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<title>RTCPeerConnection.prototype.addTransceiver</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
  'use strict';

  // Test is based on the following editor draft:
  // https://rawgit.com/w3c/webrtc-pc/cc8d80f455b86c8041d63bceb8b457f45c72aa89/webrtc.html

  /*
    5.1.  RTCPeerConnection Interface Extensions

      partial interface RTCPeerConnection {
          sequence<RTCRtpSender>      getSenders();
          sequence<RTCRtpReceiver>    getReceivers();
          sequence<RTCRtpTransceiver> getTransceivers();
          RTCRtpTransceiver           addTransceiver((MediaStreamTrack or DOMString) trackOrKind,
                                                     optional RTCRtpTransceiverInit init);
          ...
      };

      dictionary RTCRtpTransceiverInit {
          RTCRtpTransceiverDirection         direction = "sendrecv";
          sequence<MediaStream>              streams;
          sequence<RTCRtpEncodingParameters> sendEncodings;
      };

      enum RTCRtpTransceiverDirection {
        "sendrecv",
        "sendonly",
        "recvonly",
        "inactive"
      };

    5.2.  RTCRtpSender Interface

      interface RTCRtpSender {
        readonly attribute MediaStreamTrack? track;
        ...
      };

    5.3.  RTCRtpReceiver Interface

      interface RTCRtpReceiver {
        readonly attribute MediaStreamTrack  track;
        ...
      };

    5.4.  RTCRtpTransceiver Interface

      interface RTCRtpTransceiver {
        readonly attribute DOMString?                  mid;
        [SameObject]
        readonly attribute RTCRtpSender                sender;
        [SameObject]
        readonly attribute RTCRtpReceiver              receiver;
        readonly attribute boolean                     stopped;
        readonly attribute RTCRtpTransceiverDirection  direction;
        readonly attribute RTCRtpTransceiverDirection? currentDirection;
        ...
      };

      Note
        While addTrack checks if the MediaStreamTrack given as an argument is
        already being sent to avoid sending the same MediaStreamTrack twice,
        the other ways do not, allowing the same MediaStreamTrack to be sent
        several times simultaneously.
   */

  /*
    5.1.  addTransceiver
      3.  If the first argument is a string, let it be kind and run the following steps:
        1.  If kind is not a legal MediaStreamTrack kind, throw a TypeError.
   */
  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    assert_idl_attribute(pc, 'addTransceiver');
    assert_throws_js(TypeError, () => pc.addTransceiver('invalid'));
  }, 'addTransceiver() with string argument as invalid kind should throw TypeError');

  /*
    5.1.  addTransceiver
      The initial value of mid is null.

      3.  If the dictionary argument is present, let direction be the value of the
          direction member. Otherwise let direction be sendrecv.
      4.  If the first argument is a string, let it be kind and run the following steps:
        2.  Let track be null.
      8.  Create an RTCRtpSender with track, streams and sendEncodings and let
          sender be the result.
      9.  Create an RTCRtpReceiver with kind and let receiver be the result.
      10. Create an RTCRtpTransceiver with sender, receiver and direction, and let
          transceiver be the result.
      11. Add transceiver to connection's set of transceivers.

    5.2.  RTCRtpSender Interface
      Create an RTCRtpSender
        2.  Set sender.track to track.

    5.3.  RTCRtpReceiver Interface
      Create an RTCRtpReceiver
        2.  Let track be a new MediaStreamTrack object [GETUSERMEDIA]. The source of
            track is a remote source provided by receiver.
        3.  Initialize track.kind to kind.
        5.  Initialize track.label to the result of concatenating the string "remote "
            with kind.
        6.  Initialize track.readyState to live.
        7.  Initialize track.muted to true.
        8.  Set receiver.track to track.

    5.4.  RTCRtpTransceiver Interface
      Create an RTCRtpTransceiver
        2.  Set transceiver.sender to sender.
        3.  Set transceiver.receiver to receiver.
        4.  Let transceiver have a [[Direction]] internal slot, initialized to direction.
        5.  Let transceiver have a [[CurrentDirection]] internal slot, initialized
            to null.
        6.  Set transceiver.stopped to false.
   */
  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    assert_idl_attribute(pc, 'addTransceiver');

    const transceiver = pc.addTransceiver('audio');
    assert_true(transceiver instanceof RTCRtpTransceiver,
      'Expect transceiver to be instance of RTCRtpTransceiver');

    assert_equals(transceiver.mid, null);
    assert_equals(transceiver.stopped, false);
    assert_equals(transceiver.direction, 'sendrecv');
    assert_equals(transceiver.currentDirection, null);

    assert_array_equals([transceiver], pc.getTransceivers(),
      `Expect added transceiver to be the only element in connection's list of transceivers`);

    const sender = transceiver.sender;

