sdp_changer.h - mozsearch

/*

 *  Copyright (c) 2019 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 TEST_PC_E2E_SDP_SDP_CHANGER_H_

#define TEST_PC_E2E_SDP_SDP_CHANGER_H_

#include <map>

#include <optional>

#include <string>

#include <vector>

#include "absl/strings/string_view.h"

#include "api/array_view.h"

#include "api/jsep.h"

#include "api/rtp_parameters.h"

#include "api/test/pclf/media_configuration.h"

#include "media/base/rid_description.h"

#include "pc/session_description.h"

#include "pc/simulcast_description.h"

namespace webrtc {

namespace webrtc_pc_e2e {

// Creates list of capabilities, which can be set on RtpTransceiverInterface via

// RtpTransceiverInterface::SetCodecPreferences(...) to negotiate use of codecs

// from list of `supported_codecs` which will match `video_codecs`. If flags

// `ulpfec` or `flexfec` set to true corresponding FEC codec will be added.

// FEC and RTX codecs will be added after required codecs.

//

// All codecs will be added only if they exists in the list of

// `supported_codecs`. If multiple codecs from this list will match

// `video_codecs`, then all of them will be added to the output

// vector and they will be added in the same order, as they were in

// `supported_codecs`.

std::vector<RtpCodecCapability> FilterVideoCodecCapabilities(

    rtc::ArrayView<const VideoCodecConfig> video_codecs,

    bool use_rtx,

    bool use_ulpfec,

    bool use_flexfec,

    rtc::ArrayView<const RtpCodecCapability> supported_codecs);

struct LocalAndRemoteSdp {

  LocalAndRemoteSdp(std::unique_ptr<SessionDescriptionInterface> local_sdp,

                    std::unique_ptr<SessionDescriptionInterface> remote_sdp)

      : local_sdp(std::move(local_sdp)), remote_sdp(std::move(remote_sdp)) {}

  // Sdp, that should be as local description on the peer, that created it.

  std::unique_ptr<SessionDescriptionInterface> local_sdp;

  // Sdp, that should be set as remote description on the peer opposite to the

  // one, who created it.

  std::unique_ptr<SessionDescriptionInterface> remote_sdp;

};

struct PatchingParams {

  PatchingParams(

      bool use_conference_mode,

      std::map<std::string, int> stream_label_to_simulcast_streams_count)

      : use_conference_mode(use_conference_mode),

        stream_label_to_simulcast_streams_count(

            stream_label_to_simulcast_streams_count) {}

  bool use_conference_mode;

  std::map<std::string, int> stream_label_to_simulcast_streams_count;

};

class SignalingInterceptor {

 public:

  explicit SignalingInterceptor(PatchingParams params) : params_(params) {}

  LocalAndRemoteSdp PatchOffer(

      std::unique_ptr<SessionDescriptionInterface> offer,

      const VideoCodecConfig& first_codec);

  LocalAndRemoteSdp PatchAnswer(

      std::unique_ptr<SessionDescriptionInterface> answer,

      const VideoCodecConfig& first_codec);

  std::vector<std::unique_ptr<IceCandidateInterface>> PatchOffererIceCandidates(

      rtc::ArrayView<const IceCandidateInterface* const> candidates);

  std::vector<std::unique_ptr<IceCandidateInterface>>

  PatchAnswererIceCandidates(

      rtc::ArrayView<const IceCandidateInterface* const> candidates);

 private:

  // Contains information about simulcast section, that is required to perform

  // modified offer/answer and ice candidates exchange.

  struct SimulcastSectionInfo {

    SimulcastSectionInfo(const std::string& mid,

                         cricket::MediaProtocolType media_protocol_type,

                         const std::vector<cricket::RidDescription>& rids_desc);

    const std::string mid;

    const cricket::MediaProtocolType media_protocol_type;

    std::vector<std::string> rids;

    cricket::SimulcastDescription simulcast_description;

    webrtc::RtpExtension mid_extension;

    webrtc::RtpExtension rid_extension;

    webrtc::RtpExtension rrid_extension;

    cricket::TransportDescription transport_description;

};

  struct SignalingContext {

    SignalingContext() = default;

    // SignalingContext is not copyable and movable.

    SignalingContext(SignalingContext&) = delete;

    SignalingContext& operator=(SignalingContext&) = delete;

    SignalingContext(SignalingContext&&) = delete;

    SignalingContext& operator=(SignalingContext&&) = delete;

    void AddSimulcastInfo(const SimulcastSectionInfo& info);

    bool HasSimulcast() const { return !simulcast_infos.empty(); }

    std::vector<SimulcastSectionInfo> simulcast_infos;

    std::map<std::string, SimulcastSectionInfo*> simulcast_infos_by_mid;

    std::map<std::string, SimulcastSectionInfo*> simulcast_infos_by_rid;

    std::vector<std::string> mids_order;

};

  LocalAndRemoteSdp PatchVp8Offer(

      std::unique_ptr<SessionDescriptionInterface> offer);

  LocalAndRemoteSdp PatchVp9Offer(

      std::unique_ptr<SessionDescriptionInterface> offer);

  LocalAndRemoteSdp PatchVp8Answer(

      std::unique_ptr<SessionDescriptionInterface> answer);

  LocalAndRemoteSdp PatchVp9Answer(

      std::unique_ptr<SessionDescriptionInterface> answer);

  void FillSimulcastContext(SessionDescriptionInterface* offer);

  std::unique_ptr<cricket::SessionDescription> RestoreMediaSectionsOrder(

      std::unique_ptr<cricket::SessionDescription> source);

  PatchingParams params_;

  SignalingContext context_;

};

}  // namespace webrtc_pc_e2e

}  // namespace webrtc

#endif  // TEST_PC_E2E_SDP_SDP_CHANGER_H_