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1 /* | 1 /* |
2 * libjingle | 2 * libjingle |
3 * Copyright 2011 Google Inc. | 3 * Copyright 2011 Google Inc. |
4 * | 4 * |
5 * Redistribution and use in source and binary forms, with or without | 5 * Redistribution and use in source and binary forms, with or without |
6 * modification, are permitted provided that the following conditions are met: | 6 * modification, are permitted provided that the following conditions are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright notice, | 8 * 1. Redistributions of source code must retain the above copyright notice, |
9 * this list of conditions and the following disclaimer. | 9 * this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright notice, | 10 * 2. Redistributions in binary form must reproduce the above copyright notice, |
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34 static const size_t kRtpPayloadTypeOffset = 1; | 34 static const size_t kRtpPayloadTypeOffset = 1; |
35 static const size_t kRtpSeqNumOffset = 2; | 35 static const size_t kRtpSeqNumOffset = 2; |
36 static const size_t kRtpTimestampOffset = 4; | 36 static const size_t kRtpTimestampOffset = 4; |
37 static const size_t kRtpSsrcOffset = 8; | 37 static const size_t kRtpSsrcOffset = 8; |
38 static const size_t kRtcpPayloadTypeOffset = 1; | 38 static const size_t kRtcpPayloadTypeOffset = 1; |
39 | 39 |
40 bool GetUint8(const void* data, size_t offset, int* value) { | 40 bool GetUint8(const void* data, size_t offset, int* value) { |
41 if (!data || !value) { | 41 if (!data || !value) { |
42 return false; | 42 return false; |
43 } | 43 } |
44 *value = *(static_cast<const uint8*>(data) + offset); | 44 *value = *(static_cast<const uint8_t*>(data) + offset); |
45 return true; | 45 return true; |
46 } | 46 } |
47 | 47 |
48 bool GetUint16(const void* data, size_t offset, int* value) { | 48 bool GetUint16(const void* data, size_t offset, int* value) { |
49 if (!data || !value) { | 49 if (!data || !value) { |
50 return false; | 50 return false; |
51 } | 51 } |
52 *value = static_cast<int>( | 52 *value = static_cast<int>( |
53 rtc::GetBE16(static_cast<const uint8*>(data) + offset)); | 53 rtc::GetBE16(static_cast<const uint8_t*>(data) + offset)); |
54 return true; | 54 return true; |
55 } | 55 } |
56 | 56 |
57 bool GetUint32(const void* data, size_t offset, uint32* value) { | 57 bool GetUint32(const void* data, size_t offset, uint32_t* value) { |
58 if (!data || !value) { | 58 if (!data || !value) { |
59 return false; | 59 return false; |
60 } | 60 } |
61 *value = rtc::GetBE32(static_cast<const uint8*>(data) + offset); | 61 *value = rtc::GetBE32(static_cast<const uint8_t*>(data) + offset); |
62 return true; | 62 return true; |
63 } | 63 } |
64 | 64 |
65 bool SetUint8(void* data, size_t offset, uint8_t value) { | 65 bool SetUint8(void* data, size_t offset, uint8_t value) { |
66 if (!data) { | 66 if (!data) { |
67 return false; | 67 return false; |
68 } | 68 } |
69 rtc::Set8(data, offset, value); | 69 rtc::Set8(data, offset, value); |
70 return true; | 70 return true; |
71 } | 71 } |
72 | 72 |
73 bool SetUint16(void* data, size_t offset, uint16_t value) { | 73 bool SetUint16(void* data, size_t offset, uint16_t value) { |
74 if (!data) { | 74 if (!data) { |
75 return false; | 75 return false; |
76 } | 76 } |
77 rtc::SetBE16(static_cast<uint8*>(data) + offset, value); | 77 rtc::SetBE16(static_cast<uint8_t*>(data) + offset, value); |
78 return true; | 78 return true; |
79 } | 79 } |
80 | 80 |
81 bool SetUint32(void* data, size_t offset, uint32 value) { | 81 bool SetUint32(void* data, size_t offset, uint32_t value) { |
82 if (!data) { | 82 if (!data) { |
83 return false; | 83 return false; |
84 } | 84 } |
85 rtc::SetBE32(static_cast<uint8*>(data) + offset, value); | 85 rtc::SetBE32(static_cast<uint8_t*>(data) + offset, value); |
86 return true; | 86 return true; |
87 } | 87 } |
88 | 88 |
89 bool GetRtpFlags(const void* data, size_t len, int* value) { | 89 bool GetRtpFlags(const void* data, size_t len, int* value) { |
90 if (len < kMinRtpPacketLen) { | 90 if (len < kMinRtpPacketLen) { |
