[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.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, first_line: bool, first_mb: bool) -> 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 !first_mb   { self.mv[self.mb_stride + mb_x * 2 - 1] } else { ZERO_MV };
                        B = if !first_line { self.mv[                 mb_x * 2] } else { A };
                        C = if !first_line && !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 !first_line { self.mv[mb_x * 2 + 1] } else { A };
                    C = if !first_line && !last { self.mv[mb_x * 2 + 2] } else { ZERO_MV/*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;
    }
    fn get_mv(&self, mb_x: usize, blk_no: usize) -> MV {
        self.mv[self.mb_stride + mb_x * 2 + (blk_no & 1) + (blk_no >> 1) * self.mb_stride]
    }
}

#[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,
    ipbs:       IPBShuffler,
    next_ts:    u16,
    last_ts:    u16,
    tsdiff:     u16,
    has_b:      bool,
    b_data:     Vec<BMB>,
    pred_coeffs: Vec<PredCoeffs>,
    is_gob:     bool,
    may_have_b_frames: bool,
    mv_data:    Vec<BlockMVInfo>,
}

#[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_with_opts(is_gob: bool, may_have_b_frames: bool) -> Self {
        H263BaseDecoder{
            w: 0, h: 0, mb_w: 0, mb_h: 0, num_mb: 0,
            ftype: Type::Special,
            ipbs: IPBShuffler::new(),
            last_ts: 0, next_ts: 0, tsdiff: 0,
            has_b: false, b_data: Vec::new(),
            pred_coeffs: Vec::new(),
            is_gob: is_gob,
            may_have_b_frames: may_have_b_frames,
            mv_data: Vec::new(),
        }
    }
    pub fn new(is_gob: bool) -> Self {
        Self::new_with_opts(is_gob, false)
    }
    pub fn new_b_frames(is_gob: bool) -> Self {
        Self::new_with_opts(is_gob, true)
    }

    pub fn is_intra(&self) -> bool { self.ftype == Type::I }
    pub fn get_frame_type(&self) -> FrameType {
        match self.ftype {
            Type::I       => FrameType::I,
            Type::P       => FrameType::P,
            Type::B       => FrameType::B,
            Type::PB      => FrameType::P,
            Type::Skip    => FrameType::Skip,
            Type::Special => FrameType::Skip,
        }
    }
    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 mvi2 = 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.mv_data.truncate(0);
        }

        let save_b_data = pinfo.mode.is_ref() && self.may_have_b_frames;
        if save_b_data {
            self.mv_data.truncate(0);
        }
        let is_b = pinfo.mode == Type::B;

        let tsdiff = if pinfo.is_pb() { pinfo.ts.wrapping_sub(self.last_ts) >> 1 }
                     else { self.last_ts.wrapping_sub(self.next_ts) >> 1 };
        let bsdiff = if pinfo.is_pb() { (pinfo.get_pbinfo().get_trb() as u16) << 7 }
                     else { pinfo.ts.wrapping_sub(self.next_ts) >> 1 };

        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());
        if is_b || pinfo.is_pb() {
            mvi2.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)?;
                    if !self.is_gob {
                        mvi.reset(self.mb_w, mb_x, pinfo.get_mvmode());
                        if is_b || pinfo.is_pb() {
                            mvi2.reset(self.mb_w, mb_x, pinfo.get_mvmode());
                        }
                        cbpi.reset(self.mb_w);
                        sstate.reset_slice(mb_x, mb_y);
                    }
                }

                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() {
                    if save_b_data {
                        self.mv_data.push(BlockMVInfo::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) || !sstate.first_mb;
                            let has_a = (i == 2) || (i == 3) || !sstate.first_line;
                            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]; }
                        }
                        bdsp.idct(&mut blk[i]);
                    }
                    blockdsp::put_blocks(&mut buf, mb_x, mb_y, &blk);
                    mvi.set_zero_mv(mb_x);
                    if is_b {
                        mvi2.set_zero_mv(mb_x);
                    } else if pinfo.is_pb() {
                        mvi2.predict(mb_x, 0, false, binfo.get_mv2(0), sstate.first_line, sstate.first_mb);
                    }
                } else if (binfo.mode != Type::B) && !binfo.is_skipped() {
                    if binfo.get_num_mvs() == 1 {
                        let mv = mvi.predict(mb_x, 0, false, binfo.get_mv(0), sstate.first_line, sstate.first_mb);
                        if save_b_data {
                            self.mv_data.push(BlockMVInfo::Inter_1MV(mv));
                        }
                        if let Some(ref srcbuf) = self.ipbs.get_lastref() {
                            bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, mv);
                        }
                        if pinfo.is_pb() {
                            mvi2.predict(mb_x, 0, false, binfo.get_mv(0), sstate.first_line, sstate.first_mb);
