mp_fifo.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdlib.h>
  20 #include "osdep/timer.h"
  21 #include "input/input.h"
  22 #include "input/keycodes.h"
  23 #include "mp_fifo.h"
  24 #include "talloc.h"
  25 #include "options.h"
  26
  27
  28 struct mp_fifo {
  29     struct MPOpts *opts;
  30     int *data;
  31     int readpos;
  32     int writepos;
  33     int size;
  34     int last_key_down;
  35     unsigned last_down_time;
  36 };
  37
  38 struct mp_fifo *mp_fifo_create(struct MPOpts *opts)
  39 {
  40     struct mp_fifo *fifo = talloc_zero(NULL, struct mp_fifo);
  41     fifo->opts = opts;
  42     fifo->size = opts->key_fifo_size;
  43     fifo->data = talloc_array_ptrtype(fifo, fifo->data, fifo->size);
  44     return fifo;
  45 }
  46
  47 static void mplayer_put_key_internal(struct mp_fifo *fifo, int code)
  48 {
  49     int fifo_free = fifo->readpos - fifo->writepos - 1;
  50     if (fifo_free < 0)
  51         fifo_free += fifo->size;
  52     if (!fifo_free)
  53         return; // FIFO FULL!!
  54     // reserve some space for key release events to avoid stuck keys
  55     if((code & MP_KEY_DOWN) && fifo_free < (fifo->size >> 1))
  56         return;
  57     fifo->data[fifo->writepos++] = code;
  58     fifo->writepos %= fifo->size;
  59 }
  60
  61 int mplayer_get_key(void *ctx, int fd)
  62 {
  63     struct mp_fifo *fifo = ctx;
  64     if (fifo->writepos == fifo->readpos)
  65         return MP_INPUT_NOTHING;
  66     int key = fifo->data[fifo->readpos++];
  67     fifo->readpos %= fifo->size;
  68     return key;
  69 }
  70
  71 static void put_double(struct mp_fifo *fifo, int code)
  72 {
  73   if (code >= MOUSE_BTN0 && code < MOUSE_BTN_END)
  74       mplayer_put_key_internal(fifo, code - MOUSE_BTN0 + MOUSE_BTN0_DBL);
  75 }
  76
  77 void mplayer_put_key(struct mp_fifo *fifo, int code)
  78 {
  79     unsigned now = GetTimerMS();
  80     int doubleclick_time = fifo->opts->doubleclick_time;
  81     // ignore system-doubleclick if we generate these events ourselves
  82     if (doubleclick_time
  83         && (code & ~MP_KEY_DOWN) >= MOUSE_BTN0_DBL
  84         && (code & ~MP_KEY_DOWN) < MOUSE_BTN_DBL_END)
  85         return;
  86     mplayer_put_key_internal(fifo, code);
  87     if (code & MP_KEY_DOWN) {
  88         code &= ~MP_KEY_DOWN;
  89         if (fifo->last_key_down == code
  90             && now - fifo->last_down_time < doubleclick_time)
  91             put_double(fifo, code);
  92         fifo->last_key_down = code;
  93         fifo->last_down_time = now;
  94     }
  95 }