[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} }
}

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>,
}

#[allow(dead_code)]
impl H263BaseDecoder {
    pub fn new() -> 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(),
        }
    }

    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 bd.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;
        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])?;
                        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
88c58b1b	111	pub struct H263BaseDecoder {
cf64af13 KS	112	w: usize,
	113	h: usize,
	114	mb_w: usize,
	115	mb_h: usize,
	116	num_mb: usize,
	117	ftype: Type,
	118	prev_frm: Option<NAVideoBuffer<u8>>,
	119	cur_frm: Option<NAVideoBuffer<u8>>,
21c16d5f KS	120	last_ts: u8,
	121	has_b: bool,
	122	b_data: Vec<BMB>,
cf64af13 KS	123	}
	124
	125	#[allow(dead_code)]
88c58b1b	126	impl H263BaseDecoder {
cf64af13	127	pub fn new() -> Self {
88c58b1b	128	H263BaseDecoder{
cf64af13 KS	129	w: 0, h: 0, mb_w: 0, mb_h: 0, num_mb: 0,
	130	ftype: Type::Special,
	131	prev_frm: None, cur_frm: None,
21c16d5f KS	132	last_ts: 0,
21c16d5f KS	133	has_b: false, b_data: Vec::new(),
cf64af13 KS	134	}
	135	}
	136
	137	pub fn is_intra(&self) -> bool { self.ftype == Type::I }
	138	pub fn get_dimensions(&self) -> (usize, usize) { (self.w, self.h) }
	139
2a2aa421	140	pub fn parse_frame(&mut self, bd: &mut BlockDecoder, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
cf64af13	141	let pinfo = bd.decode_pichdr()?;
21c16d5f	142	let mut mvi = MVInfo::new();
f2f1afb2	143	let mut cbpi = CBPInfo::new();
cf64af13 KS	144
	145	//todo handle res change
	146	self.w = pinfo.w;
	147	self.h = pinfo.h;
	148	self.mb_w = (pinfo.w + 15) >> 4;
	149	self.mb_h = (pinfo.h + 15) >> 4;
	150	self.num_mb = self.mb_w * self.mb_h;
	151	self.ftype = pinfo.mode;
21c16d5f KS	152	self.has_b = pinfo.is_pb();
	153
	154	if self.has_b {
	155	self.b_data.truncate(0);
	156	}
cf64af13 KS	157
cf64af13 KS	158	mem::swap(&mut self.cur_frm, &mut self.prev_frm);
cf64af13	159
21c16d5f KS	160	let tsdiff = pinfo.ts.wrapping_sub(self.last_ts);
	161	let bsdiff = if pinfo.is_pb() { pinfo.get_pbinfo().get_trb() } else { 0 };
	162
cf64af13 KS	163	let fmt = formats::YUV420_FORMAT;
	164	let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
	165	let bufret = alloc_video_buffer(vinfo, 4);
	166	if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
	167	let mut bufinfo = bufret.unwrap();
	168	let mut buf = bufinfo.get_vbuf().unwrap();
	169
2a2aa421 KS	170	let mut slice = if bd.is_gob() {
	171	SliceInfo::get_default_slice(&pinfo)
	172	} else {
	173	bd.decode_slice_header(&pinfo)?