                        }
                    } else {
                        let mut mv: [MV; 4] = [ZERO_MV, ZERO_MV, ZERO_MV, ZERO_MV];
                        for blk_no in 0..4 {
                            mv[blk_no] = mvi.predict(mb_x, blk_no, true, binfo.get_mv(blk_no), sstate.first_line, sstate.first_mb);
                            if let Some(ref srcbuf) = self.ipbs.get_lastref() {
                                bdsp.copy_blocks(&mut buf, srcbuf,
                                                 mb_x * 16 + (blk_no & 1) * 8,
                                                 mb_y * 16 + (blk_no & 2) * 4, 8, 8, mv[blk_no]);
                            }
                        }
                        if pinfo.is_pb() {
                            for blk_no in 0..4 {
                                mvi2.predict(mb_x, blk_no, true, binfo.get_mv(blk_no), sstate.first_line, sstate.first_mb);
                            }
                        }
                        if save_b_data {
                            self.mv_data.push(BlockMVInfo::Inter_4MV(mv));
                        }
                    }
                    for i in 0..6 {
                        bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
                        bdsp.idct(&mut blk[i]);
                    }
                    blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
                    if is_b && !pinfo.is_pb() {
                        mvi2.set_zero_mv(mb_x);
                    }
                } else if binfo.mode != Type::B {
                    self.mv_data.push(BlockMVInfo::Inter_1MV(ZERO_MV));
                    mvi.set_zero_mv(mb_x);
                    if is_b || pinfo.is_pb() {
                        mvi2.set_zero_mv(mb_x);
                    }
                    if let Some(ref srcbuf) = self.ipbs.get_lastref() {
                        bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, ZERO_MV);
                    }
                } else {
                    let ref_mv_info = self.mv_data[mb_pos];
                    let has_fwd = binfo.get_num_mvs() > 0;
                    let has_bwd = binfo.get_num_mvs2() > 0;
//todo refactor
                    if has_fwd || has_bwd {
                        let fwd_mv;
                        if has_fwd {
                            fwd_mv = mvi.predict(mb_x, 0, false, binfo.get_mv(0), sstate.first_line, sstate.first_mb);
                        } else {
                            fwd_mv = ZERO_MV;
                            mvi.set_zero_mv(mb_x);
                        }
                        let bwd_mv;
                        if has_bwd {
                            bwd_mv = mvi2.predict(mb_x, 0, false, binfo.get_mv2(0), sstate.first_line, sstate.first_mb);
                        } else {
                            bwd_mv = ZERO_MV;
                            mvi2.set_zero_mv(mb_x);
                        }
                        if let (Some(ref fwd_buf), Some(ref bck_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
                            if has_fwd && has_bwd {
                                bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, fwd_mv);
                                bdsp.avg_blocks (&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, bwd_mv);
                            } else if has_fwd {
                                bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, fwd_mv);
                            } else {
                                bdsp.copy_blocks(&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, bwd_mv);
                            }
                        }
                    } else {
                        if let BlockMVInfo::Inter_4MV(mvs) = ref_mv_info {
                            for blk_no in 0..4 {
                                let ref_mv = mvs[blk_no];
                                let ref_mv_fwd = ref_mv.scale(bsdiff, tsdiff);
                                let ref_mv_bwd = ref_mv - ref_mv_fwd;
                                let xoff = mb_x * 16 + (blk_no & 1) * 8;
                                let yoff = mb_y * 16 + (blk_no & 2) * 4;
                                if let (Some(ref fwd_buf), Some(ref bck_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
                                    bdsp.copy_blocks(&mut buf, fwd_buf, xoff, yoff, 8, 8, ref_mv_fwd);
                                    bdsp.avg_blocks (&mut buf, bck_buf, xoff, yoff, 8, 8, ref_mv_bwd);
                                }
                            }
                        } else {
                            let ref_mv = if let BlockMVInfo::Inter_1MV(mv_) = ref_mv_info { mv_ } else { ZERO_MV };
                            let ref_mv_fwd = ref_mv.scale(bsdiff, tsdiff);
                            let ref_mv_bwd = MV::b_sub(ref_mv, ref_mv_fwd, ZERO_MV, bsdiff, tsdiff);

                            if let (Some(ref fwd_buf), Some(ref bck_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
