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| 4 |
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| 6 |
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| 7 | Network Working Group I. Goncalves
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| 8 | Request for Comments: 5334 S. Pfeiffer
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| 9 | Obsoletes: 3534 C. Montgomery
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| 10 | Category: Standards Track Xiph
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| 11 | September 2008
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| 12 |
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| 13 |
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| 14 | Ogg Media Types
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| 15 |
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| 16 | Status of This Memo
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| 17 |
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| 18 | This document specifies an Internet standards track protocol for the
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| 19 | Internet community, and requests discussion and suggestions for
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| 20 | improvements. Please refer to the current edition of the "Internet
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| 21 | Official Protocol Standards" (STD 1) for the standardization state
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| 22 | and status of this protocol. Distribution of this memo is unlimited.
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| 23 |
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| 24 | Abstract
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| 25 |
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| 26 | This document describes the registration of media types for the Ogg
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| 27 | container format and conformance requirements for implementations of
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| 28 | these types. This document obsoletes RFC 3534.
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| 29 |
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| 30 | Table of Contents
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| 31 |
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| 32 | 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 2
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| 33 | 2. Changes Since RFC 3534 . . . . . . . . . . . . . . . . . . 2
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| 34 | 3. Conformance and Document Conventions . . . . . . . . . . . 3
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| 35 | 4. Deployed Media Types and Compatibility . . . . . . . . . . 3
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| 36 | 5. Relation between the Media Types . . . . . . . . . . . . . 5
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| 37 | 6. Encoding Considerations . . . . . . . . . . . . . . . . . . 5
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| 38 | 7. Security Considerations . . . . . . . . . . . . . . . . . . 6
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| 39 | 8. Interoperability Considerations . . . . . . . . . . . . . . 7
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| 40 | 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . 7
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| 41 | 10. Ogg Media Types . . . . . . . . . . . . . . . . . . . . . . 7
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| 42 | 10.1. application/ogg . . . . . . . . . . . . . . . . . . . . . . 7
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| 43 | 10.2. video/ogg . . . . . . . . . . . . . . . . . . . . . . . . . 8
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| 44 | 10.3. audio/ogg . . . . . . . . . . . . . . . . . . . . . . . . . 9
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| 45 | 11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . 10
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| 46 | 12. Copying Conditions . . . . . . . . . . . . . . . . . . . . 10
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| 47 | 13. References . . . . . . . . . . . . . . . . . . . . . . . . 11
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| 48 | 13.1. Normative References . . . . . . . . . . . . . . . . . . . 11
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| 49 | 13.2. Informative References . . . . . . . . . . . . . . . . . . 11
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| 50 |
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| 51 |
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| 52 |
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| 53 |
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| 54 |
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| 55 |
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| 56 |
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| 57 |
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| 58 | Goncalves, et al. Standards Track [Page 1]
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| 59 | |
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| 60 |
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| 61 | RFC 5334 Ogg Media Types September 2008
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| 62 |
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| 63 |
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| 64 | 1. Introduction
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| 65 |
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| 66 | This document describes media types for Ogg, a data encapsulation
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| 67 | format defined by the Xiph.Org Foundation for public use. Refer to
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| 68 | "Introduction" in [RFC3533] and "Overview" in [Ogg] for background
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| 69 | information on this container format.
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| 70 |
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| 71 | Binary data contained in Ogg, such as Vorbis and Theora, has
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| 72 | historically been interchanged using the application/ogg media type
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| 73 | as defined by [RFC3534]. This document obsoletes [RFC3534] and
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| 74 | defines three media types for different types of content in Ogg to
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| 75 | reflect this usage in the IANA media type registry, to foster
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| 76 | interoperability by defining underspecified aspects, and to provide
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| 77 | general security considerations.
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| 78 |
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| 79 | The Ogg container format is known to contain [Theora] or [Dirac]
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| 80 | video, [Speex] (narrow-band and wide-band) speech, [Vorbis] or [FLAC]
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| 81 | audio, and [CMML] timed text/metadata. As Ogg encapsulates binary
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| 82 | data, it is possible to include any other type of video, audio,
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| 83 | image, text, or, generally speaking, any time-continuously sampled
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| 84 | data.
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| 85 |
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| 86 | While raw packets from these data sources may be used directly by
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| 87 | transport mechanisms that provide their own framing and packet-
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| 88 | separation mechanisms (such as UDP datagrams or RTP), Ogg is a
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| 89 | solution for stream based storage (such as files) and transport (such
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| 90 | as TCP streams or pipes). The media types defined in this document
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| 91 | are needed to correctly identify such content when it is served over
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| 92 | HTTP, included in multi-part documents, or used in other places where
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| 93 | media types [RFC2045] are used.
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| 94 |
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| 95 | 2. Changes Since RFC 3534
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| 96 |
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| 97 | o The type "application/ogg" is redefined.
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| 98 |
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| 99 | o The types "video/ogg" and "audio/ogg" are defined.
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| 100 |
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| 101 | o New file extensions are defined.
