Xiaomi Redmi Note 8 Pro 64Gb+6Gb Dual LTE Руководство по эксплуатации онлайн [64/132] 755554
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Xiaomi Redmi Note 8 Pro 64Gb+6Gb Dual LTE Руководство по эксплуатации онлайн [64/132] 755554

Xiaomi Redmi Note 8 Pro 64Gb+6Gb Dual LTE Руководство по эксплуатации онлайн [64/132] 755554
output latency . The interval between when an application writes a frame of PCM-coded
data and when the corresponding sound is presented to environment at an on-device
transducer or signal leaves the device via a port and can be observed externally.
cold output latency . The output latency for the first frame, when the audio output system
has been idle and powered down prior to the request.
continuous output latency . The output latency for subsequent frames, after the device is
playing audio.
input latency . The interval between when a sound is presented by environment to device
at an on-device transducer or signal enters the device via a port and when an application
reads the corresponding frame of PCM-coded data.
lost input . The initial portion of an input signal that is unusable or unavailable.
cold input latency . The sum of lost input time and the input latency for the first frame,
when the audio input system has been idle and powered down prior to the request.
continuous input latency . The input latency for subsequent frames, while the device is
capturing audio.
cold output jitter . The variability among separate measurements of cold output latency
values.
cold input jitter . The variability among separate measurements of cold input latency
values.
continuous round-trip latency . The sum of continuous input latency plus continuous
output latency plus one buffer period. The buffer period allows time for the app to process
the signal and time for the app to mitigate phase difference between input and output
streams.
OpenSL ES PCM buffer queue API . The set of PCM-related OpenSL ES APIs within
Android NDK .
AAudio native audio API . The set of AAudio APIs within Android NDK .
Timestamp . A pair consisting of a relative frame position within a stream and the
estimated time when that frame enters or leaves the audio processing pipeline on the
associated endpoint. See also AudioTimestamp .
If device implementations declare android.hardware.audio.output they are STRONGLY RECOMMENDED to
meet or exceed the following requirements:
[C-SR] Cold output latency of 100 milliseconds or less
[C-SR] Continuous output latency of 45 milliseconds or less
[C-SR] Minimize the cold output jitter
[C-SR] The output timestamp returned by AudioTrack.getTimestamp and
AAudioStream_getTimestamp is accurate to +/- 1 ms.
If device implementations meet the above requirements, after any initial calibration, when using both
the OpenSL ES PCM buffer queue and AAudio native audio APIs, for continuous output latency and
cold output latency over at least one supported audio output device, they are:
[C-SR] STRONGLY RECOMMENDED to report low-latency audio by declaring
android.hardware.audio.low_latency feature flag.
[C-SR] STRONGLY RECOMMENDED to meet the requirements for low-latency audio via the
AAudio API.
[C-SR] STRONGLY RECOMMENDED to ensure that for streams that return
AAUDIO_PERFORMANCE_MODE_LOW_LATENCY from AAudioStream_getPerformanceMode() ,
the value returned by AAudioStream_getFramesPerBurst() is less than or equal to the value
returned by android.media.AudioManager.getProperty(String) for property key
AudioManager.PROPERTY_OUTPUT_FRAMES_PER_BUFFER .
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