Fix a memleak in gst_cmml_track_list_add_clip.

Original commit message from CVS:
2006-02-25  Alessandro Decina <alessandro@nnva.org>

* ext/annodex/Makefile.am:
* ext/annodex/gstannodex.c:
* ext/annodex/gstcmmldec.c:
* ext/annodex/gstcmmlenc.c:
* ext/annodex/gstcmmlparser.c:
* ext/annodex/gstcmmlparser.h:
* ext/annodex/gstcmmlutils.c:
* tests/check/elements/cmmldec.c:
* tests/check/elements/cmmlenc.c:
Fix a memleak in gst_cmml_track_list_add_clip.
Handle overflows in clip's start and end times.
Add the "encoded" parameter to cmmldec and cmmlenc caps.
Do not parse junk at the end of a CMML preamble buffer.
Register a libxml error handler to not print stuff on stderr.
Check for bad clip start and end times in the testsuites.

7 files changed, 123 insertions, 84 deletions

diff --git a/ext/annodex/Makefile.am b/ext/annodex/Makefile.am
index b315522d..8c47683d 100644
--- a/ext/annodex/Makefile.am
+++ b/ext/annodex/Makefile.am
@@ -12,8 +12,7 @@ libgstannodex_la_SOURCES = \
 	gstcmmldec.c \
 	gstcmmlenc.c \
 	gstcmmltag.c \
-	gstcmmlparser.c \
-	gstskeltag.c
+	gstcmmlparser.c
 
 # flags used to compile this plugin
 # we use the GST_LIBS flags because we might be using plug-in libs
diff --git a/ext/annodex/gstannodex.c b/ext/annodex/gstannodex.c
index a489a735..fa935f25 100644
--- a/ext/annodex/gstannodex.c
+++ b/ext/annodex/gstannodex.c
@@ -25,7 +25,9 @@
 #include "config.h"
 #endif
 
+#include <math.h>
 #include <gst/tag/tag.h>
+#include "gstcmmlparser.h"
 #include "gstcmmlenc.h"
 #include "gstcmmldec.h"
 
@@ -49,9 +51,9 @@ gst_annodex_granule_to_time (gint64 granulepos, gint64 granulerate_n,
     granulepos = keyindex + keyoffset;
   }
 
-  /* GST_SECOND / granulerate_n / granulerate_d */
+  /* GST_SECOND / (granulerate_n / granulerate_d) */
   granulerate = gst_util_uint64_scale (GST_SECOND,
-      granulerate_n, granulerate_d);
+      granulerate_d, granulerate_n);
 
   /* granulepos * granulerate */
   res = gst_util_uint64_scale (granulepos, granulerate, 1);
@@ -135,7 +137,6 @@ fail:
 static gboolean
 plugin_init (GstPlugin * plugin)
 {
-
   gst_tag_register (GST_TAG_CMML_STREAM, GST_TAG_FLAG_META,
       GST_TYPE_CMML_TAG_STREAM, "cmml-stream", "annodex CMML stream tag", NULL);
 
@@ -145,6 +146,8 @@ plugin_init (GstPlugin * plugin)
   gst_tag_register (GST_TAG_CMML_CLIP, GST_TAG_FLAG_META,
       GST_TYPE_CMML_TAG_CLIP, "cmml-clip", "annodex CMML clip tag", NULL);
 
+  gst_cmml_parser_init ();
+
   if (!gst_cmml_enc_plugin_init (plugin))
     return FALSE;
 
diff --git a/ext/annodex/gstcmmldec.c b/ext/annodex/gstcmmldec.c
index 54ea2134..a2bb67b3 100644
--- a/ext/annodex/gstcmmldec.c
+++ b/ext/annodex/gstcmmldec.c
@@ -79,14 +79,14 @@ static GstStaticPadTemplate gst_cmml_dec_src_factory =
 GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
-    GST_STATIC_CAPS ("text/xml")
+    GST_STATIC_CAPS ("text/x-cmml, encoded = (boolean) false")
     );
 
 static GstStaticPadTemplate gst_cmml_dec_sink_factory =
 GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
-    GST_STATIC_CAPS ("text/x-cmml")
+    GST_STATIC_CAPS ("text/x-cmml, encoded = (boolean) true")
     );
 
