mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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517 lines
14 KiB
C
517 lines
14 KiB
C
/*
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* GStreamer
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* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) 2002 David A. Schleef <ds@schleef.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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#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 <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include "efence.h"
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#ifndef MAP_ANONYMOUS
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#ifdef MAP_ANON
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#define MAP_ANONYMOUS MAP_ANON
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#else
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/* assume we don't need it */
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#define MAP_ANONYMOUS 0
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#endif
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#endif
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GST_DEBUG_CATEGORY_STATIC (gst_efence_debug);
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#define GST_CAT_DEFAULT gst_efence_debug
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/* Filter signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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ARG_FENCE_TOP
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};
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static GstStaticPadTemplate gst_efence_sink_factory =
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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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static GstStaticPadTemplate gst_efence_src_factory =
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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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static void gst_efence_base_init (gpointer g_class);
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static void gst_efence_class_init (GstEFenceClass * klass);
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static void gst_efence_init (GstEFence * filter);
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static void gst_efence_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_efence_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_efence_chain (GstPad * pad, GstBuffer * buf);
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static GstFlowReturn gst_efence_getrange (GstPad * pad, guint64 offset,
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guint length, GstBuffer ** buffer);
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static gboolean gst_efence_checkgetrange (GstPad * pad);
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static gboolean gst_efence_activate_src_pull (GstPad * pad, gboolean active);
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static GstElementClass *parent_class = NULL;
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typedef struct _GstMetaFenced
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{
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GstMeta meta;
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void *region;
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unsigned int length;
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} GstMetaFenced;
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static const GstMetaInfo *
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gst_meta_fenced_get_info (void)
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{
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static const GstMetaInfo *meta_fenced_info = NULL;
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if (meta_fenced_info == NULL) {
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meta_fenced_info = gst_meta_register ("GstMetaFenced", "GstMetaFenced",
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sizeof (GstMetaFenced),
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(GstMetaInitFunction) NULL,
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(GstMetaFreeFunction) NULL,
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(GstMetaCopyFunction) NULL, (GstMetaTransformFunction) NULL);
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}
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return meta_fenced_info;
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}
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#define GST_META_FENCED_GET(buf) ((GstMetaFenced *)gst_buffer_get_meta(buf,gst_meta_fenced_get_info()))
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#define GST_META_FENCED_ADD(buf) ((GstMetaFenced *)gst_buffer_add_meta(buf,gst_meta_fenced_get_info(),NULL))
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static void gst_fenced_buffer_dispose (GstBuffer * buf);
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static GstBuffer *gst_fenced_buffer_copy (const GstBuffer * buffer);
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static void *gst_fenced_buffer_alloc (GstBuffer * buffer, unsigned int length,
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gboolean fence_top);
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#if 0
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static GstFlowReturn gst_efence_buffer_alloc (GstPad * pad, guint64 offset,
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guint size, GstCaps * caps, GstBuffer ** buf);
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#endif
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GType
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gst_gst_efence_get_type (void)
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{
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static GType plugin_type = 0;
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if (!plugin_type) {
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static const GTypeInfo plugin_info = {
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sizeof (GstEFenceClass),
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gst_efence_base_init,
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NULL,
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(GClassInitFunc) gst_efence_class_init,
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NULL,
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NULL,
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sizeof (GstEFence),
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0,
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(GInstanceInitFunc) gst_efence_init,
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};
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plugin_type = g_type_register_static (GST_TYPE_ELEMENT,
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"GstEFence", &plugin_info, 0);
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}
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return plugin_type;
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}
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static void
