Rework caps negotiation in the element so that it works again.

Original commit message from CVS:
Rework caps negotiation in the element so that it works again.

2 files changed, 119 insertions, 83 deletions

diff --git a/ext/dv/gstdvdec.c b/ext/dv/gstdvdec.c
index c18bf590..c88c1b1d 100644
--- a/ext/dv/gstdvdec.c
+++ b/ext/dv/gstdvdec.c
@@ -93,12 +93,12 @@ GST_STATIC_PAD_TEMPLATE
     "format = (fourcc) YUY2, " 
     "width = (int) 720, "
     "height = (int) { " 
-    	G_STRINGIFY(NTSC_HEIGHT) ", "
-	G_STRINGIFY(PAL_HEIGHT)
+      G_STRINGIFY(NTSC_HEIGHT) ", "
+      G_STRINGIFY(PAL_HEIGHT)
     " }, "
     "framerate = (double) { "
-        G_STRINGIFY(PAL_FRAMERATE) ", "
-	G_STRINGIFY(NTSC_FRAMERATE) 
+      G_STRINGIFY(PAL_FRAMERATE) ", "
+      G_STRINGIFY(NTSC_FRAMERATE) 
     " }; "
 
     "video/x-raw-rgb, "
@@ -186,6 +186,10 @@ static gboolean 	gst_dvdec_sink_convert 		(GstPad *pad, GstFormat src_format, gi
 static gboolean 	gst_dvdec_src_convert 		(GstPad *pad, GstFormat src_format, gint64 src_value,
                       					 GstFormat *dest_format, gint64 *dest_value);
 
+static GstPadLinkReturn gst_dvdec_video_link (GstPad          *pad,
+                                              const GstCaps   *caps);
+static GstCaps*   gst_dvdec_video_getcaps   (GstPad       *pad);
+       
 static const GstEventMask*
 			gst_dvdec_get_event_masks 	(GstPad *pad);
 static gboolean 	gst_dvdec_handle_src_event 	(GstPad *pad, GstEvent *event);
@@ -310,22 +314,25 @@ gst_dvdec_init(GstDVDec *dvdec)
   gst_pad_set_formats_function (dvdec->sinkpad, GST_DEBUG_FUNCPTR (gst_dvdec_get_formats));
 
   dvdec->videosrcpad = gst_pad_new_from_template (gst_static_pad_template_get (&video_src_temp), "video");
-  gst_element_add_pad (GST_ELEMENT (dvdec), dvdec->videosrcpad);
   gst_pad_set_query_function (dvdec->videosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_src_query));
   gst_pad_set_query_type_function (dvdec->videosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_get_src_query_types));
   gst_pad_set_event_function (dvdec->videosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_handle_src_event));
   gst_pad_set_event_mask_function (dvdec->videosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_get_event_masks));
   gst_pad_set_convert_function (dvdec->videosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_src_convert));
   gst_pad_set_formats_function (dvdec->videosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_get_formats));
-
+  gst_pad_set_link_function (dvdec->videosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_video_link));
+  gst_pad_set_getcaps_function (dvdec->videosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_video_getcaps));
+  gst_element_add_pad (GST_ELEMENT (dvdec), dvdec->videosrcpad);
+  
   dvdec->audiosrcpad = gst_pad_new_from_template (gst_static_pad_template_get (&audio_src_temp), "audio");
-  gst_element_add_pad(GST_ELEMENT(dvdec),dvdec->audiosrcpad);
   gst_pad_set_query_function (dvdec->audiosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_src_query));
   gst_pad_set_query_type_function (dvdec->audiosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_get_src_query_types));
   gst_pad_set_event_function (dvdec->audiosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_handle_src_event));
   gst_pad_set_event_mask_function (dvdec->audiosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_get_event_masks));
   gst_pad_set_convert_function (dvdec->audiosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_src_convert));
   gst_pad_set_formats_function (dvdec->audiosrcpad, GST_DEBUG_FUNCPTR (gst_dvdec_get_formats));
+  gst_pad_use_explicit_caps (dvdec->audiosrcpad);
+  gst_element_add_pad (GST_ELEMENT(dvdec), dvdec->audiosrcpad);
 
   gst_element_set_loop_function (GST_ELEMENT (dvdec), gst_dvdec_loop);
 
