Lines Matching refs:time
3 - Trigger_tstamp is the system time snapshot taken when the .trigger
15 The difference (tstamp - trigger_tstamp) defines the elapsed time.
22 The use of these different pointers and time information depends on
26 - 'delay' reports the time it will take to hear a new sample after all
30 along with a snapshot of system time. Applications can select from
38 of time as measured by different components of audio hardware. In
43 --------------------------------------------------------------> time
47 time time time time time
53 The analog time is taken at the last stage of the playback, as close
56 The link time is taken at the output of the SOC/chipset as the samples
57 are pushed on a link. The link time can be directly measured if
62 The DMA time is measured using counters - typically the least reliable
65 The app time corresponds to the time tracked by an application after
69 audio time it wants reported by selecting the relevant settings in
72 measurement. Direct access to the link time is very interesting on
74 time with dedicated hardware, possibly synchronized with system time,
80 timestamp will report the DMA time based on the hw_pointer value.
85 streams and to the DMA time (hw_ptr) in all other cases.
90 - for dma time (default), the granularity of the transfers can be
95 - the link time can be used to track long-term drifts between audio
96 and system time using the (tstamp-trigger_tstamp)/audio_tstamp
98 filtering is required. The link time can be either reset on startup
102 hardware, the absolute link time could also be used to define a
103 precise start time (patches WIP)
123 at a time. This is a conscious design decision, reading the audio
124 timestamps from hardware registers or from IPC takes time, the more
145 playback: systime: 341121338 nsec, audio time 342000000 nsec, systime delta -878662
146 playback: systime: 426236663 nsec, audio time 427187500 nsec, systime delta -950837
147 playback: systime: 597080580 nsec, audio time 598000000 nsec, systime delta -919420
148 playback: systime: 682059782 nsec, audio time 683020833 nsec, systime delta -961051
149 playback: systime: 852896415 nsec, audio time 853854166 nsec, systime delta -957751
150 playback: systime: 937903344 nsec, audio time 938854166 nsec, systime delta -950822
154 playback: systime: 341053347 nsec, audio time 341062500 nsec, systime delta -9153
155 playback: systime: 426072447 nsec, audio time 426062500 nsec, systime delta 9947
156 playback: systime: 596899518 nsec, audio time 596895833 nsec, systime delta 3685
157 playback: systime: 681915317 nsec, audio time 681916666 nsec, systime delta -1349
158 playback: systime: 852741306 nsec, audio time 852750000 nsec, systime delta -8694
162 playback: systime: 341060004 nsec, audio time 341062791 nsec, systime delta -2787
163 playback: systime: 426242074 nsec, audio time 426244875 nsec, systime delta -2801
164 playback: systime: 597080992 nsec, audio time 597084583 nsec, systime delta -3591
165 playback: systime: 682084512 nsec, audio time 682088291 nsec, systime delta -3779
166 playback: systime: 852936229 nsec, audio time 852940916 nsec, systime delta -4687
167 playback: systime: 938107562 nsec, audio time 938112708 nsec, systime delta -5146
170 ahead of the actual playback time (as a side time this sort of
179 offset between audio time and system time due to buffering. Example 4
185 playback: systime: 120174019 nsec, audio time 125000000 nsec, systime delta -4825981
186 playback: systime: 245041136 nsec, audio time 250000000 nsec, systime delta -4958864
187 playback: systime: 370106088 nsec, audio time 375000000 nsec, systime delta -4893912
188 playback: systime: 495040065 nsec, audio time 500000000 nsec, systime delta -4959935
189 playback: systime: 620038179 nsec, audio time 625000000 nsec, systime delta -4961821
190 playback: systime: 745087741 nsec, audio time 750000000 nsec, systime delta -4912259
191 playback: systime: 870037336 nsec, audio time 875000000 nsec, systime delta -4962664
195 playback: systime: 120190520 nsec, audio time 120000000 nsec, systime delta 190520
196 playback: systime: 245036740 nsec, audio time 244000000 nsec, systime delta 1036740
197 playback: systime: 370034081 nsec, audio time 369000000 nsec, systime delta 1034081
198 playback: systime: 495159907 nsec, audio time 494000000 nsec, systime delta 1159907
199 playback: systime: 620098824 nsec, audio time 619000000 nsec, systime delta 1098824
200 playback: systime: 745031847 nsec, audio time 744000000 nsec, systime delta 1031847