	174	};
2324f30b	175	mvi.reset(self.mb_w, 0, pinfo.get_mvmode());
f2f1afb2	176	cbpi.reset(self.mb_w);
cf64af13 KS	177
cf64af13 KS	178	let mut blk: [[i16; 64]; 6] = [[0; 64]; 6];
2a2aa421 KS	179	let mut sstate = SliceState::new(pinfo.mode == Type::I);
2a2aa421 KS	180	let mut mb_pos = 0;
cf64af13 KS	181	for mb_y in 0..self.mb_h {
	182	for mb_x in 0..self.mb_w {
	183	for i in 0..6 { for j in 0..64 { blk[i][j] = 0; } }
	184
2a2aa421	185	if slice.is_at_end(mb_pos) \|\| (slice.needs_check() && mb_pos > 0 && bd.is_slice_end()) {
cf64af13	186	slice = bd.decode_slice_header(&pinfo)?;
2324f30b	187	//mvi.reset(self.mb_w, mb_x, pinfo.get_mvmode());
f2f1afb2	188	//cbpi.reset(self.mb_w);
cf64af13 KS	189	}
cf64af13 KS	190
2a2aa421	191	let binfo = bd.decode_block_header(&pinfo, &slice, &sstate)?;
cf64af13	192	let cbp = binfo.get_cbp();
f2f1afb2 KS	193	cbpi.set_cbp(mb_x, cbp);
f2f1afb2 KS	194	cbpi.set_q(mb_x, binfo.get_q());
cf64af13 KS	195	if binfo.is_intra() {
cf64af13 KS	196	for i in 0..6 {
2a2aa421	197	bd.decode_block_intra(&binfo, &sstate, binfo.get_q(), i, (cbp & (1 << (5 - i))) != 0, &mut blk[i])?;
cf64af13 KS	198	h263_idct(&mut blk[i]);
	199	}
	200	blockdsp::put_blocks(&mut buf, mb_x, mb_y, &blk);
	201	mvi.set_zero_mv(mb_x);
	202	} else if !binfo.is_skipped() {
	203	if binfo.get_num_mvs() == 1 {
	204	let mv = mvi.predict(mb_x, 0, false, binfo.get_mv(0));
cf64af13	205	if let Some(ref srcbuf) = self.prev_frm {
2a2aa421	206	bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, mv);
cf64af13 KS	207	}
	208	} else {
	209	for blk_no in 0..4 {
	210	let mv = mvi.predict(mb_x, blk_no, true, binfo.get_mv(blk_no));
cf64af13	211	if let Some(ref srcbuf) = self.prev_frm {
2a2aa421 KS	212	bdsp.copy_blocks(&mut buf, srcbuf,
	213	mb_x * 16 + (blk_no & 1) * 8,
	214	mb_y * 16 + (blk_no & 2) * 4, 8, 8, mv);
cf64af13 KS	215	}
cf64af13 KS	216	}
cf64af13 KS	217	}
cf64af13 KS	218	for i in 0..6 {
2a2aa421	219	bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
cf64af13 KS	220	h263_idct(&mut blk[i]);
	221	}
	222	blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
	223	} else {
	224	mvi.set_zero_mv(mb_x);
	225	if let Some(ref srcbuf) = self.prev_frm {
2a2aa421	226	bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, ZERO_MV);
cf64af13 KS	227	}
cf64af13 KS	228	}
21c16d5f KS	229	if pinfo.is_pb() {
21c16d5f KS	230	let mut b_mb = BMB::new();
cf64af13	231	let cbp = binfo.get_cbp_b();
21c16d5f KS	232	let bq = (((pinfo.get_pbinfo().get_dbquant() + 5) as u16) * (binfo.get_q() as u16)) >> 2;
	233	let bquant;
	234	if bq < 1 { bquant = 1; }
	235	else if bq > 31 { bquant = 31; }
	236	else { bquant = bq as u8; }
	237
	238	b_mb.cbp = cbp;
cf64af13	239	for i in 0..6 {
2a2aa421	240	bd.decode_block_inter(&binfo, &sstate, bquant, i, (cbp & (1 << (5 - i))) != 0, &mut b_mb.blk[i])?;
21c16d5f	241	h263_idct(&mut b_mb.blk[i]);
cf64af13	242	}
21c16d5f	243
88c58b1b	244	let is_fwd = !binfo.is_b_fwd();
21c16d5f KS	245	b_mb.fwd = is_fwd;
	246	b_mb.num_mv = binfo.get_num_mvs();
	247	if binfo.get_num_mvs() == 0 {
	248	b_mb.num_mv = 1;
	249	b_mb.mv_f[0] = binfo.get_mv2(1);
	250	b_mb.mv_b[0] = binfo.get_mv2(0);
88c58b1b KS	251	} else if binfo.get_num_mvs() == 1 {
88c58b1b KS	252	let src_mv = binfo.get_mv(0).scale(bsdiff, tsdiff);
2324f30b	253	let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