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gst_efence_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_efence_sink_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_efence_src_factory));
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gst_element_class_set_details_simple (element_class, "Electric Fence",
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"Testing",
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"This element converts a stream of normal GStreamer buffers into a "
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"stream of buffers that are allocated in such a way that out-of-bounds "
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"access to data in the buffer is more likely to cause segmentation "
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"faults. This allocation method is very similar to the debugging tool "
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"\"Electric Fence\".", "David A. Schleef <ds@schleef.org>");
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}
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/* initialize the plugin's class */
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static void
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gst_efence_class_init (GstEFenceClass * klass)
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{
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GObjectClass *gobject_class;
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gobject_class = (GObjectClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = gst_efence_set_property;
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gobject_class->get_property = gst_efence_get_property;
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g_object_class_install_property (gobject_class, ARG_FENCE_TOP,
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g_param_spec_boolean ("fence-top", "Fence Top",
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"Align buffers with top of fenced region", TRUE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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/* initialize the new element
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* instantiate pads and add them to element
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* set functions
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* initialize structure
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*/
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static void
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gst_efence_init (GstEFence * filter)
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{
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filter->sinkpad =
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gst_pad_new_from_static_template (&gst_efence_sink_factory, "sink");
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gst_pad_set_getcaps_function (filter->sinkpad,
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GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
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gst_pad_set_setcaps_function (filter->sinkpad,
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GST_DEBUG_FUNCPTR (gst_pad_proxy_setcaps));
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gst_pad_set_chain_function (filter->sinkpad,
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GST_DEBUG_FUNCPTR (gst_efence_chain));
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#if 0
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gst_pad_set_bufferalloc_function (filter->sinkpad,
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GST_DEBUG_FUNCPTR (gst_efence_buffer_alloc));
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#endif
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gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
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filter->srcpad =
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gst_pad_new_from_static_template (&gst_efence_src_factory, "src");
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gst_pad_set_getcaps_function (filter->srcpad,
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GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
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gst_pad_set_setcaps_function (filter->srcpad,
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GST_DEBUG_FUNCPTR (gst_pad_proxy_setcaps));
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gst_pad_set_checkgetrange_function (filter->srcpad,
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GST_DEBUG_FUNCPTR (gst_efence_checkgetrange));
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gst_pad_set_getrange_function (filter->srcpad,
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GST_DEBUG_FUNCPTR (gst_efence_getrange));
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gst_pad_set_activatepull_function (filter->srcpad,
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GST_DEBUG_FUNCPTR (gst_efence_activate_src_pull));
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gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
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filter->fence_top = TRUE;
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}
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/* chain function
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* this function does the actual processing
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*/
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static GstFlowReturn
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gst_efence_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstEFence *efence;
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GstBuffer *copy;
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efence = GST_EFENCE (GST_OBJECT_PARENT (pad));
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g_return_val_if_fail (GST_IS_EFENCE (efence), GST_FLOW_ERROR);
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#if 0
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if (GST_IS_FENCED_BUFFER (buffer)) {
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GST_DEBUG_OBJECT (efence, "Passing on existing fenced buffer with caps %"
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GST_PTR_FORMAT, GST_BUFFER_CAPS (buffer));
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return gst_pad_push (efence->srcpad, buffer);
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}
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#endif
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copy = (GstBuffer *) gst_fenced_buffer_copy (buffer);
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GST_DEBUG_OBJECT (efence, "Pushing newly fenced buffer with caps %"
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GST_PTR_FORMAT ", data=%p, size=%u", GST_BUFFER_CAPS (copy),
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GST_BUFFER_DATA (copy), GST_BUFFER_SIZE (copy));
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gst_buffer_unref (buffer);
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return gst_pad_push (efence->srcpad, copy);
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}
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static GstFlowReturn
