home *** CD-ROM | disk | FTP | other *** search
- /*
-
- TiMidity -- Experimental MIDI to WAVE converter
- Copyright (C) 1995 Tuukka Toivonen <titoivon@snakemail.hut.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.
-
- sun_audio.c
-
- Functions to play sound on a Sun's /dev/audio.
-
- 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 <sun/audioio.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 sun_play_mode
-
- PlayMode dpm = {
- DEFAULT_RATE, PE_16BIT|PE_SIGNED,
- -1,
- {}, /* no extra parameters so far */
- "Sun audio device", 'd',
- "/dev/audio",
- open_output,
- close_output,
- output_data,
- flush_output,
- purge_output
- };
-
- /*************************************************************************/
- /*
- 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 audio_info_t auinfo;
-
- static int open_output(void)
- {
- int fd, tmp, i, warnings=0;
-
- /* Open the audio device */
- fd=open(dpm.name, O_RDWR | O_NDELAY);
- if (fd<0)
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s",
- dpm.name, sys_errlist[errno]);
- return -1;
- }
-
-
- /* Does any device need byte-swapped data? Turn the bit off here. */
- dpm.encoding &= ~PE_BYTESWAP;
-
-
- AUDIO_INITINFO(&auinfo);
-
- if (ioctl(fd, AUDIO_GETINFO, &auinfo)<0)
- {
- /* If it doesn't give info, it probably won't take requests
- either. Assume it's an old device that does 8kHz uLaw only.
-
- Disclaimer: I don't know squat about the various Sun audio
- devices, so if this is not what we should do, I'll gladly
- accept modifications. */
-
- ctl->cmsg(CMSG_WARNING, VERB_NORMAL, "Cannot inquire %s", dpm.name);
-
- dpm.encoding = PE_ULAW|PE_MONO;
- dpm.rate = 8000;
- warnings=1;
- }
- else
- {
- ctl->cmsg(CMSG_INFO,VERB_DEBUG,
- "1. precision=%d channels=%d encoding=%d sample_rate=%d",
- auinfo.play.precision, auinfo.play.channels,
- auinfo.play.encoding, auinfo.play.sample_rate);
- 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 */
-
- if (dpm.encoding & PE_ULAW)
- {
- auinfo.play.precision = 8;
- auinfo.play.encoding = AUDIO_ENCODING_ULAW;
- }
- else
- {
- auinfo.play.precision = 16;
- auinfo.play.encoding = AUDIO_ENCODING_LINEAR;
- }
- if (ioctl(fd, AUDIO_SETINFO, &auinfo)<0)
- {
- /* Try the other one instead */
- if (dpm.encoding & PE_ULAW)
- {
- auinfo.play.precision = 16;
- auinfo.play.encoding = AUDIO_ENCODING_LINEAR;
- }
- else
- {
- auinfo.play.precision = 8;
- auinfo.play.encoding = AUDIO_ENCODING_ULAW;
- }
- if (ioctl(fd, AUDIO_SETINFO, &auinfo)<0)
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "%s doesn't support 16-bit linear or 8-bit uLaw samples",
- dpm.name);
- close(fd);
- return -1;
- }
- dpm.encoding ^= PE_ULAW;
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE, "Encoding adjusted to %s",
- (dpm.encoding & PE_ULAW) ? "uLaw" : "16-bit linear");
- warnings=1;
- }
- /* Set the other bits right. */
- if (dpm.encoding & PE_ULAW)
- dpm.encoding &= ~(PE_16BIT|PE_SIGNED);
- else
- dpm.encoding |= PE_16BIT|PE_SIGNED;
-
-
- /* Select stereo or mono samples */
-
- auinfo.play.channels = (dpm.encoding & PE_MONO) ? 1 : 2;
- if (ioctl(fd, AUDIO_SETINFO,&auinfo)<0)
- {
- auinfo.play.channels = (dpm.encoding & PE_MONO) ? 2 : 1;
- if ((dpm.encoding & PE_MONO) ||
- (ioctl(fd, AUDIO_SETINFO,&auinfo)<0))
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "%s doesn't support mono or stereo samples", dpm.name);
- close(fd);
- return -1;
- }
- dpm.encoding ^= PE_MONO;
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE, "Sound adjusted to %sphonic",
- (dpm.encoding & PE_MONO) ? "mono" : "stereo");
- warnings=1;
- }
-
-
- /* Select sampling rate */
-
- auinfo.play.sample_rate=dpm.rate;
- if (ioctl(fd, AUDIO_SETINFO,&auinfo)<0)
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "%s doesn't support a %d Hz sample rate",
- dpm.name, dpm.rate);
- close(fd);
- return -1;
- }
- /* This may be pointless -- do the Sun devices give an error if
- the sampling rate can't be produced exactly? */
- if (auinfo.play.sample_rate != dpm.rate)
- {
- dpm.rate=auinfo.play.sample_rate;
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
- "Output rate adjusted to %d Hz", dpm.rate);
- warnings=1;
- }
-
-
- ctl->cmsg(CMSG_INFO,VERB_DEBUG,
- "2. precision=%d channels=%d encoding=%d sample_rate=%d",
- auinfo.play.precision, auinfo.play.channels,
- auinfo.play.encoding, auinfo.play.sample_rate);
- ctl->cmsg(CMSG_INFO,VERB_DEBUG,
- "2. (dpm.encoding=0x%02x dpm.rate=%d)",
- dpm.encoding, dpm.rate);
- }
-
- dpm.fd=fd;
-
- return warnings;
- }
-
- static void output_data(int32 *buf, int32 count)
- {
- if (!(dpm.encoding & PE_MONO)) count*=2; /* Stereo samples */
-
- if (dpm.encoding & PE_ULAW)
- {
- /* Convert to 8-bit uLaw and write out. */
- s32toulaw(buf, NULL, count);
-
- while ((-1==write(dpm.fd, buf, count)) && errno==EINTR)
- ;
- }
- else
- {
- /* Convert data to signed 16-bit PCM */
- s32tos16(buf, NULL, count);
-
- while ((-1==write(dpm.fd, buf, count * 2)) && errno==EINTR)
- ;
- }
- }
-
- static void close_output(void)
- {
- close(dpm.fd);
- }
-
- static void flush_output(void)
- {
- }
-
- static void purge_output(void)
- {
- }
-