audio_frame_processor.h (1616B)
1 /* 2 * Copyright (c) 2020 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef API_AUDIO_AUDIO_FRAME_PROCESSOR_H_ 12 #define API_AUDIO_AUDIO_FRAME_PROCESSOR_H_ 13 14 #include <functional> 15 #include <memory> 16 17 namespace webrtc { 18 19 class AudioFrame; 20 21 // If passed into PeerConnectionFactory, will be used for additional 22 // processing of captured audio frames, performed before encoding. 23 // Implementations must be thread-safe. 24 class AudioFrameProcessor { 25 public: 26 using OnAudioFrameCallback = std::function<void(std::unique_ptr<AudioFrame>)>; 27 virtual ~AudioFrameProcessor() = default; 28 29 // Processes the frame received from WebRTC, is called by WebRTC off the 30 // realtime audio capturing path. AudioFrameProcessor must reply with 31 // processed frames by calling `sink_callback` if it was provided in SetSink() 32 // call. `sink_callback` can be called in the context of Process(). 33 virtual void Process(std::unique_ptr<AudioFrame> frame) = 0; 34 35 // Atomically replaces the current sink with the new one. Before the 36 // first call to this function, or if the provided `sink_callback` is nullptr, 37 // processed frames are simply discarded. 38 virtual void SetSink(OnAudioFrameCallback sink_callback) = 0; 39 }; 40 41 } // namespace webrtc 42 43 #endif // API_AUDIO_AUDIO_FRAME_PROCESSOR_H_