    assert_true(sender instanceof RTCRtpSender,
      'Expect sender to be instance of RTCRtpSender');

    assert_equals(sender.track, null);

    assert_array_equals([sender], pc.getSenders(),
      `Expect added sender to be the only element in connection's list of senders`);

    const receiver = transceiver.receiver;
    assert_true(receiver instanceof RTCRtpReceiver,
      'Expect receiver to be instance of RTCRtpReceiver');

    const track = receiver.track;
    assert_true(track instanceof MediaStreamTrack,
      'Expect receiver.track to be instance of MediaStreamTrack');

    assert_equals(track.kind, 'audio');
    assert_equals(track.readyState, 'live');
    assert_equals(track.muted, true);

    assert_array_equals([receiver], pc.getReceivers(),
      `Expect added receiver to be the only element in connection's list of receivers`);

  }, `addTransceiver('audio') should return an audio transceiver`);

  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    assert_idl_attribute(pc, 'addTransceiver');

    const transceiver = pc.addTransceiver('video');
    assert_true(transceiver instanceof RTCRtpTransceiver,
      'Expect transceiver to be instance of RTCRtpTransceiver');

    assert_equals(transceiver.mid, null);
    assert_equals(transceiver.stopped, false);
    assert_equals(transceiver.direction, 'sendrecv');

    assert_array_equals([transceiver], pc.getTransceivers(),
      `Expect added transceiver to be the only element in connection's list of transceivers`);

    const sender = transceiver.sender;

    assert_true(sender instanceof RTCRtpSender,
      'Expect sender to be instance of RTCRtpSender');

    assert_equals(sender.track, null);

    assert_array_equals([sender], pc.getSenders(),
      `Expect added sender to be the only element in connection's list of senders`);

    const receiver = transceiver.receiver;
    assert_true(receiver instanceof RTCRtpReceiver,
      'Expect receiver to be instance of RTCRtpReceiver');

    const track = receiver.track;
    assert_true(track instanceof MediaStreamTrack,
      'Expect receiver.track to be instance of MediaStreamTrack');

    assert_equals(track.kind, 'video');
    assert_equals(track.readyState, 'live');
    assert_equals(track.muted, true);

    assert_array_equals([receiver], pc.getReceivers(),
      `Expect added receiver to be the only element in connection's list of receivers`);

  }, `addTransceiver('video') should return a video transceiver`);

  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    const transceiver = pc.addTransceiver('audio', { direction: 'sendonly' });
    assert_equals(transceiver.direction, 'sendonly');
  }, `addTransceiver() with direction sendonly should have result transceiver.direction be the same`);

  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    const transceiver = pc.addTransceiver('audio', { direction: 'inactive' });
    assert_equals(transceiver.direction, 'inactive');
  }, `addTransceiver() with direction inactive should have result transceiver.direction be the same`);

  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    assert_idl_attribute(pc, 'addTransceiver');
    assert_throws_js(TypeError, () =>
      pc.addTransceiver('audio', { direction: 'invalid' }));
  }, `addTransceiver() with invalid direction should throw TypeError`);

  /*
    5.1.  addTransceiver
      5.  If the first argument is a MediaStreamTrack , let it be track and let
          kind be track.kind.
   */
  promise_test(async t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    const stream = await getNoiseStream({audio: true});
    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
    const [track] = stream.getTracks();
    const transceiver = pc.addTransceiver(track);
    const { sender, receiver } = transceiver;

    assert_true(sender instanceof RTCRtpSender,
      'Expect sender to be instance of RTCRtpSender');

    assert_true(receiver instanceof RTCRtpReceiver,
      'Expect receiver to be instance of RTCRtpReceiver');

    assert_equals(sender.track, track,
      'Expect sender.track should be the track that is added');

    const receiverTrack = receiver.track;
    assert_true(receiverTrack instanceof MediaStreamTrack,
      'Expect receiver.track to be instance of MediaStreamTrack');

    assert_equals(receiverTrack.kind, 'audio',
      `receiver.track should have the same kind as added track's kind`);

    assert_equals(receiverTrack.readyState, 'live');
    assert_equals(receiverTrack.muted, true);

    assert_array_equals([transceiver], pc.getTransceivers(),
      `Expect added transceiver to be the only element in connection's list of transceivers`);

    assert_array_equals([sender], pc.getSenders(),
      `Expect added sender to be the only element in connection's list of senders`);

    assert_array_equals([receiver], pc.getReceivers(),
      `Expect added receiver to be the only element in connection's list of receivers`);

