gstreamer/gst/gstinfo.c

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *                    2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
 *
 * gstinfo.c: debugging functions
 *
 * 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.
 */

#include "gst_private.h"

#include "gstinfo.h"

#ifndef GST_DISABLE_GST_DEBUG

#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#include <unistd.h>
#include "gstinfo.h"
#include "gstlog.h"
#include "gst_private.h"
#include "gstelement.h"
#include "gstpad.h"
#include "gstscheduler.h"
#include "gst_private.h"

GST_DEBUG_CATEGORY_STATIC(GST_CAT_DEBUG);

#if 0
#if defined __sgi__
#include <rld_interface.h>
typedef struct DL_INFO {
  const char * dli_fname;
  void       * dli_fbase;
  const char * dli_sname;
  void       * dli_saddr;
  int          dli_version;
  int          dli_reserved1;
  long         dli_reserved[4];
} Dl_info;
#define _RLD_DLADDR             14
int dladdr(void *address, Dl_info *dl);

int dladdr(void *address, Dl_info *dl)
{
  void *v;
  v = _rld_new_interface(_RLD_DLADDR,address,dl);
  return (int)v;
}
#endif /* __sgi__ */
#endif

extern gchar *_gst_progname;

static void	gst_debug_reset_threshold	(gpointer category,
						 gpointer unused);
static void	gst_debug_reset_all_thresholds	(void);

/* list of all name/level pairs from --gst-debug and GST_DEBUG */
static GStaticMutex __level_name_mutex = G_STATIC_MUTEX_INIT;
static GSList *__level_name = NULL;
typedef struct {
  GPatternSpec *	pat;
  GstDebugLevel		level;
} LevelNameEntry;

/* list of all categories */
static GStaticMutex __cat_mutex = G_STATIC_MUTEX_INIT;
static GSList *__categories = NULL;

/* all registered debug handlers */
typedef struct {
  GstLogFunction	func;
  gpointer		user_data;
} LogFuncEntry;
static GStaticMutex __log_func_mutex = G_STATIC_MUTEX_INIT;
static GSList *__log_functions = NULL;

static GstAtomicInt __default_level;
static GstAtomicInt __use_color;
gboolean __gst_debug_enabled = TRUE;


GstDebugCategory *GST_CAT_DEFAULT = NULL;

GstDebugCategory *GST_CAT_GST_INIT = NULL;
GstDebugCategory *GST_CAT_COTHREADS = NULL;
GstDebugCategory *GST_CAT_COTHREAD_SWITCH = NULL;
GstDebugCategory *GST_CAT_AUTOPLUG = NULL;
GstDebugCategory *GST_CAT_AUTOPLUG_ATTEMPT = NULL;
GstDebugCategory *GST_CAT_PARENTAGE = NULL;
GstDebugCategory *GST_CAT_STATES = NULL;
GstDebugCategory *GST_CAT_PLANNING = NULL;
GstDebugCategory *GST_CAT_SCHEDULING = NULL;
GstDebugCategory *GST_CAT_DATAFLOW = NULL;
GstDebugCategory *GST_CAT_BUFFER = NULL;
GstDebugCategory *GST_CAT_CAPS = NULL;
GstDebugCategory *GST_CAT_CLOCK = NULL;
GstDebugCategory *GST_CAT_ELEMENT_PADS = NULL;
GstDebugCategory *GST_CAT_PADS = NULL;
GstDebugCategory *GST_CAT_PIPELINE = NULL;
GstDebugCategory *GST_CAT_PLUGIN_LOADING = NULL;
GstDebugCategory *GST_CAT_PLUGIN_INFO = NULL;
GstDebugCategory *GST_CAT_PROPERTIES = NULL;
GstDebugCategory *GST_CAT_THREAD = NULL;
GstDebugCategory *GST_CAT_TYPES = NULL;
GstDebugCategory *GST_CAT_XML = NULL;
GstDebugCategory *GST_CAT_NEGOTIATION = NULL;
GstDebugCategory *GST_CAT_REFCOUNTING = NULL;
GstDebugCategory *GST_CAT_EVENT = NULL;
GstDebugCategory *GST_CAT_PARAMS = NULL;
GstDebugCategory *GST_CAT_CALL_TRACE = NULL;
GstDebugCategory *GST_CAT_SEEK = NULL;

