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  1. 2016.10.11 RTP Payload Type 참고자료

RTP Payload Type 참고자료

CiscoNetwork 2016. 10. 11. 12:04 Posted by TanSanC
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RTP Payload Type 참고자료



https://tools.ietf.org/html/rfc1890


      PT         encoding      audio/video    clock rate    channels
                 name          (A/V)          (Hz)          (audio)
      _______________________________________________________________
      0          PCMU          A              8000          1
      1          1016          A              8000          1
      2          G721          A              8000          1
      3          GSM           A              8000          1
      4          unassigned    A              8000          1
      5          DVI4          A              8000          1
      6          DVI4          A              16000         1
      7          LPC           A              8000          1
      8          PCMA          A              8000          1
      9          G722          A              8000          1
      10         L16           A              44100         2
      11         L16           A              44100         1
      12         unassigned    A
      13         unassigned    A
      14         MPA           A              90000        (see text)
      15         G728          A              8000          1
      16--23     unassigned    A
      24         unassigned    V
      25         CelB          V              90000
      26         JPEG          V              90000
      27         unassigned    V
      28         nv            V              90000
      29         unassigned    V
      30         unassigned    V
      31         H261          V              90000
      32         MPV           V              90000
      33         MP2T          AV             90000
      34--71     unassigned    ?
      72--76     reserved      N/A            N/A           N/A
      77--95     unassigned    ?
      96--127    dynamic       ?

   Table 2: Payload types (PT) for standard audio and video encodings

https://tools.ietf.org/html/rfc3551#page-32


               PT   encoding    media type  clock rate   channels
                    name                    (Hz)
               ___________________________________________________
               0    PCMU        A            8,000       1
               1    reserved    A
               2    reserved    A
               3    GSM         A            8,000       1
               4    G723        A            8,000       1
               5    DVI4        A            8,000       1
               6    DVI4        A           16,000       1
               7    LPC         A            8,000       1
               8    PCMA        A            8,000       1
               9    G722        A            8,000       1
               10   L16         A           44,100       2
               11   L16         A           44,100       1
               12   QCELP       A            8,000       1
               13   CN          A            8,000       1
               14   MPA         A           90,000       (see text)
               15   G728        A            8,000       1
               16   DVI4        A           11,025       1
               17   DVI4        A           22,050       1
               18   G729        A            8,000       1
               19   reserved    A
               20   unassigned  A
               21   unassigned  A
               22   unassigned  A
               23   unassigned  A
               dyn  G726-40     A            8,000       1
               dyn  G726-32     A            8,000       1
               dyn  G726-24     A            8,000       1
               dyn  G726-16     A            8,000       1
               dyn  G729D       A            8,000       1
               dyn  G729E       A            8,000       1
               dyn  GSM-EFR     A            8,000       1
               dyn  L8          A            var.        var.
               dyn  RED         A                        (see text)
               dyn  VDVI        A            var.        1

               Table 4: Payload types (PT) for audio encodings





http://www.ktword.co.kr/abbr_view.php?m_temp1=3394

     - 오디오 타입 번호 例)
        . 0 -> G.711 PCM(mu-law), 샘플링주파수 8000 Hz
        . 3 -> GSM,               샘플링주파수 8000 Hz
        . 4 -> G.723,             샘플링주파수 8000 Hz
        . 6 -> DVI4 (ADPCM),      샘플링주파수 16000 Hz
        . 7 -> LPC,               샘플링주파수 8000 Hz
        . 8 -> G.711 PCM(A-Law)   샘플링주파수 8000 Hz
        . 9 -> G.722,             샘플링주파수 8000 Hz
        . 14 -> MPEG 오디오,      샘플링주파수 90000 Hz
        . 15 -> G.728,            샘플링주파수 8000 Hz

https://tools.ietf.org/html/rfc1890


4. Audio

4.1 Encoding-Independent Recommendations

For applications which send no packets during silence, the first packet of a talkspurt (first packet after a silence period) is distinguished by setting the marker bit in the RTP data header. Applications without silence suppression set the bit to zero. The RTP clock rate used for generating the RTP timestamp is independent of the number of channels and the encoding; it equals the number of sampling periods per second. For N-channel encodings, each sampling period (say, 1/8000 of a second) generates N samples. (This terminology is standard, but somewhat confusing, as the total number of samples generated per second is then the sampling rate times the channel count.) If multiple audio channels are used, channels are numbered left-to- right, starting at one. In RTP audio packets, information from lower-numbered channels precedes that from higher-numbered channels. For more than two channels, the convention followed by the AIFF-C audio interchange format should be followed [1], using the following notation: l left r right c center S surround F front R rear channels description channel 1 2 3 4 5 6 ___________________________________________________________ 2 stereo l r 3 l r c 4 quadrophonic Fl Fr Rl Rr 4 l c r S 5 Fl Fr Fc Sl Sr 6 l lc c r rc S



https://tools.ietf.org/html/rfc3551#page-32


4.4 Audio Encodings

encoding sample/frame bits/sample ms/frame ____________________________________________________ 1016 frame N/A 30 DVI4 sample 4 G721 sample 4 G722 sample 8 G728 frame N/A 2.5 GSM frame N/A 20 L8 sample 8 L16 sample 16 LPC frame N/A 20 MPA frame N/A PCMA sample 8 PCMU sample 8 VDVI sample var. Table 1: Properties of Audio Encodings

4.5 Audio Encodings

name of sampling default encoding sample/frame bits/sample rate ms/frame ms/packet __________________________________________________________________ DVI4 sample 4 var. 20 G722 sample 8 16,000 20 G723 frame N/A 8,000 30 30 G726-40 sample 5 8,000 20 G726-32 sample 4 8,000 20 G726-24 sample 3 8,000 20 G726-16 sample 2 8,000 20 G728 frame N/A 8,000 2.5 20 G729 frame N/A 8,000 10 20 G729D frame N/A 8,000 10 20 G729E frame N/A 8,000 10 20 GSM frame N/A 8,000 20 20 GSM-EFR frame N/A 8,000 20 20 L8 sample 8 var. 20 L16 sample 16 var. 20 LPC frame N/A 8,000 20 20 MPA frame N/A var. var. PCMA sample 8 var. 20 PCMU sample 8 var. 20 QCELP frame N/A 8,000 20 20 VDVI sample var. var. 20 Table 1: Properties of Audio Encodings (N/A: not applicable; var.: variable)