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/*
* 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<const char> 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_
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