chopmydata: Add new element

This element splits up a stream into randomly-sized buffers.
Useful (maybe) for testing parsers.

gst/debugutils/Makefile.am

@@ -18,7 +18,9 @@ libgstdebugutilsbad_la_SOURCES = \
 	fpsdisplaysink.c \
 	debugutilsbad.c \
 	gstchecksumsink.c \
-	gstchecksumsink.h
+	gstchecksumsink.h \
+	gstchopmydata.c \
+	gstchopmydata.h
 nodist_libgstdebugutilsbad_la_SOURCES = $(BUILT_SOURCES)
 libgstdebugutilsbad_la_CFLAGS = $(GST_CFLAGS) $(GST_BASE_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS)
 libgstdebugutilsbad_la_LIBADD = $(GST_BASE_LIBS) $(GST_PLUGINS_BASE_LIBS) \

gst/debugutils/debugutilsbad.c

@@ -25,6 +25,7 @@
 
 GType gst_checksum_sink_get_type (void);
 GType fps_display_sink_get_type (void);
+GType gst_chop_my_data_get_type (void);
 
 static gboolean
 plugin_init (GstPlugin * plugin)
@@ -33,6 +34,8 @@ plugin_init (GstPlugin * plugin)
       gst_checksum_sink_get_type ());
   gst_element_register (plugin, "fpsdisplaysink", GST_RANK_NONE,
       fps_display_sink_get_type ());
+  gst_element_register (plugin, "chopmydata", GST_RANK_NONE,
+      gst_chop_my_data_get_type ());
   return TRUE;
 }
 

