$OpenBSD: patch-libmpcodecs_ad_pcm_c,v 1.2 2005/10/16 21:29:30 espie Exp $
--- libmpcodecs/ad_pcm.c.orig	Sun Feb 27 00:02:09 2005
+++ libmpcodecs/ad_pcm.c	Sun Oct 16 23:23:48 2005
@@ -20,6 +20,8 @@ LIBAD_EXTERN(pcm)
 static int init(sh_audio_t *sh_audio)
 {
   WAVEFORMATEX *h=sh_audio->wf;
+  if (!h)
+  	return 0;
   sh_audio->i_bps=h->nAvgBytesPerSec;
   sh_audio->channels=h->nChannels;
   sh_audio->samplerate=h->nSamplesPerSec;
@@ -96,8 +98,8 @@ static int control(sh_audio_t *sh,int cm
 
 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 {
-  int len=sh_audio->channels*sh_audio->samplesize-1;
-  len=(minlen+len)&(~len); // sample align
+  unsigned len = sh_audio->channels*sh_audio->samplesize;
+  len = maxlen - maxlen % len; // sample align
   len=demux_read_data(sh_audio->ds,buf,len);
   return len;
 }