Merge "Use float_from_q19_12 conversion in AudioMixer"

        switch (t.mSinkFormat) {

        case AUDIO_FORMAT_PCM_FLOAT: {

            float *fout = reinterpret_cast<float*>(out);

            static float scale = 1. / (32768. * 4096.); // exact when inverted

            do {

                uint32_t rl = *reinterpret_cast<const uint32_t *>(in);

                in += 2;

                int32_t l = mulRL(1, rl, vrl);

                int32_t r = mulRL(0, rl, vrl);

                *fout++ = static_cast<float>(l) * scale;

                *fout++ = static_cast<float>(r) * scale;

                *fout++ = float_from_q19_12(l);

                *fout++ = float_from_q19_12(r);

                // Note: In case of later int16_t sink output,

                // conversion and clamping is done by memcpy_to_i16_from_float().

            } while (--outFrames);

            } break;

        case AUDIO_FORMAT_PCM_16_BIT: