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/**
* @file x11grab.c X11 grabbing video-source
*
* Copyright (C) 2010 Creytiv.com
*/
#define _DEFAULT_SOURCE 1
#define _BSD_SOURCE 1
#include <unistd.h>
#ifndef SOLARIS
#define _XOPEN_SOURCE 1
#endif
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <pthread.h>
#include <re.h>
#include <rem.h>
#include <baresip.h>
/**
* @defgroup x11grab x11grab
*
* X11 window-grabbing video-source module
*
*
* XXX: add option to select a specific X window and x,y offset
*/
struct vidsrc_st {
const struct vidsrc *vs; /* inheritance */
Display *disp;
XImage *image;
pthread_t thread;
bool run;
int fps;
struct vidsz size;
enum vidfmt pixfmt;
vidsrc_frame_h *frameh;
void *arg;
};
static struct vidsrc *vidsrc;
static int x11grab_open(struct vidsrc_st *st, const struct vidsz *sz)
{
int x = 0, y = 0;
st->disp = XOpenDisplay(NULL);
if (!st->disp) {
warning("x11grab: error opening display\n");
return ENODEV;
}
st->image = XGetImage(st->disp,
RootWindow(st->disp, DefaultScreen(st->disp)),
x, y, sz->w, sz->h, AllPlanes, ZPixmap);
if (!st->image) {
warning("x11grab: error creating Ximage\n");
return ENODEV;
}
switch (st->image->bits_per_pixel) {
case 32:
st->pixfmt = VID_FMT_RGB32;
break;
case 16:
st->pixfmt = (st->image->green_mask == 0x7e0)
? VID_FMT_RGB565
: VID_FMT_RGB555;
break;
default:
warning("x11grab: not supported: bpp=%d\n",
st->image->bits_per_pixel);
return ENOSYS;
}
return 0;
}
static inline uint8_t *x11grab_read(struct vidsrc_st *st)
{
const int x = 0, y = 0;
XImage *im;
im = XGetSubImage(st->disp,
RootWindow(st->disp, DefaultScreen(st->disp)),
x, y, st->size.w, st->size.h, AllPlanes, ZPixmap,
st->image, 0, 0);
if (!im)
return NULL;
return (uint8_t *)st->image->data;
}
static void call_frame_handler(struct vidsrc_st *st, uint8_t *buf)
{
struct vidframe frame;
vidframe_init_buf(&frame, st->pixfmt, &st->size, buf);
st->frameh(&frame, st->arg);
}
static void *read_thread(void *arg)
{
struct vidsrc_st *st = arg;
uint64_t ts = tmr_jiffies();
uint8_t *buf;
while (st->run) {
if (tmr_jiffies() < ts) {
sys_msleep(4);
continue;
}
buf = x11grab_read(st);
if (!buf)
continue;
ts += (1000/st->fps);
call_frame_handler(st, buf);
}
return NULL;
}
static void destructor(void *arg)
{
struct vidsrc_st *st = arg;
if (st->run) {
st->run = false;
pthread_join(st->thread, NULL);
}
if (st->image)
XDestroyImage(st->image);
if (st->disp)
XCloseDisplay(st->disp);
}
static int alloc(struct vidsrc_st **stp, const struct vidsrc *vs,
struct media_ctx **ctx, struct vidsrc_prm *prm,
const struct vidsz *size, const char *fmt,
const char *dev, vidsrc_frame_h *frameh,
vidsrc_error_h *errorh, void *arg)
{
struct vidsrc_st *st;
int err;
(void)ctx;
(void)fmt;
(void)dev;
(void)errorh;
if (!stp || !prm || !size || !frameh)
return EINVAL;
st = mem_zalloc(sizeof(*st), destructor);
if (!st)
return ENOMEM;
st->vs = vs;
st->size = *size;
st->fps = prm->fps;
st->frameh = frameh;
st->arg = arg;
err = x11grab_open(st, size);
if (err)
goto out;
st->run = true;
err = pthread_create(&st->thread, NULL, read_thread, st);
if (err) {
st->run = false;
goto out;
}
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
static int x11grab_init(void)
{
return vidsrc_register(&vidsrc, baresip_vidsrcl(),
"x11grab", alloc, NULL);
}
static int x11grab_close(void)
{
vidsrc = mem_deref(vidsrc);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(x11grab) = {
"x11grab",
"vidsrc",
x11grab_init,
x11grab_close
};
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