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OboeTester: Use shared stream for cold start latency test #2358

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OboeTester: Use shared stream for cold start latency test #2358

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d51743f
OboeTester: Use shared stream for cold start latency test
robertwu1 Mar 26, 2026
dcb1958
extend to all functions
robertwu1 Mar 26, 2026
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48 changes: 38 additions & 10 deletions apps/OboeTester/app/src/main/cpp/TestColdStartLatency.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -60,28 +60,34 @@ int32_t TestColdStartLatency::open(bool useInput, bool useLowLatency, bool useMm
}

int32_t TestColdStartLatency::start() {
std::shared_ptr<oboe::AudioStream> stream = mStream;
if (!stream) return (int32_t)Result::ErrorNull;
mBeginStartNanos = AudioClock::getNanoseconds();
Result result = mStream->requestStart();
Result result = stream->requestStart();
int64_t endStartNanos = AudioClock::getNanoseconds();
int64_t actualDurationNanos = endStartNanos - mBeginStartNanos;
mStartTimeMicros = actualDurationNanos / NANOS_PER_MICROSECOND;
return (int32_t) result;
}

int32_t TestColdStartLatency::close() {
if (!mStream) {
std::shared_ptr<oboe::AudioStream> stream = mStream;
if (!stream) {
return (int32_t)Result::OK;
}
Result result1 = mStream->requestStop();
Result result2 = mStream->close();
Result result1 = stream->requestStop();
Result result2 = stream->close();
return (int32_t)((result1 != Result::OK) ? result1 : result2);
}

int32_t TestColdStartLatency::getColdStartTimeMicros() {
std::shared_ptr<oboe::AudioStream> stream = mStream;
if (!stream) return -1;

int64_t position;
int64_t timestampNanos;
if (mStream->getDirection() == Direction::Output) {
auto result = mStream->getTimestamp(CLOCK_MONOTONIC);
if (stream->getDirection() == Direction::Output) {
auto result = stream->getTimestamp(CLOCK_MONOTONIC);
if (!result) {
return -1; // ERROR
}
Expand All @@ -90,10 +96,10 @@ int32_t TestColdStartLatency::getColdStartTimeMicros() {
position = frameTimestamp.position;
timestampNanos = frameTimestamp.timestamp;
} else {
position = mStream->getFramesRead();
position = stream->getFramesRead();
timestampNanos = AudioClock::getNanoseconds();
}
double sampleRate = (double) mStream->getSampleRate();
double sampleRate = (double) stream->getSampleRate();

int64_t elapsedNanos = NANOS_PER_SECOND * (position / sampleRate);
int64_t timeOfFrameZero = timestampNanos - elapsedNanos;
Expand All @@ -102,8 +108,30 @@ int32_t TestColdStartLatency::getColdStartTimeMicros() {
}

void TestColdStartLatency::waitForValidTimestamp() {
while (!mStream->getTimestamp(CLOCK_MONOTONIC)) {
usleep(kPollPeriodMillis * 1000);
std::shared_ptr<oboe::AudioStream> stream = mStream;
if (!stream) return;

int32_t timeoutCount = 0;
const int32_t kMaxTimeoutCount = 3000 / kPollPeriodMillis; // 3 seconds timeout

if (stream->getDirection() == Direction::Output) {
while (!stream->getTimestamp(CLOCK_MONOTONIC)) {
oboe::StreamState state = stream->getState();
if (state != oboe::StreamState::Starting && state != oboe::StreamState::Started) {
break;
}
usleep(kPollPeriodMillis * 1000);
if (++timeoutCount > kMaxTimeoutCount) break;
}
} else {
while (stream->getFramesRead() == 0) {
oboe::StreamState state = stream->getState();
if (state != oboe::StreamState::Starting && state != oboe::StreamState::Started) {
break;
}
usleep(kPollPeriodMillis * 1000);
if (++timeoutCount > kMaxTimeoutCount) break;
}
}
}

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