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mention the sound card clock and system clock difference in libpulse docs

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This commit is contained in:
Tanu Kaskinen 2017-10-19 21:22:15 +03:00
parent 7a7072557a
commit 50918e908b
2 changed files with 19 additions and 8 deletions
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19
src/pulse/def.h
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@ -641,8 +641,8 @@ typedef enum pa_subscription_event_type {
* pa_stream_update_timing_info() and pa_stream_get_timing_info(). The
* total output latency a sample that is written with
* pa_stream_write() takes to be played may be estimated by
* sink_usec+buffer_usec+transport_usec. (where buffer_usec is defined
* as pa_bytes_to_usec(write_index-read_index)) The output buffer
* sink_usec+buffer_usec+transport_usec (where buffer_usec is defined
* as pa_bytes_to_usec(write_index-read_index)). The output buffer
* which buffer_usec relates to may be manipulated freely (with
* pa_stream_write()'s seek argument, pa_stream_flush() and friends),
* the buffers sink_usec and source_usec relate to are first-in
@ -652,12 +652,19 @@ typedef enum pa_subscription_event_type {
* source_usec+buffer_usec+transport_usec-sink_usec. (Take care of
* sign issues!) When connected to a monitor source sink_usec contains
* the latency of the owning sink. The two latency estimations
* described here are implemented in pa_stream_get_latency(). Please
* note that this structure can be extended as part of evolutionary
* API updates at any time in any new release.*/
* described here are implemented in pa_stream_get_latency().
*
* All time values are in the sound card clock domain, unless noted
* otherwise. The sound card clock usually runs at a slightly different
* rate than the system clock.
*
* Please note that this structure can be extended as part of evolutionary
* API updates at any time in any new release.
* */
typedef struct pa_timing_info {
struct timeval timestamp;
/**< The time when this timing info structure was current */
/**< The system clock time when this timing info structure was
* current. */
int synchronized_clocks;
/**< Non-zero if the local and the remote machine have