 /* GstCmmlDec */
@@ -449,6 +449,9 @@ gst_cmml_dec_new_buffer (GstCmmlDec * dec,
     if (data)
       memcpy (GST_BUFFER_DATA (*buffer), data, size);
     GST_BUFFER_TIMESTAMP (*buffer) = dec->timestamp;
+  } else {
+    GST_WARNING_OBJECT (dec, "alloc function returned error %s",
+        gst_flow_get_name (res));
   }
 
   return res;
@@ -505,8 +508,11 @@ gst_cmml_dec_parse_first_header (GstCmmlDec * dec, GstBuffer * buffer)
    * will be triggered. Otherwise we need to call it manually.
    */
   if (!GST_FLOW_IS_FATAL (dec->flow_return) && !dec->sent_root) {
-    gst_cmml_dec_parse_preamble (dec, GST_BUFFER_DATA (buffer),
-        (guchar *) "<cmml>");
+    guchar *preamble = (guchar *) g_strndup ((gchar *) GST_BUFFER_DATA (buffer),
+        GST_BUFFER_SIZE (buffer));
+
+    gst_cmml_dec_parse_preamble (dec, preamble, (guchar *) "<cmml>");
+    g_free (preamble);
   }
 }
 
@@ -536,6 +542,7 @@ gst_cmml_dec_parse_preamble (GstCmmlDec * dec, guchar * preamble,
 
   /* send the root element to the internal parser */
   gst_cmml_dec_parse_xml (dec, root_element, strlen ((gchar *) root_element));
+  dec->sent_root = TRUE;
 
   /* push the root element */
   dec->flow_return = gst_cmml_dec_new_buffer (dec,
@@ -546,7 +553,6 @@ gst_cmml_dec_parse_preamble (GstCmmlDec * dec, guchar * preamble,
   dec->flow_return = gst_pad_push (dec->srcpad, buffer);
   if (!GST_FLOW_IS_FATAL (dec->flow_return)) {
     GST_INFO_OBJECT (dec, "preamble parsed");
-    dec->sent_root = TRUE;
   }
 
 done:
diff --git a/ext/annodex/gstcmmlenc.c b/ext/annodex/gstcmmlenc.c
index 9600a96b..e9195c34 100644
--- a/ext/annodex/gstcmmlenc.c
+++ b/ext/annodex/gstcmmlenc.c
@@ -75,14 +75,14 @@ static GstStaticPadTemplate gst_cmml_enc_src_factory =
 GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
-    GST_STATIC_CAPS ("text/x-cmml")
+    GST_STATIC_CAPS ("text/x-cmml, encoded = (boolean) true")
     );
 
 static GstStaticPadTemplate gst_cmml_enc_sink_factory =
 GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
-    GST_STATIC_CAPS ("text/xml")
+    GST_STATIC_CAPS ("text/x-cmml, encoded = (boolean) false")
     );
 
 GST_BOILERPLATE (GstCmmlEnc, gst_cmml_enc, GstElement, GST_TYPE_ELEMENT);
@@ -103,9 +103,6 @@ static void gst_cmml_enc_parse_tag_clip (GstCmmlEnc * enc,
     GstCmmlTagClip * tag);
 static GstFlowReturn gst_cmml_enc_new_buffer (GstCmmlEnc * enc,
     guchar * data, gint size, GstBuffer ** buffer);
-#if 0
-static void gst_cmml_enc_flush_clips (GstCmmlEnc * enc);
-#endif
 static GstFlowReturn gst_cmml_enc_push_clip (GstCmmlEnc * enc,
     GstCmmlTagClip * clip, GstClockTime prev_clip_time);
 static GstFlowReturn gst_cmml_enc_push (GstCmmlEnc * enc, GstBuffer * buffer);
@@ -137,13 +134,13 @@ gst_cmml_enc_class_init (GstCmmlEncClass * enc_class)
       g_param_spec_int64 ("granule-rate-numerator",
           "Granulerate numerator",
           "Granulerate numerator",
-          0, G_MAXINT64, 1, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
+          0, G_MAXINT64, 1000, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 
   g_object_class_install_property (klass, GST_CMML_ENC_GRANULERATE_D,
       g_param_spec_int64 ("granule-rate-denominator",
           "Granulerate denominator",
           "Granulerate denominator",
-          0, G_MAXINT64, 1000, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
+          0, G_MAXINT64, 1, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 
   g_object_class_install_property (klass, GST_CMML_ENC_GRANULESHIFT,
       g_param_spec_uchar ("granule-shift",
@@ -304,15 +301,15 @@ gst_cmml_enc_new_buffer (GstCmmlEnc * enc,
     if (data)
       memcpy (GST_BUFFER_DATA (*buffer), data, size);
   } else {
-    GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
-        (NULL), ("alloc function returned error %s", gst_flow_get_name (res)));
+    GST_WARNING_OBJECT (enc, "alloc function returned error %s",
+        gst_flow_get_name (res));
   }
 
