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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "media/cast/rtcp/rtcp_receiver.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "media/cast/rtcp/rtcp_utility.h" | |
| 9 #include "media/cast/transport/cast_transport_defines.h" | |
| 10 | |
| 11 namespace { | |
| 12 | |
| 13 // A receiver frame event is identified by frame RTP timestamp, event timestamp | |
| 14 // and event type. | |
| 15 // A receiver packet event is identified by all of the above plus packet id. | |
| 16 // The key format is as follows: | |
| 17 // First uint64: | |
| 18 // bits 0-11: zeroes (unused). | |
| 19 // bits 12-15: event type ID. | |
| 20 // bits 16-31: packet ID if packet event, 0 otherwise. | |
| 21 // bits 32-63: RTP timestamp. | |
| 22 // Second uint64: | |
| 23 // bits 0-63: event TimeTicks internal value. | |
| 24 std::pair<uint64, uint64> GetReceiverEventKey( | |
| 25 uint32 frame_rtp_timestamp, const base::TimeTicks& event_timestamp, | |
| 26 uint8 event_type, uint16 packet_id_or_zero) { | |
| 27 uint64 value1 = event_type; | |
| 28 value1 <<= 16; | |
| 29 value1 |= packet_id_or_zero; | |
| 30 value1 <<= 32; | |
| 31 value1 |= frame_rtp_timestamp; | |
| 32 return std::make_pair( | |
| 33 value1, static_cast<uint64>(event_timestamp.ToInternalValue())); | |
| 34 } | |
| 35 | |
| 36 } // namespace | |
| 37 | |
| 38 namespace media { | |
| 39 namespace cast { | |
| 40 | |
| 41 RtcpReceiver::RtcpReceiver(scoped_refptr<CastEnvironment> cast_environment, | |
| 42 RtcpSenderFeedback* sender_feedback, | |
| 43 RtcpReceiverFeedback* receiver_feedback, | |
| 44 RtcpRttFeedback* rtt_feedback, | |
| 45 uint32 local_ssrc) | |
| 46 : ssrc_(local_ssrc), | |
| 47 remote_ssrc_(0), | |
| 48 sender_feedback_(sender_feedback), | |
| 49 receiver_feedback_(receiver_feedback), | |
| 50 rtt_feedback_(rtt_feedback), | |
| 51 cast_environment_(cast_environment), | |
| 52 receiver_event_history_size_(0) {} | |
| 53 | |
| 54 RtcpReceiver::~RtcpReceiver() {} | |
| 55 | |
| 56 void RtcpReceiver::SetRemoteSSRC(uint32 ssrc) { remote_ssrc_ = ssrc; } | |
| 57 | |
| 58 void RtcpReceiver::SetCastReceiverEventHistorySize(size_t size) { | |
| 59 receiver_event_history_size_ = size; | |
| 60 } | |
| 61 | |
| 62 void RtcpReceiver::IncomingRtcpPacket(RtcpParser* rtcp_parser) { | |
| 63 RtcpFieldTypes field_type = rtcp_parser->Begin(); | |
| 64 while (field_type != kRtcpNotValidCode) { | |
| 65 // Each "case" is responsible for iterate the parser to the next top | |
| 66 // level packet. | |
| 67 switch (field_type) { | |
| 68 case kRtcpSrCode: | |
| 69 HandleSenderReport(rtcp_parser); | |
| 70 break; | |
| 71 case kRtcpRrCode: | |
| 72 HandleReceiverReport(rtcp_parser); | |
| 73 break; | |
| 74 case kRtcpSdesCode: | |
| 75 HandleSDES(rtcp_parser); | |
| 76 break; | |
| 77 case kRtcpByeCode: | |
| 78 HandleBYE(rtcp_parser); | |
| 79 break; | |
| 80 case kRtcpXrCode: | |
| 81 HandleXr(rtcp_parser); | |
| 82 break; | |
| 83 case kRtcpGenericRtpFeedbackNackCode: | |
| 84 HandleNACK(rtcp_parser); | |
| 85 break; | |
| 86 case kRtcpGenericRtpFeedbackSrReqCode: | |
| 87 HandleSendReportRequest(rtcp_parser); | |
| 88 break; | |
| 89 case kRtcpPayloadSpecificPliCode: | |
| 90 HandlePLI(rtcp_parser); | |
| 91 break; | |
| 92 case kRtcpPayloadSpecificRpsiCode: | |
| 93 HandleRpsi(rtcp_parser); | |
