Struct DecoderPool

pub struct DecoderPool {
    backend: Backend,
    videos: HashMap<String, (u64, Option<Box<dyn VideoSource>>)>,
    audios: HashMap<(String, usize), (u64, Option<Box<dyn AudioSource>>)>,
    tick: u64,
    proxies: HashMap<String, String>,
}

Lazily opened decoders, one per (path) / (path, audio stream). Failed opens are remembered (None) so a missing file doesn’t re-spawn work every frame.

Fields

backend: Backend

videos: HashMap<String, (u64, Option<Box<dyn VideoSource>>)>

audios: HashMap<(String, usize), (u64, Option<Box<dyn AudioSource>>)>

tick: u64

Use counter for LRU eviction: a long timeline must not accumulate one live MF reader (or ffmpeg.exe child) per distinct file forever.

proxies: HashMap<String, String>

source path -> proxy file: preview decode opens the proxy instead of the original. Empty for export / one-shot pools, which must always read the real footage. Video only.

Implementations

impl DecoderPool

pub fn new(backend: Backend) -> Self

pub fn set_proxies(&mut self, map: HashMap<String, String>)

Swap the proxy map (drops every open decoder: cached paths may now resolve differently).

pub fn set_backend(&mut self, b: Backend)

pub fn video(&mut self, path: &str) -> Option<&mut (dyn VideoSource + 'static)>

pub fn audio( &mut self, path: &str, stream: usize, ) -> Option<&mut (dyn AudioSource + 'static)>

pub fn clear(&mut self)

Drop every decoder (releases file handles — required before overwriting a source file). Also forgets failed opens, so they are retried next time.