$NetBSD: patch-bd,v 1.2 1998/08/07 10:36:16 agc Exp $

--- /dev/null	Sat Mar  7 13:11:05 1998
+++ sgi_a.c	Sat Mar  7 13:30:25 1998
@@ -0,0 +1,161 @@
+/* 
+
+    TiMidity -- Experimental MIDI to WAVE converter
+    Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    sgi_audio.c
+
+    Functions to play sound on a SGI's audio device.
+
+    THESE ARE UNTESTED -- If you need to make modifications to get
+    them to work, please send me the diffs, preferrably with a brief 
+    explanation of what was wrong. Thanks!
+
+*/
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <sys/ioctl.h> 
+
+#include <audio.h>
+
+#include "config.h"
+#include "output.h"
+#include "controls.h"
+
+static int open_output(void); /* 0=success, 1=warning, -1=fatal error */
+static void close_output(void);
+static void output_data(int32 *buf, int32 count);
+static void flush_output(void);
+static void purge_output(void);
+
+/* export the playback mode */
+
+#define dpm sgi_play_mode
+
+PlayMode dpm = {
+  DEFAULT_RATE, PE_16BIT|PE_SIGNED,
+  -1,
+  {0,0,0,0,0}, /* no extra parameters so far */
+  "SGI audio device", 'd',
+  NULL,
+  open_output,
+  close_output,
+  output_data,
+  flush_output,
+  purge_output  
+};
+
+static ALport port;
+static ALconfig config;
+
+/*************************************************************************/
+/*
+   Encoding will be 16-bit linear signed, unless PE_ULAW is set, in
+   which case it'll be 8-bit uLaw. I don't think it's worthwhile to
+   implement any 8-bit linear modes as the sound quality is
+   unrewarding. PE_MONO is honored.  */
+
+static int open_output(void)
+{
+  int warnings=0;
+  long params[2];
+  
+  /* Open the audio device */
+
+  config = ALnewconfig();
+
+  /* Does any device need byte-swapped data? Turn the bit off here. */
+  dpm.encoding &= ~PE_BYTESWAP;
+
+  ctl->cmsg(CMSG_INFO,VERB_DEBUG, 
+	    "1. (dpm.encoding=0x%02x  dpm.rate=%d)",
+	    dpm.encoding, dpm.rate);
+
+  /* Select 16-bit linear / 8-bit uLaw encoding */
+
+  dpm.encoding &= ~PE_ULAW;
+  dpm.encoding |= PE_16BIT|PE_SIGNED;
+  ALsetwidth(config, AL_SAMPLE_16);
+  ALsetsampfmt(config, AL_SAMPFMT_TWOSCOMP);
+
+  if (dpm.encoding & PE_MONO)
+    ALsetchannels(config, AL_MONO);
+  else
+    ALsetchannels(config, AL_STEREO);
+
+  ALsetqueuesize(config, 32768);
+
+  port = ALopenport("tiMIDIty audio", "w", config);
+
+  if (port == 0)
+    {
+      ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
+		"Can't open audio port");
+      return -1;
+    }
+
+  params[0] = AL_OUTPUT_RATE;
+  params[1] = dpm.rate;
+  ALsetparams(AL_DEFAULT_DEVICE, params, 2);
+  ALgetparams(AL_DEFAULT_DEVICE, params, 2);
+
+  if (dpm.rate != params[1])
+    {
+      dpm.rate = params[1];
+      ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
+		"Output rate adjusted to %d Hz", dpm.rate);
+      warnings=1;
+    }
+
+  ctl->cmsg(CMSG_INFO,VERB_DEBUG, 
+	    "1. (dpm.encoding=0x%02x  dpm.rate=%d)",
+	    dpm.encoding, dpm.rate);
+
+  return warnings;
+}
+
+static void output_data(int32 *buf, int32 count)
+{
+  /* Convert data to signed 16-bit PCM */
+  if (dpm.encoding & PE_MONO)
+    {
+      s32tos16(buf, count);
+      ALwritesamps(port, buf, count);
+    }
+  else
+    {
+      s32tos16(buf, count * 2);
+      ALwritesamps(port, buf, count * 2);
+    }
+}
+
+static void close_output(void)
+{
+  ALcloseport(port);
+  ALfreeconfig(config);
+}
+
+static void flush_output(void)
+{
+}
+
+static void purge_output(void)
+{
+}