Fetch at least 192KB to avoid our mp3 sniffer from blocking on data.

                mLock.unlock();

                // Initially make sure we have at least 128 bytes for the sniff

                // Initially make sure we have at least 192 KB for the sniff

                // to complete without blocking.

                static const size_t kMinBytesForSniffing = 128;

                static const size_t kMinBytesForSniffing = 192 * 1024;

                off64_t metaDataSize = -1ll;

                for (;;) {