[nihav.git] / src / codecs / h263 / decoder.rs

use std::mem;
use frame::*;
use super::super::*;
use super::super::blockdsp;
use super::*;
use super::code::*;
use formats;

#[allow(dead_code)]
struct MVInfo {
    mv:         Vec<MV>,
    mb_w:       usize,
    mb_stride:  usize,
    mb_start:   usize,
    top:        bool,
    mvmode:     MVMode,
}

impl MVInfo {
    fn new() -> Self { MVInfo{ mv: Vec::new(), mb_w: 0, mb_stride: 0, mb_start: 0, top: true, mvmode: MVMode::Old } }
    fn reset(&mut self, mb_w: usize, mb_start: usize, mvmode: MVMode) {
        self.mb_start  = mb_start;
        self.mb_w      = mb_w;
        self.mb_stride = mb_w * 2;
        self.top       = true;
        self.mv.resize(self.mb_stride * 3, ZERO_MV);
        self.mvmode    = mvmode;
    }
    fn update_row(&mut self) {
        self.mb_start = self.mb_w + 1;
        self.top      = false;
        for i in 0..self.mb_stride {
            self.mv[i] = self.mv[self.mb_stride * 2 + i];
        }
    }
    #[allow(non_snake_case)]
    fn predict(&mut self, mb_x: usize, blk_no: usize, use4: bool, diff: MV) -> MV {
        let A;
        let B;
        let C;
        let last = mb_x == self.mb_w - 1;
        match blk_no {
            0 => {
                    if mb_x != self.mb_start {
                        A = if mb_x != 0 { self.mv[self.mb_stride + mb_x * 2 - 1] } else { ZERO_MV };
                        B = if !self.top { self.mv[                 mb_x * 2] } else { A };
                        C = if !self.top && !last { self.mv[mb_x * 2 + 2] } else { ZERO_MV };
                    } else {
                        A = ZERO_MV; B = ZERO_MV; C = ZERO_MV;
                    }
                },
            1 => {
                    A = self.mv[self.mb_stride + mb_x * 2];
                    B = if !self.top { self.mv[mb_x * 2 + 1] } else { A };
                    C = if !self.top && !last { self.mv[mb_x * 2 + 2] } else { A };
                },
            2 => {
                    A = if mb_x != self.mb_start { self.mv[self.mb_stride * 2 + mb_x * 2 - 1] } else { ZERO_MV };
                    B = self.mv[self.mb_stride + mb_x * 2];
                    C = self.mv[self.mb_stride + mb_x * 2 + 1];
                },
            3 => {
                    A = self.mv[self.mb_stride * 2 + mb_x * 2];
                    B = self.mv[self.mb_stride * 1 + mb_x * 2 + 1];
                    C = self.mv[self.mb_stride * 1 + mb_x * 2];
                },
            _ => { return ZERO_MV; }
        }
        let pred_mv = MV::pred(A, B, C);
        let new_mv = MV::add_umv(pred_mv, diff, self.mvmode);
        if !use4 {
            self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = new_mv;
            self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = new_mv;
            self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = new_mv;
            self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = new_mv;
        } else {
            match blk_no {
                0 => { self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = new_mv; },
                1 => { self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = new_mv; },
                2 => { self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = new_mv; },
                3 => { self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = new_mv; },
                _ => {},
            };
        }
        
        new_mv
    }
    fn set_zero_mv(&mut self, mb_x: usize) {
        self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = ZERO_MV;
        self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = ZERO_MV;
        self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = ZERO_MV;
        self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = ZERO_MV;
    }
}

#[allow(dead_code)]
#[derive(Clone,Copy)]
struct BMB {
    num_mv: usize,
    mv_f:   [MV; 4],
    mv_b:   [MV; 4],
    fwd:    bool,
    blk:    [[i16; 64]; 6],
    cbp:    u8,
}

impl BMB {
    fn new() -> Self { BMB {blk: [[0; 64]; 6], cbp: 0, fwd: false, mv_f: [ZERO_MV; 4], mv_b: [ZERO_MV; 4], num_mv: 0} }
}

#[derive(Clone,Copy)]
struct PredCoeffs {
    hor: [[i16; 8]; 6],
    ver: [[i16; 8]; 6],
}

const ZERO_PRED_COEFFS: PredCoeffs = PredCoeffs { hor: [[0; 8]; 6], ver: [[0; 8]; 6] };

pub struct H263BaseDecoder {
    w:          usize,
    h:          usize,
    mb_w:       usize,
    mb_h:       usize,
    num_mb:     usize,
    ftype:      Type,
    prev_frm:   Option<NAVideoBuffer<u8>>,
    cur_frm:    Option<NAVideoBuffer<u8>>,
    last_ts:    u8,
    has_b:      bool,
    b_data:     Vec<BMB>,
    pred_coeffs: Vec<PredCoeffs>,
    is_gob:     bool,
}

