Struct ProcessContext 

pub struct ProcessContext<'a> {
    pub sample_rate: f64,
    pub max_block_size: usize,
    pub transport: Option<TransportInfo>,
    pub output_events: &'a mut EventList,
}

Per-block context carrying host state into process and returning per-block side-channel data from it.

Plugins write outbound events (MIDI thru, parameter touches) into output_events; the wrapper drains them after the call returns. Hosts that don’t care about outbound events pass an empty list and ignore whatever the plugin pushes.

Fields

sample_rate: f64

Sample rate active for this block. Plugins should recompute coefficients when this changes between blocks (rare but legal — host sample-rate change without a full deactivate / activate cycle).

max_block_size: usize

Maximum frames the plugin was prepared for. The buffer’s num_frames() may be less; never more.

transport: Option<TransportInfo>

Host transport snapshot for this block. None when the host doesn’t expose transport (most CLAP hosts via the optional clap.transport extension only on hosts that support it).

output_events: &'a mut EventList

Outbound event sink the plugin pushes parameter touches / MIDI thru into. Cleared by the wrapper at the start of each block.