goom: port goom

gst/goom/gstgoom.c

 /* gstgoom.c: implementation of goom drawing element
  * Copyright (C) <2001> Richard Boulton <richard@tartarus.org>
  *           (C) <2006> Wim Taymans <wim at fluendo dot com>
+ *           (C) <2011> Wim Taymans <wim.taymans at gmail dot com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -86,9 +87,6 @@ static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
     );
 
 
-static void gst_goom_class_init (GstGoomClass * klass);
-static void gst_goom_base_init (GstGoomClass * klass);
-static void gst_goom_init (GstGoom * goom);
 static void gst_goom_finalize (GObject * object);
 
 static GstStateChangeReturn gst_goom_change_state (GstElement * element,
@@ -100,48 +98,8 @@ static gboolean gst_goom_sink_event (GstPad * pad, GstEvent * event);
 
 static gboolean gst_goom_src_query (GstPad * pad, GstQuery * query);
 
-static gboolean gst_goom_sink_setcaps (GstPad * pad, GstCaps * caps);
-static gboolean gst_goom_src_setcaps (GstPad * pad, GstCaps * caps);
-
-static GstElementClass *parent_class = NULL;
-
-GType
-gst_goom_get_type (void)
-{
-  static GType type = 0;
-
-  if (!type) {
-    static const GTypeInfo info = {
-      sizeof (GstGoomClass),
-      (GBaseInitFunc) gst_goom_base_init,
-      NULL,
-      (GClassInitFunc) gst_goom_class_init,
-      NULL,
-      NULL,
-      sizeof (GstGoom),
-      0,
-      (GInstanceInitFunc) gst_goom_init,
-    };
-
-    type = g_type_register_static (GST_TYPE_ELEMENT, "GstGoom", &info, 0);
-  }
-  return type;
-}
-
-static void
-gst_goom_base_init (GstGoomClass * klass)
-{
-  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
-
-  gst_element_class_set_details_simple (element_class, "GOOM: what a GOOM!",
-      "Visualization",
-      "Takes frames of data and outputs video frames using the GOOM filter",
-      "Wim Taymans <wim@fluendo.com>");
-  gst_element_class_add_pad_template (element_class,
-      gst_static_pad_template_get (&sink_template));
-  gst_element_class_add_pad_template (element_class,
-      gst_static_pad_template_get (&src_template));
-}
+#define gst_goom_parent_class parent_class
+G_DEFINE_TYPE (GstGoom, gst_goom, GST_TYPE_ELEMENT);
 
 static void
 gst_goom_class_init (GstGoomClass * klass)
@@ -152,10 +110,17 @@ gst_goom_class_init (GstGoomClass * klass)
   gobject_class = (GObjectClass *) klass;
   gstelement_class = (GstElementClass *) klass;
 
-  parent_class = g_type_class_peek_parent (klass);
-
   gobject_class->finalize = gst_goom_finalize;
 
+  gst_element_class_set_details_simple (gstelement_class, "GOOM: what a GOOM!",
+      "Visualization",
+      "Takes frames of data and outputs video frames using the GOOM filter",
+      "Wim Taymans <wim@fluendo.com>");
+  gst_element_class_add_pad_template (gstelement_class,
+      gst_static_pad_template_get (&sink_template));
+  gst_element_class_add_pad_template (gstelement_class,
+      gst_static_pad_template_get (&src_template));
+
   gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_goom_change_state);
 }
 
@@ -168,13 +133,9 @@ gst_goom_init (GstGoom * goom)
       GST_DEBUG_FUNCPTR (gst_goom_chain));
   gst_pad_set_event_function (goom->sinkpad,
       GST_DEBUG_FUNCPTR (gst_goom_sink_event));
-  gst_pad_set_setcaps_function (goom->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_goom_sink_setcaps));
   gst_element_add_pad (GST_ELEMENT (goom), goom->sinkpad);
 
   goom->srcpad = gst_pad_new_from_static_template (&src_template, "src");
-  gst_pad_set_setcaps_function (goom->srcpad,
-      GST_DEBUG_FUNCPTR (gst_goom_src_setcaps));
   gst_pad_set_event_function (goom->srcpad,
       GST_DEBUG_FUNCPTR (gst_goom_src_event));
   gst_pad_set_query_function (goom->srcpad,
@@ -203,6 +164,8 @@ gst_goom_finalize (GObject * object)
   goom->plugin = NULL;
 
   g_object_unref (goom->adapter);
+  if (goom->pool)
+    gst_object_unref (goom->pool);
 
