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fixed bug in datastructure usage

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Original commit message from CVS:
fixed bug in datastructure usage
This commit is contained in:
Erik Walthinsen 2001-05-06 22:48:41 +00:00
parent e88151bc2e
commit 5bb3603feb
1 changed files with 25 additions and 7 deletions
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32
gst/autoplug/gstautoplugcache.c
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@ -53,16 +53,19 @@ struct _GstAutoplugCache {
GList *cache_start;
gint buffer_count;
GList *current_playout;
gboolean fire_empty;
};
struct _GstAutoplugCacheClass {
GstElementClass parent_class;
void (*cache_empty) (GstElement *element);
};
/* Cache signals and args */
enum {
/* FILL ME */
CACHE_EMPTY,
LAST_SIGNAL
};
@ -85,7 +88,7 @@ static GstElementStateReturn gst_autoplugcache_change_state (GstElement *element
static GstElementClass *parent_class = NULL;
//static guint gst_autoplugcache_signals[LAST_SIGNAL] = { 0 };
static guint gst_autoplugcache_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_autoplugcache_get_type(void) {
@ -118,6 +121,12 @@ gst_autoplugcache_class_init (GstAutoplugCacheClass *klass)
parent_class = gtk_type_class (GST_TYPE_ELEMENT);
gst_autoplugcache_signals[CACHE_EMPTY] =
gtk_signal_new ("cache_empty", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstAutoplugCacheClass, cache_empty),
gtk_marshal_NONE__NONE, GTK_TYPE_NONE, 0);
gtk_object_class_add_signals (gtkobject_class, gst_autoplugcache_signals, LAST_SIGNAL);
gtk_object_add_arg_type ("GstAutoplugCache::buffer_count", GTK_TYPE_INT,
GTK_ARG_READABLE, ARG_BUFFER_COUNT);
gtk_object_add_arg_type ("GstAutoplugCache::reset", GTK_TYPE_BOOL,
@ -140,9 +149,12 @@ gst_autoplugcache_init (GstAutoplugCache *cache)
cache->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT(cache), cache->srcpad);
cache->cache = NULL;
// provide a zero basis for the cache
cache->cache = g_list_prepend(NULL, NULL);
cache->cache_start = cache->cache;
cache->buffer_count = 0;
cache->current_playout = 0;
cache->fire_empty = FALSE;
}
static void
@ -169,14 +181,12 @@ gst_autoplugcache_loop (GstElement *element)
do {
// the first time through, the current_playout pointer is going to be NULL
if (cache->current_playout == NULL) {
fprintf(stderr,"current_playout is NULL, first time\n");
// get a buffer
buf = gst_pad_pull (cache->sinkpad);
// add it to the cache, though cache == NULL
gst_buffer_ref (buf);
cache->cache = g_list_prepend (cache->cache, buf);
cache->cache_start = cache->cache;
cache->buffer_count++;
// set the current_playout pointer
@ -188,7 +198,13 @@ fprintf(stderr,"current_playout is NULL, first time\n");
// the steady state is where the playout is at the front of the cache
else if (g_list_previous(cache->current_playout) == NULL) {
fprintf(stderr,"current_playout doesn't have a previous\n");
// if we've been told to fire an empty signal (after a reset)
if (cache->fire_empty) {
fprintf(stderr,"at front of cache, about to pull, but firing signal\n");
gtk_signal_emit (GTK_OBJECT(cache), gst_autoplugcache_signals[CACHE_EMPTY], NULL);
}
// get a buffer
buf = gst_pad_pull (cache->sinkpad);
@ -206,7 +222,6 @@ fprintf(stderr,"current_playout doesn't have a previous\n");
// otherwise we're trundling through existing cached buffers
else {
fprintf(stderr,"current_playout as a previous\n");
// move the current_playout pointer
cache->current_playout = g_list_previous (cache->current_playout);
@ -238,8 +253,11 @@ gst_autoplugcache_set_arg (GtkObject *object, GtkArg *arg, guint id)
case ARG_RESET:
// no idea why anyone would set this to FALSE, but just in case ;-)
if (GTK_VALUE_BOOL(*arg)) {
fprintf(stderr,"resetting playout pointer\n");
// reset the playout pointer to the begining again
cache->current_playout = cache->cache_start;
// now we can fire a signal when the cache runs dry
cache->fire_empty = TRUE;
}
break;
default: