67 lines
2.6 KiB
C
67 lines
2.6 KiB
C
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/*
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* Copyright (c) 2018 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 MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_FRAME_VIEW_H_
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#define MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_FRAME_VIEW_H_
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#include "api/audio/audio_view.h"
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namespace webrtc {
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// Class to pass audio data in T** format, where T is a numeric type.
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template <class T>
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class AudioFrameView {
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public:
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// `num_channels` and `channel_size` describe the T**
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// `audio_samples`. `audio_samples` is assumed to point to a
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// two-dimensional |num_channels * channel_size| array of floats.
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//
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// Note: The implementation now only requires the first channel pointer.
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// The previous implementation retained a pointer to externally owned array
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// of channel pointers, but since the channel size and count are provided
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// and the array is assumed to be a single two-dimensional array, the other
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// channel pointers can be calculated based on that (which is what the class
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// now uses `DeinterleavedView<>` internally for).
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AudioFrameView(T* const* audio_samples, int num_channels, int channel_size)
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: view_(num_channels && channel_size ? audio_samples[0] : nullptr,
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channel_size,
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num_channels) {
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RTC_DCHECK_GE(view_.num_channels(), 0);
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RTC_DCHECK_GE(view_.samples_per_channel(), 0);
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}
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// Implicit cast to allow converting AudioFrameView<float> to
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// AudioFrameView<const float>.
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template <class U>
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AudioFrameView(AudioFrameView<U> other) : view_(other.view()) {}
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// Allow constructing AudioFrameView from a DeinterleavedView.
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template <class U>
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explicit AudioFrameView(DeinterleavedView<U> view) : view_(view) {}
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AudioFrameView() = delete;
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int num_channels() const { return view_.num_channels(); }
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int samples_per_channel() const { return view_.samples_per_channel(); }
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MonoView<T> channel(int idx) { return view_[idx]; }
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MonoView<const T> channel(int idx) const { return view_[idx]; }
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MonoView<T> operator[](int idx) { return view_[idx]; }
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MonoView<const T> operator[](int idx) const { return view_[idx]; }
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DeinterleavedView<T> view() { return view_; }
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DeinterleavedView<const T> view() const { return view_; }
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private:
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DeinterleavedView<T> view_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_FRAME_VIEW_H_
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