/**
 * _gst_debug_init:
 * 
 * Initializes the debugging system.
 * Normally you don't want to call this, because gst_init does it for you.
 */
void _gst_debug_init (void)
{
  gst_atomic_int_init (&__default_level, GST_LEVEL_DEFAULT);
  gst_atomic_int_init (&__use_color, 1);

  /* do NOT use a single debug function before this line has been run */
  GST_CAT_DEFAULT	= _gst_debug_category_new ("default", 
				GST_DEBUG_UNDERLINE,
				NULL);
  GST_CAT_DEBUG		= _gst_debug_category_new ("GST_DEBUG",
				GST_DEBUG_BOLD | GST_DEBUG_FG_YELLOW,
				"debugging subsystem");

  gst_debug_add_log_function (gst_debug_log_default, NULL);

  /* FIXME: add descriptions here */
  GST_CAT_GST_INIT	= _gst_debug_category_new ("GST_INIT",
				GST_DEBUG_BOLD | GST_DEBUG_FG_RED,
				NULL);
  GST_CAT_COTHREADS	= _gst_debug_category_new ("GST_COTHREADS",
				GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN,
				NULL);
  GST_CAT_COTHREAD_SWITCH = _gst_debug_category_new ("GST_COTHREAD_SWITCH",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_GREEN,
				NULL);
  GST_CAT_AUTOPLUG	= _gst_debug_category_new ("GST_AUTOPLUG",
				GST_DEBUG_BOLD | GST_DEBUG_FG_BLUE,
				NULL);
  GST_CAT_AUTOPLUG_ATTEMPT = _gst_debug_category_new ("GST_AUTOPLUG_ATTEMPT",
				GST_DEBUG_BOLD | GST_DEBUG_FG_CYAN | GST_DEBUG_BG_BLUE,
				NULL);
  GST_CAT_PARENTAGE	= _gst_debug_category_new ("GST_PARENTAGE",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED,
				NULL);
  GST_CAT_STATES	= _gst_debug_category_new ("GST_STATES",
				GST_DEBUG_BOLD | GST_DEBUG_FG_RED,
				NULL);
  GST_CAT_PLANNING	= _gst_debug_category_new ("GST_PLANNING",
				GST_DEBUG_BOLD | GST_DEBUG_FG_MAGENTA,
				NULL);
  GST_CAT_SCHEDULING	= _gst_debug_category_new ("GST_SCHEDULING",
				GST_DEBUG_BOLD | GST_DEBUG_FG_MAGENTA,
				NULL);
  GST_CAT_DATAFLOW	= _gst_debug_category_new ("GST_DATAFLOW",
				GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN,
				NULL);
  GST_CAT_BUFFER	= _gst_debug_category_new ("GST_BUFFER",
				GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN,
				NULL);
  GST_CAT_CAPS		= _gst_debug_category_new ("GST_CAPS",
				GST_DEBUG_BOLD | GST_DEBUG_FG_BLUE,
				NULL);
  GST_CAT_CLOCK		= _gst_debug_category_new ("GST_CLOCK",
				GST_DEBUG_BOLD | GST_DEBUG_FG_YELLOW,
				NULL);
  GST_CAT_ELEMENT_PADS	= _gst_debug_category_new ("GST_ELEMENT_PADS",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED,
				NULL);
  GST_CAT_PADS		= _gst_debug_category_new ("GST_PADS",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED,
				NULL);
  GST_CAT_PIPELINE	= _gst_debug_category_new ("GST_PIPELINE",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED,
				NULL);
  GST_CAT_PLUGIN_LOADING = _gst_debug_category_new ("GST_PLUGIN_LOADING",
				GST_DEBUG_BOLD | GST_DEBUG_FG_CYAN,
				NULL);
  GST_CAT_PLUGIN_INFO	= _gst_debug_category_new ("GST_PLUGIN_INFO",
				GST_DEBUG_BOLD | GST_DEBUG_FG_CYAN,
				NULL);
  GST_CAT_PROPERTIES	= _gst_debug_category_new ("GST_PROPERTIES",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_BLUE,
				NULL);
  GST_CAT_THREAD	= _gst_debug_category_new ("GST_THREAD",
				GST_DEBUG_BOLD | GST_DEBUG_FG_RED,
				NULL);
  GST_CAT_TYPES		= _gst_debug_category_new ("GST_TYPES",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED,
				NULL);
  GST_CAT_XML		= _gst_debug_category_new ("GST_XML",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED,
				NULL);
  GST_CAT_NEGOTIATION	= _gst_debug_category_new ("GST_NEGOTIATION",
				GST_DEBUG_BOLD | GST_DEBUG_FG_BLUE,
				NULL);
  GST_CAT_REFCOUNTING	= _gst_debug_category_new ("GST_REFCOUNTING",
				GST_DEBUG_BOLD | GST_DEBUG_FG_BLUE | GST_DEBUG_BG_GREEN,
				NULL);
  GST_CAT_EVENT		= _gst_debug_category_new ("GST_EVENT",
				GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED,
				NULL);
  GST_CAT_PARAMS	= _gst_debug_category_new ("GST_PARAMS",
				GST_DEBUG_BOLD | GST_DEBUG_FG_BLACK | GST_DEBUG_BG_YELLOW,
				NULL);
  GST_CAT_CALL_TRACE	= _gst_debug_category_new ("GST_CALL_TRACE",
				GST_DEBUG_BOLD,
				NULL);
  GST_CAT_SEEK          = _gst_debug_category_new ("GST_SEEK",
				0,
				"plugins reacting to seek events");
}

