C++ JsepTrack::GetDirection方法代码示例

nsresult
MediaPipelineFactory::GetTransportParameters(
    const JsepTrackPair& aTrackPair,
    const JsepTrack& aTrack,
    size_t* aLevelOut,
    RefPtr<TransportFlow>* aRtpOut,
    RefPtr<TransportFlow>* aRtcpOut,
    nsAutoPtr<MediaPipelineFilter>* aFilterOut)
{
  *aLevelOut = aTrackPair.mLevel;

  size_t transportLevel = aTrackPair.mBundleLevel.isSome() ?
                          *aTrackPair.mBundleLevel :
                          aTrackPair.mLevel;

  nsresult rv = CreateOrGetTransportFlow(
      transportLevel, false, *aTrackPair.mRtpTransport, aRtpOut);
  if (NS_FAILED(rv)) {
    return rv;
  }
  MOZ_ASSERT(aRtpOut);

  if (aTrackPair.mRtcpTransport) {
    rv = CreateOrGetTransportFlow(
        transportLevel, true, *aTrackPair.mRtcpTransport, aRtcpOut);
    if (NS_FAILED(rv)) {
      return rv;
    }
    MOZ_ASSERT(aRtcpOut);
  }

  if (aTrackPair.mBundleLevel.isSome()) {
    bool receiving = aTrack.GetDirection() == sdp::kRecv;

    *aFilterOut = new MediaPipelineFilter;

    if (receiving) {
      // Add remote SSRCs so we can distinguish which RTP packets actually
      // belong to this pipeline (also RTCP sender reports).
      for (auto i = aTrack.GetSsrcs().begin();
          i != aTrack.GetSsrcs().end(); ++i) {
        (*aFilterOut)->AddRemoteSSRC(*i);
      }

      // TODO(bug 1105005): Tell the filter about the mid for this track

      // Add unique payload types as a last-ditch fallback
      auto uniquePts = aTrack.GetNegotiatedDetails()->GetUniquePayloadTypes();
      for (auto i = uniquePts.begin(); i != uniquePts.end(); ++i) {
        (*aFilterOut)->AddUniquePT(*i);
      }
    }
  }

  return NS_OK;
}

    void SanityCheckTracks(const JsepTrack& a, const JsepTrack& b) const
    {
      if (!a.GetNegotiatedDetails()) {
        ASSERT_FALSE(!!b.GetNegotiatedDetails());
        return;
      }

      ASSERT_TRUE(!!a.GetNegotiatedDetails());
      ASSERT_TRUE(!!b.GetNegotiatedDetails());
      ASSERT_EQ(a.GetMediaType(), b.GetMediaType());
      ASSERT_EQ(a.GetStreamId(), b.GetStreamId());
      ASSERT_EQ(a.GetTrackId(), b.GetTrackId());
      ASSERT_EQ(a.GetCNAME(), b.GetCNAME());
      ASSERT_NE(a.GetDirection(), b.GetDirection());
      ASSERT_EQ(a.GetSsrcs().size(), b.GetSsrcs().size());
      for (size_t i = 0; i < a.GetSsrcs().size(); ++i) {
        ASSERT_EQ(a.GetSsrcs()[i], b.GetSsrcs()[i]);
      }

      SanityCheckNegotiatedDetails(*a.GetNegotiatedDetails(),
                                   *b.GetNegotiatedDetails());
    }

nsresult
MediaPipelineFactory::GetOrCreateVideoConduit(
    const JsepTrackPair& aTrackPair,
    const JsepTrack& aTrack,
    RefPtr<MediaSessionConduit>* aConduitp)
{

  if (!aTrack.GetNegotiatedDetails()) {
    MOZ_ASSERT(false, "Track is missing negotiated details");
    return NS_ERROR_INVALID_ARG;
  }

  bool receiving = aTrack.GetDirection() == sdp::kRecv;

  RefPtr<VideoSessionConduit> conduit =
    mPCMedia->GetVideoConduit(aTrackPair.mLevel);

  if (!conduit) {
    conduit = VideoSessionConduit::Create();
    if (!conduit) {
      MOZ_MTLOG(ML_ERROR, "Could not create video conduit");
      return NS_ERROR_FAILURE;
    }

    mPCMedia->AddVideoConduit(aTrackPair.mLevel, conduit);
  }

  if (!GetBestCodec(*aTrack.GetNegotiatedDetails())) {
    MOZ_MTLOG(ML_ERROR, "Can't set up a conduit with 0 codecs");
    return NS_ERROR_FAILURE;
  }

  size_t numCodecs = aTrack.GetNegotiatedDetails()->GetCodecCount();

  bool configuredH264 = false;
  if (receiving) {
    PtrVector<VideoCodecConfig> configs;

    for (size_t i = 0; i < numCodecs; i++) {
      const JsepCodecDescription* cdesc =
        aTrack.GetNegotiatedDetails()->GetCodec(i);

