| 1 | use nihav_core::codecs::*; |
| 2 | use nihav_core::io::bitreader::*; |
| 3 | |
| 4 | const DICT_SIZE: usize = 4096; |
| 5 | const START_BITS: u8 = 9; |
| 6 | const MAX_BITS: u8 = 12; |
| 7 | const START_POS: usize = 258; |
| 8 | const INVALID_POS: usize = 65536; |
| 9 | |
| 10 | struct LZWState { |
| 11 | dict_sym: [u8; DICT_SIZE], |
| 12 | dict_prev: [u16; DICT_SIZE], |
| 13 | dict_pos: usize, |
| 14 | dict_lim: usize, |
| 15 | idx_bits: u8, |
| 16 | } |
| 17 | |
| 18 | impl LZWState { |
| 19 | fn new() -> Self { |
| 20 | Self { |
| 21 | dict_sym: [0; DICT_SIZE], |
| 22 | dict_prev: [0; DICT_SIZE], |
| 23 | dict_pos: START_POS, |
| 24 | dict_lim: 1 << START_BITS, |
| 25 | idx_bits: START_BITS, |
| 26 | } |
| 27 | } |
| 28 | fn reset(&mut self) { |
| 29 | self.dict_pos = START_POS; |
| 30 | self.dict_lim = 1 << START_BITS; |
| 31 | self.idx_bits = START_BITS; |
| 32 | } |
| 33 | fn add(&mut self, prev: usize, sym: u8) { |
| 34 | if self.dict_pos < self.dict_lim { |
| 35 | self.dict_sym [self.dict_pos] = sym; |
| 36 | self.dict_prev[self.dict_pos] = prev as u16; |
| 37 | self.dict_pos += 1; |
| 38 | } |
| 39 | } |
| 40 | fn decode_idx(&self, dst: &mut [u8], pos: usize, idx: usize) -> DecoderResult<usize> { |
| 41 | let mut tot_len = 1; |
| 42 | let mut tidx = idx; |
| 43 | while tidx > 256 { |
| 44 | tidx = self.dict_prev[tidx] as usize; |
| 45 | tot_len += 1; |
| 46 | } |
| 47 | validate!(pos + tot_len <= dst.len()); |
| 48 | |
| 49 | let mut end = pos + tot_len - 1; |
| 50 | let mut tidx = idx; |
| 51 | while tidx > 256 { |
| 52 | dst[end] = self.dict_sym[tidx]; |
| 53 | end -= 1; |
| 54 | tidx = self.dict_prev[tidx] as usize; |
| 55 | } |
| 56 | dst[end] = tidx as u8; |
| 57 | |
| 58 | Ok(tot_len) |
| 59 | } |
| 60 | #[allow(clippy::comparison_chain)] |
| 61 | fn decode(&mut self, br: &mut BitReader, dst: &mut [u8]) -> DecoderResult<()> { |
| 62 | self.reset(); |
| 63 | |
| 64 | let mut pos = 0; |
| 65 | let mut lastidx = INVALID_POS; |
| 66 | loop { |
| 67 | let idx = br.read(self.idx_bits)? as usize; |
| 68 | if idx == 256 { |
| 69 | self.reset(); |
| 70 | lastidx = INVALID_POS; |
| 71 | continue; |
| 72 | } |
| 73 | if idx == 257 { |
| 74 | break; |
| 75 | } |
| 76 | if idx < self.dict_pos { |
| 77 | let len = self.decode_idx(dst, pos, idx)?; |
| 78 | if lastidx != INVALID_POS { |
| 79 | self.add(lastidx, dst[pos]); |
| 80 | } |
| 81 | pos += len; |
| 82 | } else if idx == self.dict_pos { |
| 83 | validate!(lastidx != INVALID_POS); |
| 84 | let len = self.decode_idx(dst, pos, lastidx)?; |
| 85 | let lastsym = dst[pos]; |
| 86 | pos += len; |
| 87 | validate!(pos < dst.len()); |
| 88 | dst[pos] = lastsym; |
| 89 | pos += 1; |
| 90 | self.add(lastidx, lastsym); |
| 91 | } else { |
| 92 | return Err(DecoderError::InvalidData); |
| 93 | } |
| 94 | lastidx = idx; |
| 95 | if self.dict_pos == self.dict_lim && self.idx_bits < MAX_BITS { |