                                bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_fwd);
                                bdsp.avg_blocks (&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_bwd);
                            }
                        }
                        mvi.set_zero_mv(mb_x);
                        mvi2.set_zero_mv(mb_x);
                    }
                    if cbp != 0 {
                        for i in 0..6 {
                            bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
                            bdsp.idct(&mut blk[i]);
                        }
                        blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
                    }
                }
                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])?;
                        bdsp.idct(&mut b_mb.blk[i]);
                    }

                    let is_fwd = binfo.is_b_fwd();
                    b_mb.fwd = is_fwd;
                    if binfo.get_num_mvs() != 4 {
                        let ref_mv = mvi2.get_mv(mb_x, 0);
                        let b_mv = if binfo.is_intra() { binfo.get_mv2(1) } else { binfo.get_mv2(0) };
                        let src_mv = if is_fwd { ZERO_MV } else { ref_mv.scale(bsdiff, tsdiff) };
                        let mv_f = MV::add_umv(src_mv, b_mv, pinfo.get_mvmode());
                        let mv_b = MV::b_sub(ref_mv, mv_f, b_mv, bsdiff, tsdiff);
                        b_mb.mv_f[0] = mv_f;
                        b_mb.mv_b[0] = mv_b;
                        b_mb.num_mv = 1;
                    } else {
                        for blk_no in 0..4 {
                            let src_mv = if is_fwd { ZERO_MV } else { mvi2.get_mv(mb_x, 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(mvi2.get_mv(mb_x, 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;
                        }
                        b_mb.num_mv = 4;
                    }
                    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();
            if is_b || pinfo.is_pb() {
                mvi2.update_row();
            }
            cbpi.update_row();
            sstate.new_row();
        }

        if pinfo.mode.is_ref() {
            self.ipbs.add_frame(buf);
            self.next_ts = self.last_ts;
            self.last_ts = pinfo.ts;
            self.tsdiff  = tsdiff;
        }

        Ok(bufinfo)
    }

    pub fn get_bframe(&mut self, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
        if !self.has_b || !self.ipbs.get_lastref().is_some() || !self.ipbs.get_nextref().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), Some(ref fwd_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
            recon_b_frame(&mut b_buf, fwd_buf, bck_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
32007ad9	1	//use std::mem;
88c58b1b KS	2	use frame::*;
	3	use super::super::*;
	4	use super::super::blockdsp;
cf64af13	5	use super::*;
7b6e074c	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;
cf64af13	25	self.mv.resize(self.mb_stride * 3, ZERO_MV);
2324f30b	26	self.mvmode = mvmode;
cf64af13 KS	27	}
	28	fn update_row(&mut self) {
	29	self.mb_start = self.mb_w + 1;
	30	self.top = false;
	31	for i in 0..self.mb_stride {
	32	self.mv[i] = self.mv[self.mb_stride * 2 + i];
	33	}
	34	}
	35	#[allow(non_snake_case)]
32007ad9	36	fn predict(&mut self, mb_x: usize, blk_no: usize, use4: bool, diff: MV, first_line: bool, first_mb: bool) -> MV {
cf64af13 KS	37	let A;
	38	let B;
	39	let C;
	40	let last = mb_x == self.mb_w - 1;
cf64af13 KS	41	match blk_no {
	42	0 => {
	43	if mb_x != self.mb_start {
32007ad9 KS	44	A = if !first_mb { self.mv[self.mb_stride + mb_x * 2 - 1] } else { ZERO_MV };
	45	B = if !first_line { self.mv[ mb_x * 2] } else { A };
	46	C = if !first_line && !last { self.mv[mb_x * 2 + 2] } else { ZERO_MV };
cf64af13 KS	47	} else {
	48	A = ZERO_MV; B = ZERO_MV; C = ZERO_MV;
	49	}
	50	},
	51	1 => {
	52	A = self.mv[self.mb_stride + mb_x * 2];
32007ad9	53	B = if !first_line { self.mv[mb_x * 2 + 1] } else { A };
effbebce	54	C = if !first_line && !last { self.mv[mb_x * 2 + 2] } else { ZERO_MV/A/ };
cf64af13 KS	55	},
	56	2 => {
	57	A = if mb_x != self.mb_start { self.mv[self.mb_stride * 2 + mb_x * 2 - 1] } else { ZERO_MV };
	58	B = self.mv[self.mb_stride + mb_x * 2];
	59	C = self.mv[self.mb_stride + mb_x * 2 + 1];
	60	},
	61	3 => {
	62	A = self.mv[self.mb_stride * 2 + mb_x * 2];
	63	B = self.mv[self.mb_stride * 1 + mb_x * 2 + 1];
	64	C = self.mv[self.mb_stride * 1 + mb_x * 2];
	65	},
	66	_ => { return ZERO_MV; }
	67	}
cf64af13	68	let pred_mv = MV::pred(A, B, C);
2324f30b	69	let new_mv = MV::add_umv(pred_mv, diff, self.mvmode);
cf64af13 KS	70	if !use4 {
	71	self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = new_mv;
	72	self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = new_mv;
	73	self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = new_mv;
	74	self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = new_mv;
	75	} else {
	76	match blk_no {
