Quelle  webrtc_sdp_unittest.cc   Sprache: C

/*
 *  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.
 */

#include <stdio.h>
#include <string.h>

#include <cstdint>
#include <map>
#include <memory>
#include <optional>
#include <sstream>
#include <string>
#include <utility>
#include <vector>

#include "absl/algorithm/container.h"
#include "absl/memory/memory.h"
#include "absl/strings/str_replace.h"
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "api/candidate.h"
#include "api/jsep.h"
#include "api/jsep_session_description.h"
#include "api/media_types.h"
#include "api/rtp_parameters.h"
#include "api/rtp_transceiver_direction.h"
#include "media/base/codec.h"
#include "media/base/media_constants.h"
#include "media/base/rid_description.h"
#include "media/base/stream_params.h"
#include "p2p/base/p2p_constants.h"
#include "p2p/base/port.h"
#include "p2p/base/transport_description.h"
#include "p2p/base/transport_info.h"
#include "pc/media_protocol_names.h"
#include "pc/media_session.h"
#include "pc/session_description.h"
#include "pc/simulcast_description.h"
#include "rtc_base/checks.h"
#include "rtc_base/message_digest.h"
#include "rtc_base/socket_address.h"
#include "rtc_base/ssl_fingerprint.h"
#include "rtc_base/string_encode.h"
#include "test/gmock.h"
#include "test/gtest.h"

#ifdef WEBRTC_ANDROID
#include "pc/test/android_test_initializer.h"
#endif
#include "pc/webrtc_sdp.h"

using cricket::AudioContentDescription;
using cricket::Candidate;
using cricket::ContentGroup;
using cricket::ContentInfo;
using cricket::ICE_CANDIDATE_COMPONENT_RTCP;
using cricket::ICE_CANDIDATE_COMPONENT_RTP;
using cricket::kFecSsrcGroupSemantics;
using cricket::MediaProtocolType;
using cricket::RidDescription;
using cricket::RidDirection;
using cricket::SctpDataContentDescription;
using cricket::SessionDescription;
using cricket::SimulcastDescription;
using cricket::SimulcastLayer;
using cricket::StreamParams;
using cricket::TransportDescription;
using cricket::TransportInfo;
using cricket::VideoContentDescription;
using ::testing::ElementsAre;
using ::testing::Field;
using webrtc::IceCandidateCollection;
using webrtc::IceCandidateInterface;
using webrtc::IceCandidateType;
using webrtc::JsepIceCandidate;
using webrtc::JsepSessionDescription;
using webrtc::RtpExtension;
using webrtc::RtpTransceiverDirection;
using webrtc::SdpParseError;
using webrtc::SdpType;
using webrtc::SessionDescriptionInterface;

static const uint32_t kDefaultSctpPort = 5000;
static const uint16_t kUnusualSctpPort = 9556;
static const char kSessionTime[] = "t=0 0\r\n";
static const uint32_t kCandidatePriority = 2130706432U;  // pref = 1.0
static const char kAttributeIceUfragVoice[] = "a=ice-ufrag:ufrag_voice\r\n";
static const char kAttributeIcePwdVoice[] = "a=ice-pwd:pwd_voice\r\n";
static const char kAttributeIceUfragVideo[] = "a=ice-ufrag:ufrag_video\r\n";
static const char kAttributeIcePwdVideo[] = "a=ice-pwd:pwd_video\r\n";
static const uint32_t kCandidateGeneration = 2;
static const char kCandidateFoundation1[] = "a0+B/1";
static const char kCandidateFoundation2[] = "a0+B/2";
static const char kCandidateFoundation3[] = "a0+B/3";
static const char kCandidateFoundation4[] = "a0+B/4";
static const char kFingerprint[] =
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n";
static const char kExtmapAllowMixed[] = "a=extmap-allow-mixed\r\n";
static const int kExtmapId = 1;
static const char kExtmapUri[] = "http://example.com/082005/ext.htm#ttime";
static const char kExtmap[] =
    "a=extmap:1 http://example.com/082005/ext.htm#ttime\r\n";
static const char kExtmapWithDirectionAndAttribute[] =
    "a=extmap:1/sendrecv http://example.com/082005/ext.htm#ttime a1 a2\r\n";
static const char kExtmapWithDirectionAndAttributeEncrypted[] =
    "a=extmap:1/sendrecv urn:ietf:params:rtp-hdrext:encrypt "
    "http://example.com/082005/ext.htm#ttime a1 a2\r\n";

static const uint8_t kIdentityDigest[] = {
    0x4A, 0xAD, 0xB9, 0xB1, 0x3F, 0x82, 0x18, 0x3B, 0x54, 0x02,
    0x12, 0xDF, 0x3E, 0x5D, 0x49, 0x6B, 0x19, 0xE5, 0x7C, 0xAB};

static const char kDtlsSctp[] = "DTLS/SCTP";
static const char kUdpDtlsSctp[] = "UDP/DTLS/SCTP";
static const char kTcpDtlsSctp[] = "TCP/DTLS/SCTP";

struct CodecParams {
  int max_ptime;
  int ptime;
  int min_ptime;
  int sprop_stereo;
  int stereo;
  int useinband;
  int maxaveragebitrate;
};

// Reference sdp string
static const char kSdpFullString[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=extmap-allow-mixed\r\n"
    "a=msid-semantic: WMS local_stream_1\r\n"
    "m=audio 2345 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 74.125.127.126\r\n"
    "a=rtcp:2347 IN IP4 74.125.127.126\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1235 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1238 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1239 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/3 1 udp 2130706432 74.125.127.126 2345 typ srflx "
    "raddr 192.168.1.5 rport 2346 "
    "generation 2\r\n"
    "a=candidate:a0+B/3 2 udp 2130706432 74.125.127.126 2347 typ srflx "
    "raddr 192.168.1.5 rport 2348 "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_voice\r\na=ice-pwd:pwd_voice\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"
    "a=mid:audio_content_name\r\n"
    "a=sendrecv\r\n"
    "a=msid:local_stream_1 audio_track_id_1\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:1 cname:stream_1_cname\r\n"
    "m=video 3457 RTP/SAVPF 120\r\n"
    "c=IN IP4 74.125.224.39\r\n"
    "a=rtcp:3456 IN IP4 74.125.224.39\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1236 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1237 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1240 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1241 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/4 2 udp 2130706432 74.125.224.39 3456 typ relay "
    "generation 2\r\n"
    "a=candidate:a0+B/4 1 udp 2130706432 74.125.224.39 3457 typ relay "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_video\r\na=ice-pwd:pwd_video\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"
    "a=mid:video_content_name\r\n"
    "a=sendrecv\r\n"
    "a=msid:local_stream_1 video_track_id_1\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    "a=ssrc-group:FEC 2 3\r\n"
    "a=ssrc:2 cname:stream_1_cname\r\n"
    "a=ssrc:3 cname:stream_1_cname\r\n";

// SDP reference string without the candidates.
static const char kSdpString[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=extmap-allow-mixed\r\n"
    "a=msid-semantic: WMS local_stream_1\r\n"
    "m=audio 9 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_voice\r\na=ice-pwd:pwd_voice\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name\r\n"
    "a=sendrecv\r\n"
    "a=msid:local_stream_1 audio_track_id_1\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:1 cname:stream_1_cname\r\n"
    "m=video 9 RTP/SAVPF 120\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_video\r\na=ice-pwd:pwd_video\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:video_content_name\r\n"
    "a=sendrecv\r\n"
    "a=msid:local_stream_1 video_track_id_1\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    "a=ssrc-group:FEC 2 3\r\n"
    "a=ssrc:2 cname:stream_1_cname\r\n"
    "a=ssrc:3 cname:stream_1_cname\r\n";

