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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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298 lines
8.5 KiB
C
298 lines
8.5 KiB
C
/* GStreamer
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* Copyright (C) 2004 Benjamin Otte <otte@gnome.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-breakmydata
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*
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* This element modifies the contents of the buffer it is passed randomly
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* according to the parameters set.
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* It otherwise acts as an identity.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/base/gstbasetransform.h>
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GST_DEBUG_CATEGORY_STATIC (gst_break_my_data_debug);
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#define GST_CAT_DEFAULT gst_break_my_data_debug
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#define GST_TYPE_BREAK_MY_DATA \
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(gst_break_my_data_get_type())
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#define GST_BREAK_MY_DATA(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BREAK_MY_DATA,GstBreakMyData))
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#define GST_BREAK_MY_DATA_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BREAK_MY_DATA,GstBreakMyDataClass))
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#define GST_IS_BREAK_MY_DATA(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BREAK_MY_DATA))
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#define GST_IS_BREAK_MY_DATA_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BREAK_MY_DATA))
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enum
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{
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ARG_0,
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ARG_SEED,
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ARG_SET_TO,
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ARG_SKIP,
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ARG_PROBABILITY
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};
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typedef struct _GstBreakMyData GstBreakMyData;
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typedef struct _GstBreakMyDataClass GstBreakMyDataClass;
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struct _GstBreakMyData
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{
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GstBaseTransform basetransform;
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GRand *rand;
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guint skipped;
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guint32 seed;
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gint set;
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guint skip;
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gdouble probability;
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};
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struct _GstBreakMyDataClass
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{
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GstBaseTransformClass parent_class;
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};
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static void gst_break_my_data_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_break_my_data_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_break_my_data_transform_ip (GstBaseTransform * trans,
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GstBuffer * buf);
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static gboolean gst_break_my_data_stop (GstBaseTransform * trans);
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static gboolean gst_break_my_data_start (GstBaseTransform * trans);
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static const GstElementDetails details = GST_ELEMENT_DETAILS ("Break my data",
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"Testing",
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"randomly change data in the stream",
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"Benjamin Otte <otte@gnome>");
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GstStaticPadTemplate bmd_src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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GstStaticPadTemplate bmd_sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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#define DEBUG_INIT(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_break_my_data_debug, "breakmydata", 0, \
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"debugging category for breakmydata element");
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GType gst_break_my_data_get_type (void);
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GST_BOILERPLATE_FULL (GstBreakMyData, gst_break_my_data, GstBaseTransform,
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GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
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static void
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gst_break_my_data_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&bmd_sink_template));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&bmd_src_template));
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gst_element_class_set_details (gstelement_class, &details);
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}
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static void
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gst_break_my_data_class_init (GstBreakMyDataClass * klass)
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{
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GstBaseTransformClass *gstbasetrans_class;
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GObjectClass *gobject_class;
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gobject_class = G_OBJECT_CLASS (klass);
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gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
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gobject_class->set_property =
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GST_DEBUG_FUNCPTR (gst_break_my_data_set_property);
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gobject_class->get_property =
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GST_DEBUG_FUNCPTR (gst_break_my_data_get_property);
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g_object_class_install_property (gobject_class, ARG_SEED,
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g_param_spec_uint ("seed", "seed",
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"seed for randomness (initialized when going from READY to PAUSED)",
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0, G_MAXUINT32, 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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g_object_class_install_property (gobject_class, ARG_SET_TO,
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g_param_spec_int ("set-to", "set-to",
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"set changed bytes to this value (-1 means random value",
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-1, G_MAXUINT8, -1, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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g_object_class_install_property (gobject_class, ARG_SKIP,
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g_param_spec_uint ("skip", "skip",
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"amount of bytes skipped at the beginning of stream",
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0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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g_object_class_install_property (gobject_class, ARG_PROBABILITY,
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g_param_spec_double ("probability", "probability",
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"probability for each byte in the buffer to be changed", 0.0, 1.0,
