avdevice/xcbgrab: Add option for grabbing a window

The option allows to select a specific window instead of the whole
screen.

Reviewed-by: Andriy Gelman <andriy.gelman@gmail.com>
Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>

doc/indevs.texi

@@ -1564,8 +1564,21 @@ With @var{follow_mouse}:
 ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg
 @end example
 
+@item window_id
+Grab this window, instead of the whole screen. Default value is 0, which maps to
+the whole screen (root window).
+
+The id of a window can be found using the @command{xwininfo} program, possibly with options -tree and
+-root.
+
+If the window is later enlarged, the new area is not recorded. Video ends when
+the window is closed, unmapped (i.e., iconified) or shrunk beyond the video
+size (which defaults to the initial window size).
+
+This option disables options @option{follow_mouse} and @option{select_region}.
+
 @item video_size
-Set the video frame size. Default is the full desktop.
+Set the video frame size. Default is the full desktop or window.
 
 @item grab_x
 @item grab_y

libavdevice/xcbgrab.c

@@ -60,6 +60,7 @@ typedef struct XCBGrabContext {
     AVRational time_base;
     int64_t frame_duration;
 
+    xcb_window_t window_id;
     int x, y;
     int width, height;
     int frame_size;
@@ -82,6 +83,7 @@ typedef struct XCBGrabContext {
 #define OFFSET(x) offsetof(XCBGrabContext, x)
 #define D AV_OPT_FLAG_DECODING_PARAM
 static const AVOption options[] = {
+    { "window_id", "Window to capture.", OFFSET(window_id), AV_OPT_TYPE_INT, { .i64 = XCB_NONE }, 0, UINT32_MAX, D },
     { "x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
     { "y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
     { "grab_x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
@@ -157,7 +159,7 @@ static int xcbgrab_frame(AVFormatContext *s, AVPacket *pkt)
     XCBGrabContext *c = s->priv_data;
     xcb_get_image_cookie_t iq;
     xcb_get_image_reply_t *img;
-    xcb_drawable_t drawable = c->screen->root;
+    xcb_drawable_t drawable = c->window_id;
     xcb_generic_error_t *e = NULL;
     uint8_t *data;
     int length;
@@ -267,7 +269,7 @@ static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt)
     XCBGrabContext *c = s->priv_data;
     xcb_shm_get_image_cookie_t iq;
     xcb_shm_get_image_reply_t *img;
-    xcb_drawable_t drawable = c->screen->root;
+    xcb_drawable_t drawable = c->window_id;
     xcb_generic_error_t *e = NULL;
     AVBufferRef *buf;
     xcb_shm_seg_t segment;
@@ -333,7 +335,8 @@ static int check_xfixes(xcb_connection_t *conn)
 
 static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
                                xcb_query_pointer_reply_t *p,
-                               xcb_get_geometry_reply_t *geo)
+                               xcb_get_geometry_reply_t *geo,
+                               int win_x, int win_y)
 {
     XCBGrabContext *gr = s->priv_data;
     uint32_t *cursor;
@@ -355,17 +358,17 @@ static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
     cx = ci->x - ci->xhot;
     cy = ci->y - ci->yhot;
 
-    x = FFMAX(cx, gr->x);
-    y = FFMAX(cy, gr->y);
+    x = FFMAX(cx, win_x + gr->x);
+    y = FFMAX(cy, win_y + gr->y);
 
-    w = FFMIN(cx + ci->width,  gr->x + gr->width)  - x;
-    h = FFMIN(cy + ci->height, gr->y + gr->height) - y;
+    w = FFMIN(cx + ci->width,  win_x + gr->x + gr->width)  - x;
+    h = FFMIN(cy + ci->height, win_y + gr->y + gr->height) - y;
 
     c_off = x - cx;
-    i_off = x - gr->x;
+    i_off = x - gr->x - win_x;
 
     cursor += (y - cy) * ci->width;
-    image  += (y - gr->y) * gr->width * stride;
+    image  += (y - gr->y - win_y) * gr->width * stride;
 
     for (y = 0; y < h; y++) {
         cursor += c_off;
@@ -400,11 +403,11 @@ static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
 }
 #endif /* CONFIG_LIBXCB_XFIXES */
 
