Docs: Add Audio Framework CTS Verifier doc

Bug: 23933605
Change-Id: Icc324d9740acbe53c581592ef5117855125c63e0
diff --git a/src/compatibility/compatibility_toc.cs b/src/compatibility/compatibility_toc.cs
index d69bc28..4db988e 100644
--- a/src/compatibility/compatibility_toc.cs
+++ b/src/compatibility/compatibility_toc.cs
@@ -51,6 +51,7 @@
             </a>
             </div>
            <ul>
+            <li><a href="<?cs var:toroot ?>compatibility/cts/audio-framework.html">Audio Framework</a></li>
             <li><a href="<?cs var:toroot ?>compatibility/cts/camera-hal.html">Camera HAL Testing</a></li>
             <li><a href="<?cs var:toroot ?>compatibility/cts/near-ultrasound.html">Near Ultrasound Tests</a></li>
             <li><a href="<?cs var:toroot ?>compatibility/cts/rotation-vector.html">Rotation Vector Crosscheck</a></li>
diff --git a/src/compatibility/cts/audio-framework.jd b/src/compatibility/cts/audio-framework.jd
new file mode 100644
index 0000000..38637d7
--- /dev/null
+++ b/src/compatibility/cts/audio-framework.jd
@@ -0,0 +1,355 @@
+page.title=Audio Framework CTS Verifier
+@jd:body
+
+<!--
+    Copyright 2016 The Android Open Source Project
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<div id="qv-wrapper">
+  <div id="qv">
+    <h2>In this document</h2>
+    <ol id="auto-toc">
+    </ol>
+  </div>
+</div>
+
+<p>This new suite of tests requires human intervention and some external hardware
+including a <a href="#loopback_latency">Loopback Plug</a>, a <a
+href="#audio_frequency_speaker_test">USB reference microphone</a> and <a
+href="#audio_frequency_microphone_test">external speakers</a>. For devices without 3.5
+mm (⅛”) headset port, the user will be able to skip the test and mark it as
+successful. See the sections below for details.</p>
+
+<h2 id=loopback_latency>Loopback plug latency test</h2>
+
+<p><a
+href="{@docRoot}devices/audio/latency_measure.html#measuringRoundTrip">Round
+trip latency</a> in audio is defined as the time it takes an audio signal to be
+recorded, processed and output back.</p>
+
+<p>To measure round-trip latency using CTS Verifier, connect a loopback
+plug to the 3.5 mm (⅛”) headset connector.  (If you don’t have a loopback plug,
+you can easily make one following the <a
+href="{@docRoot}devices/audio/loopback.html">Audio Loopback Dongle</a>
+instructions.</p>
+
+<table>
+ <tr>
+    <td width="50%">Start CTS Verifier Loopback Test</td>
+    <td width="50%"><img src="images/audio-framework0.png" alt="audio latency loopback" width="300"
+        id="audio_latency_loopback" /></td>
+ </tr>
+ <tr>
+    <td>Summary of instructions is displayed</td>
+    <td><img src="images/audio-framework1.png" alt="summary of instructions" width="300"
+        id="loopback_instructions" /></td>
+ </tr>
+ <tr>
+    <td>Report if the device has a headset port:<br>
+        <strong>YES</strong> if the device under test has a physical headset port<br>
+        <strong>NO</strong> if there is no headset port</td>
+    <td><img src="images/audio-framework-port.png" alt="audio loopback latency" width="300"
+        id="port_check" /></td>
+ </tr>
+ <tr>
+    <td>If the answer was <strong>NO</strong> in the previous step, press
+        <strong>Pass</strong> (green check) on the bottom of the test and finish</td>
+    <td><img src="images/audio-framework-pass.png" alt="audio pass button" width="300"
+        id="port_pass" /></td>
+ </tr>
+ <tr>
+     <td>If the answer was <strong>YES</strong> in the previous step, continue
+         to connect loopback plug.<br>
+         Connect a loopback plug to the headset port<br>
+         Press the <strong>Loopback Plug Ready</strong> button
+    <td><img src="images/audio-framework2.png" alt="audio pass button" width="300"
+        id="port_pass" /></td>
+ </tr>
+ <tr>
+    <td>Move the slider until the signal level is greater than 60%<br>
+        Press <strong>TEST</strong></td>
+    <td><img src="images/audio-framework3.png" alt="audio level 1" width="300"
+        id="audio_level1" />
