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use nihav_core::codecs::*;
use nihav_core::io::byteio::*;
const FRAME_W: usize = 320;
const FRAME_H: usize = 160;
struct IMAXDecoder {
info: NACodecInfoRef,
pal: [u8; 768],
frame: [u8; FRAME_W * FRAME_H],
hist: [u8; 32768],
hist_pos: usize,
}
impl IMAXDecoder {
fn new() -> Self {
Self {
info: NACodecInfoRef::default(),
pal: [0; 768],
frame: [0; FRAME_W * FRAME_H],
hist: [0; 32768],
hist_pos: 0,
}
}
}
impl NADecoder for IMAXDecoder {
fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
if let NACodecTypeInfo::Video(_vinfo) = info.get_properties() {
/*let fmt = NAPixelFormaton::new(ColorModel::RGB(RGBSubmodel::RGB),
Some(NAPixelChromaton::new(0, 0, true, 8, 0, 0, 3)),
Some(NAPixelChromaton::new(0, 0, true, 8, 0, 1, 3)),
Some(NAPixelChromaton::new(0, 0, true, 8, 0, 2, 3)),
None, None,
FORMATON_FLAG_PALETTE, 3);*/
let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(FRAME_W, FRAME_H, false, PAL8_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() > 0);
for sd in pkt.side_data.iter() {
if let NASideData::Palette(true, ref pal) = sd {
for (dst, src) in self.pal.chunks_mut(3).zip(pal.chunks(4)) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
}
break;
}
}
let mut mr = MemoryReader::new_read(&src);
let mut br = ByteReader::new(&mut mr);
let mut is_intra = true;
let mut is_skip = true;
let mut idx = 0;
while idx < self.frame.len() {
let v = br.read_byte()?;
let op = v >> 6;
let len = (v & 0x3F) as usize;
match op {
0 => {
validate!(idx + len <= self.frame.len());
idx += len;
is_intra = false;
},
1 => {
if len == 0 {
let off = br.read_u16le()? as usize;
let len = br.read_byte()? as usize;
validate!(idx + len <= self.frame.len());
validate!(off + len <= self.hist.len());
self.frame[idx..][..len].copy_from_slice(&self.hist[off..][..len]);
} else {
validate!(idx + len <= self.frame.len());
br.read_buf(&mut self.frame[idx..][..len])?;
if self.hist_pos + len <= self.hist.len() {
self.hist[self.hist_pos..][..len].copy_from_slice(&self.frame[idx..][..len]);
self.hist_pos += len;
}
idx += len;
}
is_skip = false;
},
2 => {
let pix = br.read_byte()?;
validate!(idx + len <= self.frame.len());
for _ in 0..len {
self.frame[idx] = pix;
idx += 1;
}
is_skip = false;
},
_ => {
let len2 = br.read_byte()? as usize;
let skip_len = len * 64 + len2;
validate!(idx + skip_len <= self.frame.len());
idx += skip_len;
is_intra = false;
},
};
}
let bufinfo = if !is_skip {
let binfo = alloc_video_buffer(self.info.get_properties().get_video_info().unwrap(), 0)?;
let mut vbuf = binfo.get_vbuf().unwrap();
let paloff = vbuf.get_offset(1);
let stride = vbuf.get_stride(0);
let data = vbuf.get_data_mut().unwrap();
for (drow, srow) in data.chunks_mut(stride).zip(self.frame.chunks(FRAME_W)) {
drow[..FRAME_W].copy_from_slice(srow);
}
data[paloff..][..768].copy_from_slice(&self.pal);
binfo
} else {
NABufferType::None
};
let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), bufinfo);
frm.set_keyframe(is_intra);
let ftype = if is_skip { FrameType::Skip } else if is_intra { FrameType::I } else { FrameType::P };
frm.set_frame_type(ftype);
Ok(frm.into_ref())
}
fn flush(&mut self) {
}
}
impl NAOptionHandler for IMAXDecoder {
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(IMAXDecoder::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 crate::game_register_all_demuxers;
#[test]
fn test_imax_video() {
let mut dmx_reg = RegisteredDemuxers::new();
game_register_all_demuxers(&mut dmx_reg);
let mut dec_reg = RegisteredDecoders::new();
game_register_all_decoders(&mut dec_reg);
// sample from Fable game
test_decoding("fable-imax", "fable-imax", "assets/Game/present.imx",
Some(64), &dmx_reg, &dec_reg,
ExpectedTestResult::MD5([0x775e1326, 0x7aa63674, 0x9b8aec54, 0x5caee2e3]));
}
}
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