| 94 break; | |
| 95 case kRtcpPayloadSpecificFirCode: | |
| 96 HandleFIR(rtcp_parser); | |
| 97 break; | |
| 98 case kRtcpPayloadSpecificAppCode: | |
| 99 HandlePayloadSpecificApp(rtcp_parser); | |
| 100 break; | |
| 101 case kRtcpApplicationSpecificCastReceiverLogCode: | |
| 102 HandleApplicationSpecificCastReceiverLog(rtcp_parser); | |
| 103 break; | |
| 104 case kRtcpPayloadSpecificRembCode: | |
| 105 case kRtcpPayloadSpecificRembItemCode: | |
| 106 case kRtcpPayloadSpecificCastCode: | |
| 107 case kRtcpPayloadSpecificCastNackItemCode: | |
| 108 case kRtcpApplicationSpecificCastReceiverLogFrameCode: | |
| 109 case kRtcpApplicationSpecificCastReceiverLogEventCode: | |
| 110 case kRtcpNotValidCode: | |
| 111 case kRtcpReportBlockItemCode: | |
| 112 case kRtcpSdesChunkCode: | |
| 113 case kRtcpGenericRtpFeedbackNackItemCode: | |
| 114 case kRtcpPayloadSpecificFirItemCode: | |
| 115 case kRtcpXrRrtrCode: | |
| 116 case kRtcpXrDlrrCode: | |
| 117 case kRtcpXrUnknownItemCode: | |
| 118 rtcp_parser->Iterate(); | |
| 119 NOTREACHED() << "Invalid state"; | |
| 120 break; | |
| 121 } | |
| 122 field_type = rtcp_parser->FieldType(); | |
| 123 } | |
| 124 } | |
| 125 | |
| 126 void RtcpReceiver::HandleSenderReport(RtcpParser* rtcp_parser) { | |
| 127 RtcpFieldTypes rtcp_field_type = rtcp_parser->FieldType(); | |
| 128 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 129 | |
| 130 DCHECK(rtcp_field_type == kRtcpSrCode) << "Invalid state"; | |
| 131 | |
| 132 // Synchronization source identifier for the originator of this SR packet. | |
| 133 uint32 remote_ssrc = rtcp_field.sender_report.sender_ssrc; | |
| 134 | |
| 135 VLOG(2) << "Cast RTCP received SR from SSRC " << remote_ssrc; | |
| 136 | |
| 137 if (remote_ssrc_ == remote_ssrc) { | |
| 138 transport::RtcpSenderInfo remote_sender_info; | |
| 139 remote_sender_info.ntp_seconds = | |
| 140 rtcp_field.sender_report.ntp_most_significant; | |
| 141 remote_sender_info.ntp_fraction = | |
| 142 rtcp_field.sender_report.ntp_least_significant; | |
| 143 remote_sender_info.rtp_timestamp = rtcp_field.sender_report.rtp_timestamp; | |
| 144 remote_sender_info.send_packet_count = | |
| 145 rtcp_field.sender_report.sender_packet_count; | |
| 146 remote_sender_info.send_octet_count = | |
| 147 rtcp_field.sender_report.sender_octet_count; | |
| 148 if (receiver_feedback_) { | |
| 149 receiver_feedback_->OnReceivedSenderReport(remote_sender_info); | |
| 150 } | |
| 151 } | |
| 152 rtcp_field_type = rtcp_parser->Iterate(); | |
| 153 while (rtcp_field_type == kRtcpReportBlockItemCode) { | |
| 154 HandleReportBlock(&rtcp_field, remote_ssrc); | |
| 155 rtcp_field_type = rtcp_parser->Iterate(); | |
| 156 } | |
| 157 } | |
| 158 | |
| 159 void RtcpReceiver::HandleReceiverReport(RtcpParser* rtcp_parser) { | |
| 160 RtcpFieldTypes rtcp_field_type = rtcp_parser->FieldType(); | |
| 161 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 162 | |
| 163 DCHECK(rtcp_field_type == kRtcpRrCode) << "Invalid state"; | |
| 164 | |
| 165 uint32 remote_ssrc = rtcp_field.receiver_report.sender_ssrc; | |
| 166 | |
| 167 VLOG(2) << "Cast RTCP received RR from SSRC " << remote_ssrc; | |
| 168 | |
| 169 rtcp_field_type = rtcp_parser->Iterate(); | |
| 170 while (rtcp_field_type == kRtcpReportBlockItemCode) { | |
| 171 HandleReportBlock(&rtcp_field, remote_ssrc); | |
