On some (most?) audio hosts, audio flows through the plugin even when playback is not active, and processBlock receives silent samples during this time (or, I believe, live audio samples if the track is armed for record). When playback starts, processBlock starts receiving pre-recorded samples from audio clips on that track, so there is some point where the host switches from passing “silent” samples to “pre recorded” samples into the plugin. I am trying to find that point in the incoming stream. Some hosts, like Reaper, seem to always precede the start of audio playback with a prepareToPlay, and the next processBlock after that is the sample I am looking for, so that case is fine. But other hosts, like Pro Tools, rarely precede audio playback with prepareToPlay, and so it is this case that I am struggling with. I can detect playback with AudioPlayHead, but the state transition from !isPlaying to isPlaying does not seem to line up with the sample I am looking for. It seems like an important point in the stream, is there a way to detect it? Thanks in advance.
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