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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 WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_MULTI_VECTOR_H_
#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_MULTI_VECTOR_H_
#include <string.h> // Access to size_t.
#include <vector>
#include "webrtc/base/constructormagic.h"
#include "webrtc/modules/audio_coding/neteq/audio_vector.h"
#include "webrtc/typedefs.h"
namespace webrtc {
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();
// Deletes all values and make the vector empty.
virtual void Clear();
// Clears the vector and inserts |length| zeros into each channel.
virtual 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.
virtual void CopyTo(AudioMultiVector* copy_to) const;
// Appends the contents of array |append_this| to the end of this
// object. The array is assumed to be channel-interleaved. |length| must be
// an even multiple of this object's number of channels.
// The length of this object is increased with the |length| divided by the
// number of channels.
virtual void PushBackInterleaved(const int16_t* append_this, size_t length);
// 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.
virtual void PushBackFromIndex(const AudioMultiVector& append_this,
size_t index);
// Removes |length| elements from the beginning of this object, from each
// channel.
virtual void PopFront(size_t length);
// Removes |length| elements from the end of this object, from each
// channel.
virtual 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.
virtual size_t ReadInterleaved(size_t length, int16_t* destination) const;
// Like ReadInterleaved() above, but reads from |start_index| instead of from
// the beginning.
virtual 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.
virtual 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|.
virtual 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.
virtual void CrossFade(const AudioMultiVector& append_this,
size_t fade_length);
// Returns the number of channels.
virtual size_t Channels() const { return num_channels_; }
// Returns the number of elements per channel in this AudioMultiVector.
virtual size_t Size() const;
// Verify that each channel can hold at least |required_size| elements. If
// not, extend accordingly.
virtual void AssertSize(size_t required_size);
virtual 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.
virtual 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<AudioVector*> channels_;
size_t num_channels_;
private:
DISALLOW_COPY_AND_ASSIGN(AudioMultiVector);
};
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_MULTI_VECTOR_H_
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