Merge "RecordThread: Immediate retry on audio read overrun" into pi-dev am: 0f59472e

        if (mPipeSource != 0) {

            size_t framesToRead = mBufferSize / mFrameSize;

            framesToRead = min(mRsmpInFramesOA - rear, mRsmpInFramesP2 / 2);

            // The audio fifo read() returns OVERRUN on overflow, and advances the read pointer

            // to the full buffer point (clearing the overflow condition).  Upon OVERRUN error,

            // we immediately retry the read() to get data and prevent another overflow.

            for (int retries = 0; retries <= 2; ++retries) {

                ALOGW_IF(retries > 0, "overrun on read from pipe, retry #%d", retries);

                framesRead = mPipeSource->read((uint8_t*)mRsmpInBuffer + rear * mFrameSize,

                        framesToRead);

                if (framesRead != OVERRUN) break;

            }

            // since pipe is non-blocking, simulate blocking input by waiting for 1/2 of

            // buffer size or at least for 20ms.

            size_t sleepFrames = max(