text: /*
   * libjingle
   * Copyright 2011 Google Inc.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *  1. Redistributions of source code must retain the above copyright notice,
   *     this list of conditions and the following disclaimer.
   *  2. Redistributions in binary form must reproduce the above copyright notice,
   *     this list of conditions and the following disclaimer in the documentation
   *     and/or other materials provided with the distribution.
   *  3. The name of the author may not be used to endorse or promote products
   *     derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
   * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef TALK_MEDIA_BASE_RTPUTILS_H_
  #define TALK_MEDIA_BASE_RTPUTILS_H_
  
  #include "talk/base/byteorder.h"
  
  namespace cricket {
  
  const size_t kMinRtpPacketLen = 12;
  const size_t kMaxRtpPacketLen = 2048;
  const size_t kMinRtcpPacketLen = 4;
  
  struct RtpHeader {
    int payload_type;
    int seq_num;
    uint32 timestamp;
    uint32 ssrc;
  };
  
  enum RtcpTypes {
    kRtcpTypeSR = 200,      // Sender report payload type.
    kRtcpTypeRR = 201,      // Receiver report payload type.
    kRtcpTypeSDES = 202,    // SDES payload type.
    kRtcpTypeBye = 203,     // BYE payload type.
    kRtcpTypeApp = 204,     // APP payload type.
    kRtcpTypeRTPFB = 205,   // Transport layer Feedback message payload type.
    kRtcpTypePSFB = 206,    // Payload-specific Feedback message payload type.
  };
  
  bool GetRtpPayloadType(const void* data, size_t len, int* value);
  bool GetRtpSeqNum(const void* data, size_t len, int* value);
  bool GetRtpTimestamp(const void* data, size_t len, uint32* value);
  bool GetRtpSsrc(const void* data, size_t len, uint32* value);
  bool GetRtpHeaderLen(const void* data, size_t len, size_t* value);
  bool GetRtcpType(const void* data, size_t len, int* value);
  bool GetRtcpSsrc(const void* data, size_t len, uint32* value);
  bool GetRtpHeader(const void* data, size_t len, RtpHeader* header);
  
  // Assumes marker bit is 0.
  bool SetRtpHeaderFlags(
      void* data, size_t len,
      bool padding, bool extension, int csrc_count);
  bool SetRtpPayloadType(void* data, size_t len, int value);
  bool SetRtpSeqNum(void* data, size_t len, int value);
  bool SetRtpTimestamp(void* data, size_t len, uint32 value);
  bool SetRtpSsrc(void* data, size_t len, uint32 value);
  // Assumes version 2, no padding, no extensions, no csrcs.
  bool SetRtpHeader(void* data, size_t len, const RtpHeader& header);
  
  }  // namespace cricket
  
  #endif  // TALK_MEDIA_BASE_RTPUTILS_H_
  