// draft-ietf-mmusic-sctp-sdp-03
static const char kSdpSctpDataChannelString[] =
    "m=application 9 UDP/DTLS/SCTP 5000\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_data\r\n"
    "a=ice-pwd:pwd_data\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:data_content_name\r\n"
    "a=sctpmap:5000 webrtc-datachannel 1024\r\n";

// draft-ietf-mmusic-sctp-sdp-12
// Note - this is invalid per draft-ietf-mmusic-sctp-sdp-26,
// since the separator after "sctp-port" needs to be a colon.
static const char kSdpSctpDataChannelStringWithSctpPort[] =
    "m=application 9 UDP/DTLS/SCTP webrtc-datachannel\r\n"
    "a=sctp-port 5000\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_data\r\n"
    "a=ice-pwd:pwd_data\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:data_content_name\r\n";

// draft-ietf-mmusic-sctp-sdp-26
static const char kSdpSctpDataChannelStringWithSctpColonPort[] =
    "m=application 9 UDP/DTLS/SCTP webrtc-datachannel\r\n"
    "a=sctp-port:5000\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_data\r\n"
    "a=ice-pwd:pwd_data\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:data_content_name\r\n";

static const char kSdpSctpDataChannelWithCandidatesString[] =
    "m=application 2345 UDP/DTLS/SCTP 5000\r\n"
    "c=IN IP4 74.125.127.126\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1238 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/3 1 udp 2130706432 74.125.127.126 2345 typ srflx "
    "raddr 192.168.1.5 rport 2346 "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_data\r\n"
    "a=ice-pwd:pwd_data\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:data_content_name\r\n"
    "a=sctpmap:5000 webrtc-datachannel 1024\r\n";

static const char kSdpConferenceString[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=msid-semantic: WMS\r\n"
    "m=audio 9 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=x-google-flag:conference\r\n"
    "m=video 9 RTP/SAVPF 120\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=x-google-flag:conference\r\n";

static const char kSdpSessionString[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=msid-semantic: WMS local_stream\r\n";

static const char kSdpAudioString[] =
    "m=audio 9 RTP/SAVPF 111\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_voice\r\na=ice-pwd:pwd_voice\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=ssrc:1 cname:stream_1_cname\r\n"
    "a=ssrc:1 msid:local_stream audio_track_id_1\r\n";

static const char kSdpVideoString[] =
    "m=video 9 RTP/SAVPF 120\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_video\r\na=ice-pwd:pwd_video\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:video_content_name\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    "a=ssrc:2 cname:stream_1_cname\r\n"
    "a=ssrc:2 msid:local_stream video_track_id_1\r\n";

// Reference sdp string using bundle-only.
static const char kBundleOnlySdpFullString[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=extmap-allow-mixed\r\n"
    "a=group:BUNDLE audio_content_name video_content_name\r\n"
    "a=msid-semantic: WMS local_stream_1\r\n"
    "m=audio 2345 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 74.125.127.126\r\n"
    "a=rtcp:2347 IN IP4 74.125.127.126\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1235 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1238 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1239 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/3 1 udp 2130706432 74.125.127.126 2345 typ srflx "
    "raddr 192.168.1.5 rport 2346 "
    "generation 2\r\n"
    "a=candidate:a0+B/3 2 udp 2130706432 74.125.127.126 2347 typ srflx "
    "raddr 192.168.1.5 rport 2348 "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_voice\r\na=ice-pwd:pwd_voice\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name\r\n"
    "a=msid:local_stream_1 audio_track_id_1\r\n"
    "a=sendrecv\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:1 cname:stream_1_cname\r\n"
    "m=video 0 RTP/SAVPF 120\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=bundle-only\r\n"
    "a=mid:video_content_name\r\n"
    "a=msid:local_stream_1 video_track_id_1\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"
    "a=ssrc-group:FEC 2 3\r\n"
    "a=ssrc:2 cname:stream_1_cname\r\n"
    "a=ssrc:3 cname:stream_1_cname\r\n";

// Plan B SDP reference string, with 2 streams, 2 audio tracks and 3 video
// tracks.
static const char kPlanBSdpFullString[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=extmap-allow-mixed\r\n"
    "a=msid-semantic: WMS local_stream_1 local_stream_2\r\n"
    "m=audio 2345 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 74.125.127.126\r\n"
    "a=rtcp:2347 IN IP4 74.125.127.126\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1235 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1238 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1239 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/3 1 udp 2130706432 74.125.127.126 2345 typ srflx "
    "raddr 192.168.1.5 rport 2346 "
    "generation 2\r\n"
    "a=candidate:a0+B/3 2 udp 2130706432 74.125.127.126 2347 typ srflx "
    "raddr 192.168.1.5 rport 2348 "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_voice\r\na=ice-pwd:pwd_voice\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name\r\n"
    "a=sendrecv\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:1 cname:stream_1_cname\r\n"
    "a=ssrc:1 msid:local_stream_1 audio_track_id_1\r\n"
    "a=ssrc:4 cname:stream_2_cname\r\n"
    "a=ssrc:4 msid:local_stream_2 audio_track_id_2\r\n"
    "m=video 3457 RTP/SAVPF 120\r\n"
    "c=IN IP4 74.125.224.39\r\n"
    "a=rtcp:3456 IN IP4 74.125.224.39\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1236 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1237 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1240 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1241 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/4 2 udp 2130706432 74.125.224.39 3456 typ relay "
    "generation 2\r\n"
    "a=candidate:a0+B/4 1 udp 2130706432 74.125.224.39 3457 typ relay "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_video\r\na=ice-pwd:pwd_video\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:video_content_name\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    "a=ssrc-group:FEC 2 3\r\n"
    "a=ssrc:2 cname:stream_1_cname\r\n"
    "a=ssrc:2 msid:local_stream_1 video_track_id_1\r\n"
    "a=ssrc:3 cname:stream_1_cname\r\n"
    "a=ssrc:3 msid:local_stream_1 video_track_id_1\r\n"
    "a=ssrc:5 cname:stream_2_cname\r\n"
    "a=ssrc:5 msid:local_stream_2 video_track_id_2\r\n"
    "a=ssrc:6 cname:stream_2_cname\r\n"
    "a=ssrc:6 msid:local_stream_2 video_track_id_3\r\n";

// Unified Plan SDP reference string, with 2 streams, 2 audio tracks and 3 video
// tracks.
static const char kUnifiedPlanSdpFullString[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=extmap-allow-mixed\r\n"
    "a=msid-semantic: WMS local_stream_1\r\n"
    // Audio track 1, stream 1 (with candidates).
    "m=audio 2345 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 74.125.127.126\r\n"
    "a=rtcp:2347 IN IP4 74.125.127.126\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1235 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1238 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1239 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/3 1 udp 2130706432 74.125.127.126 2345 typ srflx "
    "raddr 192.168.1.5 rport 2346 "
    "generation 2\r\n"
    "a=candidate:a0+B/3 2 udp 2130706432 74.125.127.126 2347 typ srflx "
    "raddr 192.168.1.5 rport 2348 "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_voice\r\na=ice-pwd:pwd_voice\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name\r\n"
    "a=msid:local_stream_1 audio_track_id_1\r\n"
    "a=sendrecv\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:1 cname:stream_1_cname\r\n"
    // Video track 1, stream 1 (with candidates).
    "m=video 3457 RTP/SAVPF 120\r\n"
    "c=IN IP4 74.125.224.39\r\n"
    "a=rtcp:3456 IN IP4 74.125.224.39\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1236 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1237 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1240 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1241 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/4 2 udp 2130706432 74.125.224.39 3456 typ relay "
    "generation 2\r\n"
    "a=candidate:a0+B/4 1 udp 2130706432 74.125.224.39 3457 typ relay "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_video\r\na=ice-pwd:pwd_video\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:video_content_name\r\n"
    "a=msid:local_stream_1 video_track_id_1\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    "a=ssrc-group:FEC 2 3\r\n"
    "a=ssrc:2 cname:stream_1_cname\r\n"
    "a=ssrc:3 cname:stream_1_cname\r\n"
    // Audio track 2, stream 2.
    "m=audio 9 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_voice_2\r\na=ice-pwd:pwd_voice_2\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name_2\r\n"
    "a=msid:local_stream_2 audio_track_id_2\r\n"
    "a=sendrecv\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:4 cname:stream_2_cname\r\n"
    // Video track 2, stream 2.
    "m=video 9 RTP/SAVPF 120\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_video_2\r\na=ice-pwd:pwd_video_2\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:video_content_name_2\r\n"
    "a=msid:local_stream_2 video_track_id_2\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    "a=ssrc:5 cname:stream_2_cname\r\n"
    // Video track 3, stream 2.
    "m=video 9 RTP/SAVPF 120\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_video_3\r\na=ice-pwd:pwd_video_3\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:video_content_name_3\r\n"
    "a=msid:local_stream_2 video_track_id_3\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    "a=ssrc:6 cname:stream_2_cname\r\n";

