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edd2054562
This change fixes some inefficiencies and quirks in the code that originates in RtpTransport leading up to the demux. This work is in preparation for more refactoring of the Demux stage onwards. Bug: webrtc:10297 Change-Id: I7b8f00134657d62c722939618a55a91a2b6040bd Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/128220 Commit-Queue: Amit Hilbuch <amithi@webrtc.org> Reviewed-by: Steve Anton <steveanton@webrtc.org> Reviewed-by: Seth Hampson <shampson@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27185}
100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
/*
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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 MEDIA_BASE_RTP_UTILS_H_
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#define MEDIA_BASE_RTP_UTILS_H_
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#include "absl/strings/string_view.h"
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#include "api/array_view.h"
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#include "rtc_base/byte_order.h"
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#include "rtc_base/system/rtc_export.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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enum class RtpPacketType {
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kRtp,
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kRtcp,
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kUnknown,
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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(rtc::ArrayView<const char> packet);
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bool IsRtcpPacket(rtc::ArrayView<const char> packet);
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// Checks the packet header to determine if it can be an RTP or RTCP packet.
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RtpPacketType InferRtpPacketType(rtc::ArrayView<const char> packet);
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// True if |payload type| is 0-127.
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bool IsValidRtpPayloadType(int payload_type);
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// True if |size| is appropriate for the indicated packet type.
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bool IsValidRtpPacketSize(RtpPacketType packet_type, size_t size);
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// Returns "RTCP", "RTP" or "Unknown" according to |packet_type|.
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absl::string_view RtpPacketTypeToString(RtpPacketType packet_type);
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// Verifies that a packet has a valid RTP header.
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bool RTC_EXPORT 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 RTC_EXPORT
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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 // MEDIA_BASE_RTP_UTILS_H_
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