diff options
Diffstat (limited to 'media/libnbaio')
| -rw-r--r-- | media/libnbaio/MonoPipe.cpp | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/media/libnbaio/MonoPipe.cpp b/media/libnbaio/MonoPipe.cpp index 9c8461c..4adf018 100644 --- a/media/libnbaio/MonoPipe.cpp +++ b/media/libnbaio/MonoPipe.cpp @@ -30,6 +30,23 @@ namespace android { +static uint64_t cacheN; // output of CCHelper::getLocalFreq() +static bool cacheValid; // whether cacheN is valid +static pthread_once_t cacheOnceControl = PTHREAD_ONCE_INIT; + +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, const NBAIO_Format& format, bool writeCanBlock) : NBAIO_Sink(format), mUpdateSeq(0), @@ -47,8 +64,6 @@ MonoPipe::MonoPipe(size_t reqFrames, const NBAIO_Format& format, bool writeCanBl mTimestampMutator(&mTimestampShared), mTimestampObserver(&mTimestampShared) { - CCHelper tmpHelper; - status_t res; uint64_t N, D; mNextRdPTS = AudioBufferProvider::kInvalidPTS; @@ -59,12 +74,13 @@ MonoPipe::MonoPipe(size_t reqFrames, const NBAIO_Format& format, bool writeCanBl 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); + + (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); |