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/*
* Copyright 2004 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 PC_SESSION_DESCRIPTION_H_
#define PC_SESSION_DESCRIPTION_H_
#include <stddef.h>
#include <stdint.h>
#include <iosfwd>
#include <memory>
#include <string>
#include <vector>
#include "api/crypto_params.h"
#include "api/media_types.h"
#include "api/rtp_parameters.h"
#include "api/rtp_transceiver_interface.h"
#include "media/base/media_channel.h"
#include "media/base/stream_params.h"
#include "p2p/base/transport_description.h"
#include "p2p/base/transport_info.h"
#include "pc/simulcast_description.h"
#include "rtc_base/socket_address.h"
namespace cricket {
typedef std::vector<AudioCodec> AudioCodecs;
typedef std::vector<VideoCodec> VideoCodecs;
typedef std::vector<DataCodec> DataCodecs;
typedef std::vector<CryptoParams> CryptoParamsVec;
typedef std::vector<webrtc::RtpExtension> RtpHeaderExtensions;
// RTC4585 RTP/AVPF
extern const char kMediaProtocolAvpf[];
// RFC5124 RTP/SAVPF
extern const char kMediaProtocolSavpf[];
extern const char kMediaProtocolDtlsSavpf[];
extern const char kMediaProtocolRtpPrefix[];
extern const char kMediaProtocolSctp[];
extern const char kMediaProtocolDtlsSctp[];
extern const char kMediaProtocolUdpDtlsSctp[];
extern const char kMediaProtocolTcpDtlsSctp[];
// Options to control how session descriptions are generated.
const int kAutoBandwidth = -1;
class AudioContentDescription;
class DataContentDescription;
class VideoContentDescription;
// Describes a session description media section. There are subclasses for each
// media type (audio, video, data) that will have additional information.
class MediaContentDescription {
public:
MediaContentDescription() = default;
virtual ~MediaContentDescription() = default;
virtual MediaType type() const = 0;
// Try to cast this media description to an AudioContentDescription. Returns
// nullptr if the cast fails.
virtual AudioContentDescription* as_audio() { return nullptr; }
virtual const AudioContentDescription* as_audio() const { return nullptr; }
// Try to cast this media description to a VideoContentDescription. Returns
// nullptr if the cast fails.
virtual VideoContentDescription* as_video() { return nullptr; }
virtual const VideoContentDescription* as_video() const { return nullptr; }
// Try to cast this media description to a DataContentDescription. Returns
// nullptr if the cast fails.
virtual DataContentDescription* as_data() { return nullptr; }
virtual const DataContentDescription* as_data() const { return nullptr; }
virtual bool has_codecs() const = 0;
virtual MediaContentDescription* Copy() const = 0;
// |protocol| is the expected media transport protocol, such as RTP/AVPF,
// RTP/SAVPF or SCTP/DTLS.
std::string protocol() const { return protocol_; }
void set_protocol(const std::string& protocol) { protocol_ = protocol; }
webrtc::RtpTransceiverDirection direction() const { return direction_; }
void set_direction(webrtc::RtpTransceiverDirection direction) {
direction_ = direction;
}
bool rtcp_mux() const { return rtcp_mux_; }
void set_rtcp_mux(bool mux) { rtcp_mux_ = mux; }
bool rtcp_reduced_size() const { return rtcp_reduced_size_; }
void set_rtcp_reduced_size(bool reduced_size) {
rtcp_reduced_size_ = reduced_size;
}
int bandwidth() const { return bandwidth_; }
void set_bandwidth(int bandwidth) { bandwidth_ = bandwidth; }
const std::vector<CryptoParams>& cryptos() const { return cryptos_; }
void AddCrypto(const CryptoParams& params) { cryptos_.push_back(params); }
void set_cryptos(const std::vector<CryptoParams>& cryptos) {
cryptos_ = cryptos;
}
const RtpHeaderExtensions& rtp_header_extensions() const {
return rtp_header_extensions_;
}
void set_rtp_header_extensions(const RtpHeaderExtensions& extensions) {
rtp_header_extensions_ = extensions;
rtp_header_extensions_set_ = true;
}
void AddRtpHeaderExtension(const webrtc::RtpExtension& ext) {
rtp_header_extensions_.push_back(ext);
rtp_header_extensions_set_ = true;
}
void AddRtpHeaderExtension(const cricket::RtpHeaderExtension& ext) {
webrtc::RtpExtension webrtc_extension;
webrtc_extension.uri = ext.uri;
webrtc_extension.id = ext.id;
rtp_header_extensions_.push_back(webrtc_extension);
rtp_header_extensions_set_ = true;
}
void ClearRtpHeaderExtensions() {
rtp_header_extensions_.clear();
rtp_header_extensions_set_ = true;
}
// We can't always tell if an empty list of header extensions is
// because the other side doesn't support them, or just isn't hooked up to
// signal them. For now we assume an empty list means no signaling, but
// provide the ClearRtpHeaderExtensions method to allow "no support" to be
// clearly indicated (i.e. when derived from other information).
