58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#include <psemek/audio/duplicate.hpp>
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#include <vector>
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namespace psemek::audio
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{
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namespace
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{
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struct duplicate_common
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{
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duplicate_common(stream_ptr stream)
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: stream(std::move(stream))
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{}
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stream_ptr stream;
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std::vector<float> buffer;
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std::size_t counter = 0;
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std::size_t read = 0;
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};
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struct duplicate_impl
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: stream
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{
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duplicate_impl(std::shared_ptr<duplicate_common> common)
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: common_(std::move(common))
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{}
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std::size_t read(float * data, std::size_t sample_count) override
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{
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if (counter_ == common_->counter)
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{
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++common_->counter;
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if (common_->buffer.size() < sample_count)
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common_->buffer.resize(sample_count);
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common_->read = common_->stream->read(common_->buffer.data(), sample_count);
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}
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std::copy(common_->buffer.data(), common_->buffer.data() + common_->read, data);
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++counter_;
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return common_->read;
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}
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private:
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std::shared_ptr<duplicate_common> common_;
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std::size_t counter_ = 0;
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};
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}
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std::pair<stream_ptr, stream_ptr> duplicate(stream_ptr stream)
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{
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auto common = std::make_shared<duplicate_common>(std::move(stream));
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return {std::make_shared<duplicate_impl>(common), std::make_shared<duplicate_impl>(common)};
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}
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}
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