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-rw-r--r--gst/debugutils/breakmydata.c297
1 files changed, 297 insertions, 0 deletions
diff --git a/gst/debugutils/breakmydata.c b/gst/debugutils/breakmydata.c
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+++ b/gst/debugutils/breakmydata.c
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+/* GStreamer
+ * Copyright (C) 2004 Benjamin Otte <otte@gnome.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-breakmydata
+ *
+ * This element modifies the contents of the buffer it is passed randomly
+ * according to the parameters set.
+ * It otherwise acts as an identity.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <gst/base/gstbasetransform.h>
+
+GST_DEBUG_CATEGORY_STATIC (gst_break_my_data_debug);
+#define GST_CAT_DEFAULT gst_break_my_data_debug
+
+#define GST_TYPE_BREAK_MY_DATA \
+ (gst_break_my_data_get_type())
+#define GST_BREAK_MY_DATA(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BREAK_MY_DATA,GstBreakMyData))
+#define GST_BREAK_MY_DATA_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BREAK_MY_DATA,GstBreakMyDataClass))
+#define GST_IS_BREAK_MY_DATA(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BREAK_MY_DATA))
+#define GST_IS_BREAK_MY_DATA_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BREAK_MY_DATA))
+
+enum
+{
+ ARG_0,
+ ARG_SEED,
+ ARG_SET_TO,
+ ARG_SKIP,
+ ARG_PROBABILITY
+};
+
+typedef struct _GstBreakMyData GstBreakMyData;
+typedef struct _GstBreakMyDataClass GstBreakMyDataClass;
+
+struct _GstBreakMyData
+{
+ GstBaseTransform basetransform;
+
+ GRand *rand;
+ guint skipped;
+
+ guint32 seed;
+ gint set;
+ guint skip;
+ gdouble probability;
+};
+
+struct _GstBreakMyDataClass
+{
+ GstBaseTransformClass parent_class;
+};
+
+static void gst_break_my_data_set_property (GObject * object,
+ guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_break_my_data_get_property (GObject * object,
+ guint prop_id, GValue * value, GParamSpec * pspec);
+
+static GstFlowReturn gst_break_my_data_transform_ip (GstBaseTransform * trans,
+ GstBuffer * buf);
+static gboolean gst_break_my_data_stop (GstBaseTransform * trans);
+static gboolean gst_break_my_data_start (GstBaseTransform * trans);
+
+static const GstElementDetails details = GST_ELEMENT_DETAILS ("Break my data",
+ "Testing",
+ "randomly change data in the stream",
+ "Benjamin Otte <otte@gnome>");
+
+GstStaticPadTemplate bmd_src_template = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS_ANY);
+
+GstStaticPadTemplate bmd_sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS_ANY);
+
+
+#define DEBUG_INIT(bla) \
+ GST_DEBUG_CATEGORY_INIT (gst_break_my_data_debug, "breakmydata", 0, \
+ "debugging category for breakmydata element");
+
+GST_BOILERPLATE_FULL (GstBreakMyData, gst_break_my_data, GstBaseTransform,
+ GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
+
+
+static void
+gst_break_my_data_base_init (gpointer g_class)
+{
+ GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_add_pad_template (gstelement_class,
+ gst_static_pad_template_get (&bmd_sink_template));
+ gst_element_class_add_pad_template (gstelement_class,
+ gst_static_pad_template_get (&bmd_src_template));
+
+ gst_element_class_set_details (gstelement_class, &details);
+}
+
+static void
+gst_break_my_data_class_init (GstBreakMyDataClass * klass)
+{
+ GstBaseTransformClass *gstbasetrans_class;
+ GObjectClass *gobject_class;
+
+ gobject_class = G_OBJECT_CLASS (klass);
+ gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
+
+ gobject_class->set_property =
+ GST_DEBUG_FUNCPTR (gst_break_my_data_set_property);
+ gobject_class->get_property =
+ GST_DEBUG_FUNCPTR (gst_break_my_data_get_property);
+
+ g_object_class_install_property (gobject_class, ARG_SEED,
+ g_param_spec_uint ("seed", "seed",
+ "seed for randomness (initialized when going from READY to PAUSED)",
+ 0, G_MAXUINT32, 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
+ g_object_class_install_property (gobject_class, ARG_SET_TO,
