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Sometimes avoid unnecessary zero-fills.

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This commit is contained in:
Thomas Harte 2024-02-12 14:33:55 -05:00
parent f14e45f93e
commit 507c3da927
1 changed files with 14 additions and 20 deletions
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34
Outputs/Speaker/Implementation/CompoundSource.hpp
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@ -49,23 +49,10 @@ template <typename... T> class CompoundSource:
private:
template <typename... S> class CompoundSourceHolder {
public:
template <Outputs::Speaker::Action action, bool output_stereo>
void apply_samples(std::size_t number_of_samples, typename SampleT<output_stereo>::type *target) {
// Default-construct all samples, to fill with silence.
Outputs::Speaker::fill<action>(target, target + number_of_samples, typename SampleT<output_stereo>::type());
}
void set_scaled_volume_range(int16_t, double *, double) {}
static constexpr std::size_t size() {
return 0;
}
static constexpr bool is_stereo = false;
double total_scale(double *) const {
return 0.0;
}
void set_scaled_volume_range(int16_t, double *, double) {}
static constexpr std::size_t size() { return 0; }
double total_scale(double *) const { return 0.0; }
};
template <typename S, typename... R> class CompoundSourceHolder<S, R...> {
@ -95,17 +82,24 @@ template <typename... T> class CompoundSource:
return;
}
// Get the rest of the output.
next_source_.template apply_samples<action, output_stereo>(number_of_samples, target);
constexpr bool is_final_source = sizeof...(R) == 0;
// Get the rest of the output, if any.
if constexpr (!is_final_source) {
next_source_.template apply_samples<action, output_stereo>(number_of_samples, target);
}
if(source_.is_zero_level()) {
// This component is currently outputting silence; therefore don't add anything to the output
// audio — just pass the call onward.
// audio. Zero fill only if this is the final source (as everything above will be additive).
if constexpr (is_final_source) {
Outputs::Speaker::fill<action>(target, target + number_of_samples, typename SampleT<output_stereo>::type());
}
return;
}
// Add in this component's output.
source_.template apply_samples<Action::Mix>(number_of_samples, target);
source_.template apply_samples<is_final_source ? Action::Store : Action::Mix>(number_of_samples, target);
}
void set_scaled_volume_range(int16_t range, double *volumes, double scale) {