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gstreamer/gst/gstparse.c
Andy Wingo a7c3fc7d6c cleaning up duplicated code in gstbin.c added some sanity checks in gstpad.c added checks for failed connections in g... 
Original commit message from CVS:
* cleaning up duplicated code in gstbin.c
* added some sanity checks in gstpad.c
* added checks for failed connections in gstparse.c
* better docs in gstxml.c
2002-01-18 22:44:19 +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...) g_print (format, ##args) */
#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;
};
typedef struct
{
gchar *srcpadname;
GstPad *target;
GstElement *pipeline;
}
dyn_connect;
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_element_set_state (connect->pipeline, GST_STATE_PAUSED);
if (!gst_pad_connect (newpad, connect->target))
g_warning ("could not connect %s:%s to %s:%s", GST_DEBUG_PAD_NAME (newpad),
GST_DEBUG_PAD_NAME (connect->target));
gst_element_set_state (connect->pipeline, GST_STATE_PLAYING);
}
}
static gchar *
gst_parse_unique_name (const gchar * type, gst_parse_priv * priv)
{
gpointer tmp;
gint count;
tmp = g_hash_table_lookup (priv->elementcounts, type);
count = GPOINTER_TO_INT (tmp);
count++;
g_hash_table_insert (priv->elementcounts, g_strdup (type), GINT_TO_POINTER (count));
return g_strdup_printf ("%s%d", type, count - 1);
}
static gint
gst_parse_launchv_recurse (const gchar **argv, GstBin * parent, gst_parse_priv * priv)
{
gint i = -1, j = 0;
const gchar *arg;
GstElement *element = NULL, *previous = NULL, *prevelement = NULL;
gchar closingchar = '\0';
gint len;
const gchar *cptr;
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;
gboolean backref = FALSE;
if (!priv) {
priv = g_new0 (gst_parse_priv, 1);
priv->elementcounts = g_hash_table_new (g_str_hash, g_str_equal);
}
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 ((arg = argv[++i])) {
len = strlen (arg);
element = NULL;
DEBUG ("** ARGUMENT is '%s'\n", arg);
if (len == 0) {
DEBUG ("random arg, FIXME\n");
continue;
} else if (arg[0] == closingchar) {
DEBUG ("exiting container %s\n", GST_ELEMENT_NAME (GST_ELEMENT (parent)));
retval = i + 1;
break;
} else if ((cptr = 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 = g_strdup (&arg[1]);
else
sinkpadname = NULL;
} else {
srcpadname = g_strndup (arg, (cptr - arg));
/* if there's a sinkpad */
if (len > (cptr - arg) + 1)
sinkpadname = g_strdup(&cptr[1]);
else
sinkpadname = NULL;
}
if (srcpadname && (ptr = strchr (srcpadname, '.'))) {
gchar *element_name = srcpadname;
GstElement *new;
*ptr = '\0'; /* it was a '.' before */
GST_DEBUG (0, "have pad for element %s\n", element_name);
new = gst_bin_get_by_name_recurse_up (parent, element_name);
if (!new) {
GST_DEBUG (0, "element %s does not exist! trying to continue\n", element_name);
} else {
previous = new;
srcpadname = ptr + 1;
backref = TRUE;
}
}
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 = srcpadname;
srcpadname = &ptr[1];
*ptr = '\0';
} 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 src pad */
GST_DEBUG (0, "CHECKING 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)));
}
} else if (strchr (arg, '=')) {
gchar *propname;
gchar *propval;
gchar *pos;
DEBUG ("have a property\n");
/* we have a property */
propname = g_strdup (arg);
pos = strchr (propname, '=');
*pos = '\0';
propval = pos + 1;
/* use g_object_set in the future when gst_util_{set|get} go away */
GST_DEBUG (0, "attempting to set property '%s' to '%s' on element '%s'\n",
propname, propval, GST_ELEMENT_NAME (previous));
gst_util_set_object_arg (G_OBJECT (previous), propname, propval);
g_free (propname);
} else if (arg[0] == '[') {
DEBUG ("have element name\n");
if (arg[1] != '\0') {
fprintf (stderr, "error, unexpected junk after [\n");
return GST_PARSE_ERROR_SYNTAX;
}
if ((arg = argv[++i])) {
if (!previous) {
g_critical("parser error, please report");
return GST_PARSE_ERROR_INTERNAL;
}
gst_element_set_name (previous, arg);
} else {
fprintf (stderr, "error, expected element name, found end of arguments\n");
return GST_PARSE_ERROR_SYNTAX;
}
if ((arg = argv[++i])) {
if (strcmp (arg, "]") != 0) {
fprintf (stderr, "error, expected ], found '%s'\n", arg);
return GST_PARSE_ERROR_SYNTAX;
}
} else {
