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gstreamer/gst/gstscheduler.c
David I. Lehn 18adcf5a3f - Fix cothread pointers and allocation so full 2M stack space available: 
Original commit message from CVS:
- Fix cothread pointers and allocation so full 2M stack space available:
- Double maximums to use full stack space:
- COTHREAD_STACKSIZE = 16k
- COTHREAD_MAXTHREADS = 128
- cothread changes only verified on x86
- cothread_create returns NULL if nthreads == MAXTHREADS though not yet handled by gstschedule caller
2001-05-16 07:16:47 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstscheduler.c: Default scheduling code for most cases
*
* 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.
*/
//#define GST_DEBUG_ENABLED
#include "gst_private.h"
#include "gstscheduler.h"
static int
gst_bin_loopfunc_wrapper (int argc,char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GST_DEBUG_ENTER("(%d,'%s')",argc,name);
do {
GST_DEBUG (0,"calling loopfunc %s for element %s\n",
GST_DEBUG_FUNCPTR_NAME (element->loopfunc),name);
(element->loopfunc) (element);
GST_DEBUG (0,"element %s ended loop function\n", name);
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));
GST_FLAG_UNSET(element,GST_ELEMENT_COTHREAD_STOPPING);
GST_DEBUG_LEAVE("(%d,'%s')",argc,name);
return 0;
}
static int
gst_bin_chain_wrapper (int argc,char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GList *pads;
GstPad *pad;
GstRealPad *realpad;
GstBuffer *buf;
GST_DEBUG_ENTER("(\"%s\")",name);
GST_DEBUG (0,"stepping through pads\n");
do {
pads = element->pads;
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD(pad)) continue;
realpad = GST_REAL_PAD(pad);
if (GST_RPAD_DIRECTION(realpad) == GST_PAD_SINK) {
GST_DEBUG (0,"pulling a buffer from %s:%s\n", name, GST_PAD_NAME (pad));
buf = gst_pad_pull (pad);
GST_DEBUG (0,"calling chain function of %s:%s\n", name, GST_PAD_NAME (pad));
if (buf) GST_RPAD_CHAINFUNC(realpad) (pad,buf);
GST_DEBUG (0,"calling chain function of %s:%s done\n", name, GST_PAD_NAME (pad));
}
}
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));
GST_FLAG_UNSET(element,GST_ELEMENT_COTHREAD_STOPPING);
GST_DEBUG_LEAVE("(%d,'%s')",argc,name);
return 0;
}
static int
gst_bin_src_wrapper (int argc,char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
GList *pads;
GstRealPad *realpad;
GstBuffer *buf = NULL;
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GST_DEBUG_ENTER("(%d,\"%s\")",argc,name);
do {
pads = element->pads;
while (pads) {
if (!GST_IS_REAL_PAD(pads->data)) continue;
realpad = (GstRealPad*)(pads->data);
pads = g_list_next(pads);
if (GST_RPAD_DIRECTION(realpad) == GST_PAD_SRC) {
GST_DEBUG (0,"calling _getfunc for %s:%s\n",GST_DEBUG_PAD_NAME(realpad));
if (realpad->regiontype != GST_REGION_NONE) {
g_return_val_if_fail (GST_RPAD_GETREGIONFUNC(realpad) != NULL, 0);
// if (GST_RPAD_GETREGIONFUNC(realpad) == NULL)
// fprintf(stderr,"error, no getregionfunc in \"%s\"\n", name);
// else
buf = (GST_RPAD_GETREGIONFUNC(realpad))((GstPad*)realpad,realpad->regiontype,realpad->offset,realpad->len);
realpad->regiontype = GST_REGION_NONE;
} else {
g_return_val_if_fail (GST_RPAD_GETFUNC(realpad) != NULL, 0);
// if (GST_RPAD_GETFUNC(realpad) == NULL)
// fprintf(stderr,"error, no getfunc in \"%s\"\n", name);
// else
