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1 | use nihav_core::demuxers::*; | |
2 | ||
3 | struct GIFDemuxer<'a> { | |
4 | src: &'a mut ByteReader<'a>, | |
5 | frameno: u64, | |
6 | is_87: bool, | |
7 | pal: Arc<[u8; 1024]>, | |
8 | } | |
9 | ||
10 | impl<'a> GIFDemuxer<'a> { | |
11 | fn new(io: &'a mut ByteReader<'a>) -> Self { | |
12 | Self { | |
13 | src: io, | |
14 | frameno: 0, | |
15 | is_87: false, | |
16 | pal: Arc::new([0; 1024]), | |
17 | } | |
18 | } | |
19 | fn skip_blocks(&mut self) -> DemuxerResult<()> { | |
20 | loop { | |
21 | let size = self.src.read_byte()?; | |
22 | if size == 0 { | |
23 | break; | |
24 | } | |
25 | self.src.read_skip(usize::from(size))?; | |
26 | } | |
27 | Ok(()) | |
28 | } | |
29 | } | |
30 | ||
31 | impl<'a> DemuxCore<'a> for GIFDemuxer<'a> { | |
32 | fn open(&mut self, strmgr: &mut StreamManager, _seek_index: &mut SeekIndex) -> DemuxerResult<()> { | |
33 | let mut magic = [0; 6]; | |
34 | self.src.read_buf(&mut magic)?; | |
35 | validate!(&magic == b"GIF87a" || &magic == b"GIF89a"); | |
36 | self.is_87 = &magic == b"GIF87a"; | |
37 | ||
38 | let width = usize::from(self.src.read_u16le()?); | |
39 | let height = usize::from(self.src.read_u16le()?); | |
40 | validate!(width > 0 && height > 0); | |
41 | let flags = self.src.read_byte()?; | |
42 | let edata_size = 1 + 2 + if (flags & 0x80) != 0 { 3 << ((flags & 7) + 1) } else { 0 }; | |
43 | let mut edata = vec![0; edata_size]; | |
44 | edata[0] = flags; | |
45 | self.src.read_buf(&mut edata[1..])?; | |
46 | if (flags & 0x80) != 0 { | |
47 | let mut npal = [0; 1024]; | |
48 | for (dpal, spal) in npal.chunks_exact_mut(4).zip(edata[3..].chunks_exact(3)) { | |
49 | dpal[..3].copy_from_slice(spal); | |
50 | } | |
51 | self.pal = Arc::new(npal); | |
52 | } | |
53 | let mut delay = 0; | |
54 | loop { | |
55 | match self.src.peek_byte() { | |
56 | Ok(0x2C) => break, | |
57 | Ok(_) => {}, | |
58 | Err(_err) => return Err(DemuxerError::IOError), | |
59 | }; | |
60 | let tag = self.src.read_byte()?; | |
61 | match tag { | |
62 | 0x21 => { | |
63 | validate!(!self.is_87); | |
64 | let subtype = self.src.read_byte()?; | |
65 | match subtype { | |
66 | 0xF9 => { | |
67 | let bsize = self.src.read_byte()?; | |
68 | validate!(bsize == 4); | |
69 | let _flags = self.src.read_byte()?; | |
70 | delay = self.src.read_u16le()?; | |
71 | let _clr = self.src.read_byte()?; | |
72 | self.skip_blocks()?; | |
73 | }, | |
74 | 0xFF => { | |
75 | let bsize = self.src.read_byte()?; | |
76 | validate!(bsize == 11); | |
77 | let mut app_id = [0; 11]; | |
78 | self.src.read_buf(&mut app_id)?; | |
79 | if &app_id == b"NETSCAPE2.0" { | |
80 | let bsize = self.src.read_byte()?; | |
81 | validate!(bsize == 3); | |
82 | let b = self.src.read_byte()?; | |
83 | validate!(b == 1); | |
84 | let _nloops = self.src.read_u16le()?; | |
85 | } | |
86 | self.skip_blocks()?; | |
87 | }, | |
88 | _ => { | |
89 | self.skip_blocks()?; | |
90 | }, | |
91 | }; | |
92 | }, | |
93 | 0x2C => unreachable!(), | |
94 | _ => return Err(DemuxerError::NotImplemented), | |
95 | }; | |
96 | } | |
97 | ||
98 | let vhdr = NAVideoInfo::new(width, height, false, PAL8_FORMAT); | |
99 | let vci = NACodecTypeInfo::Video(vhdr); | |
100 | let vinfo = NACodecInfo::new("gif", vci, Some(edata)); | |
