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09ce05bbf2
- Added new Frame::ReverseAudio() helper method - for time keyframe support playing backwards audio - Fixed math rounding error on time keyframe Resampler, to use the rounded source samples value - Removed some unused args and Frame audio methods - Reset FrameMapper resample context when non-adjacent frames are requested - Correctly reverse Frame audio if a time keyframe is present, and reversing audio - Rewrite Keyframe::IsIncreasing() function, to give accurate direction of time keyframes at any index (special logic to support first and last indexes) - Fixed Keyframe unit tests - since logic has changed a bit - Improved time mapping unit tests - Replace many c-style casts with static_cast - Added new sine.wav test file
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/**
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* @file
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* @brief Source file for AudioResampler class
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* @author Jonathan Thomas <jonathan@openshot.org>
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*
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* @ref License
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*/
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// Copyright (c) 2008-2019 OpenShot Studios, LLC
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//
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// SPDX-License-Identifier: LGPL-3.0-or-later
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#include "AudioResampler.h"
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using namespace std;
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using namespace openshot;
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// 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)
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AudioResampler::AudioResampler(int numChannels)
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{
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buffer = NULL;
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resample_source = NULL;
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buffer_source = NULL;
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num_of_samples = 0;
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new_num_of_samples = 0;
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dest_ratio = 0;
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source_ratio = 0;
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resampled_buffer = NULL;
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isPrepared = false;
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// Init buffer source
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buffer_source = new AudioBufferSource(buffer);
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// Init resampling source
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resample_source = new juce::ResamplingAudioSource(buffer_source, false, numChannels);
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// Init resampled buffer
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resampled_buffer = new juce::AudioBuffer<float>(2, 1);
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resampled_buffer->clear();
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// Init callback buffer
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resample_callback_buffer.buffer = resampled_buffer;
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resample_callback_buffer.numSamples = 1;
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resample_callback_buffer.startSample = 0;
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}
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// Descructor
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AudioResampler::~AudioResampler()
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{
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// Clean up
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if (buffer_source)
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delete buffer_source;
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if (resample_source)
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delete resample_source;
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if (resampled_buffer)
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delete resampled_buffer;
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}
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// Sets the audio buffer and updates the key settings
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void AudioResampler::SetBuffer(juce::AudioBuffer<float> *new_buffer, double sample_rate, double new_sample_rate)
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{
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if (sample_rate <= 0)
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sample_rate = 44100;
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if (new_sample_rate <= 0)
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new_sample_rate = 44100;
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// Set the sample ratio (the ratio of sample rate change)
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source_ratio = sample_rate / new_sample_rate;
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// Call SetBuffer with ratio
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SetBuffer(new_buffer, source_ratio);
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}
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// Sets the audio buffer and key settings
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void AudioResampler::SetBuffer(juce::AudioBuffer<float> *new_buffer, double ratio)
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{
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// Update buffer & buffer source
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buffer = new_buffer;
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buffer_source->setBuffer(buffer);
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// Set the sample ratio (the ratio of sample rate change)
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source_ratio = ratio;
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dest_ratio = 1.0 / ratio;
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num_of_samples = buffer->getNumSamples();
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new_num_of_samples = round(num_of_samples * dest_ratio);
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// Set resample ratio
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resample_source->setResamplingRatio(source_ratio);
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// Prepare to play resample source
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if (!isPrepared)
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{
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// Prepare to play the audio sources (and set the # of samples per chunk to a little more than expected)
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resample_source->prepareToPlay(num_of_samples + 10, 0);
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isPrepared = true;
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}
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// Resize buffer for the newly resampled data
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resampled_buffer->setSize(buffer->getNumChannels(), new_num_of_samples, true, true, true);
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resample_callback_buffer.numSamples = new_num_of_samples;
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resample_callback_buffer.startSample = 0;
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resample_callback_buffer.clearActiveBufferRegion();
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}
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// Get the resampled audio buffer
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juce::AudioBuffer<float>* AudioResampler::GetResampledBuffer()
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{
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// Resample the current frame's audio buffer (into the temp callback buffer)
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resample_source->getNextAudioBlock(resample_callback_buffer);
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// Return buffer pointer to this newly resampled buffer
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return resampled_buffer;
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}
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