[nihav.git] / nihav-game / src / codecs / gremlinvideo.rs

use nihav_core::frame::*;
use nihav_core::formats;
use nihav_core::formats::{NAChannelType, NAChannelMap};
use nihav_core::codecs::*;
use nihav_core::io::byteio::*;

struct GremlinVideoDecoder {
    info:       NACodecInfoRef,
    pal:        [u8; 768],
    frame:      Vec<u8>,
    scale_v:    bool,
    scale_h:    bool,
}

struct Bits8 {
    queue: u8,
    fill:  u8,
}

struct Bits32 {
    queue: u32,
    fill:  u8,
}

const PREAMBLE_SIZE: usize = 4096;

impl Bits8 {
    fn new() -> Self { Bits8 { queue: 0, fill: 0 } }
    fn read_2bits(&mut self, br: &mut ByteReader) -> ByteIOResult<u8> {
        if self.fill == 0 {
            self.queue  = br.read_byte()?;
            self.fill  += 8;
        }
        let res = self.queue >> 6;
        self.queue <<= 2;
        self.fill   -= 2;
        Ok(res)
    }
}

impl Bits32 {
    fn new() -> Self { Bits32 { queue: 0, fill: 0 } }
    fn fill(&mut self, br: &mut ByteReader) -> ByteIOResult<()> {
        self.queue = br.read_u32le()?;
        self.fill  = 32;
        Ok(())
    }
    fn read_bits(&mut self, br: &mut ByteReader, nbits: u8) -> ByteIOResult<u32> {
        let res = self.queue & ((1 << nbits) - 1);
        self.queue >>= nbits;
        self.fill   -= nbits;
        if self.fill <= 16 {
            self.queue |= u32::from(br.read_u16le()?) << self.fill;
            self.fill  += 16;
        }
        Ok(res)
    }
}

impl GremlinVideoDecoder {
    fn new() -> Self {
        GremlinVideoDecoder {
            info: NACodecInfoRef::default(), pal: [0; 768], frame: Vec::new(),
            scale_v: false, scale_h: false
        }
    }

    fn lz_copy(&mut self, idx: usize, offset: isize, len: usize) -> DecoderResult<()> {
        if idx + len > self.frame.len() { return Err(DecoderError::InvalidData); }
        if offset == -1 {
            let c = self.frame[idx - 1];
            for i in 0..len { self.frame[idx + i] = c; }
        } else if offset < 0 {
            let start = idx - (-offset as usize);
            for i in 0..len { self.frame[idx + i] = self.frame[start + i]; }
        } else {
            if idx + (offset as usize) + len > self.frame.len() { return Err(DecoderError::InvalidData); }
            let start = idx + (offset as usize);
            for i in 0..len { self.frame[idx + i] = self.frame[start + i]; }
        }
        Ok(())
    }

    fn rescale(&mut self, w: usize, h: usize, scale_v: bool, scale_h: bool) {
        if (self.scale_v == scale_v) && (self.scale_h == scale_h) { return; }

        if self.scale_h && self.scale_v {
            for j in 0..h {
                let y = h - j - 1;
                for i in 0..w {
                    let x = w - i - 1;
                    self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x/2 + (y/2) * (w/2)];
                }
            }
        } else if self.scale_h {
            for j in 0..h {
                let y = h - j - 1;
                for x in 0..w {
                    self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x + (y/2) * w];
                }
            }
        } else if self.scale_v {
            for j in 0..h {
                let y = h - j - 1;
                for i in 0..w {
                    let x = w - i - 1;
                    self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x/2 + y * (w/2)];
                }
            }
        }

        if scale_h && scale_v {
            for y in 0..h/2 {
                for x in 0..w/2 {
                    self.frame[PREAMBLE_SIZE + x + y * (w/2)] = self.frame[PREAMBLE_SIZE + x*2 + y*2 * w];
                }
            }
        } else if scale_h {
            for y in 0..h/2 {
                for x in 0..w {
                    self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x + y*2 * w];
                }
            }
        } else if scale_v {
            for y in 0..h {
                for x in 0..w/2 {
                    self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x*2 + y * w];
                }
            }
        }

        self.scale_v = scale_v;
        self.scale_h = scale_h;
    }

    fn output_frame(&mut self, bufinfo: &mut NABufferType, w: usize, h: usize) {
        let bufo = bufinfo.get_vbuf();
        let mut buf = bufo.unwrap();
        let paloff = buf.get_offset(1);
        let stride = buf.get_stride(0);
        let data = buf.get_data_mut().unwrap();
        let dst = data.as_mut_slice();
        let mut sidx = PREAMBLE_SIZE;
        let mut didx = 0;

        for i in 0..768 { dst[paloff + i] = self.pal[i]; }
        if !self.scale_v && !self.scale_h {
            for _ in 0..h {
                for x in 0..w { dst[didx + x] = self.frame[sidx + x]; }
                sidx += w;
                didx += stride;
            }
        } else {
            for y in 0..h {
                if !self.scale_v {
                    for x in 0..w { dst[didx + x] = self.frame[sidx + x]; }
                } else {
                    for x in 0..w { dst[didx + x] = self.frame[sidx + x/2]; }
                }
                if !self.scale_h || ((y & 1) == 1) {
                    sidx += if !self.scale_v { w } else { w/2 };
                }
                didx += stride;
            }
        }
    }

    fn decode_method2(&mut self, br: &mut ByteReader) -> DecoderResult<()> {
        let mut bits = Bits8::new();

