- err = snd_pcm_hw_params_get_buffer_size (hw, &buffer_size);
- if (0 > err) {
- Sys_Printf ("ALSA: unable to get buffer size. %s\n",
+ // pick a buffer size that is a power of 2 (by masking off low bits)
+ buffer_size = i = (int)(requested->speed * 0.15f);
+ while (buffer_size & (buffer_size-1))
+ buffer_size &= (buffer_size-1);
+ // then check if it is the nearest power of 2 and bump it up if not
+ if (i - buffer_size >= buffer_size >> 1)
+ buffer_size *= 2;
+
+ err = snd_pcm_hw_params_set_buffer_size_near (pcm_handle, hw_params, &buffer_size);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set sound buffer size to %lu (%s)\n",
+ buffer_size, snd_strerror (err));
+ goto init_error;
+ }
+
+ // pick a period size near the buffer_size we got from ALSA
+ snd_pcm_hw_params_get_buffer_size (hw_params, &buffer_size);
+ buffer_size /= NB_PERIODS;
+ err = snd_pcm_hw_params_set_period_size_near(pcm_handle, hw_params, &buffer_size, 0);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set sound period size to %lu (%s)\n",
+ buffer_size, snd_strerror (err));
+ goto init_error;
+ }
+
+ err = snd_pcm_hw_params (pcm_handle, hw_params);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set hardware parameters (%s)\n",