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| 102 |
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| 103 | o New Macintosh file type codes are defined.
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| 104 |
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| 105 | o The codecs parameter is defined for optional use.
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| 106 |
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| 107 | o The Ogg Skeleton extension becomes a recommended addition for
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| 108 | content served under the new types.
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| 109 |
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| 110 |
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| 111 |
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| 112 |
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| 113 |
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| 114 |
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| 115 | Goncalves, et al. Standards Track [Page 2]
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| 116 | |
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| 117 |
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| 118 | RFC 5334 Ogg Media Types September 2008
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| 119 |
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| 120 |
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| 121 | 3. Conformance and Document Conventions
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| 122 |
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| 123 | The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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| 124 | "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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| 125 | document are to be interpreted as described in BCP 14, [RFC2119] and
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| 126 | indicate requirement levels for compliant implementations.
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| 127 | Requirements apply to all implementations unless otherwise stated.
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| 128 |
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| 129 | An implementation is a software module that supports one of the media
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| 130 | types defined in this document. Software modules may support
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| 131 | multiple media types, but conformance is considered individually for
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| 132 | each type.
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| 133 |
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| 134 | Implementations that fail to satisfy one or more "MUST" requirements
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| 135 | are considered non-compliant. Implementations that satisfy all
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| 136 | "MUST" requirements, but fail to satisfy one or more "SHOULD"
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| 137 | requirements, are said to be "conditionally compliant". All other
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| 138 | implementations are "unconditionally compliant".
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| 139 |
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| 140 | 4. Deployed Media Types and Compatibility
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| 141 |
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| 142 | The application/ogg media type has been used in an ad hoc fashion to
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| 143 | label and exchange multimedia content in Ogg containers.
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| 144 |
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| 145 | Use of the "application" top-level type for this kind of content is
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| 146 | known to be problematic, in particular since it obfuscates video and
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| 147 | audio content. This document thus defines the media types,
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| 148 |
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| 149 | o video/ogg
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| 150 |
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| 151 | o audio/ogg
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| 152 |
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| 153 | which are intended for common use and SHOULD be used when dealing
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| 154 | with video or audio content, respectively. This document also
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| 155 | obsoletes the [RFC3534] definition of application/ogg and marks it
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| 156 | for complex data (e.g., multitrack visual, audio, textual, and other
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| 157 | time-continuously sampled data), which is not clearly video or audio
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| 158 | data and thus not suited for either the video/ogg or audio/ogg types.
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| 159 | Refer to the following section for more details.
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| 160 |
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| 161 | An Ogg bitstream generally consists of one or more logical bitstreams
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| 162 | that each consist of a series of header and data pages packetising
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| 163 | time-continuous binary data [RFC3533]. The content types of the
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| 164 | logical bitstreams may be identified without decoding the header
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| 165 | pages of the logical bitstreams through use of a [Skeleton]
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| 166 | bitstream. Using Ogg Skeleton is REQUIRED for content served under
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| 167 |
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| 168 |
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| 169 |
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| 170 |
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| 171 |
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| 172 | Goncalves, et al. Standards Track [Page 3]
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| 173 | |
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| 174 |
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| 175 | RFC 5334 Ogg Media Types September 2008
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| 176 |
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| 177 |
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| 178 | the application/ogg type and RECOMMENDED for video/ogg and audio/ogg,
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| 179 | as Skeleton contains identifiers to describe the different
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| 180 | encapsulated data.
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| 181 |
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| 182 | Furthermore, it is RECOMMENDED that implementations that identify a
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| 183 | logical bitstream that they cannot decode SHOULD ignore it, while
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| 184 | continuing to decode the ones they can. Such precaution ensures
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| 185 | backward and forward compatibility with existing and future data.
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| 186 |
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| 187 | These media types can optionally use the "codecs" parameter described
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| 188 | in [RFC4281]. Codecs encapsulated in Ogg require a text identifier
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| 189 | at the beginning of the first header page, hence a machine-readable
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| 190 | method to identify the encapsulated codecs would be through this
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| 191 | header. The following table illustrates how those header values map
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| 192 | into strings that are used in the "codecs" parameter when dealing
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| 193 | with Ogg media types.
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| 194 |
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| 195 | Codec Identifier | Codecs Parameter
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| 196 | -----------------------------------------------------------
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| 197 | char[5]: 'BBCD\0' | dirac
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| 198 | char[5]: '\177FLAC' | flac
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| 199 | char[7]: '\x80theora' | theora
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| 200 | char[7]: '\x01vorbis' | vorbis
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| 201 | char[8]: 'CELT ' | celt
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| 202 | char[8]: 'CMML\0\0\0\0' | cmml
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| 203 | char[8]: '\213JNG\r\n\032\n' | jng
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| 204 | char[8]: '\x80kate\0\0\0' | kate
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| 205 | char[8]: 'OggMIDI\0' | midi
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| 206 | char[8]: '\212MNG\r\n\032\n' | mng
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| 207 | char[8]: 'PCM ' | pcm
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| 208 | char[8]: '\211PNG\r\n\032\n' | png
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| 209 | char[8]: 'Speex ' | speex
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| 210 | char[8]: 'YUV4MPEG' | yuv4mpeg
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| 211 |
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| 212 | An up-to-date version of this table is kept at Xiph.org (see
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| 213 | [Codecs]).