/* we can't do this further above, because we initialize the GST_CAT_DEFAULT struct */
#define GST_CAT_DEFAULT GST_CAT_DEBUG

/**
 * gst_debug_log:
 * @category: category to log
 * @level: level of the message is in
 * @file: the file that emitted the message, usually the __FILE__ identifier
 * @function: the function that emitted the message
 * @line: the line from that the message was emitted, usually __LINE__
 * @object: the object this message relates to or NULL if none
 * @format: a printf style format string
 * @...: optional arguments for the format
 * 
 * Logs the given message using the currently registered debugging handlers.
 */
void gst_debug_log (GstDebugCategory *category, GstDebugLevel level,
		    const gchar *file, const gchar *function, gint line,
		    GObject *object, gchar *format, ...)
{
  va_list var_args;
  
  va_start (var_args, format);
  gst_debug_log_valist (category, level, file, function, line, object, format, var_args);
  va_end (var_args);
}
/**
 * gst_debug_log_valist:
 * @category: category to log
 * @level: level of the message is in
 * @file: the file that emitted the message, usually the __FILE__ identifier
 * @function: the function that emitted the message
 * @line: the line from that the message was emitted, usually __LINE__
 * @object: the object this message relates to or NULL if none
 * @format: a printf style format string
 * @args: optional arguments for the format
 * 
 * Logs the given message using the currently registered debugging handlers.
 */
void gst_debug_log_valist (GstDebugCategory *category, GstDebugLevel level,
			   const gchar *file, const gchar *function, gint line,
			   GObject *object, gchar *format, va_list args)
{
  gchar *message;
  LogFuncEntry *entry;
  GSList *handler;

  g_return_if_fail (category != NULL);
  g_return_if_fail (file != NULL);
  g_return_if_fail (function != NULL);
  g_return_if_fail (format != NULL);

  message = g_strdup_vprintf (format, args);
  handler = __log_functions;
  while (handler) {
    entry = handler->data;
    handler = g_slist_next (handler);
    entry->func (category, level, file, function, line, object, message, entry->user_data);
  }
  g_free (message);
}
/**
 * gst_debug_construct_term_color:
 * @colorinfo: the color info
 * 
 * Constructs a string that can be used for getting the desired color in color
 * terminals.
 * You need to free the string after use.
 * 
 * Returns: a string containing the color definition
 */
gchar *
gst_debug_construct_term_color (guint colorinfo)
{
  GString *color;
  gchar *ret;

