Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 | 1x 1x 1x 1x 1x 1x 49x 49x 49x 49x 51x 51x 2x 49x 49x 49x 1x | /**
* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2022, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*/
import FactoryMaker from '../../core/FactoryMaker.js';
import EventBus from '../../core/EventBus.js';
import Events from '../../core/events/Events.js';
import Debug from '../../core/Debug.js';
import { CMSD_DYNAMIC } from '@svta/common-media-library/cmsd/CMSD_DYNAMIC.js';
import { CMSD_STATIC } from '@svta/common-media-library/cmsd/CMSD_STATIC.js';
import { CmsdObjectType } from '@svta/common-media-library/cmsd/CmsdObjectType.js';
import { decodeCmsdDynamic } from '@svta/common-media-library/cmsd/decodeCmsdDynamic.js';
import { decodeCmsdStatic } from '@svta/common-media-library/cmsd/decodeCmsdStatic.js';
// Note: in modern browsers, the header names are returned in all lower case
const CMSD_STATIC_RESPONSE_FIELD_NAME = CMSD_STATIC.toLowerCase();
const CMSD_DYNAMIC_RESPONSE_FIELD_NAME = CMSD_DYNAMIC.toLowerCase();
const CMSD_KEYS = {
AVAILABILITY_TIME: 'at',
DURESS: 'du',
ENCODED_BITRATE: 'br',
ESTIMATED_THROUGHPUT: 'etp',
HELD_TIME: 'ht',
INTERMEDIARY_IDENTIFIER: 'n',
MAX_SUGGESTED_BITRATE: 'mb',
NEXT_OBJECT_RESPONSE: 'nor',
NEXT_RANGE_RESPONSE: 'nrr',
OBJECT_DURATION: 'd',
OBJECT_TYPE: 'ot',
RESPONSE_DELAY: 'rd',
ROUND_TRIP_TIME: 'rtt',
STARTUP: 'su',
STREAM_TYPE: 'st',
STREAMING_FORMAT: 'sf',
VERSION: 'v'
}
const PERSISTENT_PARAMS = [
CMSD_KEYS.MAX_SUGGESTED_BITRATE,
CMSD_KEYS.STREAM_TYPE,
CMSD_KEYS.STREAMING_FORMAT,
CMSD_KEYS.VERSION
];
const STREAM = 'stream'
const MEDIATYPE_TO_OBJECTTYPE = {
'video': CmsdObjectType.VIDEO,
'audio': CmsdObjectType.AUDIO,
'text': CmsdObjectType.TIMED_TEXT,
'stream': STREAM // Specific value for parameters without object type, which apply for all media/objects
}
function CmsdModel() {
const context = this.context;
const eventBus = EventBus(context).getInstance();
let instance,
logger,
_staticParamsDict,
_dynamicParamsDict;
function setup() {
logger = Debug(context).getInstance().getLogger(instance);
_resetInitialSettings();
}
function initialize() {}
function setConfig(/*config*/) {}
function _resetInitialSettings() {
_staticParamsDict = {};
_dynamicParamsDict = {};
}
function _clearParams(params) {
if (!params) {
return;
}
Object.keys(params).forEach(key => {
if (!PERSISTENT_PARAMS.includes(key)) {
delete params[key];
}
})
}
function _parseCMSDStatic(value) {
try {
return decodeCmsdStatic(value);
} catch (e) {
logger.error('Failed to parse CMSD-Static response header value:', e);
}
}
function _parseCMSDDynamic(value) {
try {
const items = decodeCmsdDynamic(value);
const last = items[items.length - 1];
return last?.params || {};
} catch (e) {
logger.error('Failed to parse CMSD-Dynamic response header value:', e);
return {};
}
}
function _mediaTypetoObjectType(mediaType) {
return MEDIATYPE_TO_OBJECTTYPE[mediaType] || CmsdObjectType.OTHER;
}
function _getParamValueForObjectType(paramsType, ot, key) {
const params = paramsType === CMSD_STATIC ? _staticParamsDict : _dynamicParamsDict;
const otParams = params[ot] || {};
const streamParams = params[STREAM] || {};
const value = otParams[key] || streamParams[key];
return value;
}
function parseResponseHeaders(responseHeaders, mediaType) {
let staticParams = null;
let dynamicParams = null;
// Note: responseHeaders as a record of key:value
for (const key in responseHeaders) {
const value = responseHeaders[key];
switch (key) {
case CMSD_STATIC_RESPONSE_FIELD_NAME:
staticParams = _parseCMSDStatic(value);
eventBus.trigger(Events.CMSD_STATIC_HEADER, staticParams);
break;
case CMSD_DYNAMIC_RESPONSE_FIELD_NAME:
if (!dynamicParams) {
dynamicParams = _parseCMSDDynamic(value);
}
break;
default:
break;
}
}
// Get object type
let ot = STREAM;
if (staticParams && staticParams[CMSD_KEYS.OBJECT_TYPE]) {
ot = staticParams[CMSD_KEYS.OBJECT_TYPE];
} else if (mediaType) {
ot = _mediaTypetoObjectType(mediaType)
}
// Clear previously received params except persistent ones
_clearParams(_staticParamsDict[ot]);
_clearParams(_dynamicParamsDict[ot]);
// Merge params with previously received params
if (staticParams) {
_staticParamsDict[ot] = Object.assign(_staticParamsDict[ot] || {}, staticParams);
}
if (dynamicParams) {
_dynamicParamsDict[ot] = Object.assign(_dynamicParamsDict[ot] || {}, dynamicParams);
}
return {
static: staticParams,
dynamic: dynamicParams
}
}
function getMaxBitrate(type) {
let ot = _mediaTypetoObjectType(type);
let mb = _getParamValueForObjectType(CMSD_DYNAMIC, ot, CMSD_KEYS.MAX_SUGGESTED_BITRATE);
return mb ? mb : -1
}
function getEstimatedThroughput(type) {
let ot = _mediaTypetoObjectType(type);
let etp = _getParamValueForObjectType(CMSD_DYNAMIC, ot, CMSD_KEYS.ESTIMATED_THROUGHPUT);
return etp ? etp : null
}
function getResponseDelay(type) {
let ot = _mediaTypetoObjectType(type);
let rd = _getParamValueForObjectType(CMSD_DYNAMIC, ot, CMSD_KEYS.RESPONSE_DELAY);
return rd ? rd : null
}
function getRoundTripTime(type) {
let ot = _mediaTypetoObjectType(type);
let rd = _getParamValueForObjectType(CMSD_DYNAMIC, ot, CMSD_KEYS.ROUND_TRIP_TIME);
return rd ? rd : null
}
function reset() {
_resetInitialSettings();
}
instance = {
setConfig,
initialize,
reset,
parseResponseHeaders,
getMaxBitrate,
getEstimatedThroughput,
getResponseDelay,
getRoundTripTime,
};
setup();
return instance;
}
CmsdModel.__dashjs_factory_name = 'CmsdModel';
export default FactoryMaker.getSingletonFactory(CmsdModel);
|