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null-source: Add max_latency_msec argument

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It takes much time when starting to capture because max latency is set
to 2 seconds as a initial value. null-source latency need to be set a
lower value than initial value to improve latency.
This commit is contained in:
Jaechul Lee 2020-11-16 10:14:56 +09:00 • committed by Tanu Kaskinen
parent c1ac76014e
commit bd8ef73b91
1 changed files with 10 additions and 1 deletions
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11
src/modules/module-null-source.c
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@ -52,6 +52,7 @@ PA_MODULE_USAGE(
"rate=<sample rate> " "rate=<sample rate> "
"source_name=<name of source> " "source_name=<name of source> "
"channel_map=<channel map> " "channel_map=<channel map> "
"max_latency_msec=<maximum latency in ms> "
"description=<description for the source> "); "description=<description for the source> ");
#define DEFAULT_SOURCE_NAME "source.null" #define DEFAULT_SOURCE_NAME "source.null"
@ -79,6 +80,7 @@ static const char* const valid_modargs[] = {
"channels", "channels",
"source_name", "source_name",
"channel_map", "channel_map",
"max_latency_msec",
"description", "description",
NULL NULL
}; };
@ -123,6 +125,7 @@ static void source_update_requested_latency_cb(pa_source *s) {
pa_assert(u); pa_assert(u);
u->block_usec = pa_source_get_requested_latency_within_thread(s); u->block_usec = pa_source_get_requested_latency_within_thread(s);
if (u->block_usec == (pa_usec_t)-1) if (u->block_usec == (pa_usec_t)-1)
u->block_usec = u->source->thread_info.max_latency; u->block_usec = u->source->thread_info.max_latency;
} }
@ -197,6 +200,8 @@ int pa__init(pa_module*m) {
pa_channel_map map; pa_channel_map map;
pa_modargs *ma = NULL; pa_modargs *ma = NULL;
pa_source_new_data data; pa_source_new_data data;
pa_usec_t max_latency = MAX_LATENCY_USEC;
uint32_t max_latency_msec;
pa_assert(m); pa_assert(m);
@ -247,7 +252,11 @@ int pa__init(pa_module*m) {
pa_source_set_asyncmsgq(u->source, u->thread_mq.inq); pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
pa_source_set_rtpoll(u->source, u->rtpoll); pa_source_set_rtpoll(u->source, u->rtpoll);
pa_source_set_latency_range(u->source, MIN_LATENCY_USEC, MAX_LATENCY_USEC); if (pa_modargs_get_value_u32(ma, "max_latency_msec", &max_latency_msec))
max_latency = max_latency_msec * PA_USEC_PER_MSEC;
pa_source_set_latency_range(u->source, MIN_LATENCY_USEC, max_latency);
u->block_usec = u->source->thread_info.max_latency; u->block_usec = u->source->thread_info.max_latency;
u->source->thread_info.max_rewind = u->source->thread_info.max_rewind =