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+/*
+ *  Copyright 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.
+ */
+
+// This file contain functions for parsing and serializing SDP messages.
+// Related RFC/draft including:
+// * RFC 4566 - SDP
+// * RFC 5245 - ICE
+// * RFC 3388 - Grouping of Media Lines in SDP
+// * RFC 4568 - SDP Security Descriptions for Media Streams
+// * draft-lennox-mmusic-sdp-source-selection-02 -
+//   Mechanisms for Media Source Selection in SDP
+
+#ifndef PC_WEBRTC_SDP_H_
+#define PC_WEBRTC_SDP_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "api/candidate.h"
+#include "api/jsep.h"
+#include "api/jsep_ice_candidate.h"
+#include "api/jsep_session_description.h"
+#include "media/base/codec.h"
+#include "rtc_base/strings/string_builder.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace cricket {
+class Candidate;
+}  // namespace cricket
+
+namespace rtc {
+class StringBuilder;
+}  // namespace rtc
+
+namespace webrtc {
+class IceCandidateInterface;
+class JsepIceCandidate;
+class JsepSessionDescription;
+struct SdpParseError;
+
+// Serializes the passed in JsepSessionDescription.
+// Serialize SessionDescription including candidates if
+// JsepSessionDescription has candidates.
+// jdesc - The JsepSessionDescription object to be serialized.
+// return - SDP string serialized from the arguments.
+std::string SdpSerialize(const JsepSessionDescription& jdesc);
+
+// Serializes the passed in IceCandidateInterface to a SDP string.
+// candidate - The candidate to be serialized.
+std::string SdpSerializeCandidate(const IceCandidateInterface& candidate);
+
+// Serializes a cricket Candidate.
+// candidate - The candidate to be serialized.
+RTC_EXPORT std::string SdpSerializeCandidate(
+    const cricket::Candidate& candidate);
+
+// Deserializes the passed in SDP string to a JsepSessionDescription.
+// message - SDP string to be Deserialized.
+// jdesc - The JsepSessionDescription deserialized from the SDP string.
+// error - The detail error information when parsing fails.
+// return - true on success, false on failure.
+bool SdpDeserialize(absl::string_view message,
+                    JsepSessionDescription* jdesc,
+                    SdpParseError* error);
+
+// Deserializes the passed in SDP string to one JsepIceCandidate.
+// The first line must be a=candidate line and only the first line will be
+// parsed.
+// message - The SDP string to be Deserialized.
+// candidates - The JsepIceCandidate from the SDP string.
+// error - The detail error information when parsing fails.
+// return - true on success, false on failure.
+RTC_EXPORT bool SdpDeserializeCandidate(absl::string_view message,
+                                        JsepIceCandidate* candidate,
+                                        SdpParseError* error);
+
+// Deserializes the passed in SDP string to a cricket Candidate.
+// The first line must be a=candidate line and only the first line will be
+// parsed.
+// transport_name - The transport name (MID) of the candidate.
+// message - The SDP string to be deserialized.
+// candidate - The cricket Candidate from the SDP string.
+// error - The detail error information when parsing fails.
+// return - true on success, false on failure.
+RTC_EXPORT bool SdpDeserializeCandidate(absl::string_view transport_name,
+                                        absl::string_view message,
+                                        cricket::Candidate* candidate,
+                                        SdpParseError* error);
+
+// Parses `message` according to the grammar defined in RFC 5245, Section 15.1
+// and, if successful, stores the result in `candidate` and returns true.
+// If unsuccessful, returns false and stores error information in `error` if
+// `error` is not null.
+// If `is_raw` is false, `message` is expected to be prefixed with "a=".
+// If `is_raw` is true, no prefix is expected in `messaage`.
+RTC_EXPORT bool ParseCandidate(absl::string_view message,
+                               cricket::Candidate* candidate,
+                               SdpParseError* error,
+                               bool is_raw);
+
+// Generates an FMTP line based on `parameters`. Please note that some
+// parameters are not considered to be part of the FMTP line, see the function
+// IsFmtpParam(). Returns true if the set of FMTP parameters is nonempty, false
+// otherwise.
+bool WriteFmtpParameters(const cricket::CodecParameterMap& parameters,
+                         rtc::StringBuilder* os);
+
+}  // namespace webrtc
+
+#endif  // PC_WEBRTC_SDP_H_