#[inline]
fn clip_dc(dc: i16) -> i16 {
    if dc < 0 { 0 }
    else if dc > 2046 { 2046 }
    else { (dc + 1) & !1 }
}

#[inline]
fn clip_ac(ac: i16) -> i16 {
    if ac < -2048 { -2048 }
    else if ac > 2047 { 2047 }
    else { ac }
}

#[allow(dead_code)]
impl H263BaseDecoder {
    pub fn new(is_gob: bool) -> Self {
        H263BaseDecoder{
            w: 0, h: 0, mb_w: 0, mb_h: 0, num_mb: 0,
            ftype: Type::Special,
            prev_frm: None, cur_frm: None,
            last_ts: 0,
            has_b: false, b_data: Vec::new(),
            pred_coeffs: Vec::new(),
            is_gob: is_gob,
        }
    }

    pub fn is_intra(&self) -> bool { self.ftype == Type::I }
    pub fn get_dimensions(&self) -> (usize, usize) { (self.w, self.h) }

    pub fn parse_frame(&mut self, bd: &mut BlockDecoder, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
        let pinfo = bd.decode_pichdr()?;
        let mut mvi = MVInfo::new();
        let mut cbpi = CBPInfo::new();

//todo handle res change
        self.w = pinfo.w;
        self.h = pinfo.h;
        self.mb_w = (pinfo.w + 15) >> 4;
        self.mb_h = (pinfo.h + 15) >> 4;
        self.num_mb = self.mb_w * self.mb_h;
        self.ftype = pinfo.mode;
        self.has_b = pinfo.is_pb();

        if self.has_b {
            self.b_data.truncate(0);
        }

        mem::swap(&mut self.cur_frm, &mut self.prev_frm);

        let tsdiff = pinfo.ts.wrapping_sub(self.last_ts);
        let bsdiff = if pinfo.is_pb() { pinfo.get_pbinfo().get_trb() } else { 0 };

        let fmt = formats::YUV420_FORMAT;
        let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
        let bufret = alloc_video_buffer(vinfo, 4);
        if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
        let mut bufinfo = bufret.unwrap();
        let mut buf = bufinfo.get_vbuf().unwrap();

        let mut slice = if self.is_gob {
                SliceInfo::get_default_slice(&pinfo)
            } else {
                bd.decode_slice_header(&pinfo)?
            };
        mvi.reset(self.mb_w, 0, pinfo.get_mvmode());
        cbpi.reset(self.mb_w);

        let mut blk: [[i16; 64]; 6] = [[0; 64]; 6];
        let mut sstate = SliceState::new(pinfo.mode == Type::I);
        let mut mb_pos = 0;
        let apply_acpred = (pinfo.mode == Type::I) && pinfo.plusinfo.is_some() && pinfo.plusinfo.unwrap().aic;
        if apply_acpred {
            self.pred_coeffs.truncate(0);
            self.pred_coeffs.resize(self.mb_w * self.mb_h, ZERO_PRED_COEFFS);
        }
        for mb_y in 0..self.mb_h {
            for mb_x in 0..self.mb_w {
                for i in 0..6 { for j in 0..64 { blk[i][j] = 0; } }

                if slice.is_at_end(mb_pos) || (slice.needs_check() && mb_pos > 0 && bd.is_slice_end()) {
                    slice = bd.decode_slice_header(&pinfo)?;
                    //mvi.reset(self.mb_w, mb_x, pinfo.get_mvmode());
                    //cbpi.reset(self.mb_w);
                }