101 | if strmgr.add_stream(NAStream::new(StreamType::Video, 0, vinfo, u32::from(delay.max(1)), 100, 0)).is_none() { | |
102 | return Err(DemuxerError::MemoryError); | |
103 | } | |
104 | ||
105 | Ok(()) | |
106 | } | |
107 | ||
108 | fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> { | |
109 | loop { | |
110 | match self.src.read_byte()? { | |
111 | 0x2C => { | |
112 | let mut data = vec![0; 10]; | |
113 | data[0] = 0x2C; | |
114 | self.src.read_buf(&mut data[1..])?; | |
115 | if (data[9] & 0x80) != 0 { | |
116 | let cmap_size = 3 << ((data[9] & 7) + 1); | |
117 | data.resize(10 + cmap_size, 0); | |
118 | self.src.read_buf(&mut data[10..])?; | |
119 | } | |
120 | let lzw_bits = self.src.read_byte()?; | |
121 | data.push(lzw_bits); | |
122 | let mut tbuf = [0; 255]; | |
123 | loop { | |
124 | let bsize = usize::from(self.src.read_byte()?); | |
125 | data.push(bsize as u8); | |
126 | if bsize == 0 { | |
127 | break; | |
128 | } | |
129 | self.src.read_buf(&mut tbuf[..bsize])?; | |
130 | data.extend_from_slice(&tbuf[..bsize]); | |
131 | } | |
132 | ||
133 | let stream = strmgr.get_stream(0).unwrap(); | |
134 | let ts = stream.make_ts(Some(self.frameno), None, None); | |
135 | let mut pkt = NAPacket::new(stream, ts, self.frameno == 0, data); | |
136 | pkt.add_side_data(NASideData::Palette(false, self.pal.clone())); | |
137 | self.frameno += 1; | |
138 | return Ok(pkt); | |
139 | }, | |
140 | 0x21 => { | |
141 | self.src.read_byte()?; | |
142 | self.skip_blocks()?; | |
143 | }, | |
144 | 0x3B => return Err(DemuxerError::EOF), | |
145 | _ => unimplemented!(), | |
146 | }; | |
147 | } | |
148 | } | |
149 | ||
150 | fn seek(&mut self, _time: NATimePoint, _seek_index: &SeekIndex) -> DemuxerResult<()> { | |
151 | Err(DemuxerError::NotPossible) | |
152 | } | |
153 | fn get_duration(&self) -> u64 { 0 } | |
154 | } | |
155 | ||
156 | impl<'a> NAOptionHandler for GIFDemuxer<'a> { | |
157 | fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] } | |
158 | fn set_options(&mut self, _options: &[NAOption]) { } | |
159 | fn query_option_value(&self, _name: &str) -> Option<NAValue> { None } | |
160 | } | |
161 | ||
162 | pub struct GIFDemuxerCreator { } | |
163 | ||
164 | impl DemuxerCreator for GIFDemuxerCreator { | |
165 | fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> { | |
166 | Box::new(GIFDemuxer::new(br)) | |
167 | } | |
168 | fn get_name(&self) -> &'static str { "gif" } | |
169 | } | |
170 | ||
171 | #[cfg(test)] | |
172 | mod test { | |
173 | use super::*; | |
174 | use std::fs::File; | |
175 | ||
176 | #[test] | |
177 | fn test_gif_demux() { | |
178 | // sample: https://samples.mplayerhq.hu/image-samples/GIF/3D.gif | |
179 | let mut file = File::open("assets/Misc/3D.gif").unwrap(); | |
180 | let mut fr = FileReader::new_read(&mut file); | |
181 | let mut br = ByteReader::new(&mut fr); | |
182 | let mut dmx = GIFDemuxer::new(&mut br); | |
183 | let mut sm = StreamManager::new(); | |
184 | let mut si = SeekIndex::new(); | |
185 | dmx.open(&mut sm, &mut si).unwrap(); | |
186 | ||
187 | loop { | |
188 | let pktres = dmx.get_frame(&mut sm); | |
189 | if let Err(e) = pktres { | |
190 | if e == DemuxerError::EOF { break; } | |
191 | panic!("error"); | |
192 | } | |
193 | let pkt = pktres.unwrap(); | |
194 | println!("Got {}", pkt); | |
195 | } | |
196 | } | |
197 | } |