VorbisRTP

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Contents

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.

Drafts

draft-kerr-avt-vorbis-rtp-03 (now expired) was the last spec attempt and serves as the baseline for current work.

Version 04 of the draft is being written using the XML markup defined in RFC2629. Text and HTML versions of the current draft state are available here:

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 03 draft a bit. 抗氧剂 MA潮湿水下固化剂 NVP PAE湿强剂 PVC粉 PVC热稳定剂 PVC乳化树脂安定剂 PVC助粉 SCD硬脂酸钙润滑剂 安息香 氨基苯磺酸 氨基官能团硅烷 氨基硅烷 氨基硅油原油 氨基磺酸盐系 氨基甲酸酯 氨基树脂 氨基酸 凹印溶剂 八钼酸铵 白底防污剂 白石蜡油 白炭黑 半胱氨酸 半精炼石蜡 半永久性脱模剂 包膜过碳酸钠 宝丽板 钡镉锌系液体安定剂 钡锌系液体安定剂 苯胺催化剂 苯胺黑 苯丙氨酸 苯酚磺酸及其钠盐 苯苷 苯酐 苯甲基硅油 苯偶酰 苯偶姻 苯骈三氮唑 苯氧基四溴双酚 苯乙烯 苯乙烯脱氢催化剂 泵送剂 吡效隆可溶性液剂 必性硅油 苄胺 苄基苯胺 变换催化剂 变色硅胶 变性淀粉 表调剂 表面处理剂 表面活性剂 表面施胶剂 冰醋酸 冰晶石 丙苯胶乳 丙二醇 丙二醇醚 丙基碱 丙基甜菜碱 丙酸丁酯 丙酸乙酯 丙酮 丙酮酸 丙烯酸 丙烯酸玻璃胶 丙烯酸丁酯 丙烯酸甲酯 丙烯酸乳液 丙烯酸树脂 丙烯酸乙酯 丙烯酸异辛酯 丙烯酸酯建筑密封膏 丙烯酸酯粘合剂 丙烯酰胺 丙橡胶 玻璃清洁防雾剂 剥离剂 不饱和聚酯树酯 不起烘枪水 布边糊 彩色松散剂 彩砖保色光亮剂 草甘膦 草酸 柴油低温流动性改进剂 柴油多效清净剂 柴油降凝剂 柴油抗乳化剂 柴油流动改进剂 柴油清净分散剂 柴油清净剂 长效气雾杀虫剂 常温发黑剂 超细 超细粉碎 超细硬质煅烧高岭土 超細竹炭粉體 成核剂 成膜助剂 齿轮油 除草剂 除垢剂 除灰防腐增效剂 除味袋 除锈 除锈剂 除氧防腐剂 除油剂 除油锈剂 除渣清焦剂 触媒 纯碱 醇酸树脂 瓷球 瓷砂 瓷柱 瓷砖地板洁亮护理剂 磁铁矿 促进剂 醋酸 醋酸丁酯 醋酸甘油酯 醋酸辛酯 醋酸乙烯 醋酸乙酯 醋酸异辛酯 醋酸酯 醋纤助剂 催化剂 淬火油 大包装优级化学试剂 大环硝基物 大理石粉 带锈擦拭磷化液 单宁酸脂 弹性涂料 氮气 氮酮促进剂系列 导气管 导热硅 导热油在线清洗剂 导热油增寿剂 低芳溶剂油 低芳三线油 低硫低芳烃铝板 低浓高效减水剂 低温涤纶增白剂 低温固化剂 低压合成甲醇催化剂 涤纶荧光增白剂 电镀光亮剂 电镀化工原料 电镀特殊化学品 电镀添加剂 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