Xiaomi Redmi Note 8 Pro 64Gb+6Gb Dual LTE [108/132] Microphone

specified in the USB HID Usage Tables and the Voice Command Usage Request to the

KeyEvent constants as below:

Usage Page (0xC) Usage ID (0x0CD): KEYCODE_MEDIA_PLAY_PAUSE

Usage Page (0xC) Usage ID (0x0E9): KEYCODE_VOLUME_UP

Usage Page (0xC) Usage ID (0x0EA): KEYCODE_VOLUME_DOWN

Usage Page (0xC) Usage ID (0x0CF): KEYCODE_VOICE_ASSIST

If device implementations include a USB port supporting host mode and the Storage Access

Framework (SAF), they:

[C-3-1] MUST recognize any remotely connected MTP (Media Transfer Protocol) devices

and make their contents accessible through the ACTION_GET_CONTENT ,

ACTION_OPEN_DOCUMENT , and ACTION_CREATE_DOCUMENT intents. .

If device implementations include a USB port supporting host mode and USB Type-C, they:

[C-4-1] MUST implement Dual Role Port functionality as defined by the USB Type-C

specification (section 4.5.1.3.3).

[SR] STRONGLY RECOMMENDED to support DisplayPort, SHOULD support USB

SuperSpeed Data Rates, and are STRONGLY RECOMMENDED to support Power Delivery

for data and power role swapping.

[SR] STRONGLY RECOMMENDED to NOT support Audio Adapter Accessory Mode as

described in the Appendix A of the USB Type-C Cable and Connector Specification

Revision 1.2 .

SHOULD implement the Try.* model that is most appropriate for the device form factor.

For example a handheld device SHOULD implement the Try.SNK model.

7.8. Audio

7.8.1. Microphone

If device implementations include a microphone, they:

[C-1-1] MUST report the android.hardware.microphone feature constant.

[C-1-2] MUST meet the audio recording requirements in section 5.4 .

[C-1-3] MUST meet the audio latency requirements in section 5.6 .

[SR] Are STRONGLY RECOMMENDED to support near-ultrasound recording as described

in section 7.8.3 .

If device implementations omit a microphone, they:

[C-2-1] MUST NOT report the android.hardware.microphone feature constant.

[C-2-2] MUST implement the audio recording API at least as no-ops, per section 7 .

7.8.2. Audio Output

If device implementations include a speaker or an audio/multimedia output port for an audio output

peripheral such as a 4 conductor 3.5mm audio jack or USB host mode port using USB audio class ,

they:

[C-1-1] MUST report the android.hardware.audio.output feature constant.

[C-1-2] MUST meet the audio playback requirements in section 5.5 .

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