+use nihav_core::codecs::*;
+use nihav_core::io::bitreader::*;
+
+#[derive(Default)]
+struct TMRTDecoder {
+ info: Rc<NACodecInfo>,
+}
+
+const TMRT_DELTA_TAB: [&[i16]; 3] = [
+ &[ 5, -7, 36, -36 ],
+ &[ 2, -3, 8, -8, 18, -18, 36, -36 ],
+ &[ 1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144 ]
+];
+
+impl TMRTDecoder {
+ fn new() -> Self { Self::default() }
+ fn decode_plane(&self, br: &mut BitReader, dst: &mut [u8], mut off: usize, stride: usize, w: usize, h: usize, hscale: bool, dbits: u8, is_chroma: bool) -> DecoderResult<()> {
+ let delta_tab = TMRT_DELTA_TAB[(dbits - 2) as usize];
+ let step = if !hscale { 1 } else { 2 };
+ for y in 0..h {
+ let mut diff = 0;
+ for x in (0..w).step_by(step) {
+ let delta = delta_tab[br.read(dbits)? as usize];
+ diff += delta;
+ let pred = if y > 0 { dst[off + x - stride].into() } else if !is_chroma { 0 } else { 0x80 };
+ dst[off + x] = (pred + diff).min(255).max(0) as u8;
+ if hscale {
+ dst[off + x + 1] = dst[off + x];
+ }
+ }
+ off += stride;
+ }
+ Ok(())
+ }
+}
+
+impl NADecoder for TMRTDecoder {
+ fn init(&mut self, info: Rc<NACodecInfo>) -> DecoderResult<()> {
+ if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
+ let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(vinfo.get_width(), vinfo.get_height(), false, YUV410_FORMAT));
+ self.info = Rc::new(NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()));
+ Ok(())
+ } else {
+ Err(DecoderError::InvalidData)
+ }
+ }
+ fn decode(&mut self, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
+ let src = pkt.get_buffer();
+ validate!(src.len() > 10);
+ let hdr_size = (src[0].rotate_left(3) & 0x7F) as usize;
+ validate!(hdr_size >= 10 && hdr_size < src.len() - 4);
+ let mut hdr: [u8; 127] = [0; 127];
+ for i in 1..hdr_size {
+ hdr[i - 1] = src[i] ^ src[i + 1];
+ }
+ let dbits = hdr[1];
+ validate!(dbits >= 2 && dbits <= 4);
+ let hscale = hdr[3] != 0;
+ let width = (hdr[7] as usize) | ((hdr[8] as usize) << 8);
+ let height = (hdr[5] as usize) | ((hdr[6] as usize) << 8);
+
+ let myinfo = NAVideoInfo::new(width, height, false, YUV410_FORMAT);
+ let bufret = alloc_video_buffer(myinfo, 2);
+ if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
+ let mut bufinfo = bufret.unwrap();
+ let mut buf = bufinfo.get_vbuf().unwrap();
+
+ let mut br = BitReader::new(&src[hdr_size..], src.len() - hdr_size, BitReaderMode::LE);
+ let size = br.read(32)? as usize;
+ validate!(size <= src.len() - hdr_size);
+ for plane in 0..3 {
+ let (w, h) = buf.get_dimensions(plane);
+ let off = buf.get_offset(plane);
+ let stride = buf.get_stride(plane);
+ let mut data = buf.get_data_mut();
+ let dst = data.as_mut_slice();
+ self.decode_plane(&mut br, dst, off, stride, w, h, hscale, dbits, plane > 0)?;
+ }
+
+ let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), bufinfo);
+ frm.set_keyframe(true);
+ frm.set_frame_type(FrameType::I);
+ Ok(Rc::new(RefCell::new(frm)))
+ }
+}
+
+pub fn get_decoder() -> Box<NADecoder> {
+ Box::new(TMRTDecoder::new())
+}
+
+#[cfg(test)]
+mod test {
+ use nihav_core::codecs::RegisteredDecoders;
+ use nihav_core::demuxers::RegisteredDemuxers;
+ use nihav_core::test::dec_video::*;
+ use crate::codecs::duck_register_all_codecs;
+ use nihav_commonfmt::demuxers::generic_register_all_demuxers;
+ #[test]
+ fn test_tmrt() {
+ let mut dmx_reg = RegisteredDemuxers::new();
+ generic_register_all_demuxers(&mut dmx_reg);
+ let mut dec_reg = RegisteredDecoders::new();
+ duck_register_all_codecs(&mut dec_reg);
+
+ test_file_decoding("avi", "assets/Duck/tr20_low.avi", Some(10), true, false, None/*Some("tmrt")*/, &dmx_reg, &dec_reg);
+ }
+}