webrtc: add wpt test that setCodecPreferences changes the sdp

Adds a test which verifies that setCodecPreferences changes the
order of codecs in the SDP generated by createOffer.

Drive-by: close all peerconnections after the tests,
  https://bugs.chromium.org/p/chromium/issues/detail?id=836871

BUG=None

Change-Id: I75d252bc43919ba2f27c6bd97493f94b3b5a2587
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362024Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/master@{#799168}

third_party/blink/web_tests/external/wpt/webrtc/RTCRtpTransceiver-setCodecPreferences.html

@@ -3,6 +3,7 @@
 <title>RTCRtpTransceiver.prototype.setCodecPreferences</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="./third_party/sdp/sdp.js"></script>
 <script>
   'use strict';
 
@@ -29,40 +30,41 @@
           an InvalidModificationError.
    */
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     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(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     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(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     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(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     transceiver.setCodecPreferences([]);
-
   }, `setCodecPreferences([]) should succeed`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const capabilities = RTCRtpSender.getCapabilities('audio');
     const { codecs } = capabilities;
@@ -74,11 +76,11 @@
     }
 
     transceiver.setCodecPreferences(codecs);
-
   }, `setCodecPreferences() with reordered codecs should succeed`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('video');
     const capabilities = RTCRtpSender.getCapabilities('video');
     const { codecs } = capabilities;
@@ -94,16 +96,17 @@
     assert_true(tried, 'VP8 video codec was found and tried');
   }, `setCodecPreferences() with only one video codec should succeed`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const capabilities = RTCRtpSender.getCapabilities('video');
     assert_throws_dom('InvalidModificationError', () => transceiver.setCodecPreferences(capabilities.codecs));
-
   }, `setCodecPreferences() on audio transceiver with codecs returned from getCapabilities('video') should throw InvalidModificationError`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const codecs = [{
       mimeType: 'data',
@@ -113,11 +116,11 @@
     }];
 
     assert_throws_dom('InvalidModificationError', () => transceiver.setCodecPreferences(codecs));
-
   }, `setCodecPreferences() with user defined codec with invalid mimeType should throw InvalidModificationError`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const codecs = [{
       mimeType: 'audio/piepiper',
@@ -127,11 +130,11 @@
     }];
 
     assert_throws_dom('InvalidModificationError', () => transceiver.setCodecPreferences(codecs));
-
   }, `setCodecPreferences() with user defined codec should throw InvalidModificationError`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const capabilities = RTCRtpSender.getCapabilities('audio');
     const codecs = [
@@ -144,44 +147,44 @@
       }];
 
     assert_throws_dom('InvalidModificationError', () => transceiver.setCodecPreferences(codecs));
-
   }, `setCodecPreferences() with user defined codec together with codecs returned from getCapabilities() should throw InvalidModificationError`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const capabilities = RTCRtpSender.getCapabilities('audio');
     const codecs = [capabilities.codecs[0]];
     codecs[0].clockRate = codecs[0].clockRate / 2;
 
     assert_throws_dom('InvalidModificationError', () => transceiver.setCodecPreferences(codecs));
-
   }, `setCodecPreferences() with modified codec clock rate should throw InvalidModificationError`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const capabilities = RTCRtpSender.getCapabilities('audio');
     const codecs = [capabilities.codecs[0]];
     codecs[0].channels = codecs[0].channels + 11;
 
     assert_throws_dom('InvalidModificationError', () => transceiver.setCodecPreferences(codecs));
-
   }, `setCodecPreferences() with modified codec channel count should throw InvalidModificationError`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const capabilities = RTCRtpSender.getCapabilities('audio');
     const codecs = [capabilities.codecs[0]];
     codecs[0].sdpFmtpLine = "modifiedparameter=1";
 
     assert_throws_dom('InvalidModificationError', () => transceiver.setCodecPreferences(codecs));
-
   }, `setCodecPreferences() with modified codec parameters should throw InvalidModificationError`);
 
-  test(() => {
+  test((t) => {
     const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
     const transceiver = pc.addTransceiver('audio');
     const capabilities = RTCRtpSender.getCapabilities('audio');
 
