Permit AudioRecord to support non-linear formats in future

    uint32_t channelCount = popcount(channelMask);

    mChannelCount = channelCount;

    // Assumes audio_is_linear_pcm(format), else sizeof(uint8_t)

    if (audio_is_linear_pcm(format)) {

        mFrameSize = channelCount * audio_bytes_per_sample(format);

    } else {

        mFrameSize = sizeof(uint8_t);

    }

    // validate framecount

    size_t minFrameCount = 0;