gstreamer/gst/debugutils/breakmydata.c
2011-08-22 13:10:07 +02:00

292 lines
8.4 KiB
C

/* 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))
GType gst_break_my_data_get_type (void);
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);
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 gst_break_my_data_parent_class parent_class
G_DEFINE_TYPE (GstBreakMyData, gst_break_my_data, GST_TYPE_BASE_TRANSFORM);
static void
gst_break_my_data_class_init (GstBreakMyDataClass * klass)
{
GstBaseTransformClass *gstbasetrans_class;
GstElementClass *gstelement_class;
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_break_my_data_debug, "breakmydata", 0,
"debugging category for breakmydata element");
gobject_class->set_property = gst_break_my_data_set_property;
gobject_class->get_property = 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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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 | G_PARAM_STATIC_STRINGS));
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_simple (gstelement_class, "Break my data",
"Testing",
"randomly change data in the stream", "Benjamin Otte <otte@gnome>");
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)
{
gst_base_transform_set_in_place (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);
guint8 *data;
gsize 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;
}
data = gst_buffer_map (buf, &size, NULL, GST_MAP_READWRITE);
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 (data + i), (guint) ((guint8) new));
data[i] = new;
}
}
/* don't overflow */
bmd->skipped += MIN (G_MAXUINT - bmd->skipped, size);
gst_buffer_unmap (buf, data, size);
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;
}