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/*
* Copyright (c) 2020 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 API_AUDIO_AUDIO_FRAME_PROCESSOR_H_
#define API_AUDIO_AUDIO_FRAME_PROCESSOR_H_
#include <functional>
#include <memory>
namespace webrtc {
class AudioFrame;
// If passed into PeerConnectionFactory, will be used for additional
// processing of captured audio frames, performed before encoding.
// Implementations must be thread-safe.
class AudioFrameProcessor {
public:
using OnAudioFrameCallback = std::function<void(std::unique_ptr<AudioFrame>)>;
virtual ~AudioFrameProcessor() = default;
// Processes the frame received from WebRTC, is called by WebRTC off the
// realtime audio capturing path. AudioFrameProcessor must reply with
// processed frames by calling `sink_callback` if it was provided in SetSink()
// call. `sink_callback` can be called in the context of Process().
virtual void Process(std::unique_ptr<AudioFrame> frame) = 0;
// Atomically replaces the current sink with the new one. Before the
// first call to this function, or if the provided `sink_callback` is nullptr,
// processed frames are simply discarded.
virtual void SetSink(OnAudioFrameCallback sink_callback) = 0;
};
} // namespace webrtc
#endif // API_AUDIO_AUDIO_FRAME_PROCESSOR_H_
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