91 return false; | 91 return false; |
92 } | 92 } |
93 return GetUint8(data, kRtpFlagsOffset, value); | 93 return GetUint8(data, kRtpFlagsOffset, value); |
94 } | 94 } |
95 | 95 |
96 bool GetRtpPayloadType(const void* data, size_t len, int* value) { | 96 bool GetRtpPayloadType(const void* data, size_t len, int* value) { |
97 if (len < kMinRtpPacketLen) { | 97 if (len < kMinRtpPacketLen) { |
98 return false; | 98 return false; |
99 } | 99 } |
100 if (!GetUint8(data, kRtpPayloadTypeOffset, value)) { | 100 if (!GetUint8(data, kRtpPayloadTypeOffset, value)) { |
101 return false; | 101 return false; |
102 } | 102 } |
103 *value &= 0x7F; | 103 *value &= 0x7F; |
104 return true; | 104 return true; |
105 } | 105 } |
106 | 106 |
107 bool GetRtpSeqNum(const void* data, size_t len, int* value) { | 107 bool GetRtpSeqNum(const void* data, size_t len, int* value) { |
108 if (len < kMinRtpPacketLen) { | 108 if (len < kMinRtpPacketLen) { |
109 return false; | 109 return false; |
110 } | 110 } |
111 return GetUint16(data, kRtpSeqNumOffset, value); | 111 return GetUint16(data, kRtpSeqNumOffset, value); |
112 } | 112 } |
113 | 113 |
114 bool GetRtpTimestamp(const void* data, size_t len, uint32* value) { | 114 bool GetRtpTimestamp(const void* data, size_t len, uint32_t* value) { |
115 if (len < kMinRtpPacketLen) { | 115 if (len < kMinRtpPacketLen) { |
116 return false; | 116 return false; |
117 } | 117 } |
118 return GetUint32(data, kRtpTimestampOffset, value); | 118 return GetUint32(data, kRtpTimestampOffset, value); |
119 } | 119 } |
120 | 120 |
121 bool GetRtpSsrc(const void* data, size_t len, uint32* value) { | 121 bool GetRtpSsrc(const void* data, size_t len, uint32_t* value) { |
122 if (len < kMinRtpPacketLen) { | 122 if (len < kMinRtpPacketLen) { |
123 return false; | 123 return false; |
124 } | 124 } |
125 return GetUint32(data, kRtpSsrcOffset, value); | 125 return GetUint32(data, kRtpSsrcOffset, value); |
126 } | 126 } |
127 | 127 |
128 bool GetRtpHeaderLen(const void* data, size_t len, size_t* value) { | 128 bool GetRtpHeaderLen(const void* data, size_t len, size_t* value) { |
129 if (!data || len < kMinRtpPacketLen || !value) return false; | 129 if (!data || len < kMinRtpPacketLen || !value) return false; |
130 const uint8* header = static_cast<const uint8*>(data); | 130 const uint8_t* header = static_cast<const uint8_t*>(data); |
131 // Get base header size + length of CSRCs (not counting extension yet). | 131 // Get base header size + length of CSRCs (not counting extension yet). |
132 size_t header_size = kMinRtpPacketLen + (header[0] & 0xF) * sizeof(uint32); | 132 size_t header_size = kMinRtpPacketLen + (header[0] & 0xF) * sizeof(uint32_t); |
133 if (len < header_size) return false; | 133 if (len < header_size) return false; |
134 // If there's an extension, read and add in the extension size. | 134 // If there's an extension, read and add in the extension size. |
135 if (header[0] & 0x10) { | 135 if (header[0] & 0x10) { |
136 if (len < header_size + sizeof(uint32)) return false; | 136 if (len < header_size + sizeof(uint32_t)) |
137 header_size += ((rtc::GetBE16(header + header_size + 2) + 1) * | 137 return false; |
138 sizeof(uint32)); | 138 header_size += |
| 139 ((rtc::GetBE16(header + header_size + 2) + 1) * sizeof(uint32_t)); |
139 if (len < header_size) return false; | 140 if (len < header_size) return false; |
140 } | 141 } |
141 *value = header_size; | 142 *value = header_size; |
142 return true; | 143 return true; |
143 } | 144 } |
144 | 145 |
145 bool GetRtpHeader(const void* data, size_t len, RtpHeader* header) { | 146 bool GetRtpHeader(const void* data, size_t len, RtpHeader* header) { |
146 return (GetRtpPayloadType(data, len, &(header->payload_type)) && | 147 return (GetRtpPayloadType(data, len, &(header->payload_type)) && |
147 GetRtpSeqNum(data, len, &(header->seq_num)) && | 148 GetRtpSeqNum(data, len, &(header->seq_num)) && |
148 GetRtpTimestamp(data, len, &(header->timestamp)) && | 149 GetRtpTimestamp(data, len, &(header->timestamp)) && |
149 GetRtpSsrc(data, len, &(header->ssrc))); | 150 GetRtpSsrc(data, len, &(header->ssrc))); |
150 } | 151 } |
151 | 152 |
