Introduce helpers to RtpSender to propagate RtpPacketToSend.

webrtc/modules/rtp_rtcp/source/rtp_sender.h

 /*
  *  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 185 matching lines @@
 
   // RTX.
   void SetRtxStatus(int mode);
   int RtxStatus() const;
 
   uint32_t RtxSsrc() const;
   void SetRtxSsrc(uint32_t ssrc);
 
   void SetRtxPayloadType(int payload_type, int associated_payload_type);
 
+  // Create empty packet, fills ssrc, csrcs and reserve place for header
+  // extensions RtpSender updates before sending.
+  std::unique_ptr<RtpPacketToSend> AllocatePacket() const;
+  // Allocate sequence number for provided packet.
+  // Save packet's fields to generate padding that doesn't break media stream.
+  // Return false if sending was turned off.
+  bool AssignSequenceNumber(RtpPacketToSend* packet);
+
   // Functions wrapping RTPSenderInterface.
   int32_t BuildRTPheader(uint8_t* data_buffer,
                          int8_t payload_type,
                          bool marker_bit,
                          uint32_t capture_timestamp,
                          int64_t capture_time_ms,
                          bool timestamp_provided = true,
                          bool inc_sequence_number = true);
   int32_t BuildRtpHeader(uint8_t* data_buffer,
                          int8_t payload_type,
@@ skipping 203 matching lines @@
   std::map<int8_t, int8_t> rtx_payload_type_map_ GUARDED_BY(send_critsect_);
 
   RateLimiter* const retransmission_rate_limiter_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RTPSender);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_SENDER_H_