[svn-commits] rizzo: branch rizzo/video_v2 r89197 - /team/rizzo/video_v2/channels/

[SVN commits to the Digium repositories]

Author: rizzo
Date: Mon Nov 12 15:47:27 2007
New Revision: 89197

URL: http://svn.digium.com/view/asterisk?view=rev&rev=89197
Log:
more comments on the handling of buffers for incoming video,
and on the handling of SDL events.


Modified:
    team/rizzo/video_v2/channels/console_video.c

Modified: team/rizzo/video_v2/channels/console_video.c
URL: http://svn.digium.com/view/asterisk/team/rizzo/video_v2/channels/console_video.c?view=diff&rev=89197&r1=89196&r2=89197
==============================================================================
--- team/rizzo/video_v2/channels/console_video.c (original)
+++ team/rizzo/video_v2/channels/console_video.c Mon Nov 12 15:47:27 2007
@@ -227,9 +227,12 @@
  *	codec, no memory, etc.) and we must drop all incoming frames.
  *
  * Incoming payload is stored in one of the dec_in[] buffers, which are
- * emptied by the video thread. dec_in_cur is the buffer in use by the
- * incoming frame, dec_in_dpy is the one being displayed.
- * We synchronize on dec_in_lock;
+ * emptied by the video thread. These buffers are organized in a circular
+ * queue, with dec_in_cur being the buffer in use by the incoming stream,
+ * and dec_in_dpy is the one being displayed. When the pointers need to
+ * be changed, we synchronize the access to them with dec_in_lock.
+ * When the list is full dec_in_cur = NULL (we cannot store new data),
+ * when the list is empty dec_in_dpy is NULL (we cannot display frames).
  */
 struct video_in_desc {
 	struct video_codec_desc *dec;	/* decoder */
@@ -2067,7 +2070,6 @@
 		/* prepare to decode: advance the buffer so the video thread knows. */
 		struct fbuf_t *tmp = v->dec_in_cur;	/* store current pointer */
 		ast_mutex_lock(&v->dec_in_lock);
-		fprintf(stderr, "using buffer %d\n", v->dec_in_cur - v->dec_in);
 		if (++v->dec_in_cur == &v->dec_in[N_DEC_IN])	/* advance to next, circular */
 			v->dec_in_cur = &v->dec_in[0];
 		if (v->dec_in_dpy == NULL) {	/* were not displaying anything, so set it */
@@ -2121,6 +2123,13 @@
 	return v->enc->enc_encap(v, tail);
 }
 
+/*
+ * I am seeing some kind of deadlock or stall around
+ * SDL_PumpEvents() while moving the window on a remote X server
+ * (Xfree86-4.4.0), but it is unclear what causes it.
+ * Could well be a problem on the X server I am using.
+ */
+
 /* grab a bunch of events */
 static void eventhandler(struct video_desc *env)
 {
@@ -2128,16 +2137,24 @@
 	int i, n;
 	SDL_Event ev[N_EVENTS];
 
-	return;
-
-	while ( (n = SDL_PeepEvents(ev, N_EVENTS, SDL_GETEVENT, SDL_ALLEVENTS)) > 0) {
+#define MY_EV (SDL_MOUSEBUTTONDOWN|SDL_KEYDOWN)
+	while ( (n = SDL_PeepEvents(ev, N_EVENTS, SDL_GETEVENT, MY_EV)) > 0) {
 		for (i = 0; i < n; i++) {
 			ast_log(LOG_WARNING, "-- event %d at %d %d\n",
 			 ev[i].type,  ev[i].button.x,  ev[i].button.y);
 		}
 	}
 	ast_log(LOG_WARNING, "-- no event, n %d\n", n);
-	SDL_PumpEvents();
+	if (0) {
+		struct timeval a = ast_tvnow();
+		//SDL_Lock_EventThread();
+		a = ast_tvnow();
+		fprintf(stderr, "before Pump at %ld.%06lu\n", a.tv_sec, a.tv_usec);
+		SDL_PumpEvents();
+		a = ast_tvnow();
+		fprintf(stderr, "after Pump at %ld.%06lu\n", a.tv_sec, a.tv_usec);
+		//SDL_Unlock_EventThread();
+	}
 }
 
 static void sdl_setup(struct video_desc *env);
@@ -2188,8 +2205,12 @@
 			    sprintf(buf, "hold");
 			SDL_WM_SetCaption(buf, NULL);
 		}
+		eventhandler(env);
 		/* sleep for a while */
-		ast_select(0, NULL, NULL, NULL, &t);
+		if (1)
+			SDL_Delay(50);
+		else
+			ast_select(0, NULL, NULL, NULL, &t);
 
 		SDL_UpdateRects(env->screen, 1, &env->win[WIN_KEYPAD].rect);// XXX inefficient
 		/*
@@ -2214,7 +2235,6 @@
 			ast_mutex_unlock(&v->dec_in_lock);
 		}
 
-		eventhandler(env);
 
 		f = get_video_frames(env, &p);	/* read and display */
 		if (!f)