snd_pcm_t *recHnd = NULL;

void rec_init(char*dev) {
    snd_pcm_hw_params_t *prm = NULL;
    if (snd_pcm_open(&recHnd, dev, SND_PCM_STREAM_CAPTURE, 0) < 0) err("cannot open pcm device");
    snd_pcm_hw_params_alloca(&prm);
    snd_pcm_hw_params_any(recHnd, prm);
    if (snd_pcm_set_params(recHnd, SND_PCM_FORMAT_S16_LE, SND_PCM_ACCESS_RW_INTERLEAVED, 2, srate, 0, 1000) < 0) err("unable to set params");
    if (snd_pcm_hw_params_set_access(recHnd, prm, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) err("unable to set mode");
    if (snd_pcm_hw_params_set_format(recHnd, prm, SND_PCM_FORMAT_S16_LE) < 0) err("unable to set format");
    if (snd_pcm_hw_params_set_channels(recHnd, prm, 2) < 0) err("unable to set channel");
    if (snd_pcm_hw_params_set_rate(recHnd, prm, srate, 0) < 0) err("unable to set rate");
    if (snd_pcm_hw_params(recHnd, prm) < 0) err("cannot set parameters");
    if (snd_pcm_prepare(recHnd) < 0) err("cannot prepare");
}

void iou_read() {
    bufS = snd_pcm_readi(recHnd, &bufD[padln], pktln >> 2);
    if (bufS > 0) {
        bufS = bufS << 2;
        return;
    }
    bufS = snd_pcm_recover(recHnd, bufS, 1);
    if (bufS != 0) err("error reading");
    bufS = snd_pcm_readi(recHnd, &bufD[padln], pktln >> 2);
    bufS = bufS << 2;
}