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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_CODING_NETEQ_AUDIO_MULTI_VECTOR_H_
#define MODULES_AUDIO_CODING_NETEQ_AUDIO_MULTI_VECTOR_H_
#include <stdint.h>
#include <string.h>
#include <memory>
#include <vector>
#include "api/array_view.h"
#include "modules/audio_coding/neteq/audio_vector.h"
namespace webrtc {
// TODO: b/335805780 - Update to use InterleavedView.
class AudioMultiVector {
public:
// Creates an empty AudioMultiVector with `N` audio channels. `N` must be
// larger than 0.
explicit AudioMultiVector(size_t N);
// Creates an AudioMultiVector with `N` audio channels, each channel having
// an initial size. `N` must be larger than 0.
AudioMultiVector(size_t N, size_t initial_size);
virtual ~AudioMultiVector();
AudioMultiVector(const AudioMultiVector&) = delete;
AudioMultiVector& operator=(const AudioMultiVector&) = delete;
// Deletes all values and make the vector empty.
void Clear();
// Clears the vector and inserts `length` zeros into each channel.
void Zeros(size_t length);
// Copies all values from this vector to `copy_to`. Any contents in `copy_to`
// are deleted. After the operation is done, `copy_to` will be an exact
// replica of this object. The source and the destination must have the same
// number of channels.
void CopyTo(AudioMultiVector* copy_to) const;
// Appends the contents of `append_this` to the end of this object. The array
// is assumed to be channel-interleaved. The length must be an even multiple
// of this object's number of channels. The length of this object is increased
// with the length of the array divided by the number of channels.
void PushBackInterleaved(ArrayView<const int16_t> append_this);
// Appends the contents of AudioMultiVector `append_this` to this object. The
// length of this object is increased with the length of `append_this`.
virtual void PushBack(const AudioMultiVector& append_this);
// Appends the contents of AudioMultiVector `append_this` to this object,
// taken from `index` up until the end of `append_this`. The length of this
// object is increased.
void PushBackFromIndex(const AudioMultiVector& append_this, size_t index);
// Removes `length` elements from the beginning of this object, from each
// channel.
void PopFront(size_t length);
// Removes `length` elements from the end of this object, from each
// channel.
void PopBack(size_t length);
// Reads `length` samples from each channel and writes them interleaved to
// `destination`. The total number of elements written to `destination` is
// returned, i.e., `length` * number of channels. If the AudioMultiVector
// contains less than `length` samples per channel, this is reflected in the
// return value.
size_t ReadInterleaved(size_t length, int16_t* destination) const;
// Like ReadInterleaved() above, but reads from `start_index` instead of from
// the beginning.
size_t ReadInterleavedFromIndex(size_t start_index,
size_t length,
int16_t* destination) const;
// Like ReadInterleaved() above, but reads from the end instead of from
// the beginning.
size_t ReadInterleavedFromEnd(size_t length, int16_t* destination) const;
// Overwrites each channel in this AudioMultiVector with values taken from
// `insert_this`. The values are taken from the beginning of `insert_this` and
// are inserted starting at `position`. `length` values are written into each
// channel. If `length` and `position` are selected such that the new data
// extends beyond the end of the current AudioVector, the vector is extended
// to accommodate the new data. `length` is limited to the length of
// `insert_this`.
void OverwriteAt(const AudioMultiVector& insert_this,
size_t length,
size_t position);
// Appends `append_this` to the end of the current vector. Lets the two
// vectors overlap by `fade_length` samples (per channel), and cross-fade
// linearly in this region.
void CrossFade(const AudioMultiVector& append_this, size_t fade_length);
// Returns the number of channels.
size_t Channels() const;
// Returns the number of elements per channel in this AudioMultiVector.
size_t Size() const;
// Verify that each channel can hold at least `required_size` elements. If
// not, extend accordingly.
void AssertSize(size_t required_size);
bool Empty() const;
// Copies the data between two channels in the AudioMultiVector. The method
// does not add any new channel. Thus, `from_channel` and `to_channel` must
// both be valid channel numbers.
void CopyChannel(size_t from_channel, size_t to_channel);
// Accesses and modifies a channel (i.e., an AudioVector object) of this
// AudioMultiVector.
const AudioVector& operator[](size_t index) const;
AudioVector& operator[](size_t index);
protected:
std::vector<std::unique_ptr<AudioVector>> channels_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_CODING_NETEQ_AUDIO_MULTI_VECTOR_H_
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