   return res;
 }
 
 static GstCaps *
-gst_cmml_enc_set_header_on_caps (GstCaps * caps,
+gst_cmml_enc_set_header_on_caps (GstCmmlEnc * enc, GstCaps * caps,
     GstBuffer * ident, GstBuffer * preamble, GstBuffer * head)
 {
   GValue array = { 0 };
@@ -387,13 +384,6 @@ gst_cmml_enc_parse_end_tag (GstCmmlEnc * enc)
   GstBuffer *buffer;
 
   GST_INFO_OBJECT (enc, "parsing end tag");
-#if 0
-  if (!enc->streaming)
-    gst_cmml_enc_flush_clips (enc);
-
-  if (GST_FLOW_IS_FATAL (enc->flow_return))
-    goto done;
-#endif
 
   /* push an empty buffer to signal EOS */
   enc->flow_return = gst_cmml_enc_new_buffer (enc, NULL, 0, &buffer);
@@ -444,24 +434,23 @@ gst_cmml_enc_parse_tag_head (GstCmmlEnc * enc, GstCmmlTagHead * head)
   headers = g_list_append (headers, head_buf);
 
   caps = gst_pad_get_caps (enc->srcpad);
-  /* this call unrefs caps and creates new caps */
-  caps = gst_cmml_enc_set_header_on_caps (caps,
+  caps = gst_cmml_enc_set_header_on_caps (enc, caps,
       ident_buf, preamble_buf, head_buf);
 
-  for (walk = headers; walk; walk = walk->next) {
-    buffer = GST_BUFFER (walk->data);
+  while (headers) {
+    buffer = GST_BUFFER (headers->data);
     /* set granulepos 0 on headers */
     GST_BUFFER_OFFSET_END (buffer) = 0;
     gst_buffer_set_caps (buffer, caps);
 
     enc->flow_return = gst_cmml_enc_push (enc, buffer);
+    headers = g_list_delete_link (headers, headers);
+
     if (GST_FLOW_IS_FATAL (enc->flow_return))
       goto push_error;
-
   }
 
   gst_caps_unref (caps);
-  g_list_free (headers);
 
   enc->sent_headers = TRUE;
   return;
@@ -481,22 +470,6 @@ alloc_error:
   return;
 }
 
-#if 0
-static void
-gst_cmml_enc_flush_clips (GstCmmlEnc * enc)
-{
-  GList *clips, *walk;
-
-  clips = gst_cmml_track_list_get_clips (enc->tracks);
-  for (walk = clips; walk; walk = g_list_next (walk)) {
-    enc->flow_return = gst_cmml_enc_push_clip (enc,
-        GST_CMML_TAG_CLIP (walk->data));
-    if (!GST_FLOW_IS_FATAL (enc->flow_return))
-      break;
-  }
-}
-#endif
-
 /* encode a CMML clip tag
  * remove the start and end attributes (GstCmmlParser does this itself) and
  * push the tag with the timestamp of its start attribute. If the tag has the
@@ -510,7 +483,7 @@ gst_cmml_enc_parse_tag_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip)
 
   /* this can happen if there's a programming error (eg user forgets to set
    * the start-time property) or if one of the gst_cmml_clock_time_from_*
-   * overflows in the GstCmmlParser code */
+   * overflows in GstCmmlParser */
   if (clip->start_time == GST_CLOCK_TIME_NONE) {
     GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
         (NULL), ("invalid start time for clip (%s)", clip->id));
@@ -519,10 +492,12 @@ gst_cmml_enc_parse_tag_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip)
     return;
   }
 
+  /* get the previous clip's start time to encode the current granulepos */
   prev_clip = gst_cmml_track_list_get_track_last_clip (enc->tracks,
       (gchar *) clip->track);
   if (prev_clip) {
     prev_clip_time = prev_clip->start_time;
+    /* we don't need the prev clip anymore */
     gst_cmml_track_list_del_clip (enc->tracks, prev_clip);
   }
 
