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<title>RTCRtpTransceiver.prototype.setCodecPreferences</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  'use strict';

  // Test is based on the following editor draft:
  // https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html

  /*
    5.4.  RTCRtpTransceiver Interface
      interface RTCRtpTransceiver {
        ...
        void setCodecPreferences(sequence<RTCRtpCodecCapability> codecs);
      };

      setCodecPreferences
        - Setting codecs to an empty sequence resets codec preferences to any
          default value.

        - The codecs sequence passed into setCodecPreferences can only contain
          codecs that are returned by RTCRtpSender.getCapabilities(kind) or
          RTCRtpReceiver.getCapabilities(kind), where kind is the kind of the
          RTCRtpTransceiver on which the method is called. Additionally, the
          RTCRtpCodecParameters dictionary members cannot be modified. If
          codecs does not fulfill these requirements, the user agent MUST throw
          an InvalidAccessError.
   */

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    const capabilities = RTCRtpSender.getCapabilities('audio');
    transceiver.setCodecPreferences(capabilities.codecs);

  }, `setCodecPreferences() on audio transceiver with codecs returned from RTCRtpSender.getCapabilities('audio') should succeed`);

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('video');
    const capabilities = RTCRtpReceiver.getCapabilities('video');
    transceiver.setCodecPreferences(capabilities.codecs);

  }, `setCodecPreferences() on video transceiver with codecs returned from RTCRtpReceiver.getCapabilities('video') should succeed`);

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    const capabilities1 = RTCRtpSender.getCapabilities('audio');
    const capabilities2 = RTCRtpReceiver.getCapabilities('audio');
    transceiver.setCodecPreferences([...capabilities1.codecs, ... capabilities2.codecs]);

  }, `setCodecPreferences() with both sender receiver codecs combined should succeed`);

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    transceiver.setCodecPreferences([]);

  }, `setCodecPreferences([]) should succeed`);

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    const capabilities = RTCRtpSender.getCapabilities('audio');
    const { codecs } = capabilities;

    if(codecs.length >= 2) {
      const tmp = codecs[0];
      codecs[0] = codecs[1];
      codecs[1] = tmp;
    }

    transceiver.setCodecPreferences(codecs);

  }, `setCodecPreferences() with reordered codecs should succeed`);

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    const capabilities = RTCRtpSender.getCapabilities('video');
    assert_throws(() => transceiver.setCodecPreferences(capabilities.codecs));

  }, `setCodecPreferences() on audio transceiver with codecs returned from getCapabilities('video') should throw InvalidAccessError`);

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    const codecs = [{
      mimeType: 'audio/piepiper',
      clockRate: 2000,
      channels: 2,
      sdpFmtpLine: 'a=fmtp:98 0-15'
    }];

    assert_throws(() => transceiver.setCodecPreferences(codecs));

  }, `setCodecPreferences() with user defined codec should throw InvalidAccessError`);

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    const capabilities = RTCRtpSender.getCapabilities('audio');
    const codecs = [
      ...capabilities.codecs,
      {
        mimeType: 'audio/piepiper',
        clockRate: 2000,
        channels: 2,
        sdpFmtpLine: 'a=fmtp:98 0-15'
      }];

    assert_throws(() => transceiver.setCodecPreferences(codecs));

  }, `setCodecPreferences() with user defined codec together with codecs returned from getCapabilities() should throw InvalidAccessError`);

  test(() => {
    const pc = new RTCPeerConnection();
    const transceiver = pc.addTransceiver('audio');
    const capabilities = RTCRtpSender.getCapabilities('audio');

    const { codecs } = capabilities;
    assert_greater_than(codecs.length, 0,
      'Expect at least one codec available');

    const [ codec ] = codecs;
    const { channels=2 } = codec;
    codec.channels = channels+1;

    assert_throws(() => transceiver.setCodecPreferences(codecs));

  }, `setCodecPreferences() with modified codecs returned from getCapabilities() should throw InvalidAccessError`);

 </script>