fprintf (stderr, "error, expected ], found end of arguments\n");
return GST_PARSE_ERROR_SYNTAX;
}
} else {
/* we have an element, a bin, or a thread. we treat these together because
* once we rech them we have to resolve any dangling connections from
* previous array arguments. */
if (strchr ("({", arg[0])) {
DEBUG ("have bin or thread\n");
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");
return GST_PARSE_ERROR_CREATING_ELEMENT;
}
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");
return GST_PARSE_ERROR_CREATING_ELEMENT;
}
GST_DEBUG (0, "CREATED thread %s\n", GST_ELEMENT_NAME (element));
} else {
fprintf (stderr, "Illegal argument: %s\n", arg);
return GST_PARSE_ERROR_CREATING_ELEMENT;
}
gst_bin_add (GST_BIN (parent), element);
j = gst_parse_launchv_recurse (argv + i + 1, GST_BIN (element), priv);
/* check for parse error */
if (j < 0)
return j;
/* we will get autoincremented at the while */
i += j;
} 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) {
#ifndef GST_DISABLE_REGISTRY
fprintf (stderr,
"Couldn't create a '%s', no such element or need to run gst-register?\n", arg);
#else
fprintf (stderr, "Couldn't create a '%s', no such element or need to load plugin?\n",
arg);
#endif
return GST_PARSE_ERROR_NOSUCH_ELEMENT;
}
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 element\n");
else
GST_DEBUG (0, "have sink pad %s:%s\n", GST_DEBUG_PAD_NAME (GST_PARSE_LISTPAD (sinkpads)));
if (!srcpads && sinkpads && previous && srcpadname) {
dyn_connect *connect = g_malloc (sizeof (dyn_connect));
connect->srcpadname = srcpadname;
connect->target = GST_PARSE_LISTPAD (sinkpads);
connect->pipeline = GST_ELEMENT (parent);
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_connect (G_OBJECT (previous), "new_pad", G_CALLBACK (dynamic_connect), connect);
} 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))));
if (!gst_pad_connect (GST_PARSE_LISTPAD (g_slist_nth (srcpads, j)),
GST_PARSE_LISTPAD (g_slist_nth (sinkpads, j)))) {
g_warning ("could not connect %s:%s to %s:%s",
GST_DEBUG_PAD_NAME (GST_PARSE_LISTPAD (g_slist_nth (srcpads, j))),
GST_DEBUG_PAD_NAME (GST_PARSE_LISTPAD (g_slist_nth (sinkpads, j))));
return GST_PARSE_ERROR_CONNECT;
}
}
}
g_slist_free (srcpads);
srcpads = NULL;
g_slist_free (sinkpads);
sinkpads = NULL;
/* if we're the first element, ghost all the sinkpads */
if (elementcount == 1 && !backref) {
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;
}
}
/* 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;
DEBUG (closingchar != '\0' ? "returning IN THE WRONG PLACE\n" : "ending pipeline\n");
return i + 1;
}
/**
* gst_parse_launchv:
* @argv: null-terminated array of arguments
*
* Create a new pipeline based on command line syntax.
*
* Returns: a new pipeline on success, NULL on failure
*/
GstPipeline *
gst_parse_launchv (const gchar **argv)
{
GstPipeline *pipeline;
gint ret;
/* defer error detection to the _recurse function */
pipeline = (GstPipeline*) gst_pipeline_new ("launch");
ret = gst_parse_launchv_recurse (argv, GST_BIN (pipeline), NULL);
if (ret <= 0) {
// print an error
gst_object_unref (GST_OBJECT (pipeline));
return NULL;
} else {
return pipeline;
}
}
/**
* gst_parse_launch:
* @pipeline_description: the command line describing the pipeline
*
* Create a new pipeline based on command line syntax.
*
* Returns: a new GstPipeline (cast to a Bin) on success, NULL on failure
*/
GstPipeline *
gst_parse_launch (const gchar * pipeline_description)
{
gchar **argvn;
gint newargc;
gint i;
const gchar *cp, *start, *end;
gchar *temp;
GSList *string_list = NULL, *slist;
GstPipeline *pipeline;
end = pipeline_description + strlen (pipeline_description);
newargc = 0;
temp = "";
/* Extract the arguments to a gslist in reverse order */
for (cp = pipeline_description; 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, with room for NULL termination */
argvn = g_new0 (char *, newargc + 1);
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 */
while (argvn[i]) {
GST_DEBUG (0, "arg %d is: %s\n", i, argvn[i++]);
}
/* do it! */
pipeline = gst_parse_launchv (argvn);
GST_DEBUG(0, "Finished - freeing temporary argument array");
g_strfreev(argvn);
return pipeline;
}
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