[asterisk-dev] bridge_builtin_features.c playback to both channels in bridge

[Steve Davies]

Amazing, clear answer. Thank you so much Richard. That documentation link
is also very helpful.

Regards,
Steve

On Mon, 20 Nov 2017 at 17:56 Richard Mudgett <rmudgett at digium.com> wrote:

> On Mon, Nov 20, 2017 at 7:03 AM, Steve Davies <davies147 at gmail.com> wrote:
>
>> Hi,
>>
>> Perhaps the answer to this will be pointing me at some documentation -
>> That is fine, but I've failed to find it so far, so forgive me if the
>> following is a dumb question.
>>
>> With Asterisk-11 I added a built-in feature which allowed a very
>> customised version of stopping call recording on a bridge, playing back
>> different messages to each channel, and so forth based on some channel
>> variables, and depending whether the feature was enabled per channel.
>>
>> I want to port this to Asterisk-15, but am struggling to understand the
>> new bridge playback methods. I variously see
>> ast_bridge_channel_queue_playfile(), ast_bridge_channel_write_playfile(),
>> or even one followed by the other.
>>
>> What I'd like to do is queue playback message(s) to both halves of a
>> bridge simultaneously so that the bridge will resume once all messages on
>> both channels are complete.
>>
>> An a first read-through, I was fairly convinced that I would be able to
>> just call ast_bridge_channel_queue_playfile() as many times as needed on
>> both the bridge, and peer channels, and magic would happen, until I saw the
>> code in bridges/bridge_builtin_features.c: start_automixmonitor(), after
>> which I became most confused :)
>>
>> Help please?
>>
>
> Reaching across the bridge is not allowed.  A channel in a bridge is not
> supposed to know
> who it is exchanging frames with because the channel could be exchanging
> frames with zero
> or more other channels at any given time.  Over time, the participant
> channels in the bridge
> could change.  Channels could be added, removed, or swapped with other
> channels in the bridge.
>
> ast_bridge_channel_queue_playfile() - This function queues the playfile
> onto the channel itself
> for the channel to play the file.
>
> ast_bridge_channel_write_playfile() - This function puts the playfile
> request into the bridge for
> the other channels in the bridge to play the file.  The bridge handles
> distributing the request to
> all other channels in the bridge according to the bridge technology.
>
> More information can be found here [1].
>
> Richard
>
> [1]
> https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+Bridging+Project
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