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[client] audio: reduce LGMP stream latency

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Poll active audio streams every 25 to 250 microseconds and reset the
adaptive delay whenever records arrive.
This commit is contained in:
Geoffrey McRae
2026-09-02 03:56:42 +10:00
parent 405233bfb9
commit 2fa376b31b
1 changed files with 6 additions and 4 deletions
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10
client/transports/LGMP/audio.c
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@@ -37,7 +37,7 @@
#include <sys/random.h> #include <sys/random.h>
#define AUDIO_IDLE_POLL_MS 20U #define AUDIO_IDLE_POLL_MS 20U
#define AUDIO_ACTIVE_POLL_MS 2U #define AUDIO_ACTIVE_POLL_US 250U
#define AUDIO_CLAIM_RETRY_US 200000U #define AUDIO_CLAIM_RETRY_US 200000U
#define AUDIO_OWNER_RETRY_US 1200000U #define AUDIO_OWNER_RETRY_US 1200000U
#define AUDIO_DRAIN_MAX 32U #define AUDIO_DRAIN_MAX 32U
@@ -1740,9 +1740,9 @@ static int audioThread(void * opaque)
LGMPAudio * audio = opaque; LGMPAudio * audio = opaque;
const struct LGMPStreamPollConfig pollConfig = const struct LGMPStreamPollConfig pollConfig =
{ {
.spinCount = 32, .spinCount = 64,
.minWaitUs = 100, .minWaitUs = 25,
.maxWaitUs = AUDIO_ACTIVE_POLL_MS * 1000U, .maxWaitUs = AUDIO_ACTIVE_POLL_US,
}; };
if (lgmpStreamPollInit(&audio->streamPoll, pollConfig) != LGMP_OK) if (lgmpStreamPollInit(&audio->streamPoll, pollConfig) != LGMP_OK)
return -1; return -1;
@@ -1751,6 +1751,8 @@ static int audioThread(void * opaque)
{ {
processResponse(audio); processResponse(audio);
const unsigned drained = drainInbound(audio); const unsigned drained = drainInbound(audio);
if (drained)
lgmpStreamPollActivity(&audio->streamPoll);
maintainBinding(audio); maintainBinding(audio);
if (atomic_exchange_explicit( if (atomic_exchange_explicit(
&audio->dataPlaneLost, false, memory_order_acq_rel)) &audio->dataPlaneLost, false, memory_order_acq_rel))