        let mut size = self.info.get_properties().get_video_info().unwrap().get_width() *
                        self.info.get_properties().get_video_info().unwrap().get_height();
        let mut idx = PREAMBLE_SIZE;
        if self.frame[8] != 0 {
            for c in 0..256 {
                for i in 0..16 { self.frame[c * 16 + i] = c as u8; }
            }
        }
        while size > 0 {
            let tag = bits.read_2bits(br)?;
            if tag == 0 {
                self.frame[idx] = br.read_byte()?;
                size -= 1;
                idx  += 1;
            } else if tag == 1 {
                let b = br.read_byte()?;
                let len = ((b & 0xF) as usize) + 3;
                let bot = (b >> 4) as isize;
                let off = ((br.read_byte()? as isize) << 4) + bot - 4096;
                validate!(len <= size);
                size -= len;
                self.lz_copy(idx, off, len)?;
                idx += len;
            } else if tag == 2 {
                let len = (br.read_byte()? as usize) + 2;
                validate!(len <= size);
                size -= len;
                idx += len;
            } else {
                break;
            }
        }
        Ok(())
    }

    fn decode_method5(&mut self, br: &mut ByteReader, skip: usize) -> DecoderResult<()> {
        let mut bits = Bits8::new();

        let mut size = self.info.get_properties().get_video_info().unwrap().get_width() *
                        self.info.get_properties().get_video_info().unwrap().get_height();
        let mut idx = PREAMBLE_SIZE;
        validate!(size >= skip);
        size -= skip;
        idx  += skip;
        while size > 0 {
            let tag = bits.read_2bits(br)?;
            if tag == 0 {
                self.frame[idx] = br.read_byte()?;
                size -= 1;
                idx  += 1;
            } else if tag == 1 {
                let b = br.read_byte()?;
                let len = ((b & 0xF) as usize) + 3;
                let bot = (b >> 4) as isize;
                let off = ((br.read_byte()? as isize) << 4) + bot - 4096;
                validate!(len <= size);
                size -= len;
                self.lz_copy(idx, off, len)?;
                idx += len;
            } else if tag == 2 {
                let b = br.read_byte()?;
                if b == 0 { break; }
                let len: usize = (if b != 0xFF { b as usize } else { br.read_u16le()? as usize }) + 1;
                validate!(len <= size);
                size -= len;
                idx += len;
            } else {
                let b = br.read_byte()?;
                let len = ((b & 0x3) as usize) + 2;
                let off = -((b >> 2) as isize) - 1;
                validate!(len <= size);
                size -= len;
                self.lz_copy(idx, off, len)?;
                idx += len;
            }
        }
        Ok(())
    }

    fn decode_method68(&mut self, br: &mut ByteReader,
                       skip: usize, use8: bool) -> DecoderResult<()> {
        let mut bits = Bits32::new();

        let mut size = self.info.get_properties().get_video_info().unwrap().get_width() *
                        self.info.get_properties().get_video_info().unwrap().get_height();
        let mut idx = PREAMBLE_SIZE;
        validate!(size >= skip);
        size -= skip;
        idx  += skip;
        bits.fill(br)?;
        while size > 0 {
            let tag = bits.read_bits(br, 2)?;
            if tag == 0 { //draw
                let b = bits.read_bits(br, 1)?;
                if b == 0 {
                    self.frame[idx] = br.read_byte()?;
                    size -= 1;
                    idx  += 1;
                } else {
                    let mut len: usize = 2;
                    let mut lbits = 0;
                    loop {
                        lbits += 1;
                        let val = bits.read_bits(br, lbits)?;
                        len += val as usize;
                        if val != ((1 << lbits) - 1) { break; }
                        validate!(lbits < 16);
                    }
                    validate!(len <= size);
                    for i in 0..len { self.frame[idx + i] = br.read_byte()?; }
                    size -= len;
                    idx  += len;
                }
            } else if tag == 1 { //skip
                let b = bits.read_bits(br, 1)?;
                let len: usize;
                if b == 0 {
                    len = (bits.read_bits(br, 4)? as usize) + 2;
                } else {
                    let bb = br.read_byte()?;
                    if (bb & 0x80) == 0 {
                        len = (bb as usize) + 18;
                    } else {
                        let top = ((bb & 0x7F) as usize) << 8;
                        len = top + (br.read_byte()? as usize) + 146;
                    }
                }
                validate!(len <= size);
                size -= len;
                idx  += len;
            } else if tag == 2 {
                let subtag = bits.read_bits(br, 2)? as usize;
                if subtag != 3 {
                    let top = (bits.read_bits(br, 4)? as usize) << 8;
                    let offs = top + (br.read_byte()? as usize);
                    if (subtag != 0) || (offs <= 0xF80) {
                        let len = (subtag as usize) + 3;
                        self.lz_copy(idx, (offs as isize) - 4096, len)?;
                        idx += len;
                    } else {
                        if offs == 0xFFF { return Ok(()); }
                        let real_off = ((offs >> 4) & 0x7) + 1;
                        let len = ((offs & 0xF) + 2) * 2;
                        validate!(len <= size);
                        size -= len;
                        let c1 = self.frame[idx - real_off];
                        let c2 = self.frame[idx - real_off + 1];
                        for i in 0..len/2 {
                            self.frame[idx + i*2 + 0] = c1;
                            self.frame[idx + i*2 + 1] = c2;
                        }
                        idx += len;
                    }
                } else {
                    let b = br.read_byte()?;
                    let off = ((b & 0x7F) as usize) + 1;
                    let len = if (b & 0x80) == 0 { 2 } else { 3 };
                    validate!(len <= size);
                    size -= len;
                    self.lz_copy(idx, -(off as isize), len)?;
                    idx += len;
                }
            } else {
                let len: usize;
                let off: isize;
                if use8 {
                    let b = br.read_byte()?;
                    if (b & 0xC0) == 0xC0 {
                        len = ((b & 0x3F) as usize) + 8;
                        let q = bits.read_bits(br, 4)? as isize;
                        off = (q << 8) + (br.read_byte()? as isize) + 1;
                    } else {
                        let ofs1: isize;
                        if (b & 0x80) == 0 {
                            len = ((b >> 4) as usize) + 6;
                            ofs1 = (b & 0xF) as isize;
                        } else {
                            len = ((b & 0x3F) as usize) + 14;
                            ofs1 = bits.read_bits(br, 4)? as isize;
                        }
                        off = (ofs1 << 8) + (br.read_byte()? as isize) - 4096;
                    }
                } else {
                    let b = br.read_byte()?;
                    if (b >> 4) == 0xF {
                        len = (br.read_byte()? as usize) + 21;
                    } else {
                        len = ((b >> 4) as usize) + 6;
                    }
                    let ofs1 = (b & 0xF) as isize;
                    off = (ofs1 << 8) + (br.read_byte()? as isize) - 4096;
                }
                validate!(len <= size);
                size -= len;
                self.lz_copy(idx, off, len)?;
                idx += len;
            }
        }
        Ok(())
    }
}

