/* * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #ifndef MEDIA_BASE_RTP_UTILS_H_ #define MEDIA_BASE_RTP_UTILS_H_ #include "absl/strings/string_view.h" #include "api/array_view.h" #include "rtc_base/byte_order.h" #include "rtc_base/system/rtc_export.h" namespace rtc { struct PacketTimeUpdateParams; } // namespace rtc namespace cricket { const size_t kMinRtpPacketLen = 12; const size_t kMaxRtpPacketLen = 2048; const size_t kMinRtcpPacketLen = 4; 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. }; enum class RtpPacketType { kRtp, kRtcp, kUnknown, }; bool GetRtcpType(const void* data, size_t len, int* value); bool GetRtcpSsrc(const void* data, size_t len, uint32_t* value); // Checks the packet header to determine if it can be an RTP or RTCP packet. RtpPacketType InferRtpPacketType(rtc::ArrayView packet); // True if |payload type| is 0-127. bool IsValidRtpPayloadType(int payload_type); // True if `size` is appropriate for the indicated packet type. bool IsValidRtpPacketSize(RtpPacketType packet_type, size_t size); // Returns "RTCP", "RTP" or "Unknown" according to `packet_type`. absl::string_view RtpPacketTypeToString(RtpPacketType packet_type); // Verifies that a packet has a valid RTP header. bool RTC_EXPORT ValidateRtpHeader(const uint8_t* rtp, size_t length, size_t* header_length); // Helper method which updates the absolute send time extension if present. bool UpdateRtpAbsSendTimeExtension(uint8_t* rtp, size_t length, int extension_id, uint64_t time_us); // Applies specified `options` to the packet. It updates the absolute send time // extension header if it is present present then updates HMAC. bool RTC_EXPORT ApplyPacketOptions(uint8_t* data, size_t length, const rtc::PacketTimeUpdateParams& packet_time_params, uint64_t time_us); } // namespace cricket #endif // MEDIA_BASE_RTP_UTILS_H_