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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.
*/
// Types and classes used in media session descriptions.
#ifndef PC_MEDIA_SESSION_H_
#define PC_MEDIA_SESSION_H_
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "api/media_types.h"
#include "media/base/media_constants.h"
#include "media/base/media_engine.h" // For DataChannelType
#include "p2p/base/ice_credentials_iterator.h"
#include "p2p/base/transport_description_factory.h"
#include "pc/jsep_transport.h"
#include "pc/media_protocol_names.h"
#include "pc/session_description.h"
#include "rtc_base/unique_id_generator.h"
namespace cricket {
class ChannelManager;
// Default RTCP CNAME for unit tests.
const char kDefaultRtcpCname[] = "DefaultRtcpCname";
// Options for an RtpSender contained with an media description/"m=" section.
// Note: Spec-compliant Simulcast and legacy simulcast are mutually exclusive.
struct SenderOptions {
std::string track_id;
std::vector<std::string> stream_ids;
// Use RIDs and Simulcast Layers to indicate spec-compliant Simulcast.
std::vector<RidDescription> rids;
SimulcastLayerList simulcast_layers;
// Use |num_sim_layers| to indicate legacy simulcast.
int num_sim_layers;
};
// Options for an individual media description/"m=" section.
struct MediaDescriptionOptions {
MediaDescriptionOptions(MediaType type,
const std::string& mid,
webrtc::RtpTransceiverDirection direction,
bool stopped)
: type(type), mid(mid), direction(direction), stopped(stopped) {}
// TODO(deadbeef): When we don't support Plan B, there will only be one
// sender per media description and this can be simplified.
void AddAudioSender(const std::string& track_id,
const std::vector<std::string>& stream_ids);
void AddVideoSender(const std::string& track_id,
const std::vector<std::string>& stream_ids,
const std::vector<RidDescription>& rids,
const SimulcastLayerList& simulcast_layers,
int num_sim_layers);
// Internally just uses sender_options.
void AddRtpDataChannel(const std::string& track_id,
const std::string& stream_id);
MediaType type;
std::string mid;
webrtc::RtpTransceiverDirection direction;
bool stopped;
TransportOptions transport_options;
// Note: There's no equivalent "RtpReceiverOptions" because only send
// stream information goes in the local descriptions.
std::vector<SenderOptions> sender_options;
std::vector<webrtc::RtpCodecCapability> codec_preferences;
absl::optional<std::string> alt_protocol;
private:
// Doesn't DCHECK on |type|.
void AddSenderInternal(const std::string& track_id,
const std::vector<std::string>& stream_ids,
const std::vector<RidDescription>& rids,
const SimulcastLayerList& simulcast_layers,
int num_sim_layers);
};
// Provides a mechanism for describing how m= sections should be generated.
// The m= section with index X will use media_description_options[X]. There
// must be an option for each existing section if creating an answer, or a
// subsequent offer.
struct MediaSessionOptions {
MediaSessionOptions() {}
bool has_audio() const { return HasMediaDescription(MEDIA_TYPE_AUDIO); }
bool has_video() const { return HasMediaDescription(MEDIA_TYPE_VIDEO); }
bool has_data() const { return HasMediaDescription(MEDIA_TYPE_DATA); }
bool HasMediaDescription(MediaType type) const;
DataChannelType data_channel_type = DCT_NONE;
bool vad_enabled = true; // When disabled, removes all CN codecs from SDP.
bool rtcp_mux_enabled = true;
bool bundle_enabled = false;
bool offer_extmap_allow_mixed = false;
bool raw_packetization_for_video = false;
std::string rtcp_cname = kDefaultRtcpCname;
webrtc::CryptoOptions crypto_options;
// List of media description options in the same order that the media
// descriptions will be generated.
std::vector<MediaDescriptionOptions> media_description_options;
std::vector<IceParameters> pooled_ice_credentials;
// An optional media transport settings.
// In the future we may consider using a vector here, to indicate multiple
// supported transports.
absl::optional<cricket::SessionDescription::MediaTransportSetting>
media_transport_settings;
// Use the draft-ietf-mmusic-sctp-sdp-03 obsolete syntax for SCTP
// datachannels.
