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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>
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@ -1564,8 +1564,21 @@ With @var{follow_mouse}:
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ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg
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@end example
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@item window_id
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Grab this window, instead of the whole screen. Default value is 0, which maps to
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the whole screen (root window).
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The id of a window can be found using the @command{xwininfo} program, possibly with options -tree and
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-root.
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If the window is later enlarged, the new area is not recorded. Video ends when
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the window is closed, unmapped (i.e., iconified) or shrunk beyond the video
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size (which defaults to the initial window size).
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This option disables options @option{follow_mouse} and @option{select_region}.
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@item video_size
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Set the video frame size. Default is the full desktop.
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Set the video frame size. Default is the full desktop or window.
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@item grab_x
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@item grab_y
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@ -60,6 +60,7 @@ typedef struct XCBGrabContext {
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AVRational time_base;
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int64_t frame_duration;
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xcb_window_t window_id;
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int x, y;
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int width, height;
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int frame_size;
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@ -82,6 +83,7 @@ typedef struct XCBGrabContext {
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#define OFFSET(x) offsetof(XCBGrabContext, x)
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#define D AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{ "window_id", "Window to capture.", OFFSET(window_id), AV_OPT_TYPE_INT, { .i64 = XCB_NONE }, 0, UINT32_MAX, D },
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{ "x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
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{ "y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
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{ "grab_x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
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@ -157,7 +159,7 @@ static int xcbgrab_frame(AVFormatContext *s, AVPacket *pkt)
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XCBGrabContext *c = s->priv_data;
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xcb_get_image_cookie_t iq;
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xcb_get_image_reply_t *img;
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xcb_drawable_t drawable = c->screen->root;
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xcb_drawable_t drawable = c->window_id;
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xcb_generic_error_t *e = NULL;
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uint8_t *data;
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int length;
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@ -267,7 +269,7 @@ static int xcbgrab_frame_shm(AVFormatContext *s, AVPacket *pkt)
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XCBGrabContext *c = s->priv_data;
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xcb_shm_get_image_cookie_t iq;
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xcb_shm_get_image_reply_t *img;
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xcb_drawable_t drawable = c->screen->root;
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xcb_drawable_t drawable = c->window_id;
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xcb_generic_error_t *e = NULL;
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AVBufferRef *buf;
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xcb_shm_seg_t segment;
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@ -333,7 +335,8 @@ static int check_xfixes(xcb_connection_t *conn)
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static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
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xcb_query_pointer_reply_t *p,
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xcb_get_geometry_reply_t *geo)
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xcb_get_geometry_reply_t *geo,
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int win_x, int win_y)
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{
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XCBGrabContext *gr = s->priv_data;
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uint32_t *cursor;
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@ -355,17 +358,17 @@ static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
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cx = ci->x - ci->xhot;
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cy = ci->y - ci->yhot;
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x = FFMAX(cx, gr->x);
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y = FFMAX(cy, gr->y);
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x = FFMAX(cx, win_x + gr->x);
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y = FFMAX(cy, win_y + gr->y);
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w = FFMIN(cx + ci->width, gr->x + gr->width) - x;
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h = FFMIN(cy + ci->height, gr->y + gr->height) - y;
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w = FFMIN(cx + ci->width, win_x + gr->x + gr->width) - x;
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h = FFMIN(cy + ci->height, win_y + gr->y + gr->height) - y;
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c_off = x - cx;
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i_off = x - gr->x;
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i_off = x - gr->x - win_x;
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cursor += (y - cy) * ci->width;
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image += (y - gr->y) * gr->width * stride;
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image += (y - gr->y - win_y) * gr->width * stride;
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for (y = 0; y < h; y++) {
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cursor += c_off;
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@ -400,11 +403,11 @@ static void xcbgrab_draw_mouse(AVFormatContext *s, AVPacket *pkt,
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}
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#endif /* CONFIG_LIBXCB_XFIXES */
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static void xcbgrab_update_region(AVFormatContext *s)
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static void xcbgrab_update_region(AVFormatContext *s, int win_x, int win_y)
