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gstreamer/gst/gstparse.c
Richard Boulton 1c3b5dc57b Allow elements to be given custom names with [] syntax. ie, gstreamer-launch disksrc[mysrc] ! ... 
Original commit message from CVS:
Allow elements to be given custom names with [] syntax.

ie, gstreamer-launch disksrc[mysrc] ! ...
makes a disksrc element named mysrc, rather than disksrc0

Suggestion: don't name things with names with numbers at the end, or they
may conflict with names allocated automatically.
2001-06-29 17:53:02 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* :
*
* 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 DEBUG(format,args...)
#define DEBUG_NOPREFIX(format,args...)
#define VERBOSE(format,args...)
#define GST_PARSE_LISTPAD(list) ((GstPad*)(list->data))
#include <string.h>
#include "gst_private.h"
#include "gstparse.h"
#include "gstpipeline.h"
#include "gstthread.h"
#include "gstutils.h"
typedef struct _gst_parse_priv gst_parse_priv;
struct _gst_parse_priv {
guint bincount;
guint threadcount;
gint binlevel;
GHashTable *elementcounts;
gboolean verbose;
gboolean debug;
};
typedef struct _gst_parse_delayed_pad gst_parse_delayed_pad;
struct _gst_parse_delayed_pad {
gchar *name;
GstPad *peer;
};
/* FIXME need to either revive this, or have pad->padtemplate connections in core
static void
gst_parse_newpad(GstElement *element,GstPad *pad,launch_delayed_pad *peer)
{
gst_info("have NEW_PAD signal\n");
// if it matches, connect it
if (!strcmp(GST_PAD_NAME(pad),peer->name)) {
gst_pad_connect(pad,peer->peer);
gst_info("delayed connect of '%s' to '%s'\n",
GST_PAD_NAME(pad),GST_PAD_NAME(peer->peer));
}
}
*/
typedef struct {
gchar *srcpadname;
GstPad *target;
} dyn_connect;
static void have_eos (void)
{
DEBUG ("I have eos on the first element\n");
exit (0);
}
static void
dynamic_connect (GstElement *element, GstPad *newpad, gpointer data)
{
dyn_connect *connect = (dyn_connect *)data;
if (!strcmp (gst_pad_get_name (newpad), connect->srcpadname)) {
gst_pad_connect (newpad, connect->target);
}
}
static gchar *
gst_parse_unique_name(gchar *type,gst_parse_priv *priv)
{
gint count;
count = GPOINTER_TO_INT(g_hash_table_lookup(priv->elementcounts,type));
count++;
g_hash_table_insert(priv->elementcounts,type,GINT_TO_POINTER(count));
return g_strdup_printf("%s%d",type,count-1);
}
static gint
gst_parse_launch_cmdline(int argc,char *argv[],GstBin *parent,gst_parse_priv *priv)
{
gint i = 0, j = 0;
gchar *arg;
GstElement *element = NULL, *previous = NULL, *prevelement = NULL;
gchar closingchar = '\0';
gint len;
gchar *ptr;
gchar *sinkpadname = NULL, *srcpadname = NULL, *tempname;
GstPad *temppad;
GSList *sinkpads = NULL, *srcpads = NULL;
gint numsrcpads = 0, numsinkpads = 0;
GList *pads;
gint elementcount = 0;
gint retval = 0;
priv->binlevel++;
if (GST_IS_PIPELINE(parent)) { closingchar = '\0';DEBUG("in pipeline "); }
else if (GST_IS_THREAD(parent)) { closingchar = '}';DEBUG("in thread "); }
else { closingchar = ')';DEBUG("in bin "); }
DEBUG_NOPREFIX("%s\n",GST_ELEMENT_NAME (GST_ELEMENT (parent)));
while (i < argc) {
arg = argv[i];
// FIXME this is a lame solution for problems with the first parser
if (arg == NULL) { i++;continue; }
len = strlen(arg);
element = NULL;
DEBUG("** ARGUMENT is '%s'\n",arg);
// a null that slipped through the reconstruction
if (len == 0) {
DEBUG("random arg, FIXME\n");
i++;
continue;
// end of the container
} else if (arg[0] == closingchar) {
// time to finish off this bin
DEBUG("exiting container %s\n",GST_ELEMENT_NAME (GST_ELEMENT (parent)));
retval = i+1;
break;
// a pad connection
} else if ((ptr = strchr(arg,'!'))) {
DEBUG("attempting to connect pads together....\n");
// if it starts with the !
if (arg[0] == '!') {
srcpadname = NULL;
// if there's a sinkpad...
