1 files changed, 80 insertions, 0 deletions
diff --git a/third_party/libwebrtc/media/base/rtp_utils.h b/third_party/libwebrtc/media/base/rtp_utils.h
new file mode 100644
index 0000000000..a501fd7af3
--- /dev/null
+++ b/third_party/libwebrtc/media/base/rtp_utils.h
@@ -0,0 +1,80 @@
+/*
+ *  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_