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[client] audio: handle USB transport backpressure

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This commit is contained in:
Geoffrey McRae
2026-08-12 14:36:50 +10:00
parent 573204d44e
commit 173316a5a9
5 changed files with 67 additions and 18 deletions
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33
client/src/usb_audio.c
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@@ -381,6 +381,7 @@ struct LG_USBAudio
uint64_t feedbackNextPacketTime;
uint32_t feedbackQueueTarget;
atomic_uint feedbackValue;
bool outputBackpressured;
atomic_bool recordStreaming;
atomic_bool recordAccepting;
@@ -924,6 +925,7 @@ static void resetDevice(LG_USBAudio * audio)
audio->playbackSampleRate = LG_USB_AUDIO_DEFAULT_SAMPLE_RATE;
audio->recordBatchPackets = 1;
audio->recordSafetyPackets = 1;
audio->outputBackpressured = false;
atomic_store_explicit(&audio->recordSampleRate,
LG_USB_AUDIO_DEFAULT_SAMPLE_RATE, memory_order_relaxed);
atomic_store_explicit(&audio->recordRateQ16,
@@ -1220,7 +1222,7 @@ static void sendRecordPacketBatch(LG_USBAudio * audio, uint32_t count,
static void sendRecordRefill(LG_USBAudio * audio, uint64_t rateQ16)
{
const uint32_t count = min(
audio->recordRefillPackets, USB_AUDIO_RECORD_MAX_BATCH);
audio->recordRefillPackets, audio->recordBatchPackets);
sendRecordPacketBatch(audio, count, rateQ16, true, 0, 0);
audio->recordRefillPackets -= count;
if (!audio->recordRefillPackets)
@@ -1277,7 +1279,7 @@ static void sendRecordPackets(LG_USBAudio * audio)
}
const uint32_t sendCount = (uint32_t)min(
count, (uint64_t)USB_AUDIO_RECORD_MAX_BATCH);
count, (uint64_t)audio->recordBatchPackets);
const uint64_t catchupFrames =
(audio->recordPacketPhase + rateQ16 * count) /
USB_AUDIO_RECORD_RATE_DENOMINATOR;
@@ -1823,12 +1825,30 @@ static void reportPlaybackDebug(LG_USBAudio * audio)
audio->playbackInvalidPackets = 0;
}
static void processDevice(void * opaque)
static void processDevice(void * opaque, bool writable)
{
LG_USBAudio * audio = opaque;
sendFeedbackPacketsDue(audio);
const uint64_t now = streamTime();
if (!writable)
{
if (atomic_load_explicit(
&audio->recordStreaming, memory_order_acquire))
audio->recordNextPacketTime =
now + USB_AUDIO_RECORD_PACKET_INTERVAL_NS;
audio->outputBackpressured = true;
}
else if (audio->outputBackpressured)
{
audio->recordNextPacketTime =
now + USB_AUDIO_RECORD_PACKET_INTERVAL_NS;
audio->outputBackpressured = false;
}
if (writable)
sendFeedbackPacketsDue(audio);
flushPlayback(audio);
sendRecordPackets(audio);
if (writable)
sendRecordPackets(audio);
reportPlaybackDebug(audio);
reportRecordDebug(audio);
}
@@ -1986,6 +2006,9 @@ uint64_t lgUsbAudio_processDelayNs(const LG_USBAudio * audio)
if (!audio)
return UINT64_MAX;
if (audio->outputBackpressured)
return UINT64_MAX;
const uint64_t now = streamTime();
uint64_t delay = UINT64_MAX;