From 78f8fce7f286fd0c71774e2567404ed51f24fef3 Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Fri, 26 May 2017 21:51:04 -0700 Subject: *: initial commit of stripped schism stuff Forking schism tracker's IT playback stuff into a little playback library for embedding in demos. --- src/sys/oss/volume-oss.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 src/sys/oss/volume-oss.c (limited to 'src/sys/oss/volume-oss.c') diff --git a/src/sys/oss/volume-oss.c b/src/sys/oss/volume-oss.c new file mode 100644 index 0000000..7771307 --- /dev/null +++ b/src/sys/oss/volume-oss.c @@ -0,0 +1,126 @@ +/* + * Schism Tracker - a cross-platform Impulse Tracker clone + * copyright (c) 2003-2005 Storlek + * copyright (c) 2005-2008 Mrs. Brisby + * copyright (c) 2009 Storlek & Mrs. Brisby + * copyright (c) 2010-2012 Storlek + * URL: http://schismtracker.org/ + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "headers.h" + +#include "util.h" +#include "log.h" + +#ifdef USE_OSS + +#include +#include +#include +#include + +#include +#include + +/* Hmm. I've found that some systems actually don't support the idea of a + * "master" volume, so this became necessary. I suppose PCM is really the + * more useful setting to change anyway. */ +#if 0 +# define SCHISM_MIXER_CONTROL SOUND_MIXER_VOLUME +#else +# define SCHISM_MIXER_CONTROL SOUND_MIXER_PCM +#endif + +#define VOLUME_MAX 100 + +/* --------------------------------------------------------------------- */ + +static const char *device_file = NULL; + +/* --------------------------------------------------------------------- */ + +static int open_mixer_device(void) +{ + const char *ptr; + + if (!device_file) { + ptr = "/dev/sound/mixer"; + if (access(ptr, F_OK) < 0) { + /* this had better work :) */ + ptr = "/dev/mixer"; + } + device_file = ptr; + } + + return open(device_file, O_RDWR); +} + +/* --------------------------------------------------------------------- */ + +int oss_volume_get_max(void); +int oss_volume_get_max(void) +{ + return VOLUME_MAX; +} + +void oss_volume_read(int *left, int *right); +void oss_volume_read(int *left, int *right) +{ + int fd; + uint8_t volume[4]; + + fd = open_mixer_device(); + if (fd < 0) { + log_perror(device_file); + *left = *right = 0; + return; + } + + if (ioctl(fd, MIXER_READ(SCHISM_MIXER_CONTROL), volume) == EOF) { + log_perror(device_file); + *left = *right = 0; + } else { + *left = volume[0]; + *right = volume[1]; + } + + close(fd); +} + +void oss_volume_write(int left, int right); +void oss_volume_write(int left, int right) +{ + int fd; + uint8_t volume[4]; + + volume[0] = CLAMP(left, 0, VOLUME_MAX); + volume[1] = CLAMP(right, 0, VOLUME_MAX); + + fd = open_mixer_device(); + if (fd < 0) { + log_perror(device_file); + return; + } + + if (ioctl(fd, MIXER_WRITE(SCHISM_MIXER_CONTROL), volume) == EOF) { + log_perror(device_file); + } + + close(fd); +} + +#endif -- cgit v1.2.3