Lines Matching refs:time
7 - Trigger_tstamp is the system time snapshot taken when the .trigger
19 The difference (tstamp - trigger_tstamp) defines the elapsed time.
26 The use of these different pointers and time information depends on
30 - ``delay`` reports the time it will take to hear a new sample after all
34 along with a snapshot of system time. Applications can select from
42 of time as measured by different components of audio hardware. In
47 --------------------------------------------------------------> time
51 time time time time time
58 The analog time is taken at the last stage of the playback, as close
61 The link time is taken at the output of the SoC/chipset as the samples
62 are pushed on a link. The link time can be directly measured if
67 The DMA time is measured using counters - typically the least reliable
70 The app time corresponds to the time tracked by an application after
74 audio time it wants reported by selecting the relevant settings in
77 measurement. Direct access to the link time is very interesting on
79 time with dedicated hardware, possibly synchronized with system time,
85 timestamp will report the DMA time based on the hw_pointer value.
90 streams and to the DMA time (hw_ptr) in all other cases.
95 - for dma time (default), the granularity of the transfers can be
100 - the link time can be used to track long-term drifts between audio
101 and system time using the (tstamp-trigger_tstamp)/audio_tstamp
103 filtering is required. The link time can be either reset on startup
107 hardware, the absolute link time could also be used to define a
108 precise start time (patches WIP)
128 at a time. This is a conscious design decision, reading the audio
129 timestamps from hardware registers or from IPC takes time, the more
152 playback: systime: 341121338 nsec, audio time 342000000 nsec, systime delta -878662
153 playback: systime: 426236663 nsec, audio time 427187500 nsec, systime delta -950837
154 playback: systime: 597080580 nsec, audio time 598000000 nsec, systime delta -919420
155 playback: systime: 682059782 nsec, audio time 683020833 nsec, systime delta -961051
156 playback: systime: 852896415 nsec, audio time 853854166 nsec, systime delta -957751
157 playback: systime: 937903344 nsec, audio time 938854166 nsec, systime delta -950822
163 playback: systime: 341053347 nsec, audio time 341062500 nsec, systime delta -9153
164 playback: systime: 426072447 nsec, audio time 426062500 nsec, systime delta 9947
165 playback: systime: 596899518 nsec, audio time 596895833 nsec, systime delta 3685
166 playback: systime: 681915317 nsec, audio time 681916666 nsec, systime delta -1349
167 playback: systime: 852741306 nsec, audio time 852750000 nsec, systime delta -8694
173 playback: systime: 341060004 nsec, audio time 341062791 nsec, systime delta -2787
174 playback: systime: 426242074 nsec, audio time 426244875 nsec, systime delta -2801
175 playback: systime: 597080992 nsec, audio time 597084583 nsec, systime delta -3591
176 playback: systime: 682084512 nsec, audio time 682088291 nsec, systime delta -3779
177 playback: systime: 852936229 nsec, audio time 852940916 nsec, systime delta -4687
178 playback: systime: 938107562 nsec, audio time 938112708 nsec, systime delta -5146
181 ahead of the actual playback time (as a side time this sort of
190 offset between audio time and system time due to buffering. Example 4
198 playback: systime: 120174019 nsec, audio time 125000000 nsec, systime delta -4825981
199 playback: systime: 245041136 nsec, audio time 250000000 nsec, systime delta -4958864
200 playback: systime: 370106088 nsec, audio time 375000000 nsec, systime delta -4893912
201 playback: systime: 495040065 nsec, audio time 500000000 nsec, systime delta -4959935
202 playback: systime: 620038179 nsec, audio time 625000000 nsec, systime delta -4961821
203 playback: systime: 745087741 nsec, audio time 750000000 nsec, systime delta -4912259
204 playback: systime: 870037336 nsec, audio time 875000000 nsec, systime delta -4962664
210 playback: systime: 120190520 nsec, audio time 120000000 nsec, systime delta 190520
211 playback: systime: 245036740 nsec, audio time 244000000 nsec, systime delta 1036740
212 playback: systime: 370034081 nsec, audio time 369000000 nsec, systime delta 1034081
213 playback: systime: 495159907 nsec, audio time 494000000 nsec, systime delta 1159907
214 playback: systime: 620098824 nsec, audio time 619000000 nsec, systime delta 1098824
215 playback: systime: 745031847 nsec, audio time 744000000 nsec, systime delta 1031847