73192bc1a7
git-svn-id: svn://localhost/ardour2/branches/3.0@8166 d708f5d6-7413-0410-9779-e7cbd77b26cf
96 lines
2.1 KiB
C++
96 lines
2.1 KiB
C++
#ifndef AUDIOGRAPHER_NORMALIZER_H
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#define AUDIOGRAPHER_NORMALIZER_H
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#include "audiographer/sink.h"
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#include "audiographer/routines.h"
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#include "audiographer/utils/listed_source.h"
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#include <cstring>
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namespace AudioGrapher
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{
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/// A class for normalizing to a specified target in dB
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class Normalizer
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: public ListedSource<float>
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, public Sink<float>
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, public Throwing<>
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{
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public:
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/// Constructs a normalizer with a specific target in dB \n RT safe
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Normalizer (float target_dB)
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: enabled (false)
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, buffer (0)
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, buffer_size (0)
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{
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target = pow (10.0f, target_dB * 0.05f);
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}
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~Normalizer()
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{
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delete [] buffer;
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}
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/// Sets the peak found in the material to be normalized \see PeakReader \n RT safe
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void set_peak (float peak)
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{
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if (peak == 0.0f || peak == target) {
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/* don't even try */
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enabled = false;
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} else {
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enabled = true;
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gain = target / peak;
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}
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}
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/** Allocates a buffer for using with const ProcessContexts
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* This function does not need to be called if
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* non-const ProcessContexts are given to \a process() .
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* \n Not RT safe
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*/
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void alloc_buffer(framecnt_t frames)
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{
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delete [] buffer;
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buffer = new float[frames];
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buffer_size = frames;
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}
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/// Process a const ProcessContext \see alloc_buffer() \n RT safe
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void process (ProcessContext<float> const & c)
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{
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if (throw_level (ThrowProcess) && c.frames() > buffer_size) {
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throw Exception (*this, "Too many frames given to process()");
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}
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if (enabled) {
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memcpy (buffer, c.data(), c.frames() * sizeof(float));
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Routines::apply_gain_to_buffer (buffer, c.frames(), gain);
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}
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ProcessContext<float> c_out (c, buffer);
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ListedSource<float>::output (c_out);
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}
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/// Process a non-const ProcsesContext in-place \n RT safe
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void process (ProcessContext<float> & c)
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{
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if (enabled) {
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Routines::apply_gain_to_buffer (c.data(), c.frames(), gain);
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}
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ListedSource<float>::output(c);
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}
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private:
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bool enabled;
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float target;
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float gain;
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float * buffer;
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framecnt_t buffer_size;
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};
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} // namespace
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#endif // AUDIOGRAPHER_NORMALIZER_H
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