MonoPipe::MonoPipe(size_t reqFrames, const NBAIO_Format& format, bool writeCanBlock) :
NBAIO_Sink(format),
mUpdateSeq(0),
mReqFrames(reqFrames),
mMaxFrames(roundup(reqFrames)),
mBuffer(malloc(mMaxFrames * Format_frameSize(format))),
mFront(0),
mRear(0),
mWriteTsValid(false),
// mWriteTs
mSetpoint((reqFrames * 11) / 16),
mWriteCanBlock(writeCanBlock),
mIsShutdown(false),
// mTimestampShared
mTimestampMutator(&mTimestampShared),
mTimestampObserver(&mTimestampShared)
{
uint64_t N, D;
mNextRdPTS = AudioBufferProvider::kInvalidPTS;
mSamplesToLocalTime.a_zero = 0;
mSamplesToLocalTime.b_zero = 0;
mSamplesToLocalTime.a_to_b_numer = 0;
mSamplesToLocalTime.a_to_b_denom = 0;
D = Format_sampleRate(format);
(void) pthread_once(&cacheOnceControl, cacheOnceInit);
if (!cacheValid) {
// log has already been done
return;
}
N = cacheN;
LinearTransform::reduce(&N, &D);
static const uint64_t kSignedHiBitsMask = ~(0x7FFFFFFFull);
static const uint64_t kUnsignedHiBitsMask = ~(0xFFFFFFFFull);
if ((N & kSignedHiBitsMask) || (D & kUnsignedHiBitsMask)) {
ALOGE("Cannot reduce sample rate to local clock frequency ratio to fit"
" in a 32/32 bit rational. (max reduction is 0x%016" PRIx64 "/0x%016" PRIx64
"). getNextWriteTimestamp calls will be non-functional", N, D);
return;
}
mSamplesToLocalTime.a_to_b_numer = static_cast<int32_t>(N);
mSamplesToLocalTime.a_to_b_denom = static_cast<uint32_t>(D);
}
MonoPipe::MonoPipe(size_t reqFrames, NBAIO_Format format, bool writeCanBlock) :
NBAIO_Sink(format),
mUpdateSeq(0),
mReqFrames(reqFrames),
mMaxFrames(roundup(reqFrames)),
mBuffer(malloc(mMaxFrames * Format_frameSize(format))),
mFront(0),
mRear(0),
mWriteTsValid(false),
// mWriteTs
mSetpoint((reqFrames * 11) / 16),
mWriteCanBlock(writeCanBlock),
mIsShutdown(false)
{
CCHelper tmpHelper;
status_t res;
uint64_t N, D;
mNextRdPTS = AudioBufferProvider::kInvalidPTS;
mSamplesToLocalTime.a_zero = 0;
mSamplesToLocalTime.b_zero = 0;
mSamplesToLocalTime.a_to_b_numer = 0;
mSamplesToLocalTime.a_to_b_denom = 0;
D = Format_sampleRate(format);
if (OK != (res = tmpHelper.getLocalFreq(&N))) {
ALOGE("Failed to fetch local time frequency when constructing a"
" MonoPipe (res = %d). getNextWriteTimestamp calls will be"
" non-functional", res);
return;
}
LinearTransform::reduce(&N, &D);
static const uint64_t kSignedHiBitsMask = ~(0x7FFFFFFFull);
static const uint64_t kUnsignedHiBitsMask = ~(0xFFFFFFFFull);
if ((N & kSignedHiBitsMask) || (D & kUnsignedHiBitsMask)) {
ALOGE("Cannot reduce sample rate to local clock frequency ratio to fit"
" in a 32/32 bit rational. (max reduction is 0x%016llx/0x%016llx"
"). getNextWriteTimestamp calls will be non-functional", N, D);
return;
}
mSamplesToLocalTime.a_to_b_numer = static_cast<int32_t>(N);
mSamplesToLocalTime.a_to_b_denom = static_cast<uint32_t>(D);
}
ssize_t MonoPipe::write(const void *buffer, size_t count)
{
if (CC_UNLIKELY(!mNegotiated)) {
return NEGOTIATE;
}
size_t totalFramesWritten = 0;
while (count > 0) {
// can't return a negative value, as we already checked for !mNegotiated
size_t avail = availableToWrite();
size_t written = avail;
if (CC_LIKELY(written > count)) {
written = count;
}
size_t rear = mRear & (mMaxFrames - 1);
size_t part1 = mMaxFrames - rear;
if (part1 > written) {
part1 = written;
}
if (CC_LIKELY(part1 > 0)) {
memcpy((char *) mBuffer + (rear << mBitShift), buffer, part1 << mBitShift);
if (CC_UNLIKELY(rear + part1 == mMaxFrames)) {
size_t part2 = written - part1;
if (CC_LIKELY(part2 > 0)) {
memcpy(mBuffer, (char *) buffer + (part1 << mBitShift), part2 << mBitShift);
}
}
android_atomic_release_store(written + mRear, &mRear);
totalFramesWritten += written;
}
if (!mWriteCanBlock || mIsShutdown) {
break;
}
count -= written;
buffer = (char *) buffer + (written << mBitShift);
// Simulate blocking I/O by sleeping at different rates, depending on a throttle.
