136 lines
3.8 KiB
C++
136 lines
3.8 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2022 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#ifndef SUMSAMPLES_H
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#define SUMSAMPLES_H
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#include <QPainter>
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#include <QVector>
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#include "codec/samplebuffer.h"
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namespace olive {
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/**
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* @brief A buffer of data used to store a visual representation of audio
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*
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* This differs from a SampleBuffer as the data in an AudioVisualWaveform has been reduced
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* significantly and optimized for visual display.
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*/
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class AudioVisualWaveform {
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public:
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AudioVisualWaveform();
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struct SamplePerChannel {
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float min;
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float max;
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};
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using Sample = QVector<SamplePerChannel>;
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int channel_count() const
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{
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return channels_;
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}
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void set_channel_count(int channels)
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{
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channels_ = channels;
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}
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const rational& length() const
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{
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return length_;
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}
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/**
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* @brief Writes samples into the visual waveform buffer
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*
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* Starting at `start`, writes samples over anything in the buffer, expanding it if necessary.
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*/
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void OverwriteSamples(const SampleBuffer &samples, int sample_rate, const rational& start = 0);
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/**
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* @brief Replaces sums at a certain range in this visual waveform
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*
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* @param sums
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*
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* The sums to write over our current ones with.
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*
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* @param dest
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*
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* Where in this visual waveform these sums should START being written to.
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*
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* @param offset
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*
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* Where in the `sums` parameter this should start reading from. Defaults to 0.
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*
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* @param length
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*
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* Maximum length of `sums` to overwrite with.
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*/
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void OverwriteSums(const AudioVisualWaveform& sums, const rational& dest, const rational& offset = 0, const rational &length = 0);
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void OverwriteSilence(const rational &start, const rational &length);
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void Shift(const rational& from, const rational& to);
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void TrimIn(const rational &length);
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AudioVisualWaveform Mid(const rational &offset) const;
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Sample GetSummaryFromTime(const rational& start, const rational& length) const;
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static Sample SumSamples(const SampleBuffer &samples, int start_index, int length);
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static Sample ReSumSamples(const SamplePerChannel *samples, int nb_samples, int nb_channels);
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static void DrawSample(QPainter* painter, const Sample &sample, int x, int y, int height, bool rectified);
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static void DrawWaveform(QPainter* painter, const QRect &rect, const double &scale, const AudioVisualWaveform& samples, const rational &start_time);
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// Must be a power of 2
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static const rational kMinimumSampleRate;
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static const rational kMaximumSampleRate;
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private:
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void OverwriteSamplesFromBuffer(const SampleBuffer &samples, int sample_rate, const rational& start, double target_rate, Sample &data, int &start_index, int &samples_length);
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void OverwriteSamplesFromMipmap(const Sample& input, double input_sample_rate, int &input_start, int &input_length, const rational& start, double output_rate, Sample &output_data);
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int time_to_samples(const rational& time, double sample_rate) const;
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int time_to_samples(const double& time, double sample_rate) const;
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std::map<rational, Sample>::const_iterator GetMipmapForScale(double scale) const;
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int channels_;
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std::map<rational, Sample> mipmapped_data_;
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rational length_;
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};
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}
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Q_DECLARE_METATYPE(olive::AudioVisualWaveform)
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#endif // SUMSAMPLES_H
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