gstreamer/gst/gsttypefind.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gsttypefind.c:
*
* 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 "gsttype.h"
#include "gstinfo.h"
#include "gsttypefind.h"
#define DEFAULT_MAX_BUFFERS 1
GstElementDetails gst_type_find_details = {
"TypeFind",
"Generic",
"LGPL",
"Finds the media type of a stream",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>,"
"Wim Taymans <wim.taymans@chello.be>",
"(C) 1999",
};
/* TypeFind signals and args */
enum {
HAVE_TYPE,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_CAPS,
ARG_MAX_BUFFERS,
};
static void gst_type_find_class_init (GstTypeFindClass *klass);
static void gst_type_find_init (GstTypeFind *typefind);
static void gst_type_find_set_property (GObject *object, guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_type_find_get_property (GObject *object, guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gst_type_find_chain (GstPad *pad, GstBuffer *buf);
static GstElementStateReturn
gst_type_find_change_state (GstElement *element);
static GstElementClass *parent_class = NULL;
static guint gst_type_find_signals[LAST_SIGNAL] = { 0 };
GType
gst_type_find_get_type (void)
{
static GType typefind_type = 0;
if (!typefind_type) {
static const GTypeInfo typefind_info = {
sizeof(GstTypeFindClass),
NULL,
NULL,
(GClassInitFunc)gst_type_find_class_init,
NULL,
NULL,
sizeof(GstTypeFind),
0,
(GInstanceInitFunc)gst_type_find_init,
NULL
};
typefind_type = g_type_register_static (GST_TYPE_ELEMENT, "GstTypeFind", &typefind_info, 0);
}
return typefind_type;
}
static void
gst_type_find_class_init (GstTypeFindClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_CAPS,
g_param_spec_pointer ("caps", "Caps", "Found capabilities", G_PARAM_READABLE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MAX_BUFFERS,
g_param_spec_int ("max_buffers",
"Max Buffers",
"Maximal amount of buffers before giving en error (0 == unlimited)",
0, G_MAXINT, DEFAULT_MAX_BUFFERS, G_PARAM_READWRITE));
gst_type_find_signals[HAVE_TYPE] =
g_signal_new ("have_type", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstTypeFindClass, have_type), NULL, NULL,
g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1,
G_TYPE_BOXED);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_type_find_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_type_find_get_property);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_type_find_change_state);
}
static void
gst_type_find_init (GstTypeFind *typefind)
{
typefind->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
gst_element_add_pad (GST_ELEMENT (typefind), typefind->sinkpad);
gst_pad_set_chain_function (typefind->sinkpad, gst_type_find_chain);
typefind->num_buffer = 0;
typefind->max_buffers = DEFAULT_MAX_BUFFERS;
typefind->caps = NULL;
}
static void
gst_type_find_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec)
{
GstTypeFind *typefind;
g_return_if_fail (GST_IS_TYPE_FIND (object));
typefind = GST_TYPE_FIND (object);
switch (prop_id) {
case ARG_MAX_BUFFERS:
typefind->max_buffers = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_type_find_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
GstTypeFind *typefind;
g_return_if_fail (GST_IS_TYPE_FIND (object));
typefind = GST_TYPE_FIND (object);
switch (prop_id) {
case ARG_CAPS:
g_value_set_pointer (value, typefind->caps);
break;
case ARG_MAX_BUFFERS:
g_value_set_int (value, typefind->max_buffers);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_type_find_chain (GstPad *pad, GstBuffer *buf)
{
GstTypeFind *typefind;
const GList *type_list;
GstType *type;
g_return_if_fail (GST_IS_PAD (pad));
typefind = GST_TYPE_FIND (GST_OBJECT_PARENT (pad));
GST_DEBUG ("got buffer of %d bytes in '%s'",
GST_BUFFER_SIZE (buf), GST_OBJECT_NAME (typefind));
type_list = gst_type_get_list ();
while (type_list) {
GSList *factories;
type = (GstType *) type_list->data;
factories = type->factories;
while (factories) {
GstTypeFactory *factory = GST_TYPE_FACTORY (factories->data);
GstTypeFindFunc typefindfunc = (GstTypeFindFunc)factory->typefindfunc;
GstCaps *caps;
GST_CAT_DEBUG (GST_CAT_TYPES, "try type (%p) :%d \"%s\" %p",
factory, type->id, type->mime, typefindfunc);
if (typefindfunc && (caps = typefindfunc (buf, factory))) {
GST_CAT_DEBUG (GST_CAT_TYPES, "found type: %d \"%s\" \"%s\"",
caps->id, type->mime, gst_caps_get_name (caps));
typefind->caps = caps;
if (gst_pad_try_set_caps (pad, caps) <= 0) {
g_warning ("typefind: found type but peer didn't accept it");
}
{
gst_object_ref (GST_OBJECT (typefind));
g_signal_emit (G_OBJECT (typefind), gst_type_find_signals[HAVE_TYPE], 0,
typefind->caps);
gst_object_unref (GST_OBJECT (typefind));
goto end;
}
}
factories = g_slist_next (factories);
}
type_list = g_list_next (type_list);
}
typefind->num_buffer++;
end:
gst_buffer_unref (buf);
if (typefind->max_buffers && typefind->num_buffer >= typefind->max_buffers) {
gst_element_error (GST_ELEMENT (typefind),
"typefind could not determine type after %d buffers", typefind->num_buffer);
}
}
static GstElementStateReturn
gst_type_find_change_state (GstElement *element)
{
GstTypeFind *typefind;
GstElementStateReturn ret;
typefind = GST_TYPE_FIND (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
typefind->num_buffer = 0;
gst_caps_unref (typefind->caps);
typefind->caps = NULL;
break;
case GST_STATE_PAUSED_TO_PLAYING:
case GST_STATE_PLAYING_TO_PAUSED:
case GST_STATE_PAUSED_TO_READY:
case GST_STATE_READY_TO_NULL:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
return ret;
}