void
liveScanner (dsd_opts * opts, dsd_state * state)
{
if (opts->audio_in_fd == -1)
{
if (pthread_mutex_lock(&state->input_mutex))
{
printf("liveScanner -> Unable to lock mutex\n");
}
}
while (1)
{
noCarrier (opts, state);
state->synctype = getFrameSync (opts, state);
// recalibrate center/umid/lmid
state->center = ((state->max) + (state->min)) / 2;
state->umid = (((state->max) - state->center) * 5 / 8) + state->center;
state->lmid = (((state->min) - state->center) * 5 / 8) + state->center;
while (state->synctype != -1)
{
processFrame (opts, state);
state->synctype = getFrameSync (opts, state);
// recalibrate center/umid/lmid
state->center = ((state->max) + (state->min)) / 2;
state->umid = (((state->max) - state->center) * 5 / 8) + state->center;
state->lmid = (((state->min) - state->center) * 5 / 8) + state->center;
}
}
}
// This function is a supplement to the loadHeader
// function, the only purpose is to detect if the
// header loaded by loadHeader is a valid header
// or just four different chars
BOOL CFrameHeader::isValidHeader() {
return ( ((getFrameSync() & 2047)==2047) &&
((getVersionIndex() & 3)!= 1) &&
((getLayerIndex() & 3)!= 0) &&
((getBitrateIndex() & 15)!= 0) && // due to lack of support of the .mp3 format
// no "public" .mp3's should contain information
// like this anyway... :)
((getBitrateIndex() & 15)!= 15) &&
((getFrequencyIndex() & 3)!= 3) &&
((getEmphasisIndex() & 3)!= 2) );
}
