Merge "TimestretchBufferProvider: getNextBuffer should follow API" into mnc-dev

    // need to fetch more data

    const size_t outputDesired = pBuffer->frameCount - mRemaining;

    size_t dstAvailable;

    do {

        mBuffer.frameCount = mPlaybackRate.mSpeed == AUDIO_TIMESTRETCH_SPEED_NORMAL

                ? outputDesired : outputDesired * mPlaybackRate.mSpeed + 1;

        ALOG_ASSERT(res == OK || mBuffer.frameCount == 0);

        if (res != OK || mBuffer.frameCount == 0) { // not needed by API spec, but to be safe.

        ALOGD("buffer error");

            ALOGV("upstream provider cannot provide data");

            if (mRemaining == 0) {

                pBuffer->raw = NULL;

                pBuffer->frameCount = 0;

        }

        // time-stretch the data

    size_t dstAvailable = min(mLocalBufferFrameCount - mRemaining, outputDesired);

        dstAvailable = min(mLocalBufferFrameCount - mRemaining, outputDesired);

        size_t srcAvailable = mBuffer.frameCount;

        processFrames((uint8_t*)mLocalBufferData + mRemaining * mFrameSize, &dstAvailable,

                mBuffer.raw, &srcAvailable);

        // release all data consumed

        mBuffer.frameCount = srcAvailable;

        mTrackBufferProvider->releaseBuffer(&mBuffer);

    } while (dstAvailable == 0); // try until we get output data or upstream provider fails.

    // update buffer vars with the actual data processed and return with buffer

    mRemaining += dstAvailable;