gst/debugutils/gstchopmydata.c

@@ -0,0 +1,414 @@
+/* GStreamer
+ * Copyright (C) 2010 David Schleef <ds@schleef.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+/**
+ * SECTION:element-gstchopmydata
+ *
+ * The chopmydata element takes an incoming stream and chops it up
+ * into randomly sized buffers.  Size of outgoing buffers are determined
+ * by the max-size, min-size, and step-size properties.
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch -v audiotestsrc num-buffers=10 ! gstchopmydata min-size=100
+ * max-size=200 step-size=2 ! fakesink -v
+ * ]|
+ * 
+ * This pipeline will create 10 buffers that are by default 2048 bytes
+ * each (1024 samples each), and chop them up into buffers that range
+ * in size from 100 bytes to 200 bytes, with the restriction that sizes
+ * are a multiple of 2.  This restriction is important, because the
+ * default sample size for audiotestsrc is 2 bytes (one channel, 16-bit
+ * audio).
+ * 
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <gst/gst.h>
+#include "gstchopmydata.h"
+
+/* prototypes */
+
+
+static void gst_chop_my_data_set_property (GObject * object,
+    guint property_id, const GValue * value, GParamSpec * pspec);
+static void gst_chop_my_data_get_property (GObject * object,
+    guint property_id, GValue * value, GParamSpec * pspec);
+static void gst_chop_my_data_dispose (GObject * object);
+static void gst_chop_my_data_finalize (GObject * object);
+
+static GstStateChangeReturn
+gst_chop_my_data_change_state (GstElement * element, GstStateChange transition);
+
+static GstFlowReturn gst_chop_my_data_chain (GstPad * pad, GstBuffer * buffer);
+static gboolean gst_chop_my_data_sink_event (GstPad * pad, GstEvent * event);
+static gboolean gst_chop_my_data_src_event (GstPad * pad, GstEvent * event);
+
+#define DEFAULT_MAX_SIZE 4096
+#define DEFAULT_MIN_SIZE 1
+#define DEFAULT_STEP_SIZE 1
+
+enum
+{
+  PROP_0,
+  PROP_MAX_SIZE,
+  PROP_MIN_SIZE,
+  PROP_STEP_SIZE
+};
+
+/* pad templates */
+
+static GstStaticPadTemplate gst_chop_my_data_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+static GstStaticPadTemplate gst_chop_my_data_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+/* class initialization */
+
+GST_BOILERPLATE (GstChopMyData, gst_chop_my_data, GstElement, GST_TYPE_ELEMENT);
+
+static void
+gst_chop_my_data_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_chop_my_data_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_chop_my_data_sink_template));
+
+  gst_element_class_set_details_simple (element_class, "FIXME",
+      "Generic", "FIXME", "David Schleef <ds@schleef.org>");
+}
+
+static void
+gst_chop_my_data_class_init (GstChopMyDataClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gobject_class->set_property = gst_chop_my_data_set_property;
+  gobject_class->get_property = gst_chop_my_data_get_property;
+  gobject_class->dispose = gst_chop_my_data_dispose;
+  gobject_class->finalize = gst_chop_my_data_finalize;
+  element_class->change_state =
+      GST_DEBUG_FUNCPTR (gst_chop_my_data_change_state);
+
+  g_object_class_install_property (gobject_class, PROP_MAX_SIZE,
+      g_param_spec_int ("max-size", "max-size",
+          "Maximum size of outgoing buffers", 1, G_MAXINT,
+          DEFAULT_MAX_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_MIN_SIZE,
+      g_param_spec_int ("min-size", "max-size",
+          "Minimum size of outgoing buffers", 1, G_MAXINT,
+          DEFAULT_MIN_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_STEP_SIZE,
+      g_param_spec_int ("step-size", "step-size",
+          "Step increment for random buffer sizes", 1, G_MAXINT,
+          DEFAULT_MAX_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+}
+
+static void
+gst_chop_my_data_init (GstChopMyData * chopmydata,
+    GstChopMyDataClass * chopmydata_class)
+{
+
+  chopmydata->sinkpad =
+      gst_pad_new_from_static_template (&gst_chop_my_data_sink_template,
+      "sink");
+  gst_pad_set_event_function (chopmydata->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_chop_my_data_sink_event));
+  gst_pad_set_chain_function (chopmydata->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_chop_my_data_chain));
+  gst_pad_set_getcaps_function (chopmydata->sinkpad, gst_pad_proxy_getcaps);
+  gst_pad_set_setcaps_function (chopmydata->sinkpad, gst_pad_proxy_setcaps);
+  gst_element_add_pad (GST_ELEMENT (chopmydata), chopmydata->sinkpad);
+
+  chopmydata->srcpad =
+      gst_pad_new_from_static_template (&gst_chop_my_data_src_template, "src");
+  gst_pad_set_event_function (chopmydata->srcpad,
+      GST_DEBUG_FUNCPTR (gst_chop_my_data_src_event));
+  gst_pad_set_getcaps_function (chopmydata->srcpad, gst_pad_proxy_getcaps);
+  gst_pad_set_setcaps_function (chopmydata->srcpad, gst_pad_proxy_setcaps);
+  gst_element_add_pad (GST_ELEMENT (chopmydata), chopmydata->srcpad);
+
+  chopmydata->step_size = DEFAULT_STEP_SIZE;
+  chopmydata->min_size = DEFAULT_MIN_SIZE;
+  chopmydata->max_size = DEFAULT_MAX_SIZE;
+}
+
+void
+gst_chop_my_data_set_property (GObject * object, guint property_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstChopMyData *chopmydata;
+
+  g_return_if_fail (GST_IS_CHOP_MY_DATA (object));
+  chopmydata = GST_CHOP_MY_DATA (object);
+
+  switch (property_id) {
+    case PROP_MAX_SIZE:
+      chopmydata->max_size = g_value_get_int (value);
+      break;
+    case PROP_MIN_SIZE:
+      chopmydata->min_size = g_value_get_int (value);
+      break;
+    case PROP_STEP_SIZE:
