VorbisRTP: Difference between revisions

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This page documents current consensus on the RTP payload format for Vorbis audio. This encapsulation is useful for interactive and multicast streaming.
This page documents current consensus on the RTP payload format for Vorbis audio. This encapsulation is useful for interactive and multicast streaming.


=== Drafts ===
=== Standard ===


[http://svn.xiph.org/tags/vorbis/libvorbis-1.1.0/doc/draft-kerr-avt-vorbis-rtp-03.txt draft-kerr-avt-vorbis-rtp-03] (now expired) was the last spec attempt and serves as the baseline for current work.
In 2008, the Vorbis RTP specification was accepted by the IETF's Network Working Group as RFC 5215. It may be found at
 
*[http://tools.ietf.org/rfc/rfc5215.txt rfc5215.txt]
Version 04 of the draft is being written using the XML markup defined in [http://xml.resource.org/public/rfc/html/rfc2629.html RFC2629]. Text and HTML versions of the current draft state are available here:
*[http://xiph.org/vorbis/doc/rfc5215.xml rfc5215.xml]
 
* [http://www.j-ogg.de/rfc/vorbis-rtp.txt draft-kerr-avt-vorbis-rtp-04.txt]
* [http://www.j-ogg.de/rfc/vorbis-rtp.html draft-kerr-avt-vorbis-rtp-04.html]


=== Issues ===
=== Issues ===


Basically, we pack Vorbis packets into RTP packets; that's been part of the draft for some time. The hard part is achieving reliable header transmission, since RTP is usually used in combination with a no-guaranteed-delivery networking mechanism. Equally important, in multicast the headers can't be prepended on connection the way icecast does with HTTP streams.
Basically, we pack Vorbis packets into RTP packets; that's been part of the draft for some time. The hard part is achieving reliable header transmission, since RTP is usually used in combination with a no-guaranteed-delivery networking mechanism. Equally important, in multicast the headers can't be prepended on connection the way Icecast does with HTTP streams.


The current suggestion (due to Jack) is that we dispense with the chaining feature of Ogg streams, and only allow a single set of vorbis headers per RTP stream. Since RTP is most often used to stream live or at least individual events, this is not a serious limitation. Even in the "simulated live" case encoded files often have the same set of codebooks, and those that do not can be re-encoded on the fly.
The current suggestion (due to Jack) is that we dispense with the chaining feature of Ogg streams, and only allow a single set of vorbis headers per RTP stream. Since RTP is most often used to stream live or at least individual events, this is not a serious limitation. Even in the "simulated live" case encoded files often have the same set of codebooks, and those that do not can be re-encoded on the fly.
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=== Implementation ===
=== Implementation ===


Tor-Einar Jarnbjo has an [http://www.j-ogg.de/rtp/index.html example implementation] that extends the ideas in the 03 draft a bit.
Tor-Einar Jarnbjo has an [http://www.j-ogg.de/rtp/index.html example implementation] that extends the ideas in the kerr 03 draft a bit.
[http://www.shop263.com/i-49/339.htm 抗氧剂]
 
