130 lines
3 KiB
C
130 lines
3 KiB
C
/* WMix 3.0 -- a mixer using the OSS mixer API.
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* Copyright (C) 2000, 2001
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* Daniel Richard G. <skunk@mit.edu>,
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* timecop <timecop@japan.co.jp>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include "include/common.h"
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#include "include/misc.h"
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typedef struct {
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int enable;
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int x;
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int y;
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int width;
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int height;
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} MRegion;
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MRegion mr[16];
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/* Converts separate left and right channel volumes (each in [0, 1]) to
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* volume and balance values. (Volume is in [0, 1], balance is in [-1, 1])
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*/
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void lr_to_vb(float left, float right, float *volume, float *balance)
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{
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assert((left >= 0.0) && (right >= 0.0));
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*volume = MAX(left, right);
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if (left > right)
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*balance = -1.0 + right / left;
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else if (right > left)
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*balance = 1.0 - left / right;
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else
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*balance = 0.0;
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}
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/* Performs the reverse calculation of lr_to_vb()
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*/
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void vb_to_lr(float volume, float balance, float *left, float *right)
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{
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/* *left = volume; *right = volume; return; // XXX */
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*left = volume * (1.0 - MAX(0.0, balance));
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*right = volume * (1.0 + MIN(0.0, balance));
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}
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double get_current_time(void)
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{
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struct timeval tv;
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double t;
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gettimeofday(&tv, NULL);
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t = (double)tv.tv_sec;
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t += (double)tv.tv_usec / 1.0e6;
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return t;
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}
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void add_region(int index, int x, int y, int width, int height)
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{
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mr[index].enable = 1;
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mr[index].x = x;
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mr[index].y = y;
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mr[index].width = width;
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mr[index].height = height;
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}
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int check_region(int x, int y)
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{
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register int i;
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bool found = false;
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for (i = 0; i < 16 && !found; i++) {
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if (mr[i].enable && x >= mr[i].x &&
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x <= mr[i].x + mr[i].width &&
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y >= mr[i].y && y <= mr[i].y + mr[i].height)
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found = true;
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}
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if (!found)
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return -1;
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return (i - 1);
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}
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/* handle writing PID file, silently ignore if we can't do it */
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void create_pid_file(void)
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{
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char *home;
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char *pid;
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FILE *fp;
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home = getenv("HOME");
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if (home == NULL)
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return;
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pid = malloc(strlen(home) + 11);
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sprintf(pid, "%s/.wmix.pid", home);
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fp = fopen(pid, "w");
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if (fp) {
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fprintf(fp, "%d\n", getpid());
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fclose(fp);
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}
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free(pid);
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}
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