  }, 'addTransceiver(track) should have result with sender.track be given track');

  promise_test(async t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    const stream = await getNoiseStream({audio: true});
    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
    const [track] = stream.getTracks();
    const transceiver1 = pc.addTransceiver(track);
    const transceiver2 = pc.addTransceiver(track);

    assert_not_equals(transceiver1, transceiver2);

    const sender1 = transceiver1.sender;
    const sender2 = transceiver2.sender;

    assert_not_equals(sender1, sender2);
    assert_equals(transceiver1.sender.track, track);
    assert_equals(transceiver2.sender.track, track);

    const transceivers = pc.getTransceivers();
    assert_equals(transceivers.length, 2);
    assert_true(transceivers.includes(transceiver1));
    assert_true(transceivers.includes(transceiver2));

    const senders = pc.getSenders();
    assert_equals(senders.length, 2);
    assert_true(senders.includes(sender1));
    assert_true(senders.includes(sender2));

  }, 'addTransceiver(track) multiple times should create multiple transceivers');

  /*
    5.1.  addTransceiver
      6.  Verify that each rid value in sendEncodings is composed only of
          case-sensitive alphanumeric characters (a-z, A-Z, 0-9) up to a maximum
          of 16 characters. If one of the RIDs does not meet these requirements,
          throw a TypeError.
   */
  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    assert_idl_attribute(pc, 'addTransceiver');

    assert_throws_js(TypeError, () =>
      pc.addTransceiver('audio', {
        sendEncodings: [{
          rid: '@Invalid!'
        }]
      }));
  }, 'addTransceiver() with rid containing invalid non-alphanumeric characters should throw TypeError');

  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    assert_idl_attribute(pc, 'addTransceiver');

    assert_throws_js(TypeError, () =>
      pc.addTransceiver('audio', {
        sendEncodings: [{
          rid: 'a'.repeat(17)
        }]
      }));
  }, 'addTransceiver() with rid longer than 16 characters should throw TypeError');

  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    pc.addTransceiver('audio', {
      sendEncodings: [{
        rid: 'foo'
      }]
    });
  }, `addTransceiver() with valid rid value should succeed`);

  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    pc.addTransceiver('audio', {
      sendEncodings: [{
        dtx: 'enabled',
        active: false,
        ptime: 5,
        maxBitrate: 8,
        maxFramerate: 25,
        rid: 'foo'
      }]
    });
  }, `addTransceiver() with valid sendEncodings should succeed`);

  /*
    TODO
      5.1.  addTransceiver
        - Adding a transceiver will cause future calls to createOffer to add a media
          description for the corresponding transceiver, as defined in [JSEP]
          (section 5.2.2.).

        - Setting a new RTCSessionDescription may change mid to a non-null value,
          as defined in [JSEP] (section 5.5. and section 5.6.).

        1.  If the dictionary argument is present, and it has a streams member, let
            streams be that list of MediaStream objects.

      5.2.  RTCRtpSender Interface
        Create an RTCRtpSender
          3.  Let sender have an [[associated MediaStreams]] internal slot, representing
              a list of MediaStream objects that the MediaStreamTrack object of this
              sender is associated with.

          4.  Set sender's [[associated MediaStreams]] slot to streams.

          5.  Let sender have a [[send encodings]] internal slot, representing a list
              of RTCRtpEncodingParameters dictionaries.

          6.  If sendEncodings is given as input to this algorithm, and is non-empty,
              set the [[send encodings]] slot to sendEncodings. Otherwise, set it to a
              list containing a single RTCRtpEncodingParameters with active set to true.

      5.3.  RTCRtpReceiver Interface
        Create an RTCRtpReceiver
          4.  If an id string, id, was given as input to this algorithm, initialize
              track.id to id. (Otherwise the value generated when track was created
              will be used.)

    Tested in RTCPeerConnection-onnegotiationneeded.html
      5.1.  addTransceiver
        12. Update the negotiation-needed flag for connection.

    Out of Scope
      5.1.  addTransceiver
        8.  If sendEncodings is set, then subsequent calls to createOffer will be
            configured to send multiple RTP encodings as defined in [JSEP]
            (section 5.2.2. and section 5.2.1.).

            When setRemoteDescription is called with a corresponding remote
            description that is able to receive multiple RTP encodings as defined
            in [JSEP] (section 3.7.), the RTCRtpSender may send multiple RTP
            encodings and the parameters retrieved via the transceiver's
            sender.getParameters() will reflect the encodings negotiated.

        9.  This specification does not define how to configure createOffer to
            receive multiple RTP encodings. However when setRemoteDescription is
            called with a corresponding remote description that is able to send
            multiple RTP encodings as defined in [JSEP], the RTCRtpReceiver may
            receive multiple RTP encodings and the parameters retrieved via the
            transceiver's receiver.getParameters() will reflect the encodings
            negotiated.

    Coverage Report
                            Tested    Not-Tested  Non-Testable  Total
      addTransceiver          14          1           3           18
      Create Sender            3          4           0            7
      Create Receiver          8          1           0            9
      Create Transceiver       7          0           0            7

      Total                   32          6           3           41
   */
</script>