// The throttle tries to keep the mean pipe depth near the setpoint, with a slight jitter.
uint32_t ns;
if (written > 0) {
size_t filled = (mMaxFrames - avail) + written;
// FIXME cache these values to avoid re-computation
if (filled <= mSetpoint / 2) {
// pipe is (nearly) empty, fill quickly
ns = written * ( 500000000 / Format_sampleRate(mFormat));
} else if (filled <= (mSetpoint * 3) / 4) {
// pipe is below setpoint, fill at slightly faster rate
ns = written * ( 750000000 / Format_sampleRate(mFormat));
} else if (filled <= (mSetpoint * 5) / 4) {
// pipe is at setpoint, fill at nominal rate
ns = written * (1000000000 / Format_sampleRate(mFormat));
} else if (filled <= (mSetpoint * 3) / 2) {
// pipe is above setpoint, fill at slightly slower rate
ns = written * (1150000000 / Format_sampleRate(mFormat));
} else if (filled <= (mSetpoint * 7) / 4) {
// pipe is overflowing, fill slowly
ns = written * (1350000000 / Format_sampleRate(mFormat));
} else {
// pipe is severely overflowing
ns = written * (1750000000 / Format_sampleRate(mFormat));
}
} else {
ns = count * (1350000000 / Format_sampleRate(mFormat));
}
if (ns > 999999999) {
ns = 999999999;
}
struct timespec nowTs;
bool nowTsValid = !clock_gettime(CLOCK_MONOTONIC, &nowTs);
// deduct the elapsed time since previous write() completed
if (nowTsValid && mWriteTsValid) {
time_t sec = nowTs.tv_sec - mWriteTs.tv_sec;
long nsec = nowTs.tv_nsec - mWriteTs.tv_nsec;
ALOGE_IF(sec < 0 || (sec == 0 && nsec < 0),
"clock_gettime(CLOCK_MONOTONIC) failed: was %ld.%09ld but now %ld.%09ld",
mWriteTs.tv_sec, mWriteTs.tv_nsec, nowTs.tv_sec, nowTs.tv_nsec);
if (nsec < 0) {
--sec;
nsec += 1000000000;
}
if (sec == 0) {
if ((long) ns > nsec) {
ns -= nsec;
} else {
ns = 0;
}
}
}
if (ns > 0) {
const struct timespec req = {0, ns};
nanosleep(&req, NULL);
}
// record the time that this write() completed
if (nowTsValid) {
mWriteTs = nowTs;
if ((mWriteTs.tv_nsec += ns) >= 1000000000) {
mWriteTs.tv_nsec -= 1000000000;
++mWriteTs.tv_sec;
}
}
mWriteTsValid = nowTsValid;
}
mFramesWritten += totalFramesWritten;
return totalFramesWritten;
}
void FastCapture::onStateChange()
{
const FastCaptureState * const current = (const FastCaptureState *) mCurrent;
const FastCaptureState * const previous = (const FastCaptureState *) mPrevious;
FastCaptureDumpState * const dumpState = (FastCaptureDumpState *) mDumpState;
const size_t frameCount = current->mFrameCount;
bool eitherChanged = false;
// check for change in input HAL configuration
NBAIO_Format previousFormat = mFormat;
if (current->mInputSourceGen != mInputSourceGen) {
mInputSource = current->mInputSource;
mInputSourceGen = current->mInputSourceGen;
if (mInputSource == NULL) {
mFormat = Format_Invalid;
mSampleRate = 0;
} else {
mFormat = mInputSource->format();
mSampleRate = Format_sampleRate(mFormat);
unsigned channelCount = Format_channelCount(mFormat);
ALOG_ASSERT(channelCount >= 1 && channelCount <= FCC_8);
}
dumpState->mSampleRate = mSampleRate;
eitherChanged = true;
}
// check for change in pipe
if (current->mPipeSinkGen != mPipeSinkGen) {
mPipeSink = current->mPipeSink;
mPipeSinkGen = current->mPipeSinkGen;
eitherChanged = true;
}
// input source and pipe sink must be compatible
if (eitherChanged && mInputSource != NULL && mPipeSink != NULL) {
ALOG_ASSERT(Format_isEqual(mFormat, mPipeSink->format()));
}
if ((!Format_isEqual(mFormat, previousFormat)) || (frameCount != previous->mFrameCount)) {
// FIXME to avoid priority inversion, don't free here
free(mReadBuffer);
mReadBuffer = NULL;
if (frameCount > 0 && mSampleRate > 0) {
// FIXME new may block for unbounded time at internal mutex of the heap
// implementation; it would be better to have normal capture thread allocate for
// us to avoid blocking here and to prevent possible priority inversion
size_t bufferSize = frameCount * Format_frameSize(mFormat);
(void)posix_memalign(&mReadBuffer, 32, bufferSize);
memset(mReadBuffer, 0, bufferSize); // if posix_memalign fails, will segv here.
mPeriodNs = (frameCount * 1000000000LL) / mSampleRate; // 1.00
mUnderrunNs = (frameCount * 1750000000LL) / mSampleRate; // 1.75
mOverrunNs = (frameCount * 500000000LL) / mSampleRate; // 0.50
mForceNs = (frameCount * 950000000LL) / mSampleRate; // 0.95
mWarmupNsMin = (frameCount * 750000000LL) / mSampleRate; // 0.75
mWarmupNsMax = (frameCount * 1250000000LL) / mSampleRate; // 1.25
} else {
mPeriodNs = 0;
mUnderrunNs = 0;
mOverrunNs = 0;
mForceNs = 0;
mWarmupNsMin = 0;
mWarmupNsMax = LONG_MAX;
}
mReadBufferState = -1;
dumpState->mFrameCount = frameCount;
}
}
