;
      bool mmappedInterface;

      static char* clear_32le(char* dst, int step, int nfrm);
      static char* clear_24le(char* dst, int step, int nfrm);
      static char* clear_16le(char* dst, int step, int nfrm);
      static char* play_32le(const float* src, char* dst, int step, int nfrm);
      static char* play_24le(const float* src, char* dst, int step, int nfrm);
      static char* play_16le(const float* src, char* dst, int step, int nfrm);
      int playInit(snd_pcm_uframes_t len);
      snd_pcm_sframes_t pcmWait();
      snd_pcm_t* playHandle() const { return _play_handle; }
      void clearChan(int chan, snd_pcm_uframes_t len) {
            _play_ptr[chan] = _clear_func(_play_ptr[chan], _play_step, len);
            }

    public:
      AlsaDriver(QString, unsigned, snd_pcm_uframes_t, unsigned);
      ~AlsaDriver();
      bool init();
      void printinfo();
      bool pcmStart();
      int pcmStop();
      snd_pcm_uframes_t fsize() const { return _frsize; }
      unsigned int sampleRate() const { return _rate; }
      void write(int n, float* l, float* r);
      };

//---------------------------------------------------------
// AlsaAudio
//---------------------------------------------------------

class AlsaAudio : public Driver {
      pthread_t thread;
      AlsaDriver* alsa;
      volatile int runAlsa;
      int state;
      bool seekflag;

      MidiDriver* midiDriver;

      void registerClient();

   public:
      AlsaAudio(Seq*);
      virtual ~AlsaAudio();
      virtual bool init();
      virtual QList<QString> inputPorts();
      virtual bool start();
      virtual bool stop();
      void connect(void*, void*) {}
      void disconnect(void* src, void* dst);
      float* getLBuffer(long n);
      float* getRBuffer(long n);
      virtual bool isRealtime() const { return false; }
      virtual void startTransport();
      virtual void stopTransport();
      virtual int getState();
      virtual int sampleRate() const;
      void alsaLoop();
      void write(int n, void* l);

      virtual void midiRead();

      virtual void registerPort(const QString& name, bool input, bool midi);
      virtual void unregisterPort(int);
      };

#endif
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