media/cast/net/rtp/rtp_parser.h

   1 // Copyright 2014 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 #ifndef MEDIA_CAST_NET_RTP_RTP_PARSER_H_
   6 #define MEDIA_CAST_NET_RTP_RTP_PARSER_H_
   7
   8 #include "media/cast/net/cast_transport_defines.h"
   9 #include "media/cast/net/rtp/rtp_receiver_defines.h"
  10
  11 namespace media {
  12 namespace cast {
  13
  14 // TODO(miu): RtpParser and RtpPacketizer should be consolidated into a single
  15 // module that handles all RTP/Cast packet serialization and deserialization
  16 // throughout the media/cast library.
  17 class RtpParser {
  18  public:
  19   RtpParser(uint32 expected_sender_ssrc, uint8 expected_payload_type);
  20
  21   virtual ~RtpParser();
  22
  23   // Parses the |packet|, expecting an RTP header along with a Cast header at
  24   // the beginning of the the RTP payload.  This method populates the structure
  25   // pointed to by |rtp_header| and sets the |payload_data| pointer and
  26   // |payload_size| to the memory region within |packet| containing the Cast
  27   // payload data.  Returns false if the data appears to be invalid, is not from
  28   // the expected sender (as identified by the SSRC field), or is not the
  29   // expected payload type.
  30   bool ParsePacket(const uint8* packet,
  31                    size_t length,
  32                    RtpCastHeader* rtp_header,
  33                    const uint8** payload_data,
  34                    size_t* payload_size);
  35
  36   static bool ParseSsrc(const uint8* packet, size_t length, uint32* ssrc);
  37
  38  private:
  39   const uint32 expected_sender_ssrc_;
  40   const uint8 expected_payload_type_;
  41   FrameIdWrapHelper frame_id_wrap_helper_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(RtpParser);
  44 };
  45
  46 }  // namespace cast
  47 }  // namespace media
  48
  49 #endif  // MEDIA_CAST_NET_RTP_RTP_PARSER_H_