                let binfo = bd.decode_block_header(&pinfo, &slice, &sstate)?;
                let cbp = binfo.get_cbp();
                cbpi.set_cbp(mb_x, cbp);
                cbpi.set_q(mb_x, binfo.get_q());
                if binfo.is_intra() {
                    for i in 0..6 {
                        bd.decode_block_intra(&binfo, &sstate, binfo.get_q(), i, (cbp & (1 << (5 - i))) != 0, &mut blk[i])?;
                        if apply_acpred && (binfo.acpred != ACPredMode::None) {
                            let has_b = (i == 1) || (i == 3) || (mb_x > 0);
                            let has_a = (i == 2) || (i == 3) || (mb_y > 0);
                            let (b_mb, b_blk) = if has_b {
                                    if (i == 1) || (i == 3) {
                                        (mb_pos, i - 1)
                                    } else if i < 4 {
                                        (mb_pos - 1, i + 1)
                                    } else {
                                        (mb_pos - 1, i)
                                    }
                                } else { (0, 0) };
                            let (a_mb, a_blk) = if has_a {
                                    if (i == 2) || (i == 3) {
                                        (mb_pos, i - 2)
                                    } else if i < 4 {
                                        (mb_pos - self.mb_w, i + 2)
                                    } else {
                                        (mb_pos - self.mb_w, i)
                                    }
                                } else { (0, 0) };
                            match binfo.acpred {
                                ACPredMode::DC   => {
                                            let dc;
                                            if has_a && has_b {
                                                dc = (self.pred_coeffs[b_mb].hor[b_blk][0] + self.pred_coeffs[a_mb].ver[a_blk][0]) / 2;
                                            } else if has_a {
                                                dc = self.pred_coeffs[a_mb].ver[a_blk][0];
                                            } else if has_b {
                                                dc = self.pred_coeffs[b_mb].hor[b_blk][0];
                                            } else {
                                                dc = 1024;
                                            }
                                            blk[i][0] = clip_dc(blk[i][0] + dc);
                                        },
                                ACPredMode::Hor  => {
                                        if has_b {
                                            for k in 0..8 {
                                                blk[i][k * 8] += self.pred_coeffs[b_mb].hor[b_blk][k];
                                            }
                                            for k in 1..8 {
                                                blk[i][k * 8] = clip_ac(blk[i][k * 8]);
                                            }
                                        } else {
                                            blk[i][0] += 1024;
                                        }
                                        blk[i][0] = clip_dc(blk[i][0]);
                                    },
                                ACPredMode::Ver  => {
                                        if has_a {
                                            for k in 0..8 {
                                                blk[i][k] += self.pred_coeffs[a_mb].ver[a_blk][k];
                                            }
                                            for k in 1..8 {
                                                blk[i][k] = clip_ac(blk[i][k]);
                                            }
                                        } else {
                                            blk[i][0] += 1024;
                                        }
                                        blk[i][0] = clip_dc(blk[i][0]);
                                    },
                                ACPredMode::None => {},
                            };
                            for t in 0..8 { self.pred_coeffs[mb_pos].hor[i][t] = blk[i][t * 8]; }
                            for t in 0..8 { self.pred_coeffs[mb_pos].ver[i][t] = blk[i][t]; }
                        }
                        h263_idct(&mut blk[i]);
                    }
                    blockdsp::put_blocks(&mut buf, mb_x, mb_y, &blk);
                    mvi.set_zero_mv(mb_x);
                } else if !binfo.is_skipped() {
                    if binfo.get_num_mvs() == 1 {
                        let mv = mvi.predict(mb_x, 0, false, binfo.get_mv(0));
                        if let Some(ref srcbuf) = self.prev_frm {
                            bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, mv);
                        }
                    } else {
                        for blk_no in 0..4 {
                            let mv = mvi.predict(mb_x, blk_no, true, binfo.get_mv(blk_no));
                            if let Some(ref srcbuf) = self.prev_frm {
                                bdsp.copy_blocks(&mut buf, srcbuf,
                                                 mb_x * 16 + (blk_no & 1) * 8,
                                                 mb_y * 16 + (blk_no & 2) * 4, 8, 8, mv);
                            }
                        }
                    }
                    for i in 0..6 {
                        bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
                        h263_idct(&mut blk[i]);
                    }
                    blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
                } else {
                    mvi.set_zero_mv(mb_x);
                    if let Some(ref srcbuf) = self.prev_frm {
                        bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, ZERO_MV);
                    }
                }
                if pinfo.is_pb() {
                    let mut b_mb = BMB::new();
                    let cbp = binfo.get_cbp_b();
                    let bq = (((pinfo.get_pbinfo().get_dbquant() + 5) as u16) * (binfo.get_q() as u16)) >> 2;
                    let bquant;
                    if bq < 1 { bquant = 1; }
                    else if bq > 31 { bquant = 31; }
                    else { bquant = bq as u8; }

                    b_mb.cbp = cbp;
                    for i in 0..6 {
                        bd.decode_block_inter(&binfo, &sstate, bquant, i, (cbp & (1 << (5 - i))) != 0, &mut b_mb.blk[i])?;
                        h263_idct(&mut b_mb.blk[i]);
                    }

                    let is_fwd = !binfo.is_b_fwd();
                    b_mb.fwd = is_fwd;
                    b_mb.num_mv = binfo.get_num_mvs();
                    if binfo.get_num_mvs() == 0 {
                        b_mb.num_mv = 1;
                        b_mb.mv_f[0] = binfo.get_mv2(1);
                        b_mb.mv_b[0] = binfo.get_mv2(0);
                    } else if binfo.get_num_mvs() == 1 {
                        let src_mv = binfo.get_mv(0).scale(bsdiff, tsdiff);
                        let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
                        let mv_b = MV::b_sub(binfo.get_mv(0), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
                        b_mb.mv_f[0] = mv_f;
                        b_mb.mv_b[0] = mv_b;
                    } else {
                        for blk_no in 0..4 {
                            let src_mv = binfo.get_mv(blk_no).scale(bsdiff, tsdiff);
                            let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
                            let mv_b = MV::b_sub(binfo.get_mv(blk_no), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
                            b_mb.mv_f[blk_no] = mv_f;
                            b_mb.mv_b[blk_no] = mv_b;
                        }
                    }
                    self.b_data.push(b_mb);
                }
                sstate.next_mb();
                mb_pos += 1;
            }
            if let Some(plusinfo) = pinfo.plusinfo {
                if plusinfo.deblock {
                    bdsp.filter_row(&mut buf, mb_y, self.mb_w, &cbpi);
                }
            }
            mvi.update_row();
            cbpi.update_row();
            sstate.new_row();
        }
        