bool rtp_header_extensions_set() const { return rtp_header_extensions_set_; }
const StreamParamsVec& streams() const { return send_streams_; }
// TODO(pthatcher): Remove this by giving mediamessage.cc access
// to MediaContentDescription
StreamParamsVec& mutable_streams() { return send_streams_; }
void AddStream(const StreamParams& stream) {
send_streams_.push_back(stream);
}
// Legacy streams have an ssrc, but nothing else.
void AddLegacyStream(uint32_t ssrc) {
send_streams_.push_back(StreamParams::CreateLegacy(ssrc));
}
void AddLegacyStream(uint32_t ssrc, uint32_t fid_ssrc) {
StreamParams sp = StreamParams::CreateLegacy(ssrc);
sp.AddFidSsrc(ssrc, fid_ssrc);
send_streams_.push_back(sp);
}
// Sets the CNAME of all StreamParams if it have not been set.
void SetCnameIfEmpty(const std::string& cname) {
for (cricket::StreamParamsVec::iterator it = send_streams_.begin();
it != send_streams_.end(); ++it) {
if (it->cname.empty())
it->cname = cname;
}
}
uint32_t first_ssrc() const {
if (send_streams_.empty()) {
return 0;
}
return send_streams_[0].first_ssrc();
}
bool has_ssrcs() const {
if (send_streams_.empty()) {
return false;
}
return send_streams_[0].has_ssrcs();
}
void set_conference_mode(bool enable) { conference_mode_ = enable; }
bool conference_mode() const { return conference_mode_; }
// https://tools.ietf.org/html/rfc4566#section-5.7
// May be present at the media or session level of SDP. If present at both
// levels, the media-level attribute overwrites the session-level one.
void set_connection_address(const rtc::SocketAddress& address) {
connection_address_ = address;
}
const rtc::SocketAddress& connection_address() const {
return connection_address_;
}
// Determines if it's allowed to mix one- and two-byte rtp header extensions
// within the same rtp stream.
enum ExtmapAllowMixed { kNo, kSession, kMedia };
void set_extmap_allow_mixed_enum(ExtmapAllowMixed new_extmap_allow_mixed) {
if (new_extmap_allow_mixed == kMedia &&
extmap_allow_mixed_enum_ == kSession) {
// Do not downgrade from session level to media level.
return;
}
extmap_allow_mixed_enum_ = new_extmap_allow_mixed;
}
ExtmapAllowMixed extmap_allow_mixed_enum() const {
return extmap_allow_mixed_enum_;
}
bool extmap_allow_mixed() const { return extmap_allow_mixed_enum_ != kNo; }
// Simulcast functionality.
