[Spice-devel] Question about bidirectional audio

[Eduardo Hoefel]

Sorry for not being clear.


In this case, the client is Asterisk and the server is a SPICE server.

They want to send audio from the client to the server. The documentation 
says that I need to use
RED_RECORD_* messages. The server must start requesting the record from 
the client, with a RED_RECORD_START request. How can I trigger this 
request? One of the client's developers said that this message is sent 
from the server right after a link with connection type 
SPICE_CHANNEL_RECORD is made. Is this information true? I cannot find 
anywhere in the documentation how this communication starts.

On 10/10/19 3:22 PM, Frediano Ziglio wrote:
>> Hello,
>>
>> I'm a developer doing a freelance job for a company. They want to
>> connect Asterisk call center to a vm running Spice. I see that it's
>> possible to do Bidirectional Audio, according to your user manual.
>> I want to stream audio from a client to the server, and have that audio
>> played through the output device of the server. I need to make this code
>> in C.
>>
> Not clear here what the client and server are. Speaking about SPICE
> the server is the part attached to the VM while the client is usually
> a GUI client (like remote-viewer).
>
>> Looking at your protocol I saw that for audio messages the server always
>> needs to start the communication, either with RED_PLAYBACK_START or
>> RED_RECORD_START.
>>
> They are 2 separate channels which have one respective TCP connection
> (can be a Unix socket connection but in this case won't be remote).
> The playback channel is like, for the SPICE client, a speaker so the
> VM will send the audio to be played.
> The record channel is like, still for the client, a microphone so
> the client will send the audio to be recorder by the VM.
> The START messages are send from the VM either so say that the audio
> card is playing something (playback) or trying to record something
> (record)
>
>> My client wants to receive the call in the call center and have it
>> automatically streamed to the server. But I cannot start messaging
>> unless the server requests the connection.
>>
> What is the server here? It seems it's not SPICE server. It's not
> clear what you are trying to do. Where is executed Asterisk?
> And how is Asterisk involved here? Is it not possible to record on
> Asterisk (I suppose the calls are handled by Asterisk)?
>
>> How can I solve that?
>>
>> Regards,
>> Eduardo Hoefel
>>
> Frediano