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gst_efence_getrange (GstPad * pad, guint64 offset,
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guint length, GstBuffer ** buffer)
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{
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GstEFence *efence;
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GstFlowReturn ret;
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GstBuffer *ownbuf;
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GstPad *peer;
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efence = GST_EFENCE (GST_OBJECT_PARENT (pad));
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peer = gst_pad_get_peer (efence->sinkpad);
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if (!peer)
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return GST_FLOW_NOT_LINKED;
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if ((ret = gst_pad_get_range (peer, offset, length, buffer)) != GST_FLOW_OK)
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goto beach;
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ownbuf = (GstBuffer *) gst_fenced_buffer_copy (*buffer);
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gst_buffer_unref ((GstBuffer *) * buffer);
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*buffer = ownbuf;
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beach:
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gst_object_unref (peer);
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return ret;
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}
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static gboolean
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gst_efence_checkgetrange (GstPad * pad)
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{
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GstEFence *efence = GST_EFENCE (GST_OBJECT_PARENT (pad));
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return gst_pad_check_pull_range (efence->sinkpad);
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}
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static gboolean
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gst_efence_activate_src_pull (GstPad * pad, gboolean active)
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{
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GstEFence *efence = GST_EFENCE (GST_OBJECT_PARENT (pad));
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return gst_pad_activate_pull (efence->sinkpad, active);
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}
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#if 0
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static GstFlowReturn
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gst_efence_buffer_alloc (GstPad * pad, guint64 offset,
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guint size, GstCaps * caps, GstBuffer ** buf)
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{
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GstBuffer *buffer;
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GstEFence *efence;
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g_return_val_if_fail (buf != NULL, GST_FLOW_ERROR);
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g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
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efence = GST_EFENCE (GST_OBJECT_PARENT (pad));
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buffer = (GstBuffer *) gst_mini_object_new (GST_TYPE_FENCED_BUFFER);
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GST_BUFFER_DATA (buffer) = gst_fenced_buffer_alloc (buffer, size,
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efence->fence_top);
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GST_BUFFER_SIZE (buffer) = size;
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GST_BUFFER_OFFSET (buffer) = offset;
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if (caps)
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gst_buffer_set_caps (buffer, caps);
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*buf = buffer;
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GST_DEBUG_OBJECT (efence, "Allocated buffer of size %u, caps: %"
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GST_PTR_FORMAT, GST_BUFFER_SIZE (buffer), GST_BUFFER_CAPS (buffer));
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return GST_FLOW_OK;
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}
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#endif
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static void
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gst_efence_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstEFence *filter;
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g_return_if_fail (GST_IS_EFENCE (object));
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filter = GST_EFENCE (object);
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switch (prop_id) {
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case ARG_FENCE_TOP:
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filter->fence_top = g_value_get_boolean (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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}
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static void
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gst_efence_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstEFence *filter;
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g_return_if_fail (GST_IS_EFENCE (object));
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filter = GST_EFENCE (object);
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switch (prop_id) {
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case ARG_FENCE_TOP:
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g_value_set_boolean (value, filter->fence_top);
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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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}
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/* entry point to initialize the plug-in
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* initialize the plug-in itself
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* register the element factories and pad templates
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* register the features
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*/
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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if (!gst_element_register (plugin, "efence", GST_RANK_NONE, GST_TYPE_EFENCE))
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return FALSE;
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GST_DEBUG_CATEGORY_INIT (gst_efence_debug, "efence", 0,
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"Debug output from the efence element");
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/* plugin initialisation succeeded */
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return TRUE;
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"efence",
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"This element converts a stream of normal GStreamer buffers into a "
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"stream of buffers that are allocated in such a way that out-of-bounds "