| 96 | self.dict_lim <<= 1; |
| 97 | self.idx_bits += 1; |
| 98 | } |
| 99 | } |
| 100 | validate!(pos == dst.len()); |
| 101 | Ok(()) |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | struct IPMADecoder { |
| 106 | info: NACodecInfoRef, |
| 107 | v1: bool, |
| 108 | pal: [u8; 768], |
| 109 | frame: Vec<u8>, |
| 110 | fframe: Vec<u8>, |
| 111 | dbuf: Vec<u8>, |
| 112 | width: usize, |
| 113 | height: usize, |
| 114 | first: bool, |
| 115 | lzw: LZWState, |
| 116 | } |
| 117 | |
| 118 | impl IPMADecoder { |
| 119 | fn new(v1: bool) -> Self { |
| 120 | Self { |
| 121 | info: NACodecInfoRef::default(), |
| 122 | v1, |
| 123 | pal: [0; 768], |
| 124 | frame: Vec::new(), |
| 125 | fframe: Vec::new(), |
| 126 | dbuf: Vec::new(), |
| 127 | width: 0, |
| 128 | height: 0, |
| 129 | first: false, |
| 130 | lzw: LZWState::new(), |
| 131 | } |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | impl NADecoder for IPMADecoder { |
| 136 | fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> { |
| 137 | if let NACodecTypeInfo::Video(vinfo) = info.get_properties() { |
| 138 | self.width = vinfo.width; |
| 139 | self.height = vinfo.height; |
| 140 | self.frame = vec![0; self.width * self.height]; |
| 141 | self.fframe = vec![0; self.width * self.height]; |
| 142 | self.dbuf = vec![0; self.width * self.height]; |
| 143 | self.pal = [0; 768]; |
| 144 | let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(self.width, self.height, true, PAL8_FORMAT)); |
| 145 | self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref(); |
| 146 | |
| 147 | self.first = self.v1; |
| 148 | |
| 149 | Ok(()) |
| 150 | } else { |
| 151 | Err(DecoderError::InvalidData) |
| 152 | } |
| 153 | } |
| 154 | fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> { |
| 155 | let src = pkt.get_buffer(); |
| 156 | validate!(src.len() > 0); |
| 157 | |
| 158 | for sd in pkt.side_data.iter() { |
| 159 | if let NASideData::Palette(true, ref pal) = sd { |
| 160 | for (dst, src) in self.pal.chunks_mut(3).zip(pal.chunks(4)) { |
| 161 | dst[0] = src[0]; |
| 162 | dst[1] = src[1]; |
| 163 | dst[2] = src[2]; |
| 164 | } |
| 165 | break; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | let mut br = BitReader::new(&src, BitReaderMode::LE); |
| 170 | self.lzw.decode(&mut br, &mut self.dbuf)?; |
| 171 | if self.first { |
| 172 | self.fframe.copy_from_slice(&self.dbuf); |
| 173 | self.first = false; |
| 174 | } |
| 175 | for (dp, (&sp, &rp)) in self.frame.iter_mut().zip(self.dbuf.iter().zip(self.fframe.iter())) { |
| 176 | match sp { |
| 177 | 0 => {}, |
| 178 | 1 => *dp = rp, |
| 179 | _ => *dp = sp, |
| 180 | }; |
| 181 | } |
| 182 | |
| 183 | let buf = alloc_video_buffer(self.info.get_properties().get_video_info().unwrap(), 0)?; |
| 184 | let mut vbuf = buf.get_vbuf().unwrap(); |
| 185 | let paloff = vbuf.get_offset(1); |
