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/*
* Copyright (c) 2014, Ericsson AB. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstdtlssrtpdemux.h"
#define PACKET_IS_DTLS(b) (b > 0x13 && b < 0x40)
#define PACKET_IS_RTP(b) (b > 0x7f && b < 0xc0)
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate rtp_src_template =
GST_STATIC_PAD_TEMPLATE ("rtp_src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp;"
"application/x-rtcp;" "application/x-srtp;" "application/x-srtcp")
);
static GstStaticPadTemplate dtls_src_template =
GST_STATIC_PAD_TEMPLATE ("dtls_src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-dtls")
);
GST_DEBUG_CATEGORY_STATIC (gst_gst_dtls_srtp_demux_debug);
#define GST_CAT_DEFAULT gst_gst_dtls_srtp_demux_debug
#define gst_dtls_srtp_demux_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstDtlsSrtpDemux, gst_dtls_srtp_demux,
GST_TYPE_ELEMENT, GST_DEBUG_CATEGORY_INIT (gst_gst_dtls_srtp_demux_debug,
"dtlssrtpdemux", 0, "DTLS SRTP Demultiplexer"));
static GstFlowReturn sink_chain (GstPad *, GstObject * self, GstBuffer *);
static void
gst_dtls_srtp_demux_class_init (GstDtlsSrtpDemuxClass * klass)
{
GstElementClass *element_class;
element_class = (GstElementClass *) klass;
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_add_static_pad_template (element_class, &rtp_src_template);
gst_element_class_add_static_pad_template (element_class, &dtls_src_template);
gst_element_class_set_static_metadata (element_class,
"DTLS SRTP Demultiplexer",
"DTLS/SRTP/Demux",
"Demultiplexes DTLS and SRTP packets",
"Patrik Oldsberg patrik.oldsberg@ericsson.com");
}
static void
gst_dtls_srtp_demux_init (GstDtlsSrtpDemux * self)
{
GstPad *sink;
sink = gst_pad_new_from_static_template (&sink_template, "sink");
self->rtp_src =
gst_pad_new_from_static_template (&rtp_src_template, "rtp_src");
self->dtls_src =
gst_pad_new_from_static_template (&dtls_src_template, "dtls_src");
g_return_if_fail (sink);
g_return_if_fail (self->rtp_src);
g_return_if_fail (self->dtls_src);
gst_pad_set_chain_function (sink, GST_DEBUG_FUNCPTR (sink_chain));
gst_element_add_pad (GST_ELEMENT (self), sink);
gst_element_add_pad (GST_ELEMENT (self), self->rtp_src);
gst_element_add_pad (GST_ELEMENT (self), self->dtls_src);
}
static GstFlowReturn
sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstDtlsSrtpDemux *self = GST_DTLS_SRTP_DEMUX (parent);
guint8 first_byte;
if (gst_buffer_get_size (buffer) == 0) {
GST_LOG_OBJECT (self, "received buffer with size 0");
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
if (gst_buffer_extract (buffer, 0, &first_byte, 1) != 1) {
GST_WARNING_OBJECT (self, "could not extract first byte from buffer");
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
if (PACKET_IS_DTLS (first_byte)) {
GST_LOG_OBJECT (self, "pushing dtls packet");
return gst_pad_push (self->dtls_src, buffer);
}
if (PACKET_IS_RTP (first_byte)) {
GST_LOG_OBJECT (self, "pushing rtp packet");
return gst_pad_push (self->rtp_src, buffer);
}
GST_WARNING_OBJECT (self, "received invalid buffer: %x", first_byte);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
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