   G_OBJECT_CLASS (parent_class)->finalize (object);
 }
@@ -220,14 +183,11 @@ gst_goom_reset (GstGoom * goom)
 }
 
 static gboolean
-gst_goom_sink_setcaps (GstPad * pad, GstCaps * caps)
+gst_goom_sink_setcaps (GstGoom * goom, GstCaps * caps)
 {
-  GstGoom *goom;
   GstStructure *structure;
   gboolean res;
 
-  goom = GST_GOOM (GST_PAD_PARENT (pad));
-
   structure = gst_caps_get_structure (caps, 0);
 
   res = gst_structure_get_int (structure, "channels", &goom->channels);
@@ -235,24 +195,21 @@ gst_goom_sink_setcaps (GstPad * pad, GstCaps * caps)
 
   goom->bps = goom->channels * sizeof (gint16);
 
-  return res;
+  return TRUE;
 }
 
 static gboolean
-gst_goom_src_setcaps (GstPad * pad, GstCaps * caps)
+gst_goom_src_setcaps (GstGoom * goom, GstCaps * caps)
 {
-  GstGoom *goom;
   GstStructure *structure;
-
-  goom = GST_GOOM (GST_PAD_PARENT (pad));
+  gboolean res;
 
   structure = gst_caps_get_structure (caps, 0);
-
   if (!gst_structure_get_int (structure, "width", &goom->width) ||
       !gst_structure_get_int (structure, "height", &goom->height) ||
       !gst_structure_get_fraction (structure, "framerate", &goom->fps_n,
           &goom->fps_d))
-    return FALSE;
+    goto error;
 
   goom_set_resolution (goom->plugin, goom->width, goom->height);
 
@@ -266,32 +223,46 @@ gst_goom_src_setcaps (GstPad * pad, GstCaps * caps)
   GST_DEBUG_OBJECT (goom, "dimension %dx%d, framerate %d/%d, spf %d",
       goom->width, goom->height, goom->fps_n, goom->fps_d, goom->spf);
 
-  return TRUE;
+  res = gst_pad_push_event (goom->srcpad, gst_event_new_caps (caps));
+
+  return res;
+
+  /* ERRORS */
+error:
+  {
+    GST_DEBUG_OBJECT (goom, "error parsing caps");
+    return FALSE;
+  }
 }
 
 static gboolean
 gst_goom_src_negotiate (GstGoom * goom)
 {
+  gboolean res;
   GstCaps *othercaps, *target;
   GstStructure *structure;
-  const GstCaps *templ;
+  GstCaps *templ;
+  GstQuery *query;
+  GstBufferPool *pool = NULL;
+  guint size, min, max, prefix, alignment;
 
   templ = gst_pad_get_pad_template_caps (goom->srcpad);
 
   GST_DEBUG_OBJECT (goom, "performing negotiation");
 
   /* see what the peer can do */
-  othercaps = gst_pad_peer_get_caps (goom->srcpad);
+  othercaps = gst_pad_peer_get_caps (goom->srcpad, NULL);
   if (othercaps) {
     target = gst_caps_intersect (othercaps, templ);
     gst_caps_unref (othercaps);
+    gst_caps_unref (templ);
 
     if (gst_caps_is_empty (target))
       goto no_format;
 
     gst_caps_truncate (target);
   } else {
-    target = gst_caps_ref ((GstCaps *) templ);
+    target = templ;
   }
 
   structure = gst_caps_get_structure (target, 0);
@@ -300,7 +271,42 @@ gst_goom_src_negotiate (GstGoom * goom)
   gst_structure_fixate_field_nearest_fraction (structure, "framerate",
       DEFAULT_FPS_N, DEFAULT_FPS_D);
 
