wmix/misc.c

   1 /* WMix 3.0 -- a mixer using the OSS mixer API.
   2  * Copyright (C) 2000, 2001
   3  *      Daniel Richard G. <skunk@mit.edu>,
   4  *      timecop <timecop@japan.co.jp>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <sys/types.h>
  26 #include <stdio.h>
  27 #include <assert.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/time.h>
  32
  33 #include "include/common.h"
  34 #include "include/misc.h"
  35
  36 typedef struct {
  37     int enable;
  38     int x;
  39     int y;
  40     int width;
  41     int height;
  42 } MRegion;
  43 MRegion mr[16];
  44
  45 extern Config config;
  46
  47 /* Converts separate left and right channel volumes (each in [0, 1]) to
  48  * volume and balance values. (Volume is in [0, 1], balance is in [-1, 1])
  49  */
  50 void lr_to_vb(float left, float right, float *volume, float *balance)
  51 {
  52     assert((left >= 0.0) && (right >= 0.0));
  53
  54     *volume = MAX(left, right);
  55
  56     if (left > right)
  57         *balance = -1.0 + right / left;
  58     else if (right > left)
  59         *balance = 1.0 - left / right;
  60     else
  61         *balance = 0.0;
  62 }
  63
  64 /* Performs the reverse calculation of lr_to_vb()
  65  */
  66 void vb_to_lr(float volume, float balance, float *left, float *right)
  67 {
  68 /*    *left = volume; *right = volume; return; // XXX */
  69
  70     *left = volume * (1.0 - MAX(0.0, balance));
  71     *right = volume * (1.0 + MIN(0.0, balance));
  72 }
  73
  74 double get_current_time(void)
  75 {
  76     struct timeval tv;
  77     double t;
  78
  79     gettimeofday(&tv, NULL);
  80
  81     t = (double)tv.tv_sec;
  82     t += (double)tv.tv_usec / 1.0e6;
  83
  84     return t;
  85 }
  86
  87 void add_region(int index, int x, int y, int width, int height)
  88 {
  89     mr[index].enable = 1;
  90     mr[index].x = x;
  91     mr[index].y = y;
  92     mr[index].width = width;
  93     mr[index].height = height;
  94 }
  95
  96 int check_region(int x, int y)
  97 {
  98     register int i;
  99     bool found = false;
 100
 101     for (i = 0; i < 16 && !found; i++) {
 102         if (mr[i].enable && x >= mr[i].x &&
 103             x <= mr[i].x + mr[i].width &&
 104             y >= mr[i].y && y <= mr[i].y + mr[i].height)
 105             found = true;
 106     }
 107     if (!found)
 108         return -1;
 109     return (i - 1);
 110 }
 111
 112 void config_read(void)
 113 {
 114     FILE *fp;
 115     char buf[512];
 116     char *ptr;
 117
 118     if (config.file == NULL)
 119         return;
 120
 121     fp = fopen(config.file, "r");
 122     if (!fp)
 123         return;
 124
 125     while (fgets(buf, 512, fp)) {
 126         if ((ptr = strstr(buf, "mousewheel="))) {
 127             ptr += 11;
 128             config.mousewheel = atoi(ptr);
 129         }
 130         if ((ptr = strstr(buf, "scrolltext="))) {
 131             ptr += 11;
 132             config.scrolltext = atoi(ptr);
 133         }
 134         if ((ptr = strstr(buf, "osd="))) {
 135             ptr += 4;
 136             config.osd = atoi(ptr);
 137         }
 138         if ((ptr = strstr(buf, "osdcolor="))) {
 139             char *end;
 140             ptr += 9;
 141             end = strchr(ptr, '\n');
 142             ptr[end - ptr] = '\0';
 143             if (config.osd_color)
 144                 free(config.osd_color);
 145             config.osd_color = strdup(ptr);
 146         }
 147         if ((ptr = strstr(buf, "wheelstep="))) {
 148             ptr += 10;
 149             /* detect old style config */
 150             if (atoi(ptr) > 1)
 151                 config.scrollstep = (float)atoi(ptr) / 100.0;
 152             else
 153                 config.scrollstep = atof(ptr);
 154         }
 155         if ((ptr = strstr(buf, "wheelbtn1="))) {
 156             ptr += 10;
 157             config.wheel_button_up = atoi(ptr);
 158         }
 159         if ((ptr = strstr(buf, "wheelbtn2="))) {
 160             ptr += 10;
 161             config.wheel_button_down = atoi(ptr);
 162         }
 163     }
 164     fclose(fp);
 165 }
 166
 167 /* handle writing PID file, silently ignore if we can't do it */
 168 void create_pid_file(void)
 169 {
 170     char *home;
 171     char *pid;
 172     FILE *fp;
 173
 174     home = getenv("HOME");
 175     if (home == NULL)
 176         return;
 177
 178     pid = calloc(1, strlen(home) + 10);
 179     sprintf(pid, "%s/.wmix.pid", home);
 180     fp = fopen(pid, "w");
 181     if (fp) {
 182         fprintf(fp, "%d\n", getpid());
 183         fclose(fp);
 184     }
 185     free(pid);
 186 }