gstreamer/gst/switch/gstswitch.c

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/* GStreamer
* Copyright (C) 2003 Julien Moutte <julien@moutte.net>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* Object header */
#include "gstswitch.h"
enum
{
ARG_0,
ARG_NB_SOURCES,
ARG_ACTIVE_SOURCE
};
GST_DEBUG_CATEGORY_STATIC (switch_debug);
/* ElementFactory information */
static GstElementDetails gst_switch_details = GST_ELEMENT_DETAILS ("Switch",
"Generic",
"N-to-1 input switching",
"Julien Moutte <julien@moutte.net>");
static GstStaticPadTemplate gst_switch_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY);
static GstElementClass *parent_class = NULL;
/* ============================================================= */
/* */
/* Private Methods */
/* */
/* ============================================================= */
static void
gst_switch_release_pad (GstElement * element, GstPad * pad)
{
GList *sinkpads = NULL;
GstSwitch *gstswitch = NULL;
GstSwitchPad *switchpad = NULL;
g_return_if_fail (GST_IS_SWITCH (element));
gstswitch = GST_SWITCH (element);
GST_LOG_OBJECT (gstswitch, "releasing requested pad %p", pad);
sinkpads = gstswitch->sinkpads;
/* Walking through our pad list searching for the pad we want to release */
while (sinkpads) {
switchpad = sinkpads->data;
if (switchpad && switchpad->sinkpad == pad)
break;
else
switchpad = NULL;
sinkpads = g_list_next (sinkpads);
}
/* Releasing the found pad */
if (switchpad) {
/* We unref the data of that pad to loose our reference */
gst_data_unref (switchpad->data);
/* If data has not been forwarded we have to destroy it */
if (!switchpad->forwarded && switchpad->data) {
gst_data_unref (switchpad->data);
}
gst_element_remove_pad (element, pad);
gstswitch->sinkpads = g_list_remove (gstswitch->sinkpads, switchpad);
gstswitch->nb_sinkpads--;
if (gstswitch->active_sinkpad >= gstswitch->nb_sinkpads)
gstswitch->active_sinkpad = 0;
g_free (switchpad);
}
}
static GstPad *
gst_switch_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * unused)
{
char *name = NULL;
GstPad *sinkpad = NULL;
GstSwitch *gstswitch = NULL;
GstSwitchPad *switchpad = NULL;
g_return_val_if_fail (GST_IS_SWITCH (element), NULL);
gstswitch = GST_SWITCH (element);
/* We only provide requested sink pads */
if (templ->direction != GST_PAD_SINK) {
GST_LOG_OBJECT (gstswitch, "requested a non sink pad");
return NULL;
}
name = g_strdup_printf ("sink%d", gstswitch->nb_sinkpads);
sinkpad = gst_pad_new_from_template (templ, name);
if (name)
g_free (name);
/* That pad will proxy caps and link */
gst_pad_set_link_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_pad_link));
gst_pad_set_getcaps_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
gst_element_add_pad (GST_ELEMENT (gstswitch), sinkpad);
switchpad = g_new0 (GstSwitchPad, 1);
if (!switchpad)
return NULL;
switchpad->sinkpad = sinkpad;
switchpad->data = NULL;
switchpad->forwarded = FALSE;
switchpad->eos = FALSE;
gstswitch->sinkpads = g_list_insert (gstswitch->sinkpads, switchpad,
gstswitch->nb_sinkpads);
gstswitch->nb_sinkpads++;
if (GST_PAD_CAPS (gstswitch->srcpad)) {
gst_pad_try_set_caps (sinkpad, GST_PAD_CAPS (gstswitch->srcpad));
}
return sinkpad;
}
static gboolean
gst_switch_poll_sinkpads (GstSwitch * gstswitch)
{
GList *pads;
g_return_val_if_fail (gstswitch != NULL, FALSE);
g_return_val_if_fail (GST_IS_SWITCH (gstswitch), FALSE);
pads = gstswitch->sinkpads;
while (pads) {
GstSwitchPad *switchpad = pads->data;
/* We only pull from usable pads and non EOS pads */
if (GST_PAD_IS_USABLE (switchpad->sinkpad) && !switchpad->eos) {
GST_LOG_OBJECT (gstswitch, "polling pad %p", switchpad->sinkpad);
/* We loose the reference to the data we stored */
if (switchpad->data) {
gst_data_unref (switchpad->data);
}
/* If that data was not forwarded we unref it another time to destroy it */
if (!switchpad->forwarded && switchpad->data) {
gst_data_unref (switchpad->data);
}
switchpad->data = NULL;
switchpad->data = gst_pad_pull (switchpad->sinkpad);
if (!switchpad->data) {
GST_LOG_OBJECT (gstswitch,
"received NULL data from pad %p", switchpad->sinkpad);
} else {
gst_data_ref (switchpad->data);
switchpad->forwarded = FALSE;
/* If the buffer is an EOS event we tag the pad as being in EOS. That
means we won't try to pull more data from that pad */
if (GST_IS_EVENT (switchpad->data) &&
(GST_EVENT_TYPE (GST_EVENT (switchpad->data)) == GST_EVENT_EOS)) {
GST_LOG_OBJECT (gstswitch,
"received EOS event on pad %p", switchpad->sinkpad);
switchpad->eos = TRUE;
}
}
} else {
GST_LOG_OBJECT (gstswitch,
"not pulling from pad %s (eos is %d)",
gst_pad_get_name (switchpad->sinkpad), switchpad->eos);
}
pads = g_list_next (pads);
}
return TRUE;
}
static void
gst_switch_loop (GstElement * element)
{
GstSwitch *gstswitch = NULL;
GstSwitchPad *switchpad = NULL;
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_SWITCH (element));
gstswitch = GST_SWITCH (element);
/* We poll all our sinkpads */
gst_switch_poll_sinkpads (gstswitch);
/* We get the active sinkpad */
switchpad = g_list_nth_data (gstswitch->sinkpads, gstswitch->active_sinkpad);
if (switchpad && switchpad->data) {
GstData *data = switchpad->data;
/* Loose our reference to that data */
gst_data_unref (switchpad->data);