if (len > 1)
sinkpadname = &arg[1];
else
sinkpadname = NULL;
} else {
srcpadname = g_strndup(arg,(ptr-arg));
// if there's a sinkpad
if (len > (ptr-arg)+1)
sinkpadname = &ptr[1];
else
sinkpadname = NULL;
}
GST_DEBUG(0,"have srcpad %s, sinkpad %s\n",srcpadname,sinkpadname);
g_slist_free(srcpads);
srcpads = NULL;
numsrcpads=0;
tempname=NULL;
// find src pads
if (srcpadname != NULL) {
while (1){
// split name at commas
if ((ptr = strchr(srcpadname,','))){
tempname = g_strndup(srcpadname,(ptr-srcpadname));
srcpadname = &ptr[1];
} else {
tempname = srcpadname;
}
// look for pad with that name
if ((temppad = gst_element_get_pad(previous,tempname))){
srcpads = g_slist_append(srcpads,temppad);
numsrcpads++;
}
// try to create a pad using that padtemplate name
else if ((temppad = gst_element_request_pad_by_name(previous,tempname))) {
srcpads = g_slist_append(srcpads,temppad);
numsrcpads++;
}
if (!temppad) {
GST_DEBUG(0,"NO SUCH pad %s in element %s\n",tempname,GST_ELEMENT_NAME(previous));
} else {
GST_DEBUG(0,"have src pad %s:%s\n",GST_DEBUG_PAD_NAME(temppad));
}
// if there is no more commas in srcpadname then we're done
if (tempname == srcpadname) break;
g_free(tempname);
}
}
else {
// check through the list to find the first sink pad
GST_DEBUG(0,"CHECKING through element %s for pad named %s\n",GST_ELEMENT_NAME(previous),srcpadname);
pads = gst_element_get_pad_list(previous);
while (pads) {
temppad = GST_PARSE_LISTPAD(pads);
GST_DEBUG(0,"have pad %s:%s\n",GST_DEBUG_PAD_NAME(temppad));
if (GST_IS_GHOST_PAD(temppad)) GST_DEBUG(0,"it's a ghost pad\n");
if (gst_pad_get_direction (temppad) == GST_PAD_SRC){
srcpads = g_slist_append(srcpads,temppad);
numsrcpads++;
break;
}
pads = g_list_next (pads);
}
if (!srcpads) GST_DEBUG(0,"error, can't find a src pad!!!\n");
else GST_DEBUG(0,"have src pad %s:%s\n",GST_DEBUG_PAD_NAME(GST_PARSE_LISTPAD(srcpads)));
}
// argument with = in it
} else if (strstr(arg, "=")) {
gchar * argname;
gchar * argval;
gchar * pos = strstr(arg, "=");
// we have an argument
argname = arg;
pos[0] = '\0';
argval = pos+1;
GST_DEBUG(0,"attempting to set argument '%s' to '%s' on element '%s'\n",
argname,argval,GST_ELEMENT_NAME(previous));
gst_util_set_object_arg (G_OBJECT(previous), argname, argval);
g_free(argname);
// element or argument, or beginning of bin or thread
} else if (arg[0] == '[') {
// we have the start of a name of the preceding element.
// rename previous element to next arg.
if (arg[1] != '\0') {
fprintf(stderr,"error, unexpected junk after [\n");
exit(-1);
}
i++;
if (i < argc) {
gst_element_set_name(previous, argv[i]);
} else {
fprintf(stderr,"error, expected element name, found end of arguments\n");
exit(-1);
}
i++;
if (i >= argc) {
fprintf(stderr,"error, expected ], found end of arguments\n");
exit(-1);
} else if (strcmp(argv[i], "]") != 0) {
fprintf(stderr,"error, expected ], found '%s'\n", argv[i]);
exit(-1);
}
} else {
DEBUG("have element or bin/thread\n");
// if we have a bin or thread starting
if (strchr("({",arg[0])) {
if (arg[0] == '(') {
// create a bin and add it to the current parent
element = gst_bin_new(g_strdup_printf("bin%d",priv->bincount++));
if (!element) {
fprintf(stderr,"Couldn't create a bin!\n");
// exit(-1);
}
GST_DEBUG(0,"CREATED bin %s\n",GST_ELEMENT_NAME(element));
} else if (arg[0] == '{') {
// create a thread and add it to the current parent
element = gst_thread_new(g_strdup_printf("thread%d",priv->threadcount++));
if (!element) {
fprintf(stderr,"Couldn't create a thread!\n");
// exit(-1);
}
GST_DEBUG(0,"CREATED thread %s\n",GST_ELEMENT_NAME(element));
