Struct SwDecoder 

pub struct SwDecoder { /* private fields */ }

Decodes one stream’s Packets into Frames in software (plain libavcodec, no hardware acceleration). A Filter: receives via Sink, pushes what it produces into its own (single) src pad.

One packet can turn into zero, one, or several frames (B-frame reordering, decoder buffering, …) — consume just drains receive_frame in a loop after every send_packet/send_eof, pushing however many frames come out.

Implementations

impl SwDecoder

pub fn new( name: impl Into<String>, params: Parameters, ) -> Result<Self, SwDecoderError>

params should come from the stream you want to decode — see crate::elements::FileDemuxer::stream_parameters.

Trait Implementations

impl Element for SwDecoder

fn name(&self) -> Arc<str>

Returns a cheap clone (refcount bump, not a deep copy) of this element’s name — crate::bus::BusEvent stores names as Arc<str> for exactly this reason: a hot path like crate::queue::Queue posting BusEvent::Dropped once per overflowed buffer shouldn’t pay for a fresh heap allocation every time it wants to report which element it is.

fn element_type(&self) -> ElementType

See ElementType.

fn pp_log(&self) -> &PpLog

This element’s identity for crate::bus::Bus::post — same id/name as Element::name, just already wrapped as the crate::pp_log::PpLog its pp_info!/pp_warn!/pp_error! macros need. A stored private field, not built fresh per call, for the same reason name() returns a cheap Arc<str> clone instead of a fresh String — see its own docs.

fn pp_log_mut(&mut self) -> &mut PpLog

Mutable access to the same field Element::pp_log reads — used by crate::pipeline::ChainBuilder to stamp the owning crate::pipeline::Pipeline’s id onto every element that passes through it, via element_pp_log. Not meant to be called from anywhere else.

fn graph_id(&self) -> Option<ElementId>

A pre-reserved graph identity for elements that expose dynamic attachment handles. Most elements receive an ID from ChainBuilder and keep the default None implementation.

impl Sink for SwDecoder

fn consume(&mut self, buf: MediaBuffer) -> Result<()>

fn control(&mut self, msg: ControlMsg) -> Result<()>

Reacts to a ControlMsg (pause/resume/stop) and, for anything with a downstream of its own, forwards it on — same shape as consume, just a separate channel from MediaBuffer so it can reach every element (not just ones that already know how to interpret a data buffer) and, at a crate::queue::Queue, jump ahead of whatever data is backed up instead of waiting behind it. No default: every Sink has to consciously decide what this means for it, rather than silently dropping it.

impl Source for SwDecoder

fn src_pads(&mut self) -> &mut [SrcPad]