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/*
* Copyright (c) 2018 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_PROCESSING_INCLUDE_AUDIO_FRAME_VIEW_H_
#define MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_FRAME_VIEW_H_
#include "api/array_view.h"
namespace webrtc {
// Class to pass audio data in T** format, where T is a numeric type.
template <class T>
class AudioFrameView {
public:
// `num_channels` and `channel_size` describe the T**
// `audio_samples`. `audio_samples` is assumed to point to a
// two-dimensional |num_channels * channel_size| array of floats.
AudioFrameView(T* const* audio_samples, int num_channels, int channel_size)
: audio_samples_(audio_samples),
num_channels_(num_channels),
channel_size_(channel_size) {
RTC_DCHECK_GE(num_channels_, 0);
RTC_DCHECK_GE(channel_size_, 0);
}
// Implicit cast to allow converting Frame<float> to
// Frame<const float>.
template <class U>
AudioFrameView(AudioFrameView<U> other)
: audio_samples_(other.data()),
num_channels_(other.num_channels()),
channel_size_(other.samples_per_channel()) {}
AudioFrameView() = delete;
int num_channels() const { return num_channels_; }
int samples_per_channel() const { return channel_size_; }
rtc::ArrayView<T> channel(int idx) {
RTC_DCHECK_LE(0, idx);
RTC_DCHECK_LE(idx, num_channels_);
return rtc::ArrayView<T>(audio_samples_[idx], channel_size_);
}
rtc::ArrayView<const T> channel(int idx) const {
RTC_DCHECK_LE(0, idx);
RTC_DCHECK_LE(idx, num_channels_);
return rtc::ArrayView<const T>(audio_samples_[idx], channel_size_);
}
T* const* data() { return audio_samples_; }
private:
T* const* audio_samples_;
int num_channels_;
int channel_size_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_FRAME_VIEW_H_
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