pBuffer process(pBuffer b) override
{
Interval I = b->getInterval ();
Signal::IntervalType i = std::max(0ll, I.first);
FLAC__stream_decoder_seek_absolute(decoder, i);
while (true)
{
fmt->block->set_sample_offset (i);
*b |= *fmt->block;
i += fmt->last_blocksize;
if (i>=I.last)
break;
if (!FLAC__stream_decoder_process_single (decoder))
{
Log("flacfile: failed reading at %d") % i;
break;
}
}
// if reading before start, zeros
if (I.first < 0)
*b |= Buffer(Signal::Interval(I.first, 0), b->sample_rate (), b->number_of_channels ());
// if b extends EOF, zeros
if (i < I.last)
*b |= Buffer(Interval(i,I.last), b->sample_rate (), b->number_of_channels ());
return b;
}
pBuffer OperationSetSilent::Operation::
process (pBuffer b)
{
Signal::Interval i = section_ & b->getInterval ();
if (i) {
Buffer zero(i, b->sample_rate(), b->number_of_channels ());
*b |= zero;
}
return b;
}