60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cstddef>
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#include <memory>
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#include <vector>
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#include "common/common_types.h"
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namespace AudioCore {
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class TimeStretcher final {
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public:
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TimeStretcher();
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~TimeStretcher();
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/**
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* Set sample rate for the samples that Process returns.
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* @param sample_rate The sample rate.
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*/
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void SetOutputSampleRate(unsigned int sample_rate);
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/**
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* Add samples to be processed.
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* @param sample_buffer Buffer of samples in interleaved stereo PCM16 format.
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* @param num_sample Number of samples.
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*/
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void AddSamples(const s16* sample_buffer, size_t num_samples);
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/// Flush audio remaining in internal buffers.
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void Flush();
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/// Resets internal state and clears buffers.
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void Reset();
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/**
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* Does audio stretching and produces the time-stretched samples.
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* Timer calculations use sample_delay to determine how much of a margin we have.
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* @param sample_delay How many samples are buffered downstream of this module and haven't been
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* played yet.
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* @return Samples to play in interleaved stereo PCM16 format.
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*/
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std::vector<s16> Process(size_t sample_delay);
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private:
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struct Impl;
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std::unique_ptr<Impl> impl;
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/// INTERNAL: ratio = wallclock time / emulated time
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double CalculateCurrentRatio();
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/// INTERNAL: If we have too many or too few samples downstream, nudge ratio in the appropriate
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/// direction.
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double CorrectForUnderAndOverflow(double ratio, size_t sample_delay) const;
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/// INTERNAL: Gets the time-stretched samples from SoundTouch.
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std::vector<s16> GetSamples();
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};
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} // namespace AudioCore
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