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1 /* | 1 /* |
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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25 class DelayPeakDetector; | 25 class DelayPeakDetector; |
26 | 26 |
27 class DelayManager { | 27 class DelayManager { |
28 public: | 28 public: |
29 typedef std::vector<int> IATVector; | 29 typedef std::vector<int> IATVector; |
30 | 30 |
31 // Create a DelayManager object. Notify the delay manager that the packet | 31 // Create a DelayManager object. Notify the delay manager that the packet |
32 // buffer can hold no more than |max_packets_in_buffer| packets (i.e., this | 32 // buffer can hold no more than |max_packets_in_buffer| packets (i.e., this |
33 // is the number of packet slots in the buffer). Supply a PeakDetector | 33 // is the number of packet slots in the buffer). Supply a PeakDetector |
34 // object to the DelayManager. | 34 // object to the DelayManager. |
35 DelayManager(int max_packets_in_buffer, DelayPeakDetector* peak_detector); | 35 DelayManager(size_t max_packets_in_buffer, DelayPeakDetector* peak_detector); |
36 | 36 |
37 virtual ~DelayManager(); | 37 virtual ~DelayManager(); |
38 | 38 |
39 // Read the inter-arrival time histogram. Mainly for testing purposes. | 39 // Read the inter-arrival time histogram. Mainly for testing purposes. |
40 virtual const IATVector& iat_vector() const; | 40 virtual const IATVector& iat_vector() const; |
41 | 41 |
42 // Updates the delay manager with a new incoming packet, with | 42 // Updates the delay manager with a new incoming packet, with |
43 // |sequence_number| and |timestamp| from the RTP header. This updates the | 43 // |sequence_number| and |timestamp| from the RTP header. This updates the |
44 // inter-arrival time histogram and other statistics, as well as the | 44 // inter-arrival time histogram and other statistics, as well as the |
45 // associated DelayPeakDetector. A new target buffer level is calculated. | 45 // associated DelayPeakDetector. A new target buffer level is calculated. |
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125 // equal to |iat_packets| (in integer packets) is increased slightly, while | 125 // equal to |iat_packets| (in integer packets) is increased slightly, while |
126 // all other entries are decreased. This method is called by Update(). | 126 // all other entries are decreased. This method is called by Update(). |
127 void UpdateHistogram(size_t iat_packets); | 127 void UpdateHistogram(size_t iat_packets); |
128 | 128 |
129 // Makes sure that |target_level_| is not too large, taking | 129 // Makes sure that |target_level_| is not too large, taking |
130 // |max_packets_in_buffer_| and |extra_delay_ms_| into account. This method is | 130 // |max_packets_in_buffer_| and |extra_delay_ms_| into account. This method is |
131 // called by Update(). | 131 // called by Update(). |
132 void LimitTargetLevel(); | 132 void LimitTargetLevel(); |
133 | 133 |
134 bool first_packet_received_; | 134 bool first_packet_received_; |
135 const int max_packets_in_buffer_; // Capacity of the packet buffer. | 135 const size_t max_packets_in_buffer_; // Capacity of the packet buffer. |
136 IATVector iat_vector_; // Histogram of inter-arrival times. | 136 IATVector iat_vector_; // Histogram of inter-arrival times. |
137 int iat_factor_; // Forgetting factor for updating the IAT histogram (Q15). | 137 int iat_factor_; // Forgetting factor for updating the IAT histogram (Q15). |
138 int packet_iat_count_ms_; // Milliseconds elapsed since last packet. | 138 int packet_iat_count_ms_; // Milliseconds elapsed since last packet. |
139 int base_target_level_; // Currently preferred buffer level before peak | 139 int base_target_level_; // Currently preferred buffer level before peak |
140 // detection and streaming mode (Q0). | 140 // detection and streaming mode (Q0). |
141 // TODO(turajs) change the comment according to the implementation of | 141 // TODO(turajs) change the comment according to the implementation of |
142 // minimum-delay. | 142 // minimum-delay. |
143 int target_level_; // Currently preferred buffer level in (fractions) | 143 int target_level_; // Currently preferred buffer level in (fractions) |
144 // of packets (Q8), before adding any extra delay. | 144 // of packets (Q8), before adding any extra delay. |
145 int packet_len_ms_; // Length of audio in each incoming packet [ms]. | 145 int packet_len_ms_; // Length of audio in each incoming packet [ms]. |
146 bool streaming_mode_; | 146 bool streaming_mode_; |
147 uint16_t last_seq_no_; // Sequence number for last received packet. | 147 uint16_t last_seq_no_; // Sequence number for last received packet. |
148 uint32_t last_timestamp_; // Timestamp for the last received packet. | 148 uint32_t last_timestamp_; // Timestamp for the last received packet. |
149 int minimum_delay_ms_; // Externally set minimum delay. | 149 int minimum_delay_ms_; // Externally set minimum delay. |
150 int least_required_delay_ms_; // Smallest preferred buffer level (same unit | 150 int least_required_delay_ms_; // Smallest preferred buffer level (same unit |
151 // as |target_level_|), before applying | 151 // as |target_level_|), before applying |
152 // |minimum_delay_ms_| and/or |maximum_delay_ms_|. | 152 // |minimum_delay_ms_| and/or |maximum_delay_ms_|. |
153 int maximum_delay_ms_; // Externally set maximum allowed delay. | 153 int maximum_delay_ms_; // Externally set maximum allowed delay. |
154 int iat_cumulative_sum_; // Cumulative sum of delta inter-arrival times. | 154 int iat_cumulative_sum_; // Cumulative sum of delta inter-arrival times. |
155 int max_iat_cumulative_sum_; // Max of |iat_cumulative_sum_|. | 155 int max_iat_cumulative_sum_; // Max of |iat_cumulative_sum_|. |
156 int max_timer_ms_; // Time elapsed since maximum was observed. | 156 int max_timer_ms_; // Time elapsed since maximum was observed. |
157 DelayPeakDetector& peak_detector_; | 157 DelayPeakDetector& peak_detector_; |
158 int last_pack_cng_or_dtmf_; | 158 int last_pack_cng_or_dtmf_; |
159 | 159 |
160 DISALLOW_COPY_AND_ASSIGN(DelayManager); | 160 DISALLOW_COPY_AND_ASSIGN(DelayManager); |
161 }; | 161 }; |
162 | 162 |
163 } // namespace webrtc | 163 } // namespace webrtc |
164 #endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_DELAY_MANAGER_H_ | 164 #endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_DELAY_MANAGER_H_ |
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