You've already forked libopenshot
mirror of
https://github.com/OpenShot/libopenshot.git
synced 2026-03-02 08:53:52 -08:00
59108504e3
- Replace all juce::CriticalSection with std::recursive_mutex - Replace all juce::AudioSampleBuffer with juce::AudioBuffer<float> - Eliminate implicit reliance on 'using namespace juce;' - Replace OpenShotAudio.h includes with targeted juce modules
113 lines
3.2 KiB
C++
113 lines
3.2 KiB
C++
/**
|
|
* @file
|
|
* @brief Source file for AudioResampler class
|
|
* @author Jonathan Thomas <jonathan@openshot.org>
|
|
*
|
|
* @ref License
|
|
*/
|
|
|
|
// Copyright (c) 2008-2019 OpenShot Studios, LLC
|
|
//
|
|
// SPDX-License-Identifier: LGPL-3.0-or-later
|
|
|
|
#include "AudioResampler.h"
|
|
|
|
using namespace std;
|
|
using namespace openshot;
|
|
|
|
// Default constructor, max frames to cache is 20 // resample_source(NULL), buffer_source(NULL), num_of_samples(0), new_num_of_samples(0), dest_ratio(0), source_ratio(0), resampled_buffer(NULL), isPrepared(false)
|
|
AudioResampler::AudioResampler()
|
|
{
|
|
resample_source = NULL;
|
|
buffer_source = NULL;
|
|
num_of_samples = 0;
|
|
new_num_of_samples = 0;
|
|
dest_ratio = 0;
|
|
source_ratio = 0;
|
|
resampled_buffer = NULL;
|
|
isPrepared = false;
|
|
|
|
// Init buffer source
|
|
buffer_source = new AudioBufferSource(buffer);
|
|
|
|
// Init resampling source
|
|
resample_source = new juce::ResamplingAudioSource(buffer_source, false, 2);
|
|
|
|
// Init resampled buffer
|
|
resampled_buffer = new juce::AudioBuffer<float>(2, 1);
|
|
resampled_buffer->clear();
|
|
|
|
// Init callback buffer
|
|
resample_callback_buffer.buffer = resampled_buffer;
|
|
resample_callback_buffer.numSamples = 1;
|
|
resample_callback_buffer.startSample = 0;
|
|
}
|
|
|
|
// Descructor
|
|
AudioResampler::~AudioResampler()
|
|
{
|
|
// Clean up
|
|
if (buffer_source)
|
|
delete buffer_source;
|
|
if (resample_source)
|
|
delete resample_source;
|
|
if (resampled_buffer)
|
|
delete resampled_buffer;
|
|
}
|
|
|
|
// Sets the audio buffer and updates the key settings
|
|
void AudioResampler::SetBuffer(juce::AudioBuffer<float> *new_buffer, double sample_rate, double new_sample_rate)
|
|
{
|
|
if (sample_rate <= 0)
|
|
sample_rate = 44100;
|
|
if (new_sample_rate <= 0)
|
|
new_sample_rate = 44100;
|
|
|
|
// Set the sample ratio (the ratio of sample rate change)
|
|
source_ratio = sample_rate / new_sample_rate;
|
|
|
|
// Call SetBuffer with ratio
|
|
SetBuffer(new_buffer, source_ratio);
|
|
}
|
|
|
|
// Sets the audio buffer and key settings
|
|
void AudioResampler::SetBuffer(juce::AudioBuffer<float> *new_buffer, double ratio)
|
|
{
|
|
// Update buffer & buffer source
|
|
buffer = new_buffer;
|
|
buffer_source->setBuffer(buffer);
|
|
|
|
// Set the sample ratio (the ratio of sample rate change)
|
|
source_ratio = ratio;
|
|
dest_ratio = 1.0 / ratio;
|
|
num_of_samples = buffer->getNumSamples();
|
|
new_num_of_samples = round(num_of_samples * dest_ratio) - 1;
|
|
|
|
// Set resample ratio
|
|
resample_source->setResamplingRatio(source_ratio);
|
|
|
|
// Prepare to play resample source
|
|
if (!isPrepared)
|
|
{
|
|
// Prepare to play the audio sources (and set the # of samples per chunk to a little more than expected)
|
|
resample_source->prepareToPlay(num_of_samples + 10, 0);
|
|
isPrepared = true;
|
|
}
|
|
|
|
// Resize buffer for the newly resampled data
|
|
resampled_buffer->setSize(buffer->getNumChannels(), new_num_of_samples, true, true, true);
|
|
resample_callback_buffer.numSamples = new_num_of_samples;
|
|
resample_callback_buffer.startSample = 0;
|
|
resample_callback_buffer.clearActiveBufferRegion();
|
|
}
|
|
|
|
// Get the resampled audio buffer
|
|
juce::AudioBuffer<float>* AudioResampler::GetResampledBuffer()
|
|
{
|
|
// Resample the current frame's audio buffer (into the temp callback buffer)
|
|
resample_source->getNextAudioBlock(resample_callback_buffer);
|
|
|
|
// Return buffer pointer to this newly resampled buffer
|
|
return resampled_buffer;
|
|
}
|