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Number of taps can be specified explicitly if you desire.

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This commit is contained in:
Thomas Harte 2016-04-17 20:45:57 -04:00
parent 499f7ace07
commit 5980f5e991
1 changed files with 18 additions and 11 deletions
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23
Outputs/Speaker.hpp
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@ -35,11 +35,11 @@ class Speaker {
set_needs_updated_filter_coefficients(); set_needs_updated_filter_coefficients();
} }
// void set_output_quality(int number_of_taps) void set_output_quality(int number_of_taps)
// { {
// _number_of_taps = number_of_taps; _requested_number_of_taps = number_of_taps;
// set_needs_updated_filter_coefficients(); set_needs_updated_filter_coefficients();
// } }
void set_delegate(Delegate *delegate) void set_delegate(Delegate *delegate)
{ {
@ -52,13 +52,13 @@ class Speaker {
set_needs_updated_filter_coefficients(); set_needs_updated_filter_coefficients();
} }
Speaker() : _buffer_in_progress_pointer(0) {} Speaker() : _buffer_in_progress_pointer(0), _requested_number_of_taps(0) {}
protected: protected:
std::unique_ptr<int16_t> _buffer_in_progress; std::unique_ptr<int16_t> _buffer_in_progress;
int _buffer_size; int _buffer_size;
int _buffer_in_progress_pointer; int _buffer_in_progress_pointer;
int _number_of_taps; int _number_of_taps, _requested_number_of_taps;
bool _coefficients_are_dirty; bool _coefficients_are_dirty;
Delegate *_delegate; Delegate *_delegate;
@ -130,10 +130,17 @@ template <class T> class Filter: public Speaker {
void update_filter_coefficients() void update_filter_coefficients()
{ {
// make a guess at a good number of taps // make a guess at a good number of taps if this hasn't been provided explicitly
if(_requested_number_of_taps)
{
_number_of_taps = _requested_number_of_taps;
}
else
{
_number_of_taps = (_input_cycles_per_second + _output_cycles_per_second) / _output_cycles_per_second; _number_of_taps = (_input_cycles_per_second + _output_cycles_per_second) / _output_cycles_per_second;
_number_of_taps *= 2; _number_of_taps *= 2;
_number_of_taps |= 1; _number_of_taps |= 1;
}
_coefficients_are_dirty = false; _coefficients_are_dirty = false;
_buffer_in_progress_pointer = 0; _buffer_in_progress_pointer = 0;