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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
Audacity: A Digital Audio Editor
@file AudioSegmentSampleView.h
@brief An audio segment is either a whole clip or the silence between clips.
Views allow shared references to the same memory yet over instance-specific
ranges.
Matthieu Hodgkinson
**********************************************************************/
#pragma once
#include "SampleCount.h"
#include <chrono>
#include <fstream>
#include <memory>
#include <vector>
using BlockSampleView = std::shared_ptr<std::vector<float>>;
class STRETCHING_SEQUENCE_API AudioSegmentSampleView final
{
public:
/**
* @brief Constructs an `AudioSegmentSampleView` from `BlockSampleView`s.
* @param blockViews A continuous sequence of samples, segmented in blocks.
* @param start Index of the first sample in `blockViews` to look at.
* @param length The number of samples from `start` to look at.
* @pre `!blockViews.empty()`
* @pre `start < blockViews[0].size()`
* @pre length <= sum(sizes(blockViews)) - start
*/
AudioSegmentSampleView(
std::vector<BlockSampleView> blockViews, size_t start, size_t length);
/**
* @brief Constructs a silent `AudioSegmentSampleView`.
* @param length The number of "silence samples".
*/
AudioSegmentSampleView(size_t length);
/**
* @brief Copies up to `GetSampleCount()` or `bufferSize` samples, whichever
* is less, into `buffer`. Samples after that are zeroed.
*/
void Copy(float* buffer, size_t bufferSize) const;
/**
* @brief Adds up to `GetSampleCount()` or `bufferSize` samples, whichever
* is less, into `buffer`. Samples after that are left unchanged.
*/
void AddTo(float* buffer, size_t bufferSize) const;
/**
* @brief The number of samples in this view.
*/
size_t GetSampleCount() const;
private:
void DoCopy(float* buffer, size_t bufferSize) const;
void DoAdd(float* buffer, size_t bufferSize) const;
const std::vector<BlockSampleView> mBlockViews;
const size_t mStart = 0;
const size_t mLength;
const bool mIsSilent;
};
using ChannelSampleView = std::vector<AudioSegmentSampleView>;
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