152 bool GetRtcpType(const void* data, size_t len, int* value) { | 153 bool GetRtcpType(const void* data, size_t len, int* value) { |
153 if (len < kMinRtcpPacketLen) { | 154 if (len < kMinRtcpPacketLen) { |
154 return false; | 155 return false; |
155 } | 156 } |
156 return GetUint8(data, kRtcpPayloadTypeOffset, value); | 157 return GetUint8(data, kRtcpPayloadTypeOffset, value); |
157 } | 158 } |
158 | 159 |
159 // This method returns SSRC first of RTCP packet, except if packet is SDES. | 160 // This method returns SSRC first of RTCP packet, except if packet is SDES. |
160 // TODO(mallinath) - Fully implement RFC 5506. This standard doesn't restrict | 161 // TODO(mallinath) - Fully implement RFC 5506. This standard doesn't restrict |
161 // to send non-compound packets only to feedback messages. | 162 // to send non-compound packets only to feedback messages. |
162 bool GetRtcpSsrc(const void* data, size_t len, uint32* value) { | 163 bool GetRtcpSsrc(const void* data, size_t len, uint32_t* value) { |
163 // Packet should be at least of 8 bytes, to get SSRC from a RTCP packet. | 164 // Packet should be at least of 8 bytes, to get SSRC from a RTCP packet. |
164 if (!data || len < kMinRtcpPacketLen + 4 || !value) return false; | 165 if (!data || len < kMinRtcpPacketLen + 4 || !value) return false; |
165 int pl_type; | 166 int pl_type; |
166 if (!GetRtcpType(data, len, &pl_type)) return false; | 167 if (!GetRtcpType(data, len, &pl_type)) return false; |
167 // SDES packet parsing is not supported. | 168 // SDES packet parsing is not supported. |
168 if (pl_type == kRtcpTypeSDES) return false; | 169 if (pl_type == kRtcpTypeSDES) return false; |
169 *value = rtc::GetBE32(static_cast<const uint8*>(data) + 4); | 170 *value = rtc::GetBE32(static_cast<const uint8_t*>(data) + 4); |
170 return true; | 171 return true; |
171 } | 172 } |
172 | 173 |
173 bool SetRtpSsrc(void* data, size_t len, uint32 value) { | 174 bool SetRtpSsrc(void* data, size_t len, uint32_t value) { |
174 return SetUint32(data, kRtpSsrcOffset, value); | 175 return SetUint32(data, kRtpSsrcOffset, value); |
175 } | 176 } |
176 | 177 |
177 // Assumes version 2, no padding, no extensions, no csrcs. | 178 // Assumes version 2, no padding, no extensions, no csrcs. |
178 bool SetRtpHeader(void* data, size_t len, const RtpHeader& header) { | 179 bool SetRtpHeader(void* data, size_t len, const RtpHeader& header) { |
179 if (!IsValidRtpPayloadType(header.payload_type) || | 180 if (!IsValidRtpPayloadType(header.payload_type) || |
180 header.seq_num < 0 || header.seq_num > UINT16_MAX) { | 181 header.seq_num < 0 || header.seq_num > UINT16_MAX) { |
181 return false; | 182 return false; |
182 } | 183 } |
183 return (SetUint8(data, kRtpFlagsOffset, kRtpVersion << 6) && | 184 return (SetUint8(data, kRtpFlagsOffset, kRtpVersion << 6) && |
184 SetUint8(data, kRtpPayloadTypeOffset, header.payload_type & 0x7F) && | 185 SetUint8(data, kRtpPayloadTypeOffset, header.payload_type & 0x7F) && |
185 SetUint16(data, kRtpSeqNumOffset, | 186 SetUint16(data, kRtpSeqNumOffset, |
186 static_cast<uint16_t>(header.seq_num)) && | 187 static_cast<uint16_t>(header.seq_num)) && |
187 SetUint32(data, kRtpTimestampOffset, header.timestamp) && | 188 SetUint32(data, kRtpTimestampOffset, header.timestamp) && |
188 SetRtpSsrc(data, len, header.ssrc)); | 189 SetRtpSsrc(data, len, header.ssrc)); |
189 } | 190 } |
190 | 191 |
191 bool IsRtpPacket(const void* data, size_t len) { | 192 bool IsRtpPacket(const void* data, size_t len) { |
192 if (len < kMinRtpPacketLen) | 193 if (len < kMinRtpPacketLen) |
193 return false; | 194 return false; |
194 | 195 |
195 return (static_cast<const uint8*>(data)[0] >> 6) == kRtpVersion; | 196 return (static_cast<const uint8_t*>(data)[0] >> 6) == kRtpVersion; |
196 } | 197 } |
197 | 198 |
198 bool IsValidRtpPayloadType(int payload_type) { | 199 bool IsValidRtpPayloadType(int payload_type) { |
199 return payload_type >= 0 && payload_type <= 127; | 200 return payload_type >= 0 && payload_type <= 127; |
200 } | 201 } |
201 | 202 |
202 } // namespace cricket | 203 } // namespace cricket |
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