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62 lines
2.4 KiB
62 lines
2.4 KiB
// IANA Assigned VoIP Codec Payload Types
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//
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// The following codecs have been standardized by IANA thereby
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// allowing their 'a=rtpmap' information to be omitted in SDP
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// messages. they've been hard coded to make your life easier.
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//
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// Many of these codecs (G711, G722, G726, GSM, LPC) have been
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// implemented by Steve Underwood in his excellent SpanDSP library.
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//
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// Newer codecs like silk, broadvoice, speex, etc. use a dynamic
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// payload type.
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//
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// Reference Material:
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//
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// - IANA Payload Types: http://www.iana.org/assignments/rtp-parameters
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// - Explains well-known ITU codecs: http://tools.ietf.org/html/rfc3551
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//
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package sdp
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var (
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ULAWCodec = &Codec{PT: 0, Name: "PCMU", Rate: 8000}
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DTMFCodec = &Codec{PT: 101, Name: "telephone-event", Rate: 8000, Fmtp: "0-16"}
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StandardCodecs = map[uint8]*Codec{
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// G.711 μ-Law is the de-facto codec (SpanDSP g711.h)
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0: ULAWCodec,
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// Uncool codec asterisk ppl like (SpanDSP gsm0610.h)
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3: &Codec{PT: 3, Name: "GSM", Rate: 8000},
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4: &Codec{PT: 4, Name: "G723", Rate: 8000},
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// adaptive pulse code modulation (SpanDSP ima_adpcm.h)
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5: &Codec{PT: 5, Name: "DVI4", Rate: 8000},
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6: &Codec{PT: 6, Name: "DVI4", Rate: 16000},
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// chat with your friends ww2 field marshall style (SpanDSP lpc10.h)
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7: &Codec{PT: 7, Name: "LPC", Rate: 8000},
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// G.711 variant of μ-Law used in yurop (SpanDSP g711.h)
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8: &Codec{PT: 8, Name: "PCMA", Rate: 8000},
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// used for Polycom HD Voice; rate actually 16khz lol (SpanDSP g722.h)
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9: &Codec{PT: 9, Name: "G722", Rate: 8000},
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// 16-bit signed PCM stereo/mono (mind your MTU; adjust ptime)
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10: &Codec{PT: 10, Name: "L16", Rate: 44100, Param: "2"},
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11: &Codec{PT: 11, Name: "L16", Rate: 44100},
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12: &Codec{PT: 12, Name: "QCELP", Rate: 8000},
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// RFC3389 comfort noise
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13: &Codec{PT: 13, Name: "CN", Rate: 8000},
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14: &Codec{PT: 14, Name: "MPA", Rate: 90000},
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15: &Codec{PT: 15, Name: "G728", Rate: 8000},
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16: &Codec{PT: 16, Name: "DVI4", Rate: 11025},
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17: &Codec{PT: 17, Name: "DVI4", Rate: 22050},
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// best voice codec (if you got $10 bucks)
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18: &Codec{PT: 18, Name: "G729", Rate: 8000},
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25: &Codec{PT: 25, Name: "CelB", Rate: 90000},
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26: &Codec{PT: 26, Name: "JPEG", Rate: 90000},
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28: &Codec{PT: 28, Name: "nv", Rate: 90000},
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// RFC4587 video
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31: &Codec{PT: 31, Name: "H261", Rate: 90000},
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32: &Codec{PT: 32, Name: "MPV", Rate: 90000},
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33: &Codec{PT: 33, Name: "MP2T", Rate: 90000},
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// $$$ video
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34: &Codec{PT: 34, Name: "H263", Rate: 90000},
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}
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)
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