	77	0 => { self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = new_mv; },
	78	1 => { self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = new_mv; },
	79	2 => { self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = new_mv; },
	80	3 => { self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = new_mv; },
	81	_ => {},
	82	};
	83	}
	84
	85	new_mv
	86	}
	87	fn set_zero_mv(&mut self, mb_x: usize) {
	88	self.mv[self.mb_stride * 1 + mb_x * 2 + 0] = ZERO_MV;
	89	self.mv[self.mb_stride * 1 + mb_x * 2 + 1] = ZERO_MV;
	90	self.mv[self.mb_stride * 2 + mb_x * 2 + 0] = ZERO_MV;
	91	self.mv[self.mb_stride * 2 + mb_x * 2 + 1] = ZERO_MV;
	92	}
effbebce KS	93	fn get_mv(&self, mb_x: usize, blk_no: usize) -> MV {
	94	self.mv[self.mb_stride + mb_x * 2 + (blk_no & 1) + (blk_no >> 1) * self.mb_stride]
	95	}
cf64af13 KS	96	}
cf64af13 KS	97
21c16d5f KS	98	#[allow(dead_code)]
	99	#[derive(Clone,Copy)]
	100	struct BMB {
	101	num_mv: usize,
	102	mv_f: [MV; 4],
	103	mv_b: [MV; 4],
	104	fwd: bool,
	105	blk: [[i16; 64]; 6],
	106	cbp: u8,
	107	}
	108
	109	impl BMB {
	110	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} }
	111	}
	112
ef3209c7 KS	113	#[derive(Clone,Copy)]
	114	struct PredCoeffs {
	115	hor: [[i16; 8]; 6],
	116	ver: [[i16; 8]; 6],
	117	}
	118
	119	const ZERO_PRED_COEFFS: PredCoeffs = PredCoeffs { hor: [[0; 8]; 6], ver: [[0; 8]; 6] };
	120
88c58b1b	121	pub struct H263BaseDecoder {
cf64af13 KS	122	w: usize,
	123	h: usize,
	124	mb_w: usize,
	125	mb_h: usize,
	126	num_mb: usize,
	127	ftype: Type,
32007ad9 KS	128	ipbs: IPBShuffler,
	129	next_ts: u16,
	130	last_ts: u16,
	131	tsdiff: u16,
21c16d5f KS	132	has_b: bool,
21c16d5f KS	133	b_data: Vec<BMB>,
ef3209c7	134	pred_coeffs: Vec<PredCoeffs>,
42a59352	135	is_gob: bool,
32007ad9 KS	136	may_have_b_frames: bool,
32007ad9 KS	137	mv_data: Vec<BlockMVInfo>,
ef3209c7 KS	138	}
	139
	140	#[inline]
	141	fn clip_dc(dc: i16) -> i16 {
	142	if dc < 0 { 0 }
	143	else if dc > 2046 { 2046 }
	144	else { (dc + 1) & !1 }
	145	}
	146
	147	#[inline]
	148	fn clip_ac(ac: i16) -> i16 {
	149	if ac < -2048 { -2048 }
	150	else if ac > 2047 { 2047 }
	151	else { ac }
cf64af13 KS	152	}
	153
	154	#[allow(dead_code)]
88c58b1b	155	impl H263BaseDecoder {
32007ad9	156	pub fn new_with_opts(is_gob: bool, may_have_b_frames: bool) -> Self {
88c58b1b	157	H263BaseDecoder{
cf64af13 KS	158	w: 0, h: 0, mb_w: 0, mb_h: 0, num_mb: 0,
cf64af13 KS	159	ftype: Type::Special,
32007ad9 KS	160	ipbs: IPBShuffler::new(),
32007ad9 KS	161	last_ts: 0, next_ts: 0, tsdiff: 0,
21c16d5f	162	has_b: false, b_data: Vec::new(),
ef3209c7	163	pred_coeffs: Vec::new(),
42a59352	164	is_gob: is_gob,
32007ad9 KS	165	may_have_b_frames: may_have_b_frames,
32007ad9 KS	166	mv_data: Vec::new(),
cf64af13 KS	167	}
cf64af13 KS	168	}
32007ad9 KS	169	pub fn new(is_gob: bool) -> Self {
	170	Self::new_with_opts(is_gob, false)
	171	}
	172	pub fn new_b_frames(is_gob: bool) -> Self {
	173	Self::new_with_opts(is_gob, true)
	174	}
cf64af13 KS	175
cf64af13 KS	176	pub fn is_intra(&self) -> bool { self.ftype == Type::I }
2eb21477 KS	177	pub fn get_frame_type(&self) -> FrameType {
	178	match self.ftype {
	179	Type::I => FrameType::I,
	180	Type::P => FrameType::P,
	181	Type::B => FrameType::B,
	182	Type::PB => FrameType::P,
	183	Type::Skip => FrameType::Skip,
	184	Type::Special => FrameType::Skip,
	185	}
	186	}
cf64af13 KS	187	pub fn get_dimensions(&self) -> (usize, usize) { (self.w, self.h) }
cf64af13 KS	188
2a2aa421	189	pub fn parse_frame(&mut self, bd: &mut BlockDecoder, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
cf64af13	190	let pinfo = bd.decode_pichdr()?;
21c16d5f	191	let mut mvi = MVInfo::new();
15facd16	192	let mut mvi2 = MVInfo::new();
f2f1afb2	193	let mut cbpi = CBPInfo::new();
cf64af13 KS	194
	195	//todo handle res change
	196	self.w = pinfo.w;
	197	self.h = pinfo.h;
	198	self.mb_w = (pinfo.w + 15) >> 4;
	199	self.mb_h = (pinfo.h + 15) >> 4;
	200	self.num_mb = self.mb_w * self.mb_h;
	201	self.ftype = pinfo.mode;
21c16d5f KS	202	self.has_b = pinfo.is_pb();
	203
	204	if self.has_b {
32007ad9	205	self.mv_data.truncate(0);
21c16d5f	206	}
cf64af13	207
32007ad9 KS	208	let save_b_data = pinfo.mode.is_ref() && self.may_have_b_frames;
	209	if save_b_data {
	210	self.mv_data.truncate(0);
	211	}
15facd16	212	let is_b = pinfo.mode == Type::B;
cf64af13	213
88e9abd4 KS	214	let tsdiff = if pinfo.is_pb() { pinfo.ts.wrapping_sub(self.last_ts) >> 1 }
88e9abd4 KS	215	else { self.last_ts.wrapping_sub(self.next_ts) >> 1 };
32007ad9 KS	216	let bsdiff = if pinfo.is_pb() { (pinfo.get_pbinfo().get_trb() as u16) << 7 }
32007ad9 KS	217	else { pinfo.ts.wrapping_sub(self.next_ts) >> 1 };
21c16d5f	218
cf64af13 KS	219	let fmt = formats::YUV420_FORMAT;
	220	let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
	221	let bufret = alloc_video_buffer(vinfo, 4);
	222	if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
	223	let mut bufinfo = bufret.unwrap();
	224	let mut buf = bufinfo.get_vbuf().unwrap();
	225
42a59352	226	let mut slice = if self.is_gob {
2a2aa421 KS	227	SliceInfo::get_default_slice(&pinfo)
	228	} else {
	229	bd.decode_slice_header(&pinfo)?