// Unified Plan SDP reference string:
// - audio track 1 has 1 a=msid lines
// - audio track 2 has 2 a=msid lines
// - audio track 3 has 1 a=msid line with the special "-" marker signifying that
//   there are 0 media stream ids.
// This Unified Plan SDP represents a SDP that signals the msid using both
// a=msid and a=ssrc msid semantics.
static const char kUnifiedPlanSdpFullStringWithSpecialMsid[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=extmap-allow-mixed\r\n"
    "a=msid-semantic: WMS local_stream_1\r\n"
    // Audio track 1, with 1 stream id.
    "m=audio 2345 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 74.125.127.126\r\n"
    "a=rtcp:2347 IN IP4 74.125.127.126\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1235 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1238 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1239 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/3 1 udp 2130706432 74.125.127.126 2345 typ srflx "
    "raddr 192.168.1.5 rport 2346 "
    "generation 2\r\n"
    "a=candidate:a0+B/3 2 udp 2130706432 74.125.127.126 2347 typ srflx "
    "raddr 192.168.1.5 rport 2348 "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_voice\r\na=ice-pwd:pwd_voice\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name\r\n"
    "a=sendrecv\r\n"
    "a=msid:local_stream_1 audio_track_id_1\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:1 cname:stream_1_cname\r\n"
    "a=ssrc:1 msid:local_stream_1 audio_track_id_1\r\n"
    // Audio track 2, with two stream ids.
    "m=audio 9 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_voice_2\r\na=ice-pwd:pwd_voice_2\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name_2\r\n"
    "a=sendrecv\r\n"
    "a=msid:local_stream_1 audio_track_id_2\r\n"
    "a=msid:local_stream_2 audio_track_id_2\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:4 cname:stream_1_cname\r\n"
    // The support for Plan B msid signaling only includes the
    // first media stream id "local_stream_1."
    "a=ssrc:4 msid:local_stream_1 audio_track_id_2\r\n"
    // Audio track 3, with no stream ids.
    "m=audio 9 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_voice_3\r\na=ice-pwd:pwd_voice_3\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name_3\r\n"
    "a=sendrecv\r\n"
    "a=msid:- audio_track_id_3\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    "a=ssrc:7 cname:stream_2_cname\r\n"
    "a=ssrc:7 msid:- audio_track_id_3\r\n";

// SDP string for unified plan without SSRCs
static const char kUnifiedPlanSdpFullStringNoSsrc[] =
    "v=0\r\n"
    "o=- 18446744069414584320 18446462598732840960 IN IP4 127.0.0.1\r\n"
    "s=-\r\n"
    "t=0 0\r\n"
    "a=msid-semantic: WMS local_stream_1\r\n"
    // Audio track 1, stream 1 (with candidates).
    "m=audio 2345 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 74.125.127.126\r\n"
    "a=rtcp:2347 IN IP4 74.125.127.126\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1235 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1238 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1239 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/3 1 udp 2130706432 74.125.127.126 2345 typ srflx "
    "raddr 192.168.1.5 rport 2346 "
    "generation 2\r\n"
    "a=candidate:a0+B/3 2 udp 2130706432 74.125.127.126 2347 typ srflx "
    "raddr 192.168.1.5 rport 2348 "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_voice\r\na=ice-pwd:pwd_voice\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:audio_content_name\r\n"
    "a=msid:local_stream_1 audio_track_id_1\r\n"
    "a=sendrecv\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    // Video track 1, stream 1 (with candidates).
    "m=video 3457 RTP/SAVPF 120\r\n"
    "c=IN IP4 74.125.224.39\r\n"
    "a=rtcp:3456 IN IP4 74.125.224.39\r\n"
    "a=candidate:a0+B/1 2 udp 2130706432 192.168.1.5 1236 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1237 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 2 udp 2130706432 ::1 1240 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/2 1 udp 2130706432 ::1 1241 typ host "
    "generation 2\r\n"
    "a=candidate:a0+B/4 2 udp 2130706432 74.125.224.39 3456 typ relay "
    "generation 2\r\n"
    "a=candidate:a0+B/4 1 udp 2130706432 74.125.224.39 3457 typ relay "
    "generation 2\r\n"
    "a=ice-ufrag:ufrag_video\r\na=ice-pwd:pwd_video\r\n"
    "a=fingerprint:sha-1 "
    "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n"

    "a=mid:video_content_name\r\n"
    "a=msid:local_stream_1 video_track_id_1\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    // Audio track 2, stream 2.
    "m=audio 9 RTP/SAVPF 111 103 104\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_voice_2\r\na=ice-pwd:pwd_voice_2\r\n"
    "a=mid:audio_content_name_2\r\n"
    "a=msid:local_stream_2 audio_track_id_2\r\n"
    "a=sendrecv\r\n"
    "a=rtcp-mux\r\n"
    "a=rtcp-rsize\r\n"
    "a=rtpmap:111 opus/48000/2\r\n"
    "a=rtpmap:103 ISAC/16000\r\n"
    "a=rtpmap:104 ISAC/32000\r\n"
    // Video track 2, stream 2.
    "m=video 9 RTP/SAVPF 120\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_video_2\r\na=ice-pwd:pwd_video_2\r\n"
    "a=mid:video_content_name_2\r\n"
    "a=msid:local_stream_2 video_track_id_2\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n"
    // Video track 3, stream 2.
    "m=video 9 RTP/SAVPF 120\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "a=rtcp:9 IN IP4 0.0.0.0\r\n"
    "a=ice-ufrag:ufrag_video_3\r\na=ice-pwd:pwd_video_3\r\n"
    "a=mid:video_content_name_3\r\n"
    "a=msid:local_stream_2 video_track_id_3\r\n"
    "a=sendrecv\r\n"
    "a=rtpmap:120 VP8/90000\r\n";

// One candidate reference string as per W3c spec.
// candidate:<blah> not a=candidate:<blah>CRLF
static const char kRawCandidate[] =
    "candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host generation 2";
// One candidate reference string.
static const char kSdpOneCandidate[] =
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host "
    "generation 2\r\n";

static const char kSdpTcpActiveCandidate[] =
    "candidate:a0+B/1 1 tcp 2130706432 192.168.1.5 9 typ host "
    "tcptype active generation 2";
static const char kSdpTcpPassiveCandidate[] =
    "candidate:a0+B/1 1 tcp 2130706432 192.168.1.5 9 typ host "
    "tcptype passive generation 2";
static const char kSdpTcpSOCandidate[] =
    "candidate:a0+B/1 1 tcp 2130706432 192.168.1.5 9 typ host "
    "tcptype so generation 2";
static const char kSdpTcpInvalidCandidate[] =
    "candidate:a0+B/1 1 tcp 2130706432 192.168.1.5 9 typ host "
    "tcptype invalid generation 2";