buf = GST_RPAD_GETFUNC(realpad) ((GstPad*)realpad);
}
GST_DEBUG (0,"calling gst_pad_push on pad %s:%s\n",GST_DEBUG_PAD_NAME(realpad));
if (buf) gst_pad_push ((GstPad*)realpad, buf);
}
}
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));
GST_FLAG_UNSET(element,GST_ELEMENT_COTHREAD_STOPPING);
GST_DEBUG_LEAVE("");
return 0;
}
static void
gst_bin_pushfunc_proxy (GstPad *pad, GstBuffer *buf)
{
cothread_state *threadstate = GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate;
GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
GST_DEBUG (GST_CAT_DATAFLOW,"putting buffer %p in peer's pen\n",buf);
// FIXME this should be bounded
// loop until the bufferpen is empty so we can fill it up again
while (GST_RPAD_BUFPEN(pad) != NULL) {
GST_DEBUG (GST_CAT_DATAFLOW, "switching to %p to empty bufpen\n",threadstate);
cothread_switch (threadstate);
}
// now fill the bufferpen and switch so it can be consumed
GST_RPAD_BUFPEN(GST_RPAD_PEER(pad)) = buf;
GST_DEBUG (GST_CAT_DATAFLOW,"switching to %p (@%p)\n",threadstate,&(GST_ELEMENT(GST_PAD_PARENT(pad))->threadstate));
cothread_switch (threadstate);
GST_DEBUG (GST_CAT_DATAFLOW,"done switching\n");
}
static GstBuffer*
gst_bin_pullfunc_proxy (GstPad *pad)
{
GstBuffer *buf;
cothread_state *threadstate = GST_ELEMENT(GST_PAD_PARENT(pad))->threadstate;
GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
// FIXME this should be bounded
// we will loop switching to the peer until it's filled up the bufferpen
while (GST_RPAD_BUFPEN(pad) == NULL) {
GST_DEBUG (GST_CAT_DATAFLOW, "switching to %p to fill bufpen\n",threadstate);
cothread_switch (threadstate);
}
GST_DEBUG (GST_CAT_DATAFLOW,"done switching\n");
// now grab the buffer from the pen, clear the pen, and return the buffer
buf = GST_RPAD_BUFPEN(pad);
GST_RPAD_BUFPEN(pad) = NULL;
return buf;
}
static GstBuffer*
gst_bin_pullregionfunc_proxy (GstPad *pad,GstRegionType type,guint64 offset,guint64 len)
{
GstBuffer *buf;
cothread_state *threadstate = GST_ELEMENT(GST_PAD_PARENT(pad))->threadstate;
GST_DEBUG_ENTER("%s:%s,%d,%lld,%lld",GST_DEBUG_PAD_NAME(pad),type,offset,len);
// put the region info into the pad
GST_RPAD_REGIONTYPE(pad) = type;
GST_RPAD_OFFSET(pad) = offset;
GST_RPAD_LEN(pad) = len;
// FIXME this should be bounded
// we will loop switching to the peer until it's filled up the bufferpen
while (GST_RPAD_BUFPEN(pad) == NULL) {
GST_DEBUG (GST_CAT_DATAFLOW, "switching to %p to fill bufpen\n",threadstate);
cothread_switch (threadstate);
}
GST_DEBUG (GST_CAT_DATAFLOW,"done switching\n");
// now grab the buffer from the pen, clear the pen, and return the buffer
buf = GST_RPAD_BUFPEN(pad);
GST_RPAD_BUFPEN(pad) = NULL;
return buf;
}
static void
gst_schedule_cothreaded_chain (GstBin *bin, _GstBinChain *chain) {
GList *elements;
GstElement *element;
cothread_func wrapper_function;
GList *pads;
GstPad *pad;
GST_DEBUG (0,"chain is using cothreads\n");
// first create thread context
if (bin->threadcontext == NULL) {
GST_DEBUG (0,"initializing cothread context\n");
bin->threadcontext = cothread_init ();
}
// walk through all the chain's elements
elements = chain->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
// start out without a wrapper function, we select it later
wrapper_function = NULL;
// if the element has a loopfunc...