+        <img src="images/audio-framework4.png" alt="audio level 2" width="300"
+        id="audio_level2"></td>
+ </tr>
+ <tr>
+    <td>Wait several seconds while the latency test is performed</td>
+    <td><img src="images/audio-framework5.png" alt="test running" width="300"
+        id="test_running" /></td>
+ </tr>
+ <tr>
+    <td>When the test is finished, results are shown<br>
+        The minimum confidence level for a test to succeed is 0.6<br>
+        Lower latency numbers are preferred, but no number is enforced</td>
+    <td><img src="images/audio-framework6.png"  alt="test finished" width="300"
+        id="test_finished" />
+</td>
+ </tr>
+ <tr>
+    <td>Press the <strong>Pass</strong> (green, only available if successful) or
+<strong>Failed</strong> (red) button to record the results.</td>
+    <td><img src="images/audio-framework7.png" alt="Pass button" width="300"
+        id="pass_button" /><br>
+        <img src="images/audio-framework8.png" alt="Failed button" width="300"
+        id="failed_button" /></td>
+ </tr>
+</table>
+
+<h2 id=audio_frequency_line_test>Audio frequency line test</h2>
+
+<p>Using a loopback plug, this test will characterize the left/right line audio
+output and use the mic feedback from the plug to capture audio and compute a
+frequency response for each channel.</p>
+
+<p>A simple criterion for minimum energy expected in each band (out of four) is
+applied per channel.</p>
+<table>
+ <tr>
+    <td width="50%">Start CTS Audio Frequency Line Test</td>
+    <td width="50%"><img src="images/audio-framework9.png" alt="start frequency line" width="300"
+        id="start_line_test" /></td>
+ </tr>
+ <tr>
+    <td>Summary of instructions is displayed</td>
+    <td><img src="images/audio-framework10.png" alt="instructions" width="300"
+        id="summary_instructions" /></td>
+ </tr>
+ <tr>
+    <td>Report if the device has a headset port:<br>
+        <strong>YES</strong> if the device under test has a physical headset port<br>
+        <strong>NO</strong> if there is no headset port</td>
+    <td><img src="images/audio-framework-line-port.png" alt="audio frequency line" width="300"
+        id="line_port_check" /></td>
+ </tr>
+ <tr>
+    <td>If the answer was <strong>NO</strong> in the previous step, press
+        <strong>Pass</strong> (green check) on the bottom of the test and finish</td>
+    <td><img src="images/audio-framework-pass.png" alt="audio pass button" width="300"
+        id="port_pass" /></td>
+ </tr>
+ <tr>
+     <td>If the answer was <strong>YES</strong> in the previous step, continue
+         to connect loopback plug<br>
+	 Connect a Loopback Plug to the headset connector (see <a
+         href="#loopback_latency">Loopback plug latency test</a>)<br>
+         Press the <strong>Loopback Plug Ready</strong> button
+    <td><img src="images/audio-framework11.png" alt="loopback plug ready" width="300"
+        id="port_pass" /></td>
+ </tr>
+    <td>Press <strong>TEST</strong></td>
+    <td><img src="images/audio-framework12.png" alt="loopback plug test" width="300"
+        id="loopback_plug_test" /></td>
+ </tr>
+ <tr>
+    <td>Wait several seconds while the frequency tests are performed</td>
+    <td><img src="images/audio-framework13.png" alt="testing left capture" width="300"
+        id="left_capture" /></td>
+ </tr>
+ <tr>
+    <td>When the test is finished, results are shown</td>
+    <td><img src="images/audio-framework14.png" alt="testing complete" width="300"
+        id="test_complete" /></td>
+ </tr>
+    <td>Press the <strong>Pass</strong> (only available if successful) or
+        <strong>Failed</strong> button to record the results</td>
+    <td><img src="images/audio-framework15.png" alt="Pass button" width="300"
+        id="pass_button" /><br>
+        <img src="images/audio-framework16.png" alt="Failed button" width="300"
+        id="failed_button" /></td>
+ </tr>
+</table>
+
+<h2 id=audio_frequency_speaker_test>Audio frequency speaker test</h2>
+
+<p>This test uses the signal captured by an external USB reference microphone to
