gstreamer/gst/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>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstshaper.h"
GST_DEBUG_CATEGORY_STATIC (gst_shaper_debug);
#define GST_CAT_DEFAULT gst_shaper_debug
GstElementDetails gst_shaper_details = GST_ELEMENT_DETAILS ("Shaper",
"Generic",
"Synchronizes streams on different pads",
"Wim Taymans <wim.taymans@chello.be>");
/* 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;
GstStaticPadTemplate shaper_src_template = GST_STATIC_PAD_TEMPLATE ("src%d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
GstStaticPadTemplate shaper_sink_template = GST_STATIC_PAD_TEMPLATE ("sink%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY);
#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;
}
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gst_shaper_debug, "shaper", 0, "shaper element");
GST_BOILERPLATE_FULL (GstShaper, gst_shaper, GstElement, GST_TYPE_ELEMENT,
_do_init);
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 void
gst_shaper_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (gstelement_class, &gst_shaper_details);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&shaper_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&shaper_sink_template));
}
static void
gst_shaper_class_init (GstShaperClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
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 GstCaps *
gst_shaper_getcaps (GstPad * pad)
{
GstPad *otherpad;
GstShaperConnection *connection;
connection = gst_pad_get_element_private (pad);
otherpad =
(pad == connection->srcpad ? connection->sinkpad : connection->srcpad);
if (GST_PAD_PEER (otherpad)) {
return gst_pad_get_caps (GST_PAD_PEER (otherpad));
} else {
return gst_caps_new_any ();
}
}
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, const GstCaps * caps)
{
GstPad *otherpad;
GstShaperConnection *connection;
connection = gst_pad_get_element_private (pad);
otherpad =
(pad == connection->srcpad ? connection->sinkpad : connection->srcpad);
return gst_pad_try_set_caps (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 (gst_static_pad_template_get
(&shaper_sink_template), padname);
g_free (padname);
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 (gst_static_pad_template_get
(&shaper_src_template), 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_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, GST_DATA (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, GST_DATA (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;
}
}