        self.cur_frm = Some(buf);
        self.last_ts = pinfo.ts;
        Ok(bufinfo)
    }

    pub fn get_bframe(&mut self, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
        if !self.has_b || !self.cur_frm.is_some() || !self.prev_frm.is_some() {
            return Err(DecoderError::MissingReference);
        }
        self.has_b = false;

        let fmt = formats::YUV420_FORMAT;
        let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
        let bufret = alloc_video_buffer(vinfo, 4);
        if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
        let mut bufinfo = bufret.unwrap();
        let mut b_buf = bufinfo.get_vbuf().unwrap();

        if let Some(ref bck_buf) = self.prev_frm {
            if let Some(ref fwd_buf) = self.cur_frm {
                recon_b_frame(&mut b_buf, bck_buf, fwd_buf, self.mb_w, self.mb_h, &self.b_data, bdsp);
            }
        }

        self.b_data.truncate(0);
        Ok(bufinfo)
    }
}

fn recon_b_frame(b_buf: &mut NAVideoBuffer<u8>, bck_buf: &NAVideoBuffer<u8>, fwd_buf: &NAVideoBuffer<u8>,
                 mb_w: usize, mb_h: usize, b_data: &Vec<BMB>, bdsp: &BlockDSP) {
    let mut cbpi = CBPInfo::new();
    let mut cur_mb = 0;
    cbpi.reset(mb_w);
    for mb_y in 0..mb_h {
        for mb_x in 0..mb_w {
            let num_mv = b_data[cur_mb].num_mv;
            let is_fwd = b_data[cur_mb].fwd;
            let cbp    = b_data[cur_mb].cbp;
            cbpi.set_cbp(mb_x, cbp);
            if num_mv == 1 {
                bdsp.copy_blocks(b_buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_b[0]);
                if !is_fwd {
                    bdsp.avg_blocks(b_buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_f[0]);
                }
            } else {
                for blk_no in 0..4 {
                    let xpos = mb_x * 16 + (blk_no & 1) * 8;
                    let ypos = mb_y * 16 + (blk_no & 2) * 4;
                    bdsp.copy_blocks(b_buf, fwd_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_b[blk_no]);
                    if !is_fwd {
                        bdsp.avg_blocks(b_buf, bck_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_f[blk_no]);
                    }
                }
            }
            if cbp != 0 {
                blockdsp::add_blocks(b_buf, mb_x, mb_y, &b_data[cur_mb].blk);
            }
            cur_mb += 1;
        }
        cbpi.update_row();
    }
}
Commit	Line	Data
cf64af13	1	use std::mem;
88c58b1b KS	2	use frame::*;
	3	use super::super::*;
	4	use super::super::blockdsp;
cf64af13	5	use super::*;
88c58b1b	6	use super::code::*;
cf64af13 KS	7	use formats;
cf64af13 KS	8
cf64af13 KS	9	#[allow(dead_code)]
	10	struct MVInfo {
	11	mv: Vec<MV>,
	12	mb_w: usize,
	13	mb_stride: usize,
	14	mb_start: usize,
	15	top: bool,
2324f30b	16	mvmode: MVMode,
cf64af13 KS	17	}
	18
	19	impl MVInfo {
2324f30b KS	20	fn new() -> Self { MVInfo{ mv: Vec::new(), mb_w: 0, mb_stride: 0, mb_start: 0, top: true, mvmode: MVMode::Old } }
2324f30b KS	21	fn reset(&mut self, mb_w: usize, mb_start: usize, mvmode: MVMode) {
cf64af13 KS	22	self.mb_start = mb_start;
	23	self.mb_w = mb_w;
	24	self.mb_stride = mb_w * 2;
	25	self.top = true;
	26	self.mv.resize(self.mb_stride * 3, ZERO_MV);
2324f30b	27	self.mvmode = mvmode;
cf64af13 KS	28	}
	29	fn update_row(&mut self) {
	30	self.mb_start = self.mb_w + 1;
	31	self.top = false;
	32	for i in 0..self.mb_stride {
	33	self.mv[i] = self.mv[self.mb_stride * 2 + i];
	34	}
	35	}
	36	#[allow(non_snake_case)]