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| 214 |
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| 215 | Possible examples include:
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| 216 |
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| 217 | o application/ogg; codecs="theora, cmml, ecmascript"
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| 218 |
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| 219 | o video/ogg; codecs="theora, vorbis"
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| 220 |
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| 221 | o audio/ogg; codecs=speex
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| 222 |
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| 223 |
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| 224 |
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| 225 |
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| 226 |
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| 227 |
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| 228 |
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| 229 | Goncalves, et al. Standards Track [Page 4]
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| 230 | |
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| 231 |
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| 232 | RFC 5334 Ogg Media Types September 2008
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| 233 |
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| 234 |
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| 235 | 5. Relation between the Media Types
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| 236 |
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| 237 | As stated in the previous section, this document describes three
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| 238 | media types that are targeted at different data encapsulated in Ogg.
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| 239 | Since Ogg is capable of encapsulating any kind of data, the multiple
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| 240 | usage scenarios have revealed interoperability issues between
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| 241 | implementations when dealing with content served solely under the
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| 242 | application/ogg type.
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| 243 |
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| 244 | While this document does redefine the earlier definition of
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| 245 | application/ogg, this media type will continue to embrace the widest
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| 246 | net possible of content with the video/ogg and audio/ogg types being
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| 247 | smaller subsets of it. However, the video/ogg and audio/ogg types
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| 248 | take precedence in a subset of the usages, specifically when serving
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| 249 | multimedia content that is not complex enough to warrant the use of
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| 250 | application/ogg. Following this line of thought, the audio/ogg type
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| 251 | is an even smaller subset within video/ogg, as it is not intended to
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| 252 | refer to visual content.
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| 253 |
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| 254 | As such, the application/ogg type is the recommended choice to serve
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| 255 | content aimed at scientific and other applications that require
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| 256 | various multiplexed signals or streams of continuous data, with or
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| 257 | without scriptable control of content. For bitstreams containing
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| 258 | visual, timed text, and any other type of material that requires a
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| 259 | visual interface, but that is not complex enough to warrant serving
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| 260 | under application/ogg, the video/ogg type is recommended. In
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| 261 | situations where the Ogg bitstream predominantly contains audio data
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| 262 | (lyrics, metadata, or cover art notwithstanding), it is recommended
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| 263 | to use the audio/ogg type.
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| 264 |
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| 265 | 6. Encoding Considerations
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| 266 |
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| 267 | Binary: The content consists of an unrestricted sequence of octets.
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| 268 |
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| 269 | Note:
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| 270 |
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| 271 | o Ogg encapsulated content is binary data and should be transmitted
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| 272 | in a suitable encoding without CR/LF conversion, 7-bit stripping,
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| 273 | etc.; base64 [RFC4648] is generally preferred for binary-to-text
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| 274 | encoding.
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| 275 |
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| 276 | o Media types described in this document are used for stream based
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| 277 | storage (such as files) and transport (such as TCP streams or
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| 278 | pipes); separate types are used to identify codecs such as in
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| 279 | real-time applications for the RTP payload formats of Theora
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| 280 | [ThRTP] video, Vorbis [RFC5215], or Speex [SpRTP] audio, as well
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| 281 | as for identification of encapsulated data within Ogg through
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| 282 | Skeleton.
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| 283 |
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| 284 |
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| 285 |
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| 286 | Goncalves, et al. Standards Track [Page 5]
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| 287 | |
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| 288 |
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| 289 | RFC 5334 Ogg Media Types September 2008
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| 290 |
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| 291 |
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| 292 | 7. Security Considerations
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| 293 |
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| 294 | Refer to [RFC3552] for a discussion of terminology used in this
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| 295 | section.
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| 296 |
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| 297 | The Ogg encapsulation format is a container and only a carrier of
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| 298 | content (such as audio, video, and displayable text data) with a very
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| 299 | rigid definition. This format in itself is not more vulnerable than
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| 300 | any other content framing mechanism.
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| 301 |
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| 302 | Ogg does not provide for any generic encryption or signing of itself
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| 303 | or its contained bitstreams. However, it encapsulates any kind of
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| 304 | binary content and is thus able to contain encrypted and signed
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| 305 | content data. It is also possible to add an external security
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| 306 | mechanism that encrypts or signs an Ogg bitstream and thus provides
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| 307 | content confidentiality and authenticity.
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| 308 |
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| 309 | As Ogg encapsulates binary data, it is possible to include executable
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| 310 | content in an Ogg bitstream. Implementations SHOULD NOT execute such
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| 311 | content without prior validation of its origin by the end-user.