	230	};
2324f30b	231	mvi.reset(self.mb_w, 0, pinfo.get_mvmode());
effbebce	232	if is_b \|\| pinfo.is_pb() {
15facd16 KS	233	mvi2.reset(self.mb_w, 0, pinfo.get_mvmode());
15facd16 KS	234	}
f2f1afb2	235	cbpi.reset(self.mb_w);
cf64af13 KS	236
cf64af13 KS	237	let mut blk: [[i16; 64]; 6] = [[0; 64]; 6];
2a2aa421 KS	238	let mut sstate = SliceState::new(pinfo.mode == Type::I);
2a2aa421 KS	239	let mut mb_pos = 0;
ef3209c7 KS	240	let apply_acpred = (pinfo.mode == Type::I) && pinfo.plusinfo.is_some() && pinfo.plusinfo.unwrap().aic;
	241	if apply_acpred {
	242	self.pred_coeffs.truncate(0);
	243	self.pred_coeffs.resize(self.mb_w * self.mb_h, ZERO_PRED_COEFFS);
	244	}
cf64af13 KS	245	for mb_y in 0..self.mb_h {
	246	for mb_x in 0..self.mb_w {
	247	for i in 0..6 { for j in 0..64 { blk[i][j] = 0; } }
	248
2a2aa421	249	if slice.is_at_end(mb_pos) \|\| (slice.needs_check() && mb_pos > 0 && bd.is_slice_end()) {
cf64af13	250	slice = bd.decode_slice_header(&pinfo)?;
6f21f5f4 KS	251	if !self.is_gob {
6f21f5f4 KS	252	mvi.reset(self.mb_w, mb_x, pinfo.get_mvmode());
effbebce	253	if is_b \|\| pinfo.is_pb() {
15facd16 KS	254	mvi2.reset(self.mb_w, mb_x, pinfo.get_mvmode());
15facd16 KS	255	}
6f21f5f4	256	cbpi.reset(self.mb_w);
32007ad9	257	sstate.reset_slice(mb_x, mb_y);
6f21f5f4	258	}
cf64af13 KS	259	}
cf64af13 KS	260
2a2aa421	261	let binfo = bd.decode_block_header(&pinfo, &slice, &sstate)?;
cf64af13	262	let cbp = binfo.get_cbp();
f2f1afb2 KS	263	cbpi.set_cbp(mb_x, cbp);
f2f1afb2 KS	264	cbpi.set_q(mb_x, binfo.get_q());
cf64af13	265	if binfo.is_intra() {
32007ad9 KS	266	if save_b_data {
	267	self.mv_data.push(BlockMVInfo::Intra);
	268	}
cf64af13	269	for i in 0..6 {
2a2aa421	270	bd.decode_block_intra(&binfo, &sstate, binfo.get_q(), i, (cbp & (1 << (5 - i))) != 0, &mut blk[i])?;
ef3209c7	271	if apply_acpred && (binfo.acpred != ACPredMode::None) {
2eb21477	272	let has_b = (i == 1) \|\| (i == 3) \|\| !sstate.first_mb;
6f21f5f4	273	let has_a = (i == 2) \|\| (i == 3) \|\| !sstate.first_line;
ef3209c7 KS	274	let (b_mb, b_blk) = if has_b {
	275	if (i == 1) \|\| (i == 3) {
	276	(mb_pos, i - 1)
	277	} else if i < 4 {
	278	(mb_pos - 1, i + 1)
	279	} else {
	280	(mb_pos - 1, i)
	281	}
	282	} else { (0, 0) };
	283	let (a_mb, a_blk) = if has_a {
	284	if (i == 2) \|\| (i == 3) {
	285	(mb_pos, i - 2)
	286	} else if i < 4 {
	287	(mb_pos - self.mb_w, i + 2)
	288	} else {
	289	(mb_pos - self.mb_w, i)
	290	}
	291	} else { (0, 0) };
	292	match binfo.acpred {
	293	ACPredMode::DC => {
	294	let dc;
	295	if has_a && has_b {
	296	dc = (self.pred_coeffs[b_mb].hor[b_blk][0] + self.pred_coeffs[a_mb].ver[a_blk][0]) / 2;
	297	} else if has_a {
	298	dc = self.pred_coeffs[a_mb].ver[a_blk][0];
	299	} else if has_b {
	300	dc = self.pred_coeffs[b_mb].hor[b_blk][0];
	301	} else {
	302	dc = 1024;
	303	}
	304	blk[i][0] = clip_dc(blk[i][0] + dc);
	305	},
	306	ACPredMode::Hor => {
	307	if has_b {
	308	for k in 0..8 {
	309	blk[i][k * 8] += self.pred_coeffs[b_mb].hor[b_blk][k];
	310	}
	311	for k in 1..8 {
	312	blk[i][k * 8] = clip_ac(blk[i][k * 8]);
	313	}
	314	} else {
	315	blk[i][0] += 1024;
	316	}
	317	blk[i][0] = clip_dc(blk[i][0]);
	318	},
	319	ACPredMode::Ver => {
	320	if has_a {
	321	for k in 0..8 {
	322	blk[i][k] += self.pred_coeffs[a_mb].ver[a_blk][k];
	323	}
	324	for k in 1..8 {
	325	blk[i][k] = clip_ac(blk[i][k]);
	326	}
	327	} else {