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0.0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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gstbasetrans_class->transform_ip =
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GST_DEBUG_FUNCPTR (gst_break_my_data_transform_ip);
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gstbasetrans_class->start = GST_DEBUG_FUNCPTR (gst_break_my_data_start);
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gstbasetrans_class->stop = GST_DEBUG_FUNCPTR (gst_break_my_data_stop);
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}
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static void
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gst_break_my_data_init (GstBreakMyData * bmd, GstBreakMyDataClass * g_class)
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{
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gst_base_transform_set_in_place (GST_BASE_TRANSFORM (bmd), TRUE);
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gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (bmd), TRUE);
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}
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static void
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gst_break_my_data_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstBreakMyData *bmd = GST_BREAK_MY_DATA (object);
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GST_OBJECT_LOCK (bmd);
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switch (prop_id) {
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case ARG_SEED:
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bmd->seed = g_value_get_uint (value);
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break;
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case ARG_SET_TO:
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bmd->set = g_value_get_int (value);
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break;
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case ARG_SKIP:
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bmd->skip = g_value_get_uint (value);
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break;
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case ARG_PROBABILITY:
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bmd->probability = g_value_get_double (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (bmd);
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}
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static void
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gst_break_my_data_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstBreakMyData *bmd = GST_BREAK_MY_DATA (object);
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GST_OBJECT_LOCK (bmd);
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switch (prop_id) {
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case ARG_SEED:
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g_value_set_uint (value, bmd->seed);
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break;
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case ARG_SET_TO:
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g_value_set_int (value, bmd->set);
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break;
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case ARG_SKIP:
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g_value_set_uint (value, bmd->skip);
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break;
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case ARG_PROBABILITY:
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g_value_set_double (value, bmd->probability);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (bmd);
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}
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static GstFlowReturn
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gst_break_my_data_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
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{
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GstBreakMyData *bmd = GST_BREAK_MY_DATA (trans);
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guint i, size;
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g_return_val_if_fail (gst_buffer_is_writable (buf), GST_FLOW_ERROR);
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GST_OBJECT_LOCK (bmd);
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if (bmd->skipped < bmd->skip) {
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i = bmd->skip - bmd->skipped;
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} else {
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i = 0;
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}
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size = GST_BUFFER_SIZE (buf);
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GST_LOG_OBJECT (bmd,
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"got buffer %p (size %u, timestamp %" G_GUINT64_FORMAT ", offset %"
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G_GUINT64_FORMAT "", buf, size, GST_BUFFER_TIMESTAMP (buf),
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GST_BUFFER_OFFSET (buf));
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for (; i < size; i++) {
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if (g_rand_double_range (bmd->rand, 0, 1.0) <= bmd->probability) {
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guint8 new;
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if (bmd->set < 0) {
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new = g_rand_int_range (bmd->rand, 0, 256);
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} else {
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new = bmd->set;
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}
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GST_INFO_OBJECT (bmd, "changing byte %u from 0x%02X to 0x%02X", i,
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(guint) GST_READ_UINT8 (GST_BUFFER_DATA (buf) + i),
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(guint) ((guint8) new));
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GST_BUFFER_DATA (buf)[i] = new;
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}
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}
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/* don't overflow */
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bmd->skipped += MIN (G_MAXUINT - bmd->skipped, GST_BUFFER_SIZE (buf));
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GST_OBJECT_UNLOCK (bmd);
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return GST_FLOW_OK;
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}
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static gboolean
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gst_break_my_data_start (GstBaseTransform * trans)
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{
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GstBreakMyData *bmd = GST_BREAK_MY_DATA (trans);
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GST_OBJECT_LOCK (bmd);
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bmd->rand = g_rand_new_with_seed (bmd->seed);
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bmd->skipped = 0;
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GST_OBJECT_UNLOCK (bmd);
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return TRUE;
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}
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static gboolean
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gst_break_my_data_stop (GstBaseTransform * trans)
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{
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GstBreakMyData *bmd = GST_BREAK_MY_DATA (trans);
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GST_OBJECT_LOCK (bmd);
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g_rand_free (bmd->rand);
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bmd->rand = NULL;
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GST_OBJECT_UNLOCK (bmd);
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return TRUE;
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}
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