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86995be111
Previously, trying to load a wav file in aplay or SoundPlayer with a sample rate less than 44100 would crash in an assertion failure trying to unchecked_append to a vector that was not resized properly.
101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/*
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* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Concepts.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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namespace Audio {
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// Small helper to resample from one playback rate to another
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// This isn't really "smart", in that we just insert (or drop) samples.
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// Should do better...
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template<typename SampleType>
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class ResampleHelper {
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public:
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ResampleHelper(u32 source, u32 target)
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: m_source(source)
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, m_target(target)
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{
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VERIFY(source > 0);
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VERIFY(target > 0);
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}
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// To be used as follows:
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// while the resampler doesn't need a new sample, read_sample(current) and store the resulting samples.
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// as long as the resampler needs a new sample, process_sample(current)
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// Stores a new sample
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void process_sample(SampleType sample_l, SampleType sample_r)
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{
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m_last_sample_l = sample_l;
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m_last_sample_r = sample_r;
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m_current_ratio += m_target;
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}
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// Assigns the given sample to its correct value and returns false if there is a new sample required
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bool read_sample(SampleType& next_l, SampleType& next_r)
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{
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if (m_current_ratio >= m_source) {
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m_current_ratio -= m_source;
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next_l = m_last_sample_l;
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next_r = m_last_sample_r;
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return true;
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}
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return false;
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}
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template<ArrayLike<SampleType> Samples>
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ErrorOr<Vector<SampleType>> try_resample(Samples&& to_resample)
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{
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Vector<SampleType> resampled;
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TRY(try_resample_into_end(resampled, forward<Samples>(to_resample)));
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return resampled;
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}
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template<ArrayLike<SampleType> Samples, size_t vector_inline_capacity = 0>
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ErrorOr<void> try_resample_into_end(Vector<SampleType, vector_inline_capacity>& destination, Samples&& to_resample)
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{
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float ratio = (m_source > m_target) ? static_cast<float>(m_source) / m_target : static_cast<float>(m_target) / m_source;
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TRY(destination.try_ensure_capacity(destination.size() + to_resample.size() * ratio));
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for (auto sample : to_resample) {
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process_sample(sample, sample);
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while (read_sample(sample, sample))
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destination.unchecked_append(sample);
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}
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return {};
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}
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template<ArrayLike<SampleType> Samples>
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Vector<SampleType> resample(Samples&& to_resample)
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{
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return MUST(try_resample(forward<Samples>(to_resample)));
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}
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void reset()
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{
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m_current_ratio = 0;
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m_last_sample_l = {};
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m_last_sample_r = {};
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}
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u32 source() const { return m_source; }
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u32 target() const { return m_target; }
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private:
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const u32 m_source;
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const u32 m_target;
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u32 m_current_ratio { 0 };
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SampleType m_last_sample_l {};
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SampleType m_last_sample_r {};
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};
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}
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