} else {
DEBUG("error in parser, unexpected symbol, FIXME\n");
i++;
continue;
}
i += gst_parse_launch_cmdline(argc - i, argv + i + 1, GST_BIN (element), priv);
} else {
// we have an element
DEBUG("attempting to create element '%s'\n",arg);
ptr = gst_parse_unique_name(arg,priv);
element = gst_elementfactory_make(arg,ptr);
g_free(ptr);
if (!element) {
fprintf(stderr,"Couldn't create a '%s', no such element or need to run gstreamer-register?\n",arg);
exit(-1);
}
GST_DEBUG(0,"CREATED element %s\n",GST_ELEMENT_NAME(element));
}
gst_bin_add (GST_BIN (parent), element);
elementcount++;
g_slist_free(sinkpads);
sinkpads = NULL;
numsinkpads=0;
tempname=NULL;
// find sink pads
if (sinkpadname != NULL) {
while (1){
// split name at commas
if ((ptr = strchr(sinkpadname,','))){
tempname = g_strndup(sinkpadname,(ptr-sinkpadname));
sinkpadname = &ptr[1];
} else {
tempname = sinkpadname;
}
// look for pad with that name
if ((temppad = gst_element_get_pad(element,tempname))){
sinkpads = g_slist_append(sinkpads,temppad);
numsinkpads++;
}
// try to create a pad using that padtemplate name
else if ((temppad = gst_element_request_pad_by_name(element,tempname))) {
sinkpads = g_slist_append(sinkpads,temppad);
numsinkpads++;
}
if (!temppad) {
GST_DEBUG(0,"NO SUCH pad %s in element %s\n",tempname,GST_ELEMENT_NAME(element));
} else {
GST_DEBUG(0,"have sink pad %s:%s\n",GST_DEBUG_PAD_NAME(temppad));
}
// if there is no more commas in sinkpadname then we're done
if (tempname == sinkpadname) break;
g_free(tempname);
}
}
else {
// check through the list to find the first sink pad
pads = gst_element_get_pad_list(element);
while (pads) {
temppad = GST_PAD(pads->data);
pads = g_list_next (pads);
if (gst_pad_get_direction (temppad) == GST_PAD_SINK){
sinkpads = g_slist_append(sinkpads,temppad);
numsinkpads++;
break;
}
}
}
if (!sinkpads) GST_DEBUG(0,"can't find a sink pad for %s\n", gst_element_get_name (previous));
else GST_DEBUG(0,"have sink pad %s:%s\n",GST_DEBUG_PAD_NAME(GST_PARSE_LISTPAD(sinkpads)));
if (!srcpads && sinkpads && previous) {
dyn_connect *connect = g_malloc (sizeof (dyn_connect));
connect->srcpadname = srcpadname;
connect->target = GST_PARSE_LISTPAD(sinkpads);
GST_DEBUG(0,"SETTING UP dynamic connection %s:%s and %s:%s\n",
gst_element_get_name (previous),
srcpadname,
GST_DEBUG_PAD_NAME(GST_PARSE_LISTPAD(sinkpads)));
g_signal_connectc (G_OBJECT (previous), "new_pad", dynamic_connect, connect, FALSE);
g_signal_connectc (G_OBJECT (previous), "new_ghost_pad", dynamic_connect, connect, FALSE);
}
else {
for (j=0; (j<numsrcpads) && (j<numsinkpads); j++){
GST_DEBUG(0,"CONNECTING %s:%s and %s:%s\n",
GST_DEBUG_PAD_NAME(GST_PARSE_LISTPAD(g_slist_nth(srcpads,j))),
GST_DEBUG_PAD_NAME(GST_PARSE_LISTPAD(g_slist_nth(sinkpads,j))));
gst_pad_connect(
GST_PARSE_LISTPAD(g_slist_nth(srcpads,j)),
GST_PARSE_LISTPAD(g_slist_nth(sinkpads,j)));
}
}
g_slist_free(srcpads);
srcpads = NULL;
g_slist_free(sinkpads);
sinkpads = NULL;
// thomas: if we're the first element, connect eos signal
if (elementcount == 1)
{
g_signal_connectc (G_OBJECT (element), "eos", have_eos, NULL, FALSE);
}
// if we're the first element, ghost all the sinkpads
if (elementcount == 1) {
DEBUG("first element, ghosting all of %s's sink pads to parent %s\n",
GST_ELEMENT_NAME(element),GST_ELEMENT_NAME(GST_ELEMENT(parent)));
pads = gst_element_get_pad_list (element);
while (pads) {
temppad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!temppad) DEBUG("much oddness, pad doesn't seem to exist\n");
else if (gst_pad_get_direction (temppad) == GST_PAD_SINK) {
