gstreamer/gst/autoplug/gstspideridentity.c
Benjamin Otte e9d5cf15ba fix segfault when pushing events twice
Original commit message from CVS:
fix segfault when pushing events twice
2002-01-30 21:54:06 +00:00

503 lines
16 KiB
C

/* GStreamer
* Copyright (C) 2002 Erik Walthinsen <omega@cse.ogi.edu>
* 2002 Wim Taymans <wtay@chello.be>
*
* gstspideridentity.c: IDentity element for the spider autoplugger
*
* 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.
*/
#include "gstspideridentity.h"
#include "gstspider.h"
GstElementDetails gst_spider_identity_details = {
"SpiderIdentity",
"Filter/Autoplug",
"connection between spider and outside elements",
VERSION,
"Benjamin Otte <in7y118@public.uni-hamburg.de>",
"(C) 2002",
};
/* generic templates
* delete me when meging with spider.c
*/
GST_PADTEMPLATE_FACTORY (spider_src_factory,
"src_%02d",
GST_PAD_SRC,
GST_PAD_REQUEST,
NULL /* no caps */
);
GST_PADTEMPLATE_FACTORY (spider_sink_factory,
"sink_%02d",
GST_PAD_SINK,
GST_PAD_REQUEST,
NULL /* no caps */
);
/* SpiderIdentity signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
/* GObject stuff */
static void gst_spider_identity_class_init (GstSpiderIdentityClass *klass);
static void gst_spider_identity_init (GstSpiderIdentity *spider_identity);
/* functions set in pads, elements and stuff */
static void gst_spider_identity_chain (GstPad *pad, GstBuffer *buf);
static GstElementStateReturn gst_spider_identity_change_state (GstElement *element);
static GstPadConnectReturn gst_spider_identity_connect (GstPad *pad, GstCaps *caps);
static GstCaps* gst_spider_identity_getcaps (GstPad *pad, GstCaps *caps);
/* loop functions */
static void gst_spider_identity_dumb_loop (GstSpiderIdentity *ident);
static void gst_spider_identity_src_loop (GstSpiderIdentity *ident);
static void gst_spider_identity_sink_loop_typefinding (GstSpiderIdentity *ident);
static void gst_spider_identity_sink_loop_emptycache (GstSpiderIdentity *ident);
/* set/get functions */
gboolean gst_spider_identity_is_plugged (GstSpiderIdentity *identity);
void gst_spider_identity_set_caps (GstSpiderIdentity *identity, GstCaps *caps);
/* callback */
static void callback_typefind_have_type (GstElement *typefind, GstCaps *caps, GstSpiderIdentity *identity);
/* other functions */
static void gst_spider_identity_start_typefinding (GstSpiderIdentity *ident);
static GstElementClass *parent_class = NULL;
/* no signals
static guint gst_spider_identity_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_spider_identity_get_type (void)
{
static GType spider_identity_type = 0;
if (!spider_identity_type) {
static const GTypeInfo spider_identity_info = {
sizeof(GstSpiderIdentityClass), NULL,
NULL,
(GClassInitFunc)gst_spider_identity_class_init,
NULL,
NULL,
sizeof(GstSpiderIdentity),
0,
(GInstanceInitFunc)gst_spider_identity_init,
};
spider_identity_type = g_type_register_static (GST_TYPE_ELEMENT, "GstSpiderIdentity", &spider_identity_info, 0);
}
return spider_identity_type;
}
static void
gst_spider_identity_class_init (GstSpiderIdentityClass *klass)
{
GstElementClass *gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
/* add our two pad templates */
gst_element_class_add_padtemplate (gstelement_class, GST_PADTEMPLATE_GET (spider_src_factory));
gst_element_class_add_padtemplate (gstelement_class, GST_PADTEMPLATE_GET (spider_sink_factory));
gstelement_class->change_state = GST_DEBUG_FUNCPTR(gst_spider_identity_change_state);
gstelement_class->request_new_pad = GST_DEBUG_FUNCPTR(gst_spider_identity_request_new_pad);
}
static GstBufferPool*
gst_spider_identity_get_bufferpool (GstPad *pad)
{
/* fix me */
GstSpiderIdentity *spider_identity;
spider_identity = GST_SPIDER_IDENTITY (gst_pad_get_parent (pad));
return gst_pad_get_bufferpool (spider_identity->src);
}
static void
gst_spider_identity_init (GstSpiderIdentity *spider_identity)
{
/* pads */
