Cast Streaming API end-to-end browser_test.

chrome/test/data/extensions/api_test/cast_streaming/end_to_end_sender.js

Index: chrome/test/data/extensions/api_test/cast_streaming/end_to_end_sender.js
diff --git a/chrome/test/data/extensions/api_test/cast_streaming/end_to_end_sender.js b/chrome/test/data/extensions/api_test/cast_streaming/end_to_end_sender.js
new file mode 100644
index 0000000000000000000000000000000000000000..aac11dada3522782229502fd6cbd79c19bffb627
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+++ b/chrome/test/data/extensions/api_test/cast_streaming/end_to_end_sender.js
@@ -0,0 +1,143 @@
+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This code uses the tab capture and Cast streaming APIs to capture the content
+// and send it to a Cast receiver end-point controlled by
+// CastStreamingApiTestcode.  It generates audio/video test patterns that rotate
+// cyclicly, and these test patterns are checked for by an in-process Cast
+// receiver to confirm the correct end-to-end functionality of the Cast
+// streaming API.
+//
+// Once everything is set up and fully operational, chrome.test.succeed() is
+// invoked as a signal for the end-to-end testing to proceed.  If any step in
+// the setup process fails, chrome.test.fail() is invoked.
+
+// The test pattern cycles as a color fill of red, then green, then blue; paired
+// with successively higher-frequency tones.
+var colors = [ [ 255, 0, 0 ], [ 0, 255, 0 ], [ 0, 0, 255 ] ];
+var freqs = [ 200, 500, 1800 ];
+var curTestIdx = 0;
+
+function updateTestPattern() {
+  if (document.body && document.body.style)  // Check that page is loaded.
+    document.body.style.backgroundColor = "rgb(" + colors[curTestIdx] + ")";
+
+  // Important: Blink the testing message so that the capture pipeline will
+  // observe drawing updates and continue to produce video frames.
+  var message = document.getElementById("message");
+  if (message && !message.blinkInterval) {
+    message.innerHTML = "Testing...";
+    message.blinkInterval = setInterval(
+        function toggleVisibility() {
+          message.style.visibility =
+              message.style.visibility == "hidden" ? "visible" : "hidden";
+        },
+        125);
+  }
+
+  if (!this.audioContext) {
+    this.audioContext = new webkitAudioContext();
+    this.gainNode = this.audioContext.createGainNode();
+    this.gainNode.gain.value = 0.5;
+    this.gainNode.connect(this.audioContext.destination);
+  } else {
+    this.oscillator.disconnect();
+  }
+  // Note: We recreate the oscillator each time because this switches the audio
+  // frequency immediately.  Re-using the same oscillator tends to take several
+  // hundred milliseconds to ramp-up/down the frequency.
+  this.oscillator = audioContext.createOscillator();
+  this.oscillator.type = "sine";
+  this.oscillator.frequency.value = freqs[curTestIdx];
+  this.oscillator.connect(gainNode);
+  this.oscillator.noteOn(0);
+}
+
+// Calls updateTestPattern(), then waits and calls itself again to advance to
+// the next one.
+function runTestPatternLoop() {
+  updateTestPattern();
+  if (!this.curAdvanceWaitTimeMillis) {
+    this.curAdvanceWaitTimeMillis = 750;
+  }
+  setTimeout(
+      function advanceTestPattern() {
+        ++curTestIdx;
+        if (curTestIdx >= colors.length) {  // Completed a cycle.
+          curTestIdx = 0;
+          // Increase the wait time between switching test patterns for
+          // overloaded bots that aren't capturing all the frames of video.
+          this.curAdvanceWaitTimeMillis *= 1.25;
+        }
+        runTestPatternLoop();
+      },
+      this.curAdvanceWaitTimeMillis);
+}
+
+chrome.test.runTests([
+  function sendTestPatterns() {
+    // The receive port changes between browser_test invocations, and is passed
+    // as an query parameter in the URL.
+    var recvPort;
+    try {
+      recvPort = parseInt(window.location.search.substring("?port=".length));
+      chrome.test.assertTrue(recvPort > 0);
+    } catch (err) {
+      chrome.test.fail("Error parsing ?port=### -- " + err.message);
+      return;
+    }
+
+    // Set to true if you want to confirm the sender color/tone changes are
+    // working, without starting tab capture and Cast sending.
+    if (false) {
+      setTimeout(runTestPatternLoop, 0);
+      return;
+    }
+
+    var width = 128;
+    var height = 128;
+    var frameRate = 15;
+
+    chrome.tabCapture.capture(
+        { video: true,
+          audio: true,
+          videoConstraints: {
+            mandatory: {
+              minWidth: width,
+              minHeight: height,
+              maxWidth: width,
+              maxHeight: height,
+              maxFrameRate: frameRate,
+            }
+          }
+        },
+        function startStreamingTestPatterns(captureStream) {
+          chrome.test.assertTrue(!!captureStream);
+          chrome.cast.streaming.session.create(
+              captureStream.getAudioTracks()[0],
+              captureStream.getVideoTracks()[0],
+              function (audioId, videoId, udpId) {
+                chrome.cast.streaming.udpTransport.setDestination(
+                    udpId, { address: "127.0.0.1", port: recvPort } );
+                var rtpStream = chrome.cast.streaming.rtpStream;
+                rtpStream.start(audioId,
+                                rtpStream.getSupportedParams(audioId)[0]);
+                var videoParams = rtpStream.getSupportedParams(videoId)[0];
+                videoParams.payload.width = width;
+                videoParams.payload.height = height;
+                videoParams.payload.clockRate = frameRate;
+                rtpStream.start(videoId, videoParams);
+                setTimeout(runTestPatternLoop, 0);
+                if (window.innerWidth > 2 * width ||
+                    window.innerHeight > 2 & height) {
+                  console.warn("***TIMEOUT HAZARD***  Tab size is " +
+                      window.innerWidth + "x" + window.innerHeight +
+                      ", which is much larger than the expected " +
+                      width + "x" + height);
+                }
+                chrome.test.succeed();
+              });
+        });
+  }
+]);