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When using speed adjustment it was possible for playback to get stuck at a period transition when the channel count changed: SonicAudioProcessor would be drained at the point of the period transition in preparation for creating a new AudioTrack with the new channel count, but during draining the incorrect (new) channel count was used to calculate the output buffer size for pending data from Sonic. This meant that, for example, if the channel count changed from stereo to mono we could have an output buffer size that stored an non-integer number of audio frames, and in turn this would cause writing to the AudioTrack to get stuck as the AudioTrack would prevent writing a partial audio frame. Use Sonic's current channel count when draining output to fix the issue. PiperOrigin-RevId: 260156541