virtual bool HasSimulcast() const { return !simulcast_.empty(); }
virtual SimulcastDescription& simulcast_description() { return simulcast_; }
virtual const SimulcastDescription& simulcast_description() const {
return simulcast_;
}
virtual void set_simulcast_description(
const SimulcastDescription& simulcast) {
simulcast_ = simulcast;
}
protected:
bool rtcp_mux_ = false;
bool rtcp_reduced_size_ = false;
int bandwidth_ = kAutoBandwidth;
std::string protocol_;
std::vector<CryptoParams> cryptos_;
std::vector<webrtc::RtpExtension> rtp_header_extensions_;
bool rtp_header_extensions_set_ = false;
StreamParamsVec send_streams_;
bool conference_mode_ = false;
webrtc::RtpTransceiverDirection direction_ =
webrtc::RtpTransceiverDirection::kSendRecv;
rtc::SocketAddress connection_address_;
// Mixed one- and two-byte header not included in offer on media level or
// session level, but we will respond that we support it. The plan is to add
// it to our offer on session level. See todo in SessionDescription.
ExtmapAllowMixed extmap_allow_mixed_enum_ = kNo;
SimulcastDescription simulcast_;
};
// TODO(bugs.webrtc.org/8620): Remove this alias once downstream projects have
// updated.
using ContentDescription = MediaContentDescription;
template <class C>
class MediaContentDescriptionImpl : public MediaContentDescription {
public:
typedef C CodecType;
// Codecs should be in preference order (most preferred codec first).
const std::vector<C>& codecs() const { return codecs_; }
void set_codecs(const std::vector<C>& codecs) { codecs_ = codecs; }
virtual bool has_codecs() const { return !codecs_.empty(); }
bool HasCodec(int id) {
bool found = false;
for (typename std::vector<C>::iterator iter = codecs_.begin();
iter != codecs_.end(); ++iter) {
if (iter->id == id) {
found = true;
break;
}
}
return found;
}
void AddCodec(const C& codec) { codecs_.push_back(codec); }
void AddOrReplaceCodec(const C& codec) {
for (typename std::vector<C>::iterator iter = codecs_.begin();
iter != codecs_.end(); ++iter) {
if (iter->id == codec.id) {
*iter = codec;
return;
}
}
AddCodec(codec);
}
void AddCodecs(const std::vector<C>& codecs) {
typename std::vector<C>::const_iterator codec;
for (codec = codecs.begin(); codec != codecs.end(); ++codec) {
AddCodec(*codec);
}
}
private:
std::vector<C> codecs_;
};
class AudioContentDescription : public MediaContentDescriptionImpl<AudioCodec> {
public:
AudioContentDescription() {}
virtual AudioContentDescription* Copy() const {
return new AudioContentDescription(*this);
}
virtual MediaType type() const { return MEDIA_TYPE_AUDIO; }
virtual AudioContentDescription* as_audio() { return this; }
virtual const AudioContentDescription* as_audio() const { return this; }
};
class VideoContentDescription : public MediaContentDescriptionImpl<VideoCodec> {
public:
virtual VideoContentDescription* Copy() const {
return new VideoContentDescription(*this);
}
virtual MediaType type() const { return MEDIA_TYPE_VIDEO; }
virtual VideoContentDescription* as_video() { return this; }
virtual const VideoContentDescription* as_video() const { return this; }
};
class DataContentDescription : public MediaContentDescriptionImpl<DataCodec> {
public:
DataContentDescription() {}
virtual DataContentDescription* Copy() const {
return new DataContentDescription(*this);
}
virtual MediaType type() const { return MEDIA_TYPE_DATA; }
virtual DataContentDescription* as_data() { return this; }
virtual const DataContentDescription* as_data() const { return this; }
bool use_sctpmap() const { return use_sctpmap_; }
void set_use_sctpmap(bool enable) { use_sctpmap_ = enable; }
private:
bool use_sctpmap_ = true;
};
// Protocol used for encoding media. This is the "top level" protocol that may
// be wrapped by zero or many transport protocols (UDP, ICE, etc.).
enum class MediaProtocolType {
kRtp, // Section will use the RTP protocol (e.g., for audio or video).
// https://tools.ietf.org/html/rfc3550
kSctp // Section will use the SCTP protocol (e.g., for a data channel).
