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Adds is_silent to SampleSource plus shortcut processing to CompoundSource.

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This commit is contained in:
Thomas Harte 2018-01-06 18:50:26 -05:00
parent 772c320d5a
commit 3e1d8ea082
2 changed files with 22 additions and 9 deletions
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22
Outputs/Speaker/Implementation/CompoundSource.hpp
View File

@ -31,19 +31,22 @@ template <typename... T> class CompoundSource: public Outputs::Speaker::SampleSo
A CompoundSource adds together the sound generated by multiple individual SampleSources.
It's an instance of template metaprogramming; this is the recursive case.
*/
template <typename T, typename... R> class CompoundSource<T, R...>: public Outputs::Speaker::SampleSource {
template <typename T, typename... R> class CompoundSource<T, R...>:
public Outputs::Speaker::SampleSource {
public:
CompoundSource(T &source, R &...next) : source_(source), next_source_(next...) {}
void get_samples(std::size_t number_of_samples, std::int16_t *target) {
// This is an ugly solution: get whatever the next source supplies and add the local
// results to it, with the degenerate case performing a memset to supply an array of 0.
// TODO: do better. Might need some alteration of SampleSource.
int16_t next_samples[number_of_samples];
next_source_.get_samples(number_of_samples, next_samples);
source_.get_samples(number_of_samples, target);
while(number_of_samples--) {
target[number_of_samples] += next_samples[number_of_samples];
if(source_.is_silent()) {
source_.skip_samples(number_of_samples);
next_source_.get_samples(number_of_samples, target);
} else {
int16_t next_samples[number_of_samples];
next_source_.get_samples(number_of_samples, next_samples);
source_.get_samples(number_of_samples, target);
while(number_of_samples--) {
target[number_of_samples] += next_samples[number_of_samples];
}
}
}
@ -53,6 +56,7 @@ template <typename T, typename... R> class CompoundSource<T, R...>: public Outpu
}
private:
bool is_sleeping_ = false;
T &source_;
CompoundSource<R...> next_source_;
};

9
Outputs/Speaker/Implementation/SampleSource.hpp
View File

@ -37,6 +37,15 @@ class SampleSource {
std::int16_t scratch_pad[number_of_samples];
get_samples(number_of_samples, scratch_pad);
}
/*!
@returns @c true if it is trivially true that a call to get_samples would just
fill the target with zeroes; @c false if a call might return all zeroes or
might not.
*/
bool is_silent() {
return false;
}
};
}