Struct TextSource 

pub struct TextSource { /* private fields */ }

Renders a TextSpec into a source-only rgba frame stream.

The output composites as a transparent overlay (text over a fully transparent canvas). Frames are produced sequentially via pull; the source exposes no seek, so a host that seeks rebuilds it. It is model-agnostic: it takes only a spec plus the target canvas size and frame rate.

Implementations

impl TextSource

pub fn new( spec: &TextSpec, width: u32, height: u32, fps: f64, ) -> Result<Self, FilterError>

Builds a text source for a width × height canvas at fps.

Errors

• FilterError::InvalidConfig when the text is empty.
• FilterError when the underlying FFmpeg graph cannot be built (e.g. color / drawtext filters are unavailable).

pub fn pull(&mut self) -> Result<Option<VideoFrame>, FilterError>

Pulls the next rendered frame (rgba), or None when none is buffered yet or at end-of-stream.

Errors

Returns FilterError on an unexpected FFmpeg error.