spider_identity->sink = NULL;
spider_identity->src = NULL;
/* variables */
spider_identity->plugged = FALSE;
/* caching */
spider_identity->cache_start = NULL;
spider_identity->cache_end = NULL;
}
static void
gst_spider_identity_chain (GstPad *pad, GstBuffer *buf)
{
GstSpiderIdentity *ident;
/* g_print ("chaining on pad %s:%s with buffer %p\n", GST_DEBUG_PAD_NAME (pad), buf); */
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
if (buf == NULL) return;
ident = GST_SPIDER_IDENTITY (gst_pad_get_parent (pad));
if (GST_IS_EVENT (buf)) {
gst_pad_event_default (ident->sink, GST_EVENT (buf));
return;
}
if ((ident->src != NULL) && (GST_PAD_PEER (ident->src) != NULL)) {
/* g_print("pushing buffer %p (refcount %d - buffersize %d) to pad %s:%s\n", buf, GST_BUFFER_REFCOUNT (buf), GST_BUFFER_SIZE (buf), GST_DEBUG_PAD_NAME (ident->src)); */
gst_pad_push (ident->src, buf);
} else if (GST_IS_BUFFER (buf)) {
gst_buffer_unref (buf);
}
}
GstSpiderIdentity*
gst_spider_identity_new_src (gchar *name)
{
GstSpiderIdentity *ret = (GstSpiderIdentity *) g_object_new (gst_spider_identity_get_type (), NULL);
GST_ELEMENT_NAME (ret) = name;
/* set the right functions */
gst_element_set_loop_function (GST_ELEMENT (ret), (GstElementLoopFunction) GST_DEBUG_FUNCPTR (gst_spider_identity_src_loop));
return ret;
}
GstSpiderIdentity*
gst_spider_identity_new_sink (gchar *name)
{
GstSpiderIdentity *ret = (GstSpiderIdentity *) g_object_new (gst_spider_identity_get_type (), NULL);
GST_ELEMENT_NAME (ret) = name;
return ret;
}
/* shamelessly stolen from gstqueue.c to get proxy connections */
static GstPadConnectReturn
gst_spider_identity_connect (GstPad *pad, GstCaps *caps)
{
GstSpiderIdentity *spider_identity = GST_SPIDER_IDENTITY (gst_pad_get_parent (pad));
GstPad *otherpad;
if (pad == spider_identity->src)
otherpad = spider_identity->sink;
else
otherpad = spider_identity->src;
if (otherpad != NULL)
return gst_pad_proxy_connect (otherpad, caps);
return GST_PAD_CONNECT_OK;
}
static GstCaps*
gst_spider_identity_getcaps (GstPad *pad, GstCaps *caps)
{
GstSpiderIdentity *spider_identity = GST_SPIDER_IDENTITY (gst_pad_get_parent (pad));
GstPad *otherpad;
if (pad == spider_identity->src)
otherpad = spider_identity->sink;
else
otherpad = spider_identity->src;
if (otherpad != NULL)
return gst_pad_get_allowed_caps (otherpad);
return NULL;
}
GstPad*
gst_spider_identity_request_new_pad (GstElement *element, GstPadTemplate *templ, const gchar *name)
{
GstSpiderIdentity *ident;
/*checks */
g_return_val_if_fail (templ != NULL, NULL);
g_return_val_if_fail (GST_IS_PADTEMPLATE (templ), NULL);
ident = GST_SPIDER_IDENTITY (element);
g_return_val_if_fail (ident != NULL, NULL);
g_return_val_if_fail (GST_IS_SPIDER_IDENTITY (ident), NULL);
switch (GST_PADTEMPLATE_DIRECTION (templ))
{
case GST_PAD_SINK:
if (ident->sink != NULL) break;
/* sink */
GST_DEBUG(0, "element %s requests new sink pad\n", GST_ELEMENT_NAME(ident));
ident->sink = gst_pad_new ("sink", GST_PAD_SINK);
gst_element_add_pad (GST_ELEMENT (ident), ident->sink);
gst_pad_set_connect_function (ident->sink, GST_DEBUG_FUNCPTR (gst_spider_identity_connect));
gst_pad_set_getcaps_function (ident->sink, GST_DEBUG_FUNCPTR (gst_spider_identity_getcaps));
return ident->sink;
case GST_PAD_SRC:
/* src */
if (ident->src != NULL) break;
GST_DEBUG(0, "element %s requests new src pad\n", GST_ELEMENT_NAME(ident));
ident->src = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (ident), ident->src);
gst_pad_set_connect_function (ident->src, GST_DEBUG_FUNCPTR (gst_spider_identity_connect));
gst_pad_set_getcaps_function (ident->src, GST_DEBUG_FUNCPTR (gst_spider_identity_getcaps));
return ident->src;
default:
break;
}
GST_DEBUG(0, "element %s requested a new pad but none could be created\n", GST_ELEMENT_NAME(ident));
return NULL;
}
/* this function has to
* - start the autoplugger
* - start type finding
* ...
