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x11grab: Fallback to normal XImage if SHM is not supported

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This commit is contained in:
Luca Barbato 2014-08-09 21:37:02 +02:00
parent c19a49e565
commit bb3ead7e54
1 changed files with 34 additions and 26 deletions
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60
libavdevice/x11grab.c
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@ -139,6 +139,35 @@ static void x11grab_region_win_init(X11GrabContext *s)
x11grab_draw_region_win(s);
}
static int setup_shm(AVFormatContext *s, Display *dpy, XImage **image)
{
X11GrabContext *g = s->priv_data;
int scr = XDefaultScreen(dpy);
XImage *img = XShmCreateImage(dpy, DefaultVisual(dpy, scr),
DefaultDepth(dpy, scr), ZPixmap, NULL,
&g->shminfo, g->width, g->height);
g->shminfo.shmid = shmget(IPC_PRIVATE, img->bytes_per_line * img->height,
IPC_CREAT | 0777);
if (g->shminfo.shmid == -1) {
av_log(s, AV_LOG_ERROR, "Cannot get shared memory!\n");
return AVERROR(ENOMEM);
}
g->shminfo.shmaddr = img->data = shmat(g->shminfo.shmid, 0, 0);
g->shminfo.readOnly = False;
if (!XShmAttach(dpy, &g->shminfo)) {
av_log(s, AV_LOG_ERROR, "Failed to attach shared memory!\n");
/* needs some better error subroutine :) */
return AVERROR(EIO);
}
*image = img;
return 0;
}
/**
* Initialize the x11 grab device demuxer (public device demuxer API).
*
@ -225,33 +254,12 @@ static int x11grab_read_header(AVFormatContext *s1)
av_log(s1, AV_LOG_INFO,
"shared memory extension %sfound\n", use_shm ? "" : "not ");
if (use_shm) {
int scr = XDefaultScreen(dpy);
image = XShmCreateImage(dpy,
DefaultVisual(dpy, scr),
DefaultDepth(dpy, scr),
ZPixmap,
NULL,
&x11grab->shminfo,
x11grab->width, x11grab->height);
x11grab->shminfo.shmid = shmget(IPC_PRIVATE,
image->bytes_per_line * image->height,
IPC_CREAT | 0777);
if (x11grab->shminfo.shmid == -1) {
av_log(s1, AV_LOG_ERROR, "Fatal: Can't get shared memory!\n");
ret = AVERROR(ENOMEM);
goto out;
}
x11grab->shminfo.shmaddr = image->data = shmat(x11grab->shminfo.shmid, 0, 0);
x11grab->shminfo.readOnly = False;
if (use_shm && setup_shm(s1, dpy, &image) < 0) {
av_log(s1, AV_LOG_WARNING, "Falling back to XGetImage\n");
use_shm = 0;
}
if (!XShmAttach(dpy, &x11grab->shminfo)) {
av_log(s1, AV_LOG_ERROR, "Fatal: Failed to attach shared memory!\n");
/* needs some better error subroutine :) */
ret = AVERROR(EIO);
goto out;
}
} else {
if (!use_shm) {
image = XGetImage(dpy, RootWindow(dpy, screen),
x_off, y_off,
x11grab->width, x11grab->height,