impl NADecoder for GremlinVideoDecoder {
    fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
        if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
            let w = vinfo.get_width();
            let h = vinfo.get_height();
            if !vinfo.get_format().is_paletted() { return Err(DecoderError::NotImplemented); }
            let fmt = PAL8_FORMAT;
            let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(w, h, false, fmt));
            self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();

            self.frame.resize(PREAMBLE_SIZE + w * h, 0);
            for i in 0..2 {
                for j in 0..256 {
                    for k in 0..8 {
                        self.frame[i * 2048 + j * 8 + k] = j as u8;
                    }
                }
            }
            let edata = info.get_extradata().unwrap();
            validate!(edata.len() == 768);
            for c in 0..256 {
                for i in 0..3 {
                    let cc = edata[c * 3 + i];
                    self.pal[c * 3 + i] = (cc << 2) | (cc >> 4);
                }
            }
            Ok(())
        } else {
            Err(DecoderError::InvalidData)
        }
    }
    fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
        let src = pkt.get_buffer();
        let mut mr = MemoryReader::new_read(&src);
        let mut br = ByteReader::new(&mut mr);
        let flags = br.read_u32le()?;
        let w = self.info.get_properties().get_video_info().unwrap().get_width();
        let h = self.info.get_properties().get_video_info().unwrap().get_height();

        let cmethod = flags & 0xF;
        let is_intra = (flags & 0x40) != 0;
        let scale_v = (flags & 0x10) != 0;
        let scale_h = (flags & 0x20) != 0;

        self.rescale(w, h, scale_v, scale_h);

        if (cmethod == 0) || (cmethod == 1) {
            for c in 0..256 {
                for i in 0..3 {
                    let b = br.read_byte()?;
                    self.pal[c * 3 + i] = (b << 2) | (b >> 4);
                }
            }
            if cmethod == 1 {
                for i in PREAMBLE_SIZE..self.frame.len() { self.frame[i] = 0x00; }
            }
            let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), NABufferType::None);
            frm.set_keyframe(false);
            frm.set_frame_type(FrameType::Skip);
            return Ok(frm.into_ref())
        } else if cmethod == 3 {
            let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), NABufferType::None);
            frm.set_keyframe(false);
            frm.set_frame_type(FrameType::Skip);
            return Ok(frm.into_ref())
        } else if cmethod == 2 {
            self.decode_method2(&mut br)?;
        } else if cmethod == 5 {
            self.decode_method5(&mut br, (flags >> 8) as usize)?;
        } else if cmethod == 6 {
            self.decode_method68(&mut br, (flags >> 8) as usize, false)?;
        } else if cmethod == 8 {
            self.decode_method68(&mut br, (flags >> 8) as usize, true)?;
        } else {
            return Err(DecoderError::NotImplemented);
        }

        let mut bufinfo = alloc_video_buffer(self.info.get_properties().get_video_info().unwrap(), 0)?;

        self.output_frame(&mut bufinfo, w, h);

        let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), bufinfo);
        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) {
    }
}

pub fn get_decoder_video() -> Box<dyn NADecoder + Send> {
    Box::new(GremlinVideoDecoder::new())
}

struct GremlinAudioDecoder {
    ainfo:      NAAudioInfo,
    chmap:      NAChannelMap,
    delta_tab: [i16; 256],
    state0:     i16,
    state1:     i16,
}

impl GremlinAudioDecoder {
    fn new() -> Self {
        let mut delta_tab: [i16; 256] = [0; 256];
        let mut delta = 0;
        let mut code = 64;
        let mut step = 45;
        for i in 0..127 {
            delta += code >> 5;
            code  += step;
            step  += 2;
            delta_tab[i * 2 + 1] =  delta;
            delta_tab[i * 2 + 2] = -delta;
        }
        delta_tab[255] = 32767;//delta + (code >> 5);
        GremlinAudioDecoder {
            ainfo:  NAAudioInfo::new(0, 1, formats::SND_S16_FORMAT, 0),
            chmap:  NAChannelMap::new(),
            delta_tab,
            state0: 0,
            state1: 0,
        }
    }
}

