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use nihav_core::codecs::*;
use nihav_core::io::bitreader::*;
#[derive(Default)]
struct TMRTDecoder {
info: NACodecInfoRef,
}
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() }
#[allow(clippy::too_many_arguments)]
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, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> 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 = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();
Ok(())
} else {
Err(DecoderError::InvalidData)
}
}
fn decode(&mut self, _supp: &mut NADecoderSupport, 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 bufinfo = alloc_video_buffer(myinfo, 2)?;
let mut buf = bufinfo.get_vbuf().unwrap();
let mut br = BitReader::new(&src[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 data = buf.get_data_mut().unwrap();
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(frm.into_ref())
}
fn flush(&mut self) {
}
}
impl NAOptionHandler for TMRTDecoder {
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(TMRTDecoder::new())
}
#[cfg(test)]
mod test {
use nihav_core::codecs::RegisteredDecoders;
use nihav_core::demuxers::RegisteredDemuxers;
use nihav_codec_support::test::dec_video::*;
use crate::duck_register_all_decoders;
use nihav_commonfmt::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_decoders(&mut dec_reg);
// sample from a private collection
test_decoding("avi", "truemotionrt", "assets/Duck/tr20_low.avi", Some(10),
&dmx_reg, &dec_reg,
ExpectedTestResult::MD5([0x24c3d26c, 0x1e8bbdc4, 0xfb0fba5d, 0xaa04be81]));
}
}
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