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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_session_description.h"
#include "api/rtp_parameters.h"
#include "rtc_base/strings/string_builder.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
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 IceCandidate to a SDP string.
// candidate - The candidate to be serialized.
std::string SdpSerializeCandidate(const IceCandidate& candidate);
// Serializes a cricket Candidate.
// candidate - The candidate to be serialized.
RTC_EXPORT std::string SdpSerializeCandidate(const 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 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,
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,
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 CodecParameterMap& parameters,
StringBuilder* os);
// Parses a string into an FMTP parameter set, in key-value format.
bool ParseFmtpParameterSet(absl::string_view line_params,
CodecParameterMap& codec_params,
SdpParseError* error);
} // namespace webrtc
#endif // PC_WEBRTC_SDP_H_
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