Appendix C: Rtp Format - Digigram PYKO-in User Manual

10. APPENDIX C: RTP FORMAT

An audio stream encoder must respect the size and the ​ p ayload type described underneath.
RTP frame size
The maximum payload size in bytes for the encoder can be calculated from the formula:
where chans is the number of channels, ​ b ps is the number of bytes per sample and samplerate is
the sampling rate in Hertz.
The maximum payload size for MP3 is 1400 bytes.
RTP payload types
The following table shows the defined RTP payload types that the encoder must respect.
RTP
payload Audio formats
type
0
μ​ - Law, 8bit, mono, 8kHz
8
A-Law, 8bit, mono, 8kHz
PCM, 16bit, MSB first, signed, 44.1 kHz stereo, left channel
10
first
11
PCM, 16bit, MSB first, signed, 44.1 kHz mono
14
MPEG audio
96
PCM ,16bit, MSB first, signed, 8 kHz mono
99/113
PCM, 16bit, MSB first, signed, 24 kHz mono
*
102
PCM, 16bit, MSB first, signed, 32 kHz mono reserved
PCM 16bit, MSB first, signed, 48 kHz stereo, left channel
103
first
111
PCM ,16bit, MSB first, signed, 12 kHz mono
127
Other formats
*113 as of firmware v020
Payload types 0, 8, 10, 11 and 14 are defined by the RTP standard. Digigram defines assignment
for payload types 96 to 127 (dynamic payload types) in the above tables.
PYKO-in: Professional IP audio endpoint
Min(1300, 20.​ c hans.​ B ps.​ s amplerate/1000)
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