gstreamer/plugins/elements/gstshaper.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstshaper.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 <stdlib.h>
#include <gstshaper.h>
GstElementDetails gst_shaper_details = {
"Shaper",
"Generic",
"LGPL",
"Synchronizes streams on different pads",
VERSION,
"Wim Taymans <wim.taymans@chello.be>",
"(C) 2003",
};
/* Shaper signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_POLICY,
ARG_SILENT,
ARG_LAST_MESSAGE,
};
typedef struct
{
GstPad *sinkpad;
GstPad *srcpad;
GstBuffer *buffer;
} GstShaperConnection;
GST_PAD_TEMPLATE_FACTORY (shaper_src_factory,
"src%d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
NULL /* no caps */
);
GST_PAD_TEMPLATE_FACTORY (shaper_sink_factory,
"sink%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
NULL /* no caps */
);
#define GST_TYPE_SHAPER_POLICY (gst_shaper_policy_get_type())
static GType
gst_shaper_policy_get_type (void)
{
static GType shaper_policy_type = 0;
static GEnumValue shaper_policy[] = {
{ SHAPER_POLICY_TIMESTAMPS, "1", "sync on timestamps"},
{ SHAPER_POLICY_BUFFERSIZE, "2", "sync on buffer size"},
{0, NULL, NULL},
};
if (!shaper_policy_type) {
shaper_policy_type = g_enum_register_static ("GstShaperPolicy", shaper_policy);
}
return shaper_policy_type;
}
static void gst_shaper_class_init (GstShaperClass *klass);
static void gst_shaper_init (GstShaper *shaper);
static void gst_shaper_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_shaper_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstPad* gst_shaper_request_new_pad (GstElement *element, GstPadTemplate *templ,
const gchar *unused);
static void gst_shaper_loop (GstElement *element);
static GstElementClass *parent_class = NULL;
/* static guint gst_shaper_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_shaper_get_type (void)
{
static GType shaper_type = 0;
if (!shaper_type) {
static const GTypeInfo shaper_info = {
sizeof(GstShaperClass), NULL,
NULL,
(GClassInitFunc)gst_shaper_class_init,
NULL,
NULL,
sizeof(GstShaper),
0,
(GInstanceInitFunc)gst_shaper_init,
};
shaper_type = g_type_register_static (GST_TYPE_ELEMENT, "GstShaper", &shaper_info, 0);
}
return shaper_type;
}
static void
gst_shaper_class_init (GstShaperClass *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_POLICY,
g_param_spec_enum ("policy", "Policy", "Shaper policy",
GST_TYPE_SHAPER_POLICY, SHAPER_POLICY_TIMESTAMPS, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SILENT,
g_param_spec_boolean ("silent", "silent", "silent",
FALSE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LAST_MESSAGE,
g_param_spec_string ("last-message", "last-message", "last-message",
NULL, G_PARAM_READABLE));
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_shaper_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_shaper_get_property);
gstelement_class->request_new_pad = GST_DEBUG_FUNCPTR (gst_shaper_request_new_pad);
}
static GstBufferPool*
gst_shaper_get_bufferpool (GstPad *pad)
{
GstShaperConnection *connection;
connection = gst_pad_get_element_private (pad);
return gst_pad_get_bufferpool (connection->srcpad);
}
static GstCaps*
gst_shaper_getcaps (GstPad *pad, GstCaps *caps)
{
GstPad *otherpad;
GstShaperConnection *connection;
connection = gst_pad_get_element_private (pad);
otherpad = (pad == connection->srcpad ? connection->sinkpad : connection->srcpad);
return gst_pad_get_allowed_caps (otherpad);
}
static GList*
gst_shaper_get_internal_link (GstPad *pad)
{
GList *res = NULL;
GstShaperConnection *connection;
GstPad *otherpad;
connection = gst_pad_get_element_private (pad);
otherpad = (pad == connection->srcpad ? connection->sinkpad : connection->srcpad);
res = g_list_prepend (res, otherpad);
return res;
}
static GstPadLinkReturn
gst_shaper_link (GstPad *pad, GstCaps *caps)
{
GstPad *otherpad;
GstShaperConnection *connection;
connection = gst_pad_get_element_private (pad);
otherpad = (pad == connection->srcpad ? connection->sinkpad : connection->srcpad);
return gst_pad_proxy_link (otherpad, caps);
}
static GstShaperConnection*
gst_shaper_create_connection (GstShaper *shaper)
{
GstShaperConnection *connection;
gchar *padname;
shaper->nconnections++;
connection = g_new0 (GstShaperConnection, 1);
padname = g_strdup_printf ("sink%d", shaper->nconnections);
