1 /* 2 * Copyright (c) 2015 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 WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_BEAMFORMER_H_ 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_BEAMFORMER_H_ 13 14 #include "webrtc/common_audio/channel_buffer.h" 15 #include "webrtc/modules/audio_processing/beamformer/array_util.h" 16 17 namespace webrtc { 18 19 template<typename T> 20 class Beamformer { 21 public: 22 virtual ~Beamformer() {} 23 24 // Process one time-domain chunk of audio. The audio is expected to be split 25 // into frequency bands inside the ChannelBuffer. The number of frames and 26 // channels must correspond to the constructor parameters. The same 27 // ChannelBuffer can be passed in as |input| and |output|. 28 virtual void ProcessChunk(const ChannelBuffer<T>& input, 29 ChannelBuffer<T>* output) = 0; 30 31 // Sample rate corresponds to the lower band. 32 // Needs to be called before the the Beamformer can be used. 33 virtual void Initialize(int chunk_size_ms, int sample_rate_hz) = 0; 34 35 // Aim the beamformer at a point in space. 36 virtual void AimAt(const SphericalPointf& spherical_point) = 0; 37 38 // Indicates whether a given point is inside of the beam. 39 virtual bool IsInBeam(const SphericalPointf& spherical_point) { return true; } 40 41 // Returns true if the current data contains the target signal. 42 // Which signals are considered "targets" is implementation dependent. 43 virtual bool is_target_present() = 0; 44 }; 45 46 } // namespace webrtc 47 48 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_BEAMFORMER_H_ 49