switchpad->data = NULL;
GST_LOG_OBJECT (gstswitch,
"using data from active pad %p", switchpad->sinkpad);
if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT (data);
GST_LOG_OBJECT (gstswitch,
"handling event from active pad %p", switchpad->sinkpad);
/* Handling event */
gst_pad_event_default (switchpad->sinkpad, event);
} else {
/* Pushing active sinkpad data to srcpad */
GST_LOG_OBJECT (gstswitch,
"pushing data from active pad %p to %p",
switchpad->sinkpad, gstswitch->srcpad);
gst_pad_push (gstswitch->srcpad, data);
}
/* Mark this data as forwarded so that it won't get unrefed on next poll */
switchpad->forwarded = TRUE;
}
}
static GstStateChangeReturn
gst_switch_change_state (GstElement * element, GstStateChange transition)
{
GstSwitch *gstswitch;
gstswitch = GST_SWITCH (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
{
GList *sinkpads = NULL;
sinkpads = gstswitch->sinkpads;
while (sinkpads) {
GstSwitchPad *switchpad = sinkpads->data;
/* If a data is still stored in our structure we unref it */
if (switchpad->data) {
gst_data_unref (switchpad->data);
switchpad->data = NULL;
}
switchpad->forwarded = FALSE;
switchpad->eos = FALSE;
sinkpads = g_list_next (sinkpads);
}
}
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
else
return GST_STATE_CHANGE_SUCCESS;
}
/* =========================================== */
/* */
/* Properties */
/* */
/* =========================================== */
static void
gst_switch_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSwitch *gstswitch = NULL;
g_return_if_fail (GST_IS_SWITCH (object));
gstswitch = GST_SWITCH (object);
switch (prop_id) {
case ARG_ACTIVE_SOURCE:
gstswitch->active_sinkpad = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_switch_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSwitch *gstswitch = NULL;
g_return_if_fail (GST_IS_SWITCH (object));
gstswitch = GST_SWITCH (object);
switch (prop_id) {
case ARG_ACTIVE_SOURCE:
g_value_set_int (value, gstswitch->active_sinkpad);
break;
case ARG_NB_SOURCES:
g_value_set_int (value, gstswitch->nb_sinkpads);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* =========================================== */
/* */
/* Init & Class init */
/* */
/* =========================================== */
static void
gst_switch_dispose (GObject * object)
{
GstSwitch *gstswitch = NULL;
GList *sinkpads = NULL;
gstswitch = GST_SWITCH (object);
sinkpads = gstswitch->sinkpads;
while (sinkpads) {
GstSwitchPad *switchpad = sinkpads->data;
/* If a data is still stored in our structure we unref it */
if (switchpad->data) {
gst_data_unref (switchpad->data);
switchpad->data = NULL;
}
/* Freeing our structure */
g_free (switchpad);
sinkpads = g_list_next (sinkpads);
}
/* Freeing the list correctly */
if (gstswitch->sinkpads) {
g_list_free (gstswitch->sinkpads);
gstswitch->sinkpads = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_switch_init (GstSwitch * gstswitch)
{
gstswitch->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (gstswitch), gstswitch->srcpad);
gst_pad_set_link_function (gstswitch->srcpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_pad_link));
gst_pad_set_getcaps_function (gstswitch->srcpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
gst_element_set_loop_function (GST_ELEMENT (gstswitch), gst_switch_loop);
gstswitch->sinkpads = NULL;
gstswitch->active_sinkpad = 0;
gstswitch->nb_sinkpads = 0;
}
static void
gst_switch_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_switch_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_switch_sink_factory));
}
static void
gst_switch_class_init (GstSwitchClass * 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 (gobject_class,
ARG_NB_SOURCES,
g_param_spec_int ("nb_sources",
"number of sources",
"number of sources", G_MININT, G_MAXINT, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
ARG_ACTIVE_SOURCE,
g_param_spec_int ("active_source",
"active source",
"active source", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE));
gobject_class->dispose = gst_switch_dispose;
gobject_class->set_property = gst_switch_set_property;
gobject_class->get_property = gst_switch_get_property;
gstelement_class->change_state = gst_switch_change_state;
gstelement_class->request_new_pad = gst_switch_request_new_pad;
gstelement_class->release_pad = gst_switch_release_pad;
}
/* ============================================================= */
/* */
/* Public Methods */
/* */
/* ============================================================= */
GType
gst_switch_get_type (void)
{
static GType switch_type = 0;
if (!switch_type) {
static const GTypeInfo switch_info = {
sizeof (GstSwitchClass),
gst_switch_base_init,
NULL,
(GClassInitFunc) gst_switch_class_init,
NULL,
NULL,
sizeof (GstSwitch),
0,
(GInstanceInitFunc) gst_switch_init,
};
switch_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstSwitch", &switch_info, 0);
GST_DEBUG_CATEGORY_INIT (switch_debug, "switch", 0, "the switch element");
}
return switch_type;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "switch", GST_RANK_NONE,
GST_TYPE_SWITCH);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"switch",
"N-to-1 input switching",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)