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%%============================================================================== |
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%% Copyright 2018 Erlang Solutions Ltd. |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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%%============================================================================== |
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%% |
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%% @author Michal Piotrowski <michal.piotrowski@erlang-solutions.com> |
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-module(jingle_to_sdp). |
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%% @doc this modules translates jingle stanza to a sdp packet |
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%% |
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-export([from_media/1]). |
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-export([parse_transport_element/1]). |
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-include("mongoose.hrl"). |
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-include("jlib.hrl"). |
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-include_lib("nksip/include/nksip.hrl"). |
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-type rtphdr_ext() :: {ID :: binary(), URI :: binary(), Senders :: binary()}. |
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-type source() :: {SSRC :: binary(), [{binary(), binary()}]}. |
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-type content() :: #{media := undefined | binary(), |
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name := undefined | binary(), |
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protocol := binary(), |
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description := description(), |
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transport := transport(), |
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senders := binary()}. |
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-type description() :: #{codecs := [codec()], |
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rtphdr_ext := [rtphdr_ext()], |
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rtcp_mux := boolean(), |
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sources := [source()]}. |
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-type transport() :: #{ufrag := undefined | binary(), |
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pwd := undefined | binary(), |
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fingerprint => fingerprint(), |
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candidates => candidate()}. |
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-type codec() :: #{id := binary(), |
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name := binary(), |
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clock_rate := binary(), |
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channels := binary(), |
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params := [param()], %% basic codec parameters. |
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rtcp_fb_params := rtcp_fb_param()}. |
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-type param() :: {binary(), binary()}. |
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-type rtcp_fb_param() :: [binary()]. |
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-type fingerprint() :: {Hash :: undefined | binary(), Setup :: undefined | binary(), |
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Fingerprint :: binary()}. |
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-type candidate() :: any(). |
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-export_type([content/0]). |
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-spec from_media(exml:element()) -> content(). |
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from_media(#xmlel{name = <<"content">>} = JingleContent) -> |
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Content = #{name => exml_query:attr(JingleContent, <<"name">>), |
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protocol => <<"UDP/TLS/RTP/SAVPF">>, |
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senders => decode_senders(JingleContent)}, |
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parse_content_children(Content, JingleContent#xmlel.children). |
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-spec parse_content_children(map(), list()) -> content(). |
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parse_content_children(Content, []) -> |
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Content; |
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parse_content_children(Content, [Child | Rest]) -> |
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NewContent = parse_content_child(Child, Content), |
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parse_content_children(NewContent, Rest). |
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parse_content_child(#xmlel{name = <<"description">>} = DescriptionEl, Content) -> |
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Description = #{codecs => [], |
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rtphdr_ext => [], |
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rtcp_mux => false, |
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sources => []}, |
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Media = exml_query:attr(DescriptionEl, <<"media">>), |
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NewDescription = parse_description_children(Description, DescriptionEl#xmlel.children), |
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Content#{description => NewDescription, media => Media}; |
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parse_content_child(#xmlel{name = <<"transport">>} = TransportEl, Content) -> |
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NewTransport = parse_transport_element(TransportEl), |
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Content#{transport => NewTransport}; |
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parse_content_child(_, Content) -> |
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:-( |
Content. |
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-spec parse_transport_element(exml:element()) -> transport(). |
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parse_transport_element(TransportEl) -> |
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Ufrag = exml_query:attr(TransportEl, <<"ufrag">>), |
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Pwd = exml_query:attr(TransportEl, <<"pwd">>), |
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Transport = #{ufrag => Ufrag, |
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pwd => Pwd, |
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candidates => []}, |
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parse_transport_children(Transport, TransportEl#xmlel.children). |
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-spec parse_description_children(map(), list()) -> description(). |
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parse_description_children(Desc, []) -> |
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Desc; |
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parse_description_children(Desc, [Child | Rest]) -> |
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NewDesc = parse_description_child(Child, Desc), |
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parse_description_children(NewDesc, Rest). |
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parse_description_child(#xmlel{name = <<"payload-type">>} = Payload, Description) -> |
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fill_codec(Description, Payload); |
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parse_description_child(#xmlel{name = <<"rtp-hdrext">>} = RTPHdrExtEl, Description) -> |
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RTPHdrExts = maps:get(rtphdr_ext, Description), |
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RTPHdrExt = decode_rtp_hdr_ext(RTPHdrExtEl), |
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Description#{rtphdr_ext := [RTPHdrExt | RTPHdrExts]}; |
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parse_description_child(#xmlel{name = <<"rtcp-mux">>}, Description) -> |
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Description#{rtcp_mux := true}; |
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parse_description_child(#xmlel{name = <<"source">>} = SourceEl, Description) -> |
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fill_source(Description, SourceEl); |
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parse_description_child(_, Content) -> |
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:-( |
Content. |
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fill_codec(#{codecs := Codecs} = Desc, Payload) -> |
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ID = exml_query:attr(Payload, <<"id">>), |
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Name = exml_query:attr(Payload, <<"name">>), |
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ClockRate = exml_query:attr(Payload, <<"clockrate">>), |
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Channels = exml_query:attr(Payload, <<"channels">>, <<"1">>), |