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"access to data in the buffer is more likely to cause segmentation "
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"faults. This allocation method is very similar to the debugging tool "
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"\"Electric Fence\".",
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plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
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static void
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gst_fenced_buffer_dispose (GstBuffer * buffer)
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{
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GstMetaFenced *meta;
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meta = GST_META_FENCED_GET (buffer);
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GST_DEBUG ("free buffer=%p", buffer);
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/* free our data */
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if (GST_BUFFER_DATA (buffer)) {
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GST_DEBUG ("free region %p %d", meta->region, meta->length);
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munmap (meta->region, meta->length);
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}
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}
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static GstBuffer *
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gst_fenced_buffer_copy (const GstBuffer * buffer)
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{
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GstBuffer *copy;
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void *ptr;
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guint mask;
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g_return_val_if_fail (buffer != NULL, NULL);
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/* create a fresh new buffer */
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copy = gst_buffer_new ();
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/* we simply copy everything from our parent */
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ptr = gst_fenced_buffer_alloc (copy, GST_BUFFER_SIZE (buffer), TRUE);
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memcpy (ptr, GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer));
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/* copy relevant flags */
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mask = GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_IN_CAPS |
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GST_BUFFER_FLAG_DELTA_UNIT;
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GST_MINI_OBJECT (copy)->flags |= GST_MINI_OBJECT (buffer)->flags & mask;
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GST_BUFFER_DATA (copy) = ptr;
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GST_BUFFER_SIZE (copy) = GST_BUFFER_SIZE (buffer);
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GST_BUFFER_TIMESTAMP (copy) = GST_BUFFER_TIMESTAMP (buffer);
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GST_BUFFER_DURATION (copy) = GST_BUFFER_DURATION (buffer);
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GST_BUFFER_OFFSET (copy) = GST_BUFFER_OFFSET (buffer);
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GST_BUFFER_OFFSET_END (copy) = GST_BUFFER_OFFSET_END (buffer);
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if (GST_BUFFER_CAPS (buffer))
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GST_BUFFER_CAPS (copy) = gst_caps_ref (GST_BUFFER_CAPS (buffer));
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else
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GST_BUFFER_CAPS (copy) = NULL;
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GST_DEBUG ("Copied buffer %p with ts %" GST_TIME_FORMAT
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", caps: %" GST_PTR_FORMAT, buffer,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (copy)), GST_BUFFER_CAPS (copy));
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return copy;
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}
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void *
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gst_fenced_buffer_alloc (GstBuffer * buffer, unsigned int length,
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gboolean fence_top)
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{
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int alloc_size;
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void *region;
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GstMetaFenced *meta;
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int page_size;
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GST_DEBUG ("buffer=%p length=%d fence_top=%d", buffer, length, fence_top);
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if (length == 0)
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return NULL;
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#ifdef _SC_PAGESIZE
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page_size = sysconf (_SC_PAGESIZE);
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#else
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page_size = getpagesize ();
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#endif
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/* Allocate a complete page, and one on either side */
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alloc_size = ((length - 1) & ~(page_size - 1)) + page_size;
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alloc_size += 2 * page_size;
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region = mmap (NULL, alloc_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (region == MAP_FAILED) {
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g_warning ("mmap failed");
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return NULL;
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}
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GST_MINI_OBJECT_CAST (buffer)->dispose =
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(GstMiniObjectDisposeFunction) gst_fenced_buffer_dispose;
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GST_MINI_OBJECT_CAST (buffer)->copy =
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(GstMiniObjectCopyFunction) gst_fenced_buffer_copy;
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meta = GST_META_FENCED_ADD (buffer);
|
|
|
|
#if 0
|
|
munmap (region, page_size);
|
|
munmap (region + alloc_size - page_size, page_size);
|
|
|
|
meta->region = region + page_size;
|
|
meta->length = alloc_size - page_size;
|
|
#else
|
|
mprotect (region, page_size, PROT_NONE);
|
|
mprotect ((char *) region + alloc_size - page_size, page_size, PROT_NONE);
|
|
|
|
meta->region = region;
|
|
meta->length = alloc_size;
|
|
#endif
|
|
|
|
GST_DEBUG ("new region %p %d", meta->region, meta->length);
|
|
|
|
if (fence_top) {
|
|
int offset;
|
|
|
|
/* Align to top of region, but force alignment to 4 bytes */
|
|
offset = alloc_size - page_size - length;
|
|
offset &= ~0x3;
|
|
return (void *) ((char *) region + offset);
|
|
} else {
|
|
return (void *) ((char *) region + page_size);
|
|
}
|
|
}
|