[http://www.shop263.com/i-49/340.htm MA潮湿水下固化剂]
[[Category:Vorbis]]
[http://www.shop263.com/i-49/341.htm NVP]
[http://www.shop263.com/i-49/342.htm PAE湿强剂]
[http://www.shop263.com/i-49/343.htm PVC粉]
[http://www.shop263.com/i-49/344.htm PVC热稳定剂]
[http://www.shop263.com/i-49/345.htm PVC乳化树脂安定剂]
[http://www.shop263.com/i-49/346.htm PVC助粉]
[http://www.shop263.com/i-49/347.htm SCD硬脂酸钙润滑剂]
[http://www.shop263.com/i-49/348.htm 安息香]
[http://www.shop263.com/i-49/349.htm 氨基苯磺酸]
[http://www.shop263.com/i-49/350.htm 氨基官能团硅烷]
[http://www.shop263.com/i-49/351.htm 氨基硅烷]
[http://www.shop263.com/i-49/352.htm 氨基硅油原油]
[http://www.shop263.com/i-49/353.htm 氨基磺酸盐系]
[http://www.shop263.com/i-49/354.htm 氨基甲酸酯]
[http://www.shop263.com/i-49/355.htm 氨基树脂]
[http://www.shop263.com/i-49/356.htm 氨基酸]
[http://www.shop263.com/i-49/357.htm 凹印溶剂]
[http://www.shop263.com/i-49/358.htm 八钼酸铵]
[http://www.shop263.com/i-49/359.htm 白底防污剂]
[http://www.shop263.com/i-49/360.htm 白石蜡油]
[http://www.shop263.com/i-49/361.htm 白炭黑]
[http://www.shop263.com/i-49/362.htm 半胱氨酸]
[http://www.shop263.com/i-49/363.htm 半精炼石蜡]
[http://www.shop263.com/i-49/364.htm 半永久性脱模剂]
[http://www.shop263.com/i-49/365.htm 包膜过碳酸钠]
[http://www.shop263.com/i-49/366.htm 宝丽板]
[http://www.shop263.com/i-49/367.htm 钡镉锌系液体安定剂]
[http://www.shop263.com/i-49/368.htm 钡锌系液体安定剂]
[http://www.shop263.com/i-49/369.htm 苯胺催化剂]
[http://www.shop263.com/i-49/370.htm 苯胺黑]
[http://www.shop263.com/i-49/371.htm 苯丙氨酸]
[http://www.shop263.com/i-49/372.htm 苯酚磺酸及其钠盐]
[http://www.shop263.com/i-49/373.htm 苯苷]
[http://www.shop263.com/i-49/374.htm 苯酐]
[http://www.shop263.com/i-49/375.htm 苯甲基硅油]
[http://www.shop263.com/i-49/376.htm 苯偶酰]
[http://www.shop263.com/i-49/377.htm 苯偶姻]
[http://www.shop263.com/i-49/378.htm 苯骈三氮唑]
[http://www.shop263.com/i-49/379.htm 苯氧基四溴双酚]
[http://www.shop263.com/i-49/380.htm 苯乙烯]
[http://www.shop263.com/i-49/381.htm 苯乙烯脱氢催化剂]
[http://www.shop263.com/i-49/382.htm 泵送剂]
[http://www.shop263.com/i-49/383.htm 吡效隆可溶性液剂]
[http://www.shop263.com/i-49/384.htm 必性硅油]
[http://www.shop263.com/i-49/385.htm 苄胺]
[http://www.shop263.com/i-49/386.htm 苄基苯胺]
[http://www.shop263.com/i-49/387.htm 变换催化剂]
[http://www.shop263.com/i-49/388.htm 变色硅胶]
[http://www.shop263.com/i-49/389.htm 变性淀粉]
[http://www.shop263.com/i-49/390.htm 表调剂]
[http://www.shop263.com/i-49/391.htm 表面处理剂]
[http://www.shop263.com/i-49/392.htm 表面活性剂]
[http://www.shop263.com/i-49/393.htm 表面施胶剂]
[http://www.shop263.com/i-49/394.htm 冰醋酸]
[http://www.shop263.com/i-49/395.htm 冰晶石]
[http://www.shop263.com/i-49/396.htm 丙苯胶乳]
[http://www.shop263.com/i-49/397.htm 丙二醇]
[http://www.shop263.com/i-49/398.htm 丙二醇醚]
[http://www.shop263.com/i-49/399.htm 丙基碱]
[http://www.shop263.com/i-49/400.htm 丙基甜菜碱]
[http://www.shop263.com/i-49/401.htm 丙酸丁酯]
[http://www.shop263.com/i-49/402.htm 丙酸乙酯]
[http://www.shop263.com/i-49/403.htm 丙酮]
[http://www.shop263.com/i-49/404.htm 丙酮酸]
[http://www.shop263.com/i-49/405.htm 丙烯酸]