+      chopmydata->step_size = g_value_get_int (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+  }
+}
+
+void
+gst_chop_my_data_get_property (GObject * object, guint property_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstChopMyData *chopmydata;
+
+  g_return_if_fail (GST_IS_CHOP_MY_DATA (object));
+  chopmydata = GST_CHOP_MY_DATA (object);
+
+  switch (property_id) {
+    case PROP_MAX_SIZE:
+      g_value_set_int (value, chopmydata->max_size);
+      break;
+    case PROP_MIN_SIZE:
+      g_value_set_int (value, chopmydata->min_size);
+      break;
+    case PROP_STEP_SIZE:
+      g_value_set_int (value, chopmydata->step_size);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+  }
+}
+
+void
+gst_chop_my_data_dispose (GObject * object)
+{
+  GstChopMyData *chopmydata;
+
+  g_return_if_fail (GST_IS_CHOP_MY_DATA (object));
+  chopmydata = GST_CHOP_MY_DATA (object);
+
+  /* clean up as possible.  may be called multiple times */
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+void
+gst_chop_my_data_finalize (GObject * object)
+{
+  GstChopMyData *chopmydata;
+
+  g_return_if_fail (GST_IS_CHOP_MY_DATA (object));
+  chopmydata = GST_CHOP_MY_DATA (object);
+
+  /* clean up object here */
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static GstStateChangeReturn
+gst_chop_my_data_change_state (GstElement * element, GstStateChange transition)
+{
+  GstChopMyData *chopmydata;
+  GstStateChangeReturn ret;
+
+  chopmydata = GST_CHOP_MY_DATA (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      break;
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      GST_OBJECT_LOCK (chopmydata);
+      chopmydata->adapter = gst_adapter_new ();
+      chopmydata->rand = g_rand_new ();
+      chopmydata->next_size = 0;
+      GST_OBJECT_UNLOCK (chopmydata);
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
+      break;
+    default:
+      break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      GST_OBJECT_LOCK (chopmydata);
+      g_object_unref (chopmydata->adapter);
+      chopmydata->adapter = NULL;
+      g_rand_free (chopmydata->rand);
+      GST_OBJECT_UNLOCK (chopmydata);
+      break;
+    case GST_STATE_CHANGE_READY_TO_NULL:
+      break;
+    default:
+      break;
+  }
+
+  return ret;
+}
+
+static void
+get_next_size (GstChopMyData * chopmydata)
+{
+  int begin;
+  int end;
+
+  begin = (chopmydata->min_size + chopmydata->step_size - 1) /
+      chopmydata->step_size;
+  end = (chopmydata->max_size + chopmydata->step_size) / chopmydata->step_size;
+
+  if (begin >= end) {
+    chopmydata->next_size = begin * chopmydata->step_size;
+    return;
+  }
+
+  chopmydata->next_size =
+      g_rand_int_range (chopmydata->rand, begin, end) * chopmydata->step_size;
+}
+
+static GstFlowReturn
+gst_chop_my_data_process (GstChopMyData * chopmydata, gboolean flush)
+{
+  GstFlowReturn ret = GST_FLOW_OK;
+  GstBuffer *buffer;
+
+  if (chopmydata->next_size == 0) {
+    get_next_size (chopmydata);
+  }
+
+  while (gst_adapter_available (chopmydata->adapter) >= chopmydata->next_size) {
+    buffer =
+        gst_adapter_take_buffer (chopmydata->adapter, chopmydata->next_size);
+
+    chopmydata->next_size = 0;
+
+    ret = gst_pad_push (chopmydata->srcpad, buffer);
+    if (ret != GST_FLOW_OK) {
+      return ret;
+    }
+
+    get_next_size (chopmydata);
+  }
+
+  if (flush) {
+    buffer = gst_adapter_take_buffer (chopmydata->adapter,
+        gst_adapter_available (chopmydata->adapter));
+    ret = gst_pad_push (chopmydata->srcpad, buffer);
+  }
+
+  return ret;
+}
+
+static GstFlowReturn
+gst_chop_my_data_chain (GstPad * pad, GstBuffer * buffer)
+{
+  GstChopMyData *chopmydata;
+  GstFlowReturn ret;
+
+  chopmydata = GST_CHOP_MY_DATA (gst_pad_get_parent (pad));
+
+  GST_DEBUG_OBJECT (chopmydata, "chain");
+
+  gst_adapter_push (chopmydata->adapter, buffer);
+  ret = gst_chop_my_data_process (chopmydata, FALSE);
+
+  gst_object_unref (chopmydata);
+  return ret;
+}
+
+static gboolean
+gst_chop_my_data_sink_event (GstPad * pad, GstEvent * event)
+{
+  GstFlowReturn ret = GST_FLOW_OK;
+  gboolean res;
+  GstChopMyData *chopmydata;
+
+  chopmydata = GST_CHOP_MY_DATA (gst_pad_get_parent (pad));
+
+  GST_DEBUG_OBJECT (chopmydata, "event");
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_FLUSH_START:
+      ret = gst_chop_my_data_process (chopmydata, TRUE);
+      res = gst_pad_push_event (chopmydata->srcpad, event);
+      break;
+    case GST_EVENT_FLUSH_STOP:
+      res = gst_pad_push_event (chopmydata->srcpad, event);
+      break;
+    case GST_EVENT_NEWSEGMENT:
+      res = gst_pad_push_event (chopmydata->srcpad, event);
+      break;
+    case GST_EVENT_EOS:
+      ret = gst_chop_my_data_process (chopmydata, TRUE);
+      res = gst_pad_push_event (chopmydata->srcpad, event);
+      break;
+    default:
+      res = gst_pad_push_event (chopmydata->srcpad, event);
+      break;
+  }
+
+  gst_object_unref (chopmydata);
+  return TRUE;
+}
+
+static gboolean
+gst_chop_my_data_src_event (GstPad * pad, GstEvent * event)
+{
+  gboolean res;
+  GstChopMyData *chopmydata;
+
+  chopmydata = GST_CHOP_MY_DATA (gst_pad_get_parent (pad));
+
+  GST_DEBUG_OBJECT (chopmydata, "event");
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_SEEK:
+      res = gst_pad_push_event (chopmydata->sinkpad, event);
+      break;
+    default:
+      res = gst_pad_push_event (chopmydata->sinkpad, event);
+      break;
+  }
+
+  gst_object_unref (chopmydata);
+  return TRUE;
+}

