mixer.c

操作系统源代码

               {
                 device++;
                 if (device == Mic && input_pos > 8) input_pos = 8;
               }
               else 
               { 
                 device = Cd; 
                 output_scr = 1; 
                 input_scr = 0; 
                 output_pos = 0; 
               }
             }
           }
           else 
           {
             if (device != Mic && device != Speaker)  right = 1;
             else { device++; right = 0; }
           }
          };break;
          case UP: 
          {
           if (output_scr) 
           {
             if (device > Cd) device--;
             else 
             {
               device = Mic; 
               output_scr = 0;
               input_scr = 1;
             }
           }
           else if (!right || input_scr)
           {
             if (input_scr)
             {
               if (device > Fm) device--;
               else 
               {
                 input_scr = 0;
                 device = Bass;
                 right = 1;
               }
             }
             else 
             {
               if (device > Master) 
               {
                 device--;         
                 if (device != Mic && device != Speaker) right = 1;
               }
             }
           }
           else 
             right = 0;
          };break;
          case RIGHT: 
          {
            if (output_scr) 
            {
              if (output_pos < 8 && device != Mic) output_pos = 8;
            }
            else if (!input_scr)
            {
              if (device < Speaker) max_level = 31;
              else if (device > Speaker) max_level = 15;
              else max_level = 4;

              if (!right) 
              {
                if (levels[device].left < max_level) levels[device].left+=
                  (device < Speaker ? 2 : 1);
              }
              else
              {
                if (levels[device].right < max_level) levels[device].right+=
                  (device < Speaker ? 2 : 1);
              }
              ioctl(fd, MIXIOSETVOLUME, &levels[device]); 
              ioctl(fd, MIXIOGETVOLUME, &levels[device]); 
              create_slider(1 + (device < Treble ? 0 : 39), 
                            (device - (device < Treble ? 0 : Treble))*3 +
                            (device != Speaker ? 2 : 1), device);
            }
            else
            {
              if ((device != Mic && input_pos < 12) ||
                  (device == Mic && input_pos < 8))
                input_pos += (4 + (device == Mic ? 4 : 0));
            }
          };break;
          case LEFT: 
          {
            if (output_scr)
            {
              if (output_pos > 0) output_pos = 0;
            }
            else if (!input_scr)
            {
              if (!right)
              {
                if (levels[device].left > 0) levels[device].left-=
                  (device < Speaker ? 2 : 1);
              }
              else
              {
                if (levels[device].right > 0) levels[device].right-=
                  (device < Speaker ? 2 : 1);
              }
              ioctl(fd, MIXIOSETVOLUME, &levels[device]); 
              ioctl(fd, MIXIOGETVOLUME, &levels[device]); 
              create_slider(1 + (device < Treble ? 0 : 39), 
                            (device - (device < Treble ? 0 : Treble))*3 +
                            (device != Speaker ? 2 : 1), device);
            }
            else
            {
              if (input_pos > 0) 
                input_pos -= (4 + (device == Mic ? 4 : 0));
            } 
          };break;
        } 
      };break;
    case SPACE:
      {
        if (output_scr)
        {
          switch(output_pos)
          {
            case 0:
            case 4:
            {
              outputs[device].left = 
               (outputs[device].left == ON ? OFF : ON);
              ioctl(fd, MIXIOSETOUTPUT, &outputs[device]);
            };break;
            case 8:
            {
              outputs[device].right = 
               (outputs[device].right == ON ? OFF : ON);
              ioctl(fd, MIXIOSETOUTPUT, &outputs[device]);
            };break;
          }
          ioctl(fd, MIXIOGETOUTPUT, &outputs[device]);
          show_outputs(41,16);
        }
        else if (input_scr)
        { 
          switch(input_pos)
          {
            case 0:
            {
              inputs_left[device].left = 
               (inputs_left[device].left == ON ? OFF : ON);
              ioctl(fd, MIXIOSETINPUTLEFT, &inputs_left[device]);
            };break;
            case 4:
            {
              inputs_left[device].right = 
               (inputs_left[device].right == ON ? OFF : ON);
              ioctl(fd, MIXIOSETINPUTLEFT, &inputs_left[device]);
            };break;
            case 8:
            {
              inputs_right[device].left = 
               (inputs_right[device].left == ON ? OFF : ON);
              ioctl(fd, MIXIOSETINPUTRIGHT, &inputs_right[device]);
            };break;
            case 12:
            {
              inputs_right[device].right = 
               (inputs_right[device].right == ON ? OFF : ON);
              ioctl(fd, MIXIOSETINPUTRIGHT, &inputs_right[device]);
            };break;
          }
          ioctl(fd, MIXIOGETINPUTLEFT, &inputs_left[device]);
          ioctl(fd, MIXIOGETINPUTRIGHT, &inputs_right[device]);
          show_inputs(41,8);
        }
      };break;
      case 's':
      {
        if (write_settings())  
          mvwprintw(main_win,22,28, "mixer settings saved");
        else
          mvwprintw(main_win,22,28, "error: file not saved");
        wrefresh(main_win);
        sleep(1);
        mvwprintw(main_win,22,28, "                           ");
      };break;
      case 'r':
      {
        if (read_settings())
          mvwprintw(main_win,22,28, "mixer settings restored");
        else
          mvwprintw(main_win,22,28, "error: could not open");
        wrefresh(main_win);
        sleep(1);
        setup_screen();
      };break;
      case 'e': terminate(1);
    }
  } 
}


