Mercurial > libervia-backend
annotate libervia/backend/plugins/plugin_xep_0293.py @ 4294:a0ed5c976bf8 default tip @
component conferences, plugin XEP-0167, XEP-0298: add stream user metadata:
A/V conference now adds user metadata about the stream it is forwarding through XEP-0298.
This is parsed and added to metadata during confirmation on client side.
rel 448
author | Goffi <goffi@goffi.org> |
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date | Tue, 06 Aug 2024 23:43:11 +0200 |
parents | 4b842c1fb686 |
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rev | line source |
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plugin XEP-0293: "Jingle RTP Feedback Negotiation" implementation:
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1 #!/usr/bin/env python3 |
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2 |
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3 # Libervia plugin |
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4 # Copyright (C) 2009-2023 Jérôme Poisson (goffi@goffi.org) |
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5 |
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6 # This program is free software: you can redistribute it and/or modify |
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7 # it under the terms of the GNU Affero General Public License as published by |
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8 # the Free Software Foundation, either version 3 of the License, or |
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9 # (at your option) any later version. |
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10 |
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11 # This program is distributed in the hope that it will be useful, |
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 # GNU Affero General Public License for more details. |
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15 |
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16 # You should have received a copy of the GNU Affero General Public License |
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 |
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19 from typing import List |
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20 |
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21 from twisted.words.protocols.jabber.xmlstream import XMPPHandler |
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22 from twisted.words.xish import domish |
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23 from wokkel import disco, iwokkel |
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24 from zope.interface import implementer |
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25 |
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26 from libervia.backend.core.constants import Const as C |
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27 from libervia.backend.core.i18n import _ |
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28 from libervia.backend.core.log import getLogger |
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29 |
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30 log = getLogger(__name__) |
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31 |
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32 NS_JINGLE_RTP_RTCP_FB = "urn:xmpp:jingle:apps:rtp:rtcp-fb:0" |
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33 |
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34 PLUGIN_INFO = { |
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35 C.PI_NAME: "Jingle RTP Feedback Negotiation", |
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36 C.PI_IMPORT_NAME: "XEP-0293", |
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37 C.PI_TYPE: "XEP", |
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38 C.PI_MODES: C.PLUG_MODE_BOTH, |
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39 C.PI_PROTOCOLS: ["XEP-0293"], |
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40 C.PI_DEPENDENCIES: ["XEP-0092", "XEP-0166", "XEP-0167"], |
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41 C.PI_RECOMMENDATIONS: [], |
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42 C.PI_MAIN: "XEP_0293", |
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43 C.PI_HANDLER: "yes", |
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44 C.PI_DESCRIPTION: _("""Jingle RTP Feedback Negotiation"""), |
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45 } |
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46 |
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47 RTCP_FB_KEY = "rtcp-fb" |
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48 |
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49 |
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50 class XEP_0293: |
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51 def __init__(self, host): |
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52 log.info(f"plugin {PLUGIN_INFO[C.PI_NAME]!r} initialization") |
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53 host.trigger.add("XEP-0167_parse_sdp_a", self._parse_sdp_a_trigger) |
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54 host.trigger.add( |
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55 "XEP-0167_generate_sdp_content", self._generate_sdp_content_trigger |
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56 ) |
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57 host.trigger.add("XEP-0167_parse_description", self._parse_description_trigger) |
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58 host.trigger.add( |
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59 "XEP-0167_parse_description_payload_type", |
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60 self._parse_description_payload_type_trigger, |
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61 ) |
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62 host.trigger.add("XEP-0167_build_description", self._build_description_trigger) |
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63 host.trigger.add( |
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64 "XEP-0167_build_description_payload_type", |
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65 self._build_description_payload_type_trigger, |
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66 ) |
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67 |
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68 def get_handler(self, client): |
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69 return XEP_0293_handler() |
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70 |
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71 ## SDP |
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72 |
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73 def _parse_sdp_a_trigger( |
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74 self, |
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75 attribute: str, |
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76 parts: List[str], |
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77 call_data: dict, |
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78 metadata: dict, |
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79 media_type: str, |
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80 application_data: dict, |
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81 transport_data: dict, |
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82 ) -> None: |
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83 """Parse "rtcp-fb" and "rtcp-fb-trr-int" attributes |
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84 |
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85 @param attribute: The attribute being parsed. |
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86 @param parts: The list of parts in the attribute. |
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87 @param call_data: The call data dict. |
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88 @param metadata: The metadata dict. |
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89 @param media_type: The media type (e.g., audio, video). |
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90 @param application_data: The application data dict. |
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91 @param transport_data: The transport data dict. |
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92 @param payload_map: The payload map dict. |
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93 """ |
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94 if attribute == "rtcp-fb": |
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95 pt_id = parts[0] |
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96 feedback_type = parts[1] |
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97 |
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98 feedback_subtype = None |
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99 parameters = {} |
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100 |
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101 # Check if there are extra parameters |
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102 if len(parts) > 2: |
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103 feedback_subtype = parts[2] |
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104 |
