|audio_codecs| = set of all possible codecs that can be used, with correct payload type mappings |supported_audio_codecs| = set of codecs that are supported for the direction of this m= section acd->codecs() = set of previously negotiated codecs for this m= section The payload types should come from audio_codecs, but the order should come from acd->codecs() and then supported_codecs, to ensure
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