@@ -335,11 +342,15 @@ gst_dvdec_init(GstDVDec *dvdec)
   dvdec->need_discont = FALSE;
   dvdec->framerate = 0;
   dvdec->height = 0;
+  dvdec->frequency = 0;
+  dvdec->channels = 0;
+  
   dvdec->clamp_luma = FALSE;
   dvdec->clamp_chroma = FALSE;
   dvdec->quality = DV_QUALITY_BEST;
   dvdec->loop = FALSE;
-
+  dvdec->found_header = FALSE;
+  
   for (i = 0; i <4; i++) {
     dvdec->audio_buffers[i] = (gint16 *)g_malloc (DV_AUDIO_MAX_SAMPLES * sizeof (gint16));
   }
@@ -657,6 +668,92 @@ gst_dvdec_handle_src_event (GstPad *pad, GstEvent *event)
   return res;
 }
 
+static GstCaps*   
+gst_dvdec_video_getcaps (GstPad *pad)
+{
+    GstDVDec *dvdec;
+    GstCaps *caps;
+    GstPadTemplate *src_pad_template;
+    
+    dvdec = GST_DVDEC (gst_pad_get_parent (pad));
+    src_pad_template = gst_static_pad_template_get (&video_src_temp);
+    caps = gst_caps_copy(gst_pad_template_get_caps (src_pad_template));
+    
+    if (dvdec->found_header)
+    {
+      int i;
+      
+      /* set the height */
+      for (i = 0; i < gst_caps_get_size (caps); i++)
+      {
+      	GstStructure *structure = gst_caps_get_structure (caps, i);
+      	gst_structure_set(structure, 
+      	        "height", G_TYPE_INT, dvdec->height,
+                "framerate", G_TYPE_DOUBLE, dvdec->, NULL
+      	      );
+      }
+    }
+    
+    return caps;
+}
+
+static GstPadLinkReturn 
+gst_dvdec_video_link (GstPad *pad, const GstCaps *caps)
+{
+  /* if we did not find a header yet, return delayed */
+  if (!dvdec->found_header)
+    return GST_PAD_LINK_DELAYED;
+    
+
+
+    for (i=0; i < gst_caps_get_size(caps); i++) {
+      GstStructure *to_try_struct = gst_caps_get_structure (caps, i);
+      GstCaps *try_caps = 
+        gst_caps_new_full (gst_structure_copy(to_try_struct), NULL);
+
+      /* try each format */
+      if (gst_pad_try_set_caps (dvdec->videosrcpad, try_caps) > 0) {
+        negotiated_caps = try_caps;
+        break;
+      }
+
+      gst_caps_free(try_caps);
+    }
+
+    gst_caps_free (caps);
+
+    /* Check if we negotiated caps successfully */
+    if (negotiated_caps != NULL) {
+        GstStructure *structure = gst_caps_get_structure (negotiated_caps, 0);
+        guint32 fourcc;
+
+	/* it worked, try to find what it was again */
+	gst_structure_get_fourcc (structure, "format", &fourcc);
+
+	if (fourcc == GST_STR_FOURCC ("RGB ")) {
+          gint bpp;
+
+	  gst_structure_get_int (structure, "bpp", &bpp);
+	  if (bpp == 24) {
+            dvdec->space = e_dv_color_rgb;
+            dvdec->bpp = 3;
+	  }
+	  else {
+            dvdec->space = e_dv_color_bgr0;
+            dvdec->bpp = 4;
+	  }
+	}
+	else {
+          dvdec->space = e_dv_color_yuv;
+          dvdec->bpp = 2;
+	}
+    } else {
+      GST_ELEMENT_ERROR (element, CORE, NEGOTIATION, (NULL), (NULL));
+      return;
+    }
+  }
+}
+
 static void
 gst_dvdec_push (GstDVDec *dvdec, GstBuffer *outbuf, GstPad *pad, GstClockTime ts)
 {   
@@ -691,6 +788,7 @@ gst_dvdec_loop (GstElement *element)
   GstFormat format;
   guint64 ts;
   gfloat fps;
+  const GstCaps *cur_caps;
 
   dvdec = GST_DVDEC (element);
 
@@ -701,11 +799,11 @@ gst_dvdec_loop (GstElement *element)
     return;
   }
   dv_parse_header (dvdec->decoder, inframe);
-  /* after parsing the header we know the size of the data */
+  
+  /* after parsing the header we know the length of the data */
   dvdec->PAL = dv_system_50_fields (dvdec->decoder);
 
-  dvdec->framerate = (dvdec->PAL ? 2500 : 2997);
-  fps = (dvdec->PAL ? PAL_FRAMERATE : NTSC_FRAMERATE);
+  dvdec->framerate = fps = (dvdec->PAL ? PAL_FRAMERATE : NTSC_FRAMERATE);
   dvdec->height = height = (dvdec->PAL ? PAL_HEIGHT : NTSC_HEIGHT);
   length = (dvdec->PAL ? PAL_BUFFER : NTSC_BUFFER);
 
