src/codecs/mod.rs

   1 #[cfg(feature="decoder_indeo2")]
   2 pub mod indeo2;
   3
   4 use std::rc::Rc;
   5 use frame::*;
   6 use io::byteio::ByteIOError;
   7 use io::bitreader::BitReaderError;
   8 use io::codebook::CodebookError;
   9
  10 #[derive(Debug,Clone,Copy,PartialEq)]
  11 #[allow(dead_code)]
  12 pub enum DecoderError {
  13     InvalidData,
  14     ShortData,
  15     MissingReference,
  16     NotImplemented,
  17     Bug,
  18 }
  19
  20 type DecoderResult<T> = Result<T, DecoderError>;
  21
  22 impl From<ByteIOError> for DecoderError {
  23     fn from(_: ByteIOError) -> Self { DecoderError::ShortData }
  24 }
  25
  26 impl From<BitReaderError> for DecoderError {
  27     fn from(e: BitReaderError) -> Self {
  28         match e {
  29             BitReaderError::BitstreamEnd => DecoderError::ShortData,
  30             _ => DecoderError::InvalidData,
  31         }
  32     }
  33 }
  34
  35 impl From<CodebookError> for DecoderError {
  36     fn from(_: CodebookError) -> Self { DecoderError::InvalidData }
  37 }
  38
  39 pub trait NADecoder {
  40     fn init(&mut self, info: Rc<NACodecInfo>) -> DecoderResult<()>;
  41     fn decode(&mut self, pkt: &NAPacket) -> DecoderResult<Rc<NAFrame>>;
  42 }
  43
  44 #[derive(Clone,Copy)]
  45 pub struct DecoderInfo {
  46     name: &'static str,
  47     get_decoder: fn () -> Box<NADecoder>,
  48 }
  49
  50 const DECODERS: &[DecoderInfo] = &[
  51 #[cfg(feature="decoder_indeo2")]
  52     DecoderInfo { name: "indeo2", get_decoder: indeo2::get_decoder },
  53 ];
  54
  55 pub fn find_decoder(name: &str) -> Option<fn () -> Box<NADecoder>> {
  56     for &dec in DECODERS {
  57         if dec.name == name {
  58             return Some(dec.get_decoder);
  59         }
  60     }
  61     None
  62 }