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#ifndef AUDIOGRAPHER_NORMALIZER_H
#define AUDIOGRAPHER_NORMALIZER_H
#include "audiographer/sink.h"
#include "audiographer/routines.h"
#include "audiographer/utils/listed_source.h"
#include <cstring>
namespace AudioGrapher
{
/// A class for normalizing to a specified target in dB
class Normalizer
: public ListedSource<float>
, public Sink<float>
, public Throwing<>
{
public:
/// Constructs a normalizer with a specific target in dB \n RT safe
Normalizer (float target_dB)
: enabled (false)
, buffer (0)
, buffer_size (0)
{
target = pow (10.0f, target_dB * 0.05f);
}
~Normalizer()
{
delete [] buffer;
}
/// Sets the peak found in the material to be normalized \see PeakReader \n RT safe
void set_peak (float peak)
{
if (peak == 0.0f || peak == target) {
/* don't even try */
enabled = false;
} else {
enabled = true;
gain = target / peak;
}
}
/** Allocates a buffer for using with const ProcessContexts
* This function does not need to be called if
* non-const ProcessContexts are given to \a process() .
* \n Not RT safe
*/
void alloc_buffer(nframes_t frames)
{
delete [] buffer;
buffer = new float[frames];
buffer_size = frames;
}
/// Process a const ProcessContext \see alloc_buffer() \n RT safe
void process (ProcessContext<float> const & c)
{
if (throw_level (ThrowProcess) && c.frames() > buffer_size) {
throw Exception (*this, "Too many frames given to process()");
}
if (enabled) {
memcpy (buffer, c.data(), c.frames() * sizeof(float));
Routines::apply_gain_to_buffer (buffer, c.frames(), gain);
}
ProcessContext<float> c_out (c, buffer);
ListedSource<float>::output (c_out);
}
/// Process a non-const ProcsesContext in-place \n RT safe
void process (ProcessContext<float> & c)
{
if (enabled) {
Routines::apply_gain_to_buffer (c.data(), c.frames(), gain);
}
ListedSource<float>::output(c);
}
private:
bool enabled;
float target;
float gain;
float * buffer;
nframes_t buffer_size;
};
} // namespace
#endif // AUDIOGRAPHER_NORMALIZER_H
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