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$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)
+{
+}
|