if (element->loopfunc != NULL) {
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_loopfunc_wrapper);
GST_DEBUG (0,"\nelement '%s' is a loop-based\n",GST_ELEMENT_NAME(element));
} else {
// otherwise we need to decide what kind of cothread
// if it's not DECOUPLED, we decide based on whether it's a source or not
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED)) {
// if it doesn't have any sinks, it must be a source (duh)
if (element->numsinkpads == 0) {
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_src_wrapper);
GST_DEBUG (0,"\nelement '%s' is a source, using _src_wrapper\n",GST_ELEMENT_NAME(element));
} else {
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_chain_wrapper);
GST_DEBUG (0,"\nelement '%s' is a filter, using _chain_wrapper\n",GST_ELEMENT_NAME(element));
}
}
}
// now we have to walk through the pads to set up their state
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD(pad)) continue;
// if the element is DECOUPLED or outside the manager, we have to chain
if ((wrapper_function == NULL) ||
(GST_ELEMENT (GST_PAD_PARENT (GST_PAD (GST_RPAD_PEER (pad))))->manager != GST_ELEMENT(bin))) {
// set the chain proxies
if (GST_RPAD_DIRECTION(pad) == GST_PAD_SINK) {
GST_DEBUG (0,"copying chain function into push proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_PUSHFUNC(pad) = GST_RPAD_CHAINFUNC(pad);
} else {
GST_DEBUG (0,"copying get function into pull proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_PULLFUNC(pad) = GST_RPAD_GETFUNC(pad);
GST_RPAD_PULLREGIONFUNC(pad) = GST_RPAD_GETREGIONFUNC(pad);
}
// otherwise we really are a cothread
} else {
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
GST_DEBUG (0,"setting cothreaded push proxy for sinkpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_PUSHFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pushfunc_proxy);
} else {
GST_DEBUG (0,"setting cothreaded pull proxy for srcpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_PULLFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_proxy);
GST_RPAD_PULLREGIONFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pullregionfunc_proxy);
}
}
}
// need to set up the cothread now
if (wrapper_function != NULL) {
if (element->threadstate == NULL) {
// FIXME handle cothread_create returning NULL
element->threadstate = cothread_create (bin->threadcontext);
GST_DEBUG (0,"created cothread %p for '%s'\n",element->threadstate,GST_ELEMENT_NAME(element));
}
cothread_setfunc (element->threadstate, wrapper_function, 0, (char **)element);
GST_DEBUG (0,"set wrapper function for '%s' to &%s\n",GST_ELEMENT_NAME(element),
GST_DEBUG_FUNCPTR_NAME(wrapper_function));
}
}
}
static void
gst_schedule_chained_chain (GstBin *bin, _GstBinChain *chain) {
GList *elements;
GstElement *element;
GList *pads;
GstPad *pad;
GST_DEBUG (0,"chain entered\n");
// walk through all the elements
elements = chain->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
// walk through all the pads
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD(pad)) continue;
if (GST_RPAD_DIRECTION(pad) == GST_PAD_SINK) {
GST_DEBUG (0,"copying chain function into push proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_PUSHFUNC(pad) = GST_RPAD_CHAINFUNC(pad);
} else {
GST_DEBUG (0,"copying get function into pull proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_PULLFUNC(pad) = GST_RPAD_GETFUNC(pad);