  color = g_string_new ("\033[00");

  if (colorinfo & GST_DEBUG_BOLD) {
    g_string_append (color, ";01");
  }
  if (colorinfo & GST_DEBUG_UNDERLINE) {
    g_string_append (color, ";04");
  }
  if (colorinfo & GST_DEBUG_FG_MASK) {
    g_string_append_printf (color, ";3%1d", colorinfo & GST_DEBUG_FG_MASK);
  }
  if (colorinfo & GST_DEBUG_BG_MASK) {
    g_string_append_printf (color, ";4%1d", (colorinfo & GST_DEBUG_BG_MASK) >> 4);
  }
  g_string_append (color, "m");

  ret = color->str;
  g_string_free (color, FALSE);
  return ret;
}
/**
 * gst_debug_log_default:
 * @category: category to log
 * @level: level of the message
 * @file: the file that emitted the message, usually the __FILE__ identifier
 * @function: the function that emitted the message
 * @line: the line from that the message was emitted, usually __LINE__
 * @message: the actual message
 * @object: the object this message relates to or NULL if none
 * @unused: an unused variable, reserved for some user_data.
 * 
 * The default logging handler used by GStreamer. Logging functions get called
 * whenever a macro like GST_DEBUG or similar is used. This function outputs the
 * message and additional info using the glib error handler.
 * You can add other handlers by using #gst_debug_add_log_function. 
 * And you can remove this handler by calling
 * gst_debug_remove_log_function (gst_debug_log_default);
 */
void
gst_debug_log_default (GstDebugCategory *category, GstDebugLevel level,
		       const gchar *file, const gchar *function, gint line,
		       GObject *object, gchar *message, gpointer unused)
{
  gchar *color;
  gchar *clear;
  gchar *obj;
  gchar *pidcolor;
  gint pid;
  
  if (level > gst_debug_category_get_threshold (category))
    return;
  
  pid = getpid();

  /* color info */
  if (gst_debug_is_colored ()) {
    color = gst_debug_construct_term_color (gst_debug_category_get_color (category));
    clear = "\033[00m";
    pidcolor = g_strdup_printf ("\033[3%1dm", pid % 6 + 31);
  } else {
    color = g_strdup ("");
    clear = "";
    pidcolor = g_strdup ("");
  }
  /* nicely printed object */
  if (object == NULL) {
    obj = g_strdup ("");
  } else if (GST_IS_PAD (object) && GST_OBJECT_NAME (object)) {
    obj = g_strdup_printf (" [%s:%s]", GST_DEBUG_PAD_NAME (object));
  } else if (GST_IS_OBJECT (object) && GST_OBJECT_NAME (object)) {
    obj = g_strdup_printf (" [%s]", GST_OBJECT_NAME (object));
  } else {
    obj = g_strdup_printf (" [%s@%p]", G_OBJECT_TYPE_NAME(object), object);  
  }

  g_printerr ("%s %s%15s%s(%s%5d%s) %s%s(%d):%s:%s%s %s\n", 
  	      gst_debug_level_get_name (level),
              color, gst_debug_category_get_name (category), clear,
              pidcolor, pid, clear,
  	      color, file, line, function, obj, clear,
  	      message);

  g_free (color);
  g_free (pidcolor);
  g_free (obj);
}
/**
 * gst_debug_level_get_name:
 * @level: the level to get the name for
 * 
 * Get the string trepresentation of a debugging level
 * 
 * Returns: the name
 */
const gchar *
gst_debug_level_get_name (GstDebugLevel level)
{
  switch (level) {
    case GST_LEVEL_NONE:	return "";
    case GST_LEVEL_ERROR:	return "ERROR";
    case GST_LEVEL_WARNING:	return "WARN ";
    case GST_LEVEL_INFO:	return "INFO ";
    case GST_LEVEL_DEBUG:	return "DEBUG";
    case GST_LEVEL_LOG:		return "LOG  ";
    default:
      g_warning ("invalid level specified for gst_debug_level_get_name");
      return "";
  }
}
/**
 * gst_debug_add_log_function:
 * @func: the function to use
 * @data: user data
 * 
 * Adds the logging function to the list of logging functions.
 * Be sure to use G_GNUC_NO_INSTRUMENT on that function, it is needed.
 */
void
gst_debug_add_log_function (GstLogFunction func, gpointer data)
{
  LogFuncEntry *entry;
  GSList *list;