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| 312 |
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| 313 | Issues may arise on applications that use Ogg for streaming or file
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| 314 | transfer in a networking scenario. In such cases, implementations
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| 315 | decoding Ogg and its encapsulated bitstreams have to ensure correct
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| 316 | handling of manipulated bitstreams, of buffer overflows, and similar
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| 317 | issues.
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| 318 |
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| 319 | It is also possible to author malicious Ogg bitstreams, which attempt
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| 320 | to call for an excessively large picture size, high sampling-rate
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| 321 | audio, etc. Implementations SHOULD protect themselves against this
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| 322 | kind of attack.
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| 323 |
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| 324 | Ogg has an extensible structure, so that it is theoretically possible
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| 325 | that metadata fields or media formats might be defined in the future
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| 326 | which might be used to induce particular actions on the part of the
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| 327 | recipient, thus presenting additional security risks. However, this
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| 328 | type of capability is currently not supported in the referenced
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| 329 | specification.
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| 330 |
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| 331 | Implementations may fail to implement a specific security model or
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| 332 | other means to prevent possibly dangerous operations. Such failure
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| 333 | might possibly be exploited to gain unauthorized access to a system
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| 334 | or sensitive information; such failure constitutes an unknown factor
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| 335 | and is thus considered out of the scope of this document.
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| 336 |
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| 337 |
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| 338 |
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| 339 |
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| 340 |
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| 341 |
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| 342 |
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| 343 | Goncalves, et al. Standards Track [Page 6]
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| 344 | |
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| 345 |
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| 346 | RFC 5334 Ogg Media Types September 2008
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| 347 |
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| 348 |
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| 349 | 8. Interoperability Considerations
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| 350 |
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| 351 | The Ogg container format is device-, platform-, and vendor-neutral
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| 352 | and has proved to be widely implementable across different computing
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| 353 | platforms through a wide range of encoders and decoders. A broadly
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| 354 | portable reference implementation [libogg] is available under the
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| 355 | revised (3-clause) BSD license, which is a Free Software license.
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| 356 |
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| 357 | The Xiph.Org Foundation has defined the specification,
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| 358 | interoperability, and conformance and conducts regular
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| 359 | interoperability testing.
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| 360 |
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| 361 | The use of the Ogg Skeleton extension has been confirmed to not cause
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| 362 | interoperability issues with existing implementations. Third parties
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| 363 | are, however, welcome to conduct their own testing.
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| 364 |
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| 365 | 9. IANA Considerations
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| 366 |
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| 367 | In accordance with the procedures set forth in [RFC4288], this
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| 368 | document registers two new media types and redefines the existing
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| 369 | application/ogg as defined in the following section.
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| 370 |
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| 371 | 10. Ogg Media Types
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| 372 |
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| 373 | 10.1. application/ogg
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| 374 |
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| 375 | Type name: application
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| 376 |
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| 377 | Subtype name: ogg
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| 378 |
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| 379 | Required parameters: none
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| 380 |
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| 381 | Optional parameters: codecs, whose syntax is defined in RFC 4281.
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| 382 | See section 4 of RFC 5334 for a list of allowed values.
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| 383 |
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| 384 | Encoding considerations: See section 6 of RFC 5334.
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| 385 |
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| 386 | Security considerations: See section 7 of RFC 5334.
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| 387 |
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| 388 | Interoperability considerations: None, as noted in section 8 of RFC
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| 389 | 5334.
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| 390 |
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| 391 | Published specification: RFC 3533
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| 392 |
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| 393 | Applications which use this media type: Scientific and otherwise that
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| 394 | require various multiplexed signals or streams of data, with or
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| 395 | without scriptable control of content.
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| 396 |
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| 397 |
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| 398 |
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| 399 |
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| 400 | Goncalves, et al. Standards Track [Page 7]
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| 401 | |
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| 402 |
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| 403 | RFC 5334 Ogg Media Types September 2008
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| 404 |
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| 405 |
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| 406 | Additional information:
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|---|
| 407 |
|
|---|
| 408 | Magic number(s): The first four bytes, 0x4f 0x67 0x67 0x53,
|
|---|
| 409 | correspond to the string "OggS".
|
|---|
| 410 |
|
|---|
| 411 | File extension(s): .ogx
|
|---|
| 412 |
|
|---|
| 413 | RFC 3534 defined the file extension .ogg for application/ogg,
|
|---|
| 414 | which RFC 5334 obsoletes in favor of .ogx due to concerns where,
|
|---|
| 415 | historically, some implementations expect .ogg files to be solely
|
|---|
| 416 | Vorbis-encoded audio.
|
|---|
| 417 |
|
|---|
| 418 | Macintosh File Type Code(s): OggX
|
|---|
| 419 |
|
|---|
| 420 | Person & Email address to contact for further information: See
|
|---|
| 421 | "Authors' Addresses" section.
