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gstreamer/gst/gstscheduler.c
Wim Taymans fdaa2307da A very small change to make eos somewhat work. no inner bins are checked. 
Original commit message from CVS:
A very small change to make eos somewhat work. no inner bins are checked.
When an element fires EOS, the chain with that element is removed from
the scheduler (marked inactive). If all chains are inactive, the bin
fires EOS.
2001-01-20 03:10:44 +00:00

725 lines
27 KiB
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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_get_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_get_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_get_name (pad));
buf = gst_pad_pull (pad);
GST_DEBUG (0,"calling chain function of %s:%s\n", name, gst_pad_get_name (pad));
GST_RPAD_CHAINFUNC(realpad) (pad,buf);
GST_DEBUG (0,"calling chain function of %s:%s done\n", name, gst_pad_get_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;
G_GNUC_UNUSED const gchar *name = gst_element_get_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) {
// region_struct *region = cothread_get_data (element->threadstate, "region");
GST_DEBUG (0,"calling _getfunc for %s:%s\n",GST_DEBUG_PAD_NAME(realpad));
// if (region) {
// gst_src_push_region (GST_SRC (element), region->offset, region->size);
// if (GST_RPAD_GETREGIONFUNC(realpad) == NULL)
// fprintf(stderr,"error, no getregionfunc in \"%s\"\n", name);
// buf = (GST_RPAD_GETREGIONFUNC(realpad))((GstPad*)realpad, region->offset, region->size);
// } else {
if (GST_RPAD_GETFUNC(realpad) == NULL)
fprintf(stderr,"error, no getfunc in \"%s\"\n", name);
buf = GST_RPAD_GETFUNC(realpad) ((GstPad*)realpad);
// }
GST_DEBUG (0,"calling gst_pad_push on pad %s:%s\n",GST_DEBUG_PAD_NAME(realpad));
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(pad->parent)->threadstate;
GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
GST_DEBUG (0,"putting buffer %p in peer's pen\n",buf);
GST_RPAD_BUFPEN(GST_RPAD_PEER(pad)) = buf;
GST_DEBUG (0,"switching to %p (@%p)\n",threadstate,&(GST_ELEMENT(GST_PAD_PARENT(pad))->threadstate));
cothread_switch (threadstate);
GST_DEBUG (0,"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 a while
if (GST_RPAD_BUFPEN(pad) == NULL) {
GST_DEBUG (0,"switching to %p (@%p)\n",threadstate,&(GST_ELEMENT(GST_PAD_PARENT(pad))->threadstate));
cothread_switch (threadstate);
}
GST_DEBUG (0,"done switching\n");
buf = GST_RPAD_BUFPEN(pad);
GST_RPAD_BUFPEN(pad) = NULL;
return buf;
}
static GstBuffer *
gst_bin_chainfunc_proxy (GstPad *pad)
{
// FIXME!!
// GstBuffer *buf;
return NULL;
}
// FIXME!!!
static void
gst_bin_pullregionfunc_proxy (GstPad *pad,
gulong offset,
gulong size)
{
// region_struct region;
cothread_state *threadstate;
GST_DEBUG_ENTER("%s:%s,%ld,%ld",GST_DEBUG_PAD_NAME(pad),offset,size);
// region.offset = offset;
// region.size = size;
// threadstate = GST_ELEMENT(pad->parent)->threadstate;
// cothread_set_data (threadstate, "region", &region);
cothread_switch (threadstate);
// cothread_set_data (threadstate, "region", NULL);
}
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_get_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_get_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_get_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(GST_RPAD_PEER(pad))->parent)->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);
}
}
}
// need to set up the cothread now
if (wrapper_function != NULL) {
if (element->threadstate == NULL) {
element->threadstate = cothread_create (bin->threadcontext);
GST_DEBUG (0,"created cothread %p for '%s'\n",element->threadstate,gst_element_get_name(element));
}
cothread_setfunc (element->threadstate, wrapper_function, 0, (char **)element);
GST_DEBUG (0,"set wrapper function for '%s' to &%s\n",gst_element_get_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_get_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_get_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_get_name(element));
elements = g_list_next (elements);
continue;
}
GST_DEBUG (0,"starting with element '%s'\n",gst_element_get_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_get_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_get_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_get_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(GST_RPAD_PEER(pad))->parent != NULL);
peerparent = GST_ELEMENT(GST_PAD(GST_RPAD_PEER(pad))->parent);
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_get_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);
GST_DEBUG (0,"added '%s' as DECOUPLED entry into the chain\n",gst_element_get_name(peerparent));
}
} else
GST_DEBUG (0,"element '%s' has already been dealt with\n",gst_element_get_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_get_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_get_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_get_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);
pad->pullfunc = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_proxy);
}
} else {
*/
/*
} else if (GST_IS_SRC (element)) {
GST_DEBUG (0,"adding '%s' as entry point, because it's a source\n",gst_element_get_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
pad->pullfunc = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_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_get_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_get_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_pad_get_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_get_name (GST_ELEMENT (outside)),
gst_element_get_name (GST_ELEMENT (element)));
bin->entries = g_list_prepend (bin->entries, outside);
bin->num_entries++;
}
}
else {
GST_DEBUG (0,"found pad %s\n", gst_pad_get_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_get_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));
pad->pullfunc = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_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_get_name(element));
}
cothread_setfunc (element->threadstate, wrapper_function, 0, (char **)element);
GST_DEBUG (0,"set wrapper function for \"%s\" to &%s\n",gst_element_get_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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