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105 if len(parts) > 3: |
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106 for parameter in parts[3:]: |
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107 name, _, value = parameter.partition("=") |
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108 parameters[name] = value or None |
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109 |
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110 # Check if this feedback is linked to a payload type |
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111 if pt_id == "*": |
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112 # Not linked to a payload type, add to application data |
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113 application_data.setdefault(RTCP_FB_KEY, []).append( |
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114 (feedback_type, feedback_subtype, parameters) |
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115 ) |
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116 else: |
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117 payload_types = application_data.get("payload_types", {}) |
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118 try: |
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119 payload_type = payload_types[int(pt_id)] |
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120 except KeyError: |
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121 log.warning( |
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122 f"Got reference to unknown payload type {pt_id}: " |
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123 f"{' '.join(parts)}" |
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124 ) |
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125 else: |
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126 # Linked to a payload type, add to payload data |
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127 payload_type.setdefault(RTCP_FB_KEY, []).append( |
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128 (feedback_type, feedback_subtype, parameters) |
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129 ) |
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130 |
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131 elif attribute == "rtcp-fb-trr-int": |
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132 pt_id = parts[0] # Payload type ID |
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133 interval = int(parts[1]) |
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134 |
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135 # Check if this interval is linked to a payload type |
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136 if pt_id == "*": |
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137 # Not linked to a payload type, add to application data |
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138 application_data["rtcp-fb-trr-int"] = interval |
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139 else: |
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140 payload_types = application_data.get("payload_types", {}) |
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141 try: |
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142 payload_type = payload_types[int(pt_id)] |
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143 except KeyError: |
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144 log.warning( |
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145 f"Got reference to unknown payload type {pt_id}: " |
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146 f"{' '.join(parts)}" |
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147 ) |
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148 else: |
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149 # Linked to a payload type, add to payload data |
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150 payload_type["rtcp-fb-trr-int"] = interval |
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151 |
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152 def _generate_rtcp_fb_lines( |
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153 self, data: dict, pt_id: str, sdp_lines: List[str] |
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154 ) -> None: |
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155 for type_, subtype, parameters in data.get(RTCP_FB_KEY, []): |
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156 parameters_strs = [ |
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157 f"{k}={v}" if v is not None else k for k, v in parameters.items() |
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158 ] |
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159 parameters_str = " ".join(parameters_strs) |
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160 |
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161 sdp_line = f"a=rtcp-fb:{pt_id} {type_}" |
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162 if subtype: |
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163 sdp_line += f" {subtype}" |
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164 if parameters_str: |
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165 sdp_line += f" {parameters_str}" |
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166 sdp_lines.append(sdp_line) |
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167 |
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168 def _generate_rtcp_fb_trr_int_lines( |
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169 self, data: dict, pt_id: str, sdp_lines: List[str] |
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170 ) -> None: |
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171 if "rtcp-fb-trr-int" not in data: |
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172 return |
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173 sdp_lines.append(f"a=rtcp-fb:{pt_id} trr-int {data['rtcp-fb-trr-int']}") |
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174 |
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175 def _generate_sdp_content_trigger( |
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176 self, |
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177 session: dict, |
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178 local: bool, |
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179 content_name: str, |
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180 content_data: dict, |
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181 sdp_lines: List[str], |
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182 application_data: dict, |
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183 app_data_key: str, |
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184 media_data: dict, |
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185 media: str, |
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186 ) -> None: |
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187 """Generate SDP attributes "rtcp-fb" and "rtcp-fb-trr-int" from application data. |
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188 |
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189 @param session: The session data. |
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190 @param local: Whether this is local or remote content. |
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191 @param content_name: The name of the content. |
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192 @param content_data: The data of the content. |
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193 @param sdp_lines: The list of SDP lines to append to. |
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194 @param application_data: The application data dict. |
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195 @param app_data_key: The key for the application data. |
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196 @param media_data: The media data dict. |
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197 @param media: The media type (e.g., audio, video). |
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198 """ |
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199 # Generate lines for application data |
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200 self._generate_rtcp_fb_lines(application_data, "*", sdp_lines) |
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201 self._generate_rtcp_fb_trr_int_lines(application_data, "*", sdp_lines) |
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202 |
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203 # Generate lines for each payload type |
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204 for pt_id, payload_data in media_data.get("payload_types", {}).items(): |
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205 self._generate_rtcp_fb_lines(payload_data, pt_id, sdp_lines) |
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206 self._generate_rtcp_fb_trr_int_lines(payload_data, pt_id, sdp_lines) |
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207 |
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208 ## XML |
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209 |
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210 def _parse_rtcp_fb_elements(self, parent_elt: domish.Element, data: dict) -> None: |