[http://www.shop263.com/i-49/406.htm 丙烯酸玻璃胶]
[http://www.shop263.com/i-49/407.htm 丙烯酸丁酯]
[http://www.shop263.com/i-49/408.htm 丙烯酸甲酯]
[http://www.shop263.com/i-49/409.htm 丙烯酸乳液]
[http://www.shop263.com/i-49/410.htm 丙烯酸树脂]
[http://www.shop263.com/i-49/411.htm 丙烯酸乙酯]
[http://www.shop263.com/i-49/412.htm 丙烯酸异辛酯]
[http://www.shop263.com/i-49/413.htm 丙烯酸酯建筑密封膏]
[http://www.shop263.com/i-49/414.htm 丙烯酸酯粘合剂]
[http://www.shop263.com/i-49/415.htm 丙烯酰胺]
[http://www.shop263.com/i-49/416.htm 丙橡胶]
[http://www.shop263.com/i-49/417.htm 玻璃清洁防雾剂]
[http://www.shop263.com/i-49/418.htm 剥离剂]
[http://www.shop263.com/i-49/419.htm 不饱和聚酯树酯]
[http://www.shop263.com/i-49/420.htm 不起烘枪水]
[http://www.shop263.com/i-49/421.htm 布边糊]
[http://www.shop263.com/i-49/422.htm 彩色松散剂]
[http://www.shop263.com/i-49/423.htm 彩砖保色光亮剂]
[http://www.shop263.com/i-49/424.htm 草甘膦]
[http://www.shop263.com/i-49/425.htm 草酸]
[http://www.shop263.com/i-49/426.htm 柴油低温流动性改进剂]
[http://www.shop263.com/i-49/427.htm 柴油多效清净剂]
[http://www.shop263.com/i-49/428.htm 柴油降凝剂]
[http://www.shop263.com/i-49/429.htm 柴油抗乳化剂]
[http://www.shop263.com/i-49/430.htm 柴油流动改进剂]
[http://www.shop263.com/i-49/431.htm 柴油清净分散剂]
[http://www.shop263.com/i-49/432.htm 柴油清净剂]
[http://www.shop263.com/i-49/433.htm 长效气雾杀虫剂]
[http://www.shop263.com/i-49/434.htm 常温发黑剂]
[http://www.shop263.com/i-49/435.htm 超细]
[http://www.shop263.com/i-49/436.htm 超细粉碎]
[http://www.shop263.com/i-49/437.htm 超细硬质煅烧高岭土]
[http://www.shop263.com/i-49/438.htm 超細竹炭粉體]
[http://www.shop263.com/i-49/439.htm 成核剂]
[http://www.shop263.com/i-49/440.htm 成膜助剂]
[http://www.shop263.com/i-49/441.htm 齿轮油]
[http://www.shop263.com/i-49/442.htm 除草剂]
[http://www.shop263.com/i-49/443.htm 除垢剂]
[http://www.shop263.com/i-49/444.htm 除灰防腐增效剂]
[http://www.shop263.com/i-49/445.htm 除味袋]
[http://www.shop263.com/i-49/446.htm 除锈]
[http://www.shop263.com/i-49/447.htm 除锈剂]
[http://www.shop263.com/i-49/448.htm 除氧防腐剂]
[http://www.shop263.com/i-49/449.htm 除油剂]
[http://www.shop263.com/i-49/450.htm 除油锈剂]
[http://www.shop263.com/i-49/451.htm 除渣清焦剂]
[http://www.shop263.com/i-49/452.htm 触媒]
[http://www.shop263.com/i-49/453.htm 纯碱]
[http://www.shop263.com/i-49/454.htm 醇酸树脂]
[http://www.shop263.com/i-49/455.htm 瓷球]
[http://www.shop263.com/i-49/456.htm 瓷砂]
[http://www.shop263.com/i-49/457.htm 瓷柱]
[http://www.shop263.com/i-49/458.htm 瓷砖地板洁亮护理剂]
[http://www.shop263.com/i-49/459.htm 磁铁矿]
[http://www.shop263.com/i-49/460.htm 促进剂]
[http://www.shop263.com/i-49/461.htm 醋酸]
[http://www.shop263.com/i-49/462.htm 醋酸丁酯]
[http://www.shop263.com/i-49/463.htm 醋酸甘油酯]
[http://www.shop263.com/i-49/464.htm 醋酸辛酯]
[http://www.shop263.com/i-49/465.htm 醋酸乙烯]
[http://www.shop263.com/i-49/466.htm 醋酸乙酯]
[http://www.shop263.com/i-49/467.htm 醋酸异辛酯]
[http://www.shop263.com/i-49/468.htm 醋酸酯]
[http://www.shop263.com/i-49/469.htm 醋纤助剂]
[http://www.shop263.com/i-49/470.htm 催化剂]
[http://www.shop263.com/i-49/471.htm 淬火油]
[http://www.shop263.com/i-49/472.htm 大包装优级化学试剂]