connection->sinkpad = gst_pad_new_from_template (shaper_sink_factory (), padname);
g_free (padname);
gst_pad_set_bufferpool_function (connection->sinkpad, gst_shaper_get_bufferpool);
gst_pad_set_getcaps_function (connection->sinkpad, gst_shaper_getcaps);
gst_pad_set_internal_link_function (connection->sinkpad, gst_shaper_get_internal_link);
gst_pad_set_link_function (connection->sinkpad, gst_shaper_link);
gst_pad_set_element_private (connection->sinkpad, connection);
gst_element_add_pad (GST_ELEMENT (shaper), connection->sinkpad);
padname = g_strdup_printf ("src%d", shaper->nconnections);
connection->srcpad = gst_pad_new_from_template (shaper_src_factory (), padname);
g_free (padname);
gst_pad_set_getcaps_function (connection->srcpad, gst_shaper_getcaps);
gst_pad_set_internal_link_function (connection->srcpad, gst_shaper_get_internal_link);
gst_pad_set_link_function (connection->srcpad, gst_shaper_link);
gst_pad_set_element_private (connection->srcpad, connection);
gst_element_add_pad (GST_ELEMENT (shaper), connection->srcpad);
shaper->connections = g_slist_prepend (shaper->connections, connection);
return connection;
}
static GstPad*
gst_shaper_request_new_pad (GstElement *element, GstPadTemplate *templ, const gchar *unused)
{
GstShaper *shaper = GST_SHAPER (element);
GstShaperConnection *connection;
connection = gst_shaper_create_connection (shaper);
return connection->sinkpad;
}
static void
gst_shaper_init (GstShaper *shaper)
{
gst_element_set_loop_function (GST_ELEMENT (shaper), gst_shaper_loop);
shaper->policy = SHAPER_POLICY_TIMESTAMPS;
shaper->connections = NULL;
shaper->nconnections = 0;
shaper->silent = FALSE;
shaper->last_message = NULL;
}
static void
gst_shaper_loop (GstElement *element)
{
GstShaper *shaper;
GSList *connections;
gboolean eos = TRUE;
GstShaperConnection *min = NULL;
shaper = GST_SHAPER (element);
/* first make sure we have a buffer on all pads */
connections = shaper->connections;
while (connections) {
GstShaperConnection *connection = (GstShaperConnection *) connections->data;
/* try to fill a connection without a buffer on a pad that is
* active */
if (connection->buffer == NULL && GST_PAD_IS_USABLE (connection->sinkpad)) {
GstBuffer *buffer;
buffer = gst_pad_pull (connection->sinkpad);
/* events are simply pushed ASAP */
if (GST_IS_EVENT (buffer)) {
/* save event type as it will be unreffed after the next push */
GstEventType type = GST_EVENT_TYPE (buffer);
gst_pad_push (connection->srcpad, buffer);
switch (type) {
/* on EOS we disable the pad so that we don't pull on
* it again and never get more data */
case GST_EVENT_EOS:
gst_pad_set_active (connection->sinkpad, FALSE);
break;
default:
break;
}
}
else {
/* we store the buffer */
connection->buffer = buffer;
}
}
/* FIXME policy stuff goes here */
/* find connection with lowest timestamp */
if (min == NULL || (connection->buffer != NULL &&
(GST_BUFFER_TIMESTAMP (connection->buffer) <
GST_BUFFER_TIMESTAMP (min->buffer))))
{
min = connection;
}
connections = g_slist_next (connections);
}
/* if we have a connection with a buffer, push it */
if (min != NULL && min->buffer) {
gst_pad_push (min->srcpad, min->buffer);
min->buffer = NULL;
/* since we pushed a buffer, it's not EOS */
eos = FALSE;
}
if (eos) {
gst_element_set_eos (element);
}
}
static void
gst_shaper_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstShaper *shaper;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_SHAPER (object));
shaper = GST_SHAPER (object);
switch (prop_id) {
case ARG_POLICY:
shaper->policy = g_value_get_enum (value);
break;
case ARG_SILENT:
shaper->silent = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void gst_shaper_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) {
GstShaper *shaper;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_SHAPER (object));
shaper = GST_SHAPER (object);
switch (prop_id) {
case ARG_POLICY:
g_value_set_enum (value, shaper->policy);
break;
case ARG_SILENT:
g_value_set_boolean (value, shaper->silent);
break;
case ARG_LAST_MESSAGE:
g_value_set_string (value, shaper->last_message);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_shaper_factory_init (GstElementFactory *factory)
{
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (shaper_src_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (shaper_sink_factory));
return TRUE;
}