GST_RPAD_PULLREGIONFUNC(pad) = GST_RPAD_GETREGIONFUNC(pad);
}
}
}
}
static void
gst_bin_schedule_cleanup (GstBin *bin)
{
GList *chains;
_GstBinChain *chain;
chains = bin->chains;
while (chains) {
chain = (_GstBinChain *)(chains->data);
chains = g_list_next(chains);
g_list_free(chain->elements);
g_list_free(chain->entries);
g_free(chain);
}
g_list_free(bin->chains);
bin->chains = NULL;
}
static void
gst_scheduler_handle_eos (GstElement *element, _GstBinChain *chain)
{
GST_DEBUG (0,"chain removed from scheduler, EOS from element \"%s\"\n", GST_ELEMENT_NAME (element));
chain->need_scheduling = FALSE;
}
void gst_bin_schedule_func(GstBin *bin) {
GList *elements;
GstElement *element;
GSList *pending = NULL;
GList *pads;
GstPad *pad;
GstElement *peerparent;
GList *chains;
_GstBinChain *chain;
GST_DEBUG_ENTER("(\"%s\")",GST_ELEMENT_NAME (GST_ELEMENT (bin)));
gst_bin_schedule_cleanup(bin);
// next we have to find all the separate scheduling chains
GST_DEBUG (0,"\nattempting to find scheduling chains...\n");
// first make a copy of the managed_elements we can mess with
elements = g_list_copy (bin->managed_elements);
// we have to repeat until the list is empty to get all chains
while (elements) {
element = GST_ELEMENT (elements->data);
// if this is a DECOUPLED element
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED)) {
// skip this element entirely
GST_DEBUG (0,"skipping '%s' because it's decoupled\n",GST_ELEMENT_NAME(element));
elements = g_list_next (elements);
continue;
}
GST_DEBUG (0,"starting with element '%s'\n",GST_ELEMENT_NAME(element));
// prime the pending list with the first element off the top
pending = g_slist_prepend (NULL, element);
// and remove that one from the main list
elements = g_list_remove (elements, element);
// create a chain structure
chain = g_new0 (_GstBinChain, 1);
chain->need_scheduling = TRUE;
// for each pending element, walk the pipeline
do {
// retrieve the top of the stack and pop it
element = GST_ELEMENT (pending->data);
pending = g_slist_remove (pending, element);
// add ourselves to the chain's list of elements
GST_DEBUG (0,"adding '%s' to chain\n",GST_ELEMENT_NAME(element));
chain->elements = g_list_prepend (chain->elements, element);
chain->num_elements++;
gtk_signal_connect (GTK_OBJECT (element), "eos", gst_scheduler_handle_eos, chain);
// set the cothreads flag as appropriate
if (GST_FLAG_IS_SET (element, GST_ELEMENT_USE_COTHREAD))
chain->need_cothreads = TRUE;
if (bin->use_cothreads == TRUE)
chain->need_cothreads = TRUE;
// if we're managed by the current bin, and we're not decoupled,
// go find all the peers and add them to the list of elements to check
if ((element->manager == GST_ELEMENT(bin)) &&
!GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED)) {
// remove ourselves from the outer list of all managed elements
// GST_DEBUG (0,"removing '%s' from list of possible elements\n",GST_ELEMENT_NAME(element));
elements = g_list_remove (elements, element);
// if this element is a source, add it as an entry
if (element->numsinkpads == 0) {
chain->entries = g_list_prepend (chain->entries, element);
GST_DEBUG (0,"added '%s' as SRC entry into the chain\n",GST_ELEMENT_NAME(element));
}
// now we have to walk the pads to find peers
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD(pad)) continue;
GST_DEBUG (0,"have pad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
if (GST_RPAD_PEER(pad) == NULL) GST_ERROR(pad,"peer is null!");
