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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 |
11 #include "webrtc/modules/rtp_rtcp/source/producer_fec.h" | 11 #include "webrtc/modules/rtp_rtcp/source/producer_fec.h" |
12 | 12 |
13 #include "webrtc/modules/rtp_rtcp/source/byte_io.h" | 13 #include "webrtc/modules/rtp_rtcp/source/byte_io.h" |
14 #include "webrtc/modules/rtp_rtcp/source/forward_error_correction.h" | 14 #include "webrtc/modules/rtp_rtcp/source/forward_error_correction.h" |
15 #include "webrtc/modules/rtp_rtcp/source/rtp_utility.h" | 15 #include "webrtc/modules/rtp_rtcp/source/rtp_utility.h" |
16 | 16 |
17 namespace webrtc { | 17 namespace webrtc { |
18 | 18 |
19 enum { kREDForFECHeaderLength = 1 }; | 19 enum { kREDForFECHeaderLength = 1 }; |
20 // This controls the maximum amount of excess overhead (actual - target) | 20 // This controls the maximum amount of excess overhead (actual - target) |
21 // allowed in order to trigger GenerateFEC(), before |params_.max_fec_frames| | 21 // allowed in order to trigger GenerateFec(), before |params_.max_fec_frames| |
22 // is reached. Overhead here is defined as relative to number of media packets. | 22 // is reached. Overhead here is defined as relative to number of media packets. |
23 enum { kMaxExcessOverhead = 50 }; // Q8. | 23 enum { kMaxExcessOverhead = 50 }; // Q8. |
24 // This is the minimum number of media packets required (above some protection | 24 // This is the minimum number of media packets required (above some protection |
25 // level) in order to trigger GenerateFEC(), before |params_.max_fec_frames| is | 25 // level) in order to trigger GenerateFec(), before |params_.max_fec_frames| is |
26 // reached. | 26 // reached. |
27 enum { kMinimumMediaPackets = 4 }; | 27 enum { kMinimumMediaPackets = 4 }; |
28 // Threshold on the received FEC protection level, above which we enforce at | 28 // Threshold on the received FEC protection level, above which we enforce at |
29 // least |kMinimumMediaPackets| packets for the FEC code. Below this | 29 // least |kMinimumMediaPackets| packets for the FEC code. Below this |
30 // threshold |kMinimumMediaPackets| is set to default value of 1. | 30 // threshold |kMinimumMediaPackets| is set to default value of 1. |
31 enum { kHighProtectionThreshold = 80 }; // Corresponds to ~30 overhead, range | 31 enum { kHighProtectionThreshold = 80 }; // Corresponds to ~30 overhead, range |
32 // is 0 to 255, where 255 corresponds to 100% overhead (relative to number of | 32 // is 0 to 255, where 255 corresponds to 100% overhead (relative to number of |
33 // media packets). | 33 // media packets). |
34 | 34 |
35 RedPacket::RedPacket(size_t length) | 35 RedPacket::RedPacket(size_t length) |
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132 size_t payload_length, | 132 size_t payload_length, |
133 size_t rtp_header_length) { | 133 size_t rtp_header_length) { |
134 assert(fec_packets_.empty()); | 134 assert(fec_packets_.empty()); |
135 if (media_packets_fec_.empty()) { | 135 if (media_packets_fec_.empty()) { |
136 params_ = new_params_; | 136 params_ = new_params_; |
137 } | 137 } |
138 bool complete_frame = false; | 138 bool complete_frame = false; |
139 const bool marker_bit = (data_buffer[1] & kRtpMarkerBitMask) ? true : false; | 139 const bool marker_bit = (data_buffer[1] & kRtpMarkerBitMask) ? true : false; |
140 if (media_packets_fec_.size() < ForwardErrorCorrection::kMaxMediaPackets) { | 140 if (media_packets_fec_.size() < ForwardErrorCorrection::kMaxMediaPackets) { |
141 // Generic FEC can only protect up to kMaxMediaPackets packets. | 141 // Generic FEC can only protect up to kMaxMediaPackets packets. |
142 ForwardErrorCorrection::Packet* packet = new ForwardErrorCorrection::Packet; | 142 ForwardErrorCorrection::Packet* packet = |
| 143 new ForwardErrorCorrection::Packet(); |
143 packet->length = payload_length + rtp_header_length; | 144 packet->length = payload_length + rtp_header_length; |
144 memcpy(packet->data, data_buffer, packet->length); | 145 memcpy(packet->data, data_buffer, packet->length); |
145 media_packets_fec_.push_back(packet); | 146 media_packets_fec_.push_back(packet); |
146 } | 147 } |
147 if (marker_bit) { | 148 if (marker_bit) { |
148 ++num_frames_; | 149 ++num_frames_; |
149 complete_frame = true; | 150 complete_frame = true; |
150 } | 151 } |
151 // Produce FEC over at most |params_.max_fec_frames| frames, or as soon as: | 152 // Produce FEC over at most |params_.max_fec_frames| frames, or as soon as: |
152 // (1) the excess overhead (actual overhead - requested/target overhead) is | 153 // (1) the excess overhead (actual overhead - requested/target overhead) is |
153 // less than |kMaxExcessOverhead|, and | 154 // less than |kMaxExcessOverhead|, and |
154 // (2) at least |minimum_media_packets_fec_| media packets is reached. | 155 // (2) at least |minimum_media_packets_fec_| media packets is reached. |
155 if (complete_frame && | 156 if (complete_frame && |
156 (num_frames_ == params_.max_fec_frames || | 157 (num_frames_ == params_.max_fec_frames || |
157 (ExcessOverheadBelowMax() && MinimumMediaPacketsReached()))) { | 158 (ExcessOverheadBelowMax() && MinimumMediaPacketsReached()))) { |
158 assert(num_first_partition_ <= | 159 assert(num_first_partition_ <= |
159 static_cast<int>(ForwardErrorCorrection::kMaxMediaPackets)); | 160 static_cast<int>(ForwardErrorCorrection::kMaxMediaPackets)); |
160 // TODO(pbos): Consider whether unequal protection should be enabled or not, | 161 // TODO(pbos): Consider whether unequal protection should be enabled or not, |
161 // it is currently always disabled. | 162 // it is currently always disabled. |
162 int ret = fec_->GenerateFEC(media_packets_fec_, params_.fec_rate, | 163 int ret = fec_->GenerateFec(media_packets_fec_, params_.fec_rate, |
163 num_first_partition_, false, | 164 num_first_partition_, false, |
164 params_.fec_mask_type, &fec_packets_); | 165 params_.fec_mask_type, &fec_packets_); |
165 if (fec_packets_.empty()) { | 166 if (fec_packets_.empty()) { |
166 num_frames_ = 0; | 167 num_frames_ = 0; |
167 DeletePackets(); | 168 DeletePackets(); |
168 } | 169 } |
169 return ret; | 170 return ret; |
170 } | 171 } |
171 return 0; | 172 return 0; |
172 } | 173 } |
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251 | 252 |
252 void ProducerFec::DeletePackets() { | 253 void ProducerFec::DeletePackets() { |
253 while (!media_packets_fec_.empty()) { | 254 while (!media_packets_fec_.empty()) { |
254 delete media_packets_fec_.front(); | 255 delete media_packets_fec_.front(); |
255 media_packets_fec_.pop_front(); | 256 media_packets_fec_.pop_front(); |
256 } | 257 } |
257 assert(media_packets_fec_.empty()); | 258 assert(media_packets_fec_.empty()); |
258 } | 259 } |
259 | 260 |
260 } // namespace webrtc | 261 } // namespace webrtc |
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