const CHMAP_MONO: [NAChannelType; 1] = [NAChannelType::C];
const CHMAP_STEREO: [NAChannelType; 2] = [NAChannelType::L, NAChannelType::R];

fn get_default_chmap(nch: u8) -> NAChannelMap {
    let mut chmap = NAChannelMap::new();
    match nch {
        1 => chmap.add_channels(&CHMAP_MONO),
        2 => chmap.add_channels(&CHMAP_STEREO),
        _ => (),
    }
    chmap
}

impl NADecoder for GremlinAudioDecoder {
    fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
        if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
            self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), ainfo.get_channels(), formats::SND_S16P_FORMAT, ainfo.get_block_len());
            self.chmap = get_default_chmap(ainfo.get_channels());
            if self.chmap.num_channels() == 0 { return Err(DecoderError::InvalidData); }
            Ok(())
        } else {
            Err(DecoderError::InvalidData)
        }
    }
    fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
        let info = pkt.get_stream().get_info();
        if let NACodecTypeInfo::Audio(_) = info.get_properties() {
            let pktbuf = pkt.get_buffer();
            let samples = pktbuf.len() / self.chmap.num_channels();
            let abuf = alloc_audio_buffer(self.ainfo, samples, self.chmap.clone())?;
            let mut adata = abuf.get_abuf_i16().unwrap();
            let off1 = adata.get_offset(1);
            let buf = adata.get_data_mut().unwrap();
            if self.chmap.num_channels() == 2 {
                for (i, e) in pktbuf.chunks(2).enumerate() {
                    self.state0 = self.state0.wrapping_add(self.delta_tab[e[0] as usize]);
                    buf[i] = self.state0;
                    self.state1 = self.state1.wrapping_add(self.delta_tab[e[1] as usize]);
                    buf[off1 + i] = self.state1;
                }
            } else {
                for (i, e) in pktbuf.iter().enumerate() {
                    self.state0 += self.delta_tab[*e as usize];
                    buf[i] = self.state0;
                }
            }
            let mut frm = NAFrame::new_from_pkt(pkt, info, abuf);
            frm.set_duration(Some(samples as u64));
            frm.set_keyframe(false);
            Ok(frm.into_ref())
        } else {
            Err(DecoderError::InvalidData)
        }
    }
    fn flush(&mut self) {
    }
}

pub fn get_decoder_audio() -> Box<dyn NADecoder + Send> {
    Box::new(GremlinAudioDecoder::new())
}

#[cfg(test)]
mod test {
    use nihav_core::codecs::RegisteredDecoders;
    use nihav_core::demuxers::RegisteredDemuxers;
    use nihav_core::test::dec_video::test_file_decoding;
    use crate::game_register_all_codecs;
    use crate::game_register_all_demuxers;
    #[test]
    fn test_gdv() {
        let mut dmx_reg = RegisteredDemuxers::new();
        game_register_all_demuxers(&mut dmx_reg);
        let mut dec_reg = RegisteredDecoders::new();
        game_register_all_codecs(&mut dec_reg);