g_assert(GST_RPAD_PEER(pad) != NULL);
g_assert(GST_PAD_PARENT (GST_PAD(GST_RPAD_PEER(pad))) != NULL);
peerparent = GST_ELEMENT(GST_PAD_PARENT (GST_PAD(GST_RPAD_PEER(pad))));
GST_DEBUG (0,"peer pad %p\n", GST_RPAD_PEER(pad));
// only bother with if the pad's peer's parent is this bin or it's DECOUPLED
// only add it if it's in the list of un-visited elements still
if ((g_list_find (elements, peerparent) != NULL) ||
GST_FLAG_IS_SET (peerparent, GST_ELEMENT_DECOUPLED)) {
// add the peer element to the pending list
GST_DEBUG (0,"adding '%s' to list of pending elements\n",
GST_ELEMENT_NAME(peerparent));
pending = g_slist_prepend (pending, peerparent);
// if this is a sink pad, then the element on the other side is an entry
if ((GST_RPAD_DIRECTION(pad) == GST_PAD_SINK) &&
(GST_FLAG_IS_SET (peerparent, GST_ELEMENT_DECOUPLED))) {
chain->entries = g_list_prepend (chain->entries, peerparent);
gtk_signal_connect (GTK_OBJECT (peerparent), "eos", gst_scheduler_handle_eos, chain);
GST_DEBUG (0,"added '%s' as DECOUPLED entry into the chain\n",GST_ELEMENT_NAME(peerparent));
}
} else
GST_DEBUG (0,"element '%s' has already been dealt with\n",GST_ELEMENT_NAME(peerparent));
}
}
} while (pending);
// add the chain to the bin
GST_DEBUG (0,"have chain with %d elements: ",chain->num_elements);
{ GList *elements = chain->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next(elements);
GST_DEBUG_NOPREFIX(0,"%s, ",GST_ELEMENT_NAME(element));
}
}
GST_DEBUG_NOPREFIX(0,"\n");
bin->chains = g_list_prepend (bin->chains, chain);
bin->num_chains++;
}
// free up the list in case it's full of DECOUPLED elements
g_list_free (elements);
GST_DEBUG (0,"\nwe have %d chains to schedule\n",bin->num_chains);
// now we have to go through all the chains and schedule them
chains = bin->chains;
while (chains) {
chain = (_GstBinChain *)(chains->data);
chains = g_list_next (chains);
// schedule as appropriate
if (chain->need_cothreads) {
gst_schedule_cothreaded_chain (bin,chain);
} else {
gst_schedule_chained_chain (bin,chain);
}
}
GST_DEBUG_LEAVE("(\"%s\")",GST_ELEMENT_NAME(GST_ELEMENT(bin)));
}
/*
// ***** check for possible connections outside
// get the pad's peer
peer = gst_pad_get_peer (pad);
// FIXME this should be an error condition, if not disabled
if (!peer) break;
// get the parent of the peer of the pad
outside = GST_ELEMENT (gst_pad_get_parent (peer));
// FIXME this should *really* be an error condition
if (!outside) break;
// if it's a source or connection and it's not ours...
if ((GST_IS_SRC (outside) || GST_IS_CONNECTION (outside)) &&
(gst_object_get_parent (GST_OBJECT (outside)) != GST_OBJECT (bin))) {
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
GST_DEBUG (0,"dealing with outside source element %s\n",GST_ELEMENT_NAME(outside));
// GST_DEBUG (0,"PUNT: copying pullfunc ptr from %s:%s to %s:%s (@ %p)\n",
//GST_DEBUG_PAD_NAME(pad->peer),GST_DEBUG_PAD_NAME(pad),&pad->pullfunc);
// pad->pullfunc = pad->peer->pullfunc;
// GST_DEBUG (0,"PUNT: setting pushfunc proxy to fake proxy on %s:%s\n",GST_DEBUG_PAD_NAME(pad->peer));
// pad->peer->pushfunc = GST_DEBUG_FUNCPTR(gst_bin_pushfunc_fake_proxy);
GST_RPAD_PULLFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_proxy);
GST_RPAD_PULLREGIONFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pullregionfunc_proxy);
}
} else {
*/
/*
} else if (GST_IS_SRC (element)) {
