[mupen64plus-pandora.git] / source / mupen64plus-audio-sdl / src / volume.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *   Mupen64plus-sdl-audio - volume.c                                      *
 *   Mupen64Plus homepage: http://code.google.com/p/mupen64plus/           *
 *   Copyright (C) 2007-2008 Richard42 Ebenblues                           *
 *   Copyright (C) 2002 Hacktarux                                          *
 *                                                                         *
 *   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.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#if defined(HAS_OSS_SUPPORT)

/* Sound volume functions. */
#include <sys/soundcard.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h> /* close() */
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>

#include "volume.h"

/* volSet
 *  Sets volume of left and right PCM channels to given percentage (0-100) value.
 */
void volSet(int percent)
{
    int ret, vol;
    int mixerfd = open("/dev/mixer", O_RDONLY);

    if(mixerfd < 0)
    {
        perror("/dev/mixer");
        return;
    }

    if(percent > 100)
        percent = 100;
    else if(percent < 0)
        percent = 0;

    vol = (percent << 8) + percent; // set both left/right channels to same vol
    ret = ioctl(mixerfd, MIXER_WRITE(SOUND_MIXER_PCM), &vol);
    if(ret < 0)
        perror("Setting PCM volume");

    close(mixerfd);
}

/* volGet
 *  Returns volume of PCM channel as a percentage (0-100).
 *  Returns 0 on error.
 */
int volGet(void)
{
    int vol, ret;
    int mixerfd = open("/dev/mixer", O_RDONLY);

    if(mixerfd < 0)
    {
        perror("/dev/mixer");
        return 0;
    }

    ret = ioctl(mixerfd, MIXER_READ(SOUND_MIXER_PCM), &vol);
    if(ret < 0)
        perror("Reading PCM volume");

    close(mixerfd);

    return vol & 0xff; // just return the left channel
}

#endif /* defined(HAS_OSS_SUPPORT) */
Commit	Line	Data
852ee1c3	1	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	2	* Mupen64plus-sdl-audio - volume.c *
	3	* Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ *
	4	* Copyright (C) 2007-2008 Richard42 Ebenblues *
	5	* Copyright (C) 2002 Hacktarux *
	6	* *
	7	* This program is free software; you can redistribute it and/or modify *
	8	* it under the terms of the GNU General Public License as published by *
	9	* the Free Software Foundation; either version 2 of the License, or *
	10	* (at your option) any later version. *
	11	* *
	12	* This program is distributed in the hope that it will be useful, *
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
	15	* GNU General Public License for more details. *
	16	* *
	17	* You should have received a copy of the GNU General Public License *
	18	* along with this program; if not, write to the *
	19	* Free Software Foundation, Inc., *
	20	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
	21	* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
	22
	23	#if defined(HAS_OSS_SUPPORT)
	24
	25	/* Sound volume functions. */
	26	#include <sys/soundcard.h>
	27	#include <sys/types.h>
	28	#include <sys/stat.h>
	29	#include <sys/ioctl.h>
	30	#include <unistd.h> /* close() */
	31	#include <fcntl.h>
	32	#include <stdio.h>
	33	#include <errno.h>
	34
	35	#include "volume.h"
	36
	37	/* volSet
	38	* Sets volume of left and right PCM channels to given percentage (0-100) value.
	39	*/
	40	void volSet(int percent)
	41	{
	42	int ret, vol;
	43	int mixerfd = open("/dev/mixer", O_RDONLY);
	44
	45	if(mixerfd < 0)
	46	{
	47	perror("/dev/mixer");
	48	return;
	49	}
	50
	51	if(percent > 100)
	52	percent = 100;
	53	else if(percent < 0)
	54	percent = 0;
	55
	56	vol = (percent << 8) + percent; // set both left/right channels to same vol
	57	ret = ioctl(mixerfd, MIXER_WRITE(SOUND_MIXER_PCM), &vol);
	58	if(ret < 0)
	59	perror("Setting PCM volume");
	60
	61	close(mixerfd);
	62	}
	63
	64	/* volGet
65	* Returns volume of PCM channel as a percentage (0-100).
66	* Returns 0 on error.
67	*/
68	int volGet(void)
69	{
70	int vol, ret;
71	int mixerfd = open("/dev/mixer", O_RDONLY);
72
73	if(mixerfd < 0)
74	{
75	perror("/dev/mixer");
76	return 0;
77	}
78
79	ret = ioctl(mixerfd, MIXER_READ(SOUND_MIXER_PCM), &vol);
80	if(ret < 0)
81	perror("Reading PCM volume");
82
83	close(mixerfd);
84
85	return vol & 0xff; // just return the left channel
86	}
87
88	#endif /* defined(HAS_OSS_SUPPORT) */