Audio
Overview
The AirPlay 2 audio streaming can be either real time or buffered. The
sender asks the receiver to instantiate the audio channel accordingly (SETUP).
Audio formats
The following bitmask defines the possible audio formats announce by the sender
with a SETUP request.
| Bit | Value | Type |
|---|---|---|
| 2 | 0x4 | PCM/8000/16/1 |
| 3 | 0x8 | PCM/8000/16/2 |
| 4 | 0x10 | PCM/16000/16/1 |
| 5 | 0x20 | PCM/16000/16/2 |
| 6 | 0x40 | PCM/24000/16/1 |
| 7 | 0x80 | PCM/24000/16/2 |
| 8 | 0x100 | PCM/32000/16/1 |
| 9 | 0x200 | PCM/32000/16/2 |
| 10 | 0x400 | PCM/44100/16/1 |
| 11 | 0x800 | PCM/44100/16/2 |
| 12 | 0x1000 | PCM/44100/24/1 |
| 13 | 0x2000 | PCM/44100/24/2 |
| 14 | 0x4000 | PCM/48000/16/1 |
| 15 | 0x8000 | PCM/48000/16/2 |
| 16 | 0x10000 | PCM/48000/24/1 |
| 17 | 0x20000 | PCM/48000/24/2 |
| 18 | 0x40000 | ALAC/44100/16/2 |
| 19 | 0x80000 | ALAC/44100/24/2 |
| 20 | 0x100000 | ALAC/48000/16/2 |
| 21 | 0x200000 | ALAC/48000/24/2 |
| 22 | 0x400000 | AAC-LC/44100/2 |
| 23 | 0x800000 | AAC-LC/48000/2 |
| 24 | 0x1000000 | AAC-ELD/44100/2 |
| 25 | 0x2000000 | AAC-ELD/48000/2 |
| 26 | 0x4000000 | AAC-ELD/16000/1 |
| 27 | 0x8000000 | AAC-ELD/24000/1 |
| 28 | 0x10000000 | OPUS/16000/1 |
| 29 | 0x20000000 | OPUS/24000/1 |
| 30 | 0x40000000 | OPUS/48000/1 |
| 31 | 0x80000000 | AAC-ELD/44100/1 |
| 32 | 0x100000000 | AAC-ELD/48000/1 |