// https://tools.ietf.org/html/rfc4960
};
// TODO(bugs.webrtc.org/8620): Remove once downstream projects have updated.
constexpr MediaProtocolType NS_JINGLE_RTP = MediaProtocolType::kRtp;
constexpr MediaProtocolType NS_JINGLE_DRAFT_SCTP = MediaProtocolType::kSctp;
// Represents a session description section. Most information about the section
// is stored in the description, which is a subclass of MediaContentDescription.
struct ContentInfo {
friend class SessionDescription;
explicit ContentInfo(MediaProtocolType type) : type(type) {}
// Alias for |name|.
std::string mid() const { return name; }
void set_mid(const std::string& mid) { this->name = mid; }
// Alias for |description|.
MediaContentDescription* media_description() { return description; }
const MediaContentDescription* media_description() const {
return description;
}
void set_media_description(MediaContentDescription* desc) {
description = desc;
}
// TODO(bugs.webrtc.org/8620): Rename this to mid.
std::string name;
MediaProtocolType type;
bool rejected = false;
bool bundle_only = false;
// TODO(bugs.webrtc.org/8620): Switch to the getter and setter, and make this
// private.
MediaContentDescription* description = nullptr;
};
typedef std::vector<std::string> ContentNames;
// This class provides a mechanism to aggregate different media contents into a
// group. This group can also be shared with the peers in a pre-defined format.
// GroupInfo should be populated only with the |content_name| of the
// MediaDescription.
class ContentGroup {
public:
explicit ContentGroup(const std::string& semantics);
ContentGroup(const ContentGroup&);
ContentGroup(ContentGroup&&);
ContentGroup& operator=(const ContentGroup&);
ContentGroup& operator=(ContentGroup&&);
~ContentGroup();
const std::string& semantics() const { return semantics_; }
const ContentNames& content_names() const { return content_names_; }
const std::string* FirstContentName() const;
bool HasContentName(const std::string& content_name) const;
void AddContentName(const std::string& content_name);
bool RemoveContentName(const std::string& content_name);
private:
std::string semantics_;
ContentNames content_names_;
};
typedef std::vector<ContentInfo> ContentInfos;
typedef std::vector<ContentGroup> ContentGroups;
const ContentInfo* FindContentInfoByName(const ContentInfos& contents,
const std::string& name);
const ContentInfo* FindContentInfoByType(const ContentInfos& contents,
const std::string& type);
// Determines how the MSID will be signaled in the SDP. These can be used as
// flags to indicate both or none.
enum MsidSignaling {
// Signal MSID with one a=msid line in the media section.
kMsidSignalingMediaSection = 0x1,
// Signal MSID with a=ssrc: msid lines in the media section.
kMsidSignalingSsrcAttribute = 0x2
};
// Describes a collection of contents, each with its own name and
// type. Analogous to a <jingle> or <session> stanza. Assumes that
// contents are unique be name, but doesn't enforce that.
class SessionDescription {
public:
SessionDescription();
~SessionDescription();
std::unique_ptr<SessionDescription> Clone() const;
// Older API - to be deprecated. Still expects caller to take ownership.
SessionDescription* Copy() const;
struct MediaTransportSetting;
// Content accessors.
const ContentInfos& contents() const { return contents_; }
ContentInfos& contents() { return contents_; }
const ContentInfo* GetContentByName(const std::string& name) const;
ContentInfo* GetContentByName(const std::string& name);
const MediaContentDescription* GetContentDescriptionByName(
const std::string& name) const;
MediaContentDescription* GetContentDescriptionByName(const std::string& name);
const ContentInfo* FirstContentByType(MediaProtocolType type) const;
const ContentInfo* FirstContent() const;
// Content mutators.
