| 1 | #[cfg(feature="decoder_indeo2")] |
| 2 | pub mod indeo2; |
| 3 | #[cfg(feature="decoder_pcm")] |
| 4 | pub mod pcm; |
| 5 | |
| 6 | use frame::*; |
| 7 | use std::rc::Rc; |
| 8 | use std::cell::RefCell; |
| 9 | use io::byteio::ByteIOError; |
| 10 | use io::bitreader::BitReaderError; |
| 11 | use io::codebook::CodebookError; |
| 12 | |
| 13 | #[derive(Debug,Clone,Copy,PartialEq)] |
| 14 | #[allow(dead_code)] |
| 15 | pub enum DecoderError { |
| 16 | InvalidData, |
| 17 | ShortData, |
| 18 | MissingReference, |
| 19 | NotImplemented, |
| 20 | Bug, |
| 21 | } |
| 22 | |
| 23 | type DecoderResult<T> = Result<T, DecoderError>; |
| 24 | |
| 25 | impl From<ByteIOError> for DecoderError { |
| 26 | fn from(_: ByteIOError) -> Self { DecoderError::ShortData } |
| 27 | } |
| 28 | |
| 29 | impl From<BitReaderError> for DecoderError { |
| 30 | fn from(e: BitReaderError) -> Self { |
| 31 | match e { |
| 32 | BitReaderError::BitstreamEnd => DecoderError::ShortData, |
| 33 | _ => DecoderError::InvalidData, |
| 34 | } |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | impl From<CodebookError> for DecoderError { |
| 39 | fn from(_: CodebookError) -> Self { DecoderError::InvalidData } |
| 40 | } |
| 41 | |
| 42 | #[allow(dead_code)] |
| 43 | struct HAMShuffler { |
| 44 | lastframe: Option<NAVideoBuffer<u8>>, |
| 45 | } |
| 46 | |
| 47 | impl HAMShuffler { |
| 48 | #[allow(dead_code)] |
| 49 | fn new() -> Self { HAMShuffler { lastframe: None } } |
| 50 | #[allow(dead_code)] |
| 51 | fn clear(&mut self) { self.lastframe = None; } |
| 52 | #[allow(dead_code)] |
| 53 | fn add_frame(&mut self, buf: NAVideoBuffer<u8>) { |
| 54 | self.lastframe = Some(buf); |
| 55 | } |
| 56 | #[allow(dead_code)] |
| 57 | fn clone_ref(&mut self) -> Option<NAVideoBuffer<u8>> { |
| 58 | if let Some(ref mut frm) = self.lastframe { |
| 59 | let newfrm = frm.copy_buffer(); |
| 60 | *frm = newfrm.clone(); |
| 61 | Some(newfrm) |
| 62 | } else { |
| 63 | None |
| 64 | } |
| 65 | } |
| 66 | #[allow(dead_code)] |
| 67 | fn get_output_frame(&mut self) -> Option<NAVideoBuffer<u8>> { |
| 68 | match self.lastframe { |
| 69 | Some(ref frm) => Some(frm.clone()), |
| 70 | None => None, |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | pub trait NADecoder { |
| 76 | fn init(&mut self, info: Rc<NACodecInfo>) -> DecoderResult<()>; |
| 77 | fn decode(&mut self, pkt: &NAPacket) -> DecoderResult<NAFrameRef>; |
| 78 | } |
| 79 | |
| 80 | #[derive(Clone,Copy)] |
| 81 | pub struct DecoderInfo { |
| 82 | name: &'static str, |
| 83 | get_decoder: fn () -> Box<NADecoder>, |
| 84 | } |
| 85 | |
| 86 | const DECODERS: &[DecoderInfo] = &[ |
| 87 | #[cfg(feature="decoder_indeo2")] |
| 88 | DecoderInfo { name: "indeo2", get_decoder: indeo2::get_decoder }, |
| 89 | #[cfg(feature="decoder_pcm")] |
| 90 | DecoderInfo { name: "pcm", get_decoder: pcm::get_decoder }, |
| 91 | ]; |
| 92 | |
| 93 | pub fn find_decoder(name: &str) -> Option<fn () -> Box<NADecoder>> { |
| 94 | for &dec in DECODERS { |
| 95 | if dec.name == name { |
| 96 | return Some(dec.get_decoder); |
| 97 | } |
| 98 | } |
| 99 | None |
| 100 | } |