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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_VECTOR_H_
#define MODULES_AUDIO_CODING_NETEQ_AUDIO_VECTOR_H_
#include <string.h>
#include <cstdint>
#include <memory>
#include "rtc_base/checks.h"
namespace webrtc {
class AudioVector final {
public:
// Creates an empty AudioVector.
AudioVector();
// Creates an AudioVector with an initial size.
explicit AudioVector(size_t initial_size);
~AudioVector();
AudioVector(const AudioVector&) = delete;
AudioVector& operator=(const AudioVector&) = delete;
// Deletes all values and make the vector empty.
void Clear();
// Copies all values from this vector to `copy_to`. Any contents in `copy_to`
// are deleted before the copy operation. After the operation is done,
// `copy_to` will be an exact replica of this object.
void CopyTo(AudioVector* copy_to) const;
// Copies `length` values from `position` in this vector to `copy_to`.
void CopyTo(size_t length, size_t position, int16_t* copy_to) const;
// Prepends the contents of AudioVector `prepend_this` to this object. The
// length of this object is increased with the length of `prepend_this`.
void PushFront(const AudioVector& prepend_this);
// Same as above, but with an array `prepend_this` with `length` elements as
// source.
void PushFront(const int16_t* prepend_this, size_t length);
// Same as PushFront but will append to the end of this object.
void PushBack(const AudioVector& append_this);
// Appends a segment of `append_this` to the end of this object. The segment
// starts from `position` and has `length` samples.
void PushBack(const AudioVector& append_this, size_t length, size_t position);
// Same as PushFront but will append to the end of this object.
void PushBack(const int16_t* append_this, size_t length);
// Removes `length` elements from the beginning of this object.
void PopFront(size_t length);
// Removes `length` elements from the end of this object.
void PopBack(size_t length);
// Extends this object with `extra_length` elements at the end. The new
// elements are initialized to zero.
void Extend(size_t extra_length);
// Inserts `length` elements taken from the array `insert_this` and insert
// them at `position`. The length of the AudioVector is increased by `length`.
// `position` = 0 means that the new values are prepended to the vector.
// `position` = Size() means that the new values are appended to the vector.
void InsertAt(const int16_t* insert_this, size_t length, size_t position);
// Like InsertAt, but inserts `length` zero elements at `position`.
void InsertZerosAt(size_t length, size_t position);
// Overwrites `length` elements of this AudioVector starting from `position`
// with first values in `AudioVector`. The definition of `position`
// is the same as for InsertAt(). 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.
void OverwriteAt(const AudioVector& insert_this,
size_t length,
size_t position);
// Overwrites `length` elements of this AudioVector with values taken from the
// array `insert_this`, starting at `position`. The definition of `position`
// is the same as for InsertAt(). 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.
void OverwriteAt(const int16_t* 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, and cross-fade linearly in this
// region.
void CrossFade(const AudioVector& append_this, size_t fade_length);
// Returns the number of elements in this AudioVector.
size_t Size() const;
// Returns true if this AudioVector is empty.
bool Empty() const;
// Accesses and modifies an element of AudioVector.
inline const int16_t& operator[](size_t index) const {
return array_[WrapIndex(index, begin_index_, capacity_)];
}
inline int16_t& operator[](size_t index) {
return array_[WrapIndex(index, begin_index_, capacity_)];
}
private:
static const size_t kDefaultInitialSize = 10;
// This method is used by the [] operators to calculate an index within the
// capacity of the array, but without using the modulo operation (%).
static inline size_t WrapIndex(size_t index,
size_t begin_index,
size_t capacity) {
RTC_DCHECK_LT(index, capacity);
RTC_DCHECK_LT(begin_index, capacity);
size_t ix = begin_index + index;
RTC_DCHECK_GE(ix, index); // Check for overflow.
if (ix >= capacity) {
ix -= capacity;
}
RTC_DCHECK_LT(ix, capacity);
return ix;
}
void Reserve(size_t n);
void InsertByPushBack(const int16_t* insert_this,
size_t length,
size_t position);
void InsertByPushFront(const int16_t* insert_this,
size_t length,
size_t position);
void InsertZerosByPushBack(size_t length, size_t position);
void InsertZerosByPushFront(size_t length, size_t position);
std::unique_ptr<int16_t[]> array_;
size_t capacity_; // Allocated number of samples in the array.
// The index of the first sample in `array_`, except when
// |begin_index_ == end_index_|, which indicates an empty buffer.
size_t begin_index_;
// The index of the sample after the last sample in `array_`.
size_t end_index_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_CODING_NETEQ_AUDIO_VECTOR_H_
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