// Default is true for backwards compatibility with clients that use
// this internal interface.
bool use_obsolete_sctp_sdp = true;
};
// Creates media session descriptions according to the supplied codecs and
// other fields, as well as the supplied per-call options.
// When creating answers, performs the appropriate negotiation
// of the various fields to determine the proper result.
class MediaSessionDescriptionFactory {
public:
// Simple constructor that does not set any configuration for the factory.
// When using this constructor, the methods below can be used to set the
// configuration.
// The TransportDescriptionFactory and the UniqueRandomIdGenerator are not
// owned by MediaSessionDescriptionFactory, so they must be kept alive by the
// user of this class.
MediaSessionDescriptionFactory(const TransportDescriptionFactory* factory,
rtc::UniqueRandomIdGenerator* ssrc_generator);
// This helper automatically sets up the factory to get its configuration
// from the specified ChannelManager.
MediaSessionDescriptionFactory(ChannelManager* cmanager,
const TransportDescriptionFactory* factory,
rtc::UniqueRandomIdGenerator* ssrc_generator);
const AudioCodecs& audio_sendrecv_codecs() const;
const AudioCodecs& audio_send_codecs() const;
const AudioCodecs& audio_recv_codecs() const;
void set_audio_codecs(const AudioCodecs& send_codecs,
const AudioCodecs& recv_codecs);
void set_audio_rtp_header_extensions(const RtpHeaderExtensions& extensions) {
audio_rtp_extensions_ = extensions;
}
RtpHeaderExtensions audio_rtp_header_extensions() const;
const VideoCodecs& video_codecs() const { return video_codecs_; }
void set_video_codecs(const VideoCodecs& codecs) { video_codecs_ = codecs; }
void set_video_rtp_header_extensions(const RtpHeaderExtensions& extensions) {
video_rtp_extensions_ = extensions;
}
RtpHeaderExtensions video_rtp_header_extensions() const;
const RtpDataCodecs& rtp_data_codecs() const { return rtp_data_codecs_; }
void set_rtp_data_codecs(const RtpDataCodecs& codecs) {
rtp_data_codecs_ = codecs;
}
SecurePolicy secure() const { return secure_; }
void set_secure(SecurePolicy s) { secure_ = s; }
void set_enable_encrypted_rtp_header_extensions(bool enable) {
enable_encrypted_rtp_header_extensions_ = enable;
}
void set_is_unified_plan(bool is_unified_plan) {
is_unified_plan_ = is_unified_plan;
}
std::unique_ptr<SessionDescription> CreateOffer(
const MediaSessionOptions& options,
const SessionDescription* current_description) const;
std::unique_ptr<SessionDescription> CreateAnswer(
const SessionDescription* offer,
const MediaSessionOptions& options,
const SessionDescription* current_description) const;
private:
const AudioCodecs& GetAudioCodecsForOffer(
const webrtc::RtpTransceiverDirection& direction) const;
const AudioCodecs& GetAudioCodecsForAnswer(
const webrtc::RtpTransceiverDirection& offer,
const webrtc::RtpTransceiverDirection& answer) const;
void GetCodecsForOffer(
const std::vector<const ContentInfo*>& current_active_contents,
AudioCodecs* audio_codecs,
VideoCodecs* video_codecs,
RtpDataCodecs* rtp_data_codecs) const;
void GetCodecsForAnswer(
const std::vector<const ContentInfo*>& current_active_contents,
const SessionDescription& remote_offer,
AudioCodecs* audio_codecs,
VideoCodecs* video_codecs,
RtpDataCodecs* rtp_data_codecs) const;
void GetRtpHdrExtsToOffer(
const std::vector<const ContentInfo*>& current_active_contents,
bool extmap_allow_mixed,
RtpHeaderExtensions* audio_extensions,
RtpHeaderExtensions* video_extensions) const;
bool AddTransportOffer(const std::string& content_name,
const TransportOptions& transport_options,
const SessionDescription* current_desc,
SessionDescription* offer,
IceCredentialsIterator* ice_credentials) const;
std::unique_ptr<TransportDescription> CreateTransportAnswer(
const std::string& content_name,
const SessionDescription* offer_desc,
const TransportOptions& transport_options,
const SessionDescription* current_desc,
bool require_transport_attributes,
IceCredentialsIterator* ice_credentials) const;
bool AddTransportAnswer(const std::string& content_name,
const TransportDescription& transport_desc,
SessionDescription* answer_desc) const;
// Helpers for adding media contents to the SessionDescription. Returns true
// it succeeds or the media content is not needed, or false if there is any
// error.