@@ -543,10 +518,8 @@ gst_cmml_enc_push_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip,
 
   if (prev_clip_time != GST_CLOCK_TIME_NONE &&
       prev_clip_time > clip->start_time) {
-    GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
-        (NULL), ("previous clip start time > current clip (%s) start time",
-            clip->id));
-    return GST_FLOW_ERROR;
+    GST_WARNING_OBJECT (enc,
+        "previous clip start time > current clip (%s) start time", clip->id);
   }
 
   /* encode the clip */
@@ -566,6 +539,9 @@ gst_cmml_enc_push_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip,
   /* set the granulepos */
   granulepos = gst_cmml_clock_time_to_granule (prev_clip_time, clip->start_time,
       enc->granulerate_n, enc->granulerate_d, enc->granuleshift);
+  if (granulepos == -1)
+    goto granule_overflow;
+
   GST_BUFFER_OFFSET_END (buffer) = granulepos;
   GST_BUFFER_TIMESTAMP (buffer) = clip->start_time;
 
@@ -574,8 +550,7 @@ gst_cmml_enc_push_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip,
     goto done;
 
   if (clip->end_time != GST_CLOCK_TIME_NONE) {
-    /* create a new empty clip for the same cmml "track" starting at
-     * "end_time"
+    /* create a new empty clip for the same cmml track starting at end_time
      */
     GObject *end_clip = g_object_new (GST_TYPE_CMML_TAG_CLIP,
         "start-time", clip->end_time, "track", clip->track, NULL);
@@ -587,6 +562,10 @@ gst_cmml_enc_push_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip,
   }
 done:
   return res;
+
+granule_overflow:
+  GST_ELEMENT_ERROR (enc, STREAM, ENCODE, (NULL), ("granulepos overflow"));
+  return GST_FLOW_ERROR;
 }
 
 static GstFlowReturn
@@ -600,7 +579,7 @@ gst_cmml_enc_push (GstCmmlEnc * enc, GstBuffer * buffer)
   res = gst_pad_push (enc->srcpad, buffer);
   if (GST_FLOW_IS_FATAL (res))
     GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
-        (NULL), ("could not push the buffer: %s", gst_flow_get_name (res)));
+        (NULL), ("could not push buffer: %s", gst_flow_get_name (res)));
 
   return res;
 }
diff --git a/ext/annodex/gstcmmlparser.c b/ext/annodex/gstcmmlparser.c
index c7931ea6..1411478a 100644
--- a/ext/annodex/gstcmmlparser.c
+++ b/ext/annodex/gstcmmlparser.c
@@ -22,12 +22,17 @@
  */
 
 #include <string.h>
+#include <stdarg.h>
 #include <gst/gst.h>
 
 #include "gstcmmlparser.h"
 #include "gstannodex.h"
 #include "gstcmmlutils.h"
 
+GST_DEBUG_CATEGORY (cmmlparser);
+#define GST_CAT_DEFAULT cmmlparser
+
+static void gst_cmml_parser_generic_error (void *ctx, const char *msg, ...);
 static xmlNodePtr gst_cmml_parser_new_node (GstCmmlParser * parser,
     const gchar * name, ...);
 static void
@@ -42,6 +47,15 @@ static void gst_cmml_parser_parse_processing_instruction (xmlParserCtxtPtr ctxt,
 static void gst_cmml_parser_meta_to_string (GstCmmlParser * parser,
     xmlNodePtr parent, GValueArray * meta);
 
+/* initialize the parser */
+void
+gst_cmml_parser_init (void)
+{
+  GST_DEBUG_CATEGORY_INIT (cmmlparser, "cmmlparser", 0, "annodex CMML parser");
+
+  xmlGenericError = gst_cmml_parser_generic_error;
+}
+
 /* create a new CMML parser
  */
 GstCmmlParser *
@@ -58,7 +72,8 @@ gst_cmml_parser_new (GstCmmlParserMode mode)
       (startElementNsSAX2Func) gst_cmml_parser_parse_start_element_ns;
   parser->context->sax->endElementNs =
       (endElementNsSAX2Func) gst_cmml_parser_parse_end_element_ns;
-  parser->context->sax->processingInstruction = (processingInstructionSAXFunc)
+  parser->context->sax->processingInstruction =
+      (processingInstructionSAXFunc)
       gst_cmml_parser_parse_processing_instruction;
   parser->preamble_callback = NULL;
   parser->cmml_end_callback = NULL;
@@ -463,13 +478,18 @@ gst_cmml_parser_parse_clip (GstCmmlParser * parser, xmlNodePtr clip)
   GstClockTime start_time = GST_CLOCK_TIME_NONE;
   GstClockTime end_time = GST_CLOCK_TIME_NONE;
 