| 186 | let stride = vbuf.get_stride(0); |
| 187 | let data = vbuf.get_data_mut().unwrap(); |
| 188 | |
| 189 | for (drow, srow) in data.chunks_mut(stride).zip(self.frame.chunks(self.width)) { |
| 190 | drow[..self.width].copy_from_slice(srow); |
| 191 | } |
| 192 | data[paloff..][..768].copy_from_slice(&self.pal); |
| 193 | |
| 194 | let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), buf); |
| 195 | let ftype = if pkt.keyframe { FrameType::I } else { FrameType::P }; |
| 196 | frm.set_frame_type(ftype); |
| 197 | Ok(frm.into_ref()) |
| 198 | } |
| 199 | fn flush(&mut self) { |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | impl NAOptionHandler for IPMADecoder { |
| 204 | fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] } |
| 205 | fn set_options(&mut self, _options: &[NAOption]) { } |
| 206 | fn query_option_value(&self, _name: &str) -> Option<NAValue> { None } |
| 207 | } |
| 208 | |
| 209 | pub fn get_decoder() -> Box<dyn NADecoder + Send> { |
| 210 | Box::new(IPMADecoder::new(true)) |
| 211 | } |
| 212 | |
| 213 | pub fn get_decoder_v2() -> Box<dyn NADecoder + Send> { |
| 214 | Box::new(IPMADecoder::new(false)) |
| 215 | } |
| 216 | |
| 217 | #[cfg(test)] |
| 218 | mod test { |
| 219 | use nihav_core::codecs::RegisteredDecoders; |
| 220 | use nihav_core::demuxers::RegisteredDemuxers; |
| 221 | use nihav_codec_support::test::dec_video::*; |
| 222 | use crate::game_register_all_decoders; |
| 223 | use nihav_commonfmt::generic_register_all_demuxers; |
| 224 | // samples from https://misc.daniel-marschall.de/spiele/blown_away/ipma_codec/ |
| 225 | #[test] |
| 226 | fn test_ipma_video() { |
| 227 | let mut dmx_reg = RegisteredDemuxers::new(); |
| 228 | generic_register_all_demuxers(&mut dmx_reg); |
| 229 | let mut dec_reg = RegisteredDecoders::new(); |
| 230 | game_register_all_decoders(&mut dec_reg); |
| 231 | |
| 232 | test_decoding("avi", "ipma", "assets/Game/lripa07.avi", |
| 233 | Some(2), &dmx_reg, &dec_reg, |
| 234 | ExpectedTestResult::MD5Frames(vec![ |
| 235 | [0x13a4e2e5, 0xeac494b1, 0xef107b9f, 0x1213bbc6], |
| 236 | [0x09e2684a, 0xe453ec76, 0xff1c3cee, 0xf38701c9], |
| 237 | [0xd39258b1, 0x2491b8d9, 0x37dd4415, 0x8ddb4669]])); |
| 238 | } |
| 239 | #[test] |
| 240 | fn test_ip20_video() { |
| 241 | let mut dmx_reg = RegisteredDemuxers::new(); |
| 242 | generic_register_all_demuxers(&mut dmx_reg); |
| 243 | let mut dec_reg = RegisteredDecoders::new(); |
| 244 | game_register_all_decoders(&mut dec_reg); |
| 245 | |
| 246 | test_decoding("avi", "ipma2", "assets/Game/27mwza00.avi", |
| 247 | Some(2), &dmx_reg, &dec_reg, |
| 248 | ExpectedTestResult::MD5Frames(vec![ |
| 249 | [0x8b000e62, 0x2e4e0344, 0x471e40ca, 0x7b9f83d4], |
| 250 | [0xc1429aa9, 0x3f2e856b, 0x80b27114, 0x25b5d453], |
| 251 | [0xfa24d5fa, 0x29bf2e17, 0x3cf5f550, 0x296e29b0]])); |
| 252 | } |
| 253 | } |