1/*
2 * libjingle
3 * Copyright 2011 Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef TALK_MEDIA_BASE_RTPUTILS_H_
29#define TALK_MEDIA_BASE_RTPUTILS_H_
30
31#include "webrtc/base/byteorder.h"
32
33namespace cricket {
34
35const size_t kMinRtpPacketLen = 12;
36const size_t kMaxRtpPacketLen = 2048;
37const size_t kMinRtcpPacketLen = 4;
38
39struct RtpHeader {
40  int payload_type;
41  int seq_num;
42  uint32 timestamp;
43  uint32 ssrc;
44};
45
46enum RtcpTypes {
47  kRtcpTypeSR = 200,      // Sender report payload type.
48  kRtcpTypeRR = 201,      // Receiver report payload type.
49  kRtcpTypeSDES = 202,    // SDES payload type.
50  kRtcpTypeBye = 203,     // BYE payload type.
51  kRtcpTypeApp = 204,     // APP payload type.
52  kRtcpTypeRTPFB = 205,   // Transport layer Feedback message payload type.
53  kRtcpTypePSFB = 206,    // Payload-specific Feedback message payload type.
54};
55
56bool GetRtpVersion(const void* data, size_t len, int* version);
57bool GetRtpPayloadType(const void* data, size_t len, int* value);
58bool GetRtpSeqNum(const void* data, size_t len, int* value);
59bool GetRtpTimestamp(const void* data, size_t len, uint32* value);
60bool GetRtpSsrc(const void* data, size_t len, uint32* value);
61bool GetRtpHeaderLen(const void* data, size_t len, size_t* value);
62bool GetRtcpType(const void* data, size_t len, int* value);
63bool GetRtcpSsrc(const void* data, size_t len, uint32* value);
64bool GetRtpHeader(const void* data, size_t len, RtpHeader* header);
65
66// Assumes marker bit is 0.
67bool SetRtpHeaderFlags(
68    void* data, size_t len,
69    bool padding, bool extension, int csrc_count);
70bool SetRtpPayloadType(void* data, size_t len, int value);
71bool SetRtpSeqNum(void* data, size_t len, int value);
72bool SetRtpTimestamp(void* data, size_t len, uint32 value);
73bool SetRtpSsrc(void* data, size_t len, uint32 value);
74// Assumes version 2, no padding, no extensions, no csrcs.
75bool SetRtpHeader(void* data, size_t len, const RtpHeader& header);
76
77bool IsRtpPacket(const void* data, size_t len);
78}  // namespace cricket
79
80#endif  // TALK_MEDIA_BASE_RTPUTILS_H_
81