	37	fn predict(&mut self, mb_x: usize, blk_no: usize, use4: bool, diff: MV) -> MV {
	38	let A;
	39	let B;
	40	let C;
	41	let last = mb_x == self.mb_w - 1;
cf64af13 KS	42	match blk_no {
	43	0 => {
	44	if mb_x != self.mb_start {
	45	A = if mb_x != 0 { self.mv[self.mb_stride + mb_x * 2 - 1] } else { ZERO_MV };
	46	B = if !self.top { self.mv[ mb_x * 2] } else { A };
	47	C = if !self.top && !last { self.mv[mb_x * 2 + 2] } else { ZERO_MV };
	48	} else {
	49	A = ZERO_MV; B = ZERO_MV; C = ZERO_MV;
	50	}
	51	},
	52	1 => {
	53	A = self.mv[self.mb_stride + mb_x * 2];
	54	B = if !self.top { self.mv[mb_x * 2 + 1] } else { A };
	55	C = if !self.top && !last { self.mv[mb_x * 2 + 2] } else { A };
	56	},
	57	2 => {
	58	A = if mb_x != self.mb_start { self.mv[self.mb_stride * 2 + mb_x * 2 - 1] } else { ZERO_MV };
	59	B = self.mv[self.mb_stride + mb_x * 2];
	60	C = self.mv[self.mb_stride + mb_x * 2 + 1];
	61	},
	62	3 => {
	63	A = self.mv[self.mb_stride * 2 + mb_x * 2];
	64	B = self.mv[self.mb_stride * 1 + mb_x * 2 + 1];
	65	C = self.mv[self.mb_stride * 1 + mb_x * 2];
	66	},
	67	_ => { return ZERO_MV; }
	68	}
cf64af13	69	let pred_mv = MV::pred(A, B, C);
2324f30b	70	let new_mv = MV::add_umv(pred_mv, diff, self.mvmode);
cf64af13 KS	71	if !use4 {
	72	self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = new_mv;
	73	self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = new_mv;
	74	self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = new_mv;
	75	self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = new_mv;
	76	} else {
	77	match blk_no {
	78	0 => { self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = new_mv; },
	79	1 => { self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = new_mv; },
	80	2 => { self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = new_mv; },
	81	3 => { self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = new_mv; },
	82	_ => {},
	83	};
	84	}
	85
	86	new_mv
	87	}
	88	fn set_zero_mv(&mut self, mb_x: usize) {
	89	self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = ZERO_MV;
	90	self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = ZERO_MV;
	91	self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = ZERO_MV;
	92	self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = ZERO_MV;
	93	}
	94	}
	95
21c16d5f KS	96	#[allow(dead_code)]
	97	#[derive(Clone,Copy)]
	98	struct BMB {
	99	num_mv: usize,
	100	mv_f: [MV; 4],
	101	mv_b: [MV; 4],
	102	fwd: bool,
	103	blk: [[i16; 64]; 6],
	104	cbp: u8,
	105	}
	106
	107	impl BMB {
	108	fn new() -> Self { BMB {blk: [[0; 64]; 6], cbp: 0, fwd: false, mv_f: [ZERO_MV; 4], mv_b: [ZERO_MV; 4], num_mv: 0} }
	109	}
	110
ef3209c7 KS	111	#[derive(Clone,Copy)]
	112	struct PredCoeffs {
	113	hor: [[i16; 8]; 6],
	114	ver: [[i16; 8]; 6],
	115	}
	116
	117	const ZERO_PRED_COEFFS: PredCoeffs = PredCoeffs { hor: [[0; 8]; 6], ver: [[0; 8]; 6] };
	118
88c58b1b	119	pub struct H263BaseDecoder {
cf64af13 KS	120	w: usize,
	121	h: usize,
	122	mb_w: usize,
	123	mb_h: usize,
	124	num_mb: usize,
	125	ftype: Type,
	126	prev_frm: Option<NAVideoBuffer<u8>>,
	127	cur_frm: Option<NAVideoBuffer<u8>>,
21c16d5f KS	128	last_ts: u8,
	129	has_b: bool,
	130	b_data: Vec<BMB>,
ef3209c7	131	pred_coeffs: Vec<PredCoeffs>,
42a59352	132	is_gob: bool,
ef3209c7 KS	133	}
	134
	135	#[inline]
	136	fn clip_dc(dc: i16) -> i16 {
	137	if dc < 0 { 0 }
	138	else if dc > 2046 { 2046 }
	139	else { (dc + 1) & !1 }
	140	}
	141
	142	#[inline]
	143	fn clip_ac(ac: i16) -> i16 {
	144	if ac < -2048 { -2048 }
	145	else if ac > 2047 { 2047 }
	146	else { ac }
cf64af13 KS	147	}
