Introduce helpers to RtpSender to propagate RtpPacketToSend.

webrtc/modules/rtp_rtcp/source/rtp_sender.cc

 /*
  *  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.
  */
 
@@ skipping 1054 matching lines @@
 
   uint16_t len =
       BuildRtpHeaderExtension(header + rtp_header_length, marker_bit);
   if (len > 0) {
     header[0] |= 0x10;  // Set extension bit.
     rtp_header_length += len;
   }
   return rtp_header_length;
 }
 
+std::unique_ptr<RtpPacketToSend> RTPSender::AllocatePacket() const {
+  rtc::CritScope lock(&send_critsect_);
+  std::unique_ptr<RtpPacketToSend> packet(
+      new RtpPacketToSend(&rtp_header_extension_map_, max_payload_length_));
+  packet->SetSsrc(ssrc_);
+  packet->SetCsrcs(csrcs_);
+  // Reserve extensions, if registered, RtpSender set in SendToNetwork.
+  packet->ReserveExtension<AbsoluteSendTime>();
+  packet->ReserveExtension<TransmissionOffset>();
+  packet->ReserveExtension<TransportSequenceNumber>();
+  return packet;
+}
+
+bool RTPSender::AssignSequenceNumber(RtpPacketToSend* packet) {
+  rtc::CritScope lock(&send_critsect_);
+  if (!sending_media_)
+    return false;
+  RTC_DCHECK_EQ(packet->Ssrc(), ssrc_);
+  packet->SetSequenceNumber(sequence_number_++);
+
+  // Remember marker bit to determine if padding can be inserted with
+  // sequence number following |packet|.
+  last_packet_marker_bit_ = packet->Marker();
+  // Save timestamps to generate timestamp field and extensions for the padding.
+  last_rtp_timestamp_ = packet->Timestamp();
+  last_timestamp_time_ms_ = clock_->TimeInMilliseconds();
+  capture_time_ms_ = packet->capture_time_ms();
+  return true;
+}
+
 int32_t RTPSender::BuildRTPheader(uint8_t* data_buffer,
                                   int8_t payload_type,
                                   bool marker_bit,
                                   uint32_t capture_timestamp,
                                   int64_t capture_time_ms,
                                   bool timestamp_provided,
                                   bool inc_sequence_number) {
   return BuildRtpHeader(data_buffer, payload_type, marker_bit,
                         capture_timestamp, capture_time_ms);
 }
@@ skipping 636 matching lines @@
   rtc::CritScope lock(&send_critsect_);
 
   RtpState state;
   state.sequence_number = sequence_number_rtx_;
   state.start_timestamp = timestamp_offset_;
 
   return state;
 }
 
 }  // namespace webrtc