-  gst_pad_set_caps (goom->srcpad, target);
+  res = gst_goom_src_setcaps (goom, target);
+
+  /* try to get a bufferpool now */
+  /* find a pool for the negotiated caps now */
+  query = gst_query_new_allocation (target, TRUE);
+
+  if (gst_pad_peer_query (goom->srcpad, query)) {
+    /* we got configuration from our peer, parse them */
+    gst_query_parse_allocation_params (query, &size, &min, &max, &prefix,
+        &alignment, &pool);
+  } else {
+    size = goom->outsize;
+    min = max = 0;
+    prefix = 0;
+    alignment = 1;
+  }
+
+  if (pool == NULL) {
+    GstStructure *config;
+
+    /* we did not get a pool, make one ourselves then */
+    pool = gst_buffer_pool_new ();
+
+    config = gst_buffer_pool_get_config (pool);
+    gst_buffer_pool_config_set (config, target, size, min, max, prefix, 0,
+        alignment);
+    gst_buffer_pool_set_config (pool, config);
+  }
+
+  if (goom->pool)
+    gst_object_unref (goom->pool);
+  goom->pool = pool;
+
+  /* and activate */
+  gst_buffer_pool_set_active (pool, TRUE);
+
   gst_caps_unref (target);
 
   return TRUE;
@@ -327,7 +333,7 @@ gst_goom_src_event (GstPad * pad, GstEvent * event)
       GstClockTimeDiff diff;
       GstClockTime timestamp;
 
-      gst_event_parse_qos (event, &proportion, &diff, &timestamp);
+      gst_event_parse_qos (event, NULL, &proportion, &diff, &timestamp);
 
       /* save stuff for the _chain() function */
       GST_OBJECT_LOCK (goom);
@@ -361,6 +367,14 @@ gst_goom_sink_event (GstPad * pad, GstEvent * event)
   goom = GST_GOOM (gst_pad_get_parent (pad));
 
   switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_CAPS:
+    {
+      GstCaps *caps;
+
+      gst_event_parse_caps (event, &caps);
+      res = gst_goom_sink_setcaps (goom, caps);
+      break;
+    }
     case GST_EVENT_FLUSH_START:
       res = gst_pad_push_event (goom->srcpad, event);
       break;
@@ -368,22 +382,12 @@ gst_goom_sink_event (GstPad * pad, GstEvent * event)
       gst_goom_reset (goom);
       res = gst_pad_push_event (goom->srcpad, event);
       break;
-    case GST_EVENT_NEWSEGMENT:
+    case GST_EVENT_SEGMENT:
     {
-      GstFormat format;
-      gdouble rate, arate;
-      gint64 start, stop, time;
-      gboolean update;
-
       /* the newsegment values are used to clip the input samples
        * and to convert the incomming timestamps to running time so
        * we can do QoS */
-      gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
-          &start, &stop, &time);
-
-      /* now configure the values */
-      gst_segment_set_newsegment_full (&goom->segment, update,
-          rate, arate, format, start, stop, time);
+      gst_event_copy_segment (event, &goom->segment);
 
       res = gst_pad_push_event (goom->srcpad, event);
       break;
@@ -454,29 +458,26 @@ gst_goom_src_query (GstPad * pad, GstQuery * query)
   return res;
 }
 
+/* make sure we are negotiated */
 static GstFlowReturn
-get_buffer (GstGoom * goom, GstBuffer ** outbuf)
+ensure_negotiated (GstGoom * goom)
 {
-  GstFlowReturn ret;
+  gboolean reconfigure;
+
+  GST_OBJECT_LOCK (goom->srcpad);
+  reconfigure = GST_PAD_NEEDS_RECONFIGURE (goom->srcpad);
+  GST_OBJECT_FLAG_UNSET (goom->srcpad, GST_PAD_NEED_RECONFIGURE);
+  GST_OBJECT_UNLOCK (goom->srcpad);
 
-  if (GST_PAD_CAPS (goom->srcpad) == NULL) {
+  /* we don't know an output format yet, pick one */
+  if (reconfigure || !gst_pad_has_current_caps (goom->srcpad)) {
     if (!gst_goom_src_negotiate (goom))
       return GST_FLOW_NOT_NEGOTIATED;
   }
-
-  GST_DEBUG_OBJECT (goom, "allocating output buffer with caps %"
-      GST_PTR_FORMAT, GST_PAD_CAPS (goom->srcpad));
-
-  ret =
-      gst_pad_alloc_buffer_and_set_caps (goom->srcpad,
-      GST_BUFFER_OFFSET_NONE, goom->outsize,
-      GST_PAD_CAPS (goom->srcpad), outbuf);
-  if (ret != GST_FLOW_OK)
-    return ret;
-
   return GST_FLOW_OK;
 }
 