| 172 rtcp_field_type = rtcp_parser->Iterate(); | |
| 173 } | |
| 174 } | |
| 175 | |
| 176 void RtcpReceiver::HandleReportBlock(const RtcpField* rtcp_field, | |
| 177 uint32 remote_ssrc) { | |
| 178 // This will be called once per report block in the Rtcp packet. | |
| 179 // We filter out all report blocks that are not for us. | |
| 180 // Each packet has max 31 RR blocks. | |
| 181 // | |
| 182 // We can calculate RTT if we send a send report and get a report block back. | |
| 183 | |
| 184 // |rtcp_field.ReportBlockItem.ssrc| is the ssrc identifier of the source to | |
| 185 // which the information in this reception report block pertains. | |
| 186 | |
| 187 const RtcpFieldReportBlockItem& rb = rtcp_field->report_block_item; | |
| 188 | |
| 189 // Filter out all report blocks that are not for us. | |
| 190 if (rb.ssrc != ssrc_) { | |
| 191 // This block is not for us ignore it. | |
| 192 return; | |
| 193 } | |
| 194 VLOG(2) << "Cast RTCP received RB from SSRC " << remote_ssrc; | |
| 195 | |
| 196 transport::RtcpReportBlock report_block; | |
| 197 report_block.remote_ssrc = remote_ssrc; | |
| 198 report_block.media_ssrc = rb.ssrc; | |
| 199 report_block.fraction_lost = rb.fraction_lost; | |
| 200 report_block.cumulative_lost = rb.cumulative_number_of_packets_lost; | |
| 201 report_block.extended_high_sequence_number = | |
| 202 rb.extended_highest_sequence_number; | |
| 203 report_block.jitter = rb.jitter; | |
| 204 report_block.last_sr = rb.last_sender_report; | |
| 205 report_block.delay_since_last_sr = rb.delay_last_sender_report; | |
| 206 | |
| 207 if (rtt_feedback_) { | |
| 208 rtt_feedback_->OnReceivedDelaySinceLastReport( | |
| 209 rb.ssrc, rb.last_sender_report, rb.delay_last_sender_report); | |
| 210 } | |
| 211 } | |
| 212 | |
| 213 void RtcpReceiver::HandleSDES(RtcpParser* rtcp_parser) { | |
| 214 RtcpFieldTypes field_type = rtcp_parser->Iterate(); | |
| 215 while (field_type == kRtcpSdesChunkCode) { | |
| 216 HandleSDESChunk(rtcp_parser); | |
| 217 field_type = rtcp_parser->Iterate(); | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 void RtcpReceiver::HandleSDESChunk(RtcpParser* rtcp_parser) { | |
| 222 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 223 VLOG(2) << "Cast RTCP received SDES with cname " << rtcp_field.c_name.name; | |
| 224 } | |
| 225 | |
| 226 void RtcpReceiver::HandleXr(RtcpParser* rtcp_parser) { | |
| 227 RtcpFieldTypes rtcp_field_type = rtcp_parser->FieldType(); | |
| 228 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 229 | |
| 230 DCHECK(rtcp_field_type == kRtcpXrCode) << "Invalid state"; | |
| 231 | |
| 232 uint32 remote_ssrc = rtcp_field.extended_report.sender_ssrc; | |
| 233 rtcp_field_type = rtcp_parser->Iterate(); | |
| 234 | |
| 235 while (rtcp_field_type == kRtcpXrDlrrCode || | |
| 236 rtcp_field_type == kRtcpXrRrtrCode || | |
| 237 rtcp_field_type == kRtcpXrUnknownItemCode) { | |
| 238 if (rtcp_field_type == kRtcpXrRrtrCode) { | |
| 239 HandleRrtr(rtcp_parser, remote_ssrc); | |
| 240 } else if (rtcp_field_type == kRtcpXrDlrrCode) { | |
| 241 HandleDlrr(rtcp_parser); | |
| 242 } | |
| 243 rtcp_field_type = rtcp_parser->Iterate(); | |
| 244 } | |
| 245 } | |
| 246 | |
| 247 void RtcpReceiver::HandleRrtr(RtcpParser* rtcp_parser, uint32 remote_ssrc) { | |
| 248 if (remote_ssrc_ != remote_ssrc) { | |
