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refactor(voice): Strict type checking in voice internals & DAVE Support (rec)#3159

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fix/voice-rec-2
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refactor(voice): Strict type checking in voice internals & DAVE Support (rec)#3159
Paillat-dev wants to merge 34 commits into
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fix/voice-rec-2

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Summary

Information

  • This PR fixes an issue.
  • This PR adds something new (e.g. new method or parameters).
  • This PR is a breaking change (e.g. methods or parameters removed/renamed).
  • This PR is not a code change (e.g. documentation, README, typehinting,
    examples, ...).

Checklist

  • I have searched the open pull requests for duplicates.
  • If code changes were made then they have been tested.
    • I have updated the documentation to reflect the changes.
  • If type: ignore comments were used, a comment is also left explaining why.
  • I have updated the changelog to include these changes.
  • AI Usage has been disclosed.
    • If AI has been used, I understand fully what the code does

Discord enforces DAVE (E2E encryption) on all voice channels. py-cord
currently decodes Opus packets before stripping the DAVE application-layer
encryption, causing OpusError: corrupted stream and making voice reception
completely non-functional.

Changes:
- reader.py: Rewrite decrypt_rtp() to call dave.decrypt() BEFORE Opus
  decoding. Handles SSRC-to-user_id race condition by trying all known
  DAVE user IDs when the mapping is not yet populated, then caching the
  result. Falls back to OPUS_SILENCE on decrypt failure.
- opus.py: Remove erroneous dave.decrypt() call in _decode_packet() that
  was applied to already-decoded PCM data, corrupting the audio stream.
- router.py: Catch OpusError and AssertionError in _do_run() gracefully,
  emitting a single warning instead of crashing the router thread.

Fixes: #3139
@pycord-app

pycord-app Bot commented Mar 19, 2026

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Thanks for opening this pull request!
Please make sure you have read the Contributing Guidelines and Code of Conduct.

This pull request can be checked-out with:

git fetch origin pull/3159/head:pr-3159
git checkout pr-3159

This pull request can be installed with:

pip install git+https://github.com/Pycord-Development/pycord@refs/pull/3159/head

@Paillat-dev Paillat-dev added this to the Next minor rc1 milestone Mar 19, 2026
Comment thread discord/voice/client.py
Comment thread discord/voice/client.py Outdated
Comment thread discord/sinks/wave.py Outdated
Comment thread discord/voice/receive/reader.py Outdated
Comment thread discord/voice/receive/router.py

@Paillat-dev Paillat-dev left a comment

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changeling

@brianmatzelle

brianmatzelle commented Apr 15, 2026

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thank you for this change <3

can't wait for it to get in

@Lulalaby Lulalaby linked an issue Apr 27, 2026 that may be closed by this pull request

@Snazzah Snazzah left a comment

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PR looks good in terms of handling DAVE for recieving, just two nits.

Comment thread discord/voice/receive/reader.py Outdated
Comment thread examples/audio_recording.py Outdated
@Paillat-dev Paillat-dev modified the milestones: 2.9.0, 2.9.0rc1 May 22, 2026
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Labels

dependencies Pull requests that update a dependency file feature Implements a feature help wanted Extra attention is needed hold: testing This pull request requires further testing priority: medium Medium Priority status: in progress Work in Progess voice Related to the voice chat feature

Projects

Status: Todo

9 participants