	148
	149	#[allow(dead_code)]
88c58b1b	150	impl H263BaseDecoder {
42a59352	151	pub fn new(is_gob: bool) -> Self {
88c58b1b	152	H263BaseDecoder{
cf64af13 KS	153	w: 0, h: 0, mb_w: 0, mb_h: 0, num_mb: 0,
	154	ftype: Type::Special,
	155	prev_frm: None, cur_frm: None,
21c16d5f KS	156	last_ts: 0,
21c16d5f KS	157	has_b: false, b_data: Vec::new(),
ef3209c7	158	pred_coeffs: Vec::new(),
42a59352	159	is_gob: is_gob,
cf64af13 KS	160	}
	161	}
	162
	163	pub fn is_intra(&self) -> bool { self.ftype == Type::I }
	164	pub fn get_dimensions(&self) -> (usize, usize) { (self.w, self.h) }
	165
2a2aa421	166	pub fn parse_frame(&mut self, bd: &mut BlockDecoder, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
cf64af13	167	let pinfo = bd.decode_pichdr()?;
21c16d5f	168	let mut mvi = MVInfo::new();
f2f1afb2	169	let mut cbpi = CBPInfo::new();
cf64af13 KS	170
	171	//todo handle res change
	172	self.w = pinfo.w;
	173	self.h = pinfo.h;
	174	self.mb_w = (pinfo.w + 15) >> 4;
	175	self.mb_h = (pinfo.h + 15) >> 4;
	176	self.num_mb = self.mb_w * self.mb_h;
	177	self.ftype = pinfo.mode;
21c16d5f KS	178	self.has_b = pinfo.is_pb();
	179
	180	if self.has_b {
	181	self.b_data.truncate(0);
	182	}
cf64af13 KS	183
cf64af13 KS	184	mem::swap(&mut self.cur_frm, &mut self.prev_frm);
cf64af13	185
21c16d5f KS	186	let tsdiff = pinfo.ts.wrapping_sub(self.last_ts);
	187	let bsdiff = if pinfo.is_pb() { pinfo.get_pbinfo().get_trb() } else { 0 };
	188
cf64af13 KS	189	let fmt = formats::YUV420_FORMAT;
	190	let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
	191	let bufret = alloc_video_buffer(vinfo, 4);
	192	if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
	193	let mut bufinfo = bufret.unwrap();
	194	let mut buf = bufinfo.get_vbuf().unwrap();
	195
42a59352	196	let mut slice = if self.is_gob {
2a2aa421 KS	197	SliceInfo::get_default_slice(&pinfo)
	198	} else {
	199	bd.decode_slice_header(&pinfo)?
	200	};
2324f30b	201	mvi.reset(self.mb_w, 0, pinfo.get_mvmode());
f2f1afb2	202	cbpi.reset(self.mb_w);
cf64af13 KS	203
cf64af13 KS	204	let mut blk: [[i16; 64]; 6] = [[0; 64]; 6];
2a2aa421 KS	205	let mut sstate = SliceState::new(pinfo.mode == Type::I);
2a2aa421 KS	206	let mut mb_pos = 0;
ef3209c7 KS	207	let apply_acpred = (pinfo.mode == Type::I) && pinfo.plusinfo.is_some() && pinfo.plusinfo.unwrap().aic;
	208	if apply_acpred {
	209	self.pred_coeffs.truncate(0);
	210	self.pred_coeffs.resize(self.mb_w * self.mb_h, ZERO_PRED_COEFFS);
	211	}
cf64af13 KS	212	for mb_y in 0..self.mb_h {
	213	for mb_x in 0..self.mb_w {
	214	for i in 0..6 { for j in 0..64 { blk[i][j] = 0; } }
	215
2a2aa421	216	if slice.is_at_end(mb_pos) \|\| (slice.needs_check() && mb_pos > 0 && bd.is_slice_end()) {
cf64af13	217	slice = bd.decode_slice_header(&pinfo)?;
2324f30b	218	//mvi.reset(self.mb_w, mb_x, pinfo.get_mvmode());
f2f1afb2	219	//cbpi.reset(self.mb_w);
cf64af13 KS	220	}
cf64af13 KS	221
2a2aa421	222	let binfo = bd.decode_block_header(&pinfo, &slice, &sstate)?;
cf64af13	223	let cbp = binfo.get_cbp();
f2f1afb2 KS	224	cbpi.set_cbp(mb_x, cbp);
f2f1afb2 KS	225	cbpi.set_q(mb_x, binfo.get_q());
cf64af13 KS	226	if binfo.is_intra() {
cf64af13 KS	227	for i in 0..6 {
2a2aa421	228	bd.decode_block_intra(&binfo, &sstate, binfo.get_q(), i, (cbp & (1 << (5 - i))) != 0, &mut blk[i])?;
ef3209c7 KS	229	if apply_acpred && (binfo.acpred != ACPredMode::None) {
	230	let has_b = (i == 1) \|\| (i == 3) \|\| (mb_x > 0);
	231	let has_a = (i == 2) \|\| (i == 3) \|\| (mb_y > 0);
	232	let (b_mb, b_blk) = if has_b {
	233	if (i == 1) \|\| (i == 3) {
	234	(mb_pos, i - 1)