        test_file_decoding("gdv", "assets/Game/intro1.gdv", Some(10), true, false, None, &dmx_reg, &dec_reg);
    }
}
Commit	Line	Data
5641dccf KS	1	use nihav_core::frame::*;
	2	use nihav_core::formats;
	3	use nihav_core::formats::{NAChannelType, NAChannelMap};
	4	use nihav_core::codecs::*;
	5	use nihav_core::io::byteio::*;
e120f8fd KS	6
e120f8fd KS	7	struct GremlinVideoDecoder {
2422d969	8	info: NACodecInfoRef,
e120f8fd KS	9	pal: [u8; 768],
	10	frame: Vec<u8>,
	11	scale_v: bool,
	12	scale_h: bool,
	13	}
	14
8e652498 KS	15	struct Bits8 {
8e652498 KS	16	queue: u8,
e120f8fd KS	17	fill: u8,
	18	}
	19
	20	struct Bits32 {
	21	queue: u32,
	22	fill: u8,
	23	}
	24
	25	const PREAMBLE_SIZE: usize = 4096;
	26
8e652498 KS	27	impl Bits8 {
	28	fn new() -> Self { Bits8 { queue: 0, fill: 0 } }
	29	fn read_2bits(&mut self, br: &mut ByteReader) -> ByteIOResult<u8> {
e120f8fd	30	if self.fill == 0 {
8e652498	31	self.queue = br.read_byte()?;
e120f8fd KS	32	self.fill += 8;
e120f8fd KS	33	}
8e652498 KS	34	let res = self.queue >> 6;
8e652498 KS	35	self.queue <<= 2;
e120f8fd KS	36	self.fill -= 2;
	37	Ok(res)
	38	}
	39	}
	40
	41	impl Bits32 {
	42	fn new() -> Self { Bits32 { queue: 0, fill: 0 } }
	43	fn fill(&mut self, br: &mut ByteReader) -> ByteIOResult<()> {
	44	self.queue = br.read_u32le()?;
	45	self.fill = 32;
	46	Ok(())
	47	}
	48	fn read_bits(&mut self, br: &mut ByteReader, nbits: u8) -> ByteIOResult<u32> {
	49	let res = self.queue & ((1 << nbits) - 1);
	50	self.queue >>= nbits;
	51	self.fill -= nbits;
	52	if self.fill <= 16 {
e69b1148	53	self.queue \|= u32::from(br.read_u16le()?) << self.fill;
e120f8fd KS	54	self.fill += 16;
	55	}
	56	Ok(res)
	57	}
	58	}
	59
	60	impl GremlinVideoDecoder {
	61	fn new() -> Self {
e120f8fd	62	GremlinVideoDecoder {
2422d969	63	info: NACodecInfoRef::default(), pal: [0; 768], frame: Vec::new(),
e120f8fd KS	64	scale_v: false, scale_h: false
	65	}
	66	}
	67
	68	fn lz_copy(&mut self, idx: usize, offset: isize, len: usize) -> DecoderResult<()> {
	69	if idx + len > self.frame.len() { return Err(DecoderError::InvalidData); }
	70	if offset == -1 {
	71	let c = self.frame[idx - 1];
	72	for i in 0..len { self.frame[idx + i] = c; }
	73	} else if offset < 0 {
	74	let start = idx - (-offset as usize);
	75	for i in 0..len { self.frame[idx + i] = self.frame[start + i]; }
	76	} else {
	77	if idx + (offset as usize) + len > self.frame.len() { return Err(DecoderError::InvalidData); }
	78	let start = idx + (offset as usize);
	79	for i in 0..len { self.frame[idx + i] = self.frame[start + i]; }
	80	}
	81	Ok(())
	82	}
	83
	84	fn rescale(&mut self, w: usize, h: usize, scale_v: bool, scale_h: bool) {
	85	if (self.scale_v == scale_v) && (self.scale_h == scale_h) { return; }
	86
	87	if self.scale_h && self.scale_v {
	88	for j in 0..h {
	89	let y = h - j - 1;
	90	for i in 0..w {
	91	let x = w - i - 1;
	92	self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x/2 + (y/2) * (w/2)];
	93	}
	94	}
	95	} else if self.scale_h {
	96	for j in 0..h {
	97	let y = h - j - 1;
	98	for x in 0..w {
	99	self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x + (y/2) * w];
	100	}
	101	}
	102	} else if self.scale_v {
	103	for j in 0..h {
	104	let y = h - j - 1;
	105	for i in 0..w {
	106	let x = w - i - 1;
	107	self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x/2 + y * (w/2)];
	108	}
	109	}
	110	}
	111
	112	if scale_h && scale_v {
	113	for y in 0..h/2 {
	114	for x in 0..w/2 {
	115	self.frame[PREAMBLE_SIZE + x + y * (w/2)] = self.frame[PREAMBLE_SIZE + x2 + y2 * w];
	116	}
	117	}
	118	} else if scale_h {
	119	for y in 0..h/2 {
	120	for x in 0..w {
	121	self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x + y2 w];
	122	}
	123	}
	124	} else if scale_v {
	125	for y in 0..h {
	126	for x in 0..w/2 {
	127	self.frame[PREAMBLE_SIZE + x + y * w] = self.frame[PREAMBLE_SIZE + x2 + y w];
128	}
129	}
130	}
131
132	self.scale_v = scale_v;
133	self.scale_h = scale_h;
134	}
135
136	fn output_frame(&mut self, bufinfo: &mut NABufferType, w: usize, h: usize) {
137	let bufo = bufinfo.get_vbuf();
138	let mut buf = bufo.unwrap();
139	let paloff = buf.get_offset(1);
140	let stride = buf.get_stride(0);
1a967e6b	141	let data = buf.get_data_mut().unwrap();
9037cf6b	142	let dst = data.as_mut_slice();
e120f8fd KS	143	let mut sidx = PREAMBLE_SIZE;
	144	let mut didx = 0;
	145
	146	for i in 0..768 { dst[paloff + i] = self.pal[i]; }
	147	if !self.scale_v && !self.scale_h {
	148	for _ in 0..h {
	149	for x in 0..w { dst[didx + x] = self.frame[sidx + x]; }
	150	sidx += w;
	151	didx += stride;
	152	}
	153	} else {
	154	for y in 0..h {
	155	if !self.scale_v {