*/
static GstElementStateReturn
gst_spider_identity_change_state (GstElement *element)
{
GstSpiderIdentity *ident;
GstSpider *spider;
GstElementStateReturn ret = GST_STATE_SUCCESS;
/* element check */
ident = GST_SPIDER_IDENTITY (element);
g_return_val_if_fail (ident != NULL, GST_PAD_CONNECT_REFUSED);
g_return_val_if_fail (GST_IS_SPIDER_IDENTITY (ident), GST_PAD_CONNECT_REFUSED);
/* autoplugger check */
spider = GST_SPIDER (GST_ELEMENT_PARENT (ident));
g_return_val_if_fail (spider != NULL, GST_PAD_CONNECT_REFUSED);
g_return_val_if_fail (GST_IS_SPIDER (spider), GST_PAD_CONNECT_REFUSED);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_PLAYING:
/* start typefinding or plugging */
if ((ident->sink != NULL) && (ident->src == NULL))
{
if (gst_pad_get_caps ((GstPad *) GST_PAD_PEER (ident->sink)) == NULL)
{
gst_spider_identity_start_typefinding (ident);
break;
} else {
gst_spider_plug (ident);
}
}
/* autoplug on src */
if ((ident->src != NULL) && (ident->sink == NULL))
{
gst_spider_plug (ident);
}
default:
break;
}
if ((ret != GST_STATE_FAILURE) && (GST_ELEMENT_CLASS (parent_class)->change_state))
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
return ret;
}
static void
gst_spider_identity_start_typefinding (GstSpiderIdentity *ident)
{
GstElement* typefind;
GST_DEBUG (GST_CAT_AUTOPLUG, "element %s starts typefinding", GST_ELEMENT_NAME(ident));
/* create and connect typefind object */
typefind = gst_elementfactory_make ("typefind", g_strdup_printf("%s%s", "typefind", GST_ELEMENT_NAME(ident)));
g_signal_connect (G_OBJECT (typefind), "have_type",
G_CALLBACK (callback_typefind_have_type), ident);
gst_bin_add (GST_BIN (GST_ELEMENT_PARENT (ident)), typefind);
gst_pad_connect (gst_element_get_compatible_pad ((GstElement *) ident, gst_element_get_pad (typefind, "sink")), gst_element_get_pad (typefind, "sink"));
gst_element_set_loop_function (GST_ELEMENT (ident), (GstElementLoopFunction) GST_DEBUG_FUNCPTR (gst_spider_identity_sink_loop_typefinding));
}
/* waiting for a good suggestion on where to set the caps from typefinding
* Caps must be cleared when pad is disconnected
*
* Currently we are naive and set the caps on the source of the identity object
* directly and hope to avoid any disturbance in the force.