-static void xcbgrab_update_region(AVFormatContext *s)
+static void xcbgrab_update_region(AVFormatContext *s, int win_x, int win_y)
 {
     XCBGrabContext *c     = s->priv_data;
-    const uint32_t args[] = { c->x - c->region_border,
-                              c->y - c->region_border };
+    const uint32_t args[] = { win_x + c->x - c->region_border,
+                              win_y + c->y - c->region_border };
 
     xcb_configure_window(c->conn,
                          c->window,
@@ -417,17 +420,20 @@ static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
     XCBGrabContext *c = s->priv_data;
     xcb_query_pointer_cookie_t pc;
     xcb_get_geometry_cookie_t gc;
+    xcb_translate_coordinates_cookie_t tc;
     xcb_query_pointer_reply_t *p  = NULL;
     xcb_get_geometry_reply_t *geo = NULL;
+    xcb_translate_coordinates_reply_t *translate = NULL;
     int ret = 0;
     int64_t pts;
+    int win_x = 0, win_y = 0;
 
     wait_frame(s, pkt);
     pts = av_gettime();
 
     if (c->follow_mouse || c->draw_mouse) {
-        pc  = xcb_query_pointer(c->conn, c->screen->root);
-        gc  = xcb_get_geometry(c->conn, c->screen->root);
+        pc  = xcb_query_pointer(c->conn, c->window_id);
+        gc  = xcb_get_geometry(c->conn, c->window_id);
         p   = xcb_query_pointer_reply(c->conn, pc, NULL);
         if (!p) {
             av_log(s, AV_LOG_ERROR, "Failed to query xcb pointer\n");
@@ -440,12 +446,25 @@ static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
             return AVERROR_EXTERNAL;
         }
     }
+    if (c->window_id != c->screen->root) {
+        tc = xcb_translate_coordinates(c->conn, c->window_id, c->screen->root, 0, 0);
+        translate = xcb_translate_coordinates_reply(c->conn, tc, NULL);
+        if (!translate) {
+            free(p);
+            free(geo);
+            av_log(s, AV_LOG_ERROR, "Failed to translate xcb geometry\n");
+            return AVERROR_EXTERNAL;
+        }
+        win_x = translate->dst_x;
+        win_y = translate->dst_y;
+        free(translate);
+    }
 
     if (c->follow_mouse && p->same_screen)
         xcbgrab_reposition(s, p, geo);
 
     if (c->show_region)
-        xcbgrab_update_region(s);
+        xcbgrab_update_region(s, win_x, win_y);
 
 #if CONFIG_LIBXCB_SHM
     if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0) {
@@ -460,7 +479,7 @@ static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
 
 #if CONFIG_LIBXCB_XFIXES
     if (ret >= 0 && c->draw_mouse && p->same_screen)
-        xcbgrab_draw_mouse(s, pkt, p, geo);
+        xcbgrab_draw_mouse(s, pkt, p, geo, win_x, win_y);
 #endif
 
     free(p);
@@ -572,10 +591,12 @@ static int create_stream(AVFormatContext *s)
 
     avpriv_set_pts_info(st, 64, 1, 1000000);
 
-    gc  = xcb_get_geometry(c->conn, c->screen->root);
+    gc  = xcb_get_geometry(c->conn, c->window_id);
     geo = xcb_get_geometry_reply(c->conn, gc, NULL);
-    if (!geo)
+    if (!geo) {
+        av_log(s, AV_LOG_ERROR, "Can't find window '0x%x', aborting.\n", c->window_id);
         return AVERROR_EXTERNAL;
+    }
 
     if (!c->width || !c->height) {
         c->width = geo->width;
@@ -831,6 +852,19 @@ static av_cold int xcbgrab_read_header(AVFormatContext *s)
         return AVERROR(EIO);
     }
 
+    if (c->window_id == XCB_NONE)
+        c->window_id = c->screen->root;
+    else {
+        if (c->select_region) {
+            av_log(s, AV_LOG_WARNING, "select_region ignored with window_id.\n");
+            c->select_region = 0;
+        }
+        if (c->follow_mouse) {
+            av_log(s, AV_LOG_WARNING, "follow_mouse ignored with window_id.\n");
+            c->follow_mouse = 0;
+        }
+    }
+
     if (c->select_region) {
         ret = select_region(s);
         if (ret < 0) {