	156	for x in 0..w { dst[didx + x] = self.frame[sidx + x]; }
	157	} else {
	158	for x in 0..w { dst[didx + x] = self.frame[sidx + x/2]; }
	159	}
	160	if !self.scale_h \|\| ((y & 1) == 1) {
	161	sidx += if !self.scale_v { w } else { w/2 };
	162	}
	163	didx += stride;
	164	}
	165	}
	166	}
	167
	168	fn decode_method2(&mut self, br: &mut ByteReader) -> DecoderResult<()> {
8e652498	169	let mut bits = Bits8::new();
e120f8fd KS	170
	171	let mut size = self.info.get_properties().get_video_info().unwrap().get_width() *
	172	self.info.get_properties().get_video_info().unwrap().get_height();
	173	let mut idx = PREAMBLE_SIZE;
8e652498 KS	174	if self.frame[8] != 0 {
	175	for c in 0..256 {
	176	for i in 0..16 { self.frame[c * 16 + i] = c as u8; }
	177	}
e120f8fd KS	178	}
	179	while size > 0 {
	180	let tag = bits.read_2bits(br)?;
	181	if tag == 0 {
	182	self.frame[idx] = br.read_byte()?;
	183	size -= 1;
	184	idx += 1;
	185	} else if tag == 1 {
	186	let b = br.read_byte()?;
	187	let len = ((b & 0xF) as usize) + 3;
8e652498 KS	188	let bot = (b >> 4) as isize;
8e652498 KS	189	let off = ((br.read_byte()? as isize) << 4) + bot - 4096;
e120f8fd KS	190	validate!(len <= size);
e120f8fd KS	191	size -= len;
8e652498	192	self.lz_copy(idx, off, len)?;
e120f8fd KS	193	idx += len;
	194	} else if tag == 2 {
	195	let len = (br.read_byte()? as usize) + 2;
	196	validate!(len <= size);
	197	size -= len;
	198	idx += len;
	199	} else {
	200	break;
	201	}
	202	}
	203	Ok(())
	204	}
	205
	206	fn decode_method5(&mut self, br: &mut ByteReader, skip: usize) -> DecoderResult<()> {
8e652498	207	let mut bits = Bits8::new();
e120f8fd KS	208
	209	let mut size = self.info.get_properties().get_video_info().unwrap().get_width() *
	210	self.info.get_properties().get_video_info().unwrap().get_height();
	211	let mut idx = PREAMBLE_SIZE;
	212	validate!(size >= skip);
	213	size -= skip;
	214	idx += skip;
	215	while size > 0 {
	216	let tag = bits.read_2bits(br)?;
	217	if tag == 0 {
	218	self.frame[idx] = br.read_byte()?;
	219	size -= 1;
	220	idx += 1;
	221	} else if tag == 1 {
	222	let b = br.read_byte()?;
	223	let len = ((b & 0xF) as usize) + 3;
8e652498 KS	224	let bot = (b >> 4) as isize;
8e652498 KS	225	let off = ((br.read_byte()? as isize) << 4) + bot - 4096;
e120f8fd KS	226	validate!(len <= size);
e120f8fd KS	227	size -= len;
8e652498	228	self.lz_copy(idx, off, len)?;
e120f8fd KS	229	idx += len;
	230	} else if tag == 2 {
	231	let b = br.read_byte()?;
	232	if b == 0 { break; }
8e652498	233	let len: usize = (if b != 0xFF { b as usize } else { br.read_u16le()? as usize }) + 1;
e120f8fd KS	234	validate!(len <= size);
	235	size -= len;
	236	idx += len;
	237	} else {
	238	let b = br.read_byte()?;
	239	let len = ((b & 0x3) as usize) + 2;
	240	let off = -((b >> 2) as isize) - 1;
	241	validate!(len <= size);
	242	size -= len;
1a151e53	243	self.lz_copy(idx, off, len)?;
e120f8fd KS	244	idx += len;
	245	}
	246	}
	247	Ok(())
	248	}
	249
	250	fn decode_method68(&mut self, br: &mut ByteReader,
	251	skip: usize, use8: bool) -> DecoderResult<()> {
	252	let mut bits = Bits32::new();
	253
	254	let mut size = self.info.get_properties().get_video_info().unwrap().get_width() *
	255	self.info.get_properties().get_video_info().unwrap().get_height();
	256	let mut idx = PREAMBLE_SIZE;
	257	validate!(size >= skip);
	258	size -= skip;
	259	idx += skip;
	260	bits.fill(br)?;
	261	while size > 0 {
	262	let tag = bits.read_bits(br, 2)?;
	263	if tag == 0 { //draw
	264	let b = bits.read_bits(br, 1)?;
	265	if b == 0 {
	266	self.frame[idx] = br.read_byte()?;
	267	size -= 1;
	268	idx += 1;
	269	} else {
	270	let mut len: usize = 2;
	271	let mut lbits = 0;
	272	loop {
	273	lbits += 1;
	274	let val = bits.read_bits(br, lbits)?;
	275	len += val as usize;
	276	if val != ((1 << lbits) - 1) { break; }
	277	validate!(lbits < 16);
	278	}
	279	validate!(len <= size);
	280	for i in 0..len { self.frame[idx + i] = br.read_byte()?; }
	281	size -= len;
	282	idx += len;
	283	}
	284	} else if tag == 1 { //skip
	285	let b = bits.read_bits(br, 1)?;
	286	let len: usize;
	287	if b == 0 {
	288	len = (bits.read_bits(br, 4)? as usize) + 2;
	289	} else {
	290	let bb = br.read_byte()?;
	291	if (bb & 0x80) == 0 {
	292	len = (bb as usize) + 18;
	293	} else {
	294	let top = ((bb & 0x7F) as usize) << 8;
	295	len = top + (br.read_byte()? as usize) + 146;
	296	}
	297	}
	298	validate!(len <= size);
	299	size -= len;
	300	idx += len;
	301	} else if tag == 2 {
	302	let subtag = bits.read_bits(br, 2)? as usize;
	303	if subtag != 3 {
	304	let top = (bits.read_bits(br, 4)? as usize) << 8;
	305	let offs = top + (br.read_byte()? as usize);