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{
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XCBGrabContext *c = s->priv_data;
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const uint32_t args[] = { c->x - c->region_border,
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c->y - c->region_border };
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const uint32_t args[] = { win_x + c->x - c->region_border,
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win_y + c->y - c->region_border };
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xcb_configure_window(c->conn,
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c->window,
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@ -417,17 +420,20 @@ static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
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XCBGrabContext *c = s->priv_data;
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xcb_query_pointer_cookie_t pc;
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xcb_get_geometry_cookie_t gc;
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xcb_translate_coordinates_cookie_t tc;
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xcb_query_pointer_reply_t *p = NULL;
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xcb_get_geometry_reply_t *geo = NULL;
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xcb_translate_coordinates_reply_t *translate = NULL;
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int ret = 0;
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int64_t pts;
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int win_x = 0, win_y = 0;
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wait_frame(s, pkt);
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pts = av_gettime();
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if (c->follow_mouse || c->draw_mouse) {
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pc = xcb_query_pointer(c->conn, c->screen->root);
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gc = xcb_get_geometry(c->conn, c->screen->root);
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pc = xcb_query_pointer(c->conn, c->window_id);
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gc = xcb_get_geometry(c->conn, c->window_id);
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p = xcb_query_pointer_reply(c->conn, pc, NULL);
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if (!p) {
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av_log(s, AV_LOG_ERROR, "Failed to query xcb pointer\n");
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@ -440,12 +446,25 @@ static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
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return AVERROR_EXTERNAL;
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}
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}
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if (c->window_id != c->screen->root) {
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tc = xcb_translate_coordinates(c->conn, c->window_id, c->screen->root, 0, 0);
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translate = xcb_translate_coordinates_reply(c->conn, tc, NULL);
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if (!translate) {
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free(p);
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free(geo);
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av_log(s, AV_LOG_ERROR, "Failed to translate xcb geometry\n");
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return AVERROR_EXTERNAL;
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}
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win_x = translate->dst_x;
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win_y = translate->dst_y;
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free(translate);
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}
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if (c->follow_mouse && p->same_screen)
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xcbgrab_reposition(s, p, geo);
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if (c->show_region)
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xcbgrab_update_region(s);
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xcbgrab_update_region(s, win_x, win_y);
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#if CONFIG_LIBXCB_SHM
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if (c->has_shm && xcbgrab_frame_shm(s, pkt) < 0) {
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@ -460,7 +479,7 @@ static int xcbgrab_read_packet(AVFormatContext *s, AVPacket *pkt)
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#if CONFIG_LIBXCB_XFIXES
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if (ret >= 0 && c->draw_mouse && p->same_screen)
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xcbgrab_draw_mouse(s, pkt, p, geo);
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xcbgrab_draw_mouse(s, pkt, p, geo, win_x, win_y);
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#endif
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free(p);
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@ -572,10 +591,12 @@ static int create_stream(AVFormatContext *s)
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avpriv_set_pts_info(st, 64, 1, 1000000);
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gc = xcb_get_geometry(c->conn, c->screen->root);
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gc = xcb_get_geometry(c->conn, c->window_id);
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geo = xcb_get_geometry_reply(c->conn, gc, NULL);
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if (!geo)
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if (!geo) {
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av_log(s, AV_LOG_ERROR, "Can't find window '0x%x', aborting.\n", c->window_id);
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return AVERROR_EXTERNAL;
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}
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if (!c->width || !c->height) {
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c->width = geo->width;
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@ -831,6 +852,19 @@ static av_cold int xcbgrab_read_header(AVFormatContext *s)
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return AVERROR(EIO);
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}
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if (c->window_id == XCB_NONE)
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c->window_id = c->screen->root;
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else {
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if (c->select_region) {
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av_log(s, AV_LOG_WARNING, "select_region ignored with window_id.\n");
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c->select_region = 0;
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}
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if (c->follow_mouse) {
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av_log(s, AV_LOG_WARNING, "follow_mouse ignored with window_id.\n");
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c->follow_mouse = 0;
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}
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}
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if (c->select_region) {
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ret = select_region(s);
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if (ret < 0) {
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