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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 | } |