| 249 // Not to us. | |
| 250 return; | |
| 251 } | |
| 252 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 253 RtcpReceiverReferenceTimeReport remote_time_report; | |
| 254 remote_time_report.remote_ssrc = remote_ssrc; | |
| 255 remote_time_report.ntp_seconds = rtcp_field.rrtr.ntp_most_significant; | |
| 256 remote_time_report.ntp_fraction = rtcp_field.rrtr.ntp_least_significant; | |
| 257 | |
| 258 if (receiver_feedback_) { | |
| 259 receiver_feedback_->OnReceiverReferenceTimeReport(remote_time_report); | |
| 260 } | |
| 261 } | |
| 262 | |
| 263 void RtcpReceiver::HandleDlrr(RtcpParser* rtcp_parser) { | |
| 264 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 265 if (remote_ssrc_ != rtcp_field.dlrr.receivers_ssrc) { | |
| 266 // Not to us. | |
| 267 return; | |
| 268 } | |
| 269 if (rtt_feedback_) { | |
| 270 rtt_feedback_->OnReceivedDelaySinceLastReport( | |
| 271 rtcp_field.dlrr.receivers_ssrc, | |
| 272 rtcp_field.dlrr.last_receiver_report, | |
| 273 rtcp_field.dlrr.delay_last_receiver_report); | |
| 274 } | |
| 275 } | |
| 276 | |
| 277 void RtcpReceiver::HandleNACK(RtcpParser* rtcp_parser) { | |
| 278 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 279 if (ssrc_ != rtcp_field.nack.media_ssrc) { | |
| 280 RtcpFieldTypes field_type; | |
| 281 // Message not to us. Iterate until we have passed this message. | |
| 282 do { | |
| 283 field_type = rtcp_parser->Iterate(); | |
| 284 } while (field_type == kRtcpGenericRtpFeedbackNackItemCode); | |
| 285 return; | |
| 286 } | |
| 287 std::list<uint16> nackSequenceNumbers; | |
| 288 | |
| 289 RtcpFieldTypes field_type = rtcp_parser->Iterate(); | |
| 290 while (field_type == kRtcpGenericRtpFeedbackNackItemCode) { | |
| 291 HandleNACKItem(&rtcp_field, &nackSequenceNumbers); | |
| 292 field_type = rtcp_parser->Iterate(); | |
| 293 } | |
| 294 } | |
| 295 | |
| 296 void RtcpReceiver::HandleNACKItem(const RtcpField* rtcp_field, | |
| 297 std::list<uint16>* nack_sequence_numbers) { | |
| 298 nack_sequence_numbers->push_back(rtcp_field->nack_item.packet_id); | |
| 299 | |
| 300 uint16 bitmask = rtcp_field->nack_item.bitmask; | |
| 301 if (bitmask) { | |
| 302 for (int i = 1; i <= 16; ++i) { | |
| 303 if (bitmask & 1) { | |
| 304 nack_sequence_numbers->push_back(rtcp_field->nack_item.packet_id + i); | |
| 305 } | |
| 306 bitmask = bitmask >> 1; | |
| 307 } | |
| 308 } | |
| 309 } | |
| 310 | |
| 311 void RtcpReceiver::HandleBYE(RtcpParser* rtcp_parser) { | |
| 312 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 313 uint32 remote_ssrc = rtcp_field.bye.sender_ssrc; | |
| 314 if (remote_ssrc_ == remote_ssrc) { | |
| 315 VLOG(2) << "Cast RTCP received BYE from SSRC " << remote_ssrc; | |
| 316 } | |
| 317 rtcp_parser->Iterate(); | |
| 318 } | |
| 319 | |
| 320 void RtcpReceiver::HandlePLI(RtcpParser* rtcp_parser) { | |
| 321 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 322 if (ssrc_ == rtcp_field.pli.media_ssrc) { | |
| 323 // Received a signal that we need to send a new key frame. | |
| 324 VLOG(2) << "Cast RTCP received PLI on our SSRC " << ssrc_; | |
| 325 } | |
| 326 rtcp_parser->Iterate(); | |
| 327 } | |
| 328 | |
| 329 void RtcpReceiver::HandleSendReportRequest(RtcpParser* rtcp_parser) { | |
| 330 if (receiver_feedback_) { | |
| 331 receiver_feedback_->OnReceivedSendReportRequest(); | |
| 332 } | |
