audiostream.cpp

/*
 *  Copyright (C) 2008 Savoir-Faire Linux inc.
 *  Author: Emmanuel Milou <emmanuel.milou@savoirfairelinux.com>
 *
 *  This program 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 3 of the License, or
 *  (at your option) any later version.
 *                                                                              
 *  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.
 */

#include <audiostream.h>
#include "pulselayer.h"

static pa_channel_map channel_map ;


AudioStream::AudioStream( pa_context* context, int type, std::string desc, double vol UNUSED )
		: _audiostream(NULL), _streamType(type), _streamDescription(desc), flag(PA_STREAM_AUTO_TIMING_UPDATE), sample_spec(), _volume()
{ 
  sample_spec.format = PA_SAMPLE_S16LE; 
  sample_spec.rate = 44100; 
  sample_spec.channels = 1; 
  channel_map.channels = 1; 
  pa_cvolume_set( &_volume , 1 , PA_VOLUME_NORM ) ; // * vol / 100 ;
  
  _context = context;

  // connectStream();
} 

AudioStream::~AudioStream()
{ 
  disconnectStream();
}

bool
AudioStream::connectStream()
{
  ost::MutexLock guard(_mutex);

  if(!_audiostream)
    _audiostream = createStream( _context );

  return true;
}

bool
AudioStream::disconnectStream( void )
{ 
  ost::MutexLock guard(_mutex);

  _debug("Destroy audio streams\n");
  pa_stream_disconnect( _audiostream );
  pa_stream_unref( _audiostream );

  _audiostream = NULL;

  return true;
} 



void 
AudioStream::stream_state_callback( pa_stream* s, void* user_data UNUSED )
{
  
  
  _debug("AudioStream::stream_state_callback :: The state of the stream changed\n");
  assert(s);
  switch(pa_stream_get_state(s)){
    case PA_STREAM_CREATING:
      _debug("Stream is creating...\n");
      break;
    case PA_STREAM_TERMINATED:
      _debug("Stream is terminating...\n" );
      PulseLayer::streamState++;
      break;
    case PA_STREAM_READY:
 
     _debug("Stream successfully created, connected to %s\n", pa_stream_get_device_name( s ));
     // pa_stream_cork( s, 0, NULL, NULL);
      break;
    case PA_STREAM_UNCONNECTED:
      _debug("Stream unconnected\n");
      break;
    case PA_STREAM_FAILED:
    default:
      _debug("Stream error - Sink/Source doesn't exists: %s\n" , pa_strerror(pa_context_errno(pa_stream_get_context(s))));
      exit(0);
      break;
  }
}

pa_stream_state_t 
AudioStream::getStreamState(void) {

  ost::MutexLock guard(_mutex);
  return pa_stream_get_state(_audiostream);
}



  pa_stream*
AudioStream::createStream( pa_context* c )
{
  ost::MutexLock guard(_mutex);

  pa_stream* s;
  //pa_cvolume cv;

  assert(pa_sample_spec_valid(&sample_spec));
  assert(pa_channel_map_valid(&channel_map));

  pa_buffer_attr* attributes = (pa_buffer_attr*)malloc( sizeof(pa_buffer_attr) );
  if( !( s = pa_stream_new( c, _streamDescription.c_str() , &sample_spec, &channel_map ) ) ) 
    _debug("%s: pa_stream_new() failed : %s\n" , _streamDescription.c_str(), pa_strerror( pa_context_errno( c)));

  assert( s );

  if( _streamType == PLAYBACK_STREAM ){
    attributes->maxlength = 60000;
    attributes->tlength = 4096;
    attributes->prebuf = 4096;
    attributes->minreq = 940;
    attributes->fragsize = 4096;
    // pa_stream_connect_playback( s , NULL , attributes, PA_STREAM_INTERPOLATE_TIMING, &_volume, NULL);
    pa_stream_connect_playback( s , NULL , attributes, PA_STREAM_START_CORKED, &_volume, NULL);
  }
  else if( _streamType == CAPTURE_STREAM ){
    
    // attributes->maxlength = 66500;
    // attributes->fragsize = (uint32_t)-1;

    attributes->maxlength = 60000;
    attributes->tlength = 4096;
    attributes->prebuf = 4096;
    attributes->minreq = 940;
    attributes->fragsize = 4096;
 
    pa_stream_connect_record( s , NULL , attributes , PA_STREAM_START_CORKED );
    // pa_stream_connect_record( s , NULL , attributes , PA_STREAM_INTERPOLATE_TIMING );
  }
  else if( _streamType == UPLOAD_STREAM ){
    pa_stream_connect_upload( s , 1024  );
  }
  else{
    _debug( "Stream type unknown \n");
  }

  pa_stream_set_state_callback( s , stream_state_callback, NULL);
  
  free(attributes);

  return s;
}