--- /dev/null
+use nihav_core::codecs::*;
+use nihav_core::io::bitreader::*;
+
+const DICT_SIZE: usize = 4096;
+const START_BITS: u8 = 9;
+const MAX_BITS: u8 = 12;
+const START_POS: usize = 258;
+const INVALID_POS: usize = 65536;
+
+struct LZWState {
+ dict_sym: [u8; DICT_SIZE],
+ dict_prev: [u16; DICT_SIZE],
+ dict_pos: usize,
+ dict_lim: usize,
+ idx_bits: u8,
+}
+
+impl LZWState {
+ fn new() -> Self {
+ Self {
+ dict_sym: [0; DICT_SIZE],
+ dict_prev: [0; DICT_SIZE],
+ dict_pos: START_POS,
+ dict_lim: 1 << START_BITS,
+ idx_bits: START_BITS,
+ }
+ }
+ fn reset(&mut self) {
+ self.dict_pos = START_POS;
+ self.dict_lim = 1 << START_BITS;
+ self.idx_bits = START_BITS;
+ }
+ fn add(&mut self, prev: usize, sym: u8) {
+ if self.dict_pos < self.dict_lim {
+ self.dict_sym [self.dict_pos] = sym;
+ self.dict_prev[self.dict_pos] = prev as u16;
+ self.dict_pos += 1;
+ }
+ }
+ fn decode_idx(&self, dst: &mut [u8], pos: usize, idx: usize) -> DecoderResult<usize> {
+ let mut tot_len = 1;
+ let mut tidx = idx;
+ while tidx > 256 {
+ tidx = self.dict_prev[tidx] as usize;
+ tot_len += 1;
+ }
+ validate!(pos + tot_len <= dst.len());
+
+ let mut end = pos + tot_len - 1;
+ let mut tidx = idx;
+ while tidx > 256 {
+ dst[end] = self.dict_sym[tidx];
+ end -= 1;
+ tidx = self.dict_prev[tidx] as usize;
+ }
+ dst[end] = tidx as u8;
+
+ Ok(tot_len)
+ }
+ #[allow(clippy::comparison_chain)]
+ fn decode(&mut self, br: &mut BitReader, dst: &mut [u8]) -> DecoderResult<()> {
+ self.reset();
+
+ let mut pos = 0;
+ let mut lastidx = INVALID_POS;
+ loop {
+ let idx = br.read(self.idx_bits)? as usize;
+ if idx == 256 {
+ self.reset();
+ lastidx = INVALID_POS;
+ continue;
+ }
+ if idx == 257 {
+ break;
+ }
+ if idx < self.dict_pos {
+ let len = self.decode_idx(dst, pos, idx)?;
+ if lastidx != INVALID_POS {
+ self.add(lastidx, dst[pos]);
+ }
+ pos += len;
+ } else if idx == self.dict_pos {
+ validate!(lastidx != INVALID_POS);
+ let len = self.decode_idx(dst, pos, lastidx)?;
+ let lastsym = dst[pos];
+ pos += len;
+ validate!(pos < dst.len());
+ dst[pos] = lastsym;
+ pos += 1;
+ self.add(lastidx, lastsym);
+ } else {
+ return Err(DecoderError::InvalidData);
+ }
+ lastidx = idx;
+ if self.dict_pos == self.dict_lim && self.idx_bits < MAX_BITS {
+ self.dict_lim <<= 1;
+ self.idx_bits += 1;
+ }
+ }
+ validate!(pos == dst.len());
+ Ok(())
+ }
+}
+
+struct IPMADecoder {
+ info: NACodecInfoRef,
+ v1: bool,
+ pal: [u8; 768],
+ frame: Vec<u8>,
+ fframe: Vec<u8>,
+ dbuf: Vec<u8>,
+ width: usize,
+ height: usize,
+ first: bool,
+ lzw: LZWState,
+}
+
+impl IPMADecoder {
+ fn new(v1: bool) -> Self {
+ Self {
+ info: NACodecInfoRef::default(),
+ v1,
+ pal: [0; 768],
+ frame: Vec::new(),
+ fframe: Vec::new(),
+ dbuf: Vec::new(),
+ width: 0,
+ height: 0,
+ first: false,
+ lzw: LZWState::new(),
+ }
+ }
+}
+
+impl NADecoder for IPMADecoder {
+ fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
+ if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
+ self.width = vinfo.width;
+ self.height = vinfo.height;
+ self.frame = vec![0; self.width * self.height];
+ self.fframe = vec![0; self.width * self.height];
+ self.dbuf = vec![0; self.width * self.height];
+ self.pal = [0; 768];
+ let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(self.width, self.height, true, PAL8_FORMAT));