// Adds a content to this description. Takes ownership of ContentDescription*.
void AddContent(const std::string& name,
MediaProtocolType type,
MediaContentDescription* description);
void AddContent(const std::string& name,
MediaProtocolType type,
bool rejected,
MediaContentDescription* description);
void AddContent(const std::string& name,
MediaProtocolType type,
bool rejected,
bool bundle_only,
MediaContentDescription* description);
void AddContent(ContentInfo* content);
bool RemoveContentByName(const std::string& name);
// Transport accessors.
const TransportInfos& transport_infos() const { return transport_infos_; }
TransportInfos& transport_infos() { return transport_infos_; }
const TransportInfo* GetTransportInfoByName(const std::string& name) const;
TransportInfo* GetTransportInfoByName(const std::string& name);
const TransportDescription* GetTransportDescriptionByName(
const std::string& name) const {
const TransportInfo* tinfo = GetTransportInfoByName(name);
return tinfo ? &tinfo->description : NULL;
}
// Transport mutators.
void set_transport_infos(const TransportInfos& transport_infos) {
transport_infos_ = transport_infos;
}
// Adds a TransportInfo to this description.
void AddTransportInfo(const TransportInfo& transport_info);
bool RemoveTransportInfoByName(const std::string& name);
// Group accessors.
const ContentGroups& groups() const { return content_groups_; }
const ContentGroup* GetGroupByName(const std::string& name) const;
bool HasGroup(const std::string& name) const;
// Group mutators.
void AddGroup(const ContentGroup& group) { content_groups_.push_back(group); }
// Remove the first group with the same semantics specified by |name|.
void RemoveGroupByName(const std::string& name);
// Global attributes.
void set_msid_supported(bool supported) { msid_supported_ = supported; }
bool msid_supported() const { return msid_supported_; }
// Determines how the MSIDs were/will be signaled. Flag value composed of
// MsidSignaling bits (see enum above).
void set_msid_signaling(int msid_signaling) {
msid_signaling_ = msid_signaling;
}
int msid_signaling() const { return msid_signaling_; }
// Determines if it's allowed to mix one- and two-byte rtp header extensions
// within the same rtp stream.
void set_extmap_allow_mixed(bool supported) {
extmap_allow_mixed_ = supported;
MediaContentDescription::ExtmapAllowMixed media_level_setting =
supported ? MediaContentDescription::kSession
: MediaContentDescription::kNo;
for (auto& content : contents_) {
// Do not set to kNo if the current setting is kMedia.
if (supported || content.media_description()->extmap_allow_mixed_enum() !=
MediaContentDescription::kMedia) {
content.media_description()->set_extmap_allow_mixed_enum(
media_level_setting);
}
}
}
bool extmap_allow_mixed() const { return extmap_allow_mixed_; }
// Adds the media transport setting.
// Media transport name uniquely identifies the type of media transport.
// The name cannot be empty, or repeated in the previously added transport
// settings.
void AddMediaTransportSetting(const std::string& media_transport_name,
const std::string& media_transport_setting) {
RTC_DCHECK(!media_transport_name.empty());
for (const auto& setting : media_transport_settings_) {
RTC_DCHECK(media_transport_name != setting.transport_name)
<< "MediaTransportSetting was already registered, transport_name="
<< setting.transport_name;
}
media_transport_settings_.push_back(
{media_transport_name, media_transport_setting});
}
// Gets the media transport settings, in order of preference.
const std::vector<MediaTransportSetting>& MediaTransportSettings() const {
return media_transport_settings_;
}
struct MediaTransportSetting {
std::string transport_name;
std::string transport_setting;
};
private:
SessionDescription(const SessionDescription&);
ContentInfos contents_;
TransportInfos transport_infos_;
ContentGroups content_groups_;
bool msid_supported_ = true;
// Default to what Plan B would do.
// TODO(bugs.webrtc.org/8530): Change default to kMsidSignalingMediaSection.
int msid_signaling_ = kMsidSignalingSsrcAttribute;
// TODO(webrtc:9985): Activate mixed one- and two-byte header extension in
// offer at session level. It's currently not included in offer by default
// because clients prior to https://bugs.webrtc.org/9712 cannot parse this
// correctly. If it's included in offer to us we will respond that we support
// it.
bool extmap_allow_mixed_ = false;
std::vector<MediaTransportSetting> media_transport_settings_;
};
// Indicates whether a session description was sent by the local client or
// received from the remote client.
enum ContentSource { CS_LOCAL, CS_REMOTE };
} // namespace cricket
#endif // PC_SESSION_DESCRIPTION_H_