83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
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/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MEDIA_BASE_RTPUTILS_H_
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#define WEBRTC_MEDIA_BASE_RTPUTILS_H_
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#include "webrtc/base/byteorder.h"
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namespace rtc {
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struct PacketTimeUpdateParams;
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} // namespace rtc
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namespace cricket {
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const size_t kMinRtpPacketLen = 12;
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const size_t kMaxRtpPacketLen = 2048;
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const size_t kMinRtcpPacketLen = 4;
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struct RtpHeader {
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int payload_type;
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int seq_num;
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uint32_t timestamp;
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uint32_t ssrc;
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};
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enum RtcpTypes {
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kRtcpTypeSR = 200, // Sender report payload type.
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kRtcpTypeRR = 201, // Receiver report payload type.
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kRtcpTypeSDES = 202, // SDES payload type.
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kRtcpTypeBye = 203, // BYE payload type.
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kRtcpTypeApp = 204, // APP payload type.
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kRtcpTypeRTPFB = 205, // Transport layer Feedback message payload type.
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kRtcpTypePSFB = 206, // Payload-specific Feedback message payload type.
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};
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bool GetRtpPayloadType(const void* data, size_t len, int* value);
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bool GetRtpSeqNum(const void* data, size_t len, int* value);
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bool GetRtpTimestamp(const void* data, size_t len, uint32_t* value);
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bool GetRtpSsrc(const void* data, size_t len, uint32_t* value);
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bool GetRtpHeaderLen(const void* data, size_t len, size_t* value);
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bool GetRtcpType(const void* data, size_t len, int* value);
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bool GetRtcpSsrc(const void* data, size_t len, uint32_t* value);
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bool GetRtpHeader(const void* data, size_t len, RtpHeader* header);
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bool SetRtpSsrc(void* data, size_t len, uint32_t value);
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// Assumes version 2, no padding, no extensions, no csrcs.
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bool SetRtpHeader(void* data, size_t len, const RtpHeader& header);
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bool IsRtpPacket(const void* data, size_t len);
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// True if |payload type| is 0-127.
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bool IsValidRtpPayloadType(int payload_type);
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// Verifies that a packet has a valid RTP header.
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bool ValidateRtpHeader(const uint8_t* rtp,
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size_t length,
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size_t* header_length);
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// Helper method which updates the absolute send time extension if present.
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bool UpdateRtpAbsSendTimeExtension(uint8_t* rtp,
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size_t length,
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int extension_id,
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uint64_t time_us);
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// Applies specified |options| to the packet. It updates the absolute send time
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// extension header if it is present present then updates HMAC.
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bool ApplyPacketOptions(uint8_t* data,
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size_t length,
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const rtc::PacketTimeUpdateParams& packet_time_params,
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uint64_t time_us);
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} // namespace cricket
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#endif // WEBRTC_MEDIA_BASE_RTPUTILS_H_
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