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| 1 /* | 1 /* |
| 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ | 9 */ |
| 10 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_PACKET_H_ | 10 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_PACKET_H_ |
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| 23 | 23 |
| 24 namespace rtp { | 24 namespace rtp { |
| 25 class Packet { | 25 class Packet { |
| 26 public: | 26 public: |
| 27 using ExtensionType = RTPExtensionType; | 27 using ExtensionType = RTPExtensionType; |
| 28 using ExtensionManager = RtpHeaderExtensionMap; | 28 using ExtensionManager = RtpHeaderExtensionMap; |
| 29 static constexpr size_t kMaxExtensionHeaders = 14; | 29 static constexpr size_t kMaxExtensionHeaders = 14; |
| 30 static constexpr int kMinExtensionId = 1; | 30 static constexpr int kMinExtensionId = 1; |
| 31 static constexpr int kMaxExtensionId = 14; | 31 static constexpr int kMaxExtensionId = 14; |
| 32 | 32 |
| 33 // |extensions| required for SetExtension/ReserveExtension functions during |
| 34 // packet creating and used if available in Parse function. |
| 35 // Adding and getting extensions will fail until |extensions| is |
| 36 // provided via constructor or IdentifyExtensions function. |
| 37 Packet(); |
| 38 explicit Packet(const ExtensionManager* extensions); |
| 39 Packet(const Packet&); |
| 40 Packet(const ExtensionManager* extensions, size_t capacity); |
| 41 ~Packet(); |
| 42 |
| 43 Packet& operator=(const Packet&) = default; |
| 44 |
| 33 // Parse and copy given buffer into Packet. | 45 // Parse and copy given buffer into Packet. |
| 34 bool Parse(const uint8_t* buffer, size_t size); | 46 bool Parse(const uint8_t* buffer, size_t size); |
| 35 bool Parse(rtc::ArrayView<const uint8_t> packet); | 47 bool Parse(rtc::ArrayView<const uint8_t> packet); |
| 36 | 48 |
| 37 // Parse and move given buffer into Packet. | 49 // Parse and move given buffer into Packet. |
| 38 bool Parse(rtc::CopyOnWriteBuffer packet); | 50 bool Parse(rtc::CopyOnWriteBuffer packet); |
| 39 | 51 |
| 40 // Maps extensions id to their types. | 52 // Maps extensions id to their types. |
| 41 void IdentifyExtensions(const ExtensionManager& extensions); | 53 void IdentifyExtensions(const ExtensionManager& extensions); |
| 42 | 54 |
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| 106 // Allocates and returns place to store rtp header extension. | 118 // Allocates and returns place to store rtp header extension. |
| 107 // Returns empty arrayview on failure. | 119 // Returns empty arrayview on failure. |
| 108 rtc::ArrayView<uint8_t> AllocateRawExtension(int id, size_t length); | 120 rtc::ArrayView<uint8_t> AllocateRawExtension(int id, size_t length); |
| 109 | 121 |
| 110 // Reserve size_bytes for payload. Returns nullptr on failure. | 122 // Reserve size_bytes for payload. Returns nullptr on failure. |
| 111 uint8_t* SetPayloadSize(size_t size_bytes); | 123 uint8_t* SetPayloadSize(size_t size_bytes); |
| 112 // Same as SetPayloadSize but doesn't guarantee to keep current payload. | 124 // Same as SetPayloadSize but doesn't guarantee to keep current payload. |
| 113 uint8_t* AllocatePayload(size_t size_bytes); | 125 uint8_t* AllocatePayload(size_t size_bytes); |
| 114 bool SetPadding(uint8_t size_bytes, Random* random); | 126 bool SetPadding(uint8_t size_bytes, Random* random); |
| 115 | 127 |
| 116 protected: | |
| 117 // |extensions| required for SetExtension/ReserveExtension functions during | |
| 118 // packet creating and used if available in Parse function. | |
| 119 // Adding and getting extensions will fail until |extensions| is | |
| 120 // provided via constructor or IdentifyExtensions function. | |
| 121 Packet(); | |
| 122 explicit Packet(const ExtensionManager* extensions); | |
| 123 Packet(const Packet&); | |
| 124 Packet(const ExtensionManager* extensions, size_t capacity); | |
| 125 ~Packet(); | |
| 126 | |
| 127 Packet& operator=(const Packet&) = default; | |
| 128 | |
| 129 private: | 128 private: |
| 130 struct ExtensionInfo { | 129 struct ExtensionInfo { |
| 131 ExtensionType type; | 130 ExtensionType type; |
| 132 uint16_t offset; | 131 uint16_t offset; |
| 133 uint8_t length; | 132 uint8_t length; |
| 134 }; | 133 }; |
| 135 | 134 |
| 136 // Helper function for Parse. Fill header fields using data in given buffer, | 135 // Helper function for Parse. Fill header fields using data in given buffer, |
| 137 // but does not touch packet own buffer, leaving packet in invalid state. | 136 // but does not touch packet own buffer, leaving packet in invalid state. |
| 138 bool ParseBuffer(const uint8_t* buffer, size_t size); | 137 bool ParseBuffer(const uint8_t* buffer, size_t size); |
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| 192 auto buffer = AllocateExtension(Extension::kId, Extension::kValueSizeBytes); | 191 auto buffer = AllocateExtension(Extension::kId, Extension::kValueSizeBytes); |
| 193 if (buffer.empty()) | 192 if (buffer.empty()) |
| 194 return false; | 193 return false; |
| 195 memset(buffer.data(), 0, Extension::kValueSizeBytes); | 194 memset(buffer.data(), 0, Extension::kValueSizeBytes); |
| 196 return true; | 195 return true; |
| 197 } | 196 } |
| 198 } // namespace rtp | 197 } // namespace rtp |
| 199 } // namespace webrtc | 198 } // namespace webrtc |
| 200 | 199 |
| 201 #endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_PACKET_H_ | 200 #endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_PACKET_H_ |
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