gst_element_add_ghost_pad (GST_ELEMENT (parent), temppad,
g_strdup_printf("%s-ghost",GST_PAD_NAME(temppad)));
GST_DEBUG(0,"GHOSTED %s:%s to %s as %s-ghost\n",
GST_DEBUG_PAD_NAME(temppad),GST_ELEMENT_NAME(GST_ELEMENT(parent)),GST_PAD_NAME(temppad));
}
}
}
previous = element;
if (!GST_IS_BIN(element)) prevelement = element;
}
i++;
}
// ghost all the src pads of the bin
if (prevelement != NULL) {
DEBUG("last element, ghosting all of %s's src pads to parent %s\n",
GST_ELEMENT_NAME(prevelement),GST_ELEMENT_NAME(GST_ELEMENT(parent)));
pads = gst_element_get_pad_list (prevelement);
while (pads) {
temppad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!temppad) DEBUG("much oddness, pad doesn't seem to exist\n");
else if (gst_pad_get_direction (temppad) == GST_PAD_SRC) {
gst_element_add_ghost_pad (GST_ELEMENT (parent), temppad,
g_strdup_printf("%s-ghost",GST_PAD_NAME(temppad)));
GST_DEBUG(0,"GHOSTED %s:%s to %s as %s-ghost\n",
GST_DEBUG_PAD_NAME(temppad),GST_ELEMENT_NAME (parent),GST_PAD_NAME(temppad));
}
}
}
priv->binlevel--;
if (retval) return retval;
if (closingchar != '\0')
DEBUG("returning IN THE WRONG PLACE\n");
else DEBUG("ending pipeline\n");
return i+1;
}
/**
* gst_parse_launch:
* @cmdline: the command line describing the pipeline
* @parent: the parent bin for the resulting pipeline
*
* Create a new pipeline based on command line syntax.
*
* Returns: ?
*/
gint
gst_parse_launch(const gchar *cmdline,GstBin *parent)
{
gst_parse_priv priv;
gchar **argvn;
gint newargc;
gint i;
const gchar *cp, *start, *end;
gchar *temp;
GSList *string_list = NULL, *slist;
priv.bincount = 0;
priv.threadcount = 0;
priv.binlevel = 0;
priv.elementcounts = NULL;
priv.verbose = FALSE;
priv.debug = FALSE;
end = cmdline + strlen(cmdline);
newargc = 0;
temp = "";
// Extract the arguments to a gslist in reverse order
for (cp = cmdline; cp < end; ) {
i = strcspn(cp, "([{}]) \"\\");
if (i > 0) {
temp = g_strconcat (temp, g_strndup (cp, i), NULL);
// see if we have an escape char
if (cp[i] != '\\') {
// normal argument - copy and add to the list
string_list = g_slist_prepend(string_list, temp);
newargc++;
temp = "";
}
else {
temp = g_strconcat (temp, g_strndup (&cp[++i], 1), NULL);
}
cp += i;
}
// skip spaces
while (cp < end && *cp == ' ') {
cp++;
}
// handle quoted arguments
if (*cp == '"') {
start = ++cp;
// find matching quote
while (cp < end && *cp != '"')
cp++;
// make sure we got it
if (cp == end) {
g_warning("gst_parse_launch: Unbalanced quote in command line");
// FIXME: The list leaks here
return 0;
}
// copy the string sans quotes
string_list = g_slist_prepend(string_list, g_strndup(start, cp - start));
newargc++;
cp += 2; // skip the quote aswell
}
// brackets exist in a separate argument slot
if (*cp && strchr("([{}])", *cp)) {
string_list = g_slist_prepend(string_list, g_strndup(cp, 1));
newargc++;
cp++;
}
}
// now allocate the new argv array
argvn = g_new0(char *,newargc);
GST_DEBUG(0,"got %d args\n",newargc);
// reverse the list and put the strings in the new array
i = newargc;
for (slist = string_list; slist; slist = slist->next)
argvn[--i] = slist->data;
g_slist_free(string_list);
// print them out
for (i=0;i<newargc;i++) {
GST_DEBUG(0,"arg %d is: %s\n",i,argvn[i]);
}
// set up the elementcounts hash
priv.elementcounts = g_hash_table_new(g_str_hash,g_str_equal);
// do it!
i = gst_parse_launch_cmdline(newargc,argvn,parent,&priv);
// GST_DEBUG(0, "Finished - freeing temporary argument array");
// g_strfreev(argvn);
return i;
}
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