Metadata
Metadata for the current track are sent using SET_PARAMETER requests.
This allows the Apple TV to show the track name, artist, album, cover
artwork and timeline. The RTP-Info header contains a rtptime parameter
with the RTP timestamp corresponding to the time from which the metadata
is valid.
| md | bit | description |
|---|---|---|
| 0 | 17 | text |
| 1 | 15 | artwork |
| 2 | 16 | progress |
| 50 | bplist |
Track Informations
Informations about the current track are sent in the [DAAP] format, with
application/x-dmap-tagged content type.
The following DAAP attributes are displayed on Apple TV:
| attributes | description |
|---|---|
| dmap.itemname | track name |
| daap.songartist | artist |
| daap.songalbum | album |
Example: send track informations
client → server
SET_PARAMETER rtsp://fe80::217:f2ff:fe0f:e0f6/3413821438 RTSP/1.0
CSeq: 8
Session: 1
Content-Type: application/x-dmap-tagged
Content-Length: 3242
RTP-Info: rtptime=1146549156
User-Agent: iTunes/10.6 (Macintosh; Intel Mac OS X 10.7.3) AppleWebKit/535.18.5
Client-Instance: 56B29BB6CB904862
DACP-ID: 56B29BB6CB904862
Active-Remote: 1986535575
<DMAP DATA>
server → client
RTSP/1.0 200 OK
Server: AirTunes/130.14
CSeq: 8
Cover Artwork
Artworks are sent as JPEG pictures, with image/jpeg content type.
Example: send cover artwork
client → server
SET_PARAMETER rtsp://fe80::217:f2ff:fe0f:e0f6/3413821438 RTSP/1.0
CSeq: 9
Session: 1
Content-Type: image/jpeg
Content-Length: 34616
RTP-Info: rtptime=1146549156
User-Agent: iTunes/10.6 (Macintosh; Intel Mac OS X 10.7.3) AppleWebKit/535.18.5
Client-Instance: 56B29BB6CB904862
DACP-ID: 56B29BB6CB904862
Active-Remote: 1986535575
<JPEG DATA>
server → client
RTSP/1.0 200 OK
Server: AirTunes/130.14
CSeq: 9
Playback Progress
Playback progress is sent as text/parameters, with a progress parameter
representing three absolute RTP timestamps values:
start / curr / end.
| timestamp | description |
|---|---|
| start | beginning of the current track |
| curr | current playback position |
| end | end of the current track |
The relative position and track duration can be computed as follows:
position = rtptime_to_sec(curr - start)duration = rtptime_to_sec(end - start)
Example: send playback progress
client → server
SET_PARAMETER rtsp://fe80::217:f2ff:fe0f:e0f6/3413821438 RTSP/1.0
CSeq: 10
Session: 1
Content-Type: text/parameters
Content-Length: 44
User-Agent: iTunes/10.6 (Macintosh; Intel Mac OS X 10.7.3)
AppleWebKit/535.18.5
Client-Instance: 56B29BB6CB904862
DACP-ID: 56B29BB6CB904862
Active-Remote: 1986535575
progress: 1146221540/1146549156/1195701740
server → client
RTSP/1.0 200 OK
Server: AirTunes/130.14
CSeq: 10