@@ -721,77 +819,10 @@ gst_dvdec_loop (GstElement *element)
     return;
   }
 
-  /* if we did not negotiate yet, do it now */
-  if (!GST_PAD_CAPS (dvdec->videosrcpad)) {
-    GstCaps *caps = NULL;
-    GstCaps *negotiated_caps = NULL;
-    GstPadTemplate *src_pad_template;
-    int i;
-    
-    /* try to fix our height */
-    src_pad_template = gst_static_pad_template_get (&video_src_temp);
-    caps = gst_caps_copy(gst_pad_template_get_caps (src_pad_template));
-
-    for (i = 0; i < gst_caps_get_size (caps); i++)
-    {
-	GstStructure *structure = gst_caps_get_structure (caps, i);
-	gst_structure_set(structure, 
-	        "height", G_TYPE_INT, height,
-                "framerate", G_TYPE_INT, fps, NULL
-	      );
-    }
-
-    for (i=0; i < gst_caps_get_size(caps); i++) {
-      GstStructure *to_try_struct = gst_caps_get_structure (caps, i);
-      GstCaps *try_caps = 
-        gst_caps_new_full (gst_structure_copy(to_try_struct), NULL);
-
-      /* try each format */
-      if (gst_pad_try_set_caps (dvdec->videosrcpad, try_caps) > 0) {
-        negotiated_caps = try_caps;
-        break;
-      }
-
-      gst_caps_free(try_caps);
-    }
-
-    gst_caps_free (caps);
-
-    /* Check if we negotiated caps successfully */
-    if (negotiated_caps != NULL) {
-        GstStructure *structure = gst_caps_get_structure (negotiated_caps, 0);
-        guint32 fourcc;
-
-	/* it worked, try to find what it was again */
-	gst_structure_get_fourcc (structure, "format", &fourcc);
-
-	if (fourcc == GST_STR_FOURCC ("RGB ")) {
-          gint bpp;
-
-	  gst_structure_get_int (structure, "bpp", &bpp);
-	  if (bpp == 24) {
-            dvdec->space = e_dv_color_rgb;
-            dvdec->bpp = 3;
-	  }
-	  else {
-            dvdec->space = e_dv_color_bgr0;
-            dvdec->bpp = 4;
-	  }
-	}
-	else {
-          dvdec->space = e_dv_color_yuv;
-          dvdec->bpp = 2;
-	}
-    } else {
-      GST_ELEMENT_ERROR (element, CORE, NEGOTIATION, (NULL), (NULL));
-      return;
-    }
-  }
-
   format = GST_FORMAT_TIME;
   gst_pad_query (dvdec->videosrcpad, GST_QUERY_POSITION, &format, &ts);
 
-  dvdec->next_ts += (GST_SECOND*100) / dvdec->framerate;
+  dvdec->next_ts += GST_SECOND / dvdec->framerate;
 
   if (GST_PAD_IS_LINKED (dvdec->audiosrcpad)) {
     gint16 *a_ptr;
@@ -801,7 +832,7 @@ gst_dvdec_loop (GstElement *element)
 
     /* if we did not negotiate yet, do it now */
     if (!GST_PAD_CAPS (dvdec->audiosrcpad)) {
-      gst_pad_try_set_caps (dvdec->audiosrcpad,
+      gst_pad_set_explicit_caps (dvdec->audiosrcpad,
 	gst_caps_new_simple (
 	  "audio/x-raw-int", 
     	    "rate", G_TYPE_INT, dvdec->decoder->audio->frequency,
diff --git a/ext/dv/gstdvdec.h b/ext/dv/gstdvdec.h
index c360db31..4dffd96f 100644
--- a/ext/dv/gstdvdec.h
+++ b/ext/dv/gstdvdec.h
@@ -46,7 +46,7 @@ struct _GstDVDec {
   /* We need to keep track of our pads, so we do so here. */
   GstPad 	*sinkpad,
   		*videosrcpad,
-		*audiosrcpad;
+		  *audiosrcpad;
 
   dv_decoder_t 	*decoder;
   gboolean	 clamp_luma;
@@ -56,14 +56,19 @@ struct _GstDVDec {
   GstByteStream *bs;
   dv_color_space_t space;
   gint 		 bpp;
-  gboolean	 PAL;
-  gint		 framerate;
+  gboolean PAL;
+  gdouble	 framerate;
   gint		 height;
+  gint     frequency;
+  gint     channels;
+  
   gint 		 length;
   guint64	 next_ts;
   guint64	 end_position;
   gboolean	 need_discont;
   gboolean	 loop;
+  
+  gboolean found_header;
 
   gint16 	*audio_buffers[4];
 };