|
|---|
| 422 |
|
|---|
| 423 | Intended usage: COMMON
|
|---|
| 424 |
|
|---|
| 425 | Restrictions on usage: The type application/ogg SHOULD only be used
|
|---|
| 426 | in situations where it is not appropriate to serve data under the
|
|---|
| 427 | video/ogg or audio/ogg types. Data served under the application/ogg
|
|---|
| 428 | type SHOULD use the .ogx file extension and MUST contain an Ogg
|
|---|
| 429 | Skeleton logical bitstream to identify all other contained logical
|
|---|
| 430 | bitstreams.
|
|---|
| 431 |
|
|---|
| 432 | Author: See "Authors' Addresses" section.
|
|---|
| 433 |
|
|---|
| 434 | Change controller: The Xiph.Org Foundation.
|
|---|
| 435 |
|
|---|
| 436 | 10.2. video/ogg
|
|---|
| 437 |
|
|---|
| 438 | Type name: video
|
|---|
| 439 |
|
|---|
| 440 | Subtype name: ogg
|
|---|
| 441 |
|
|---|
| 442 | Required parameters: none
|
|---|
| 443 |
|
|---|
| 444 | Optional parameters: codecs, whose syntax is defined in RFC 4281.
|
|---|
| 445 | See section 4 of RFC 5334 for a list of allowed values.
|
|---|
| 446 |
|
|---|
| 447 | Encoding considerations: See section 6 of RFC 5334.
|
|---|
| 448 |
|
|---|
| 449 | Security considerations: See section 7 of RFC 5334.
|
|---|
| 450 |
|
|---|
| 451 | Interoperability considerations: None, as noted in section 8 of RFC
|
|---|
| 452 | 5334.
|
|---|
| 453 |
|
|---|
| 454 |
|
|---|
| 455 |
|
|---|
| 456 |
|
|---|
| 457 | Goncalves, et al. Standards Track [Page 8]
|
|---|
| 458 | |
|---|
| 459 |
|
|---|
| 460 | RFC 5334 Ogg Media Types September 2008
|
|---|
| 461 |
|
|---|
| 462 |
|
|---|
| 463 | Published specification: RFC 3533
|
|---|
| 464 |
|
|---|
| 465 | Applications which use this media type: Multimedia applications,
|
|---|
| 466 | including embedded, streaming, and conferencing tools.
|
|---|
| 467 |
|
|---|
| 468 | Additional information:
|
|---|
| 469 |
|
|---|
| 470 | Magic number(s): The first four bytes, 0x4f 0x67 0x67 0x53,
|
|---|
| 471 | correspond to the string "OggS".
|
|---|
| 472 |
|
|---|
| 473 | File extension(s): .ogv
|
|---|
| 474 |
|
|---|
| 475 | Macintosh File Type Code(s): OggV
|
|---|
| 476 |
|
|---|
| 477 | Person & Email address to contact for further information: See
|
|---|
| 478 | "Authors' Addresses" section.
|
|---|
| 479 |
|
|---|
| 480 | Intended usage: COMMON
|
|---|
| 481 |
|
|---|
| 482 | Restrictions on usage: The type "video/ogg" SHOULD be used for Ogg
|
|---|
| 483 | bitstreams containing visual, audio, timed text, or any other type of
|
|---|
| 484 | material that requires a visual interface. It is intended for
|
|---|
| 485 | content not complex enough to warrant serving under "application/
|
|---|
| 486 | ogg"; for example, a combination of Theora video, Vorbis audio,
|
|---|
| 487 | Skeleton metadata, and CMML captioning. Data served under the type
|
|---|
| 488 | "video/ogg" SHOULD contain an Ogg Skeleton logical bitstream.
|
|---|
| 489 | Implementations interacting with the type "video/ogg" SHOULD support
|
|---|
| 490 | multiplexed bitstreams.
|
|---|
| 491 |
|
|---|
| 492 | Author: See "Authors' Addresses" section.
|
|---|
| 493 |
|
|---|
| 494 | Change controller: The Xiph.Org Foundation.
|
|---|
| 495 |
|
|---|
| 496 | 10.3. audio/ogg
|
|---|
| 497 |
|
|---|
| 498 | Type name: audio
|
|---|
| 499 |
|
|---|
| 500 | Subtype name: ogg
|
|---|
| 501 |
|
|---|
| 502 | Required parameters: none
|
|---|
| 503 |
|
|---|
| 504 | Optional parameters: codecs, whose syntax is defined in RFC 4281.
|
|---|
| 505 | See section 4 of RFC 5334 for a list of allowed values.
|
|---|
| 506 |
|
|---|
| 507 | Encoding considerations: See section 6 of RFC 5334.
|
|---|
| 508 |
|
|---|
| 509 | Security considerations: See section 7 of RFC 5334.
|
|---|
| 510 |
|
|---|
| 511 |
|
|---|
| 512 |
|
|---|
| 513 |
|
|---|
| 514 | Goncalves, et al. Standards Track [Page 9]
|
|---|
| 515 | |
|---|
| 516 |
|
|---|
| 517 | RFC 5334 Ogg Media Types September 2008
|
|---|
| 518 |
|
|---|
| 519 |
|
|---|
| 520 | Interoperability considerations: None, as noted in section 8 of RFC
|
|---|
| 521 | 5334.
