Software.H

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/* Copyright 2000-2018 Matt Flax <flatmax@flatmax.org>
   This file is part of GTK+ IOStream class set

   GTK+ IOStream 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.

   GTK+ IOStream 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 have received a copy of the GNU General Public License
   along with GTK+ IOStream
*/
#ifndef SOFTWARE_H
#define SOFTWARE_H

#include <ALSA/ALSA.H>

namespace ALSA {
  class Software : public Hardware {
    snd_pcm_sw_params_t *sParams; 

  public:
    Software(void){
      sParams=NULL;
      snd_pcm_sw_params_malloc(&sParams);
      if (!sParams)
        assert("Couldn't malloc SW params");
    }

    virtual ~Software(void){
      if (sParams)
        snd_pcm_sw_params_free(sParams);
      sParams=NULL;
    }

    int getSWParams() {
      PCM_NOT_OPEN_CHECK(getPCM()) // check pcm is open
      return snd_pcm_sw_params_current(getPCM(), sParams);
    }

    int setSWParams() {
      PCM_NOT_OPEN_CHECK(getPCM()) // check pcm is open
      return snd_pcm_sw_params(getPCM(), sParams);
    }

    int setSWThreshold(snd_pcm_uframes_t thresh) {
      PCM_NOT_OPEN_CHECK(getPCM()) // check pcm is open
      return snd_pcm_sw_params_set_start_threshold(getPCM(), sParams, thresh);
    }

    int setAvailMin(snd_pcm_uframes_t cnt) {
      PCM_NOT_OPEN_CHECK(getPCM()) // check pcm is open
      return snd_pcm_sw_params_set_avail_min(getPCM(), sParams, cnt);
    }

    void *getAddress(const snd_pcm_channel_area_t *areas, snd_pcm_uframes_t offset) const {
      return (void*)((char*)(areas->addr)+(areas->first+offset*areas->step)/8);
    }

    template<typename SAMPLE_TYPE>
    int getChannelCount(const snd_pcm_channel_area_t *areas) const {
      return areas->step/sizeof(SAMPLE_TYPE)/8;;
    }

    int dumpSWParams(){
      int ret=0;
      if (!logEnabled())
        return ret;
      return snd_pcm_sw_params_dump(sParams, log);
    }

  };
}
#endif //SOFTWARE_H