      // We can only handle configuring one recv H264 codec
      if (configuredH264 && (cdesc->mName == "H264")) {
        continue;
      }

      VideoCodecConfig* configRaw;
      nsresult rv = JsepCodecDescToCodecConfig(*cdesc, &configRaw);
      if (NS_FAILED(rv))
        return rv;

      UniquePtr<VideoCodecConfig> config(configRaw);
      if (EnsureExternalCodec(*conduit, config.get(), false)) {
        continue;
      }

      if (cdesc->mName == "H264") {
        configuredH264 = true;
      }
      configs.values.push_back(config.release());
    }

    auto error = conduit->ConfigureRecvMediaCodecs(configs.values);

    if (error) {
      MOZ_MTLOG(ML_ERROR, "ConfigureRecvMediaCodecs failed: " << error);
      return NS_ERROR_FAILURE;
    }

    if (!aTrackPair.mSending) {
      // No send track, but we still need to configure an SSRC for receiver
      // reports.
      if (!conduit->SetLocalSSRC(aTrackPair.mRecvonlySsrc)) {
        MOZ_MTLOG(ML_ERROR, "SetLocalSSRC failed");
        return NS_ERROR_FAILURE;
      }
    }
  } else {
    // For now we only expect to have one ssrc per local track.
    auto ssrcs = aTrack.GetSsrcs();
    if (!ssrcs.empty()) {
      if (!conduit->SetLocalSSRC(ssrcs.front())) {
        MOZ_MTLOG(ML_ERROR, "SetLocalSSRC failed");
        return NS_ERROR_FAILURE;
      }
    }

    conduit->SetLocalCNAME(aTrack.GetCNAME().c_str());

    const JsepCodecDescription* cdesc =
      GetBestCodec(*aTrack.GetNegotiatedDetails());

    VideoCodecConfig* configRaw;
    nsresult rv = JsepCodecDescToCodecConfig(*cdesc, &configRaw);
    if (NS_FAILED(rv))
      return rv;

    rv = ConfigureVideoCodecMode(aTrack,*conduit);
    if (NS_FAILED(rv)) {
//.........这里部分代码省略.........

nsresult
MediaPipelineFactory::CreateOrUpdateMediaPipeline(
    const JsepTrackPair& aTrackPair,
    const JsepTrack& aTrack)
{
#if !defined(MOZILLA_EXTERNAL_LINKAGE)
  // The GMP code is all the way on the other side of webrtc.org, and it is not
  // feasible to plumb this information all the way through. So, we set it (for
  // the duration of this call) in a global variable. This allows the GMP code
  // to report errors to the PC.
  WebrtcGmpPCHandleSetter setter(mPC->GetHandle());
#endif

  MOZ_ASSERT(aTrackPair.mRtpTransport);

  bool receiving = aTrack.GetDirection() == sdp::kRecv;

  size_t level;
  RefPtr<TransportFlow> rtpFlow;
  RefPtr<TransportFlow> rtcpFlow;
  nsAutoPtr<MediaPipelineFilter> filter;

  nsresult rv = GetTransportParameters(aTrackPair,
                                       aTrack,
                                       &level,
                                       &rtpFlow,
                                       &rtcpFlow,
                                       &filter);
  if (NS_FAILED(rv)) {
    MOZ_MTLOG(ML_ERROR, "Failed to get transport parameters for pipeline, rv="
              << static_cast<unsigned>(rv));
    return rv;
  }

  if (aTrack.GetMediaType() == SdpMediaSection::kApplication) {
    // GetTransportParameters has already done everything we need for
    // datachannel.
    return NS_OK;
  }

  // Find the stream we need
  SourceStreamInfo* stream;
  if (receiving) {
    stream = mPCMedia->GetRemoteStreamById(aTrack.GetStreamId());
  } else {
    stream = mPCMedia->GetLocalStreamById(aTrack.GetStreamId());
  }

  if (!stream) {
    MOZ_MTLOG(ML_ERROR, "Negotiated " << (receiving ? "recv" : "send")
              << " stream id " << aTrack.GetStreamId() << " was never added");
    MOZ_ASSERT(false);
    return NS_ERROR_FAILURE;
  }

  if (!stream->HasTrack(aTrack.GetTrackId())) {
    MOZ_MTLOG(ML_ERROR, "Negotiated " << (receiving ? "recv" : "send")
              << " track id " << aTrack.GetTrackId() << " was never added");
    MOZ_ASSERT(false);
    return NS_ERROR_FAILURE;
  }