gst/debugutils/gstchopmydata.h

@@ -0,0 +1,65 @@
+/* GStreamer
+ * Copyright (C) 2010 REAL_NAME <EMAIL_ADDRESS>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _GST_CHOP_MY_DATA_H_
+#define _GST_CHOP_MY_DATA_H_
+
+#include <gst/gst.h>
+#include <gst/gst.h>
+#include <gst/base/gstadapter.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_CHOP_MY_DATA   (gst_chop_my_data_get_type())
+#define GST_CHOP_MY_DATA(obj)   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CHOP_MY_DATA,GstChopMyData))
+#define GST_CHOP_MY_DATA_CLASS(klass)   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CHOP_MY_DATA,GstChopMyDataClass))
+#define GST_IS_CHOP_MY_DATA(obj)   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CHOP_MY_DATA))
+#define GST_IS_CHOP_MY_DATA_CLASS(obj)   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CHOP_MY_DATA))
+
+typedef struct _GstChopMyData GstChopMyData;
+typedef struct _GstChopMyDataClass GstChopMyDataClass;
+
+struct _GstChopMyData
+{
+  GstElement base_chopmydata;
+
+  GstPad *srcpad;
+  GstPad *sinkpad;
+  GstAdapter *adapter;
+  GRand *rand;
+
+  /* properties */
+  int step_size;
+  int min_size;
+  int max_size;
+
+  /* state */
+  int next_size;
+};
+
+struct _GstChopMyDataClass
+{
+  GstElementClass base_chopmydata_class;
+};
+
+GType gst_chop_my_data_get_type (void);
+
+G_END_DECLS
+
+#endif