-  g_value_init (&str_val, G_TYPE_STRING);
+  start = xmlGetProp (clip, (xmlChar *) "start");
+  if (parser->mode == GST_CMML_PARSER_ENCODE && start == NULL)
+    /* XXX: validate the document */
+    return;
 
   id = xmlGetProp (clip, (xmlChar *) "id");
   track = xmlGetProp (clip, (xmlChar *) "track");
-  start = xmlGetProp (clip, (xmlChar *) "start");
   end = xmlGetProp (clip, (xmlChar *) "end");
 
+  if (track == NULL)
+    track = (guchar *) g_strdup ("default");
+
   if (start) {
     if (!strncmp ((gchar *) start, "smpte", 5))
       start_time = gst_cmml_clock_time_from_smpte ((gchar *) start);
@@ -484,11 +504,7 @@ gst_cmml_parser_parse_clip (GstCmmlParser * parser, xmlNodePtr clip)
       end_time = gst_cmml_clock_time_from_npt ((gchar *) end);
   }
 
-  if (track == NULL)
-    track = (guchar *) g_strdup ("default");
-
-  clip_tag = g_object_new (GST_TYPE_CMML_TAG_CLIP,
-      "id", id,
+  clip_tag = g_object_new (GST_TYPE_CMML_TAG_CLIP, "id", id,
       "track", track, "start-time", start_time, "end-time", end_time, NULL);
 
   g_free (id);
@@ -496,6 +512,8 @@ gst_cmml_parser_parse_clip (GstCmmlParser * parser, xmlNodePtr clip)
   g_free (start);
   g_free (end);
 
+  g_value_init (&str_val, G_TYPE_STRING);
+
   /* parse the children */
   for (walk = clip->children; walk; walk = walk->next) {
     /* the clip is not empty */
@@ -545,6 +563,17 @@ gst_cmml_parser_meta_to_string (GstCmmlParser * parser,
   }
 }
 
+static void
+gst_cmml_parser_generic_error (void *ctx, const char *msg, ...)
+{
+  va_list varargs;
+
+  va_start (varargs, msg);
+  gst_debug_log_valist (GST_CAT_DEFAULT, GST_LEVEL_WARNING,
+      "", "", 0, NULL, msg, varargs);
+  va_end (varargs);
+}
+
 /* sax handler called when an element start tag is found
  * this is used to parse the cmml start tag
  */
diff --git a/ext/annodex/gstcmmlparser.h b/ext/annodex/gstcmmlparser.h
index 926b5094..89c2bffa 100644
--- a/ext/annodex/gstcmmlparser.h
+++ b/ext/annodex/gstcmmlparser.h
@@ -69,6 +69,8 @@ struct _GstCmmlParser
   GstCmmlParserClipCallback clip_callback;
 };
 
+void gst_cmml_parser_init (void);
+
 GstCmmlParser *gst_cmml_parser_new (GstCmmlParserMode mode);
 void gst_cmml_parser_free (GstCmmlParser * parser);
 
diff --git a/ext/annodex/gstcmmlutils.c b/ext/annodex/gstcmmlutils.c
index bdeea0a2..9e19e681 100644
--- a/ext/annodex/gstcmmlutils.c
+++ b/ext/annodex/gstcmmlutils.c
@@ -186,13 +186,28 @@ gst_cmml_clock_time_to_granule (GstClockTime prev_time,
   if (prev_time > current_time)
     return -1;
 
+  /* GST_SECOND / (granulerate_n / granulerate_d) */
   granulerate = gst_util_uint64_scale (GST_SECOND,
-      granulerate_n, granulerate_d);
-  keyindex = prev_time / granulerate << granuleshift;
-  keyoffset = (current_time - prev_time) / granulerate;
+      granulerate_d, granulerate_n);
+
+  prev_time = prev_time / granulerate;
+  if (prev_time > (((guint64) 1 << (64 - granuleshift)) - 1))
+    /* we need more than 64 - granuleshift bits to encode prev_time */
+    goto overflow;
+
+  keyindex = prev_time << granuleshift;
+
+  keyoffset = (current_time / granulerate) - prev_time;
+  if (keyoffset > ((guint64) 1 << granuleshift) - 1)
+    /* we need more than granuleshift bits to encode prev_time - current_time */
+    goto overflow;
+
   granulepos = keyindex + keyoffset;
 
