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gst/debug/: add element that quasi-randomly changes bytes in the stream.

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Original commit message from CVS:
* gst/debug/Makefile.am:
* gst/debug/breakmydata.c:
add element that quasi-randomly changes bytes in the stream.
Intended use is robustness checking of demuxers and decoders in
media tests.
This commit is contained in:
Benjamin Otte 2004-03-25 01:03:37 +00:00
parent a1b9442d60
commit af8ae1e043
3 changed files with 285 additions and 2 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2004-03-25 Benjamin Otte <otte@gnome.org>
* gst/debug/Makefile.am:
* gst/debug/breakmydata.c:
add element that quasi-randomly changes bytes in the stream.
Intended use is robustness checking of demuxers and decoders in
media tests.
2004-03-24 Benjamin Otte <otte@gnome.org>
* ext/alsa/gstalsa.c: (gst_alsa_open_audio),

7
gst/debug/Makefile.am
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@ -1,13 +1,16 @@
plugin_LTLIBRARIES = libgstefence.la libgstnavigationtest.la
plugin_LTLIBRARIES = libgstefence.la libgstnavigationtest.la libgstdebug.la
noinst_HEADERS = efence.h gstnavigationtest.h
libgstefence_la_SOURCES = efence.c
libgstefence_la_CFLAGS = $(GST_CFLAGS)
libgstefence_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstnavigationtest_la_SOURCES = gstnavigationtest.c
libgstnavigationtest_la_CFLAGS = $(GST_CFLAGS) -I$(top_srcdir)/gst/videofilter
libgstnavigationtest_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstdebug_la_SOURCES = breakmydata.c
libgstdebug_la_CFLAGS = $(GST_CFLAGS)
libgstdebug_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

272
gst/debug/breakmydata.c Normal file
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@ -0,0 +1,272 @@
/* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst.h>
GST_DEBUG_CATEGORY_STATIC (gst_break_my_data_debug);
#define GST_CAT_DEFAULT gst_break_my_data_debug
/* This plugin modifies the contents of the buffer it is passed randomly
* according to the parameters set.
* It otherwise acts as an identity.
*/
#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(obj) \
(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
{
GstElement element;
GstPad *sinkpad;
GstPad *srcpad;
GRand *rand;
guint skipped;
guint32 seed;
gint set;
guint skip;
gdouble probability;
};
struct _GstBreakMyDataClass
{
GstElementClass parent_class;
};
GST_BOILERPLATE (GstBreakMyData, gst_break_my_data, GstElement,
GST_TYPE_ELEMENT)
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 void gst_break_my_data_chain (GstPad * pad, GstData * _data);
static GstElementStateReturn gst_break_my_data_change_state (GstElement *
element);
static void gst_break_my_data_base_init (gpointer g_class)
{
static GstElementDetails details = GST_ELEMENT_DETAILS ("breakmydata",
"Testing",
"randomly change data in the stream",
"Benjamin Otte <otte@gnome>");
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (gstelement_class, &details);
}
static void
gst_break_my_data_class_init (GstBreakMyDataClass * klass)
{
GObjectClass *object = G_OBJECT_CLASS (klass);
GstElementClass *element = GST_ELEMENT_CLASS (klass);
object->set_property = GST_DEBUG_FUNCPTR (gst_break_my_data_set_property);
object->get_property = GST_DEBUG_FUNCPTR (gst_break_my_data_get_property);
g_object_class_install_property (object, ARG_SEED,
g_param_spec_uint ("seed", "seed",
"seed for randomness (initialized when goint from READY to PAUSED)",
0, 0xFFFFFFFF, 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (object, ARG_SET_TO,
g_param_spec_int ("set-to", "set-to",
"set changed bytes to this value (-1 means random value",
-1, 255, -1, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (object, 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 (object, ARG_PROBABILITY,
g_param_spec_double ("probability", "probability",
"probability that a buffer is changed", 0.0, 1.0, 0.0,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
element->change_state = gst_break_my_data_change_state;
}
static void
gst_break_my_data_init (GstBreakMyData * break_my_data)
{
break_my_data->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
gst_element_add_pad (GST_ELEMENT (break_my_data), break_my_data->sinkpad);
gst_pad_set_chain_function (break_my_data->sinkpad,
GST_DEBUG_FUNCPTR (gst_break_my_data_chain));
gst_pad_set_link_function (break_my_data->sinkpad, gst_pad_proxy_pad_link);
gst_pad_set_getcaps_function (break_my_data->sinkpad, gst_pad_proxy_getcaps);
break_my_data->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (break_my_data), break_my_data->srcpad);
gst_pad_set_link_function (break_my_data->srcpad, gst_pad_proxy_pad_link);
gst_pad_set_getcaps_function (break_my_data->srcpad, gst_pad_proxy_getcaps);
}
static void
gst_break_my_data_chain (GstPad * pad, GstData * data)
{
GstBuffer *copy = NULL, *buf = GST_BUFFER (data);
GstBreakMyData *bmd = GST_BREAK_MY_DATA (gst_pad_get_parent (pad));
guint i, size;
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) < bmd->probability) {
guint8 new;
if (!copy)
copy = gst_buffer_copy_on_write (buf);
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%2X to 0x%2X", i,
(gint) GST_BUFFER_DATA (copy)[i], (gint) new);
GST_BUFFER_DATA (copy)[i] = new;
}
}
/* don't overflow */
bmd->skipped += MIN (G_MAXUINT - bmd->skipped, GST_BUFFER_SIZE (buf));
gst_pad_push (bmd->srcpad, GST_DATA (copy ? copy : buf));
}
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);
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;
}
}
static void
gst_break_my_data_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstBreakMyData *bmd = GST_BREAK_MY_DATA (object);
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;
}
}
static GstElementStateReturn
gst_break_my_data_change_state (GstElement * element)
{
GstBreakMyData *bmd = GST_BREAK_MY_DATA (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_READY_TO_PAUSED:
bmd->rand = g_rand_new_with_seed (bmd->seed);
bmd->skipped = 0;
break;
case GST_STATE_PAUSED_TO_READY:
g_rand_free (bmd->rand);
break;
default:
break;
}
return GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
(element), GST_STATE_SUCCESS);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "breakmydata", GST_RANK_NONE,
GST_TYPE_BREAK_MY_DATA))
return FALSE;
GST_DEBUG_CATEGORY_INIT (gst_break_my_data_debug, "breakmydata", 0,
"debugging category for breakmydata element");
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"debug",
"elements for testing and debugging",
plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)