	328	blk[i][0] += 1024;
	329	}
	330	blk[i][0] = clip_dc(blk[i][0]);
	331	},
	332	ACPredMode::None => {},
	333	};
	334	for t in 0..8 { self.pred_coeffs[mb_pos].hor[i][t] = blk[i][t * 8]; }
	335	for t in 0..8 { self.pred_coeffs[mb_pos].ver[i][t] = blk[i][t]; }
	336	}
7b6e074c	337	bdsp.idct(&mut blk[i]);
cf64af13 KS	338	}
	339	blockdsp::put_blocks(&mut buf, mb_x, mb_y, &blk);
	340	mvi.set_zero_mv(mb_x);
15facd16 KS	341	if is_b {
15facd16 KS	342	mvi2.set_zero_mv(mb_x);
effbebce KS	343	} else if pinfo.is_pb() {
effbebce KS	344	mvi2.predict(mb_x, 0, false, binfo.get_mv2(0), sstate.first_line, sstate.first_mb);
15facd16	345	}
2eb21477	346	} else if (binfo.mode != Type::B) && !binfo.is_skipped() {
cf64af13	347	if binfo.get_num_mvs() == 1 {
32007ad9 KS	348	let mv = mvi.predict(mb_x, 0, false, binfo.get_mv(0), sstate.first_line, sstate.first_mb);
	349	if save_b_data {
	350	self.mv_data.push(BlockMVInfo::Inter_1MV(mv));
	351	}
	352	if let Some(ref srcbuf) = self.ipbs.get_lastref() {
2a2aa421	353	bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, mv);
cf64af13	354	}
effbebce KS	355	if pinfo.is_pb() {
	356	mvi2.predict(mb_x, 0, false, binfo.get_mv(0), sstate.first_line, sstate.first_mb);
	357	}
cf64af13	358	} else {
32007ad9	359	let mut mv: [MV; 4] = [ZERO_MV, ZERO_MV, ZERO_MV, ZERO_MV];
cf64af13	360	for blk_no in 0..4 {
32007ad9 KS	361	mv[blk_no] = mvi.predict(mb_x, blk_no, true, binfo.get_mv(blk_no), sstate.first_line, sstate.first_mb);
32007ad9 KS	362	if let Some(ref srcbuf) = self.ipbs.get_lastref() {
2a2aa421 KS	363	bdsp.copy_blocks(&mut buf, srcbuf,
2a2aa421 KS	364	mb_x * 16 + (blk_no & 1) * 8,
32007ad9	365	mb_y * 16 + (blk_no & 2) * 4, 8, 8, mv[blk_no]);
cf64af13 KS	366	}
cf64af13 KS	367	}
effbebce KS	368	if pinfo.is_pb() {
	369	for blk_no in 0..4 {
	370	mvi2.predict(mb_x, blk_no, true, binfo.get_mv(blk_no), sstate.first_line, sstate.first_mb);
	371	}
	372	}
32007ad9 KS	373	if save_b_data {
	374	self.mv_data.push(BlockMVInfo::Inter_4MV(mv));
	375	}
cf64af13 KS	376	}
cf64af13 KS	377	for i in 0..6 {
2a2aa421	378	bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
7b6e074c	379	bdsp.idct(&mut blk[i]);
cf64af13 KS	380	}
cf64af13 KS	381	blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
effbebce	382	if is_b && !pinfo.is_pb() {
d609e5d5 KS	383	mvi2.set_zero_mv(mb_x);
d609e5d5 KS	384	}
2eb21477	385	} else if binfo.mode != Type::B {
32007ad9	386	self.mv_data.push(BlockMVInfo::Inter_1MV(ZERO_MV));
cf64af13	387	mvi.set_zero_mv(mb_x);
effbebce	388	if is_b \|\| pinfo.is_pb() {
d609e5d5 KS	389	mvi2.set_zero_mv(mb_x);
d609e5d5 KS	390	}
32007ad9	391	if let Some(ref srcbuf) = self.ipbs.get_lastref() {
2a2aa421	392	bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, ZERO_MV);
cf64af13	393	}
2eb21477	394	} else {
32007ad9 KS	395	let ref_mv_info = self.mv_data[mb_pos];
	396	let has_fwd = binfo.get_num_mvs() > 0;
	397	let has_bwd = binfo.get_num_mvs2() > 0;
32007ad9	398	//todo refactor
15facd16 KS	399	if has_fwd \|\| has_bwd {
	400	let fwd_mv;
	401	if has_fwd {
	402	fwd_mv = mvi.predict(mb_x, 0, false, binfo.get_mv(0), sstate.first_line, sstate.first_mb);
	403	} else {
	404	fwd_mv = ZERO_MV;
	405	mvi.set_zero_mv(mb_x);
	406	}
	407	let bwd_mv;
	408	if has_bwd {
	409	bwd_mv = mvi2.predict(mb_x, 0, false, binfo.get_mv2(0), sstate.first_line, sstate.first_mb);
	410	} else {
	411	bwd_mv = ZERO_MV;
