nihav-duck/src/codecs/truemotionrt.rs

   1 use nihav_core::codecs::*;
   2 use nihav_core::io::bitreader::*;
   3
   4 #[derive(Default)]
   5 struct TMRTDecoder {
   6     info:       NACodecInfoRef,
   7 }
   8
   9 const TMRT_DELTA_TAB: [&[i16]; 3] = [
  10     &[ 5, -7, 36, -36 ],
  11     &[ 2, -3, 8, -8, 18, -18, 36, -36 ],
  12     &[ 1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144 ]
  13 ];
  14
  15 impl TMRTDecoder {
  16     fn new() -> Self { Self::default() }
  17     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<()> {
  18         let delta_tab = TMRT_DELTA_TAB[(dbits - 2) as usize];
  19         let step = if !hscale { 1 } else { 2 };
  20         for y in 0..h {
  21             let mut diff = 0;
  22             for x in (0..w).step_by(step) {
  23                 let delta                       = delta_tab[br.read(dbits)? as usize];
  24                 diff += delta;
  25                 let pred = if y > 0 { dst[off + x - stride].into() } else if !is_chroma { 0 } else { 0x80 };
  26                 dst[off + x] = (pred + diff).min(255).max(0) as u8;
  27                 if hscale {
  28                     dst[off + x + 1] = dst[off + x];
  29                 }
  30             }
  31             off += stride;
  32         }
  33         Ok(())
  34     }
  35 }
  36
  37 impl NADecoder for TMRTDecoder {
  38     fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
  39         if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
  40             let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(vinfo.get_width(), vinfo.get_height(), false, YUV410_FORMAT));
  41             self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();
  42             Ok(())
  43         } else {
  44             Err(DecoderError::InvalidData)
  45         }
  46     }
  47     fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
  48         let src = pkt.get_buffer();
  49         validate!(src.len() > 10);
  50         let hdr_size = (src[0].rotate_left(3) & 0x7F) as usize;
  51         validate!(hdr_size >= 10 && hdr_size < src.len() - 4);
  52         let mut hdr: [u8; 127] = [0; 127];
  53         for i in 1..hdr_size {
  54             hdr[i - 1] = src[i] ^ src[i + 1];
  55         }
  56         let dbits  = hdr[1];
  57         validate!(dbits >= 2 && dbits <= 4);
  58         let hscale = hdr[3] != 0;
  59         let width  = (hdr[7] as usize) | ((hdr[8] as usize) << 8);
  60         let height = (hdr[5] as usize) | ((hdr[6] as usize) << 8);
  61
  62         let myinfo = NAVideoInfo::new(width, height, false, YUV410_FORMAT);
  63         let bufinfo = alloc_video_buffer(myinfo, 2)?;
  64         let mut buf = bufinfo.get_vbuf().unwrap();
  65
  66         let mut br = BitReader::new(&src[hdr_size..], BitReaderMode::LE);
  67         let size                                = br.read(32)? as usize;
  68         validate!(size <= src.len() - hdr_size);
  69         for plane in 0..3 {
  70             let (w, h)  = buf.get_dimensions(plane);
  71             let off     = buf.get_offset(plane);
  72             let stride  = buf.get_stride(plane);
  73             let data = buf.get_data_mut().unwrap();
  74             let dst = data.as_mut_slice();
  75             self.decode_plane(&mut br, dst, off, stride, w, h, hscale, dbits, plane > 0)?;
  76         }
  77
  78         let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), bufinfo);
  79         frm.set_keyframe(true);
  80         frm.set_frame_type(FrameType::I);
  81         Ok(frm.into_ref())
  82     }
  83     fn flush(&mut self) {
  84     }
  85 }
  86
  87 pub fn get_decoder() -> Box<dyn NADecoder + Send> {
  88     Box::new(TMRTDecoder::new())
  89 }
  90
  91 #[cfg(test)]
  92 mod test {
  93     use nihav_core::codecs::RegisteredDecoders;
  94     use nihav_core::demuxers::RegisteredDemuxers;
  95     use nihav_core::test::dec_video::*;
  96     use crate::duck_register_all_codecs;
  97     use nihav_commonfmt::generic_register_all_demuxers;
  98     #[test]
  99     fn test_tmrt() {
 100         let mut dmx_reg = RegisteredDemuxers::new();
 101         generic_register_all_demuxers(&mut dmx_reg);
 102         let mut dec_reg = RegisteredDecoders::new();
 103         duck_register_all_codecs(&mut dec_reg);
 104
 105         test_decoding("avi", "truemotionrt", "assets/Duck/tr20_low.avi", Some(10),
 106                         &dmx_reg, &dec_reg,
 107                         ExpectedTestResult::MD5([0x24c3d26c, 0x1e8bbdc4, 0xfb0fba5d, 0xaa04be81]));
 108     }
 109 }