// One candidate reference string with IPV6 address.
static const char kRawIPV6Candidate[] =
    "candidate:a0+B/1 1 udp 2130706432 "
    "abcd:abcd:abcd:abcd:abcd:abcd:abcd:abcd 1234 typ host generation 2";

// One candidate reference string.
static const char kSdpOneCandidateWithUfragPwd[] =
    "a=candidate:a0+B/1 1 udp 2130706432 192.168.1.5 1234 typ host network_name"
    " eth0 ufrag user_rtp pwd password_rtp generation 2\r\n";

static const char kRawHostnameCandidate[] =
    "candidate:a0+B/1 1 udp 2130706432 a.test 1234 typ host generation 2";

// Session id and version
static const char kSessionId[] = "18446744069414584320";
static const char kSessionVersion[] = "18446462598732840960";

// ICE options.
static const char kIceOption1[] = "iceoption1";
static const char kIceOption2[] = "iceoption2";
static const char kIceOption3[] = "iceoption3";

// ICE ufrags/passwords.
static const char kUfragVoice[] = "ufrag_voice";
static const char kPwdVoice[] = "pwd_voice";
static const char kUfragVideo[] = "ufrag_video";
static const char kPwdVideo[] = "pwd_video";
static const char kUfragData[] = "ufrag_data";
static const char kPwdData[] = "pwd_data";

// Extra ufrags/passwords for extra unified plan m= sections.
static const char kUfragVoice2[] = "ufrag_voice_2";
static const char kPwdVoice2[] = "pwd_voice_2";
static const char kUfragVoice3[] = "ufrag_voice_3";
static const char kPwdVoice3[] = "pwd_voice_3";
static const char kUfragVideo2[] = "ufrag_video_2";
static const char kPwdVideo2[] = "pwd_video_2";
static const char kUfragVideo3[] = "ufrag_video_3";
static const char kPwdVideo3[] = "pwd_video_3";

// Content name
static const char kAudioContentName[] = "audio_content_name";
static const char kVideoContentName[] = "video_content_name";
static const char kDataContentName[] = "data_content_name";

// Extra content names for extra unified plan m= sections.
static const char kAudioContentName2[] = "audio_content_name_2";
static const char kAudioContentName3[] = "audio_content_name_3";
static const char kVideoContentName2[] = "video_content_name_2";
static const char kVideoContentName3[] = "video_content_name_3";

// MediaStream 1
static const char kStreamId1[] = "local_stream_1";
static const char kStream1Cname[] = "stream_1_cname";
static const char kAudioTrackId1[] = "audio_track_id_1";
static const uint32_t kAudioTrack1Ssrc = 1;
static const char kVideoTrackId1[] = "video_track_id_1";
static const uint32_t kVideoTrack1Ssrc1 = 2;
static const uint32_t kVideoTrack1Ssrc2 = 3;

// MediaStream 2
static const char kStreamId2[] = "local_stream_2";
static const char kStream2Cname[] = "stream_2_cname";
static const char kAudioTrackId2[] = "audio_track_id_2";
static const uint32_t kAudioTrack2Ssrc = 4;
static const char kVideoTrackId2[] = "video_track_id_2";
static const uint32_t kVideoTrack2Ssrc = 5;
static const char kVideoTrackId3[] = "video_track_id_3";
static const uint32_t kVideoTrack3Ssrc = 6;
static const char kAudioTrackId3[] = "audio_track_id_3";
static const uint32_t kAudioTrack3Ssrc = 7;

// Candidate
static const char kDummyMid[] = "dummy_mid";
static const int kDummyIndex = 123;

// Misc
static SdpType kDummyType = SdpType::kOffer;

// Helper functions

static bool SdpDeserialize(const std::string& message,
                           JsepSessionDescription* jdesc) {
  return webrtc::SdpDeserialize(message, jdesc, NULL);
}

static bool SdpDeserializeCandidate(const std::string& message,
                                    JsepIceCandidate* candidate) {
  return webrtc::SdpDeserializeCandidate(message, candidate, NULL);
}

// Add some extra `newlines` to the `message` after `line`.
static void InjectAfter(const std::string& line,
                        const std::string& newlines,
                        std::string* message) {
  absl::StrReplaceAll({{line, line + newlines}}, message);
}

static void Replace(const std::string& line,
                    const std::string& newlines,
                    std::string* message) {
  absl::StrReplaceAll({{line, newlines}}, message);
}

// Expect a parse failure on the line containing `bad_part` when attempting to
// parse `bad_sdp`.
static void ExpectParseFailure(const std::string& bad_sdp,
                               const std::string& bad_part) {
  JsepSessionDescription desc(kDummyType);
  SdpParseError error;
  bool ret = webrtc::SdpDeserialize(bad_sdp, &desc, &error);
  ASSERT_FALSE(ret);
  EXPECT_NE(std::string::npos, error.line.find(bad_part.c_str()))
      << "Did not find " << bad_part << " in " << error.line;
}

// Expect fail to parse kSdpFullString if replace `good_part` with `bad_part`.
static void ExpectParseFailure(const char* good_part, const char* bad_part) {
  std::string bad_sdp = kSdpFullString;
  Replace(good_part, bad_part, &bad_sdp);
  ExpectParseFailure(bad_sdp, bad_part);
}

// Expect fail to parse kSdpFullString if add `newlines` after `injectpoint`.
static void ExpectParseFailureWithNewLines(const std::string& injectpoint,
                                           const std::string& newlines,
                                           const std::string& bad_part) {
  std::string bad_sdp = kSdpFullString;
  InjectAfter(injectpoint, newlines, &bad_sdp);
  ExpectParseFailure(bad_sdp, bad_part);
}

static void ReplaceDirection(RtpTransceiverDirection direction,
                             std::string* message) {
  std::string new_direction;
  switch (direction) {
    case RtpTransceiverDirection::kInactive:
      new_direction = "a=inactive";
      break;
    case RtpTransceiverDirection::kSendOnly:
      new_direction = "a=sendonly";
      break;
    case RtpTransceiverDirection::kRecvOnly:
      new_direction = "a=recvonly";
      break;
    case RtpTransceiverDirection::kSendRecv:
      new_direction = "a=sendrecv";
      break;
    case RtpTransceiverDirection::kStopped:
    default:
      RTC_DCHECK_NOTREACHED();
      new_direction = "a=sendrecv";
      break;
  }
  Replace("a=sendrecv", new_direction, message);
}

static void ReplaceRejected(bool audio_rejected,
                            bool video_rejected,
                            std::string* message) {
  if (audio_rejected) {
    Replace("m=audio 9", "m=audio 0", message);
    Replace(kAttributeIceUfragVoice, "", message);
    Replace(kAttributeIcePwdVoice, "", message);
  }
  if (video_rejected) {
    Replace("m=video 9", "m=video 0", message);
    Replace(kAttributeIceUfragVideo, "", message);
    Replace(kAttributeIcePwdVideo, "", message);
  }
}

static TransportDescription MakeTransportDescription(std::string ufrag,
                                                     std::string pwd) {
  rtc::SSLFingerprint fingerprint(rtc::DIGEST_SHA_1, kIdentityDigest);
  return TransportDescription(std::vector<std::string>(), ufrag, pwd,
                              cricket::ICEMODE_FULL,
                              cricket::CONNECTIONROLE_NONE, &fingerprint);
}

// WebRtcSdpTest

class WebRtcSdpTest : public ::testing::Test {
 public:
  WebRtcSdpTest() : jdesc_(kDummyType) {
#ifdef WEBRTC_ANDROID
    webrtc::InitializeAndroidObjects();
#endif
    // AudioContentDescription
    audio_desc_ = CreateAudioContentDescription();
    StreamParams audio_stream;
    audio_stream.id = kAudioTrackId1;
    audio_stream.cname = kStream1Cname;
    audio_stream.set_stream_ids({kStreamId1});
    audio_stream.ssrcs.push_back(kAudioTrack1Ssrc);
    audio_desc_->AddStream(audio_stream);
    rtc::SocketAddress audio_addr("74.125.127.126", 2345);
    audio_desc_->set_connection_address(audio_addr);
    desc_.AddContent(kAudioContentName, MediaProtocolType::kRtp,
                     absl::WrapUnique(audio_desc_));