+
 static GstFlowReturn
 gst_goom_chain (GstPad * pad, GstBuffer * buffer)
 {
@@ -490,14 +491,11 @@ gst_goom_chain (GstPad * pad, GstBuffer * buffer)
     goto beach;
   }
 
-  /* If we don't have an output format yet, preallocate a buffer to try and
-   * set one */
-  if (GST_PAD_CAPS (goom->srcpad) == NULL) {
-    ret = get_buffer (goom, &outbuf);
-    if (ret != GST_FLOW_OK) {
-      gst_buffer_unref (buffer);
-      goto beach;
-    }
+  /* Make sure have an output format */
+  ret = ensure_negotiated (goom);
+  if (ret != GST_FLOW_OK) {
+    gst_buffer_unref (buffer);
+    goto beach;
   }
 
   /* don't try to combine samples from discont buffer */
@@ -507,7 +505,7 @@ gst_goom_chain (GstPad * pad, GstBuffer * buffer)
 
   GST_DEBUG_OBJECT (goom,
       "Input buffer has %d samples, time=%" G_GUINT64_FORMAT,
-      GST_BUFFER_SIZE (buffer) / goom->bps, GST_BUFFER_TIMESTAMP (buffer));
+      gst_buffer_get_size (buffer) / goom->bps, GST_BUFFER_TIMESTAMP (buffer));
 
   /* Collect samples until we have enough for an output frame */
   gst_adapter_push (goom->adapter, buffer);
@@ -565,7 +563,7 @@ gst_goom_chain (GstPad * pad, GstBuffer * buffer)
 
     /* get next GOOM_SAMPLES, we have at least this amount of samples */
     data =
-        (const guint16 *) gst_adapter_peek (goom->adapter,
+        (const guint16 *) gst_adapter_map (goom->adapter,
         GOOM_SAMPLES * goom->bps);
 
     if (goom->channels == 2) {
@@ -583,18 +581,21 @@ gst_goom_chain (GstPad * pad, GstBuffer * buffer)
     /* alloc a buffer if we don't have one yet, this happens
      * when we pushed a buffer in this while loop before */
     if (outbuf == NULL) {
-      ret = get_buffer (goom, &outbuf);
+      GST_DEBUG_OBJECT (goom, "allocating output buffer");
+      ret = gst_buffer_pool_acquire_buffer (goom->pool, &outbuf, NULL);
       if (ret != GST_FLOW_OK) {
+        gst_adapter_unmap (goom->adapter, 0);
         goto beach;
       }
     }
 
     GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
     GST_BUFFER_DURATION (outbuf) = goom->duration;
-    GST_BUFFER_SIZE (outbuf) = goom->outsize;
 
     out_frame = (guchar *) goom_update (goom->plugin, goom->datain, 0, 0);
-    memcpy (GST_BUFFER_DATA (outbuf), out_frame, goom->outsize);
+    gst_buffer_fill (outbuf, 0, out_frame, goom->outsize);
+
+    gst_adapter_unmap (goom->adapter, 0);
 
     GST_DEBUG ("Pushing frame with time=%" GST_TIME_FORMAT ", duration=%"
         GST_TIME_FORMAT, GST_TIME_ARGS (timestamp),
@@ -645,6 +646,11 @@ gst_goom_change_state (GstElement * element, GstStateChange transition)
 
   switch (transition) {
     case GST_STATE_CHANGE_PAUSED_TO_READY:
+      if (goom->pool) {
+        gst_buffer_pool_set_active (goom->pool, FALSE);
+        gst_object_unref (goom->pool);
+        goom->pool = NULL;
+      }
       break;
     case GST_STATE_CHANGE_READY_TO_NULL:
       break;

gst/goom/gstgoom.h

@@ -57,6 +57,7 @@ struct _GstGoom
   gint height;
   GstClockTime duration;
   guint outsize;
+  GstBufferPool *pool;
 
   /* samples per frame */
   guint spf;