  RefPtr<MediaSessionConduit> conduit;
  if (aTrack.GetMediaType() == SdpMediaSection::kAudio) {
    rv = GetOrCreateAudioConduit(aTrackPair, aTrack, &conduit);
    if (NS_FAILED(rv))
      return rv;
  } else if (aTrack.GetMediaType() == SdpMediaSection::kVideo) {
    rv = GetOrCreateVideoConduit(aTrackPair, aTrack, &conduit);
    if (NS_FAILED(rv))
      return rv;
  } else {
    // We've created the TransportFlow, nothing else to do here.
    return NS_OK;
  }

  RefPtr<MediaPipeline> pipeline =
    stream->GetPipelineByTrackId_m(aTrack.GetTrackId());

  if (pipeline && pipeline->level() != static_cast<int>(level)) {
    MOZ_MTLOG(ML_WARNING, "Track " << aTrack.GetTrackId() <<
                          " has moved from level " << pipeline->level() <<
                          " to level " << level <<
                          ". This requires re-creating the MediaPipeline.");
    // Since we do not support changing the conduit on a pre-existing
    // MediaPipeline
    pipeline = nullptr;
    stream->RemoveTrack(aTrack.GetTrackId());
    stream->AddTrack(aTrack.GetTrackId());
  }

  if (pipeline) {
    pipeline->UpdateTransport_m(level, rtpFlow, rtcpFlow, filter);
    return NS_OK;
  }

  MOZ_MTLOG(ML_DEBUG,
            "Creating media pipeline"
                << " m-line index=" << aTrackPair.mLevel
                << " type=" << aTrack.GetMediaType()
//.........这里部分代码省略.........

nsresult
MediaPipelineFactory::CreateOrUpdateMediaPipeline(
    const JsepTrackPair& aTrackPair,
    const JsepTrack& aTrack)
{
  MOZ_ASSERT(aTrackPair.mRtpTransport);

  bool receiving =
      aTrack.GetDirection() == JsepTrack::Direction::kJsepTrackReceiving;

  size_t level;
  RefPtr<TransportFlow> rtpFlow;
  RefPtr<TransportFlow> rtcpFlow;
  nsAutoPtr<MediaPipelineFilter> filter;

  nsresult rv = GetTransportParameters(aTrackPair,
                                       aTrack,
                                       &level,
                                       &rtpFlow,
                                       &rtcpFlow,
                                       &filter);
  if (NS_FAILED(rv)) {
    MOZ_MTLOG(ML_ERROR, "Failed to get transport parameters for pipeline, rv="
              << static_cast<unsigned>(rv));
    return rv;
  }

  if (aTrack.GetMediaType() == SdpMediaSection::kApplication) {
    // GetTransportParameters has already done everything we need for
    // datachannel.
    return NS_OK;
  }

  // Find the stream we need
  SourceStreamInfo* stream;
  if (receiving) {
    stream = mPCMedia->GetRemoteStreamById(aTrack.GetStreamId());
  } else {
    stream = mPCMedia->GetLocalStreamById(aTrack.GetStreamId());
  }

  if (!stream) {
    MOZ_MTLOG(ML_ERROR, "Negotiated " << (receiving ? "recv" : "send")
              << " stream id " << aTrack.GetStreamId() << " was never added");
    MOZ_ASSERT(false);
    return NS_ERROR_FAILURE;
  }

  if (!stream->HasTrack(aTrack.GetTrackId())) {
    MOZ_MTLOG(ML_ERROR, "Negotiated " << (receiving ? "recv" : "send")
              << " track id " << aTrack.GetTrackId() << " was never added");
    MOZ_ASSERT(false);
    return NS_ERROR_FAILURE;
  }

  RefPtr<MediaSessionConduit> conduit;
  if (aTrack.GetMediaType() == SdpMediaSection::kAudio) {
    rv = GetOrCreateAudioConduit(aTrackPair, aTrack, &conduit);
    if (NS_FAILED(rv))
      return rv;
  } else if (aTrack.GetMediaType() == SdpMediaSection::kVideo) {
    rv = GetOrCreateVideoConduit(aTrackPair, aTrack, &conduit);
    if (NS_FAILED(rv))
      return rv;
  } else {
    // We've created the TransportFlow, nothing else to do here.
    return NS_OK;
  }