+assess the frequency response of left (and right, if it exists) loudspeakers.</p>
+
+<p>A reference microphone is defined as that one that delivers flat, uncolored
+response. They are often used for analysis and measurement equipment.  </p>
+
+<p>There are some inexpensive USB Reference microphones (e.g., <a
+href="https://minidsp.com/products/acoustic-measurement/umik-1">miniDSP USB
+Measurement calibrated microphone</a>, <a
+href="http://www.daytonaudio.com/index.php/umm-6-usb-measurement-microphone.html">Dayton
+Audio UMM-6 USB Measurement Microphone</a>), mostly used for the home theater
+enthusiasts to calibrate their setups.</p>
+
+<p>Minimum recommended reference microphone characteristics:<br>
+Flat Frequency response on range 100 Hz - 20 kHz:  +/- 2 dB<br>
+ S/N ration 70 dB (A-weighted)<br>
+ THD Ratio @ 1000 Hz less than 1 % at 127 dB SPL<p>
+
+<table>
+ <tr>
+    <td width="50%">Start CTS Audio Frequency Speaker Test</td>
+    <td width="50%"><img src="images/audio-framework17.png" alt="start speaker test" width="300"
+        id="start_speaker" /></td>
+ </tr>
+ <tr>
+    <td>Summary of instructions is displayed</td>
+    <td><img src="images/audio-framework18.png" alt="instructions" width="300"
+        id="summary_instructions" /></td>
+ </tr>
+ <tr>
+    <td>Connect a USB reference microphone (see <a
+        href="#audio_frequency_speaker_test">Audio frequency speaker test</a>)<br>
+        Press <strong>USB REFERENCE MICROPHONE READY</strong></td>
+    <td><img src="images/audio-framework19.png"  alt="mic ready" width="300"
+        id="mic_ready" /></td>
+ </tr>
+ <tr>
+    <td>Set up DUT (Device Under Test) in a quiet room and USB microphone 20cms
+perpendicular to center of screen</td>
+    <td><img src="images/audio-framework20.png" alt="device under test" width="300"
+        id="dut" /></td>
+ </tr>
+ <tr>
+    <td>Press <strong>TEST</strong></td>
+    <td><img src="images/audio-framework21.png" alt="click test" width="300"
+        id="click_test" /></td>
+ </tr>
+ <tr>
+    <td>Wait several seconds while the frequency tests are performed</td>
+    <td><img src="images/audio-framework22.png" alt="test underway" width="300"
+        id="right_capture" /></td>
+ </tr>
+ <tr>
+    <td>When the test is finished, results are shown</td>
+    <td><img src="images/audio-framework23.png" alt="test complete" width="300"
+        id="test_complete" /></td>
+ </tr>
+ </tr>
+    <td>Press the <strong>Pass</strong> (only available if successful) or
+        <strong>Failed</strong> button to record the results</td>
+    <td><img src="images/audio-framework24.png" alt="Pass button" width="300"
+        id="pass_button" /><br>
+        <img src="images/audio-framework25.png" alt="Failed button" width="300"
+        id="failed_button" /></td>
+ </tr>
+</table>
+
+<h2 id=audio_frequency_microphone_test>Audio frequency microphone test</h2>
+
+<p>This test is more involved than the previous ones. It requires the use of both:
+External speakers for a white noise sound source, and a USB reference
+microphone to use as a reference for the sound.  Although this process is more
+involved, it can be performed with affordable, easy to get, hardware</p>
+
+<p>External speakers positioned 40cm from the device are used to deliver a white
+noise sound source.  These speakers don’t need to have a “Flat” frequency
+response, but need good coverage from low frequencies (100 hz) to high
+frequencies (20khz) is expected which is usually met by portable or medium size
+self powered speakers (e.g. Sony SRS-X5 portable speakers) </p>
+
+<p>The key element here is that a step for calibration (using the USB reference
+microphone) is performed, to estimate the actual response of the speakers, thus
+have a solid reference to compare the built in microphone against.</p>
+<table>
+ <tr>
+    <td width="50%">Start CTS Audio Frequency Microphone Test</td>
+    <td width="50%"><img src="images/audio-framework26.png" alt="start mic test" width="300"
+        id="start_mic_test" /></td>