bool AddAudioContentForOffer(
const MediaDescriptionOptions& media_description_options,
const MediaSessionOptions& session_options,
const ContentInfo* current_content,
const SessionDescription* current_description,
const RtpHeaderExtensions& audio_rtp_extensions,
const AudioCodecs& audio_codecs,
StreamParamsVec* current_streams,
SessionDescription* desc,
IceCredentialsIterator* ice_credentials) const;
bool AddVideoContentForOffer(
const MediaDescriptionOptions& media_description_options,
const MediaSessionOptions& session_options,
const ContentInfo* current_content,
const SessionDescription* current_description,
const RtpHeaderExtensions& video_rtp_extensions,
const VideoCodecs& video_codecs,
StreamParamsVec* current_streams,
SessionDescription* desc,
IceCredentialsIterator* ice_credentials) const;
bool AddSctpDataContentForOffer(
const MediaDescriptionOptions& media_description_options,
const MediaSessionOptions& session_options,
const ContentInfo* current_content,
const SessionDescription* current_description,
StreamParamsVec* current_streams,
SessionDescription* desc,
IceCredentialsIterator* ice_credentials) const;
bool AddRtpDataContentForOffer(
const MediaDescriptionOptions& media_description_options,
const MediaSessionOptions& session_options,
const ContentInfo* current_content,
const SessionDescription* current_description,
const RtpDataCodecs& rtp_data_codecs,
StreamParamsVec* current_streams,
SessionDescription* desc,
IceCredentialsIterator* ice_credentials) const;
// This function calls either AddRtpDataContentForOffer or
// AddSctpDataContentForOffer depending on protocol.
// The codecs argument is ignored for SCTP.
bool AddDataContentForOffer(
const MediaDescriptionOptions& media_description_options,
const MediaSessionOptions& session_options,
const ContentInfo* current_content,
const SessionDescription* current_description,
const RtpDataCodecs& rtp_data_codecs,
StreamParamsVec* current_streams,
SessionDescription* desc,
IceCredentialsIterator* ice_credentials) const;
bool AddAudioContentForAnswer(
const MediaDescriptionOptions& media_description_options,
const MediaSessionOptions& session_options,
const ContentInfo* offer_content,
const SessionDescription* offer_description,
const ContentInfo* current_content,
const SessionDescription* current_description,
const TransportInfo* bundle_transport,
const AudioCodecs& audio_codecs,
StreamParamsVec* current_streams,
SessionDescription* answer,
IceCredentialsIterator* ice_credentials) const;
bool AddVideoContentForAnswer(
const MediaDescriptionOptions& media_description_options,
const MediaSessionOptions& session_options,
const ContentInfo* offer_content,
const SessionDescription* offer_description,
const ContentInfo* current_content,
const SessionDescription* current_description,
const TransportInfo* bundle_transport,
const VideoCodecs& video_codecs,
StreamParamsVec* current_streams,
SessionDescription* answer,
IceCredentialsIterator* ice_credentials) const;
bool AddDataContentForAnswer(
const MediaDescriptionOptions& media_description_options,
const MediaSessionOptions& session_options,
const ContentInfo* offer_content,
const SessionDescription* offer_description,
const ContentInfo* current_content,
const SessionDescription* current_description,
const TransportInfo* bundle_transport,
const RtpDataCodecs& rtp_data_codecs,
StreamParamsVec* current_streams,
SessionDescription* answer,
IceCredentialsIterator* ice_credentials) const;
void ComputeAudioCodecsIntersectionAndUnion();
bool is_unified_plan_ = false;
AudioCodecs audio_send_codecs_;
AudioCodecs audio_recv_codecs_;
// Intersection of send and recv.
AudioCodecs audio_sendrecv_codecs_;
// Union of send and recv.
