70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
#ifndef AUDIOGRAPHER_ROUTINES_H
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#define AUDIOGRAPHER_ROUTINES_H
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#include "types.h"
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#include <cmath>
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namespace AudioGrapher
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{
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/// Allows overriding some routines with more efficient ones.
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class Routines
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{
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public:
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typedef uint32_t uint_type;
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typedef float (*compute_peak_t) (float const *, uint_type, float);
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typedef void (*apply_gain_to_buffer_t) (float *, uint_type, float);
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static void override_compute_peak (compute_peak_t func) { _compute_peak = func; }
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static void override_apply_gain_to_buffer (apply_gain_to_buffer_t func) { _apply_gain_to_buffer = func; }
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/** Computes peak in float buffer
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* \n RT safe
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* \param data buffer from which the peak is computed
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* \param frames length of the portion of \a buffer that is checked
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* \param current_peak current peak of buffer, if calculated in several passes
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* \return maximum of values in [\a data, \a data + \a frames) and \a current_peak
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*/
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static inline float compute_peak (float const * data, uint_type frames, float current_peak)
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{
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return (*_compute_peak) (data, frames, current_peak);
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}
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/** Applies constant gain to buffer
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* \n RT safe
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* \param data data to which the gain is applied
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* \param frames length of data
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* \param gain gain that is applied
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*/
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static inline void apply_gain_to_buffer (float * data, uint_type frames, float gain)
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{
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(*_apply_gain_to_buffer) (data, frames, gain);
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}
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private:
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static inline float default_compute_peak (float const * data, uint_type frames, float current_peak)
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{
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for (uint_type i = 0; i < frames; ++i) {
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float abs = std::fabs(data[i]);
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if (abs > current_peak) { current_peak = abs; }
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}
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return current_peak;
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}
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static inline void default_apply_gain_to_buffer (float * data, uint_type frames, float gain)
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{
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for (uint_type i = 0; i < frames; ++i) {
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data[i] *= gain;
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}
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}
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static compute_peak_t _compute_peak;
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static apply_gain_to_buffer_t _apply_gain_to_buffer;
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};
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} // namespace
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#endif // AUDIOGRAPHER_ROUTINES_H
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