+ g_param_spec_int ("set-to", "set-to",
+ "set changed bytes to this value (-1 means random value",
+ -1, G_MAXUINT8, -1, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
+ g_object_class_install_property (gobject_class, ARG_SKIP,
+ g_param_spec_uint ("skip", "skip",
+ "amount of bytes skipped at the beginning of stream",
+ 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
+ g_object_class_install_property (gobject_class, ARG_PROBABILITY,
+ g_param_spec_double ("probability", "probability",
+ "probability for each byte in the buffer to be changed", 0.0, 1.0,
+ 0.0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
+
+ gstbasetrans_class->transform_ip =
+ GST_DEBUG_FUNCPTR (gst_break_my_data_transform_ip);
+ gstbasetrans_class->start = GST_DEBUG_FUNCPTR (gst_break_my_data_start);
+ gstbasetrans_class->stop = GST_DEBUG_FUNCPTR (gst_break_my_data_stop);
+}
+
+static void
+gst_break_my_data_init (GstBreakMyData * bmd, GstBreakMyDataClass * g_class)
+{
+ gst_base_transform_set_in_place (GST_BASE_TRANSFORM (bmd), TRUE);
+ gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (bmd), TRUE);
+}
+
+static void
+gst_break_my_data_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstBreakMyData *bmd = GST_BREAK_MY_DATA (object);
+
+ GST_OBJECT_LOCK (bmd);
+
+ switch (prop_id) {
+ case ARG_SEED:
+ bmd->seed = g_value_get_uint (value);
+ break;
+ case ARG_SET_TO:
+ bmd->set = g_value_get_int (value);
+ break;
+ case ARG_SKIP:
+ bmd->skip = g_value_get_uint (value);
+ break;
+ case ARG_PROBABILITY:
+ bmd->probability = g_value_get_double (value);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+
+ GST_OBJECT_UNLOCK (bmd);
+}
+
+static void
+gst_break_my_data_get_property (GObject * object, guint prop_id, GValue * value,
+ GParamSpec * pspec)
+{
+ GstBreakMyData *bmd = GST_BREAK_MY_DATA (object);
+
+ GST_OBJECT_LOCK (bmd);
+
+ switch (prop_id) {
+ case ARG_SEED:
+ g_value_set_uint (value, bmd->seed);
+ break;
+ case ARG_SET_TO:
+ g_value_set_int (value, bmd->set);
+ break;
+ case ARG_SKIP:
+ g_value_set_uint (value, bmd->skip);
+ break;
+ case ARG_PROBABILITY:
+ g_value_set_double (value, bmd->probability);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+
+ GST_OBJECT_UNLOCK (bmd);
+}
+
+static GstFlowReturn
+gst_break_my_data_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
+{
+ GstBreakMyData *bmd = GST_BREAK_MY_DATA (trans);
+ guint i, size;
+
+ g_return_val_if_fail (gst_buffer_is_writable (buf), GST_FLOW_ERROR);
+
+ GST_OBJECT_LOCK (bmd);
+
+ if (bmd->skipped < bmd->skip) {
+ i = bmd->skip - bmd->skipped;
+ } else {
+ i = 0;
+ }
+
+ size = GST_BUFFER_SIZE (buf);
+
+ GST_LOG_OBJECT (bmd,
+ "got buffer %p (size %u, timestamp %" G_GUINT64_FORMAT ", offset %"
+ G_GUINT64_FORMAT "", buf, size, GST_BUFFER_TIMESTAMP (buf),
+ GST_BUFFER_OFFSET (buf));
+
+ for (; i < size; i++) {
+ if (g_rand_double_range (bmd->rand, 0, 1.0) <= bmd->probability) {
+ guint8 new;
+
+ if (bmd->set < 0) {
+ new = g_rand_int_range (bmd->rand, 0, 256);
+ } else {
+ new = bmd->set;
+ }
+ GST_INFO_OBJECT (bmd, "changing byte %u from 0x%02X to 0x%02X", i,
+ (guint) GST_READ_UINT8 (GST_BUFFER_DATA (buf) + i),
+ (guint) ((guint8) new));
+ GST_BUFFER_DATA (buf)[i] = new;
+ }
+ }
+ /* don't overflow */
+ bmd->skipped += MIN (G_MAXUINT - bmd->skipped, GST_BUFFER_SIZE (buf));
+
+ GST_OBJECT_UNLOCK (bmd);
+
+ return GST_FLOW_OK;
+}
+
+static gboolean
+gst_break_my_data_start (GstBaseTransform * trans)
+{
+ GstBreakMyData *bmd = GST_BREAK_MY_DATA (trans);
+
+ GST_OBJECT_LOCK (bmd);
+ bmd->rand = g_rand_new_with_seed (bmd->seed);
+ bmd->skipped = 0;
+ GST_OBJECT_UNLOCK (bmd);
+
+ return TRUE;
+}
+
+static gboolean
+gst_break_my_data_stop (GstBaseTransform * trans)
+{
+ GstBreakMyData *bmd = GST_BREAK_MY_DATA (trans);
+
+ GST_OBJECT_LOCK (bmd);
+ g_rand_free (bmd->rand);
+ bmd->rand = NULL;
+ GST_OBJECT_UNLOCK (bmd);
+
+ return TRUE;
+}
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