    // VideoContentDescription
    video_desc_ = CreateVideoContentDescription();
    StreamParams video_stream;
    video_stream.id = kVideoTrackId1;
    video_stream.cname = kStream1Cname;
    video_stream.set_stream_ids({kStreamId1});
    video_stream.ssrcs.push_back(kVideoTrack1Ssrc1);
    video_stream.ssrcs.push_back(kVideoTrack1Ssrc2);
    cricket::SsrcGroup ssrc_group(kFecSsrcGroupSemantics, video_stream.ssrcs);
    video_stream.ssrc_groups.push_back(ssrc_group);
    video_desc_->AddStream(video_stream);
    rtc::SocketAddress video_addr("74.125.224.39", 3457);
    video_desc_->set_connection_address(video_addr);
    desc_.AddContent(kVideoContentName, MediaProtocolType::kRtp,
                     absl::WrapUnique(video_desc_));

    // TransportInfo, with fingerprint
    rtc::SSLFingerprint fingerprint(rtc::DIGEST_SHA_1, kIdentityDigest);
    desc_.AddTransportInfo(TransportInfo(
        kAudioContentName, MakeTransportDescription(kUfragVoice, kPwdVoice)));
    desc_.AddTransportInfo(TransportInfo(
        kVideoContentName, MakeTransportDescription(kUfragVideo, kPwdVideo)));

    // v4 host
    int port = 1234;
    rtc::SocketAddress address("192.168.1.5", port++);
    Candidate candidate1(ICE_CANDIDATE_COMPONENT_RTP, "udp", address,
                         kCandidatePriority, "", "", IceCandidateType::kHost,
                         kCandidateGeneration, kCandidateFoundation1);
    address.SetPort(port++);
    Candidate candidate2(ICE_CANDIDATE_COMPONENT_RTCP, "udp", address,
                         kCandidatePriority, "", "", IceCandidateType::kHost,
                         kCandidateGeneration, kCandidateFoundation1);
    address.SetPort(port++);
    Candidate candidate3(ICE_CANDIDATE_COMPONENT_RTCP, "udp", address,
                         kCandidatePriority, "", "", IceCandidateType::kHost,
                         kCandidateGeneration, kCandidateFoundation1);
    address.SetPort(port++);
    Candidate candidate4(ICE_CANDIDATE_COMPONENT_RTP, "udp", address,
                         kCandidatePriority, "", "", IceCandidateType::kHost,
                         kCandidateGeneration, kCandidateFoundation1);

    // v6 host
    rtc::SocketAddress v6_address("::1", port++);
    cricket::Candidate candidate5(cricket::ICE_CANDIDATE_COMPONENT_RTP, "udp",
                                  v6_address, kCandidatePriority, "", "",
                                  IceCandidateType::kHost, kCandidateGeneration,
                                  kCandidateFoundation2);
    v6_address.SetPort(port++);
    cricket::Candidate candidate6(cricket::ICE_CANDIDATE_COMPONENT_RTCP, "udp",
                                  v6_address, kCandidatePriority, "", "",
                                  IceCandidateType::kHost, kCandidateGeneration,
                                  kCandidateFoundation2);
    v6_address.SetPort(port++);
    cricket::Candidate candidate7(cricket::ICE_CANDIDATE_COMPONENT_RTCP, "udp",
                                  v6_address, kCandidatePriority, "", "",
                                  IceCandidateType::kHost, kCandidateGeneration,
                                  kCandidateFoundation2);
    v6_address.SetPort(port++);
    cricket::Candidate candidate8(cricket::ICE_CANDIDATE_COMPONENT_RTP, "udp",
                                  v6_address, kCandidatePriority, "", "",
                                  IceCandidateType::kHost, kCandidateGeneration,
                                  kCandidateFoundation2);

    // stun
    int port_stun = 2345;
    rtc::SocketAddress address_stun("74.125.127.126", port_stun++);
    rtc::SocketAddress rel_address_stun("192.168.1.5", port_stun++);
    cricket::Candidate candidate9(cricket::ICE_CANDIDATE_COMPONENT_RTP, "udp",
                                  address_stun, kCandidatePriority, "", "",
                                  IceCandidateType::kSrflx,
                                  kCandidateGeneration, kCandidateFoundation3);
    candidate9.set_related_address(rel_address_stun);

    address_stun.SetPort(port_stun++);
    rel_address_stun.SetPort(port_stun++);
    cricket::Candidate candidate10(cricket::ICE_CANDIDATE_COMPONENT_RTCP, "udp",
                                   address_stun, kCandidatePriority, "", "",
                                   IceCandidateType::kSrflx,
                                   kCandidateGeneration, kCandidateFoundation3);
    candidate10.set_related_address(rel_address_stun);

    // relay
    int port_relay = 3456;
    rtc::SocketAddress address_relay("74.125.224.39", port_relay++);
    cricket::Candidate candidate11(cricket::ICE_CANDIDATE_COMPONENT_RTCP, "udp",
                                   address_relay, kCandidatePriority, "", "",
                                   IceCandidateType::kRelay,
                                   kCandidateGeneration, kCandidateFoundation4);
    address_relay.SetPort(port_relay++);
    cricket::Candidate candidate12(cricket::ICE_CANDIDATE_COMPONENT_RTP, "udp",
                                   address_relay, kCandidatePriority, "", "",
                                   IceCandidateType::kRelay,
                                   kCandidateGeneration, kCandidateFoundation4);

    // voice
    candidates_.push_back(candidate1);
    candidates_.push_back(candidate2);
    candidates_.push_back(candidate5);
    candidates_.push_back(candidate6);
    candidates_.push_back(candidate9);
    candidates_.push_back(candidate10);

    // video
    candidates_.push_back(candidate3);
    candidates_.push_back(candidate4);
    candidates_.push_back(candidate7);
    candidates_.push_back(candidate8);
    candidates_.push_back(candidate11);
    candidates_.push_back(candidate12);

    jcandidate_.reset(
        new JsepIceCandidate(std::string("audio_content_name"), 0, candidate1));

    // Set up JsepSessionDescription.
    jdesc_.Initialize(desc_.Clone(), kSessionId, kSessionVersion);
    std::string mline_id;
    int mline_index = 0;
    for (size_t i = 0; i < candidates_.size(); ++i) {
      // In this test, the audio m line index will be 0, and the video m line
      // will be 1.
      bool is_video = (i > 5);
      mline_id = is_video ? "video_content_name" : "audio_content_name";
      mline_index = is_video ? 1 : 0;
      JsepIceCandidate jice(mline_id, mline_index, candidates_.at(i));
      jdesc_.AddCandidate(&jice);
    }
  }

  void RemoveVideoCandidates() {
    const IceCandidateCollection* video_candidates_collection =
        jdesc_.candidates(1);
    ASSERT_NE(nullptr, video_candidates_collection);
    std::vector<cricket::Candidate> video_candidates;
    for (size_t i = 0; i < video_candidates_collection->count(); ++i) {
      cricket::Candidate c = video_candidates_collection->at(i)->candidate();
      c.set_transport_name("video_content_name");
      video_candidates.push_back(c);
    }
    jdesc_.RemoveCandidates(video_candidates);
  }

  // Turns the existing reference description into a description using
  // a=bundle-only. This means no transport attributes and a 0 port value on
  // the m= sections not associated with the BUNDLE-tag.
  void MakeBundleOnlyDescription() {
    RemoveVideoCandidates();