[http://www.shop263.com/i-49/473.htm 大环硝基物]
[http://www.shop263.com/i-49/474.htm 大理石粉]
[http://www.shop263.com/i-49/475.htm 带锈擦拭磷化液]
[http://www.shop263.com/i-49/476.htm 单宁酸脂]
[http://www.shop263.com/i-49/477.htm 弹性涂料]
[http://www.shop263.com/i-49/478.htm 氮气]
[http://www.shop263.com/i-49/479.htm 氮酮促进剂系列]
[http://www.shop263.com/i-49/480.htm 导气管]
[http://www.shop263.com/i-49/481.htm 导热硅]
[http://www.shop263.com/i-49/482.htm 导热油在线清洗剂]
[http://www.shop263.com/i-49/483.htm 导热油增寿剂]
[http://www.shop263.com/i-49/484.htm 低芳溶剂油]
[http://www.shop263.com/i-49/485.htm 低芳三线油]
[http://www.shop263.com/i-49/486.htm 低硫低芳烃铝板]
[http://www.shop263.com/i-49/487.htm 低浓高效减水剂]
[http://www.shop263.com/i-49/488.htm 低温涤纶增白剂]
[http://www.shop263.com/i-49/489.htm 低温固化剂]
[http://www.shop263.com/i-49/490.htm 低压合成甲醇催化剂]
[http://www.shop263.com/i-49/491.htm 涤纶荧光增白剂]
[http://www.shop263.com/i-49/492.htm 电镀光亮剂]
[http://www.shop263.com/i-49/493.htm 电镀化工原料]
[http://www.shop263.com/i-49/494.htm 电镀特殊化学品]
[http://www.shop263.com/i-49/495.htm 电镀添加剂]
[http://www.shop263.com/i-49/496.htm 电镀原料]
[http://www.shop263.com/i-49/497.htm 电镀中间体]
[http://www.shop263.com/i-49/498.htm 电镀助剂]
[http://www.shop263.com/i-49/499.htm 电加热反应釜专用导热油]
[http://www.shop263.com/i-49/500.htm 电炉炭块]
[http://www.shop263.com/i-49/501.htm 电子原料]
[http://www.shop263.com/i-49/502.htm 丁二醇二丙酸酯]
[http://www.shop263.com/i-49/503.htm 丁酮]
[http://www.shop263.com/i-49/504.htm 毒重石矿粉]
[http://www.shop263.com/i-49/505.htm 度羧甲基纤维素]
[http://www.shop263.com/i-49/506.htm 对苯二甲酰氯]
[http://www.shop263.com/i-49/507.htm 对甲氧基苄胺]
[http://www.shop263.com/i-49/508.htm 对羟基苯甘氨酸]
[http://www.shop263.com/i-49/509.htm 对羟基苯海因]
[http://www.shop263.com/i-49/510.htm 对乙酰氨基环己醇]
[http://www.shop263.com/i-49/511.htm 钝化剂]
[http://www.shop263.com/i-49/512.htm 钝化液]
[http://www.shop263.com/i-49/513.htm 多聚甲醛]
[http://www.shop263.com/i-49/514.htm 多元涂布变性淀粉]
[http://www.shop263.com/i-49/515.htm 二苯砜]
[http://www.shop263.com/i-49/516.htm 二丁酯]
[http://www.shop263.com/i-49/517.htm 二甲氨基苯甲醛]
[http://www.shop263.com/i-49/518.htm 二甲氨基甲酰氯]
[http://www.shop263.com/i-49/519.htm 二甲基二硫]
[http://www.shop263.com/i-49/520.htm 二甲基二氯化锡]
[http://www.shop263.com/i-49/521.htm 二甲基硅油]
[http://www.shop263.com/i-49/522.htm 二甲基乙醉胺]
[http://www.shop263.com/i-49/523.htm 二甲氧基苯甲醇]
[http://www.shop263.com/i-49/524.htm 二甲酯]
[http://www.shop263.com/i-49/525.htm 二氯水杨酸]
[http://www.shop263.com/i-49/526.htm 二氯异氰尿酸钠]
[http://www.shop263.com/i-49/527.htm 二茂铁]
[http://www.shop263.com/i-49/528.htm 二茂铁衍生物]
[http://www.shop263.com/i-49/529.htm 二羧酸二苯醚]
[http://www.shop263.com/i-49/530.htm 二溴]
[http://www.shop263.com/i-49/531.htm 二溴丙氧基]
[http://www.shop263.com/i-49/532.htm 二盐基亚磷酸铅]
[http://www.shop263.com/i-49/533.htm 二氧丙烷]
[http://www.shop263.com/i-49/534.htm 二氧化硅]
[http://www.shop263.com/i-49/535.htm 二氧化碳]
[http://www.shop263.com/i-49/536.htm 二氧六环]
[http://www.shop263.com/i-49/537.htm 二乙基苯]