AudioCodecs all_audio_codecs_;
RtpHeaderExtensions audio_rtp_extensions_;
VideoCodecs video_codecs_;
RtpHeaderExtensions video_rtp_extensions_;
RtpDataCodecs rtp_data_codecs_;
// This object is not owned by the channel so it must outlive it.
rtc::UniqueRandomIdGenerator* const ssrc_generator_;
bool enable_encrypted_rtp_header_extensions_ = false;
// TODO(zhihuang): Rename secure_ to sdec_policy_; rename the related getter
// and setter.
SecurePolicy secure_ = SEC_DISABLED;
const TransportDescriptionFactory* transport_desc_factory_;
};
// Convenience functions.
bool IsMediaContent(const ContentInfo* content);
bool IsAudioContent(const ContentInfo* content);
bool IsVideoContent(const ContentInfo* content);
bool IsDataContent(const ContentInfo* content);
const ContentInfo* GetFirstMediaContent(const ContentInfos& contents,
MediaType media_type);
const ContentInfo* GetFirstAudioContent(const ContentInfos& contents);
const ContentInfo* GetFirstVideoContent(const ContentInfos& contents);
const ContentInfo* GetFirstDataContent(const ContentInfos& contents);
const ContentInfo* GetFirstMediaContent(const SessionDescription* sdesc,
MediaType media_type);
const ContentInfo* GetFirstAudioContent(const SessionDescription* sdesc);
const ContentInfo* GetFirstVideoContent(const SessionDescription* sdesc);
const ContentInfo* GetFirstDataContent(const SessionDescription* sdesc);
const AudioContentDescription* GetFirstAudioContentDescription(
const SessionDescription* sdesc);
const VideoContentDescription* GetFirstVideoContentDescription(
const SessionDescription* sdesc);
const RtpDataContentDescription* GetFirstRtpDataContentDescription(
const SessionDescription* sdesc);
const SctpDataContentDescription* GetFirstSctpDataContentDescription(
const SessionDescription* sdesc);
// Non-const versions of the above functions.
// Useful when modifying an existing description.
ContentInfo* GetFirstMediaContent(ContentInfos* contents, MediaType media_type);
ContentInfo* GetFirstAudioContent(ContentInfos* contents);
ContentInfo* GetFirstVideoContent(ContentInfos* contents);
ContentInfo* GetFirstDataContent(ContentInfos* contents);
ContentInfo* GetFirstMediaContent(SessionDescription* sdesc,
MediaType media_type);
ContentInfo* GetFirstAudioContent(SessionDescription* sdesc);
ContentInfo* GetFirstVideoContent(SessionDescription* sdesc);
ContentInfo* GetFirstDataContent(SessionDescription* sdesc);
AudioContentDescription* GetFirstAudioContentDescription(
SessionDescription* sdesc);
VideoContentDescription* GetFirstVideoContentDescription(
SessionDescription* sdesc);
RtpDataContentDescription* GetFirstRtpDataContentDescription(
SessionDescription* sdesc);
SctpDataContentDescription* GetFirstSctpDataContentDescription(
SessionDescription* sdesc);
// Helper functions to return crypto suites used for SDES.
void GetSupportedAudioSdesCryptoSuites(
const webrtc::CryptoOptions& crypto_options,
std::vector<int>* crypto_suites);
void GetSupportedVideoSdesCryptoSuites(
const webrtc::CryptoOptions& crypto_options,
std::vector<int>* crypto_suites);
void GetSupportedDataSdesCryptoSuites(
const webrtc::CryptoOptions& crypto_options,
std::vector<int>* crypto_suites);
void GetSupportedAudioSdesCryptoSuiteNames(
const webrtc::CryptoOptions& crypto_options,
std::vector<std::string>* crypto_suite_names);
void GetSupportedVideoSdesCryptoSuiteNames(
const webrtc::CryptoOptions& crypto_options,
std::vector<std::string>* crypto_suite_names);
void GetSupportedDataSdesCryptoSuiteNames(
const webrtc::CryptoOptions& crypto_options,
std::vector<std::string>* crypto_suite_names);
} // namespace cricket
#endif // PC_MEDIA_SESSION_H_