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