GST_DEBUG (0,"adding '%s' as entry point, because it's a source\n",GST_ELEMENT_NAME (element));
bin->entries = g_list_prepend (bin->entries,element);
bin->num_entries++;
cothread_setfunc(element->threadstate,gst_bin_src_wrapper,0,(char **)element);
}
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD(pads->data);
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
GST_DEBUG (0,"setting push proxy for sinkpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
// set the proxy functions
pad->pushfunc = GST_DEBUG_FUNCPTR(gst_bin_pushfunc_proxy);
GST_DEBUG (0,"pushfunc %p = gst_bin_pushfunc_proxy %p\n",&pad->pushfunc,gst_bin_pushfunc_proxy);
} else if (gst_pad_get_direction (pad) == GST_PAD_SRC) {
GST_DEBUG (0,"setting pull proxies for srcpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
// set the proxy functions
GST_RPAD_PULLFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_proxy);
GST_RPAD_PULLREGIONFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pullregionfunc_proxy);
GST_DEBUG (0,"pad->pullfunc(@%p) = gst_bin_pullfunc_proxy(@%p)\n",
&pad->pullfunc,gst_bin_pullfunc_proxy);
pad->pullregionfunc = GST_DEBUG_FUNCPTR(gst_bin_pullregionfunc_proxy);
}
pads = g_list_next (pads);
}
elements = g_list_next (elements);
// if there are no entries, we have to pick one at random
if (bin->num_entries == 0)
bin->entries = g_list_prepend (bin->entries, GST_ELEMENT(bin->children->data));
}
} else {
GST_DEBUG (0,"don't need cothreads, looking for entry points\n");
// we have to find which elements will drive an iteration
elements = bin->children;
while (elements) {
element = GST_ELEMENT (elements->data);
GST_DEBUG (0,"found element \"%s\"\n", GST_ELEMENT_NAME (element));
if (GST_IS_BIN (element)) {
gst_bin_create_plan (GST_BIN (element));
}
if (GST_IS_SRC (element)) {
GST_DEBUG (0,"adding '%s' as entry point, because it's a source\n",GST_ELEMENT_NAME (element));
bin->entries = g_list_prepend (bin->entries, element);
bin->num_entries++;
}
// go through all the pads, set pointers, and check for connections
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
GST_DEBUG (0,"found SINK pad %s:%s\n", GST_DEBUG_PAD_NAME(pad));
// copy the peer's chain function, easy enough
GST_DEBUG (0,"copying peer's chainfunc to %s:%s's pushfunc\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_PUSHFUNC(pad) = GST_DEBUG_FUNCPTR(GST_RPAD_CHAINFUNC(GST_RPAD_PEER(pad)));
// need to walk through and check for outside connections
//FIXME need to do this for all pads
// get the pad's peer
peer = GST_RPAD_PEER(pad);
if (!peer) {
GST_DEBUG (0,"found SINK pad %s has no peer\n", GST_ELEMENT_NAME (pad));
break;
}
// get the parent of the peer of the pad
outside = GST_ELEMENT (GST_RPAD_PARENT(peer));
if (!outside) break;
// if it's a connection and it's not ours...
if (GST_IS_CONNECTION (outside) &&
(gst_object_get_parent (GST_OBJECT (outside)) != GST_OBJECT (bin))) {
gst_info("gstbin: element \"%s\" is the external source Connection "
"for internal element \"%s\"\n",
GST_ELEMENT_NAME (GST_ELEMENT (outside)),
GST_ELEMENT_NAME (GST_ELEMENT (element)));
bin->entries = g_list_prepend (bin->entries, outside);
bin->num_entries++;
}
}
else {
GST_DEBUG (0,"found pad %s\n", GST_ELEMENT_NAME (pad));
}
pads = g_list_next (pads);
}
elements = g_list_next (elements);
}
*/
/*
// If cothreads are needed, we need to not only find elements but
// set up cothread states and various proxy functions.
