gstreamer/ext/srt/gstsrtbasesrc.c

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/* GStreamer SRT plugin based on libsrt
* Copyright (C) 2017, Collabora Ltd.
* Author:Justin Kim <justin.kim@collabora.com>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsrtbasesrc.h"
#include "gstsrt.h"
#include <srt/srt.h>
#include <gio/gio.h>
#define GST_CAT_DEFAULT gst_debug_srt_base_src
GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
enum
{
PROP_URI = 1,
PROP_CAPS,
PROP_LATENCY,
PROP_PASSPHRASE,
PROP_KEY_LENGTH,
/*< private > */
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
static void gst_srt_base_src_uri_handler_init (gpointer g_iface,
gpointer iface_data);
static gchar *gst_srt_base_src_uri_get_uri (GstURIHandler * handler);
static gboolean gst_srt_base_src_uri_set_uri (GstURIHandler * handler,
const gchar * uri, GError ** error);
#define gst_srt_base_src_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstSRTBaseSrc, gst_srt_base_src,
GST_TYPE_PUSH_SRC, G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER,
gst_srt_base_src_uri_handler_init)
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "srtbasesrc", 0,
"SRT Base Source"));
static void
gst_srt_base_src_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstSRTBaseSrc *self = GST_SRT_BASE_SRC (object);
switch (prop_id) {
case PROP_URI:
if (self->uri != NULL) {
gchar *uri_str = gst_srt_base_src_uri_get_uri (GST_URI_HANDLER (self));
g_value_take_string (value, uri_str);
}
break;
case PROP_CAPS:
GST_OBJECT_LOCK (self);
gst_value_set_caps (value, self->caps);
GST_OBJECT_UNLOCK (self);
break;
case PROP_LATENCY:
g_value_set_int (value, self->latency);
break;
case PROP_PASSPHRASE:
g_value_set_string (value, self->passphrase);
break;
case PROP_KEY_LENGTH:
g_value_set_int (value, self->key_length);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_srt_base_src_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstSRTBaseSrc *self = GST_SRT_BASE_SRC (object);
switch (prop_id) {
case PROP_URI:
gst_srt_base_src_uri_set_uri (GST_URI_HANDLER (self),
g_value_get_string (value), NULL);
break;
case PROP_CAPS:
GST_OBJECT_LOCK (self);
g_clear_pointer (&self->caps, gst_caps_unref);
self->caps = gst_caps_copy (gst_value_get_caps (value));
GST_OBJECT_UNLOCK (self);
break;
case PROP_LATENCY:
self->latency = g_value_get_int (value);
break;
case PROP_PASSPHRASE:
g_free (self->passphrase);
self->passphrase = g_value_dup_string (value);
break;
case PROP_KEY_LENGTH:
{
gint key_length = g_value_get_int (value);
g_return_if_fail (key_length == 16 || key_length == 24
|| key_length == 32);
self->key_length = key_length;
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_srt_base_src_finalize (GObject * object)
{
GstSRTBaseSrc *self = GST_SRT_BASE_SRC (object);
g_clear_pointer (&self->uri, gst_uri_unref);
g_clear_pointer (&self->caps, gst_caps_unref);
g_clear_pointer (&self->passphrase, g_free);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_srt_base_src_get_caps (GstBaseSrc * src, GstCaps * filter)
{
GstSRTBaseSrc *self = GST_SRT_BASE_SRC (src);
GstCaps *result, *caps = NULL;
GST_OBJECT_LOCK (self);
if (self->caps != NULL) {
caps = gst_caps_ref (self->caps);
}
GST_OBJECT_UNLOCK (self);
if (caps) {
if (filter) {
result = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
} else {
result = caps;
}
} else {
result = (filter) ? gst_caps_ref (filter) : gst_caps_new_any ();
}
return result;
}
static void
gst_srt_base_src_class_init (GstSRTBaseSrcClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseSrcClass *gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
gobject_class->set_property = gst_srt_base_src_set_property;
gobject_class->get_property = gst_srt_base_src_get_property;
gobject_class->finalize = gst_srt_base_src_finalize;
/**
* GstSRTBaseSrc:uri:
*
* The URI used by SRT Connection.
*/
properties[PROP_URI] = g_param_spec_string ("uri", "URI",
"URI in the form of srt://address:port", SRT_DEFAULT_URI,
G_PARAM_READWRITE | GST_PARAM_MUTABLE_READY | G_PARAM_STATIC_STRINGS);
/**
* GstSRTBaseSrc:caps:
*
* The Caps used by the source pad.
*/
properties[PROP_CAPS] =
g_param_spec_boxed ("caps", "Caps", "The caps of the source pad",
GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_LATENCY] =
g_param_spec_int ("latency", "latency",
"Minimum latency (milliseconds)", 0,
G_MAXINT32, SRT_DEFAULT_LATENCY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_PASSPHRASE] = g_param_spec_string ("passphrase", "Passphrase",
"The password for the encrypted transmission", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_KEY_LENGTH] =
g_param_spec_int ("key-length", "key length",
"Crypto key length in bytes{16,24,32}", 16,
32, SRT_DEFAULT_KEY_LENGTH, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, PROP_LAST, properties);
gstbasesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_srt_base_src_get_caps);
}
static void
gst_srt_base_src_init (GstSRTBaseSrc * self)
{
gst_srt_base_src_uri_set_uri (GST_URI_HANDLER (self), SRT_DEFAULT_URI, NULL);
gst_base_src_set_format (GST_BASE_SRC (self), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (self), TRUE);
self->latency = SRT_DEFAULT_LATENCY;
self->key_length = SRT_DEFAULT_KEY_LENGTH;
}
static GstURIType
gst_srt_base_src_uri_get_type (GType type)
{
return GST_URI_SRC;
}
static const gchar *const *
gst_srt_base_src_uri_get_protocols (GType type)
{
static const gchar *protocols[] = { SRT_URI_SCHEME, NULL };
return protocols;
}
static gchar *
gst_srt_base_src_uri_get_uri (GstURIHandler * handler)
{
gchar *uri_str;
GstSRTBaseSrc *self = GST_SRT_BASE_SRC (handler);
GST_OBJECT_LOCK (self);
uri_str = gst_uri_to_string (self->uri);
GST_OBJECT_UNLOCK (self);
return uri_str;
}
static gboolean
gst_srt_base_src_uri_set_uri (GstURIHandler * handler,
const gchar * uri, GError ** error)
{
GstSRTBaseSrc *self = GST_SRT_BASE_SRC (handler);
gboolean ret = TRUE;
GstUri *parsed_uri = gst_uri_from_string (uri);
if (g_strcmp0 (gst_uri_get_scheme (parsed_uri), SRT_URI_SCHEME) != 0) {
g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_URI,
"Invalid SRT URI scheme");
ret = FALSE;
goto out;
}
GST_OBJECT_LOCK (self);
g_clear_pointer (&self->uri, gst_uri_unref);
self->uri = gst_uri_ref (parsed_uri);
GST_OBJECT_UNLOCK (self);
out:
g_clear_pointer (&parsed_uri, gst_uri_unref);
return ret;
}
static void
gst_srt_base_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_srt_base_src_uri_get_type;
iface->get_protocols = gst_srt_base_src_uri_get_protocols;
iface->get_uri = gst_srt_base_src_uri_get_uri;
iface->set_uri = gst_srt_base_src_uri_set_uri;
}