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Pocophone F1 128Gb+6Gb Dual LTE
Руководство по эксплуатации Страница: 63

Xiaomi Pocophone F1 128Gb+6Gb Dual LTE Руководство по эксплуатации онлайн [63/118] 775101

[C-1-4] MUST report support for feature android.software.midi .

[C-1-5] MUST meet latencies and USB audio requirements using the OpenSL ES PCM

buffer queue API.

SHOULD provide a sustainable level of CPU performance while audio is active.

SHOULD minimize audio clock inaccuracy and drift relative to standard time.

SHOULD minimize audio clock drift relative to the CPU CLOCK_MONOTONIC when both are

active.

SHOULD minimize audio latency over on-device transducers.

SHOULD minimize audio latency over USB digital audio.

SHOULD document audio latency measurements over all paths.

SHOULD minimize jitter in audio buffer completion callback entry times, as this affects

usable percentage of full CPU bandwidth by the callback.

SHOULD provide zero audio underruns (output) or overruns (input) under normal use at

reported latency.

SHOULD provide zero inter-channel latency difference.

SHOULD minimize MIDI mean latency over all transports.

SHOULD minimize MIDI latency variability under load (jitter) over all transports.

SHOULD provide accurate MIDI timestamps over all transports.

SHOULD minimize audio signal noise over on-device transducers, including the period

immediately after cold start.

SHOULD provide zero audio clock difference between the input and output sides of

corresponding end-points, when both are active. Examples of corresponding end-points

include the on-device microphone and speaker, or the audio jack input and output.

SHOULD handle audio buffer completion callbacks for the input and output sides of

corresponding end-points on the same thread when both are active, and enter the output

callback immediately after the return from the input callback. Or if it is not feasible to

handle the callbacks on the same thread, then enter the output callback shortly after

entering the input callback to permit the application to have a consistent timing of the

input and output sides.

SHOULD minimize the phase difference between HAL audio buffering for the input and

output sides of corresponding end-points.

SHOULD minimize touch latency.

SHOULD minimize touch latency variability under load (jitter).

If device implementations meet all of the above requirements, they:

[SR] STRONGLY RECOMMENDED to report support for feature android.hardware.audio.pro via

the android.content.pm.PackageManager class.

If device implementations meet the requirements via the OpenSL ES PCM buffer queue API, they:

[SR] STRONGLY RECOMMENDED to also meet the same requirements via the AAudio API.

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

[C-2-1] MUST have the continuous round-trip audio latency to be 20 milliseconds or less

over the audio jack path.

[SR] STRONGLY RECOMMENDED to comply with section Mobile device (jack)

specifications of the Wired Audio Headset Specification (v1.1) .

The continuous round-trip audio latency SHOULD be 10 milliseconds or less over the

audio jack path.

Page 63 of 118

Xiaomi Pocophone F1 128Gb+6Gb Dual LTE Руководство по эксплуатации онлайн [63/118] 775101

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