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use nihav_core::codecs::*;
use nihav_core::io::byteio::*;
use nihav_codec_support::codecs::HAMShuffler;
#[derive(Default)]
struct MidividDecoder {
info: NACodecInfoRef,
hams: HAMShuffler<u8>,
lzbuf: Vec<u8>,
width: usize,
height: usize,
}
impl MidividDecoder {
fn new() -> Self {
Self::default()
}
}
fn lz_decompress(src: &[u8], dst: &mut [u8]) -> DecoderResult<()> {
let mut spos = 0;
let mut dpos = 0;
let end = src.len();
while spos < end {
let oplo = u16::from(src[spos]);
spos += 1;
if spos >= end { return Err(DecoderError::ShortData); }
let ophi = u16::from(src[spos]);
spos += 1;
let mut op = (ophi << 8) | oplo;
for _ in 0..16 {
if spos >= end { return Ok(()); }
let b = src[spos];
spos += 1;
if (op & 1) == 0 {
validate!(dpos < dst.len());
dst[dpos] = b;
dpos += 1;
} else {
validate!(spos < end);
let bb = src[spos];
spos += 1;
let offset = (((b as usize) & 0xF0) << 4) | (bb as usize);
let copy_len = ((b & 0xF) as usize) + 3;
validate!(offset <= dpos);
validate!(offset > 0);
validate!(dpos + copy_len <= dst.len());
for _ in 0..copy_len {
dst[dpos] = dst[dpos - offset];
dpos += 1;
}
}
op >>= 1;
}
}
Ok(())
}
#[allow(clippy::identity_op)]
fn decode_frame(frm: &mut NASimpleVideoFrame<u8>, src: &[u8], width: usize, height: usize) -> DecoderResult<bool> {
validate!(src.len() > 8);
let num_vec = read_u16le(&src[0..])? as usize;
validate!(num_vec <= 512);
let is_intra = read_u16le(&src[2..])? == 1;
let (vecs, nblocks, idx_start) = if is_intra {
(&src[4..], width / 2 * height / 2, num_vec * 12 + 4)
} else {
let num_blocks = read_u32le(&src[4..])? as usize;
let changeset_size = (width >> 5) * (height >> 2);
(&src[8+changeset_size..], num_blocks, num_vec * 12 + 8 + changeset_size)
};
validate!(src.len() > idx_start);
let src1 = if num_vec > 256 { &src[idx_start + (nblocks + 7)/8..] } else { &src[idx_start..] };
let mut mr = MemoryReader::new_read(src1);
let mut idx_br = ByteReader::new(&mut mr);
let mut mr = MemoryReader::new_read(&src[idx_start..]);
let mut idx9_br = ByteReader::new(&mut mr);
let mut hi9 = 0u8;
let mut bits = 0u8;
for y in (0..height).step_by(2) {
for x in (0..width).step_by(2) {
if !is_intra {
let x4 = x >> 2;
let flag_b = src[8 + x4/8 + (y/4) * ((width + 31) >> 5)];
if ((flag_b >> (x4 & 7)) & 1) == 0 {
continue;
}
}
let idx = if num_vec <= 256 {
idx_br.read_byte()? as usize
} else {
if bits == 0 {
hi9 = idx9_br.read_byte()?;
bits = 8;
}
bits -= 1;
let lo = idx_br.read_byte()? as usize;
((((hi9 >> (7 - bits)) & 1) as usize) << 8) | lo
};
validate!(idx < num_vec);
let vec = &vecs[idx * 12..];
for comp in 0..3 {
let dst = &mut frm.data[frm.offset[comp] + x + y * frm.stride[comp]..];
dst[0] = vec[0 + comp];
dst[1] = vec[3 + comp];
dst[frm.stride[comp] + 0] = vec[6 + comp];
dst[frm.stride[comp] + 1] = vec[9 + comp];
}
}
}
Ok(is_intra)
}
impl NADecoder for MidividDecoder {
fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
let fmt = NAPixelFormaton::new(ColorModel::YUV(YUVSubmodel::YCbCr),
Some(NAPixelChromaton::new(0, 0, false, 8, 0, 0, 1)),
Some(NAPixelChromaton::new(0, 0, false, 8, 0, 1, 1)),
Some(NAPixelChromaton::new(0, 0, false, 8, 0, 2, 1)),
None, None, 0, 3);
self.width = vinfo.get_width();
self.height = vinfo.get_height();
let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(self.width, self.height, true, fmt));
self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();
self.lzbuf = vec![0; self.width * self.height * 3];
Ok(())
} else {
Err(DecoderError::InvalidData)
}
}
fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
let src = pkt.get_buffer();
validate!(src.len() > 4);
let size = read_u32le(&src[0..])? as usize;
validate!(size + 8 == src.len());
let data_ptr;
validate!(src.len() > 12);
if read_u32le(&src[8..])? == 0 {
lz_decompress(&src[12..], self.lzbuf.as_mut_slice())?;
data_ptr = self.lzbuf.as_slice();
} else {
data_ptr = &src[12..];
}
let mut buf;
let bufret = self.hams.clone_ref();
if let Some(bbuf) = bufret {
buf = bbuf;
} else {
let bufinfo = alloc_video_buffer(self.info.get_properties().get_video_info().unwrap(), 4)?;
buf = bufinfo.get_vbuf().unwrap();
self.hams.add_frame(buf);
buf = self.hams.get_output_frame().unwrap();
}
let mut frm = NASimpleVideoFrame::from_video_buf(&mut buf).unwrap();
let is_intra = decode_frame(&mut frm, data_ptr, self.width, self.height)?;
let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), NABufferType::Video(buf));
frm.set_keyframe(is_intra);
frm.set_frame_type(if is_intra { FrameType::I } else { FrameType::P });
Ok(frm.into_ref())
}
fn flush(&mut self) {
self.hams.clear();
}
}
impl NAOptionHandler for MidividDecoder {
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_video() -> Box<dyn NADecoder + Send> {
Box::new(MidividDecoder::new())
}
#[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_midivid_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);
// sample: https://samples.mplayerhq.hu/V-codecs/MVDV.avi
test_decoding("avi", "midivid", "assets/Game/MVDV.avi", Some(16), &dmx_reg, &dec_reg,
ExpectedTestResult::MD5Frames(vec![
[0x383e1995, 0x32bf000d, 0x2067aa2e, 0x54425bd4],
[0x91d0bff6, 0x5106cb75, 0x463ba358, 0xdc17d126],
[0x4ce54833, 0xb4fd3e35, 0x639d3830, 0xb47f871b],
[0x7c0c5604, 0x3c89e3ff, 0x05ae09f5, 0x7b725143],
[0xc561ddd9, 0xa3515c8e, 0x6119b31a, 0xb1608e77],
[0xa49bb9aa, 0xaf57e55b, 0xf351d4b0, 0x6289cd91],
[0xc7add756, 0x45574231, 0x5f1d651b, 0x2ae29e0d],
[0x7dd57d54, 0x4ec83f80, 0xef2e870b, 0x6cc310fe],
[0xe9c5fed6, 0xa4a4bab2, 0x70f84ed6, 0xc9d8a010],
[0x586ba118, 0x623fd7b9, 0x480fe7ab, 0xa1a5ad6f]]));
}
}
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