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8. Audio IO
8.2.2
Setting up Streams
Audio is streamed from POWER CORE to the network according to the RAVENNA audio output settings defined
in the system configuration. This means that once a suitable configuration is loaded to the system, audio will be
streamed automatically whenever POWER CORE is connected to the network and powered.
To prepare some output streams, edit the system configuration as follows:
1.
Open the "Audio Output" branch of the 'Tree Definition', and select one of the RAVENNA Out tabs.
Note that the number of channels available is dependent on the POWER CORE license. At maximum capacity,
up to 256 channels of audio can be broadcast on 128 streams.
Note that streams can be transmitted from either or both
2.
All outputs that have a name entered into the Name field will be transmitted automatically as streams,
while the other parameters configure the output's audio options and stream setup.
The first few fields: Name, Type, Dig Offset Gain, Matrix enable, Transparent and Default Audio are handled
in an identical manner to other outputs. See
The RAVENNA parameters: Stream Size, Codec, SampPerFrm, Devices, IP Addresses, mDNS, SAP, TTL,
etc. define the stream setup.
The important fields are:
·
Name - a name must be entered in order to publish the output stream to the network. The maximum
length is 8 characters. If the stream is to be displayed on another ruby surface in a channel list, then the
stream name must use the format [GroupName]:[SignalName], where each label field is a maximum of 8
characters. See
RAVENNA Pool Sources
·
Type - defines the format of the output: mono, stereo, etc. This should match the Stream Size.
·
Matrix enable - by turning ON the Matrix Enable option, the output can be controlled by a matrix.
·
Default Audio - alternatively, if Matrix Enable is OFF, a permanent audio source can be assigned to
the output. Note that the Default Audio setting is ignored when Matrix Enable is ON.
·
Stream Size - defines the number of audio channels used by the stream. This should match the audio
output format (Type).
·
Codec - select the type of codec to use for the stream: Linear, 16, 24 or 32 bits; or AM824 (a
packetized AES signal that includes all user and status bits).
·
SampPerFrm - sets the number of samples included in each Ethernet Frame. A frame is the payload
being carried over the Ethernet link. This is typically set to 32.
·
Devices - select which port to send the stream out on: ra0, ra1 or both ra0 + ra1 (Hitless Merge SMTPE
2022-7).
POWER CORE User Manual
front panel
'Tree Definition': Audio Output -> RAVENNA 1-64
MADI Signal Parameters
for details.
Version: V6.0.0/5
ports (ra0 and ra1).
for details.
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