gstreamer/gst/debug/gstnavseek.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2003> David Schleef <ds@schleef.org>
*
* 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.
*/
/*
* This file was (probably) generated from gstnavseek.c,
* gstnavseek.c,v 1.7 2003/11/08 02:48:59 dschleef Exp
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gstnavseek.h>
#include <string.h>
#include <math.h>
/* GstNavSeek signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_SEEKOFFSET
/* FILL ME */
};
GstStaticPadTemplate navseek_src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GstStaticPadTemplate navseek_sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static void gst_navseek_base_init (gpointer g_class);
static void gst_navseek_class_init (gpointer g_class, gpointer class_data);
static void gst_navseek_init (GTypeInstance * instance, gpointer g_class);
static gboolean gst_navseek_handle_src_event (GstPad * pad, GstEvent * event);
static void gst_navseek_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_navseek_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_navseek_chain (GstPad * pad, GstData * _data);
static GType
gst_navseek_get_type (void)
{
static GType navseek_type = 0;
if (!navseek_type) {
static const GTypeInfo navseek_info = {
sizeof (GstNavSeekClass),
gst_navseek_base_init,
NULL,
gst_navseek_class_init,
NULL,
NULL,
sizeof (GstNavSeek),
0,
gst_navseek_init,
};
navseek_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstNavSeek", &navseek_info, 0);
}
return navseek_type;
}
static void
gst_navseek_base_init (gpointer g_class)
{
static GstElementDetails navseek_details =
GST_ELEMENT_DETAILS ("Seek based on left-right arrows",
"Filter/Video",
"Seek based on navigation keys left-right",
"Jan Schmidt <thaytan@mad.scientist.com>");
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&navseek_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&navseek_src_template));
gst_element_class_set_details (element_class, &navseek_details);
}
static void
gst_navseek_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (g_class);
g_object_class_install_property (G_OBJECT_CLASS (g_class),
ARG_SEEKOFFSET, g_param_spec_double ("seek-offset", "Seek Offset",
"Time in seconds to seek by", 0.0, G_MAXDOUBLE, 5.0,
G_PARAM_READWRITE));
gobject_class->set_property = gst_navseek_set_property;
gobject_class->get_property = gst_navseek_get_property;
}
static void
gst_navseek_init (GTypeInstance * instance, gpointer g_class)
{
GstNavSeek *navseek = GST_NAVSEEK (instance);
navseek->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&navseek_sink_template), "sink");
gst_element_add_pad (GST_ELEMENT (navseek), navseek->sinkpad);
gst_pad_set_chain_function (navseek->sinkpad, gst_navseek_chain);
gst_pad_set_link_function (navseek->sinkpad, gst_pad_proxy_pad_link);
gst_pad_set_getcaps_function (navseek->sinkpad, gst_pad_proxy_getcaps);
navseek->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&navseek_src_template), "src");
gst_element_add_pad (GST_ELEMENT (navseek), navseek->srcpad);
gst_pad_set_link_function (navseek->srcpad, gst_pad_proxy_pad_link);
gst_pad_set_getcaps_function (navseek->srcpad, gst_pad_proxy_getcaps);
gst_pad_set_event_function (navseek->srcpad, gst_navseek_handle_src_event);
navseek->seek_offset = 5.0;
}
static void
gst_navseek_seek (GstNavSeek * navseek, gint64 offset)
{
/* Query for the current time then attempt to set to time + offset */
gint64 peer_value;
GstFormat peer_format = GST_FORMAT_TIME;
if (gst_pad_query (gst_pad_get_peer (navseek->sinkpad),
GST_QUERY_POSITION, &peer_format, &peer_value)) {
if (peer_format != GST_FORMAT_TIME)
return;
peer_value += offset;
if (peer_value < 0)
peer_value = 0;
gst_element_seek (GST_ELEMENT (navseek),
GST_SEEK_METHOD_SET | GST_FORMAT_TIME | GST_SEEK_FLAG_ACCURATE |
GST_SEEK_FLAG_FLUSH, peer_value);
}
}
static gboolean
gst_navseek_handle_src_event (GstPad * pad, GstEvent * event)
{
GstNavSeek *navseek;
navseek = GST_NAVSEEK (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:
/* Check for a keyup and convert left/right to a seek event */
{
GstStructure *structure;
const gchar *event_type;
structure = event->event_data.structure.structure;
event_type = gst_structure_get_string (structure, "event");
g_return_val_if_fail (event != NULL, FALSE);
if (strcmp (event_type, "key-press") == 0) {
const char *key = gst_structure_get_string (structure, "key");
g_assert (key != NULL);
if (strcmp (key, "Left") == 0) {
/* Seek backward by 5 secs */
gst_navseek_seek (navseek, -1.0 * navseek->seek_offset * GST_SECOND);
} else if (strcmp (key, "Right") == 0) {
/* Seek forward */
gst_navseek_seek (navseek, navseek->seek_offset * GST_SECOND);
}
} else {
break;
}
gst_event_unref (event);
event = NULL;
}
break;
default:
break;
}
if (event) {
return gst_pad_send_event (gst_pad_get_peer (navseek->sinkpad), event);
}
return TRUE;
}
static void
gst_navseek_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstNavSeek *src;
g_return_if_fail (GST_IS_NAVSEEK (object));
src = GST_NAVSEEK (object);
switch (prop_id) {
case ARG_SEEKOFFSET:
src->seek_offset = g_value_get_double (value);
break;
default:
break;
}
}
static void
gst_navseek_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstNavSeek *src;
g_return_if_fail (GST_IS_NAVSEEK (object));
src = GST_NAVSEEK (object);
switch (prop_id) {
case ARG_SEEKOFFSET:
g_value_set_double (value, src->seek_offset);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_navseek_chain (GstPad * pad, GstData * _data)
{
GstNavSeek *navseek;
navseek = GST_NAVSEEK (gst_pad_get_parent (pad));
gst_pad_push (navseek->srcpad, _data);
}
gboolean
gst_navseek_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "navseek", GST_RANK_NONE,
GST_TYPE_NAVSEEK);
}