	412	mvi2.set_zero_mv(mb_x);
	413	}
	414	if let (Some(ref fwd_buf), Some(ref bck_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
	415	if has_fwd && has_bwd {
	416	bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, fwd_mv);
	417	bdsp.avg_blocks (&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, bwd_mv);
	418	} else if has_fwd {
	419	bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, fwd_mv);
	420	} else {
	421	bdsp.copy_blocks(&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, bwd_mv);
32007ad9 KS	422	}
	423	}
	424	} else {
15facd16 KS	425	if let BlockMVInfo::Inter_4MV(mvs) = ref_mv_info {
	426	for blk_no in 0..4 {
	427	let ref_mv = mvs[blk_no];
	428	let ref_mv_fwd = ref_mv.scale(bsdiff, tsdiff);
	429	let ref_mv_bwd = ref_mv - ref_mv_fwd;
	430	let xoff = mb_x * 16 + (blk_no & 1) * 8;
	431	let yoff = mb_y * 16 + (blk_no & 2) * 4;
	432	if let (Some(ref fwd_buf), Some(ref bck_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
	433	bdsp.copy_blocks(&mut buf, fwd_buf, xoff, yoff, 8, 8, ref_mv_fwd);
	434	bdsp.avg_blocks (&mut buf, bck_buf, xoff, yoff, 8, 8, ref_mv_bwd);
	435	}
	436	}
	437	} else {
	438	let ref_mv = if let BlockMVInfo::Inter_1MV(mv_) = ref_mv_info { mv_ } else { ZERO_MV };
	439	let ref_mv_fwd = ref_mv.scale(bsdiff, tsdiff);
	440	let ref_mv_bwd = MV::b_sub(ref_mv, ref_mv_fwd, ZERO_MV, bsdiff, tsdiff);
	441
	442	if let (Some(ref fwd_buf), Some(ref bck_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
32007ad9	443	bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_fwd);
15facd16	444	bdsp.avg_blocks (&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_bwd);
32007ad9 KS	445	}
32007ad9 KS	446	}
15facd16 KS	447	mvi.set_zero_mv(mb_x);
15facd16 KS	448	mvi2.set_zero_mv(mb_x);
32007ad9	449	}
2eb21477 KS	450	if cbp != 0 {
	451	for i in 0..6 {
	452	bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
7b6e074c	453	bdsp.idct(&mut blk[i]);
2eb21477	454	}
32007ad9	455	blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
2eb21477	456	}
cf64af13	457	}
21c16d5f KS	458	if pinfo.is_pb() {
21c16d5f KS	459	let mut b_mb = BMB::new();
cf64af13	460	let cbp = binfo.get_cbp_b();
21c16d5f KS	461	let bq = (((pinfo.get_pbinfo().get_dbquant() + 5) as u16) * (binfo.get_q() as u16)) >> 2;
	462	let bquant;
	463	if bq < 1 { bquant = 1; }
	464	else if bq > 31 { bquant = 31; }
	465	else { bquant = bq as u8; }
	466
	467	b_mb.cbp = cbp;
cf64af13	468	for i in 0..6 {
2a2aa421	469	bd.decode_block_inter(&binfo, &sstate, bquant, i, (cbp & (1 << (5 - i))) != 0, &mut b_mb.blk[i])?;
7b6e074c	470	bdsp.idct(&mut b_mb.blk[i]);
cf64af13	471	}
21c16d5f	472
effbebce	473	let is_fwd = binfo.is_b_fwd();
21c16d5f	474	b_mb.fwd = is_fwd;
effbebce KS	475	if binfo.get_num_mvs() != 4 {
	476	let ref_mv = mvi2.get_mv(mb_x, 0);
	477	let b_mv = if binfo.is_intra() { binfo.get_mv2(1) } else { binfo.get_mv2(0) };
	478	let src_mv = if is_fwd { ZERO_MV } else { ref_mv.scale(bsdiff, tsdiff) };
	479	let mv_f = MV::add_umv(src_mv, b_mv, pinfo.get_mvmode());
	480	let mv_b = MV::b_sub(ref_mv, mv_f, b_mv, bsdiff, tsdiff);
21c16d5f KS	481	b_mb.mv_f[0] = mv_f;
21c16d5f KS	482	b_mb.mv_b[0] = mv_b;
effbebce	483	b_mb.num_mv = 1;
21c16d5f KS	484	} else {
21c16d5f KS	485	for blk_no in 0..4 {
effbebce	486	let src_mv = if is_fwd { ZERO_MV } else { mvi2.get_mv(mb_x, blk_no).scale(bsdiff, tsdiff) };
