commit 188e636ab1f1267f88246f8a5e8c8cc625140263
author Wu-cheng Li <wuchengli@chromium.org> Fri Dec 20 18:43:13 2013 +0800
committer chrome-internal-fetch <chrome-internal-fetch@google.com> Thu Jan 09 08:52:35 2014 +0000
tree d71f17c14a26fedb3ec1934eee1ad230d2e58429
parent 46166101a52c8879a003c7c1f230b2789cf65c47

Use a video as input for video_WebRtcPerf test.

This has two benefits.
- Some cameras do not support 720p.
- Using a file can have more stable performance results.

BUG=chromium:292703
TEST=Run test on snow.

Change-Id: Ib9d34853bad991877076918a73434debbe9ff793
Reviewed-on: https://chromium-review.googlesource.com/180917
Reviewed-by: Wu-Cheng Li <wuchengli@chromium.org>
Tested-by: Wu-Cheng Li <wuchengli@chromium.org>
Commit-Queue: Wu-Cheng Li <wuchengli@chromium.org>

client/site_tests/video_WebRtcPerf/loopback.html

diff --git a/client/site_tests/video_WebRtcPerf/loopback.html b/client/site_tests/video_WebRtcPerf/loopback.html
index 7426c01..68fbd5b 100644
--- a/client/site_tests/video_WebRtcPerf/loopback.html
+++ b/client/site_tests/video_WebRtcPerf/loopback.html
@@ -10,7 +10,17 @@
 function start() {
   navigator.getUserMedia = navigator.getUserMedia ||
     navigator.webkitGetUserMedia;
-  navigator.getUserMedia({audio:false, video:true}, gotLocalStream);
+  navigator.getUserMedia(
+    {
+      audio:false,
+      video:{
+        "mandatory": {
+          "minWidth": "1280",
+          "minHeight": "720",
+        }
+      }
+    },
+    gotLocalStream);
 }
 
 function gotLocalStream(stream) {

client/site_tests/video_WebRtcPerf/video_WebRtcPerf.py

diff --git a/client/site_tests/video_WebRtcPerf/video_WebRtcPerf.py b/client/site_tests/video_WebRtcPerf/video_WebRtcPerf.py
index bb1c692..28efed2 100755
--- a/client/site_tests/video_WebRtcPerf/video_WebRtcPerf.py
+++ b/client/site_tests/video_WebRtcPerf/video_WebRtcPerf.py
@@ -2,17 +2,23 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from contextlib import closing
 import logging
 import os
 import time
+import urllib2
 
 from autotest_lib.client.bin import test, utils
 from autotest_lib.client.common_lib import error
 from autotest_lib.client.common_lib.cros import chrome
 
+
 # Chrome flags to use fake camera and skip camera permission.
 EXTRA_BROWSER_ARGS = ['--use-fake-device-for-media-stream',
                       '--use-fake-ui-for-media-stream']
+FAKE_FILE_ARG = '--use-file-for-fake-video-capture="%s"'
+DOWNLOAD_BASE = 'http://commondatastorage.googleapis.com/chromiumos-test-assets-public/crowd/'
+VIDEO_NAME = 'crowd720_25frames.y4m'
 
 WEBRTC_INTERNALS_URL = 'chrome://webrtc-internals'
 RTC_INIT_HISTOGRAM = 'Media.RTCVideoDecoderInitDecodeSuccess'
@@ -77,11 +83,10 @@
         @raises error.TestError if decoding is not hardware accelerated.
         """
         tab = cr.browser.tabs.New()
-        tab.Navigate(HISTOGRAMS_URL)
-        tab.WaitForDocumentReadyStateToBeComplete()
         def histograms_loaded():
             """Returns true if histogram is loaded."""
             tab.Navigate(HISTOGRAMS_URL)
+            tab.WaitForDocumentReadyStateToBeComplete()
             return tab.EvaluateJavaScript(
                     'document.documentElement.innerText.search("%s") != -1'
                     % RTC_INIT_HISTOGRAM)
@@ -115,7 +120,13 @@
 
 
     def run_once(self):
-        # Start with chrome without asking camera permission.
+        # Download test video.
+        url = DOWNLOAD_BASE + VIDEO_NAME
+        local_path = os.path.join(self.bindir, VIDEO_NAME)
+        self.download_file(url, local_path)
+
+        # Start chrome with test flags.
+        EXTRA_BROWSER_ARGS.append(FAKE_FILE_ARG % local_path)
         with chrome.Chrome(extra_browser_args=EXTRA_BROWSER_ARGS) as cr:
             # Open WebRTC loopback page.
             cr.browser.SetHTTPServerDirectories(self.bindir)
@@ -177,3 +188,15 @@
         if size % 2 != 0:
             return seq[size / 2]
         return (seq[size / 2] + seq[size / 2 - 1]) / 2.0
+
+
+    def download_file(self, url, local_path):
+        """
+        Downloads a file from the specified URL.
+
+        @param url: URL of the file.
+        @param local_path: the path that the file will be saved to.
+        """
+        logging.info('Downloading "%s" to "%s"', url, local_path)
+        with closing(urllib2.urlopen(url)) as r, open(local_path, 'wb') as w:
+            w.write(r.read())