	235	} else if i < 4 {
	236	(mb_pos - 1, i + 1)
	237	} else {
	238	(mb_pos - 1, i)
	239	}
	240	} else { (0, 0) };
	241	let (a_mb, a_blk) = if has_a {
	242	if (i == 2) \|\| (i == 3) {
	243	(mb_pos, i - 2)
	244	} else if i < 4 {
	245	(mb_pos - self.mb_w, i + 2)
	246	} else {
	247	(mb_pos - self.mb_w, i)
	248	}
	249	} else { (0, 0) };
	250	match binfo.acpred {
	251	ACPredMode::DC => {
	252	let dc;
	253	if has_a && has_b {
	254	dc = (self.pred_coeffs[b_mb].hor[b_blk][0] + self.pred_coeffs[a_mb].ver[a_blk][0]) / 2;
	255	} else if has_a {
	256	dc = self.pred_coeffs[a_mb].ver[a_blk][0];
	257	} else if has_b {
	258	dc = self.pred_coeffs[b_mb].hor[b_blk][0];
	259	} else {
	260	dc = 1024;
	261	}
	262	blk[i][0] = clip_dc(blk[i][0] + dc);
	263	},
	264	ACPredMode::Hor => {
	265	if has_b {
	266	for k in 0..8 {
	267	blk[i][k * 8] += self.pred_coeffs[b_mb].hor[b_blk][k];
	268	}
	269	for k in 1..8 {
	270	blk[i][k * 8] = clip_ac(blk[i][k * 8]);
	271	}
	272	} else {
	273	blk[i][0] += 1024;
	274	}
	275	blk[i][0] = clip_dc(blk[i][0]);
	276	},
	277	ACPredMode::Ver => {
	278	if has_a {
	279	for k in 0..8 {
	280	blk[i][k] += self.pred_coeffs[a_mb].ver[a_blk][k];
	281	}
	282	for k in 1..8 {
	283	blk[i][k] = clip_ac(blk[i][k]);
	284	}
	285	} else {
	286	blk[i][0] += 1024;
	287	}
	288	blk[i][0] = clip_dc(blk[i][0]);
	289	},
	290	ACPredMode::None => {},
	291	};
	292	for t in 0..8 { self.pred_coeffs[mb_pos].hor[i][t] = blk[i][t * 8]; }
293	for t in 0..8 { self.pred_coeffs[mb_pos].ver[i][t] = blk[i][t]; }
294	}
cf64af13 KS	295	h263_idct(&mut blk[i]);
	296	}
	297	blockdsp::put_blocks(&mut buf, mb_x, mb_y, &blk);
	298	mvi.set_zero_mv(mb_x);
	299	} else if !binfo.is_skipped() {
	300	if binfo.get_num_mvs() == 1 {
	301	let mv = mvi.predict(mb_x, 0, false, binfo.get_mv(0));
cf64af13	302	if let Some(ref srcbuf) = self.prev_frm {
2a2aa421	303	bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, mv);
cf64af13 KS	304	}
	305	} else {
	306	for blk_no in 0..4 {
	307	let mv = mvi.predict(mb_x, blk_no, true, binfo.get_mv(blk_no));
cf64af13	308	if let Some(ref srcbuf) = self.prev_frm {
2a2aa421 KS	309	bdsp.copy_blocks(&mut buf, srcbuf,
	310	mb_x * 16 + (blk_no & 1) * 8,
	311	mb_y * 16 + (blk_no & 2) * 4, 8, 8, mv);
cf64af13 KS	312	}
cf64af13 KS	313	}
cf64af13 KS	314	}
cf64af13 KS	315	for i in 0..6 {
2a2aa421	316	bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
cf64af13 KS	317	h263_idct(&mut blk[i]);
	318	}
	319	blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
	320	} else {
	321	mvi.set_zero_mv(mb_x);
	322	if let Some(ref srcbuf) = self.prev_frm {
2a2aa421	323	bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, ZERO_MV);
cf64af13 KS	324	}
cf64af13 KS	325	}
21c16d5f KS	326	if pinfo.is_pb() {
21c16d5f KS	327	let mut b_mb = BMB::new();
cf64af13	328	let cbp = binfo.get_cbp_b();
21c16d5f KS	329	let bq = (((pinfo.get_pbinfo().get_dbquant() + 5) as u16) * (binfo.get_q() as u16)) >> 2;
	330	let bquant;
	331	if bq < 1 { bquant = 1; }
	332	else if bq > 31 { bquant = 31; }
	333	else { bquant = bq as u8; }
	334
	335	b_mb.cbp = cbp;
cf64af13	336	for i in 0..6 {
2a2aa421	337	bd.decode_block_inter(&binfo, &sstate, bquant, i, (cbp & (1 << (5 - i))) != 0, &mut b_mb.blk[i])?;
21c16d5f	338	h263_idct(&mut b_mb.blk[i]);
cf64af13	339	}
21c16d5f	340
88c58b1b	341	let is_fwd = !binfo.is_b_fwd();
21c16d5f KS	342	b_mb.fwd = is_fwd;
	343	b_mb.num_mv = binfo.get_num_mvs();
	344	if binfo.get_num_mvs() == 0 {
	345	b_mb.num_mv = 1;
	346	b_mb.mv_f[0] = binfo.get_mv2(1);
	347	b_mb.mv_b[0] = binfo.get_mv2(0);
