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Diffstat (limited to 'en/devices/accessories')
| -rw-r--r-- | en/devices/accessories/headset/usb-adapter.html | 112 | ||||
| -rw-r--r-- | en/devices/accessories/headset/usb-device.html | 124 | ||||
| -rw-r--r-- | en/devices/accessories/headset/usb-headset-spec.html | 118 |
3 files changed, 276 insertions, 78 deletions
diff --git a/en/devices/accessories/headset/usb-adapter.html b/en/devices/accessories/headset/usb-adapter.html new file mode 100644 index 00000000..4b70bc1d --- /dev/null +++ b/en/devices/accessories/headset/usb-adapter.html @@ -0,0 +1,112 @@ +<html devsite> + <head> + <title>USB-C-to-Analog Audio Adapter</title> + <meta name="project_path" value="/_project.yaml" /> + <meta name="book_path" value="/_book.yaml" /> + </head> + <body> + <!-- + Copyright 2018 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. + --> + + + +<p> +While some new Android phones are being produced without a 3.5 mm jack, users +may still own 3.5 mm headsets that they want to use with those devices. To +facilitate that, this article specifies a USB-C-to-analog audio adapter spec to +plug +<a href="/devices/accessories/headset/plug-headset-spec.html">3.5 mm headsets</a> +into devices that only have a +<a href="/devices/accessories/headset/usb-device">USB-C port</a>.</p> +<p> +This documentation specifies the minimum requirements: accessory manufacturers +are encouraged to add features while keeping these requirements in mind. +</p> + +<h2 id="adapter-type">Adapter type</h2> +<p> +Only digital-to-analog adapters are allowed. Analog-only adapters following +<a href="http://www.usb.org/">USB.org's</a> "USB Type-C Cable and Connector +Specification, Release 1.2, Appendix A" are not supported. +</p> +<h2 id="functional-overview">Functional overview</h2> +<p> +The adapter allows users to plug their existing 3.5mm accessories into devices +with USB-C ports. To do this, the adapter supports: +</p> +<ul> + <li>Stereo analog devices with and without microphones</li> + <li>Digital to analog conversion of 2 output channels</li> + <li>Analog to digital conversion of 1 input channel</li> + <li>Detection of analog device insertion</li> + <li>Detection of headset microphone</li> + <li>Detection of output impedance</li> + <li>Translation of headset button events to HID events</li> +</ul> + +<h2 id="analog-interface">Analog interface</h2> +<p> +The adapter shall not present any UAC interface, playback, or capture endpoints +to the USB host until a device is inserted and properly identified. Depending on +the type of device detected, the following UAC terminal types must be reported: +</p> + +<ul> + <li><strong>Headphones</strong>. Low impedance transducers, < 1 kiloohm, no + microphone: 0x0302</li> + <li><strong>Headset</strong>. Low impedance transducers with microphone: 0x0402</li> + <li><strong>Line in</strong>. High impedance input: 0x603</li> + <li><strong>Line out</strong>. High impedance output: 0x604</li> + <li><strong>Line in and Line out</strong> or <strong>Line in and Mic</strong>: + 0x400</li> +</ul> + +<h2 id="button-functions">Button functions</h2> +<p> +The adapter shall convert button events received from the analog interface and +conforming to the Android +<a href="/devices/accessories/headset/plug-headset-spec">analog headset +specification</a> to the following HID events: </p> +<table> + <tr> + <th>Function</th> + <th>Mappings</th> + </tr> + <tr> + <td>A</td> + <td>HID usage page: 0x0C<br> + HID usage: 0x0CD </td> + </tr> + <tr> + <td>B </td> + <td>HID usage page: 0x0C<br> + HID usage: 0x0E9</td> + </tr> + <tr> + <td>C</td> + <td>HID usage page: 0x0C<br> + HID usage: 0x0EA</td> + </tr> + <tr> + <td>D </td> + <td>HID usage page: 0x0C<br> + HID usage: 0x0CF</td> + </tr> +</table> + + </body></html> + + diff --git a/en/devices/accessories/headset/usb-device.html b/en/devices/accessories/headset/usb-device.html new file mode 100644 index 00000000..4cc73939 --- /dev/null +++ b/en/devices/accessories/headset/usb-device.html @@ -0,0 +1,124 @@ +<html devsite> + <head> + <title>USB Headset: Device Specification</title> + <meta name="project_path" value="/_project.yaml" /> + <meta name="book_path" value="/_book.yaml" /> + </head> + <body> + <!