A new configurable input system and joystick support for this system

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4419 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 163 insertions, 0 deletions

diff --git a/input/joystick.c b/input/joystick.c
new file mode 100644
index 0000000000..7bb7f0d86b
--- /dev/null
+++ b/input/joystick.c
@@ -0,0 +1,163 @@
+
+#include "../config.h"
+
+#ifdef HAVE_JOYSTICK
+
+#include "joystick.h"
+#include "input.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#ifndef JOY_AXIS_DELTA
+#define JOY_AXIS_DELTA 500
+#endif
+
+#ifndef JS_DEV
+#define JS_DEV "/dev/input/js0"
+#endif
+
+#ifdef TARGET_LINUX
+
+#include <linux/joystick.h>
+
+static int buttons = 0;
+static int* axis;
+
+int mp_input_joystick_init(char* dev) {
+  int fd,l=0;
+  int inited = 0;
+  struct js_event ev;
+  char n_axis;
+  
+  printf("Opening joystick device %s\n",dev ? dev : JS_DEV);
+
+  fd = open( dev ? dev : JS_DEV , O_RDONLY | O_NONBLOCK );
+  if(fd < 0) {
+    printf("Can't open joystick device %s : %s\n",dev ? dev : JS_DEV,strerror(errno));
+    return -1;
+  }
+
+  if(ioctl(fd, JSIOCGAXES, &n_axis) < 0) {
+    printf("Joystick : can't get number of axis, %s\n",strerror(errno));
+    close(fd);
+    return -1;
+  }
+
+  axis = (int*)malloc(n_axis*sizeof(int));
+  
+  
+  while(! inited) {
+    l = 0;
+    while((unsigned int)l < sizeof(struct js_event)) {
+      int r = read(fd,&ev+l,sizeof(struct js_event)-l);
+      if(r < 0) {
+	if(errno == EINTR)
+	  continue;
+	else if(errno == EAGAIN) {
+	  inited = 1;
+	  break;
+	}
+	printf("Error while reading joystick device : %s\n",strerror(errno));
+	close(fd);
+	return -1;
+      }	
+      l += r;
+    }
+    if((unsigned int)l < sizeof(struct js_event)) {
+      if(l > 0)
+	printf("Joystick : we loose %d bytes of data\n",l);
+      return fd;
+    }
+    if(ev.type & JS_EVENT_INIT) {
+      ev.type &= ~JS_EVENT_INIT;
+      if(ev.type & JS_EVENT_BUTTON)
+	buttons |= (ev.value << ev.number);
+      else if(ev.type & JS_EVENT_AXIS)
+	axis[ev.number] = ev.value;
+    } else
+      printf("Joystick : Warning non-init event during init :-o\n");
+  }
+	
+  return fd;
+}
+
+int mp_input_joystick_read(int fd) {
+  struct js_event ev;
+  int l=0;
+
+  while((unsigned int)l < sizeof(struct js_event)) {
+    int r = read(fd,&ev+l,sizeof(struct js_event)-l);
+    if(r <= 0) {
+      if(errno == EINTR)
+	continue;
+      else if(errno == EAGAIN)
+	return MP_INPUT_NOTHING;
+      if( r < 0)
+	printf("Joystick error while reading joystick device : %s\n",strerror(errno));
+      else
+	printf("Joystick error while reading joystick device : EOF\n");
+      return MP_INPUT_DEAD;
+    } 	
+    l += r;
+  }
+
+  if((unsigned int)l < sizeof(struct js_event)) {
+    if(l > 0)
+      printf("Joystick : we loose %d bytes of data\n",l);
+    return MP_INPUT_NOTHING;
+  }
+
+  if(ev.type & JS_EVENT_INIT) {
+    printf("Joystick : warning reinit (Can happend more than on time)\n");
+     ev.type &= ~JS_EVENT_INIT;
+     if(ev.type & JS_EVENT_BUTTON)
+       buttons |= (ev.value << ev.number);
+     else if(ev.type & JS_EVENT_AXIS)
+       axis[ev.number] = ev.value;
+     else
+       printf("Joystick warning unknow event type %d\n",ev.type);
+     return mp_input_joystick_read(fd);
+  }
+
+  ev.type &= ~JS_EVENT_INIT;
+  
+  if(ev.type & JS_EVENT_BUTTON) {
+    int b = buttons | (ev.value << ev.number);
+    if(b != buttons)
+      return JOY_BTN0+ev.number;      
+  } else if(ev.type & JS_EVENT_AXIS) {
+    if(ev.value - axis[ev.number] > JOY_AXIS_DELTA)
+      return ev.number == 0 ? JOY_UP : JOY_LEFT;
+    else if(axis[ev.number]  - ev.value > JOY_AXIS_DELTA)
+      return ev.number == 0 ? JOY_DOWN : JOY_RIGHT;
+  } else {
+    printf("Joystick warning unknow event type %d\n",ev.type);
+    return MP_INPUT_ERROR;
+  }
+
+  return MP_INPUT_NOTHING;
+}
+
+#else
+
+// dummy function
+
+int mp_input_joystick_init(char* dev) {
+  return -1;
+}
+
+int mp_input_joystick_read(int fd) {
+  
+  return MP_INPUT_NOTHING;
+}
+
+#endif
+
+#endif