@@ -194,7 +197,72 @@
     codec.channels = channels+1;
 
     assert_throws_dom('InvalidModificationError', () => transceiver.setCodecPreferences(codecs));
-
   }, `setCodecPreferences() with modified codecs returned from getCapabilities() should throw InvalidModificationError`);
 
+  promise_test(async (t) => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    const transceiver = pc.addTransceiver('audio');
+    const {codecs} = RTCRtpSender.getCapabilities('audio');
+    // Reorder codecs, put PCMU/PCMA first.
+    let firstCodec;
+    let i;
+    for (i = 0; i < codecs.length; i++) {
+      const codec = codecs[i];
+      if (codec.mimeType === 'audio/PCMU' || codec.mimeType === 'audio/PCMA') {
+        codecs.splice(i, 1);
+        codecs.unshift(codec);
+        firstCodec = codec.mimeType.substr(6);
+        break;
+      }
+    }
+    assert_not_equals(firstCodec, undefined, 'PCMU or PCMA codec not found');
+    transceiver.setCodecPreferences(codecs);
+
+    const offer = await pc.createOffer();
+    const mediaSection = SDPUtils.getMediaSections(offer.sdp)[0];
+    const rtpParameters = SDPUtils.parseRtpParameters(mediaSection);
+    assert_equals(rtpParameters.codecs[0].name, firstCodec);
+  }, `setCodecPreferences() modifies the order of audio codecs in createOffer`);
+
+  promise_test(async (t) => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    const transceiver = pc.addTransceiver('video');
+    const {codecs} = RTCRtpSender.getCapabilities('video');
+    // Reorder codecs, swap H264 and VP8.
+    let vp8 = -1;
+    let h264 = -1;
+    let firstCodec;
+    let i;
+    for (i = 0; i < codecs.length; i++) {
+      const codec = codecs[i];
+      if (codec.mimeType === 'video/VP8') {
+        vp8 = i;
+        if (h264 !== -1) {
+          codecs[vp8] = codecs[h264];
+          codecs[h264] = codec;
+          firstCodec = 'VP8';
+          break;
+        }
+      }
+      if (codec.mimeType === 'video/H264') {
+        h264 = i;
+        if (vp8 !== -1) {
+          codecs[h264] = codecs[vp8];
+          codecs[vp8] = codec;
+          firstCodec = 'H264';
+          break;
+        }
+      }
+    }
+    assert_not_equals(firstCodec, undefined, 'VP8 and H264 codecs not found');
+    transceiver.setCodecPreferences(codecs);
+
+    const offer = await pc.createOffer();
+    const mediaSection = SDPUtils.getMediaSections(offer.sdp)[0];
+    const rtpParameters = SDPUtils.parseRtpParameters(mediaSection);
+    assert_equals(rtpParameters.codecs[0].name, firstCodec);
+  }, `setCodecPreferences() modifies the order of video codecs in createOffer`);
+
  </script>

third_party/blink/web_tests/virtual/webrtc-wpt-plan-b/external/wpt/webrtc/RTCRtpTransceiver-setCodecPreferences-expected.txt

@@ -13,5 +13,7 @@ FAIL setCodecPreferences() with modified codec clock rate should throw InvalidMo
 FAIL setCodecPreferences() with modified codec channel count should throw InvalidModificationError Failed to execute 'addTransceiver' on 'RTCPeerConnection': This operation is only supported in 'unified-plan'.
 FAIL setCodecPreferences() with modified codec parameters should throw InvalidModificationError Failed to execute 'addTransceiver' on 'RTCPeerConnection': This operation is only supported in 'unified-plan'.
 FAIL setCodecPreferences() with modified codecs returned from getCapabilities() should throw InvalidModificationError Failed to execute 'addTransceiver' on 'RTCPeerConnection': This operation is only supported in 'unified-plan'.
+FAIL setCodecPreferences() modifies the order of audio codecs in createOffer promise_test: Unhandled rejection with value: object "InvalidStateError: Failed to execute 'addTransceiver' on 'RTCPeerConnection': This operation is only supported in 'unified-plan'."
+FAIL setCodecPreferences() modifies the order of video codecs in createOffer promise_test: Unhandled rejection with value: object "InvalidStateError: Failed to execute 'addTransceiver' on 'RTCPeerConnection': This operation is only supported in 'unified-plan'."
 Harness: the test ran to completion.