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211 """Parse the <rtcp-fb> and <rtcp-fb-trr-int> elements. |
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212 |
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213 @param parent_elt: The parent domish.Element. |
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214 @param data: The data dict to populate. |
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215 """ |
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216 for rtcp_fb_elt in parent_elt.elements(NS_JINGLE_RTP_RTCP_FB, "rtcp-fb"): |
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217 try: |
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218 type_ = rtcp_fb_elt["type"] |
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219 subtype = rtcp_fb_elt.getAttribute("subtype") |
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220 |
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221 parameters = {} |
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222 for parameter_elt in rtcp_fb_elt.elements( |
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223 NS_JINGLE_RTP_RTCP_FB, "parameter" |
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224 ): |
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225 parameters[parameter_elt["name"]] = parameter_elt.getAttribute( |
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226 "value" |
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227 ) |
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228 |
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229 data.setdefault(RTCP_FB_KEY, []).append((type_, subtype, parameters)) |
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230 except (KeyError, ValueError) as e: |
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231 log.warning(f"Error while parsing <rtcp-fb>: {e}\n{rtcp_fb_elt.toXml()}") |
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232 |
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233 for rtcp_fb_trr_int_elt in parent_elt.elements( |
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234 NS_JINGLE_RTP_RTCP_FB, "rtcp-fb-trr-int" |
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235 ): |
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236 try: |
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237 interval_value = int(rtcp_fb_trr_int_elt["value"]) |
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238 data.setdefault("rtcp_fb_trr_int", []).append(interval_value) |
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239 except (KeyError, ValueError) as e: |
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240 log.warning( |
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241 f"Error while parsing <rtcp-fb-trr-int>: {e}\n" |
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242 f"{rtcp_fb_trr_int_elt.toXml()}" |
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243 ) |
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244 |
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245 def _parse_description_trigger( |
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246 self, desc_elt: domish.Element, media_data: dict |
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247 ) -> None: |
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248 """Parse the <rtcp-fb> and <rtcp-fb-trr-int> elements from a description. |
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249 |
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250 @param desc_elt: The <description> domish.Element. |
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251 @param media_data: The media data dict to populate. |
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252 """ |
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253 self._parse_rtcp_fb_elements(desc_elt, media_data) |
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254 |
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255 def _parse_description_payload_type_trigger( |
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256 self, |
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257 desc_elt: domish.Element, |
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258 media_data: dict, |
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259 payload_type_elt: domish.Element, |
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260 payload_type_data: dict, |
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261 ) -> None: |
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262 """Parse the <rtcp-fb> and <rtcp-fb-trr-int> elements from a payload type. |
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263 |
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264 @param desc_elt: The <description> domish.Element. |
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265 @param media_data: The media data dict. |
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266 @param payload_type_elt: The <payload-type> domish.Element. |
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267 @param payload_type_data: The payload type data dict to populate. |
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268 """ |
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269 self._parse_rtcp_fb_elements(payload_type_elt, payload_type_data) |
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270 |
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271 def build_rtcp_fb_elements(self, parent_elt: domish.Element, data: dict) -> None: |
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272 """Helper method to build the <rtcp-fb> and <rtcp-fb-trr-int> elements""" |
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273 for type_, subtype, parameters in data.get(RTCP_FB_KEY, []): |
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274 rtcp_fb_elt = parent_elt.addElement((NS_JINGLE_RTP_RTCP_FB, "rtcp-fb")) |
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275 rtcp_fb_elt["type"] = type_ |
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276 if subtype: |
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277 rtcp_fb_elt["subtype"] = subtype |
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278 for name, value in parameters.items(): |
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279 param_elt = rtcp_fb_elt.addElement(name) |
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280 if value is not None: |
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281 param_elt.addContent(str(value)) |
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282 |
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283 if "rtcp-fb-trr-int" in data: |
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284 rtcp_fb_trr_int_elt = parent_elt.addElement( |
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285 (NS_JINGLE_RTP_RTCP_FB, "rtcp-fb-trr-int") |
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286 ) |
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287 rtcp_fb_trr_int_elt["value"] = str(data["rtcp-fb-trr-int"]) |
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288 |
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289 def _build_description_payload_type_trigger( |
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290 self, |
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291 desc_elt: domish.Element, |
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292 media_data: dict, |
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293 payload_type: dict, |
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294 payload_type_elt: domish.Element, |
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295 ) -> None: |
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296 """Build the <rtcp-fb> and <rtcp-fb-trr-int> elements for a payload type""" |
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297 self.build_rtcp_fb_elements(payload_type_elt, payload_type) |
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298 |
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299 def _build_description_trigger( |
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300 self, desc_elt: domish.Element, media_data: dict, session: dict |
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301 ) -> None: |
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302 """Build the <rtcp-fb> and <rtcp-fb-trr-int> elements for a media description""" |
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303 self.build_rtcp_fb_elements(desc_elt, media_data) |
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304 |
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305 |
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306 @implementer(iwokkel.IDisco) |
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307 class XEP_0293_handler(XMPPHandler): |
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308 def getDiscoInfo(self, requestor, target, nodeIdentifier=""): |
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309 return [disco.DiscoFeature(NS_JINGLE_RTP_RTCP_FB)] |
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310 |
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311 def getDiscoItems(self, requestor, target, nodeIdentifier=""): |
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312 return [] |