void DrawnWaveform::
updateMaxValue(Signal::pMonoBuffer b)
{
float *p = b->waveform_data()->getCpuMemory();
float maxValue=0;
Signal::IntervalType N = b->number_of_samples();
for(Signal::IntervalType i=0; i<N; ++i)
maxValue = std::max(std::abs(p[i]), maxValue);
maxValue *= 1.1;
this->maxValue = std::max(this->maxValue, maxValue);
}
pChunk DummyTransform::
operator()( Signal::pMonoBuffer b )
{
// This is the dummy part.
DummyChunk*p;
pChunk c(p = new DummyChunk);
p->original = b;
c->chunk_offset = b->sample_offset ();
c->first_valid_sample = 0;
c->n_valid_samples = (int)b->number_of_samples ();
c->original_sample_rate = b->sample_rate ();
c->sample_rate = b->sample_rate ();
c->transform_data.reset (new Tfr::ChunkData(b->waveform_data ()->size ()));
return c;
}
pChunk DrawnWaveform::
operator()( Signal::pMonoBuffer b )
{
float blobsize = blob(b->sample_rate());
unsigned w = ((unsigned)(b->number_of_samples() / blobsize / drawWaveform_BLOCK_SIZE)) *drawWaveform_BLOCK_SIZE;
if (0 == w)
throw std::logic_error("DrawnWaveform::operator() Not enough data");
size_t free = availableMemoryForSingleAllocation();
free /= 2; // Don't even try to get close to use all memory
// never use more than 64 MB
if (free > 64<<20)
free = 64<<20;
unsigned wmax = free/(drawWaveform_YRESOLUTION*sizeof(Tfr::ChunkElement)*drawWaveform_BLOCK_SIZE ) * drawWaveform_BLOCK_SIZE;
if (0==wmax)
wmax = free/(drawWaveform_YRESOLUTION*sizeof(Tfr::ChunkElement));
if (0==wmax)
wmax = 1;
if (wmax < w)
w = wmax;
updateMaxValue(b);
pChunk c(new DrawnWaveformChunk(this->block_fs));
c->transform_data.reset( new ChunkData(w, drawWaveform_YRESOLUTION, 1));
unsigned readstop = b->number_of_samples();
if (b->getInterval().last > signal_length)
{
if (b->getInterval().first > signal_length)
readstop = 0;
else
readstop = signal_length - b->getInterval().first;
}
float writeposoffs = ((b->sample_offset() / blobsize) - floorf((b->sample_offset() / blobsize).asFloat())).asFloat();
::drawWaveform(
b->waveform_data(),
c->transform_data,
blobsize,
readstop,
maxValue,
writeposoffs);
this->block_fs = 0;
c->chunk_offset = b->sample_offset() / blobsize + writeposoffs;
c->freqAxis = freqAxis( b->sample_rate() );
c->first_valid_sample = 0;
c->n_valid_samples = c->nSamples();
c->original_sample_rate = b->sample_rate();
c->sample_rate = b->sample_rate() / blobsize;
return c;
}