# Stub for resemble-perth audio watermarking.
# Watermarking is unnecessary for self-hosted/private deployments.
# This stub satisfies chatterbox's import without the build complexity.

class PerthImplicitWatermarker:
    def apply_watermark(self, audio, sample_rate):
        return audio

class PerthImperceptibleWatermarker:
    def apply_watermark(self, audio, sample_rate):
        return audio