+ self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();
+
+ self.first = self.v1;
+
+ Ok(())
+ } else {
+ Err(DecoderError::InvalidData)
+ }
+ }
+ fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
+ let src = pkt.get_buffer();
+ validate!(src.len() > 0);
+
+ for sd in pkt.side_data.iter() {
+ if let NASideData::Palette(true, ref pal) = sd {
+ for (dst, src) in self.pal.chunks_mut(3).zip(pal.chunks(4)) {
+ dst[0] = src[0];
+ dst[1] = src[1];
+ dst[2] = src[2];
+ }
+ break;
+ }
+ }
+
+ let mut br = BitReader::new(&src, BitReaderMode::LE);
+ self.lzw.decode(&mut br, &mut self.dbuf)?;
+ if self.first {
+ self.fframe.copy_from_slice(&self.dbuf);
+ self.first = false;
+ }
+ for (dp, (&sp, &rp)) in self.frame.iter_mut().zip(self.dbuf.iter().zip(self.fframe.iter())) {
+ match sp {
+ 0 => {},
+ 1 => *dp = rp,
+ _ => *dp = sp,
+ };
+ }
+
+ let buf = alloc_video_buffer(self.info.get_properties().get_video_info().unwrap(), 0)?;
+ let mut vbuf = buf.get_vbuf().unwrap();
+ let paloff = vbuf.get_offset(1);
+ let stride = vbuf.get_stride(0);
+ let data = vbuf.get_data_mut().unwrap();
+
+ for (drow, srow) in data.chunks_mut(stride).zip(self.frame.chunks(self.width)) {
+ drow[..self.width].copy_from_slice(srow);
+ }
+ data[paloff..][..768].copy_from_slice(&self.pal);
+
+ let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), buf);
+ let ftype = if pkt.keyframe { FrameType::I } else { FrameType::P };
+ frm.set_frame_type(ftype);
+ Ok(frm.into_ref())
+ }
+ fn flush(&mut self) {
+ }
+}
+
+impl NAOptionHandler for IPMADecoder {
+ fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
+ fn set_options(&mut self, _options: &[NAOption]) { }
+ fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
+}
+
+pub fn get_decoder() -> Box<dyn NADecoder + Send> {
+ Box::new(IPMADecoder::new(true))
+}
+
+pub fn get_decoder_v2() -> Box<dyn NADecoder + Send> {
+ Box::new(IPMADecoder::new(false))
+}
+
+#[cfg(test)]
+mod test {
+ use nihav_core::codecs::RegisteredDecoders;
+ use nihav_core::demuxers::RegisteredDemuxers;
+ use nihav_codec_support::test::dec_video::*;
+ use crate::game_register_all_decoders;
+ use nihav_commonfmt::generic_register_all_demuxers;
+ #[test]
+ fn test_ipma_video() {
+ let mut dmx_reg = RegisteredDemuxers::new();
+ generic_register_all_demuxers(&mut dmx_reg);
+ let mut dec_reg = RegisteredDecoders::new();
+ game_register_all_decoders(&mut dec_reg);
+
+ test_decoding("avi", "ipma", "assets/Game/lripa07.avi",
+ Some(2), &dmx_reg, &dec_reg,
+ ExpectedTestResult::MD5Frames(vec![
+ [0x13a4e2e5, 0xeac494b1, 0xef107b9f, 0x1213bbc6],
+ [0x09e2684a, 0xe453ec76, 0xff1c3cee, 0xf38701c9],
+ [0xd39258b1, 0x2491b8d9, 0x37dd4415, 0x8ddb4669]]));
+ }
+ #[test]
+ fn test_ip20_video() {
+ let mut dmx_reg = RegisteredDemuxers::new();
+ generic_register_all_demuxers(&mut dmx_reg);
+ let mut dec_reg = RegisteredDecoders::new();
+ game_register_all_decoders(&mut dec_reg);
+
+ test_decoding("avi", "ipma2", "assets/Game/27mwza00.avi",
+ Some(2), &dmx_reg, &dec_reg,
+ ExpectedTestResult::MD5Frames(vec![
+ [0x8b000e62, 0x2e4e0344, 0x471e40ca, 0x7b9f83d4],
+ [0xc1429aa9, 0x3f2e856b, 0x80b27114, 0x25b5d453],
+ [0xfa24d5fa, 0x29bf2e17, 0x3cf5f550, 0x296e29b0]]));
+ }
+}
projects / nihav.git / commitdiff