| 333 rtcp_parser->Iterate(); | |
| 334 } | |
| 335 | |
| 336 void RtcpReceiver::HandleRpsi(RtcpParser* rtcp_parser) { | |
| 337 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 338 if (rtcp_parser->Iterate() != kRtcpPayloadSpecificRpsiCode) { | |
| 339 return; | |
| 340 } | |
| 341 if (rtcp_field.rpsi.number_of_valid_bits % 8 != 0) { | |
| 342 // Continue | |
| 343 return; | |
| 344 } | |
| 345 uint64 rpsi_picture_id = 0; | |
| 346 | |
| 347 // Convert native_bit_string to rpsi_picture_id | |
| 348 uint8 bytes = rtcp_field.rpsi.number_of_valid_bits / 8; | |
| 349 for (uint8 n = 0; n < (bytes - 1); ++n) { | |
| 350 rpsi_picture_id += (rtcp_field.rpsi.native_bit_string[n] & 0x7f); | |
| 351 rpsi_picture_id <<= 7; // Prepare next. | |
| 352 } | |
| 353 rpsi_picture_id += (rtcp_field.rpsi.native_bit_string[bytes - 1] & 0x7f); | |
| 354 | |
| 355 VLOG(2) << "Cast RTCP received RPSI with picture_id " << rpsi_picture_id; | |
| 356 } | |
| 357 | |
| 358 void RtcpReceiver::HandlePayloadSpecificApp(RtcpParser* rtcp_parser) { | |
| 359 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 360 uint32 remote_ssrc = rtcp_field.application_specific.sender_ssrc; | |
| 361 if (remote_ssrc_ != remote_ssrc) { | |
| 362 // Message not to us. Iterate until we have passed this message. | |
| 363 RtcpFieldTypes field_type; | |
| 364 do { | |
| 365 field_type = rtcp_parser->Iterate(); | |
| 366 } while (field_type == kRtcpPayloadSpecificRembCode || | |
| 367 field_type == kRtcpPayloadSpecificRembItemCode || | |
| 368 field_type == kRtcpPayloadSpecificCastCode || | |
| 369 field_type == kRtcpPayloadSpecificCastNackItemCode); | |
| 370 return; | |
| 371 } | |
| 372 | |
| 373 RtcpFieldTypes packet_type = rtcp_parser->Iterate(); | |
| 374 switch (packet_type) { | |
| 375 case kRtcpPayloadSpecificRembCode: | |
| 376 packet_type = rtcp_parser->Iterate(); | |
| 377 if (packet_type == kRtcpPayloadSpecificRembItemCode) { | |
| 378 HandlePayloadSpecificRembItem(rtcp_parser); | |
| 379 rtcp_parser->Iterate(); | |
| 380 } | |
| 381 break; | |
| 382 case kRtcpPayloadSpecificCastCode: | |
| 383 packet_type = rtcp_parser->Iterate(); | |
| 384 if (packet_type == kRtcpPayloadSpecificCastCode) { | |
| 385 HandlePayloadSpecificCastItem(rtcp_parser); | |
| 386 } | |
| 387 break; | |
| 388 default: | |
| 389 return; | |
| 390 } | |
| 391 } | |
| 392 | |
| 393 void RtcpReceiver::HandlePayloadSpecificRembItem(RtcpParser* rtcp_parser) { | |
| 394 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 395 | |
| 396 for (int i = 0; i < rtcp_field.remb_item.number_of_ssrcs; ++i) { | |
| 397 if (rtcp_field.remb_item.ssrcs[i] == ssrc_) { | |
| 398 // Found matching ssrc. | |
| 399 VLOG(2) << "Cast RTCP received REMB with received_bitrate " | |
| 400 << rtcp_field.remb_item.bitrate; | |
| 401 return; | |
| 402 } | |
| 403 } | |
| 404 } | |
| 405 | |
| 406 void RtcpReceiver::HandleApplicationSpecificCastReceiverLog( | |
| 407 RtcpParser* rtcp_parser) { | |
| 408 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 409 | |
| 410 uint32 remote_ssrc = rtcp_field.cast_receiver_log.sender_ssrc; | |
| 411 if (remote_ssrc_ != remote_ssrc) { | |
| 412 // Message not to us. Iterate until we have passed this message. | |
| 413 RtcpFieldTypes field_type; | |
| 414 do { | |
| 415 field_type = rtcp_parser->Iterate(); | |