    // And the rest of the transport attributes.
    desc_.transport_infos()[1].description.ice_ufrag.clear();
    desc_.transport_infos()[1].description.ice_pwd.clear();
    desc_.transport_infos()[1].description.connection_role =
        cricket::CONNECTIONROLE_NONE;

    // Set bundle-only flag.
    desc_.contents()[1].bundle_only = true;

    // Add BUNDLE group.
    ContentGroup group(cricket::GROUP_TYPE_BUNDLE);
    group.AddContentName(kAudioContentName);
    group.AddContentName(kVideoContentName);
    desc_.AddGroup(group);

    ASSERT_TRUE(jdesc_.Initialize(desc_.Clone(), jdesc_.session_id(),
                                  jdesc_.session_version()));
  }

  // Turns the existing reference description into a plan B description,
  // with 2 audio tracks and 3 video tracks.
  void MakePlanBDescription() {
    audio_desc_ = new AudioContentDescription(*audio_desc_);
    video_desc_ = new VideoContentDescription(*video_desc_);

    StreamParams audio_track_2;
    audio_track_2.id = kAudioTrackId2;
    audio_track_2.cname = kStream2Cname;
    audio_track_2.set_stream_ids({kStreamId2});
    audio_track_2.ssrcs.push_back(kAudioTrack2Ssrc);
    audio_desc_->AddStream(audio_track_2);

    StreamParams video_track_2;
    video_track_2.id = kVideoTrackId2;
    video_track_2.cname = kStream2Cname;
    video_track_2.set_stream_ids({kStreamId2});
    video_track_2.ssrcs.push_back(kVideoTrack2Ssrc);
    video_desc_->AddStream(video_track_2);

    StreamParams video_track_3;
    video_track_3.id = kVideoTrackId3;
    video_track_3.cname = kStream2Cname;
    video_track_3.set_stream_ids({kStreamId2});
    video_track_3.ssrcs.push_back(kVideoTrack3Ssrc);
    video_desc_->AddStream(video_track_3);

    desc_.RemoveContentByName(kAudioContentName);
    desc_.RemoveContentByName(kVideoContentName);
    desc_.AddContent(kAudioContentName, MediaProtocolType::kRtp,
                     absl::WrapUnique(audio_desc_));
    desc_.AddContent(kVideoContentName, MediaProtocolType::kRtp,
                     absl::WrapUnique(video_desc_));
    desc_.set_msid_signaling(cricket::kMsidSignalingSsrcAttribute |
                             cricket::kMsidSignalingSemantic);
    ASSERT_TRUE(jdesc_.Initialize(desc_.Clone(), jdesc_.session_id(),
                                  jdesc_.session_version()));
  }

  // Turns the existing reference description into a unified plan description,
  // with 2 audio tracks and 3 video tracks.
  void MakeUnifiedPlanDescription(bool use_ssrcs = true) {
    // Audio track 2.
    AudioContentDescription* audio_desc_2 = CreateAudioContentDescription();
    StreamParams audio_track_2;
    audio_track_2.id = kAudioTrackId2;
    audio_track_2.set_stream_ids({kStreamId2});
    if (use_ssrcs) {
      audio_track_2.cname = kStream2Cname;
      audio_track_2.ssrcs.push_back(kAudioTrack2Ssrc);
    }
    audio_desc_2->AddStream(audio_track_2);
    desc_.AddContent(kAudioContentName2, MediaProtocolType::kRtp,
                     absl::WrapUnique(audio_desc_2));
    desc_.AddTransportInfo(
        TransportInfo(kAudioContentName2,
                      MakeTransportDescription(kUfragVoice2, kPwdVoice2)));
    // Video track 2, in stream 2.
    VideoContentDescription* video_desc_2 = CreateVideoContentDescription();
    StreamParams video_track_2;
    video_track_2.id = kVideoTrackId2;
    video_track_2.set_stream_ids({kStreamId2});
    if (use_ssrcs) {
      video_track_2.cname = kStream2Cname;
      video_track_2.ssrcs.push_back(kVideoTrack2Ssrc);
    }
    video_desc_2->AddStream(video_track_2);
    desc_.AddContent(kVideoContentName2, MediaProtocolType::kRtp,
                     absl::WrapUnique(video_desc_2));
    desc_.AddTransportInfo(
        TransportInfo(kVideoContentName2,
                      MakeTransportDescription(kUfragVideo2, kPwdVideo2)));

    // Video track 3, in stream 2.
    VideoContentDescription* video_desc_3 = CreateVideoContentDescription();
    StreamParams video_track_3;
    video_track_3.id = kVideoTrackId3;
    video_track_3.set_stream_ids({kStreamId2});
    if (use_ssrcs) {
      video_track_3.cname = kStream2Cname;
      video_track_3.ssrcs.push_back(kVideoTrack3Ssrc);
    }
    video_desc_3->AddStream(video_track_3);
    desc_.AddContent(kVideoContentName3, MediaProtocolType::kRtp,
                     absl::WrapUnique(video_desc_3));
    desc_.AddTransportInfo(
        TransportInfo(kVideoContentName3,
                      MakeTransportDescription(kUfragVideo3, kPwdVideo3)));
    desc_.set_msid_signaling(cricket::kMsidSignalingMediaSection |
                             cricket::kMsidSignalingSemantic);

    ASSERT_TRUE(jdesc_.Initialize(desc_.Clone(), jdesc_.session_id(),
                                  jdesc_.session_version()));
  }

  // Creates an audio content description with no streams, and some default
  // configuration.
  AudioContentDescription* CreateAudioContentDescription() {
    AudioContentDescription* audio = new AudioContentDescription();
    audio->set_rtcp_mux(true);
    audio->set_rtcp_reduced_size(true);
    audio->set_protocol(cricket::kMediaProtocolSavpf);
    audio->AddCodec(cricket::CreateAudioCodec(111, "opus", 48000, 2));
    audio->AddCodec(cricket::CreateAudioCodec(103, "ISAC", 16000, 1));
    audio->AddCodec(cricket::CreateAudioCodec(104, "ISAC", 32000, 1));
    return audio;
  }

  // Turns the existing reference description into a unified plan description,
  // with 3 audio MediaContentDescriptions with special StreamParams that
  // contain 0 or multiple stream ids: - audio track 1 has 1 media stream id -
  // audio track 2 has 2 media stream ids - audio track 3 has 0 media stream ids
  void MakeUnifiedPlanDescriptionMultipleStreamIds(const int msid_signaling) {
    desc_.RemoveContentByName(kVideoContentName);
    desc_.RemoveTransportInfoByName(kVideoContentName);
    RemoveVideoCandidates();

    // Audio track 2 has 2 media stream ids.
    AudioContentDescription* audio_desc_2 = CreateAudioContentDescription();
    StreamParams audio_track_2;
    audio_track_2.id = kAudioTrackId2;
    audio_track_2.cname = kStream1Cname;
    audio_track_2.set_stream_ids({kStreamId1, kStreamId2});
    audio_track_2.ssrcs.push_back(kAudioTrack2Ssrc);
    audio_desc_2->AddStream(audio_track_2);
    desc_.AddContent(kAudioContentName2, MediaProtocolType::kRtp,
                     absl::WrapUnique(audio_desc_2));
    desc_.AddTransportInfo(
        TransportInfo(kAudioContentName2,
                      MakeTransportDescription(kUfragVoice2, kPwdVoice2)));

    // Audio track 3 has no stream ids.
    AudioContentDescription* audio_desc_3 = CreateAudioContentDescription();
    StreamParams audio_track_3;
    audio_track_3.id = kAudioTrackId3;
    audio_track_3.cname = kStream2Cname;
    audio_track_3.set_stream_ids({});
    audio_track_3.ssrcs.push_back(kAudioTrack3Ssrc);
    audio_desc_3->AddStream(audio_track_3);
    desc_.AddContent(kAudioContentName3, MediaProtocolType::kRtp,
                     absl::WrapUnique(audio_desc_3));
    desc_.AddTransportInfo(
        TransportInfo(kAudioContentName3,
                      MakeTransportDescription(kUfragVoice3, kPwdVoice3)));
    desc_.set_msid_signaling(msid_signaling);
    ASSERT_TRUE(jdesc_.Initialize(desc_.Clone(), jdesc_.session_id(),
                                  jdesc_.session_version()));
  }

