Merge "RecordThread: Adjust sleep time to pipe frames free." into pi-dev

                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(

                    min(mPipeFramesP2, mRsmpInFramesP2) / 2, FMS_20 * mSampleRate / 1000);

            if (framesRead <= (ssize_t) sleepFrames) {

            const ssize_t availableToRead = mPipeSource->availableToRead();

            if (availableToRead >= 0) {

                // PipeSource is the master clock.  It is up to the AudioRecord client to keep up.

                LOG_ALWAYS_FATAL_IF((size_t)availableToRead > mPipeFramesP2,

                        "more frames to read than fifo size, %zd > %zu",

                        availableToRead, mPipeFramesP2);

                const size_t pipeFramesFree = mPipeFramesP2 - availableToRead;

                const size_t sleepFrames = min(pipeFramesFree, mRsmpInFramesP2) / 2;

                ALOGVV("mPipeFramesP2:%zu mRsmpInFramesP2:%zu sleepFrames:%zu availableToRead:%zd",

                        mPipeFramesP2, mRsmpInFramesP2, sleepFrames, availableToRead);

                sleepUs = (sleepFrames * 1000000LL) / mSampleRate;

            }

            if (framesRead < 0) {