| 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..], src.len() - 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> { |
| 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::codecs::duck_register_all_codecs; |
| 97 | use nihav_commonfmt::demuxers::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_file_decoding("avi", "assets/Duck/tr20_low.avi", Some(10), true, false, None/*Some("tmrt")*/, &dmx_reg, &dec_reg); |
| 106 | } |
| 107 | } |