ext/libpng/gstpngdec.*: Don't release the png-memory from within the callback.

Original commit message from CVS:
* ext/libpng/gstpngdec.c:
* ext/libpng/gstpngdec.h:
Don't release the png-memory from within the callback.

ChangeLog

+2007-11-20  Stefan Kost  <ensonic@users.sf.net>
+
+	* ext/libpng/gstpngdec.c:
+	* ext/libpng/gstpngdec.h:
+	  Don't release the png-memory from within the callback.
+
 2007-11-20  Stefan Kost  <ensonic@users.sf.net>
 	Patch by: René Stadler <mail at renestadler dot de>

ext/libpng/gstpngdec.c

@@ -168,6 +168,8 @@ gst_pngdec_init (GstPngDec * pngdec)
   pngdec->in_duration = GST_CLOCK_TIME_NONE;
 
   gst_segment_init (&pngdec->segment, GST_FORMAT_UNDEFINED);
+
+  pngdec->image_ready = FALSE;
 }
 
 static void
@@ -292,18 +294,7 @@ user_end_callback (png_structp png_ptr, png_infop info)
     gst_buffer_unref (pngdec->buffer_out);
   }
   pngdec->buffer_out = NULL;
-
-  if (pngdec->framed) {
-    /* Reset ourselves for the next frame */
-    gst_pngdec_libpng_clear (pngdec);
-    gst_pngdec_libpng_init (pngdec);
-    GST_LOG_OBJECT (pngdec, "setting up callbacks for next frame");
-    png_set_progressive_read_fn (pngdec->png, pngdec,
-        user_info_callback, user_endrow_callback, user_end_callback);
-  } else {
-    GST_LOG_OBJECT (pngdec, "sending EOS");
-    pngdec->ret = gst_pad_push_event (pngdec->srcpad, gst_event_new_eos ());
-  }
+  pngdec->image_ready = TRUE;
 }
 
 static void
@@ -564,6 +555,21 @@ gst_pngdec_chain (GstPad * pad, GstBuffer * buffer)
   png_process_data (pngdec->png, pngdec->info, GST_BUFFER_DATA (buffer),
       GST_BUFFER_SIZE (buffer));
 
+  if (pngdec->image_ready) {
+    if (pngdec->framed) {
+      /* Reset ourselves for the next frame */
+      gst_pngdec_libpng_clear (pngdec);
+      gst_pngdec_libpng_init (pngdec);
+      GST_LOG_OBJECT (pngdec, "setting up callbacks for next frame");
+      png_set_progressive_read_fn (pngdec->png, pngdec,
+          user_info_callback, user_endrow_callback, user_end_callback);
+    } else {
+      GST_LOG_OBJECT (pngdec, "sending EOS");
+      pngdec->ret = gst_pad_push_event (pngdec->srcpad, gst_event_new_eos ());
+    }
+    pngdec->image_ready = FALSE;
+  }
+
   /* grab new return code */
   ret = pngdec->ret;
 

ext/libpng/gstpngdec.h

@@ -69,6 +69,7 @@ struct _GstPngDec
   GstClockTime in_duration;
 
   GstSegment segment;
+  gboolean image_ready;
 };
 
 struct _GstPngDecClass