Add support for sending voice messages

[marczeugs]

As documented in the documentation bots can send voice messages by using the IS_VOICE_MESSAGE flag and setting duration_secs and waveform on audio attachments.

The voice message flag is available, but the AttachmentBuilder/AttachmentRequest classes are missing the necessary duration_secs and waveform fields.

[DRSchlaubi]

To me that documentation doesn't say that bots can send voice message, did I mess something

• The last time I checked requests failed with this error
• The waveform field is required, however it is not documented what it actually contains

[gdude2002]

As discussed on Discord, sending voice notes works just fine once you get the data figured out.

The only tricky part is calculating the waveform, but that's based on the audio data - Kord probably shouldn't be responsible for calculating it.

[gdude2002]

Oh, and as for what the waveform data actually is - it's one byte per point, so it's probably just volume?

[DRSchlaubi]

I don't think we should add this before Discord officially supports it

Oh, and as for what the waveform data actually is - it's one byte per point, so it's probably just volume?

Always assumed it's something with volume yes

[marczeugs]

What counts as officially supporting it? I assumed that because the documentation explains the necessary fields, it is more or less supported?

[gdude2002]

I don't see why Kord shouldn't expose this API, seems pretty easy to implement from a library perspective and it's already fully documented.

If Kord decides against this, I'll look into supporting it in KordEx.

[DRSchlaubi]

It is in fact not documented, what is documented is receiving voice messages, as mentioned in https://github.com/discord/discord-api-docs/pull/6082 and as in the documentation you linked being part of the "get channel message" section

Sending voice messages is documented nowhere