mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-11 01:06:01 +03:00
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++
/*
|
|
* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Concepts.h>
|
|
#include <AK/Types.h>
|
|
#include <AK/Vector.h>
|
|
|
|
namespace Audio {
|
|
|
|
// Small helper to resample from one playback rate to another
|
|
// This isn't really "smart", in that we just insert (or drop) samples.
|
|
// Should do better...
|
|
template<typename SampleType>
|
|
class ResampleHelper {
|
|
public:
|
|
ResampleHelper(u32 source, u32 target)
|
|
: m_source(source)
|
|
, m_target(target)
|
|
{
|
|
VERIFY(source > 0);
|
|
VERIFY(target > 0);
|
|
}
|
|
|
|
// To be used as follows:
|
|
// while the resampler doesn't need a new sample, read_sample(current) and store the resulting samples.
|
|
// as long as the resampler needs a new sample, process_sample(current)
|
|
|
|
// Stores a new sample
|
|
void process_sample(SampleType sample_l, SampleType sample_r)
|
|
{
|
|
m_last_sample_l = sample_l;
|
|
m_last_sample_r = sample_r;
|
|
m_current_ratio += m_target;
|
|
}
|
|
|
|
// Assigns the given sample to its correct value and returns false if there is a new sample required
|
|
bool read_sample(SampleType& next_l, SampleType& next_r)
|
|
{
|
|
if (m_current_ratio >= m_source) {
|
|
m_current_ratio -= m_source;
|
|
next_l = m_last_sample_l;
|
|
next_r = m_last_sample_r;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
template<ArrayLike<SampleType> Samples>
|
|
ErrorOr<Vector<SampleType>> try_resample(Samples&& to_resample)
|
|
{
|
|
Vector<SampleType> resampled;
|
|
TRY(try_resample_into_end(resampled, forward<Samples>(to_resample)));
|
|
return resampled;
|
|
}
|
|
|
|
template<ArrayLike<SampleType> Samples, size_t vector_inline_capacity = 0>
|
|
ErrorOr<void> try_resample_into_end(Vector<SampleType, vector_inline_capacity>& destination, Samples&& to_resample)
|
|
{
|
|
float ratio = (m_source > m_target) ? static_cast<float>(m_source) / m_target : static_cast<float>(m_target) / m_source;
|
|
TRY(destination.try_ensure_capacity(destination.size() + to_resample.size() * ratio));
|
|
for (auto sample : to_resample) {
|
|
process_sample(sample, sample);
|
|
|
|
while (read_sample(sample, sample))
|
|
destination.unchecked_append(sample);
|
|
}
|
|
return {};
|
|
}
|
|
|
|
template<ArrayLike<SampleType> Samples>
|
|
Vector<SampleType> resample(Samples&& to_resample)
|
|
{
|
|
return MUST(try_resample(forward<Samples>(to_resample)));
|
|
}
|
|
|
|
void reset()
|
|
{
|
|
m_current_ratio = 0;
|
|
m_last_sample_l = {};
|
|
m_last_sample_r = {};
|
|
}
|
|
|
|
u32 source() const { return m_source; }
|
|
u32 target() const { return m_target; }
|
|
|
|
private:
|
|
const u32 m_source;
|
|
const u32 m_target;
|
|
u32 m_current_ratio { 0 };
|
|
SampleType m_last_sample_l {};
|
|
SampleType m_last_sample_r {};
|
|
};
|
|
|
|
}
|