  // Turns the existing reference description into a unified plan description
  // with one audio MediaContentDescription that contains one StreamParams with
  // 0 ssrcs.
  void MakeUnifiedPlanDescriptionNoSsrcSignaling() {
    desc_.RemoveContentByName(kVideoContentName);
    desc_.RemoveContentByName(kAudioContentName);
    desc_.RemoveTransportInfoByName(kVideoContentName);
    RemoveVideoCandidates();

    AudioContentDescription* audio_desc = CreateAudioContentDescription();
    StreamParams audio_track;
    audio_track.id = kAudioTrackId1;
    audio_track.set_stream_ids({kStreamId1});
    audio_desc->AddStream(audio_track);
    desc_.AddContent(kAudioContentName, MediaProtocolType::kRtp,
                     absl::WrapUnique(audio_desc));

    // Enable signaling a=msid lines.
    desc_.set_msid_signaling(cricket::kMsidSignalingMediaSection |
                             cricket::kMsidSignalingSemantic);
    ASSERT_TRUE(jdesc_.Initialize(desc_.Clone(), jdesc_.session_id(),
                                  jdesc_.session_version()));
  }

  // Creates a video content description with no streams, and some default
  // configuration.
  VideoContentDescription* CreateVideoContentDescription() {
    VideoContentDescription* video = new VideoContentDescription();
    video->set_protocol(cricket::kMediaProtocolSavpf);
    video->AddCodec(cricket::CreateVideoCodec(120, "VP8"));
    return video;
  }

  void CompareMediaContentDescription(
      const cricket::MediaContentDescription* cd1,
      const cricket::MediaContentDescription* cd2) {
    // type
    EXPECT_EQ(cd1->type(), cd2->type());

    // content direction
    EXPECT_EQ(cd1->direction(), cd2->direction());

    // rtcp_mux
    EXPECT_EQ(cd1->rtcp_mux(), cd2->rtcp_mux());

    // rtcp_reduced_size
    EXPECT_EQ(cd1->rtcp_reduced_size(), cd2->rtcp_reduced_size());

    // protocol
    // Use an equivalence class here, for old and new versions of the
    // protocol description.
    if (cd1->protocol() == cricket::kMediaProtocolDtlsSctp ||
        cd1->protocol() == cricket::kMediaProtocolUdpDtlsSctp ||
        cd1->protocol() == cricket::kMediaProtocolTcpDtlsSctp) {
      const bool cd2_is_also_dtls_sctp =
          cd2->protocol() == cricket::kMediaProtocolDtlsSctp ||
          cd2->protocol() == cricket::kMediaProtocolUdpDtlsSctp ||
          cd2->protocol() == cricket::kMediaProtocolTcpDtlsSctp;
      EXPECT_TRUE(cd2_is_also_dtls_sctp);
    } else {
      EXPECT_EQ(cd1->protocol(), cd2->protocol());
    }

    // codecs
    EXPECT_EQ(cd1->codecs(), cd2->codecs());

    // bandwidth
    EXPECT_EQ(cd1->bandwidth(), cd2->bandwidth());

    // streams
    EXPECT_EQ(cd1->streams(), cd2->streams());

    // extmap-allow-mixed
    EXPECT_EQ(cd1->extmap_allow_mixed_enum(), cd2->extmap_allow_mixed_enum());

    // extmap
    ASSERT_EQ(cd1->rtp_header_extensions().size(),
              cd2->rtp_header_extensions().size());
    for (size_t i = 0; i < cd1->rtp_header_extensions().size(); ++i) {
      const RtpExtension ext1 = cd1->rtp_header_extensions().at(i);
      const RtpExtension ext2 = cd2->rtp_header_extensions().at(i);
      EXPECT_EQ(ext1.uri, ext2.uri);
      EXPECT_EQ(ext1.id, ext2.id);
      EXPECT_EQ(ext1.encrypt, ext2.encrypt);
    }
  }

  void CompareRidDescriptionIds(const std::vector<RidDescription>& rids,
                                const std::vector<std::string>& ids) {
    // Order of elements does not matter, only equivalence of sets.
    EXPECT_EQ(rids.size(), ids.size());
    for (const std::string& id : ids) {
      EXPECT_EQ(1l, absl::c_count_if(rids, [id](const RidDescription& rid) {
                  return rid.rid == id;
                }));
    }
  }

  void CompareSimulcastDescription(const SimulcastDescription& simulcast1,
                                   const SimulcastDescription& simulcast2) {
    EXPECT_EQ(simulcast1.send_layers().size(), simulcast2.send_layers().size());
    EXPECT_EQ(simulcast1.receive_layers().size(),
              simulcast2.receive_layers().size());
  }

  void CompareSctpDataContentDescription(
      const SctpDataContentDescription* dcd1,
      const SctpDataContentDescription* dcd2) {
    EXPECT_EQ(dcd1->use_sctpmap(), dcd2->use_sctpmap());
    EXPECT_EQ(dcd1->port(), dcd2->port());
    EXPECT_EQ(dcd1->max_message_size(), dcd2->max_message_size());
  }

  void CompareSessionDescription(const SessionDescription& desc1,
                                 const SessionDescription& desc2) {
    // Compare content descriptions.
    if (desc1.contents().size() != desc2.contents().size()) {
      ADD_FAILURE();
      return;
    }
    for (size_t i = 0; i < desc1.contents().size(); ++i) {
      const cricket::ContentInfo& c1 = desc1.contents().at(i);
      const cricket::ContentInfo& c2 = desc2.contents().at(i);
      // ContentInfo properties.
      EXPECT_EQ(c1.name, c2.name);
      EXPECT_EQ(c1.type, c2.type);
      EXPECT_EQ(c1.rejected, c2.rejected);
      EXPECT_EQ(c1.bundle_only, c2.bundle_only);

      ASSERT_EQ(IsAudioContent(&c1), IsAudioContent(&c2));
      if (IsAudioContent(&c1)) {
        CompareMediaContentDescription(c1.media_description(),
                                       c2.media_description());
      }

      ASSERT_EQ(IsVideoContent(&c1), IsVideoContent(&c2));
      if (IsVideoContent(&c1)) {
        CompareMediaContentDescription(c1.media_description(),
                                       c2.media_description());
      }

      ASSERT_EQ(IsDataContent(&c1), IsDataContent(&c2));
      if (c1.media_description()->as_sctp()) {
        ASSERT_TRUE(c2.media_description()->as_sctp());
        const SctpDataContentDescription* scd1 =
            c1.media_description()->as_sctp();
        const SctpDataContentDescription* scd2 =
            c2.media_description()->as_sctp();
        CompareSctpDataContentDescription(scd1, scd2);
      }

      CompareSimulcastDescription(
          c1.media_description()->simulcast_description(),
          c2.media_description()->simulcast_description());
    }

    // group
    const cricket::ContentGroups groups1 = desc1.groups();
    const cricket::ContentGroups groups2 = desc2.groups();
    EXPECT_EQ(groups1.size(), groups1.size());
    if (groups1.size() != groups2.size()) {
      ADD_FAILURE();
      return;
    }
    for (size_t i = 0; i < groups1.size(); ++i) {
      const cricket::ContentGroup group1 = groups1.at(i);
      const cricket::ContentGroup group2 = groups2.at(i);
      EXPECT_EQ(group1.semantics(), group2.semantics());
      const cricket::ContentNames names1 = group1.content_names();
      const cricket::ContentNames names2 = group2.content_names();
      EXPECT_EQ(names1.size(), names2.size());
      if (names1.size() != names2.size()) {
        ADD_FAILURE();
        return;
      }
      cricket::ContentNames::const_iterator iter1 = names1.begin();
      cricket::ContentNames::const_iterator iter2 = names2.begin();
      while (iter1 != names1.end()) {
        EXPECT_EQ(*iter1++, *iter2++);
      }
    }