if (bin->need_cothreads) {
GST_DEBUG (0,"bin is using cothreads\n");
// first create thread context
if (bin->threadcontext == NULL) {
GST_DEBUG (0,"initializing cothread context\n");
bin->threadcontext = cothread_init ();
}
// walk through all the children
elements = bin->managed_elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
// start out with a NULL warpper function, we'll set it if we want a cothread
wrapper_function = NULL;
// have to decide if we need to or can use a cothreads, and if so which wrapper
// first of all, if there's a loopfunc, the decision's already made
if (element->loopfunc != NULL) {
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_loopfunc_wrapper);
GST_DEBUG (0,"element %s is a loopfunc, must use a cothread\n",GST_ELEMENT_NAME (element));
} else {
// otherwise we need to decide if it needs a cothread
// if it's complex, or cothreads are preferred and it's *not* decoupled, cothread it
if (GST_FLAG_IS_SET (element,GST_ELEMENT_COMPLEX) ||
(GST_FLAG_IS_SET (bin,GST_BIN_FLAG_PREFER_COTHREADS) &&
!GST_FLAG_IS_SET (element,GST_ELEMENT_DECOUPLED))) {
// base it on whether we're going to loop through source or sink pads
if (element->numsinkpads == 0)
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_src_wrapper);
else
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_chain_wrapper);
}
}
// walk through the all the pads for this element, setting proxy functions
// the selection of proxy functions depends on whether we're in a cothread or not
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
// check to see if someone else gets to set up the element
peer_manager = GST_ELEMENT((pad)->peer->parent)->manager;
if (peer_manager != GST_ELEMENT(bin)) {
GST_DEBUG (0,"WARNING: pad %s:%s is connected outside of bin\n",GST_DEBUG_PAD_NAME(pad));
}
// if the wrapper_function is set, we need to use the proxy functions
if (wrapper_function != NULL) {
// set up proxy functions
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
GST_DEBUG (0,"setting push proxy for sinkpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
pad->pushfunc = GST_DEBUG_FUNCPTR(gst_bin_pushfunc_proxy);
} else if (gst_pad_get_direction (pad) == GST_PAD_SRC) {
GST_DEBUG (0,"setting pull proxy for srcpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_PULLFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_proxy);
GST_RPAD_PULLREGIONFUNC(pad) = GST_DEBUG_FUNCPTR(gst_bin_pullregionfunc_proxy);
}
} else {
// otherwise we need to set up for 'traditional' chaining
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
// we can just copy the chain function, since it shares the prototype
GST_DEBUG (0,"copying chain function into push proxy for %s:%s\n",
GST_DEBUG_PAD_NAME(pad));
pad->pushfunc = pad->chainfunc;
} else if (gst_pad_get_direction (pad) == GST_PAD_SRC) {
// we can just copy the get function, since it shares the prototype
GST_DEBUG (0,"copying get function into pull proxy for %s:%s\n",
GST_DEBUG_PAD_NAME(pad));
pad->pullfunc = pad->getfunc;
}
}
}
// if a loopfunc has been specified, create and set up a cothread
if (wrapper_function != NULL) {
if (element->threadstate == NULL) {
element->threadstate = cothread_create (bin->threadcontext);
GST_DEBUG (0,"created cothread %p (@%p) for \"%s\"\n",element->threadstate,
&element->threadstate,GST_ELEMENT_NAME (element));
}
cothread_setfunc (element->threadstate, wrapper_function, 0, (char **)element);
GST_DEBUG (0,"set wrapper function for \"%s\" to &%s\n",GST_ELEMENT_NAME (element),
GST_DEBUG_FUNCPTR_NAME(wrapper_function));
}
// // HACK: if the element isn't decoupled, it's an entry
// if (!GST_FLAG_IS_SET(element,GST_ELEMENT_DECOUPLED))
// bin->entries = g_list_append(bin->entries, element);
}
// otherwise, cothreads are not needed
} else {
GST_DEBUG (0,"bin is chained, no cothreads needed\n");
elements = bin->managed_elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
GST_DEBUG (0,"copying chain function into push proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
pad->pushfunc = pad->chainfunc;
} else {
GST_DEBUG (0,"copying get function into pull proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
pad->pullfunc = pad->getfunc;
}
}
}
}
*/
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