| /* |
| * Copyright (c) 2012 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 WEBRTC_MODULES_AUDIO_CODING_NETEQ_BUFFER_LEVEL_FILTER_H_ |
| #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_BUFFER_LEVEL_FILTER_H_ |
| |
| #include <stddef.h> |
| |
| #include "webrtc/base/constructormagic.h" |
| |
| namespace webrtc { |
| |
| class BufferLevelFilter { |
| public: |
| BufferLevelFilter(); |
| virtual ~BufferLevelFilter() {} |
| virtual void Reset(); |
| |
| // Updates the filter. Current buffer size is |buffer_size_packets| (Q0). |
| // If |time_stretched_samples| is non-zero, the value is converted to the |
| // corresponding number of packets, and is subtracted from the filtered |
| // value (thus bypassing the filter operation). |packet_len_samples| is the |
| // number of audio samples carried in each incoming packet. |
| virtual void Update(size_t buffer_size_packets, int time_stretched_samples, |
| size_t packet_len_samples); |
| |
| // Set the current target buffer level (obtained from |
| // DelayManager::base_target_level()). Used to select the appropriate |
| // filter coefficient. |
| virtual void SetTargetBufferLevel(int target_buffer_level); |
| |
| virtual int filtered_current_level() const; |
| |
| private: |
| int level_factor_; // Filter factor for the buffer level filter in Q8. |
| int filtered_current_level_; // Filtered current buffer level in Q8. |
| |
| RTC_DISALLOW_COPY_AND_ASSIGN(BufferLevelFilter); |
| }; |
| |
| } // namespace webrtc |
| #endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_BUFFER_LEVEL_FILTER_H_ |