  g_return_if_fail (func != NULL);

  entry = g_new (LogFuncEntry, 1);
  entry->func = func;
  entry->user_data = data;
  /* FIXME: we leak the old list here - other threads might access it right now
   * in gst_debug_logv. Another solution is to lock the mutex in gst_debug_logv,
   * but that is waaay costly.
   * It'd probably be clever to use some kind of RCU here, but I don't know 
   * anything about that.
   */
  g_static_mutex_lock (&__log_func_mutex);
  list = g_slist_copy (__log_functions);
  __log_functions = g_slist_prepend (list, entry);
  g_static_mutex_unlock (&__log_func_mutex);

  GST_DEBUG ("prepended log function %p (user data %p) to log functions",
             func, data);
}
static gint
gst_debug_compare_log_function_by_func (gconstpointer entry, gconstpointer func)
{
  gpointer entryfunc = ((LogFuncEntry *) entry)->func;
  
  return (entryfunc < func) ? -1 : (entryfunc > func) ? 1 : 0;
}
static gint
gst_debug_compare_log_function_by_data (gconstpointer entry, gconstpointer data)
{
  gpointer entrydata = ((LogFuncEntry *) entry)->user_data;
  
  return (entrydata < data) ? -1 : (entrydata > data) ? 1 : 0;
}
static guint
gst_debug_remove_with_compare_func (GCompareFunc func, gpointer data)
{
  GSList *found;
  GSList *new;
  guint removals = 0;
  g_static_mutex_lock (&__log_func_mutex);
  new = __log_functions;
  while ((found = g_slist_find_custom (new, data, func))) {
    if (new == __log_functions) {
      new = g_slist_copy (new);
      continue;
    }
    g_free (found->data);
    new = g_slist_delete_link (new, found);
    removals++;
  }
  /* FIXME: We leak the old list here. See _add_log_function for why. */
  __log_functions = new;
  g_static_mutex_unlock (&__log_func_mutex);

  return removals;
}
/**
 * gst_debug_remove_log_function:
 * @func: the log function to remove
 * 
 * Removes all registrered instances of the given logging functions.
 * 
 * Returns: How many instances of the function were removed
 */
guint
gst_debug_remove_log_function (GstLogFunction func)
{
  guint removals;
  
  g_return_val_if_fail (func != NULL, 0);

  removals = gst_debug_remove_with_compare_func (gst_debug_compare_log_function_by_func, func);
  GST_DEBUG ("removed log function %p %d times from log function list",
             func, removals);

  return removals;
}
/**
 * gst_debug_remove_log_function_by_data:
 * @data: user data of the log function to remove
 * 
 * Removes all registrered instances of log functions with the given user data.
 * 
 * Returns: How many instances of the function were removed
 */
guint
gst_debug_remove_log_function_by_data (gpointer data)
{
  guint removals;

  removals = gst_debug_remove_with_compare_func (gst_debug_compare_log_function_by_data, data);
  GST_DEBUG ("removed %d log functions with user data %p from log function list",
             removals, data);

  return removals;
}
/**
 * gst_debug_set_colored:
 * @colored: Whether to use colored output or not
 * 
 * Sets or unsets the use of coloured debugging output.
 */
void
gst_debug_set_colored (gboolean colored)
{
  gst_atomic_int_set (&__use_color, colored ? 1 : 0);
}
/**
 * gst_debug_is_colored:
 * 
 * Checks if the debugging output should be colored.
 * 
 * Returns: TRUE, if the debug output should be colored.
 */
gboolean
gst_debug_is_colored (void)
{
  return gst_atomic_int_read (&__use_color) == 0 ? FALSE : TRUE;
}
/**
 * gst_debug_set_active:
 * @active: Whether to use debugging output or not
 * 
 * If activated, debugging messages are sent to the debugging
 * handlers.
 * It makes sense to deactivate it for speed issues.
 * <note><para>This function is not threadsafe. It makes sense to only call it
 * during initialization.</para></note>
 */
void
gst_debug_set_active (gboolean active)
{
  __gst_debug_enabled = active;
}
/**
 * gst_debug_is_active:
 * 
 * Checks if debugging output is activated.
 * 
 * Returns: TRUE, if debugging is activated
 */
gboolean
gst_debug_is_active (void)
{
  return __gst_debug_enabled;
}
/**
 * gst_debug_set_default_threshold:
 * @level: level to set
 * 
 * Sets the default threshold to the given level and updates all categories to
 * use this threshold.
 */
void
gst_debug_set_default_threshold (GstDebugLevel level)
{
  gst_atomic_int_set (&__default_level, level);
  gst_debug_reset_all_thresholds ();
}
/**
 * gst_debug_get_default_threshold:
 * 
 * Returns the default threshold that is used for new categories.
 * 
 * Returns: the default threshold level
 */
GstDebugLevel
gst_debug_get_default_threshold (void)
{	
  return (GstDebugLevel) gst_atomic_int_read (&__default_level);
}
static void
gst_debug_reset_threshold (gpointer category, gpointer unused)
{
  GstDebugCategory *cat = (GstDebugCategory *) category;
  GSList *walk;
  
  g_static_mutex_lock (&__level_name_mutex);
  walk = __level_name;
  while (walk) {
    LevelNameEntry *entry = walk->data;
    walk = g_slist_next (walk);
    if (g_pattern_match_string (entry->pat, cat->name)) {
      GST_LOG ("category %s matches pattern %p - gets set to level %d",
               cat->name, entry->pat, entry->level);
      gst_debug_category_set_threshold (cat, entry->level);
      goto exit;
    }
  }
  gst_debug_category_set_threshold (cat, gst_debug_get_default_threshold ());

exit:
  g_static_mutex_unlock (&__level_name_mutex);
}
static void
gst_debug_reset_all_thresholds (void)
{
  g_static_mutex_lock (&__cat_mutex);
  g_slist_foreach (__categories, gst_debug_reset_threshold, NULL);
  g_static_mutex_unlock (&__cat_mutex);
}
static void
for_each_threshold_by_entry (gpointer data, gpointer user_data)
{
  GstDebugCategory *cat = (GstDebugCategory *) data;
  LevelNameEntry *entry = (LevelNameEntry *) user_data;

  if (g_pattern_match_string (entry->pat, cat->name)) {
    GST_LOG ("category %s matches pattern %p - gets set to level %d",
             cat->name, entry->pat, entry->level);
    gst_debug_category_set_threshold (cat, entry->level);
  }
}
/**
 * gst_debug_set_threshold_for_name:
 * @name: name of the categories to set
 * @level: level to set them to
 * 
 * Sets all categories which match the gven glob style pattern to the given 
 * level.
 */
void
gst_debug_set_threshold_for_name (const gchar *name, GstDebugLevel level)
{
  GPatternSpec *pat;
  LevelNameEntry *entry;
	
  g_return_if_fail (name != NULL);

  pat = g_pattern_spec_new (name);
  entry = g_new (LevelNameEntry, 1);
  entry->pat = pat;
  entry->level = level;
  g_static_mutex_lock (&__level_name_mutex);
  __level_name = g_slist_prepend (__level_name, entry);
  g_static_mutex_unlock (&__level_name_mutex);
  g_static_mutex_lock (&__cat_mutex);
  g_slist_foreach (__categories, for_each_threshold_by_entry, entry);
  g_static_mutex_unlock (&__cat_mutex);
}
/**
 * gst_debug_unset_threshold_for_name:
 * @name: name of the categories to set
 * 
 * Resets all categories with the given name back to the default level.
 */
void
gst_debug_unset_threshold_for_name (const gchar *name)
{
  GSList *walk;
  GPatternSpec *pat;
	
  g_return_if_fail (name != NULL);