2324f30b	487	let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
effbebce	488	let mv_b = MV::b_sub(mvi2.get_mv(mb_x, blk_no), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
21c16d5f KS	489	b_mb.mv_f[blk_no] = mv_f;
21c16d5f KS	490	b_mb.mv_b[blk_no] = mv_b;
cf64af13	491	}
effbebce	492	b_mb.num_mv = 4;
cf64af13	493	}
21c16d5f	494	self.b_data.push(b_mb);
cf64af13	495	}
2a2aa421 KS	496	sstate.next_mb();
2a2aa421 KS	497	mb_pos += 1;
cf64af13	498	}
2a2aa421 KS	499	if let Some(plusinfo) = pinfo.plusinfo {
	500	if plusinfo.deblock {
	501	bdsp.filter_row(&mut buf, mb_y, self.mb_w, &cbpi);
	502	}
f2f1afb2	503	}
cf64af13	504	mvi.update_row();
effbebce	505	if is_b \|\| pinfo.is_pb() {
d609e5d5 KS	506	mvi2.update_row();
d609e5d5 KS	507	}
f2f1afb2	508	cbpi.update_row();
2a2aa421	509	sstate.new_row();
cf64af13	510	}
32007ad9 KS	511
	512	if pinfo.mode.is_ref() {
	513	self.ipbs.add_frame(buf);
	514	self.next_ts = self.last_ts;
	515	self.last_ts = pinfo.ts;
	516	self.tsdiff = tsdiff;
	517	}
	518
cf64af13 KS	519	Ok(bufinfo)
	520	}
	521
2a2aa421	522	pub fn get_bframe(&mut self, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
32007ad9	523	if !self.has_b \|\| !self.ipbs.get_lastref().is_some() \|\| !self.ipbs.get_nextref().is_some() {
21c16d5f KS	524	return Err(DecoderError::MissingReference);
	525	}
	526	self.has_b = false;
	527
	528	let fmt = formats::YUV420_FORMAT;
	529	let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
	530	let bufret = alloc_video_buffer(vinfo, 4);
	531	if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
	532	let mut bufinfo = bufret.unwrap();
	533	let mut b_buf = bufinfo.get_vbuf().unwrap();
	534
32007ad9	535	if let (Some(ref bck_buf), Some(ref fwd_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
effbebce	536	recon_b_frame(&mut b_buf, fwd_buf, bck_buf, self.mb_w, self.mb_h, &self.b_data, bdsp);
21c16d5f KS	537	}
	538
	539	self.b_data.truncate(0);
	540	Ok(bufinfo)
	541	}
	542	}
	543
	544	fn recon_b_frame(b_buf: &mut NAVideoBuffer<u8>, bck_buf: &NAVideoBuffer<u8>, fwd_buf: &NAVideoBuffer<u8>,
2a2aa421	545	mb_w: usize, mb_h: usize, b_data: &Vec<BMB>, bdsp: &BlockDSP) {
f2f1afb2	546	let mut cbpi = CBPInfo::new();
21c16d5f	547	let mut cur_mb = 0;
f2f1afb2	548	cbpi.reset(mb_w);
21c16d5f KS	549	for mb_y in 0..mb_h {
	550	for mb_x in 0..mb_w {
	551	let num_mv = b_data[cur_mb].num_mv;
	552	let is_fwd = b_data[cur_mb].fwd;
f2f1afb2 KS	553	let cbp = b_data[cur_mb].cbp;
	554	cbpi.set_cbp(mb_x, cbp);
	555	if num_mv == 1 {
2a2aa421	556	bdsp.copy_blocks(b_buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_b[0]);
21c16d5f	557	if !is_fwd {
2a2aa421	558	bdsp.avg_blocks(b_buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_f[0]);
21c16d5f KS	559	}
	560	} else {
	561	for blk_no in 0..4 {
	562	let xpos = mb_x * 16 + (blk_no & 1) * 8;
	563	let ypos = mb_y * 16 + (blk_no & 2) * 4;
2a2aa421	564	bdsp.copy_blocks(b_buf, fwd_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_b[blk_no]);
21c16d5f	565	if !is_fwd {
2a2aa421	566	bdsp.avg_blocks(b_buf, bck_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_f[blk_no]);
21c16d5f KS	567	}
	568	}
	569	}
f2f1afb2	570	if cbp != 0 {
21c16d5f KS	571	blockdsp::add_blocks(b_buf, mb_x, mb_y, &b_data[cur_mb].blk);
	572	}
	573	cur_mb += 1;
cf64af13	574	}
f2f1afb2	575	cbpi.update_row();
cf64af13 KS	576	}
cf64af13 KS	577	}