21c16d5f KS	254	let mv_b = MV::b_sub(binfo.get_mv(0), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
	255	b_mb.mv_f[0] = mv_f;
	256	b_mb.mv_b[0] = mv_b;
	257	} else {
	258	for blk_no in 0..4 {
88c58b1b	259	let src_mv = binfo.get_mv(blk_no).scale(bsdiff, tsdiff);
2324f30b	260	let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
21c16d5f KS	261	let mv_b = MV::b_sub(binfo.get_mv(blk_no), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
	262	b_mb.mv_f[blk_no] = mv_f;
	263	b_mb.mv_b[blk_no] = mv_b;
cf64af13 KS	264	}
cf64af13 KS	265	}
21c16d5f	266	self.b_data.push(b_mb);
cf64af13	267	}
2a2aa421 KS	268	sstate.next_mb();
2a2aa421 KS	269	mb_pos += 1;
cf64af13	270	}
2a2aa421 KS	271	if let Some(plusinfo) = pinfo.plusinfo {
	272	if plusinfo.deblock {
	273	bdsp.filter_row(&mut buf, mb_y, self.mb_w, &cbpi);
	274	}
f2f1afb2	275	}
cf64af13	276	mvi.update_row();
f2f1afb2	277	cbpi.update_row();
2a2aa421	278	sstate.new_row();
cf64af13	279	}
f2f1afb2	280
cf64af13	281	self.cur_frm = Some(buf);
21c16d5f	282	self.last_ts = pinfo.ts;
cf64af13 KS	283	Ok(bufinfo)
	284	}
	285
2a2aa421	286	pub fn get_bframe(&mut self, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
21c16d5f KS	287	if !self.has_b \|\| !self.cur_frm.is_some() \|\| !self.prev_frm.is_some() {
	288	return Err(DecoderError::MissingReference);
	289	}
	290	self.has_b = false;
	291
	292	let fmt = formats::YUV420_FORMAT;
	293	let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
	294	let bufret = alloc_video_buffer(vinfo, 4);
	295	if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
	296	let mut bufinfo = bufret.unwrap();
	297	let mut b_buf = bufinfo.get_vbuf().unwrap();
	298
	299	if let Some(ref bck_buf) = self.prev_frm {
	300	if let Some(ref fwd_buf) = self.cur_frm {
2a2aa421	301	recon_b_frame(&mut b_buf, bck_buf, fwd_buf, self.mb_w, self.mb_h, &self.b_data, bdsp);
21c16d5f KS	302	}
	303	}
	304
	305	self.b_data.truncate(0);
	306	Ok(bufinfo)
	307	}
	308	}
	309
	310	fn recon_b_frame(b_buf: &mut NAVideoBuffer<u8>, bck_buf: &NAVideoBuffer<u8>, fwd_buf: &NAVideoBuffer<u8>,
2a2aa421	311	mb_w: usize, mb_h: usize, b_data: &Vec<BMB>, bdsp: &BlockDSP) {
f2f1afb2	312	let mut cbpi = CBPInfo::new();
21c16d5f	313	let mut cur_mb = 0;
f2f1afb2	314	cbpi.reset(mb_w);
21c16d5f KS	315	for mb_y in 0..mb_h {
	316	for mb_x in 0..mb_w {
	317	let num_mv = b_data[cur_mb].num_mv;
	318	let is_fwd = b_data[cur_mb].fwd;
f2f1afb2 KS	319	let cbp = b_data[cur_mb].cbp;
	320	cbpi.set_cbp(mb_x, cbp);
	321	if num_mv == 1 {
2a2aa421	322	bdsp.copy_blocks(b_buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_b[0]);
21c16d5f	323	if !is_fwd {
2a2aa421	324	bdsp.avg_blocks(b_buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_f[0]);
21c16d5f KS	325	}
	326	} else {
	327	for blk_no in 0..4 {
	328	let xpos = mb_x * 16 + (blk_no & 1) * 8;
	329	let ypos = mb_y * 16 + (blk_no & 2) * 4;
2a2aa421	330	bdsp.copy_blocks(b_buf, fwd_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_b[blk_no]);
21c16d5f	331	if !is_fwd {
2a2aa421	332	bdsp.avg_blocks(b_buf, bck_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_f[blk_no]);
21c16d5f KS	333	}
	334	}
	335	}
f2f1afb2	336	if cbp != 0 {
21c16d5f KS	337	blockdsp::add_blocks(b_buf, mb_x, mb_y, &b_data[cur_mb].blk);
	338	}
	339	cur_mb += 1;
cf64af13	340	}
f2f1afb2	341	cbpi.update_row();
cf64af13 KS	342	}
cf64af13 KS	343	}