  RefPtr<MediaPipeline> pipeline =
    stream->GetPipelineByTrackId_m(aTrack.GetTrackId());

  if (pipeline && pipeline->level() != static_cast<int>(level)) {
    MOZ_MTLOG(ML_WARNING, "Track " << aTrack.GetTrackId() <<
                          " has moved from level " << pipeline->level() <<
                          " to level " << level <<
                          ". This requires re-creating the MediaPipeline.");
    // Since we do not support changing the conduit on a pre-existing
    // MediaPipeline
    pipeline = nullptr;
    stream->RemoveTrack(aTrack.GetTrackId());
    stream->AddTrack(aTrack.GetTrackId());
  }

  if (pipeline) {
    pipeline->UpdateTransport_m(level, rtpFlow, rtcpFlow, filter);
    return NS_OK;
  }

  MOZ_MTLOG(ML_DEBUG,
            "Creating media pipeline"
                << " m-line index=" << aTrackPair.mLevel
                << " type=" << aTrack.GetMediaType()
                << " direction=" << aTrack.GetDirection());

  if (receiving) {
    rv = CreateMediaPipelineReceiving(aTrackPair, aTrack,
                                      level, rtpFlow, rtcpFlow, filter,
                                      conduit);
    if (NS_FAILED(rv))
//.........这里部分代码省略.........

nsresult
MediaPipelineFactory::GetOrCreateVideoConduit(
    const JsepTrackPair& aTrackPair,
    const JsepTrack& aTrack,
    RefPtr<MediaSessionConduit>* aConduitp)
{

  if (!aTrack.GetNegotiatedDetails()) {
    MOZ_ASSERT(false, "Track is missing negotiated details");
    return NS_ERROR_INVALID_ARG;
  }

  bool receiving = aTrack.GetDirection() == sdp::kRecv;

  RefPtr<VideoSessionConduit> conduit =
    mPCMedia->GetVideoConduit(aTrackPair.mLevel);

  if (!conduit) {
    conduit = VideoSessionConduit::Create();
    if (!conduit) {
      MOZ_MTLOG(ML_ERROR, "Could not create video conduit");
      return NS_ERROR_FAILURE;
    }

    mPCMedia->AddVideoConduit(aTrackPair.mLevel, conduit);
  }

  PtrVector<VideoCodecConfig> configs;
  nsresult rv = NegotiatedDetailsToVideoCodecConfigs(
      *aTrack.GetNegotiatedDetails(), &configs);

  if (NS_FAILED(rv)) {
    MOZ_MTLOG(ML_ERROR, "Failed to convert JsepCodecDescriptions to "
                        "VideoCodecConfigs.");
    return rv;
  }

  if (configs.values.empty()) {
    MOZ_MTLOG(ML_ERROR, "Can't set up a conduit with 0 codecs");
    return NS_ERROR_FAILURE;
  }

  if (receiving) {
    // Prune out stuff we cannot actually do. We should work to eliminate the
    // need for this.
    bool configuredH264 = false;
    for (size_t i = 0; i < configs.values.size();) {
      // TODO(bug 1200768): We can only handle configuring one recv H264 codec
      if (configuredH264 && (configs.values[i]->mName == "H264")) {
        delete configs.values[i];
        configs.values.erase(configs.values.begin() + i);
        continue;
      }

      // TODO(bug 1018791): This really should be checked sooner
      if (EnsureExternalCodec(*conduit, configs.values[i], false)) {
        delete configs.values[i];
        configs.values.erase(configs.values.begin() + i);
        continue;
      }

      if (configs.values[i]->mName == "H264") {
        configuredH264 = true;
      }
      ++i;
    }

    auto error = conduit->ConfigureRecvMediaCodecs(configs.values);

    if (error) {
      MOZ_MTLOG(ML_ERROR, "ConfigureRecvMediaCodecs failed: " << error);
      return NS_ERROR_FAILURE;
    }

    if (!aTrackPair.mSending) {
      // No send track, but we still need to configure an SSRC for receiver
      // reports.
      if (!conduit->SetLocalSSRC(aTrackPair.mRecvonlySsrc)) {
        MOZ_MTLOG(ML_ERROR, "SetLocalSSRC failed");
        return NS_ERROR_FAILURE;
      }
    }
  } else {
    // For now we only expect to have one ssrc per local track.
    auto ssrcs = aTrack.GetSsrcs();
    if (!ssrcs.empty()) {
      if (!conduit->SetLocalSSRC(ssrcs.front())) {
        MOZ_MTLOG(ML_ERROR, "SetLocalSSRC failed");
        return NS_ERROR_FAILURE;
      }
    }

    conduit->SetLocalCNAME(aTrack.GetCNAME().c_str());

    rv = ConfigureVideoCodecMode(aTrack,*conduit);
    if (NS_FAILED(rv)) {
      return rv;
    }

    // TODO(bug 1018791): This really should be checked sooner
//.........这里部分代码省略.........