mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-13 22:00:47 +01:00
99a71f49c0
rtp_rtcp_format is lighter build target than rtc_media_base and a more natural place to keep rtp parsing functions. Bug: None Change-Id: Ibcb5661cc65edbdc89a63f3e411d7ad1218353cc Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226330 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34504}
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/*
|
|
* Copyright (c) 2021 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.
|
|
*/
|
|
|
|
#include "modules/rtp_rtcp/source/rtp_util.h"
|
|
|
|
#include <cstddef>
|
|
#include <cstdint>
|
|
|
|
#include "api/array_view.h"
|
|
#include "modules/rtp_rtcp/source/byte_io.h"
|
|
#include "rtc_base/checks.h"
|
|
|
|
namespace webrtc {
|
|
namespace {
|
|
|
|
constexpr uint8_t kRtpVersion = 2;
|
|
constexpr size_t kMinRtpPacketLen = 12;
|
|
constexpr size_t kMinRtcpPacketLen = 4;
|
|
|
|
bool HasCorrectRtpVersion(rtc::ArrayView<const uint8_t> packet) {
|
|
return packet[0] >> 6 == kRtpVersion;
|
|
}
|
|
|
|
// For additional details, see http://tools.ietf.org/html/rfc5761#section-4
|
|
bool PayloadTypeIsReservedForRtcp(uint8_t payload_type) {
|
|
return 64 <= payload_type && payload_type < 96;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
bool IsRtpPacket(rtc::ArrayView<const uint8_t> packet) {
|
|
return packet.size() >= kMinRtpPacketLen && HasCorrectRtpVersion(packet) &&
|
|
!PayloadTypeIsReservedForRtcp(packet[1] & 0x7F);
|
|
}
|
|
|
|
bool IsRtcpPacket(rtc::ArrayView<const uint8_t> packet) {
|
|
return packet.size() >= kMinRtcpPacketLen && HasCorrectRtpVersion(packet) &&
|
|
PayloadTypeIsReservedForRtcp(packet[1] & 0x7F);
|
|
}
|
|
|
|
int ParseRtpPayloadType(rtc::ArrayView<const uint8_t> rtp_packet) {
|
|
RTC_DCHECK(IsRtpPacket(rtp_packet));
|
|
return rtp_packet[1] & 0x7F;
|
|
}
|
|
|
|
uint16_t ParseRtpSequenceNumber(rtc::ArrayView<const uint8_t> rtp_packet) {
|
|
RTC_DCHECK(IsRtpPacket(rtp_packet));
|
|
return ByteReader<uint16_t>::ReadBigEndian(rtp_packet.data() + 2);
|
|
}
|
|
|
|
uint32_t ParseRtpSsrc(rtc::ArrayView<const uint8_t> rtp_packet) {
|
|
RTC_DCHECK(IsRtpPacket(rtp_packet));
|
|
return ByteReader<uint32_t>::ReadBigEndian(rtp_packet.data() + 8);
|
|
}
|
|
|
|
} // namespace webrtc
|