	306	if (subtag != 0) \|\| (offs <= 0xF80) {
	307	let len = (subtag as usize) + 3;
308	self.lz_copy(idx, (offs as isize) - 4096, len)?;
309	idx += len;
310	} else {
311	if offs == 0xFFF { return Ok(()); }
312	let real_off = ((offs >> 4) & 0x7) + 1;
313	let len = ((offs & 0xF) + 2) * 2;
314	validate!(len <= size);
315	size -= len;
316	let c1 = self.frame[idx - real_off];
317	let c2 = self.frame[idx - real_off + 1];
318	for i in 0..len/2 {
319	self.frame[idx + i*2 + 0] = c1;
320	self.frame[idx + i*2 + 1] = c2;
321	}
322	idx += len;
323	}
324	} else {
325	let b = br.read_byte()?;
326	let off = ((b & 0x7F) as usize) + 1;
327	let len = if (b & 0x80) == 0 { 2 } else { 3 };
328	validate!(len <= size);
329	size -= len;
1a151e53	330	self.lz_copy(idx, -(off as isize), len)?;
e120f8fd KS	331	idx += len;
	332	}
	333	} else {
	334	let len: usize;
	335	let off: isize;
	336	if use8 {
	337	let b = br.read_byte()?;
	338	if (b & 0xC0) == 0xC0 {
	339	len = ((b & 0x3F) as usize) + 8;
	340	let q = bits.read_bits(br, 4)? as isize;
	341	off = (q << 8) + (br.read_byte()? as isize) + 1;
	342	} else {
	343	let ofs1: isize;
	344	if (b & 0x80) == 0 {
	345	len = ((b >> 4) as usize) + 6;
	346	ofs1 = (b & 0xF) as isize;
	347	} else {
	348	len = ((b & 0x3F) as usize) + 14;
	349	ofs1 = bits.read_bits(br, 4)? as isize;
	350	}
	351	off = (ofs1 << 8) + (br.read_byte()? as isize) - 4096;
	352	}
	353	} else {
	354	let b = br.read_byte()?;
	355	if (b >> 4) == 0xF {
	356	len = (br.read_byte()? as usize) + 21;
	357	} else {
	358	len = ((b >> 4) as usize) + 6;
	359	}
	360	let ofs1 = (b & 0xF) as isize;
	361	off = (ofs1 << 8) + (br.read_byte()? as isize) - 4096;
	362	}
	363	validate!(len <= size);
	364	size -= len;
1a151e53	365	self.lz_copy(idx, off, len)?;
e120f8fd KS	366	idx += len;
	367	}
	368	}
	369	Ok(())
	370	}
	371	}
	372
	373	impl NADecoder for GremlinVideoDecoder {
01613464	374	fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
e120f8fd KS	375	if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
	376	let w = vinfo.get_width();
	377	let h = vinfo.get_height();
	378	if !vinfo.get_format().is_paletted() { return Err(DecoderError::NotImplemented); }
cbc3c7a2	379	let fmt = PAL8_FORMAT;
e120f8fd	380	let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(w, h, false, fmt));
2422d969	381	self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();
e120f8fd KS	382
	383	self.frame.resize(PREAMBLE_SIZE + w * h, 0);
	384	for i in 0..2 {
	385	for j in 0..256 {
	386	for k in 0..8 {
	387	self.frame[i * 2048 + j * 8 + k] = j as u8;
	388	}
	389	}
	390	}
	391	let edata = info.get_extradata().unwrap();
	392	validate!(edata.len() == 768);
	393	for c in 0..256 {
	394	for i in 0..3 {
	395	let cc = edata[c * 3 + i];
cbc3c7a2	396	self.pal[c * 3 + i] = (cc << 2) \| (cc >> 4);
e120f8fd KS	397	}
	398	}
	399	Ok(())
	400	} else {
	401	Err(DecoderError::InvalidData)
	402	}
	403	}
01613464	404	fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
e120f8fd KS	405	let src = pkt.get_buffer();
	406	let mut mr = MemoryReader::new_read(&src);
	407	let mut br = ByteReader::new(&mut mr);
	408	let flags = br.read_u32le()?;
	409	let w = self.info.get_properties().get_video_info().unwrap().get_width();
	410	let h = self.info.get_properties().get_video_info().unwrap().get_height();
	411
	412	let cmethod = flags & 0xF;
	413	let is_intra = (flags & 0x40) != 0;
	414	let scale_v = (flags & 0x10) != 0;
	415	let scale_h = (flags & 0x20) != 0;
	416
	417	self.rescale(w, h, scale_v, scale_h);
	418
	419	if (cmethod == 0) \|\| (cmethod == 1) {
	420	for c in 0..256 {
	421	for i in 0..3 {
	422	let b = br.read_byte()?;
cbc3c7a2	423	self.pal[c * 3 + i] = (b << 2) \| (b >> 4);
e120f8fd KS	424	}
	425	}
	426	if cmethod == 1 {
	427	for i in PREAMBLE_SIZE..self.frame.len() { self.frame[i] = 0x00; }
	428	}
	429	let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), NABufferType::None);
	430	frm.set_keyframe(false);
	431	frm.set_frame_type(FrameType::Skip);
171860fc	432	return Ok(frm.into_ref())
e120f8fd KS	433	} else if cmethod == 3 {
	434	let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), NABufferType::None);
	435	frm.set_keyframe(false);
	436	frm.set_frame_type(FrameType::Skip);
171860fc	437	return Ok(frm.into_ref())
e120f8fd KS	438	} else if cmethod == 2 {
	439	self.decode_method2(&mut br)?;
	440	} else if cmethod == 5 {
	441	self.decode_method5(&mut br, (flags >> 8) as usize)?;
	442	} else if cmethod == 6 {
	443	self.decode_method68(&mut br, (flags >> 8) as usize, false)?;
	444	} else if cmethod == 8 {
	445	self.decode_method68(&mut br, (flags >> 8) as usize, true)?;
	446	} else {
