static void cacheOnceInit()
{
CCHelper tmpHelper;
status_t res;
if (OK != (res = tmpHelper.getLocalFreq(&cacheN))) {
ALOGE("Failed to fetch local time frequency when constructing a"
" MonoPipe (res = %d). getNextWriteTimestamp calls will be"
" non-functional", res);
return;
}
cacheValid = true;
}
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);
}
