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| 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_ |
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