void NuCachedSource2::updateCacheParamsFromSystemProperty() {
char value[PROPERTY_VALUE_MAX];
if (!property_get("media.stagefright.cache-params", value, NULL)) {
return;
}
updateCacheParamsFromString(value);
}
NuCachedSource2::NuCachedSource2(
const sp<DataSource> &source,
const char *cacheConfig,
bool disconnectAtHighwatermark)
: mSource(source),
mReflector(new AHandlerReflector<NuCachedSource2>(this)),
mLooper(new ALooper),
mCache(new PageCache(kPageSize)),
mCacheOffset(0),
mFinalStatus(OK),
mLastAccessPos(0),
mFetching(true),
mDisconnecting(false),
mLastFetchTimeUs(-1),
mNumRetriesLeft(kMaxNumRetries),
mHighwaterThresholdBytes(kDefaultHighWaterThreshold),
mLowwaterThresholdBytes(kDefaultLowWaterThreshold),
mKeepAliveIntervalUs(kDefaultKeepAliveIntervalUs),
mDisconnectAtHighwatermark(disconnectAtHighwatermark) {
// We are NOT going to support disconnect-at-highwatermark indefinitely
// and we are not guaranteeing support for client-specified cache
// parameters. Both of these are temporary measures to solve a specific
// problem that will be solved in a better way going forward.
updateCacheParamsFromSystemProperty();
if (cacheConfig != NULL) {
updateCacheParamsFromString(cacheConfig);
}
if (mDisconnectAtHighwatermark) {
// Makes no sense to disconnect and do keep-alives...
mKeepAliveIntervalUs = 0;
}
mLooper->setName("NuCachedSource2");
mLooper->registerHandler(mReflector);
// Since it may not be obvious why our looper thread needs to be
// able to call into java since it doesn't appear to do so at all...
// IMediaHTTPConnection may be (and most likely is) implemented in JAVA
// and a local JAVA IBinder will call directly into JNI methods.
// So whenever we call DataSource::readAt it may end up in a call to
// IMediaHTTPConnection::readAt and therefore call back into JAVA.
mLooper->start(false /* runOnCallingThread */, true /* canCallJava */);
}
NuCachedSource2::NuCachedSource2(
const sp<DataSource> &source,
const char *cacheConfig,
bool disconnectAtHighwatermark)
: mSource(source),
mReflector(new AHandlerReflector<NuCachedSource2>(this)),
mLooper(new ALooper),
mCache(new PageCache(kPageSize)),
mCacheOffset(0),
mFinalStatus(OK),
mLastAccessPos(0),
#ifdef OMAP_ENHANCEMENT
mMinAccessPos(0),
mMaxAccessPos(0),
#endif
mFetching(true),
mLastFetchTimeUs(-1),
mNumRetriesLeft(kMaxNumRetries),
mHighwaterThresholdBytes(kDefaultHighWaterThreshold),
mLowwaterThresholdBytes(kDefaultLowWaterThreshold),
mKeepAliveIntervalUs(kDefaultKeepAliveIntervalUs),
mDisconnectAtHighwatermark(disconnectAtHighwatermark) {
// We are NOT going to support disconnect-at-highwatermark indefinitely
// and we are not guaranteeing support for client-specified cache
// parameters. Both of these are temporary measures to solve a specific
// problem that will be solved in a better way going forward.
updateCacheParamsFromSystemProperty();
if (cacheConfig != NULL) {
updateCacheParamsFromString(cacheConfig);
}
if (mDisconnectAtHighwatermark) {
// Makes no sense to disconnect and do keep-alives...
mKeepAliveIntervalUs = 0;
}
mLooper->setName("NuCachedSource2");
mLooper->registerHandler(mReflector);
mLooper->start();
Mutex::Autolock autoLock(mLock);
(new AMessage(kWhatFetchMore, mReflector->id()))->post();
}
