| /* |
| * 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_pad_template (element_class, |
| gst_static_pad_template_get (&sink_template)); |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&rtp_src_template)); |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&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; |
| } |