| 416 } while (field_type == kRtcpApplicationSpecificCastReceiverLogFrameCode || | |
| 417 field_type == kRtcpApplicationSpecificCastReceiverLogEventCode); | |
| 418 return; | |
| 419 } | |
| 420 RtcpReceiverLogMessage receiver_log; | |
| 421 RtcpFieldTypes field_type = rtcp_parser->Iterate(); | |
| 422 while (field_type == kRtcpApplicationSpecificCastReceiverLogFrameCode) { | |
| 423 RtcpReceiverFrameLogMessage frame_log( | |
| 424 rtcp_field.cast_receiver_log.rtp_timestamp); | |
| 425 | |
| 426 field_type = rtcp_parser->Iterate(); | |
| 427 while (field_type == kRtcpApplicationSpecificCastReceiverLogEventCode) { | |
| 428 HandleApplicationSpecificCastReceiverEventLog( | |
| 429 rtcp_field.cast_receiver_log.rtp_timestamp, | |
| 430 rtcp_parser, | |
| 431 &frame_log.event_log_messages_); | |
| 432 field_type = rtcp_parser->Iterate(); | |
| 433 } | |
| 434 | |
| 435 if (!frame_log.event_log_messages_.empty()) | |
| 436 receiver_log.push_back(frame_log); | |
| 437 } | |
| 438 | |
| 439 if (receiver_feedback_ && !receiver_log.empty()) { | |
| 440 receiver_feedback_->OnReceivedReceiverLog(receiver_log); | |
| 441 } | |
| 442 } | |
| 443 | |
| 444 void RtcpReceiver::HandleApplicationSpecificCastReceiverEventLog( | |
| 445 uint32 frame_rtp_timestamp, | |
| 446 RtcpParser* rtcp_parser, | |
| 447 RtcpReceiverEventLogMessages* event_log_messages) { | |
| 448 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 449 | |
| 450 const uint8 event = rtcp_field.cast_receiver_log.event; | |
| 451 const CastLoggingEvent event_type = TranslateToLogEventFromWireFormat(event); | |
| 452 uint16 packet_id = event_type == PACKET_RECEIVED ? | |
| 453 rtcp_field.cast_receiver_log.delay_delta_or_packet_id.packet_id : 0; | |
| 454 const base::TimeTicks event_timestamp = | |
| 455 base::TimeTicks() + | |
| 456 base::TimeDelta::FromMilliseconds( | |
| 457 rtcp_field.cast_receiver_log.event_timestamp_base + | |
| 458 rtcp_field.cast_receiver_log.event_timestamp_delta); | |
| 459 | |
| 460 // The following code checks to see if we have already seen this event. | |
| 461 // The algorithm works by maintaining a sliding window of events. We have | |
| 462 // a queue and a set of events. We enqueue every new event and insert it | |
| 463 // into the set. When the queue becomes too big we remove the oldest event | |
| 464 // from both the queue and the set. | |
| 465 ReceiverEventKey key = | |
| 466 GetReceiverEventKey( | |
| 467 frame_rtp_timestamp, event_timestamp, event, packet_id); | |
| 468 if (receiver_event_key_set_.find(key) != receiver_event_key_set_.end()) { | |
| 469 return; | |
| 470 } else { | |
| 471 receiver_event_key_set_.insert(key); | |
| 472 receiver_event_key_queue_.push(key); | |
| 473 | |
| 474 if (receiver_event_key_queue_.size() > receiver_event_history_size_) { | |
| 475 const ReceiverEventKey oldest_key = receiver_event_key_queue_.front(); | |
| 476 receiver_event_key_queue_.pop(); | |
| 477 receiver_event_key_set_.erase(oldest_key); | |
| 478 } | |
| 479 } | |
| 480 | |
| 481 RtcpReceiverEventLogMessage event_log; | |
| 482 event_log.type = event_type; | |
| 483 event_log.event_timestamp = event_timestamp; | |
| 484 event_log.delay_delta = base::TimeDelta::FromMilliseconds( | |
| 485 rtcp_field.cast_receiver_log.delay_delta_or_packet_id.delay_delta); | |
| 486 event_log.packet_id = | |