*/
void
gst_spider_identity_set_caps (GstSpiderIdentity *ident, GstCaps *caps)
{
if (ident->src)
{
gst_pad_try_set_caps (ident->src, caps);
}
}
static void
callback_typefind_have_type (GstElement *typefind, GstCaps *caps, GstSpiderIdentity *ident)
{
gboolean restart_spider = FALSE;
GST_INFO (GST_CAT_AUTOPLUG, "element %s has found caps", GST_ELEMENT_NAME(ident));
/* checks */
/* we have to ref the typefind, because if me remove it the scheduler segfaults
* FIXME: get rid of the typefinder
*/
gst_object_ref (GST_OBJECT (typefind));
g_assert (GST_IS_ELEMENT (typefind));
g_assert (GST_IS_SPIDER_IDENTITY (ident));
/* pause the autoplugger */
if (gst_element_get_state (GST_ELEMENT (GST_ELEMENT_PARENT(ident))) == GST_STATE_PLAYING)
{
gst_element_set_state (GST_ELEMENT (GST_ELEMENT_PARENT(ident)), GST_STATE_PAUSED);
restart_spider = TRUE;
}
/* remove typefind */
gst_pad_disconnect (ident->src, (GstPad*) GST_RPAD_PEER (ident->src));
gst_bin_remove (GST_BIN (GST_ELEMENT_PARENT (ident)), typefind);
/* set caps */
gst_spider_identity_set_caps (ident, caps);
/* set new loop function, we gotta empty the cache */
gst_element_set_loop_function (GST_ELEMENT (ident), (GstElementLoopFunction) GST_DEBUG_FUNCPTR (gst_spider_identity_sink_loop_emptycache));
/* autoplug this pad */
gst_spider_plug (ident);
/* restart autoplugger */
if (restart_spider)
gst_element_set_state (GST_ELEMENT (GST_ELEMENT_PARENT(ident)), GST_STATE_PLAYING);
}
/* since we can't set the loop function to NULL if there's a cothread for us,
* we have to use a dumb one
*/
static void
gst_spider_identity_dumb_loop (GstSpiderIdentity *ident)
{
GstBuffer *buf;
g_return_if_fail (ident != NULL);
g_return_if_fail (GST_IS_SPIDER_IDENTITY (ident));
g_assert (ident->sink != NULL);
buf = gst_pad_pull (ident->sink);
gst_spider_identity_chain (ident->sink, buf);
}
/* do nothing until we're connected - then disable yourself
*/
static void
gst_spider_identity_src_loop (GstSpiderIdentity *ident)
{
/* checks - disable for speed */
g_return_if_fail (ident != NULL);
g_return_if_fail (GST_IS_SPIDER_IDENTITY (ident));
/* we don't want a loop function if we're plugged */
if (ident->sink && GST_PAD_PEER (ident->sink))
{
gst_element_set_loop_function (GST_ELEMENT (ident), (GstElementLoopFunction) GST_DEBUG_FUNCPTR (gst_spider_identity_dumb_loop));
gst_spider_identity_dumb_loop (ident);
return;
}
/* in any case, we don't want to do anything:
* - if we're not plugged, we don't have buffers
* - if we're plugged, we wanna be chained please
*/
gst_element_interrupt (GST_ELEMENT (ident));
return;
}
/* This loop function is only needed when typefinding.
* It works quite simple: get a new buffer, append it to the cache
* and push it to the typefinder.
*/
static void
gst_spider_identity_sink_loop_typefinding (GstSpiderIdentity *ident)
{
GstBuffer *buf;
/* checks - disable for speed */
g_return_if_fail (ident != NULL);
g_return_if_fail (GST_IS_SPIDER_IDENTITY (ident));
g_assert (ident->sink != NULL);
/* get buffer */
buf = gst_pad_pull (ident->sink);
/* if it's an event... */
if (GST_IS_EVENT (buf)) {
/* handle DISCONT events, please */
gst_pad_event_default (ident->sink, GST_EVENT (buf));
}
/* add it to the end of the cache */
gst_buffer_ref (buf);
GST_DEBUG (0, "element %s adds buffer %p (size %d) to cache\n", GST_ELEMENT_NAME(ident), buf, GST_BUFFER_SIZE (buf));
ident->cache_end = g_list_prepend (ident->cache_end, buf);
if (ident->cache_start == NULL)
ident->cache_start = ident->cache_end;
/* push the buffer */
gst_spider_identity_chain (ident->sink, buf);
}
/* this function is needed after typefinding:
* empty the cache and when the cache is empty - remove this function
*/
static void
gst_spider_identity_sink_loop_emptycache (GstSpiderIdentity *ident)
{
GstBuffer *buf;
/* get the buffer and push it */
buf = GST_BUFFER (ident->cache_start->data);
gst_spider_identity_chain (ident->sink, buf);
ident->cache_start = g_list_previous (ident->cache_start);
/* now check if we have more buffers to push */
if (ident->cache_start == NULL)
{
GST_DEBUG(0, "cache from %s is empty, changing loop function\n", GST_ELEMENT_NAME(ident));
/* free cache */
g_list_free (ident->cache_end);
ident->cache_end = NULL;
/* remove loop function */
gst_element_set_loop_function (GST_ELEMENT (ident), (GstElementLoopFunction) GST_DEBUG_FUNCPTR (gst_spider_identity_dumb_loop));
gst_element_interrupt (GST_ELEMENT (ident));
}
}