  pat = g_pattern_spec_new (name);
  g_static_mutex_lock (&__level_name_mutex);
  walk = __level_name;
  /* improve this if you want, it's mighty slow */
  while (walk) {
    LevelNameEntry *entry = walk->data;
    if (g_pattern_spec_equal (entry->pat, pat)) {
      __level_name = g_slist_remove_link (__level_name, walk);
      g_pattern_spec_free (entry->pat);
      g_free (entry);
      g_slist_free_1 (walk);
      walk = __level_name;
    }
  }
  g_static_mutex_unlock (&__level_name_mutex);
  g_pattern_spec_free (pat);
  gst_debug_reset_all_thresholds ();
}
GstDebugCategory *
_gst_debug_category_new	(gchar *name, guint color, gchar *description)
{
  GstDebugCategory *cat;
  
  g_return_val_if_fail (name != NULL, NULL);

  cat = g_new (GstDebugCategory, 1);
  cat->name = g_strdup (name);
  cat->color = color;
  if (description != NULL) {
    cat->description = g_strdup (description);
  } else {
    cat->description = g_strdup ("no description");
  }
  cat->threshold = g_new (GstAtomicInt, 1);
  gst_atomic_int_init (cat->threshold, 0);
  gst_debug_reset_threshold (cat, NULL);

  /* add to category list */
  g_static_mutex_lock (&__cat_mutex);
  __categories = g_slist_prepend (__categories, cat);
  g_static_mutex_unlock (&__cat_mutex);

  return cat;
}
/**
 * gst_debug_category_free:
 * @category: category to remove
 * 
 * Removes and frees the category and all associated ressources.
 */
void
gst_debug_category_free (GstDebugCategory *category)
{
  if (category == NULL) return;

  /* remove from category list */
  g_static_mutex_lock (&__cat_mutex);
  __categories = g_slist_remove (__categories, category);
  g_static_mutex_unlock (&__cat_mutex);

  g_free ((gpointer) category->name); 
  g_free ((gpointer) category->description); 
  gst_atomic_int_destroy (category->threshold);
  g_free (category->threshold);
  g_free (category);
}
/**
 * gst_debug_category_set_threshold:
 * @category: category to set threshold for
 * @level: the threshold to set
 * 
 * Sets the threshold of the category to the given level. Debug information will
 * only be output if the threshold is lower or equal to the level of the 
 * debugging message.
 * <note><para>
 * Do not use this function in production code, because other functions may 
 * change the threshold of categories as side effect. It is however a nice 
 * function to use when debugging (even from gdb).
 * </para></note>
 */
void
gst_debug_category_set_threshold (GstDebugCategory *category, GstDebugLevel level)
{
  g_return_if_fail (category != NULL);

  gst_atomic_int_set (category->threshold, level);
}
/**
 * gst_debug_category_reset_threshold:
 * @category: category to set threshold for
 * 
 * Resets the threshold of the category to the default level. Debug information 
 * will only be output if the threshold is lower or equal to the level of the 
 * debugging message.
 * Use this function to set the threshold back to where it was after using 
 * gst_debug_category_set_threshold().
 */
void
gst_debug_category_reset_threshold (GstDebugCategory *category)
{
  gst_debug_reset_threshold (category, NULL);
}
/**
 * gst_debug_category_get_threshold:
 * @category: category to get threshold for
 * 
 * Returns the threshold of a #GstCategory.
 * 
 * Returns: the level that is used as threshold
 */
GstDebugLevel
gst_debug_category_get_threshold (GstDebugCategory *category)
{
  return gst_atomic_int_read (category->threshold);
}
/**
 * gst_debug_category_get_name:
 * @category: category to get name for
 * 
 * Returns the name of a #GstCategory.
 * 
 * Returns: the name of the category
 */
const gchar *
gst_debug_category_get_name (GstDebugCategory *category)
{
  return category->name;
}
/**
 * gst_debug_category_get_color:
 * @category: category to get color for
 * 
 * Returns the color of a #GstCategory to use when outputting this.
 * 
 * Returns: the color of the category
 */
guint
gst_debug_category_get_color (GstDebugCategory *category)
{
  return category->color;
}
/**
 * gst_debug_category_get_description:
 * @category: category to get description for
 * 
 * Returns the description of a #GstCategory
 * 
 * Returns: the description of the category
 */
const gchar *
gst_debug_category_get_description (GstDebugCategory *category)
{
  return category->description;
}
/**
 * gst_debug_get_all_categories:
 *
 * Returns a snapshot of a all categories that are currently in use . This list
 * may change anytime.
 * The caller has to free the list after use.
 * <emphasis>This function is not threadsafe, so only use it while only the 
 * main thread is running.</emphasis>
 * 
 * Returns: the list of categories
 */
GSList *
gst_debug_get_all_categories (void)
{
  GSList *ret;