[http://www.shop263.com/i-49/538.htm 二异丁酯]
[http://www.shop263.com/i-49/539.htm 二元醇醚]
[http://www.shop263.com/i-49/540.htm 发动机防冻防沸液]
[http://www.shop263.com/i-49/541.htm 发酵用消泡剂]
[http://www.shop263.com/i-49/542.htm 发泡安定剂]
[http://www.shop263.com/i-49/543.htm 发泡调节剂]
[http://www.shop263.com/i-49/544.htm 发泡剂]
[http://www.shop263.com/i-49/545.htm 钒触媒]
[http://www.shop263.com/i-49/546.htm 泛醇]
[http://www.shop263.com/i-49/547.htm 泛用塑料]
[http://www.shop263.com/i-49/548.htm 方解石粉]
[http://www.shop263.com/i-49/549.htm 芳烃溶剂油]
[http://www.shop263.com/i-49/550.htm 防冻剂]
[http://www.shop263.com/i-49/551.htm 防冻液]
[http://www.shop263.com/i-49/552.htm 防毒口罩]
[http://www.shop263.com/i-49/553.htm 防毒面罩]
[http://www.shop263.com/i-49/554.htm 防腐防霉杀菌剂]
[http://www.shop263.com/i-49/555.htm 防护用炭]
[http://www.shop263.com/i-49/556.htm 防火堵料]
[http://www.shop263.com/i-49/557.htm 防老剂]
[http://www.shop263.com/i-49/558.htm 防漏堵漏剂]
[http://www.shop263.com/i-49/559.htm 防霉剂]
[http://www.shop263.com/i-49/560.htm 防霉抗菌剂]
[http://www.shop263.com/i-49/561.htm 防染盐]
[http://www.shop263.com/i-49/562.htm 防鼠忌避剂]
[http://www.shop263.com/i-49/563.htm 防水剂]
[http://www.shop263.com/i-49/564.htm 防水油]
[http://www.shop263.com/i-49/565.htm 防锈剂]
[http://www.shop263.com/i-49/566.htm 防锈漆]
[http://www.shop263.com/i-49/567.htm 防锈水]
[http://www.shop263.com/i-49/568.htm 防锈油]
[http://www.shop263.com/i-49/569.htm 防锈油系列]
[http://www.shop263.com/i-49/570.htm 防粘釜剂]
[http://www.shop263.com/i-49/571.htm 纺丝油剂]
[http://www.shop263.com/i-49/572.htm 纺织化学品]
[http://www.shop263.com/i-49/573.htm 纺织浆料类]
[http://www.shop263.com/i-49/574.htm 纺织品]
[http://www.shop263.com/i-49/575.htm 纺织染料]
[http://www.shop263.com/i-49/576.htm 纺织印染化工原料]
[http://www.shop263.com/i-49/577.htm 纺织印染助剂]
[http://www.shop263.com/i-49/578.htm 纺织用油]
[http://www.shop263.com/i-49/579.htm 纺织助剂]
[http://www.shop263.com/i-49/580.htm 非离子表面活性剂]
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[http://www.shop263.com/i-49/911.htm 聚氧乙烯山梨醇]
[http://www.shop263.com/i-49/912.htm 聚乙二醇]
[http://www.shop263.com/i-49/913.htm 聚乙烯]
[http://www.shop263.com/i-49/914.htm 聚乙烯醇]
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[http://www.shop263.com/i-49/916.htm 聚乙烯蜡]
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[http://www.shop263.com/i-49/923.htm 聚酯树脂]
[http://www.shop263.com/i-49/924.htm 绝缘硅脂]
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[http://www.shop263.com/i-49/940.htm 抗裂防水剂]
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[http://www.shop263.com/i-49/973.htm 邻甲基对苯二酚]
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[http://www.shop263.com/i-49/1005.htm 铝合金清洗剂]
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[http://www.shop263.com/i-49/1011.htm 氯吡脲]
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[http://www.shop263.com/i-49/1014.htm 氯丙基三乙氧基硅烷]
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Latest revision as of 10:59, 19 February 2016

