gstreamer/gst/gstparse.c

/* 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)
{
  gpointer tmp;
  gint count;

  tmp = g_hash_table_lookup (priv->elementcounts,type);
  count = GPOINTER_TO_INT (tmp);
  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");
        return GST_PARSE_ERROR_SYNTAX;
      }
      i++;
      if (i < argc) {
        gst_element_set_name(previous, argv[i]);
      } else {
        fprintf(stderr,"error, expected element name, found end of arguments\n");
        return GST_PARSE_ERROR_SYNTAX;
      }
      i++;
      if (i >= argc) {
        fprintf(stderr,"error, expected ], found end of arguments\n");
        return GST_PARSE_ERROR_SYNTAX;
      } else if (strcmp(argv[i], "]") != 0) {
        fprintf(stderr,"error, expected ], found '%s'\n", argv[i]);
        return GST_PARSE_ERROR_SYNTAX;
      }
    } 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");
            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 {
	  DEBUG("error in parser, unexpected symbol, FIXME\n");
	  i++;
	  continue;
	}

        j = gst_parse_launch_cmdline(argc - i, argv + i + 1, GST_BIN (element), priv);
        //check for parse error
        if (j < 0) return j;
        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 gstreamer-register?\n",arg);
#else
          fprintf(stderr,"Couldn't create a '%s', no such element or need to load pluginn?\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) {
        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_connect (G_OBJECT (previous), "new_pad",
			  G_CALLBACK (dynamic_connect), connect);
        g_signal_connect (G_OBJECT (previous), "new_ghost_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))));
          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_connect (G_OBJECT (element), "eos", have_eos, NULL);

      }
      // 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;

  DEBUG (closingchar != '\0'?
	 "returning IN THE WRONG PLACE\n" : 
	 "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;
}