static int interleaved = 1;
 static int nonblock = 0;
 static char *audiobuf = NULL;
-static int chunk_size = -1;
-static int period_time = -1;
-static int buffer_time = -1;
+static snd_pcm_uframes_t chunk_size = 0;
+static unsigned period_time = 0;
+static unsigned buffer_time = 0;
 static int avail_min = -1;
 static int start_delay = 0;
 static int stop_delay = 0;
 {
        snd_pcm_hw_params_t *params;
        snd_pcm_sw_params_t *swparams;
-       size_t buffer_size;
+       snd_pcm_uframes_t buffer_size;
        int err;
        size_t n;
        size_t xfer_align;
        err = snd_pcm_hw_params_set_periods_min(handle, params, 2);
        assert(err >= 0);
 #endif
-       err = snd_pcm_hw_params_set_rate_near(handle, params, hwparams.rate, 0);
+       err = snd_pcm_hw_params_set_rate_near(handle, params, &hwparams.rate, 0);
        assert(err >= 0);
        rate = err;
-       if (buffer_time < 0)
+       if (buffer_time == 0)
                buffer_time = 500000;
-       buffer_time = snd_pcm_hw_params_set_buffer_time_near(handle, params,
-                                                            buffer_time, 0);
-       assert(buffer_time >= 0);
-       if (period_time < 0)
+       err = snd_pcm_hw_params_set_buffer_time_near(handle, params,
+                                                    &buffer_time, 0);
+       assert(err >= 0);
+       if (period_time == 0)
                period_time = buffer_time / 4;
-       period_time = snd_pcm_hw_params_set_period_time_near(handle, params,
-                                                            period_time, 0);
-       assert(period_time >= 0);
+       err = snd_pcm_hw_params_set_period_time_near(handle, params,
+                                                    &period_time, 0);
+       assert(err >= 0);
        err = snd_pcm_hw_params(handle, params);
        if (err < 0) {
                error("Unable to install hw params:");
                snd_pcm_hw_params_dump(params, log);
                exit(EXIT_FAILURE);
        }
-       chunk_size = snd_pcm_hw_params_get_period_size(params, 0);
-       buffer_size = snd_pcm_hw_params_get_buffer_size(params);
+       snd_pcm_hw_params_get_period_size(params, &chunk_size, 0);
+       snd_pcm_hw_params_get_buffer_size(params, &buffer_size);
        if (chunk_size == buffer_size) {
-               error("Can't use period equal to buffer size (%u == %lu)", chunk_size, (long)buffer_size);
+               error("Can't use period equal to buffer size (%lu == %lu)", chunk_size, buffer_size);
                exit(EXIT_FAILURE);
        }
        snd_pcm_sw_params_current(handle, swparams);