char *d_name(device, name)
enum Device device;
char *name;
{
  /* Convert the device number to a name */

  switch (device)
  {
    case Master:	strncpy(name, "Master  \0", 9);break;
    case Dac:		strncpy(name, "Dac     \0", 9);break;
    case Fm:		strncpy(name, "Fm      \0", 9);break;
    case Cd:		strncpy(name, "CD      \0", 9);break;
    case Line:		strncpy(name, "Line    \0", 9);break;
    case Mic:		strncpy(name, "Mic     \0", 9);break;
    case Speaker:	strncpy(name, "Speaker \0", 9);break;
    case Treble:	strncpy(name, "Treble  \0", 9);break;
    case Bass:		strncpy(name, "Bass    \0", 9);break;
  }
  return name;
}


void create_slider(x, y, device)
int x;
int y;
enum Device device;
{
  /* Create a slider on the screen */

  int left;
  int right;
  int i;

  mvwprintw(main_win,y,x, "%s", d_name(device, name));

  left = levels[device].left / (device < Speaker ? 2 : 1); 
  right = levels[device].right / (device < Speaker ? 2 : 1); 

  for (i = 0; i < 16; i++)
  {
    if (device != Speaker || i < 4)
      mvwprintw(main_win,y,x+i+8, (i == left ? "*" : "-"));
    if (device < Mic || device > Speaker) 
      mvwprintw(main_win,y+1,x+i+8, (i == right ? "*" : "-"));
  }

  if (device < Mic || device > Speaker)
  {
    mvwprintw(main_win,y,x+i+10, "left");
    mvwprintw(main_win,y+1,x+i+10, "right");
  }
  wrefresh(main_win);
} 
  
void show_inputs(x,y)
int x;
int y;
{
  /* Show the input settings */

  int i;

  mvwprintw(main_win,y,x,  "             Rec-In  ");
  mvwprintw(main_win,y+1,x,"          left    right");
  mvwprintw(main_win,y+2,x,"          l   r   l   r");
  for (i = Fm; i <= Line; i++)
  {
    mvwprintw(main_win,y+i+1,x,  "%s  %d   %d   %d   %d", 
      d_name(i, (char *)name),
      (inputs_left[i].left == ON ? 1 : 0),
      (inputs_left[i].right == ON ? 1 : 0),
      (inputs_right[i].left == ON ? 1 : 0),
      (inputs_right[i].right == ON ? 1 : 0));
  }
  mvwprintw(main_win,y+i+1,x,  "%s    %d       %d", 
    d_name(Mic, (char *)name),
    (inputs_left[Mic].left == ON ? 1 : 0),
    (inputs_right[Mic].left == ON ? 1 : 0));
  wrefresh(main_win);
}

void show_outputs(x,y)
int x;
int y;
{
  /* Show the output settings */

  int i;

  mvwprintw(main_win,y,x,      "            Mix-Out  ");
  mvwprintw(main_win,y+1,x,    "          left    right");
  for (i = Cd; i <= Line; i++)
  {
    mvwprintw(main_win,y+i-1,x,"%s    %d       %d", 
      d_name(i, (char *)name),
      (outputs[i].left == ON ? 1 : 0),
      (outputs[i].right == ON ? 1 : 0));
  }
  mvwprintw(main_win,y+i-1,x,"%s        %d", 
    d_name(Mic, (char *)name),
    (outputs[Mic].left == ON ? 1 : 0));

  wrefresh(main_win);
}


void setup_screen()
{
  int i;

  wclear(main_win);
  mvwprintw(main_win,0,23,"------- Mixer Controls -------");
  wrefresh(main_win);
 
  for(i = 0; i <= Speaker; i++)
   create_slider(1, i*3+(i <= Mic ? 2 : 1), i);

   create_slider(40, 2, Treble);
   create_slider(40, 5, Bass);
 
   show_inputs(41,8);
   show_outputs(41,16);
}