    // transport info
    const cricket::TransportInfos transports1 = desc1.transport_infos();
    const cricket::TransportInfos transports2 = desc2.transport_infos();
    EXPECT_EQ(transports1.size(), transports2.size());
    if (transports1.size() != transports2.size()) {
      ADD_FAILURE();
      return;
    }
    for (size_t i = 0; i < transports1.size(); ++i) {
      const cricket::TransportInfo transport1 = transports1.at(i);
      const cricket::TransportInfo transport2 = transports2.at(i);
      EXPECT_EQ(transport1.content_name, transport2.content_name);
      EXPECT_EQ(transport1.description.ice_ufrag,
                transport2.description.ice_ufrag);
      EXPECT_EQ(transport1.description.ice_pwd, transport2.description.ice_pwd);
      EXPECT_EQ(transport1.description.ice_mode,
                transport2.description.ice_mode);
      if (transport1.description.identity_fingerprint) {
        if (!transport2.description.identity_fingerprint) {
          ADD_FAILURE() << "transport[" << i
                        << "]: left transport has fingerprint, right transport "
                           "does not have it";
        } else {
          EXPECT_EQ(*transport1.description.identity_fingerprint,
                    *transport2.description.identity_fingerprint);
        }
      } else {
        EXPECT_EQ(transport1.description.identity_fingerprint.get(),
                  transport2.description.identity_fingerprint.get());
      }
      EXPECT_EQ(transport1.description.transport_options,
                transport2.description.transport_options);
    }

    // global attributes
    EXPECT_EQ(desc1.msid_signaling(), desc2.msid_signaling());
    EXPECT_EQ(desc1.extmap_allow_mixed(), desc2.extmap_allow_mixed());
  }

  bool CompareSessionDescription(const JsepSessionDescription& desc1,
                                 const JsepSessionDescription& desc2) {
    EXPECT_EQ(desc1.session_id(), desc2.session_id());
    EXPECT_EQ(desc1.session_version(), desc2.session_version());
    CompareSessionDescription(*desc1.description(), *desc2.description());
    if (desc1.number_of_mediasections() != desc2.number_of_mediasections())
      return false;
    for (size_t i = 0; i < desc1.number_of_mediasections(); ++i) {
      const IceCandidateCollection* cc1 = desc1.candidates(i);
      const IceCandidateCollection* cc2 = desc2.candidates(i);
      if (cc1->count() != cc2->count()) {
        ADD_FAILURE();
        return false;
      }
      for (size_t j = 0; j < cc1->count(); ++j) {
        const IceCandidateInterface* c1 = cc1->at(j);
        const IceCandidateInterface* c2 = cc2->at(j);
        EXPECT_EQ(c1->sdp_mid(), c2->sdp_mid());
        EXPECT_EQ(c1->sdp_mline_index(), c2->sdp_mline_index());
        EXPECT_TRUE(c1->candidate().IsEquivalent(c2->candidate()));
      }
    }
    return true;
  }

  // Disable the ice-ufrag and ice-pwd in given `sdp` message by replacing
  // them with invalid keywords so that the parser will just ignore them.
  bool RemoveCandidateUfragPwd(std::string* sdp) {
    absl::StrReplaceAll(
        {{"a=ice-ufrag", "a=xice-ufrag"}, {"a=ice-pwd", "a=xice-pwd"}}, sdp);
    return true;
  }

  // Update the candidates in `jdesc` to use the given `ufrag` and `pwd`.
  bool UpdateCandidateUfragPwd(JsepSessionDescription* jdesc,
                               int mline_index,
                               const std::string& ufrag,
                               const std::string& pwd) {
    std::string content_name;
    if (mline_index == 0) {
      content_name = kAudioContentName;
    } else if (mline_index == 1) {
      content_name = kVideoContentName;
    } else {
      RTC_DCHECK_NOTREACHED();
    }
    TransportInfo transport_info(content_name,
                                 MakeTransportDescription(ufrag, pwd));
    SessionDescription* desc =
        const_cast<SessionDescription*>(jdesc->description());
    desc->RemoveTransportInfoByName(content_name);
    desc->AddTransportInfo(transport_info);
    for (size_t i = 0; i < jdesc_.number_of_mediasections(); ++i) {
      const IceCandidateCollection* cc = jdesc_.candidates(i);
      for (size_t j = 0; j < cc->count(); ++j) {
        if (cc->at(j)->sdp_mline_index() == mline_index) {
          const_cast<Candidate&>(cc->at(j)->candidate()).set_username(ufrag);
          const_cast<Candidate&>(cc->at(j)->candidate()).set_password(pwd);
        }
      }
    }
    return true;
  }

  void AddIceOptions(const std::string& content_name,
                     const std::vector<std::string>& transport_options) {
    ASSERT_TRUE(desc_.GetTransportInfoByName(content_name) != NULL);
    cricket::TransportInfo transport_info =
        *(desc_.GetTransportInfoByName(content_name));
    desc_.RemoveTransportInfoByName(content_name);
    transport_info.description.transport_options = transport_options;
    desc_.AddTransportInfo(transport_info);
  }

  void SetIceUfragPwd(const std::string& content_name,
                      const std::string& ice_ufrag,
                      const std::string& ice_pwd) {
    ASSERT_TRUE(desc_.GetTransportInfoByName(content_name) != NULL);
    cricket::TransportInfo transport_info =
        *(desc_.GetTransportInfoByName(content_name));
    desc_.RemoveTransportInfoByName(content_name);
    transport_info.description.ice_ufrag = ice_ufrag;
    transport_info.description.ice_pwd = ice_pwd;
    desc_.AddTransportInfo(transport_info);
  }

  void AddExtmap(bool encrypted) {
    audio_desc_ = new AudioContentDescription(*audio_desc_);
    video_desc_ = new VideoContentDescription(*video_desc_);
    audio_desc_->AddRtpHeaderExtension(
        RtpExtension(kExtmapUri, kExtmapId, encrypted));
    video_desc_->AddRtpHeaderExtension(
        RtpExtension(kExtmapUri, kExtmapId, encrypted));
    desc_.RemoveContentByName(kAudioContentName);
    desc_.RemoveContentByName(kVideoContentName);
    desc_.AddContent(kAudioContentName, MediaProtocolType::kRtp,
                     absl::WrapUnique(audio_desc_));
    desc_.AddContent(kVideoContentName, MediaProtocolType::kRtp,
                     absl::WrapUnique(video_desc_));
  }

  // Removes everything in StreamParams from the session description that is
  // used for a=ssrc lines.
  void RemoveSsrcSignalingFromStreamParams() {
    for (cricket::ContentInfo& content_info :
         jdesc_.description()->contents()) {
      // With Unified Plan there should be one StreamParams per m= section.
      StreamParams& stream =
          content_info.media_description()->mutable_streams()[0];
      stream.ssrcs.clear();
      stream.ssrc_groups.clear();
      stream.cname.clear();
    }
  }

  // Removes all a=ssrc lines from the SDP string, except for the
  // "a=ssrc:... cname:..." lines.
  void RemoveSsrcMsidLinesFromSdpString(std::string* sdp_string) {
    const char kAttributeSsrc[] = "a=ssrc";
    const char kAttributeCname[] = "cname";
    size_t ssrc_line_pos = sdp_string->find(kAttributeSsrc);
    while (ssrc_line_pos != std::string::npos) {
      size_t beg_line_pos = sdp_string->rfind('\n', ssrc_line_pos);
      size_t end_line_pos = sdp_string->find('\n', ssrc_line_pos);
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