Vorbis over RTP

This page documents current consensus on the RTP payload format for Vorbis audio. This encapsulation is useful for interactive and multicast streaming.

Standard

In 2008, the Vorbis RTP specification was accepted by the IETF's Network Working Group as RFC 5215. It may be found at

Issues

Basically, we pack Vorbis packets into RTP packets; that's been part of the draft for some time. The hard part is achieving reliable header transmission, since RTP is usually used in combination with a no-guaranteed-delivery networking mechanism. Equally important, in multicast the headers can't be prepended on connection the way Icecast does with HTTP streams.

The current suggestion (due to Jack) is that we dispense with the chaining feature of Ogg streams, and only allow a single set of vorbis headers per RTP stream. Since RTP is most often used to stream live or at least individual events, this is not a serious limitation. Even in the "simulated live" case encoded files often have the same set of codebooks, and those that do not can be re-encoded on the fly.

The only real drawback is the loss of a metadata update mechanism. This can be resolved either by using a completely separate metadata stream (which we've always wanted to do anyway) or by altering the spec to allow comment header packets to occur outside the headers. In the later case a recording application would need to insert chaining boundaries and duplicate headers at each metadata change. The former offers the client more control over the metadata stream bandwidth.

Design

  • Vorbis packets get packed into RTP packets
  • Header parameters are fixed per stream, so they can be passed in the SDP
 * inline in the SDP?
 * HTTP reference or other protocol?
 * some kind of hash so clients can cache codebooks/parameters
 * inline in the RTP stream should also be allowed
  • Granulepos becomes timestamp (still in samples)

Implementation

Tor-Einar Jarnbjo has an example implementation that extends the ideas in the kerr 03 draft a bit.

Retrieved from "https://wiki.xiph.org/index.php?title=VorbisRTP&oldid=16292"