|
|---|
| 522 |
|
|---|
| 523 | Published specification: RFC 3533
|
|---|
| 524 |
|
|---|
| 525 | Applications which use this media type: Multimedia applications,
|
|---|
| 526 | including embedded, streaming, and conferencing tools.
|
|---|
| 527 |
|
|---|
| 528 | Additional information:
|
|---|
| 529 |
|
|---|
| 530 | Magic number(s): The first four bytes, 0x4f 0x67 0x67 0x53,
|
|---|
| 531 | correspond to the string "OggS".
|
|---|
| 532 |
|
|---|
| 533 | File extension(s): .oga, .ogg, .spx
|
|---|
| 534 |
|
|---|
| 535 | Macintosh File Type Code(s): OggA
|
|---|
| 536 |
|
|---|
| 537 | Person & Email address to contact for further information: See
|
|---|
| 538 | "Authors' Addresses" section.
|
|---|
| 539 |
|
|---|
| 540 | Intended usage: COMMON
|
|---|
| 541 |
|
|---|
| 542 | Restrictions on usage: The type "audio/ogg" SHOULD be used when the
|
|---|
| 543 | Ogg bitstream predominantly contains audio data. Content served
|
|---|
| 544 | under the "audio/ogg" type SHOULD have an Ogg Skeleton logical
|
|---|
| 545 | bitstream when using the default .oga file extension. The .ogg and
|
|---|
| 546 | .spx file extensions indicate a specialization that requires no
|
|---|
| 547 | Skeleton due to backward compatibility concerns with existing
|
|---|
| 548 | implementations. In particular, .ogg is used for Ogg files that
|
|---|
| 549 | contain only a Vorbis bitstream, while .spx is used for Ogg files
|
|---|
| 550 | that contain only a Speex bitstream.
|
|---|
| 551 |
|
|---|
| 552 | Author: See "Authors' Addresses" section.
|
|---|
| 553 |
|
|---|
| 554 | Change controller: The Xiph.Org Foundation.
|
|---|
| 555 |
|
|---|
| 556 | 11. Acknowledgements
|
|---|
| 557 |
|
|---|
| 558 | The authors gratefully acknowledge the contributions of Magnus
|
|---|
| 559 | Westerlund, Alfred Hoenes, and Peter Saint-Andre.
|
|---|
| 560 |
|
|---|
| 561 | 12. Copying Conditions
|
|---|
| 562 |
|
|---|
| 563 | The authors agree to grant third parties the irrevocable right to
|
|---|
| 564 | copy, use and distribute the work, with or without modification, in
|
|---|
| 565 | any medium, without royalty, provided that, unless separate
|
|---|
| 566 | permission is granted, redistributed modified works do not contain
|
|---|
| 567 | misleading author, version, name of work, or endorsement information.
|
|---|
| 568 |
|
|---|
| 569 |
|
|---|
| 570 |
|
|---|
| 571 | Goncalves, et al. Standards Track [Page 10]
|
|---|
| 572 | |
|---|
| 573 |
|
|---|
| 574 | RFC 5334 Ogg Media Types September 2008
|
|---|
| 575 |
|
|---|
| 576 |
|
|---|
| 577 | 13. References
|
|---|
| 578 |
|
|---|
| 579 | 13.1. Normative References
|
|---|
| 580 |
|
|---|
| 581 | [RFC2045] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
|
|---|
| 582 | Extensions (MIME) Part One: Format of Internet Message
|
|---|
| 583 | Bodies", RFC 2045, November 1996.
|
|---|
| 584 |
|
|---|
| 585 | [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
|
|---|
| 586 | Requirement Levels", BCP 14, RFC 2119, March 1997.
|
|---|
| 587 |
|
|---|
| 588 | [RFC3533] Pfeiffer, S., "The Ogg Encapsulation Format Version 0",
|
|---|
| 589 | RFC 3533, May 2003.
|
|---|
| 590 |
|
|---|
| 591 | [RFC4281] Gellens, R., Singer, D., and P. Frojdh, "The Codecs
|
|---|
| 592 | Parameter for "Bucket" Media Types", RFC 4281,
|
|---|
| 593 | November 2005.
|
|---|
| 594 |
|
|---|
| 595 | [RFC4288] Freed, N. and J. Klensin, "Media Type Specifications and
|
|---|
| 596 | Registration Procedures", BCP 13, RFC 4288,
|
|---|
| 597 | December 2005.
|
|---|
| 598 |
|
|---|
| 599 | 13.2. Informative References
|
|---|
| 600 |
|
|---|
| 601 | [CMML] Pfeiffer, S., Parker, C., and A. Pang, "The Continuous
|
|---|
| 602 | Media Markup Language (CMML)", Work in Progress,
|
|---|
| 603 | March 2006.