  g_static_mutex_lock (&__cat_mutex);
  ret = g_slist_copy (__categories);
  g_static_mutex_unlock (&__cat_mutex);

  return ret; 
}

/*** FUNCTION POINTERS ********************************************************/

GHashTable *__gst_function_pointers = NULL;
const gchar *_gst_debug_nameof_funcptr (void *ptr) G_GNUC_NO_INSTRUMENT;

/* This function MUST NOT return NULL */
const gchar *
_gst_debug_nameof_funcptr (void *ptr)
{
  gchar *ptrname;
#ifdef HAVE_DLADDR
  Dl_info dlinfo;
#endif

  if (__gst_function_pointers && (ptrname = g_hash_table_lookup(__gst_function_pointers,ptr))) {
    return ptrname;
  }
  /* we need to create an entry in the hash table for this one so we don't leak
   * the name */
#ifdef HAVE_DLADDR
  if (dladdr(ptr,&dlinfo) && dlinfo.dli_sname) {
    gchar *name = g_strdup (dlinfo.dli_sname);
    _gst_debug_register_funcptr (ptr, name);
    return name;
  } else
#endif
  {
    gchar *name = g_strdup_printf ("%p", ptr);
    _gst_debug_register_funcptr (ptr, name);
    return name;
  }
}

void *
_gst_debug_register_funcptr (void *ptr, gchar *ptrname)
{
  if (!__gst_function_pointers)
    __gst_function_pointers = g_hash_table_new (g_direct_hash, g_direct_equal);
  if (!g_hash_table_lookup (__gst_function_pointers, ptr))
    g_hash_table_insert (__gst_function_pointers, ptr, ptrname);

  return ptr;
}

#endif /* GST_DISABLE_GST_DEBUG */

#ifdef GST_ENABLE_FUNC_INSTRUMENTATION
/* FIXME make this thread specific */
static GSList *stack_trace = NULL;

void __cyg_profile_func_enter(void *this_fn,void *call_site) G_GNUC_NO_INSTRUMENT;
void __cyg_profile_func_enter(void *this_fn,void *call_site) 
{
  gchar *name = _gst_debug_nameof_funcptr (this_fn);
  gchar *site = _gst_debug_nameof_funcptr (call_site);
	
  GST_CAT_DEBUG(GST_CAT_CALL_TRACE, "entering function %s from %s", name, site);
  stack_trace = g_slist_prepend (stack_trace, g_strdup_printf ("%8p in %s from %p (%s)", this_fn, name, call_site, site));

  g_free (name);
  g_free (site);
}

void __cyg_profile_func_exit(void *this_fn,void *call_site) G_GNUC_NO_INSTRUMENT;
void __cyg_profile_func_exit(void *this_fn,void *call_site) 
{
  gchar *name = _gst_debug_nameof_funcptr (this_fn);

  GST_CAT_DEBUG(GST_CAT_CALL_TRACE, "leaving function %s", name);
  g_free (stack_trace->data);
  stack_trace = g_slist_delete_link (stack_trace, stack_trace);

  g_free (name);
}

void 
gst_debug_print_stack_trace (void)
{
  GSList *walk = stack_trace;
  gint count = 0;

  if (walk)
    walk = g_slist_next (walk);

  while (walk) {
    gchar *name = (gchar *) walk->data;

    g_print ("#%-2d %s\n", count++, name);

    walk = g_slist_next (walk);
  }
}
#else
void 
gst_debug_print_stack_trace (void)
{
  /* nothing because it's compiled out */
}

#endif /* GST_ENABLE_FUNC_INTSTRUMENTATION */