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sink, source: Add a latency offset which is inherited from the port

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A latency offset variable was added to the sink/source struct.

Also a function was introduced to update the latency offset of the
sink/source and a new message type was introduced so we can send the latency
offset to the IO thread.

The latency offset is automatically populated with the latency from the
currently active port.
This commit is contained in:
poljar 2012-06-22 20:55:54 +02:00 • committed by Tanu Kaskinen
parent bc03487896
commit eebdda456b
5 changed files with 92 additions and 0 deletions
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9
src/pulsecore/source.h
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@ -113,6 +113,9 @@ struct pa_source {
pa_device_port *active_port;
pa_atomic_t mixer_dirty;
/* The latency offset is inherited from the currently active port */
pa_usec_t latency_offset;
unsigned priority;
/* Called when the main loop requests a state change. Called from
@ -209,6 +212,9 @@ struct pa_source {
pa_usec_t fixed_latency; /* for sources with PA_SOURCE_DYNAMIC_LATENCY this is 0 */
/* This latency offset is a direct copy from s->latency_offset */
pa_usec_t latency_offset;
/* Delayed volume change events are queued here. The events
* are stored in expiration order. The one expiring next is in
* the head of the list. */
@ -254,6 +260,7 @@ typedef enum pa_source_message {
PA_SOURCE_MESSAGE_SET_MAX_REWIND,
PA_SOURCE_MESSAGE_SET_PORT,
PA_SOURCE_MESSAGE_UPDATE_VOLUME_AND_MUTE,
PA_SOURCE_MESSAGE_SET_LATENCY_OFFSET,
PA_SOURCE_MESSAGE_MAX
} pa_source_message_t;
@ -335,6 +342,8 @@ void pa_source_update_flags(pa_source *s, pa_source_flags_t mask, pa_source_flag
/*** May be called by everyone, from main context */
void pa_source_set_latency_offset(pa_source *s, pa_usec_t offset);
/* The returned value is supposed to be in the time domain of the sound card! */
pa_usec_t pa_source_get_latency(pa_source *s);
pa_usec_t pa_source_get_requested_latency(pa_source *s);