bool V4LRadioControl::initRadio()
{
v4l2_tuner tuner;
v4l2_input input;
v4l2_frequency freq;
v4l2_capability cap;
low = false;
available = false;
freqMin = freqMax = currentFreq = 0;
fd = ::open("/dev/radio0", O_RDWR);
if(fd != -1) {
// Capabilities
memset( &cap, 0, sizeof( cap ) );
if(::ioctl(fd, VIDIOC_QUERYCAP, &cap ) >= 0) {
if(((cap.capabilities & V4L2_CAP_RADIO) == 0) && ((cap.capabilities & V4L2_CAP_AUDIO) == 0))
available = true;
}
// Tuners
memset( &input, 0, sizeof( input ) );
tuners = 0;
for ( ;; ) {
memset( &input, 0, sizeof( input ) );
input.index = tuners;
if ( ioctl( fd, VIDIOC_ENUMINPUT, &input ) < 0 )
break;
++tuners;
}
// Freq bands
for ( int index = 0; index < tuners; ++index ) {
memset( &tuner, 0, sizeof( tuner ) );
tuner.index = index;
if ( ioctl( fd, VIDIOC_G_TUNER, &tuner ) < 0 )
continue;
if ( tuner.type != V4L2_TUNER_RADIO )
continue;
if ( ( tuner.capability & V4L2_TUNER_CAP_LOW ) != 0 ) {
// Units are 1/16th of a kHz.
low = true;
}
if(low) {
freqMin = tuner.rangelow * 62.5;
freqMax = tuner.rangehigh * 62.5;
} else {
freqMin = tuner.rangelow * 62500;
freqMax = tuner.rangehigh * 62500;
}
}
// frequency
memset( &freq, 0, sizeof( freq ) );
if(::ioctl(fd, VIDIOC_G_FREQUENCY, &freq ) >= 0) {
if ( ((int)freq.frequency) != -1 ) { // -1 means not set.
if(low)
currentFreq = freq.frequency * 62.5;
else
currentFreq = freq.frequency * 62500;
}
}
// stereo
bool stereo = false;
memset( &tuner, 0, sizeof( tuner ) );
if ( ioctl( fd, VIDIOC_G_TUNER, &tuner ) >= 0 ) {
if((tuner.rxsubchans & V4L2_TUNER_SUB_STEREO) != 0)
stereo = true;
}
vol = getVol();
return true;
}
m_error = true;
emit error();
return false;
}
/* 重さを計算 */
double getWeight(double r, double t,double g)
{
return g * getVol(r,t);
}
