Xiaomi Pocophone F1 128Gb+6Gb Dual LTE [100/118] Analog audio ports

If device implementations do not include a speaker or audio output port, they:

[C-2-1] MUST NOT report the android.hardware.audio output feature.

[C-2-2] MUST implement the Audio Output related APIs as no-ops at least.

For the purposes of this section, an "output port" is a physical interface such as a 3.5mm audio jack,

HDMI, or USB host mode port with USB audio class. Support for audio output over radio-based

protocols such as Bluetooth, WiFi, or cellular network does not qualify as including an "output port".

7.8.2.1. Analog Audio Ports

In order to be compatible with the headsets and other audio accessories using the 3.5mm audio plug

across the Android ecosystem, if a device implementation includes one or more analog audio ports,

at least one of the audio port(s) SHOULD be a 4 conductor 3.5mm audio jack.

If device implementations have a 4 conductor 3.5mm audio jack, they:

[C-1-1] MUST support audio playback to stereo headphones and stereo headsets with a

microphone.

[C-1-2] MUST support TRRS audio plugs with the CTIA pin-out order.

[C-1-3] MUST support the detection and mapping to the keycodes for the following 3

ranges of equivalent impedance between the microphone and ground conductors on the

audio plug:

70 ohm or less : KEYCODE_HEADSETHOOK

210-290 ohm : KEYCODE_VOLUME_UP

360-680 ohm : KEYCODE_VOLUME_DOWN

[C-1-4] MUST trigger ACTION_HEADSET_PLUG upon a plug insert, but only after all

contacts on plug are touching their relevant segments on the jack.

[C-1-5] MUST be capable of driving at least 150mV ± 10% of output voltage on a 32 ohm

speaker impedance.

[C-1-6] MUST have a microphone bias voltage between 1.8V ~ 2.9V.

[SR] STRONGLY RECOMMENDED to detect and map to the keycode for the following

range of equivalent impedance between the microphone and ground conductors on the

audio plug:

110-180 ohm: KEYCODE_VOICE_ASSIST

SHOULD support audio plugs with the OMTP pin-out order.

SHOULD support audio recording from stereo headsets with a microphone.

If device implementations have a 4 conductor 3.5mm audio jack and support a microphone, and

broadcast the android.intent.action.HEADSET_PLUG with the extra value microphone set as 1, they:

[C-2-1] MUST support the detection of microphone on the plugged in audio accessory.

7.8.3. Near-Ultrasound

Near-Ultrasound audio is the 18.5 kHz to 20 kHz band.

Device implementations:

MUST correctly report the support of near-ultrasound audio capability via the

AudioManager.getProperty API as follows:

If PROPERTY_SUPPORT_MIC_NEAR_ULTRASOUND is "true", the following requirements MUST be met

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