88c58b1b KS	348	} else if binfo.get_num_mvs() == 1 {
88c58b1b KS	349	let src_mv = binfo.get_mv(0).scale(bsdiff, tsdiff);
2324f30b	350	let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
21c16d5f KS	351	let mv_b = MV::b_sub(binfo.get_mv(0), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
	352	b_mb.mv_f[0] = mv_f;
	353	b_mb.mv_b[0] = mv_b;
	354	} else {
	355	for blk_no in 0..4 {
88c58b1b	356	let src_mv = binfo.get_mv(blk_no).scale(bsdiff, tsdiff);
2324f30b	357	let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
21c16d5f KS	358	let mv_b = MV::b_sub(binfo.get_mv(blk_no), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
	359	b_mb.mv_f[blk_no] = mv_f;
	360	b_mb.mv_b[blk_no] = mv_b;
cf64af13 KS	361	}
cf64af13 KS	362	}
21c16d5f	363	self.b_data.push(b_mb);
cf64af13	364	}
2a2aa421 KS	365	sstate.next_mb();
2a2aa421 KS	366	mb_pos += 1;
cf64af13	367	}
2a2aa421 KS	368	if let Some(plusinfo) = pinfo.plusinfo {
	369	if plusinfo.deblock {
	370	bdsp.filter_row(&mut buf, mb_y, self.mb_w, &cbpi);
	371	}
f2f1afb2	372	}
cf64af13	373	mvi.update_row();
f2f1afb2	374	cbpi.update_row();
2a2aa421	375	sstate.new_row();
cf64af13	376	}
f2f1afb2	377
cf64af13	378	self.cur_frm = Some(buf);
21c16d5f	379	self.last_ts = pinfo.ts;
cf64af13 KS	380	Ok(bufinfo)
	381	}
	382
2a2aa421	383	pub fn get_bframe(&mut self, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
21c16d5f KS	384	if !self.has_b \|\| !self.cur_frm.is_some() \|\| !self.prev_frm.is_some() {
	385	return Err(DecoderError::MissingReference);
	386	}
	387	self.has_b = false;
	388
	389	let fmt = formats::YUV420_FORMAT;
	390	let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
	391	let bufret = alloc_video_buffer(vinfo, 4);
	392	if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
	393	let mut bufinfo = bufret.unwrap();
	394	let mut b_buf = bufinfo.get_vbuf().unwrap();
	395
	396	if let Some(ref bck_buf) = self.prev_frm {
	397	if let Some(ref fwd_buf) = self.cur_frm {
2a2aa421	398	recon_b_frame(&mut b_buf, bck_buf, fwd_buf, self.mb_w, self.mb_h, &self.b_data, bdsp);
21c16d5f KS	399	}
	400	}
	401
	402	self.b_data.truncate(0);
	403	Ok(bufinfo)
	404	}
	405	}
	406
	407	fn recon_b_frame(b_buf: &mut NAVideoBuffer<u8>, bck_buf: &NAVideoBuffer<u8>, fwd_buf: &NAVideoBuffer<u8>,
2a2aa421	408	mb_w: usize, mb_h: usize, b_data: &Vec<BMB>, bdsp: &BlockDSP) {
f2f1afb2	409	let mut cbpi = CBPInfo::new();
21c16d5f	410	let mut cur_mb = 0;
f2f1afb2	411	cbpi.reset(mb_w);
21c16d5f KS	412	for mb_y in 0..mb_h {
	413	for mb_x in 0..mb_w {
	414	let num_mv = b_data[cur_mb].num_mv;
	415	let is_fwd = b_data[cur_mb].fwd;
f2f1afb2 KS	416	let cbp = b_data[cur_mb].cbp;
	417	cbpi.set_cbp(mb_x, cbp);
	418	if num_mv == 1 {
2a2aa421	419	bdsp.copy_blocks(b_buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_b[0]);
21c16d5f	420	if !is_fwd {
2a2aa421	421	bdsp.avg_blocks(b_buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_f[0]);
21c16d5f KS	422	}
	423	} else {
	424	for blk_no in 0..4 {
	425	let xpos = mb_x * 16 + (blk_no & 1) * 8;
	426	let ypos = mb_y * 16 + (blk_no & 2) * 4;
2a2aa421	427	bdsp.copy_blocks(b_buf, fwd_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_b[blk_no]);
21c16d5f	428	if !is_fwd {
2a2aa421	429	bdsp.avg_blocks(b_buf, bck_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_f[blk_no]);
21c16d5f KS	430	}
	431	}
	432	}
f2f1afb2	433	if cbp != 0 {
21c16d5f KS	434	blockdsp::add_blocks(b_buf, mb_x, mb_y, &b_data[cur_mb].blk);
	435	}
	436	cur_mb += 1;
cf64af13	437	}
f2f1afb2	438	cbpi.update_row();
cf64af13 KS	439	}
cf64af13 KS	440	}