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121 lines
4.6 KiB
C++
121 lines
4.6 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_VECTOR_H_
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#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_VECTOR_H_
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#include <string.h> // Access to size_t.
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/system_wrappers/interface/scoped_ptr.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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class AudioVector {
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public:
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// Creates an empty AudioVector.
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AudioVector()
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: array_(new int16_t[kDefaultInitialSize]),
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first_free_ix_(0),
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capacity_(kDefaultInitialSize) {}
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// Creates an AudioVector with an initial size.
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explicit AudioVector(size_t initial_size)
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: array_(new int16_t[initial_size]),
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first_free_ix_(initial_size),
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capacity_(initial_size) {
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memset(array_.get(), 0, initial_size * sizeof(int16_t));
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}
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virtual ~AudioVector() {}
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// Deletes all values and make the vector empty.
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virtual void Clear();
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// Copies all values from this vector to |copy_to|. Any contents in |copy_to|
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// are deleted before the copy operation. After the operation is done,
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// |copy_to| will be an exact replica of this object.
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virtual void CopyFrom(AudioVector* copy_to) const;
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// Prepends the contents of AudioVector |prepend_this| to this object. The
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// length of this object is increased with the length of |prepend_this|.
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virtual void PushFront(const AudioVector& prepend_this);
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// Same as above, but with an array |prepend_this| with |length| elements as
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// source.
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virtual void PushFront(const int16_t* prepend_this, size_t length);
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// Same as PushFront but will append to the end of this object.
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virtual void PushBack(const AudioVector& append_this);
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// Same as PushFront but will append to the end of this object.
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virtual void PushBack(const int16_t* append_this, size_t length);
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// Removes |length| elements from the beginning of this object.
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virtual void PopFront(size_t length);
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// Removes |length| elements from the end of this object.
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virtual void PopBack(size_t length);
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// Extends this object with |extra_length| elements at the end. The new
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// elements are initialized to zero.
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virtual void Extend(size_t extra_length);
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// Inserts |length| elements taken from the array |insert_this| and insert
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// them at |position|. The length of the AudioVector is increased by |length|.
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// |position| = 0 means that the new values are prepended to the vector.
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// |position| = Size() means that the new values are appended to the vector.
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virtual void InsertAt(const int16_t* insert_this, size_t length,
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size_t position);
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// Like InsertAt, but inserts |length| zero elements at |position|.
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virtual void InsertZerosAt(size_t length, size_t position);
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// Overwrites |length| elements of this AudioVector with values taken from the
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// array |insert_this|, starting at |position|. The definition of |position|
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// is the same as for InsertAt(). If |length| and |position| are selected
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// such that the new data extends beyond the end of the current AudioVector,
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// the vector is extended to accommodate the new data.
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virtual void OverwriteAt(const int16_t* insert_this,
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size_t length,
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size_t position);
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// Appends |append_this| to the end of the current vector. Lets the two
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// vectors overlap by |fade_length| samples, and cross-fade linearly in this
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// region.
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virtual void CrossFade(const AudioVector& append_this, size_t fade_length);
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// Returns the number of elements in this AudioVector.
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virtual size_t Size() const { return first_free_ix_; }
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// Returns true if this AudioVector is empty.
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virtual bool Empty() const { return (first_free_ix_ == 0); }
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// Accesses and modifies an element of AudioVector.
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const int16_t& operator[](size_t index) const;
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int16_t& operator[](size_t index);
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private:
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static const size_t kDefaultInitialSize = 10;
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void Reserve(size_t n);
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scoped_ptr<int16_t[]> array_;
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size_t first_free_ix_; // The first index after the last sample in array_.
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// Note that this index may point outside of array_.
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size_t capacity_; // Allocated number of samples in the array.
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DISALLOW_COPY_AND_ASSIGN(AudioVector);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_VECTOR_H_
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