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Merge "audio: Implement more accurate timing for the stub stream" into main

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This commit is contained in:
Treehugger Robot
2024-08-21 20:16:07 +00:00
committed by Gerrit Code Review
parent e2a71fb696 10fc96386e
commit 722afde62a
2 changed files with 20 additions and 8 deletions
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4
audio/aidl/default/include/core-impl/StreamStub.h
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@@ -44,6 +44,10 @@ class StreamStub : public StreamCommonImpl {
const bool mIsInput;
bool mIsInitialized = false; // Used for validating the state machine logic.
bool mIsStandby = true; // Used for validating the state machine logic.
// Used by the worker thread.
int64_t mStartTimeNs = 0;
long mFramesSinceStart = 0;
};
class StreamInStub final : public StreamIn, public StreamStub {

24
audio/aidl/default/stub/StreamStub.cpp
View File

@@ -83,7 +83,6 @@ StreamStub::~StreamStub() {
if (!mIsInitialized) {
LOG(FATAL) << __func__ << ": must not happen for an uninitialized driver";
}
usleep(500);
mIsStandby = true;
return ::android::OK;
}
@@ -92,8 +91,9 @@ StreamStub::~StreamStub() {
if (!mIsInitialized) {
LOG(FATAL) << __func__ << ": must not happen for an uninitialized driver";
}
usleep(500);
mIsStandby = false;
mStartTimeNs = ::android::uptimeNanos();
mFramesSinceStart = 0;
return ::android::OK;
}
@@ -105,14 +105,23 @@ StreamStub::~StreamStub() {
if (mIsStandby) {
LOG(FATAL) << __func__ << ": must not happen while in standby";
}
static constexpr float kMicrosPerSecond = MICROS_PER_SECOND;
static constexpr float kScaleFactor = .8f;
*actualFrameCount = frameCount;
if (mIsAsynchronous) {
usleep(500);
} else {
const size_t delayUs = static_cast<size_t>(
std::roundf(kScaleFactor * frameCount * kMicrosPerSecond / mSampleRate));
usleep(delayUs);
mFramesSinceStart += *actualFrameCount;
const long bufferDurationUs =
(*actualFrameCount) * MICROS_PER_SECOND / mContext.getSampleRate();
const auto totalDurationUs =
(::android::uptimeNanos() - mStartTimeNs) / NANOS_PER_MICROSECOND;
const long totalOffsetUs =
mFramesSinceStart * MICROS_PER_SECOND / mContext.getSampleRate() - totalDurationUs;
LOG(VERBOSE) << __func__ << ": totalOffsetUs " << totalOffsetUs;
if (totalOffsetUs > 0) {
const long sleepTimeUs = std::min(totalOffsetUs, bufferDurationUs);
LOG(VERBOSE) << __func__ << ": sleeping for " << sleepTimeUs << " us";
usleep(sleepTimeUs);
}
}
if (mIsInput) {
uint8_t* byteBuffer = static_cast<uint8_t*>(buffer);
@@ -120,7 +129,6 @@ StreamStub::~StreamStub() {
byteBuffer[i] = std::rand() % 255;
}
}
*actualFrameCount = frameCount;
return ::android::OK;
}