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Codec = #{id => ID, |
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name => Name, |
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clock_rate => ClockRate, |
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channels => Channels, |
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params => [], |
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rtcp_fb_params => []}, |
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FinalCodec = parse_payload_children(Codec, Payload#xmlel.children), |
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Desc#{codecs := [FinalCodec | Codecs]}. |
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parse_payload_children(Codec, []) -> |
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Codec; |
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parse_payload_children(Codec, [Child | Rest]) -> |
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UpdatedCodec = parse_payload_child(Child, Codec), |
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parse_payload_children(UpdatedCodec, Rest). |
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parse_payload_child(#xmlel{name = <<"parameter">>} = BasicParam, |
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#{params := Params} = Codec) -> |
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Name = exml_query:attr(BasicParam, <<"name">>), |
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Value = exml_query:attr(BasicParam, <<"value">>), |
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NewParams = [{Name, Value} | Params], |
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Codec#{params := NewParams}; |
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parse_payload_child(#xmlel{name = <<"rtcp-fb">>} = RTCPParam, |
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#{rtcp_fb_params := Params} = Codec) -> |
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Param = decode_rtcp_fb_param(RTCPParam), |
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NewParams = [Param | Params], |
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Codec#{rtcp_fb_params := NewParams}; |
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parse_payload_child(_, Codec) -> |
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:-( |
Codec. |
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decode_rtcp_fb_param(RTCPParam) -> |
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Type = exml_query:attr(RTCPParam, <<"type">>), |
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case exml_query:attr(RTCPParam, <<"subtype">>) of |
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undefined -> |
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[Type]; |
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SubType -> |
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:-( |
[Type, SubType] |
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end. |
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decode_rtp_hdr_ext(RTPHdrExtEl) -> |
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ID = exml_query:attr(RTPHdrExtEl, <<"id">>), |
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URI = exml_query:attr(RTPHdrExtEl, <<"uri">>), |
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Senders = exml_query:attr(RTPHdrExtEl, <<"senders">>, <<"both">>), |
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{ID, URI, sender_to_sdp_attr(Senders)}. |
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fill_source(#{sources := Sources} = Desc, SourceEl) -> |
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Params = exml_query:subelements(SourceEl, <<"parameter">>), |
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KV = [source_param_to_kv(Param) || Param <- Params], |
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ID = exml_query:attr(SourceEl, <<"ssrc">>), |
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Desc#{sources := [{ID, KV} | Sources]}. |
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source_param_to_kv(El) -> |
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Name = exml_query:attr(El, <<"name">>), |
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Value = exml_query:attr(El, <<"value">>), |
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{Name, Value}. |
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decode_senders(ContentEl) -> |
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SenderValue = exml_query:attr(ContentEl, <<"senders">>, <<"both">>), |
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sender_to_sdp_attr(SenderValue). |
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sender_to_sdp_attr(<<"both">>) -> <<"sendrecv">>; |
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:-( |
sender_to_sdp_attr(<<"initiator">>) -> <<"sendonly">>; |
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sender_to_sdp_attr(<<"responder">>) -> <<"recvonly">>; |
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sender_to_sdp_attr(<<"none">>) -> <<"inactive">>. |
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parse_transport_children(Transport, []) -> |
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Transport; |
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parse_transport_children(Transport, [Child | Rest]) -> |
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NewTransport = parse_transport_child(Child, Transport), |
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parse_transport_children(NewTransport, Rest). |
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parse_transport_child(#xmlel{name = <<"fingerprint">>} = FingerprintEl, Transport) -> |
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Hash = exml_query:attr(FingerprintEl, <<"hash">>), |
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Setup = exml_query:attr(FingerprintEl, <<"setup">>), |
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Fingerprint = exml_query:cdata(FingerprintEl), |
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Transport#{fingerprint => {Hash, Setup, Fingerprint}}; |
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parse_transport_child(#xmlel{name = <<"candidate">>, attrs = Attrs}, |
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#{candidates := Candidates} = Transport) -> |
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NewCandidate = lists:foldl(fun parse_candidate_attr/2, #{}, Attrs), |
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Transport#{candidates := [NewCandidate | Candidates]}; |
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parse_transport_child(_, Transport) -> |
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:-( |
Transport. |
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-spec parse_candidate_attr({binary(), any()}, map()) -> map(). |
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parse_candidate_attr({<<"foundation">>, Val}, Map) -> |
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:-( |
Map#{foundation => Val}; |
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parse_candidate_attr({<<"component">>, Val}, Map) -> |
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:-( |
Map#{component => Val}; |
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parse_candidate_attr({<<"generation">>, Val}, Map) -> |
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:-( |
Map#{generation => Val}; |
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parse_candidate_attr({<<"id">>, Val}, Map) -> |
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:-( |
Map#{id => Val}; |
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parse_candidate_attr({<<"ip">>, Val}, Map) -> |
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:-( |
Map#{ip => Val}; |
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parse_candidate_attr({<<"network">>, Val}, Map) -> |
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:-( |
Map#{network => Val}; |
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parse_candidate_attr({<<"port">>, Val}, Map) -> |
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:-( |
Map#{port => Val}; |
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parse_candidate_attr({<<"priority">>, Val}, Map) -> |
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:-( |
Map#{priority => Val}; |
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parse_candidate_attr({<<"protocol">>, Val}, Map) -> |
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:-( |
Map#{protocol => Val}; |
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parse_candidate_attr({<<"rel-addr">>, Val}, Map) -> |
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:-( |
Map#{raddr => Val}; |
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parse_candidate_attr({<<"rel-port">>, Val}, Map) -> |
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:-( |
Map#{rport => Val}; |
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parse_candidate_attr({<<"tcptype">>, Val}, Map) -> |
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:-( |
Map#{tcptype => Val}; |
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parse_candidate_attr({<<"type">>, Val}, Map) -> |
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:-( |
Map#{type => Val}; |
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parse_candidate_attr(_, Map) -> |
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:-( |
Map. |