|
|---|
| 604 |
|
|---|
| 605 | [Codecs] Pfeiffer, S. and I. Goncalves, "Specification of MIME
|
|---|
| 606 | types and respective codecs parameter", July 2008,
|
|---|
| 607 | <http://wiki.xiph.org/index.php/MIMETypesCodecs>.
|
|---|
| 608 |
|
|---|
| 609 | [Dirac] Dirac Group, "Dirac Specification",
|
|---|
| 610 | <http://diracvideo.org/specifications/>.
|
|---|
| 611 |
|
|---|
| 612 | [FLAC] Coalson, J., "The FLAC Format",
|
|---|
| 613 | <http://flac.sourceforge.net/format.html>.
|
|---|
| 614 |
|
|---|
| 615 | [libogg] Xiph.Org Foundation, "The libogg API", June 2000,
|
|---|
| 616 | <http://xiph.org/ogg/doc/libogg>.
|
|---|
| 617 |
|
|---|
| 618 | [Ogg] Xiph.Org Foundation, "Ogg bitstream documentation: Ogg
|
|---|
| 619 | logical and physical bitstream overview, Ogg logical
|
|---|
| 620 | bitstream framing, Ogg multi-stream multiplexing",
|
|---|
| 621 | <http://xiph.org/ogg/doc>.
|
|---|
| 622 |
|
|---|
| 623 | [RFC3534] Walleij, L., "The application/ogg Media Type", RFC 3534,
|
|---|
| 624 | May 2003.
|
|---|
| 625 |
|
|---|
| 626 |
|
|---|
| 627 |
|
|---|
| 628 | Goncalves, et al. Standards Track [Page 11]
|
|---|
| 629 | |
|---|
| 630 |
|
|---|
| 631 | RFC 5334 Ogg Media Types September 2008
|
|---|
| 632 |
|
|---|
| 633 |
|
|---|
| 634 | [RFC3552] Rescorla, E. and B. Korver, "Guidelines for Writing RFC
|
|---|
| 635 | Text on Security Considerations", BCP 72, RFC 3552,
|
|---|
| 636 | July 2003.
|
|---|
| 637 |
|
|---|
| 638 | [RFC4648] Josefsson, S., "The Base16, Base32, and Base64 Data
|
|---|
| 639 | Encodings", RFC 4648, October 2006.
|
|---|
| 640 |
|
|---|
| 641 | [RFC5215] Barbato, L., "RTP Payload Format for Vorbis Encoded
|
|---|
| 642 | Audio", RFC 5215, August 2008.
|
|---|
| 643 |
|
|---|
| 644 | [Skeleton] Pfeiffer, S. and C. Parker, "The Ogg Skeleton Metadata
|
|---|
| 645 | Bitstream", November 2007,
|
|---|
| 646 | <http://xiph.org/ogg/doc/skeleton.html>.
|
|---|
| 647 |
|
|---|
| 648 | [Speex] Valin, J., "The Speex Codec Manual", February 2002,
|
|---|
| 649 | <http://speex.org/docs/manual/speex-manual>.
|
|---|
| 650 |
|
|---|
| 651 | [SpRTP] Herlein, G., Valin, J., Heggestad, A., and A. Moizard,
|
|---|
| 652 | "RTP Payload Format for the Speex Codec", Work
|
|---|
| 653 | in Progress, February 2008.
|
|---|
| 654 |
|
|---|
| 655 | [Theora] Xiph.Org Foundation, "Theora Specification",
|
|---|
| 656 | October 2007, <http://theora.org/doc/Theora.pdf>.
|
|---|
| 657 |
|
|---|
| 658 | [ThRTP] Barbato, L., "RTP Payload Format for Theora Encoded
|
|---|
| 659 | Video", Work in Progress, June 2006.
|
|---|
| 660 |
|
|---|
| 661 | [Vorbis] Xiph.Org Foundation, "Vorbis I Specification", July 2004,
|
|---|
| 662 | <http://xiph.org/vorbis/doc/Vorbis_I_spec.html>.