-- + Copyright 2017 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. + --> + + + +<p> +For USB headsets to work seamlessly across the Android ecosystem, Android +devices must support them uniformly. This documentation specifies USB +behavior to support USB headsets and adapters across the Android ecosystem. +</p> + +<h2 id="software-mapping">Software mapping</h2> +<p> +Compatible USB headsets are required to support compatible HID mappings. +Device support is required for the following keycode mappings. +</p> + +<table> + <tr> + <th>Function</th> + <th>Mappings</th> + <th>Context</th> + <th>Behavior</th> + </tr> + <tr> + <td rowspan="6">A</td> + <td rowspan="6"><strong>HID usage page</strong>: 0x0C<br> + <strong>HID usage</strong>: 0x0CD<br> + <strong>Kernel key</strong>: <code>KEY_PLAYPAUSE</code><br> + <strong>Android key</strong>: <code>KEYCODE_MEDIA_PLAY_PAUSE</code></td> + <td rowspan="2">Media playback</td> + <td><strong>Input</strong>: Short press<br> + <strong>Output</strong>: Play or pause</td> + </tr> + <tr> + <td><strong>Input</strong>: Long press<br> + <strong>Output</strong>: Launch voice command<br> + <strong>Sends</strong>: + <code>android.speech.action.VOICE_SEARCH_HANDS_FREE</code> if the device + is locked or its screen is off. Sends + <code>android.speech.RecognizerIntent.ACTION_WEB_SEARCH</code> otherwise</td> + </tr> + <tr> + <td rowspan="2">Incoming call</td> + <td><strong>Input</strong>: Short press<br> + <strong>Output</strong>: Accept call</td> + </tr> + <tr> + <td><strong>Input</strong>: Long press<br> + <strong>Output</strong>: Reject call</td> + </tr> + <tr> + <td rowspan="2">Ongoing call</td> + <td><strong>Input</strong>: Short press<br> + <strong>Output</strong>: End call</td> + </tr> + <tr> + <td><strong>Input</strong>: Long press<br> + <strong>Output</strong>: Mute or unmute microphone</td> + </tr> + <tr> + <td>B</td> + <td><strong>HID usage page</strong>: 0x0C<br> + <strong>HID usage</strong>: 0x0E9<br> + <strong>Kernel key</strong>: <code>KEY_VOLUMEUP</code><br> + <strong>Android key</strong>: <code>VOLUME_UP</code></td> + <td>Media playback, Ongoing call</td> + <td><strong>Input</strong>: Short or long press<br> + <strong>Output</strong>: Increases the system or headset volume</td> + </tr> + <tr> + <td>C</td> + <td><strong>HID usage page</strong>: 0x0C<br> + <strong>HID usage</strong>: 0x0EA<br> + <strong>Kernel key</strong>: <code>KEY_VOLUMEDOWN</code><br> + <strong>Android key</strong>: <code>VOLUME_DOWN</code></td> + <td>Media playback, Ongoing call</td> + <td><strong>Input</strong>: Short or long press<br> + <strong>Output</strong>: Decreases the system or headset volume</td> + </tr> + <tr> + <td>D</td> + <td><strong>HID usage page</strong>: 0x0C<br> + <strong>HID usage</strong>: 0x0CF<br> + <strong>Kernel key</strong>: <code>KEY_VOICECOMMAND</code><br> + <strong>Android key</strong>: <code>KEYCODE_VOICE_ASSIST</code></td> + <td>All. Can be triggered in any instance.</td> + <td><strong>Input</strong>: Short or long press<br> + <strong>Output</strong>: Launch voice command</td> + </tr> +</table> + +<h2 id="mechanical">Mechanical</h2> +<p> +Device manufacturers should also consult the +<a href="/devices/audio/usb.html">USB Digital Audio</a> page for more +information about USB implementation on Android. +Device manufacturers must also follow the requirements in the +<a href="/compatibility/android-cdd.html#7_7_usb">USB section</a> of +the Android CDD. +</p> + + </body> +</html> diff --git a/en/devices/accessories/headset/usb-headset-spec.html b/en/devices/accessories/headset/usb-headset-spec.html index 3279eee1..9302fe09 100644 --- a/en/devices/accessories/headset/usb-headset-spec.html +++ b/en/devices/accessories/headset/usb-headset-spec.html @@ -24,25 +24,34 @@ <p> -This documentation specifies USB headset buttons behavior to function uniformly -across the Android ecosystem. Device manufacturers should also consult the -<a href="/devices/audio/usb.html">USB -Digital Audio</a> page for more information about USB implementation on Android -and the <a href="/compatibility/android-cdd.html">Android Compatibility -Definition Document (CDD)</a> for requirements related to Android devices. -</p> -<p>There are also specifications for -<a href="plug-headset-spec.html">3.5 mm headsets</a> for accessory manufacturers and -<a href="jack-headset-spec.html">3.5 mm jacks</a> for device manufacturers. +This documentation specifies some characteristics of USB headsets, so that +they function uniformly across the Android ecosystem. Only headsets with +digital USB audio interface are permitted. Purely analog headsets with +mechanical adaptation to USB-C are not permitted, as per USB Type-C +specification. </p> <p> This documentation specifies the minimum requirements: accessory manufacturers are encouraged to add features while keeping these requirements in mind. </p> -<h2 id="control-function-mapping">Control-function mapping</h2> + +<h2 id="functional-overview">Functional overview</h2> +<p> +USB headsets can implement a variety of basic and advanced features. This +specification only covers mandated basic features: +</p> +<ul> + <li>Stereo output</li> + <li>Optional, but recommended, microphone</li> + <li>Function buttons for volume, playback, and call control</li> +</ul> + +<h2 id="control-function">Control functions</h2> +<p>Headsets can come with varying number of buttons to control specific +functions, such as volume and play/pause.