   return granulepos;
+
+overflow:
+  return -1;
 }
 
 /* track list */
@@ -221,8 +236,6 @@ gst_cmml_track_list_destroy_track (gchar * key,
 void
 gst_cmml_track_list_destroy (GHashTable * tracks)
 {
-  g_return_if_fail (tracks != NULL);
-
   g_hash_table_foreach_remove (tracks,
       (GHRFunc) gst_cmml_track_list_destroy_track, NULL);
   g_hash_table_destroy (tracks);
@@ -240,28 +253,24 @@ gst_cmml_track_list_compare_clips (GstCmmlTagClip * a, GstCmmlTagClip * b)
 void
 gst_cmml_track_list_add_clip (GHashTable * tracks, GstCmmlTagClip * clip)
 {
-  GstCmmlTrack *track = NULL;
-  gchar *track_name = NULL;
-  void *key = NULL, *value = NULL;
+  gpointer key, value;
+  GstCmmlTrack *track;
+  gchar *track_name;
 
-  /* find clip's track */
-  g_hash_table_lookup_extended (tracks, clip->track, &key, &value);
-  track_name = (gchar *) key;
-  track = (GstCmmlTrack *) track;
+  g_return_if_fail (clip->track != NULL);
 
-  if (track_name == NULL)
-    /* it doesn't exist yet: create its key */
+  if (g_hash_table_lookup_extended (tracks, clip->track, &key, &value)) {
+    track_name = (gchar *) key;
+    track = (GstCmmlTrack *) value;
+  } else {
     track_name = g_strdup ((gchar *) clip->track);
-
-  if (track == NULL)
     track = g_new0 (GstCmmlTrack, 1);
+    g_hash_table_insert (tracks, track_name, track);
+  }
 
   /* add clip to the tracklist */
   track->clips = g_list_insert_sorted (track->clips, g_object_ref (clip),
       (GCompareFunc) gst_cmml_track_list_compare_clips);
-
-  /* reset the head every time as it could change */
-  g_hash_table_insert (tracks, track_name, track);
 }
 
 gboolean
@@ -271,6 +280,8 @@ gst_cmml_track_list_del_clip (GHashTable * tracks, GstCmmlTagClip * clip)
   GList *link;
   gboolean res = FALSE;
 
+  g_return_val_if_fail (clip->track != NULL, FALSE);
+
   track = g_hash_table_lookup (tracks, clip->track);
   if (track) {
     link = g_list_find (track->clips, clip);
@@ -293,6 +304,8 @@ gst_cmml_track_list_has_clip (GHashTable * tracks, GstCmmlTagClip * clip)
   gchar *clip_id = (gchar *) clip->id;
   gboolean res = FALSE;
 
+  g_return_val_if_fail (clip_id != NULL, FALSE);
+
   track = g_hash_table_lookup (tracks, clip_id);
   if (track) {
     for (walk = track->clips; walk; walk = g_list_next (walk)) {
@@ -329,6 +342,8 @@ gst_cmml_track_list_get_track_clips (GHashTable * tracks,
 {
   GstCmmlTrack *track;
 
+  g_return_val_if_fail (track_name != NULL, NULL);
+
   track = g_hash_table_lookup (tracks, track_name);
   return track ? track->clips : NULL;
 }
@@ -350,6 +365,8 @@ gst_cmml_track_list_get_track_last_clip (GHashTable * tracks,
   GstCmmlTrack *track;
   GList *res = NULL;
 
+  g_return_val_if_fail (track_name != NULL, NULL);
+
   track = g_hash_table_lookup (tracks, track_name);
   if (track && track->clips)
     res = g_list_last (track->clips);
@@ -363,6 +380,8 @@ gst_cmml_track_list_set_data (GHashTable * tracks,
 {
   GstCmmlTrack *track;
 
+  g_return_if_fail (track_name != NULL);
+
   track = g_hash_table_lookup (tracks, track_name);
   if (track)
     track->user_data = data;
@@ -373,6 +392,8 @@ gst_cmml_track_get_data (GHashTable * tracks, const gchar * track_name)
 {
   GstCmmlTrack *track;
 
+  g_return_val_if_fail (track_name != NULL, NULL);
+
   track = g_hash_table_lookup (tracks, track_name);
   return track ? track->user_data : NULL;
 }