|
|---|
| 663 |
|
|---|
| 664 |
|
|---|
| 665 |
|
|---|
| 666 |
|
|---|
| 667 |
|
|---|
| 668 |
|
|---|
| 669 |
|
|---|
| 670 |
|
|---|
| 671 |
|
|---|
| 672 |
|
|---|
| 673 |
|
|---|
| 674 |
|
|---|
| 675 |
|
|---|
| 676 |
|
|---|
| 677 |
|
|---|
| 678 |
|
|---|
| 679 |
|
|---|
| 680 |
|
|---|
| 681 |
|
|---|
| 682 |
|
|---|
| 683 |
|
|---|
| 684 |
|
|---|
| 685 | Goncalves, et al. Standards Track [Page 12]
|
|---|
| 686 | |
|---|
| 687 |
|
|---|
| 688 | RFC 5334 Ogg Media Types September 2008
|
|---|
| 689 |
|
|---|
| 690 |
|
|---|
| 691 | Authors' Addresses
|
|---|
| 692 |
|
|---|
| 693 | Ivo Emanuel Goncalves
|
|---|
| 694 | Xiph.Org Foundation
|
|---|
| 695 | 21 College Hill Road
|
|---|
| 696 | Somerville, MA 02144
|
|---|
| 697 | US
|
|---|
| 698 |
|
|---|
| 699 | EMail: justivo@gmail.com
|
|---|
| 700 | URI: xmpp:justivo@gmail.com
|
|---|
| 701 |
|
|---|
| 702 |
|
|---|
| 703 | Silvia Pfeiffer
|
|---|
| 704 | Xiph.Org Foundation
|
|---|
| 705 |
|
|---|
| 706 | EMail: silvia@annodex.net
|
|---|
| 707 | URI: http://annodex.net/
|
|---|
| 708 |
|
|---|
| 709 |
|
|---|
| 710 | Christopher Montgomery
|
|---|
| 711 | Xiph.Org Foundation
|
|---|
| 712 |
|
|---|
| 713 | EMail: monty@xiph.org
|
|---|
| 714 | URI: http://xiph.org
|
|---|
| 715 |
|
|---|
| 716 |
|
|---|
| 717 |
|
|---|
| 718 |
|
|---|
| 719 |
|
|---|
| 720 |
|
|---|
| 721 |
|
|---|
| 722 |
|
|---|
| 723 |
|
|---|
| 724 |
|
|---|
| 725 |
|
|---|
| 726 |
|
|---|
| 727 |
|
|---|
| 728 |
|
|---|
| 729 |
|
|---|
| 730 |
|
|---|
| 731 |
|
|---|
| 732 |
|
|---|
| 733 |
|
|---|
| 734 |
|
|---|
| 735 |
|
|---|
| 736 |
|
|---|
| 737 |
|
|---|
| 738 |
|
|---|
| 739 |
|
|---|
| 740 |
|
|---|
| 741 |
|
|---|
| 742 | Goncalves, et al. Standards Track [Page 13]
|
|---|
| 743 | |
|---|
| 744 |
|
|---|
| 745 | RFC 5334 Ogg Media Types September 2008
|
|---|
| 746 |
|
|---|
| 747 |
|
|---|
| 748 | Full Copyright Statement
|
|---|
| 749 |
|
|---|
| 750 | Copyright (C) The IETF Trust (2008).
|
|---|
| 751 |
|
|---|
| 752 | This document is subject to the rights, licenses and restrictions
|
|---|
| 753 | contained in BCP 78, and except as set forth therein, the authors
|
|---|
| 754 | retain all their rights.
|
|---|
| 755 |
|
|---|
| 756 | This document and the information contained herein are provided on an
|
|---|
| 757 | "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
|
|---|
| 758 | OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
|
|---|
| 759 | THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
|
|---|
| 760 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
|
|---|
| 761 | THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
|
|---|
| 762 | WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
|
|---|
| 763 |
|
|---|
| 764 | Intellectual Property
|
|---|
| 765 |
|
|---|
| 766 | The IETF takes no position regarding the validity or scope of any
|
|---|
| 767 | Intellectual Property Rights or other rights that might be claimed to
|
|---|
| 768 | pertain to the implementation or use of the technology described in
|
|---|
| 769 | this document or the extent to which any license under such rights
|
|---|
| 770 | might or might not be available; nor does it represent that it has
|
|---|
| 771 | made any independent effort to identify any such rights. Information
|
|---|
| 772 | on the procedures with respect to rights in RFC documents can be
|
|---|
| 773 | found in BCP 78 and BCP 79.
|
|---|
| 774 |
|
|---|
| 775 | Copies of IPR disclosures made to the IETF Secretariat and any
|
|---|
| 776 | assurances of licenses to be made available, or the result of an
|
|---|
| 777 | attempt made to obtain a general license or permission for the use of
|
|---|
| 778 | such proprietary rights by implementers or users of this
|
|---|
| 779 | specification can be obtained from the IETF on-line IPR repository at
|
|---|
| 780 | http://www.ietf.org/ipr.
|
|---|
| 781 |
|
|---|
| 782 | The IETF invites any interested party to bring to its attention any
|
|---|
| 783 | copyrights, patents or patent applications, or other proprietary
|
|---|
| 784 | rights that may cover technology that may be required to implement
|
|---|
| 785 | this standard. Please address the information to the IETF at
|
|---|
| 786 | ietf-ipr@ietf.org.
|
|---|
| 787 |
|
|---|
| 788 |
|
|---|
| 789 |
|
|---|
| 790 |
|
|---|
| 791 |
|
|---|
| 792 |
|
|---|
| 793 |
|
|---|
| 794 |
|
|---|
| 795 |
|
|---|
| 796 |
|
|---|
| 797 |
|
|---|
| 798 |
|
|---|
| 799 | Goncalves, et al. Standards Track [Page 14]
|
|---|
| 800 | |
|---|
| 801 |
|
|---|