| 487 rtcp_field.cast_receiver_log.delay_delta_or_packet_id.packet_id; | |
| 488 event_log_messages->push_back(event_log); | |
| 489 } | |
| 490 | |
| 491 void RtcpReceiver::HandlePayloadSpecificCastItem(RtcpParser* rtcp_parser) { | |
| 492 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 493 RtcpCastMessage cast_message(remote_ssrc_); | |
| 494 cast_message.ack_frame_id_ = ack_frame_id_wrap_helper_.MapTo32bitsFrameId( | |
| 495 rtcp_field.cast_item.last_frame_id); | |
| 496 cast_message.target_delay_ms_ = rtcp_field.cast_item.target_delay_ms; | |
| 497 | |
| 498 RtcpFieldTypes packet_type = rtcp_parser->Iterate(); | |
| 499 while (packet_type == kRtcpPayloadSpecificCastNackItemCode) { | |
| 500 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 501 HandlePayloadSpecificCastNackItem( | |
| 502 &rtcp_field, &cast_message.missing_frames_and_packets_); | |
| 503 packet_type = rtcp_parser->Iterate(); | |
| 504 } | |
| 505 if (sender_feedback_) { | |
| 506 sender_feedback_->OnReceivedCastFeedback(cast_message); | |
| 507 } | |
| 508 } | |
| 509 | |
| 510 void RtcpReceiver::HandlePayloadSpecificCastNackItem( | |
| 511 const RtcpField* rtcp_field, | |
| 512 MissingFramesAndPacketsMap* missing_frames_and_packets) { | |
| 513 | |
| 514 MissingFramesAndPacketsMap::iterator frame_it = | |
| 515 missing_frames_and_packets->find(rtcp_field->cast_nack_item.frame_id); | |
| 516 | |
| 517 if (frame_it == missing_frames_and_packets->end()) { | |
| 518 // First missing packet in a frame. | |
| 519 PacketIdSet empty_set; | |
| 520 std::pair<MissingFramesAndPacketsMap::iterator, bool> ret = | |
| 521 missing_frames_and_packets->insert(std::pair<uint8, PacketIdSet>( | |
| 522 rtcp_field->cast_nack_item.frame_id, empty_set)); | |
| 523 frame_it = ret.first; | |
| 524 DCHECK(frame_it != missing_frames_and_packets->end()) << "Invalid state"; | |
| 525 } | |
| 526 uint16 packet_id = rtcp_field->cast_nack_item.packet_id; | |
| 527 frame_it->second.insert(packet_id); | |
| 528 | |
| 529 if (packet_id == kRtcpCastAllPacketsLost) { | |
| 530 // Special case all packets in a frame is missing. | |
| 531 return; | |
| 532 } | |
| 533 uint8 bitmask = rtcp_field->cast_nack_item.bitmask; | |
| 534 | |
| 535 if (bitmask) { | |
| 536 for (int i = 1; i <= 8; ++i) { | |
| 537 if (bitmask & 1) { | |
| 538 frame_it->second.insert(packet_id + i); | |
| 539 } | |
| 540 bitmask = bitmask >> 1; | |
| 541 } | |
| 542 } | |
| 543 } | |
| 544 | |
| 545 void RtcpReceiver::HandleFIR(RtcpParser* rtcp_parser) { | |
| 546 const RtcpField& rtcp_field = rtcp_parser->Field(); | |
| 547 | |
| 548 RtcpFieldTypes field_type = rtcp_parser->Iterate(); | |
| 549 while (field_type == kRtcpPayloadSpecificFirItemCode) { | |
| 550 HandleFIRItem(&rtcp_field); | |
| 551 field_type = rtcp_parser->Iterate(); | |
| 552 } | |
| 553 } | |
| 554 | |
| 555 void RtcpReceiver::HandleFIRItem(const RtcpField* rtcp_field) { | |
| 556 // Is it our sender that is requested to generate a new keyframe. | |
| 557 if (ssrc_ != rtcp_field->fir_item.ssrc) | |
| 558 return; | |
| 559 | |
| 560 VLOG(2) << "Cast RTCP received FIR on our SSRC " << ssrc_; | |
| 561 } | |
| 562 | |
| 563 } // namespace cast | |
| 564 } // namespace media | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 388663003:
Cast: Reshuffle files under media/cast (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src