<p> <table> <tr> - <th>Control Function</th> + <th>Control function</th> <th>Accessory Support</th> <th>Description</th> </tr> @@ -92,82 +101,34 @@ on a second key press). <h2 id="software-mapping">Software mapping</h2> <p> Compatible USB headsets are required to support the following software mappings -for the headset buttons. Device support is required for the following software -mappings. +for the headset buttons. Devices match these HID mappings with the appropriate +Android keycode. </p> <table> <tr> <th>Function</th> <th>Mappings</th> - <th>Context</th> - <th>Behavior</th> - </tr> - <tr> - <td rowspan="6">A</td> - <td rowspan="6"><strong>HID usage page</strong>: 0x0C<br> - <strong>HID usage</strong>: 0x0CD<br> - <strong>Kernel key</strong>: <code>KEY_PLAYPAUSE</code><br> - <strong>Android key</strong>: <code>KEYCODE_MEDIA_PLAY_PAUSE</code></td> - <td rowspan="2">Media playback</td> - <td><strong>Input</strong>: Short press<br> - <strong>Output</strong>: Play or pause</td> - </tr> - <tr> - <td><strong>Input</strong>: Long press<br> - <strong>Output</strong>: Launch voice command<br> - <strong>Sends</strong>: - <code>android.speech.action.VOICE_SEARCH_HANDS_FREE</code> if the device - is locked or its screen is off. Sends - <code>android.speech.RecognizerIntent.ACTION_WEB_SEARCH</code> otherwise</td> - </tr> - <tr> - <td rowspan="2">Incoming call</td> - <td><strong>Input</strong>: Short press<br> - <strong>Output</strong>: Accept call</td> </tr> <tr> - <td><strong>Input</strong>: Long press<br> - <strong>Output</strong>: Reject call</td> - </tr> - <tr> - <td rowspan="2">Ongoing call</td> - <td><strong>Input</strong>: Short press<br> - <strong>Output</strong>: End call</td> - </tr> - <tr> - <td><strong>Input</strong>: Long press<br> - <strong>Output</strong>: Mute or unmute microphone</td> + <td>A</td> + <td>HID usage page: 0x0C<br> + HID usage: 0x0CD </td> </tr> <tr> - <td>B</td> - <td><strong>HID usage page</strong>: 0x0C<br> - <strong>HID usage</strong>: 0x0E9<br> - <strong>Kernel key</strong>: <code>KEY_VOLUMEUP</code><br> - <strong>Android key</strong>: <code>VOLUME_UP</code></td> - <td>Media playback, Ongoing call</td> - <td><strong>Input</strong>: Short or long press<br> - <strong>Output</strong>: Increases the system or headset volume</td> + <td>B </td> + <td>HID usage page: 0x0C<br> + HID usage: 0x0E9</td> </tr> <tr> <td>C</td> - <td><strong>HID usage page</strong>: 0x0C<br> - <strong>HID usage</strong>: 0x0EA<br> - <strong>Kernel key</strong>: <code>KEY_VOLUMEDOWN</code><br> - <strong>Android key</strong>: <code>VOLUME_DOWN</code></td> - <td>Media playback, Ongoing call</td> - <td><strong>Input</strong>: Short or long press<br> - <strong>Output</strong>: Decreases the system or headset volume</td> + <td>HID usage page: 0x0C<br> + HID usage: 0x0EA</td> </tr> <tr> - <td>D</td> - <td><strong>HID usage page</strong>: 0x0C<br> - <strong>HID usage</strong>: 0x0CF<br> - <strong>Kernel key</strong>: <code>KEY_VOICECOMMAND</code><br> - <strong>Android key</strong>: <code>KEYCODE_VOICE_ASSIST</code></td> - <td>All. Can be triggered in any instance.</td> - <td><strong>Input</strong>: Short or long press<br> - <strong>Output</strong>: Launch voice command</td> + <td>D </td> + <td>HID usage page: 0x0C<br> + HID usage: 0x0CF</td> </tr> </table> @@ -176,16 +137,17 @@ collection. For accessories without a microphone, use Headphone (Usage Page: Consumer (0x0C), Usage: Headphone (0x05)). For accesories with a microphone, use Headset (Usage Page: Telephony (0x0B), Usage: Headset (0x05)).</p> +<h2 id="output-level">Output level</h2> +<p> +The maximum sound pressure level shall comply to any regulatory requirement in +the country of destination. +</p> + <h2 id="mechanical">Mechanical</h2> <p> Accessory manufacturers must follow the requirements for USB connectors as specified by <a href="http://www.usb.org/">USB.org</a>. </p> -<p> -Device manufacturers must follow the requirements in the -<a href="/compatibility/android-cdd.html#7_7_usb">USB section</a> of -the Android CDD. -</p> </body> </html> |