C++ (Cpp) AudioFormat::channeltype Examples

Example #1

File: ap_pulse.cpp Project: gogglesmm/gogglesmm

FXbool PulseOutput::configure(const AudioFormat & fmt){
  const pa_sample_spec * config=nullptr;
  pa_operation *operation=nullptr;

  if (!open())
    return false;

  if (stream && fmt==af)
    return true;

  if (stream) {
    pa_stream_disconnect(stream);
    pa_stream_unref(stream);
    stream=nullptr;
    }

  pa_sample_spec spec;
  pa_channel_map cmap;

  if (!to_pulse_format(fmt,spec.format))
    goto failed;

  spec.rate     = fmt.rate;
  spec.channels = fmt.channels;


  // setup channel map
  pa_channel_map_init(&cmap);
  cmap.channels = fmt.channels;
  for (FXint i=0;i<fmt.channels;i++) {
    switch(fmt.channeltype(i)) {
      case Channel::None        : cmap.map[i] = PA_CHANNEL_POSITION_INVALID;      break;
      case Channel::Mono        : cmap.map[i] = PA_CHANNEL_POSITION_MONO;         break;
      case Channel::FrontLeft   : cmap.map[i] = PA_CHANNEL_POSITION_FRONT_LEFT;   break;
      case Channel::FrontRight  : cmap.map[i] = PA_CHANNEL_POSITION_FRONT_RIGHT;  break;
      case Channel::FrontCenter : cmap.map[i] = PA_CHANNEL_POSITION_FRONT_CENTER; break;
      case Channel::BackLeft    : cmap.map[i] = PA_CHANNEL_POSITION_REAR_LEFT;    break;
      case Channel::BackRight   : cmap.map[i] = PA_CHANNEL_POSITION_REAR_RIGHT;   break;
      case Channel::BackCenter  : cmap.map[i] = PA_CHANNEL_POSITION_REAR_CENTER;  break;
      case Channel::SideLeft    : cmap.map[i] = PA_CHANNEL_POSITION_SIDE_LEFT;    break;
      case Channel::SideRight   : cmap.map[i] = PA_CHANNEL_POSITION_SIDE_RIGHT;   break;
      case Channel::LFE         : cmap.map[i] = PA_CHANNEL_POSITION_LFE;          break;
      default: goto failed;
      }
    }

  stream = pa_stream_new(pulse_context,"Goggles Music Manager",&spec,&cmap);
  if (stream == nullptr)
    goto failed;

#ifdef DEBUG
  pa_stream_set_state_callback(stream,stream_state_callback,this);
#endif
  //pa_stream_set_write_callback(stream,stream_write_callback,this);

  if (pa_stream_connect_playback(stream,nullptr,nullptr,PA_STREAM_NOFLAGS,nullptr,nullptr)<0)
    goto failed;

  /// Wait until stream is ready
  pa_stream_state_t state;
  while((state=pa_stream_get_state(stream))!=PA_STREAM_READY) {
    if (state==PA_STREAM_FAILED || state==PA_STREAM_TERMINATED){
      goto failed;
      }
    context->wait_plugin_events();
    }

  /// Get Actual Format
  config = pa_stream_get_sample_spec(stream);
  if (!to_gap_format(config->format,af))
    goto failed;
  af.channels=config->channels;
  af.rate=config->rate;
  af.channelmap=fmt.channelmap;

  /// Get Current Volume
  operation = pa_context_get_sink_input_info(pulse_context,pa_stream_get_index(stream),sink_info_callback,this);
  if (operation) pa_operation_unref(operation);

  return true;
failed:
  GM_DEBUG_PRINT("[pulse] Unsupported pulse configuration:\n");
  fmt.debug();
  return false;
  }