+ </tr>
+ <tr>
+    <td>Summary of instructions is displayed</td>
+    <td><img src="images/audio-framework27.png" alt="instructions" width="300"
+        id="summary_instructions" /></td>
+ </tr>
+ <tr>
+    <td>Set up DUT in a quiet room<br>
+        Position the speakers 40cm perpendicular to the center of the screen
+        of the DUT (see <a href="#audio_frequency_microphone_test">Audio
+        frequency microphone test </a>)</td>
+    <td><img src="images/audio-framework28.png" alt="device under test" width="300"
+        id="device_position" /></td>
+ </tr>
+ <tr>
+    <td>Report if the device has a headset port:<br>
+        <strong>YES</strong> if the device under test has a physical headset port<br>
+        <strong>NO</strong> if there is no headset port</td>
+    <td><img src="images/audio-framework-mic-port.png" alt="audio microphone test" width="300"
+        id="mic_port_check" /></td>
+ </tr>
+ <tr>
+    <td>If the answer was <strong>NO</strong> in the previous step, press
+        <strong>Pass</strong> (green check) on the bottom of the test and finish</td>
+    <td><img src="images/audio-framework-pass.png" alt="mic headset pass button" width="300"
+        id="mic_port_pass" /></td>
+ </tr>
+ <tr>
+    <td>If the answer was <strong>YES</strong> in the previous step, continue
+        to connect external speakers.<br>
+        Connect external speakers using the headphone/line out connector
+        (remember to unplug any USB microphone)<br>
+        Press <strong>EXTERNAL SPEAKERS READY</strong></td>
+    <td><img src="images/audio-framework29.png" alt="external speakers ready" width="300"
+        id="speakers_ready" /></td>
+ </tr>
+ <tr>
+    <td>Press <strong>TEST 1</strong></td>
+    <td><img src="images/audio-framework30.png" alt="no USB device" width="300"
+        id="no_usb_device" /></td>
+ </tr>
+ <tr>
+    <td>Wait several seconds for test 1 to complete.</td>
+    <td><img src="images/audio-framework31.png" alt="testing underway" width="300"
+        id="testing_incomplete" /></td>
+ </tr>
+ <tr>
+    <td>When test 1 is completed, results for the built in microphone are shown.</td>
+    <td><img src="images/audio-framework32.png" alt="test results" width="300"
+        id="testing_complete" /></td>
+ </tr>
+ <tr>
+    <td>Connect a USB Reference microphone (see <a
+        href="#audio_frequency_speaker_test">Audio frequency speaker test
+        </a>)<br>
+        Press <strong>USB REFERENCE MICROPHONE READY</strong></td>
+    <td><img src="images/audio-framework33.png" alt="microphone ready" width="300"
+        id="mic_ready" /></td>
+ </tr>
+ <tr>
+    <td>Position USB microphone right next to built-in microphone in DUT,
+        pointing towards external speakers</td>
+    <td><img src="images/audio-framework34.jpg" alt="device position" width="300"
+        id="device_position" /><br>
+        <img src="images/audio-framework35.png" alt="mic position" width="300"
+        id="mic-position" /></td>
+ </tr>
+ <tr>
+    <td>Press <strong>TEST 2</strong></td>
+    <td><img src="images/audio-framework36.png" alt="USB detected" width="300"
+        id="usb-detected" /></td>
+ </tr>
+ <tr>
+    <td>Wait several seconds while the test 2 runs</td>
+    <td><img src="images/audio-framework37.png" alt="test running" width="132"
+        id="test_running" /></td>
+ </tr>
+ <tr>
+    <td>When test 2 is completed, results for the USB reference microphone are
+        shown.</td>
+    <td><img src="images/audio-framework38.png" alt="testing completed" width="300"
+        id="testing_completed" /></td>
+ </tr>
+ <tr>
+    <td>Press the <strong>Pass</strong> (only available if successful) or
+<strong>Failed</strong> button to record the results.</td>
+    <td><img src="images/audio-framework39.png" alt="Pass button" width="300"
+        id="pass_button" /><br>
+        <img src="images/audio-framework40.png" alt="Failed button" width="300"
+        id="failed_button" /></td>
+ </tr>
+</table>
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