	447	return Err(DecoderError::NotImplemented);
	448	}
	449
e69b1148	450	let mut bufinfo = alloc_video_buffer(self.info.get_properties().get_video_info().unwrap(), 0)?;
e120f8fd KS	451
	452	self.output_frame(&mut bufinfo, w, h);
	453
	454	let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), bufinfo);
	455	frm.set_keyframe(is_intra);
	456	frm.set_frame_type(if is_intra { FrameType::I } else { FrameType::P });
171860fc	457	Ok(frm.into_ref())
e120f8fd	458	}
f9be4e75 KS	459	fn flush(&mut self) {
f9be4e75 KS	460	}
e120f8fd KS	461	}
e120f8fd KS	462
08a1fab7	463	pub fn get_decoder_video() -> Box<dyn NADecoder + Send> {
e120f8fd KS	464	Box::new(GremlinVideoDecoder::new())
	465	}
	466
b74ff9fa KS	467	struct GremlinAudioDecoder {
	468	ainfo: NAAudioInfo,
	469	chmap: NAChannelMap,
	470	delta_tab: [i16; 256],
	471	state0: i16,
	472	state1: i16,
	473	}
	474
	475	impl GremlinAudioDecoder {
	476	fn new() -> Self {
	477	let mut delta_tab: [i16; 256] = [0; 256];
	478	let mut delta = 0;
	479	let mut code = 64;
	480	let mut step = 45;
	481	for i in 0..127 {
	482	delta += code >> 5;
	483	code += step;
	484	step += 2;
	485	delta_tab[i * 2 + 1] = delta;
	486	delta_tab[i * 2 + 2] = -delta;
	487	}
	488	delta_tab[255] = 32767;//delta + (code >> 5);
	489	GremlinAudioDecoder {
	490	ainfo: NAAudioInfo::new(0, 1, formats::SND_S16_FORMAT, 0),
	491	chmap: NAChannelMap::new(),
	492	delta_tab,
	493	state0: 0,
	494	state1: 0,
	495	}
	496	}
	497	}
	498
	499	const CHMAP_MONO: [NAChannelType; 1] = [NAChannelType::C];
	500	const CHMAP_STEREO: [NAChannelType; 2] = [NAChannelType::L, NAChannelType::R];
	501
	502	fn get_default_chmap(nch: u8) -> NAChannelMap {
	503	let mut chmap = NAChannelMap::new();
	504	match nch {
	505	1 => chmap.add_channels(&CHMAP_MONO),
	506	2 => chmap.add_channels(&CHMAP_STEREO),
	507	_ => (),
	508	}
	509	chmap
	510	}
	511
	512	impl NADecoder for GremlinAudioDecoder {
01613464	513	fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
b74ff9fa KS	514	if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
	515	self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), ainfo.get_channels(), formats::SND_S16P_FORMAT, ainfo.get_block_len());
	516	self.chmap = get_default_chmap(ainfo.get_channels());
	517	if self.chmap.num_channels() == 0 { return Err(DecoderError::InvalidData); }
	518	Ok(())
	519	} else {
	520	Err(DecoderError::InvalidData)
	521	}
	522	}
01613464	523	fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
b74ff9fa KS	524	let info = pkt.get_stream().get_info();
	525	if let NACodecTypeInfo::Audio(_) = info.get_properties() {
	526	let pktbuf = pkt.get_buffer();
	527	let samples = pktbuf.len() / self.chmap.num_channels();
b70cc006	528	let abuf = alloc_audio_buffer(self.ainfo, samples, self.chmap.clone())?;
b74ff9fa KS	529	let mut adata = abuf.get_abuf_i16().unwrap();
b74ff9fa KS	530	let off1 = adata.get_offset(1);
1a967e6b	531	let buf = adata.get_data_mut().unwrap();
b74ff9fa KS	532	if self.chmap.num_channels() == 2 {
	533	for (i, e) in pktbuf.chunks(2).enumerate() {
	534	self.state0 = self.state0.wrapping_add(self.delta_tab[e[0] as usize]);
	535	buf[i] = self.state0;
	536	self.state1 = self.state1.wrapping_add(self.delta_tab[e[1] as usize]);
	537	buf[off1 + i] = self.state1;
	538	}
	539	} else {
	540	for (i, e) in pktbuf.iter().enumerate() {
	541	self.state0 += self.delta_tab[*e as usize];
	542	buf[i] = self.state0;
	543	}
	544	}
	545	let mut frm = NAFrame::new_from_pkt(pkt, info, abuf);
	546	frm.set_duration(Some(samples as u64));
	547	frm.set_keyframe(false);
171860fc	548	Ok(frm.into_ref())
b74ff9fa KS	549	} else {
	550	Err(DecoderError::InvalidData)
	551	}
	552	}
f9be4e75 KS	553	fn flush(&mut self) {
f9be4e75 KS	554	}
b74ff9fa KS	555	}
b74ff9fa KS	556
08a1fab7	557	pub fn get_decoder_audio() -> Box<dyn NADecoder + Send> {
b74ff9fa KS	558	Box::new(GremlinAudioDecoder::new())
	559	}
	560
e120f8fd KS	561	#[cfg(test)]
e120f8fd KS	562	mod test {
3167c45c KS	563	use nihav_core::codecs::RegisteredDecoders;
	564	use nihav_core::demuxers::RegisteredDemuxers;
	565	use nihav_core::test::dec_video::test_file_decoding;
e64739f8 KS	566	use crate::game_register_all_codecs;
e64739f8 KS	567	use crate::game_register_all_demuxers;
e120f8fd KS	568	#[test]
e120f8fd KS	569	fn test_gdv() {
3167c45c KS	570	let mut dmx_reg = RegisteredDemuxers::new();
	571	game_register_all_demuxers(&mut dmx_reg);
	572	let mut dec_reg = RegisteredDecoders::new();
	573	game_register_all_codecs(&mut dec_reg);
	574
1678d59a	575	test_file_decoding("gdv", "assets/Game/intro1.gdv", Some(10), true, false, None, &dmx_reg, &dec_reg);
e120f8fd KS	576	}
e120f8fd KS	577	}