[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 { 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,
    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 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 tsdiff = pinfo.ts.wrapping_sub(self.last_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());
        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());
                        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]; }
                        }
                        h263_idct(&mut blk[i]);
                    }
                    blockdsp::put_blocks(&mut buf, mb_x, mb_y, &blk);
                    mvi.set_zero_mv(mb_x);
                } 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);
                        }
                    } 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 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])?;
                        h263_idct(&mut blk[i]);
                    }
                    blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
                } else if binfo.mode != Type::B {
                    self.mv_data.push(BlockMVInfo::Inter_1MV(ZERO_MV));
                    mvi.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;
                    let is_direct = has_fwd && has_bwd;
//todo refactor
                    if let BlockMVInfo::Inter_4MV(mvs) = ref_mv_info {
                        for blk_no in 0..4 {
                            let ref_mv = mvs[blk_no];
                            let mut ref_mv_fwd = ref_mv.scale(bsdiff, tsdiff);
                            let mut 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 has_fwd { ref_mv_fwd = MV::add_umv(ref_mv_fwd, binfo.get_mv(0), pinfo.get_mvmode()); }
                            if has_bwd { ref_mv_bwd = MV::add_umv(ref_mv_bwd, binfo.get_mv2(0), pinfo.get_mvmode()); }
                            if let (Some(ref bck_buf), Some(ref fwd_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
                                if is_direct || (!has_fwd && !has_bwd) {
                                    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 if has_fwd {
                                    bdsp.copy_blocks(&mut buf, fwd_buf, xoff, yoff, 8, 8, ref_mv_fwd);
                                } else {
                                    bdsp.copy_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 mut ref_mv_fwd = ref_mv.scale(bsdiff, tsdiff);
                        let mut ref_mv_bwd = ref_mv - ref_mv_fwd;
                        if has_fwd { ref_mv_fwd = MV::add_umv(ref_mv_fwd, binfo.get_mv(0), pinfo.get_mvmode()); }
                        if has_bwd { ref_mv_bwd = MV::add_umv(ref_mv_bwd, binfo.get_mv2(0), pinfo.get_mvmode()); }
                        if let (Some(ref bck_buf), Some(ref fwd_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
                            if is_direct || (!has_fwd && !has_bwd) {
                                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);
                            } else if has_fwd {
                                bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_fwd);
                            } else {
                                bdsp.copy_blocks(&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_bwd);
                            }
                        }
                    }
                    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])?;
                            h263_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])?;
                        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();
        }

        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, 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
32007ad9	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;
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 KS	53	B = if !first_line { self.mv[mb_x * 2 + 1] } else { A };
32007ad9 KS	54	C = if !first_line && !last { self.mv[mb_x * 2 + 2] } else { 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	}
	93	}
	94
21c16d5f KS	95	#[allow(dead_code)]
	96	#[derive(Clone,Copy)]
	97	struct BMB {
	98	num_mv: usize,
	99	mv_f: [MV; 4],
	100	mv_b: [MV; 4],
	101	fwd: bool,
	102	blk: [[i16; 64]; 6],
	103	cbp: u8,
	104	}
	105
	106	impl BMB {
	107	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} }
	108	}
	109
ef3209c7 KS	110	#[derive(Clone,Copy)]
	111	struct PredCoeffs {
	112	hor: [[i16; 8]; 6],
	113	ver: [[i16; 8]; 6],
	114	}
	115
	116	const ZERO_PRED_COEFFS: PredCoeffs = PredCoeffs { hor: [[0; 8]; 6], ver: [[0; 8]; 6] };
	117
88c58b1b	118	pub struct H263BaseDecoder {
cf64af13 KS	119	w: usize,
	120	h: usize,
	121	mb_w: usize,
	122	mb_h: usize,
	123	num_mb: usize,
	124	ftype: Type,
32007ad9 KS	125	ipbs: IPBShuffler,
	126	next_ts: u16,
	127	last_ts: u16,
	128	tsdiff: u16,
21c16d5f KS	129	has_b: bool,
21c16d5f KS	130	b_data: Vec<BMB>,
ef3209c7	131	pred_coeffs: Vec<PredCoeffs>,
42a59352	132	is_gob: bool,
32007ad9 KS	133	may_have_b_frames: bool,
32007ad9 KS	134	mv_data: Vec<BlockMVInfo>,
ef3209c7 KS	135	}
	136
	137	#[inline]
	138	fn clip_dc(dc: i16) -> i16 {
	139	if dc < 0 { 0 }
	140	else if dc > 2046 { 2046 }
	141	else { (dc + 1) & !1 }
	142	}
	143
	144	#[inline]
	145	fn clip_ac(ac: i16) -> i16 {
	146	if ac < -2048 { -2048 }
	147	else if ac > 2047 { 2047 }
	148	else { ac }
cf64af13 KS	149	}
	150
	151	#[allow(dead_code)]
88c58b1b	152	impl H263BaseDecoder {
32007ad9	153	pub fn new_with_opts(is_gob: bool, may_have_b_frames: bool) -> Self {
88c58b1b	154	H263BaseDecoder{
cf64af13 KS	155	w: 0, h: 0, mb_w: 0, mb_h: 0, num_mb: 0,
cf64af13 KS	156	ftype: Type::Special,
32007ad9 KS	157	ipbs: IPBShuffler::new(),
32007ad9 KS	158	last_ts: 0, next_ts: 0, tsdiff: 0,
21c16d5f	159	has_b: false, b_data: Vec::new(),
ef3209c7	160	pred_coeffs: Vec::new(),
42a59352	161	is_gob: is_gob,
32007ad9 KS	162	may_have_b_frames: may_have_b_frames,
32007ad9 KS	163	mv_data: Vec::new(),
cf64af13 KS	164	}
cf64af13 KS	165	}
32007ad9 KS	166	pub fn new(is_gob: bool) -> Self {
	167	Self::new_with_opts(is_gob, false)
	168	}
	169	pub fn new_b_frames(is_gob: bool) -> Self {
	170	Self::new_with_opts(is_gob, true)
	171	}
cf64af13 KS	172
cf64af13 KS	173	pub fn is_intra(&self) -> bool { self.ftype == Type::I }
2eb21477 KS	174	pub fn get_frame_type(&self) -> FrameType {
	175	match self.ftype {
	176	Type::I => FrameType::I,
	177	Type::P => FrameType::P,
	178	Type::B => FrameType::B,
	179	Type::PB => FrameType::P,
	180	Type::Skip => FrameType::Skip,
	181	Type::Special => FrameType::Skip,
	182	}
	183	}
cf64af13 KS	184	pub fn get_dimensions(&self) -> (usize, usize) { (self.w, self.h) }
cf64af13 KS	185
2a2aa421	186	pub fn parse_frame(&mut self, bd: &mut BlockDecoder, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
cf64af13	187	let pinfo = bd.decode_pichdr()?;
21c16d5f	188	let mut mvi = MVInfo::new();
f2f1afb2	189	let mut cbpi = CBPInfo::new();
cf64af13 KS	190
	191	//todo handle res change
	192	self.w = pinfo.w;
	193	self.h = pinfo.h;
	194	self.mb_w = (pinfo.w + 15) >> 4;
	195	self.mb_h = (pinfo.h + 15) >> 4;
	196	self.num_mb = self.mb_w * self.mb_h;
	197	self.ftype = pinfo.mode;
21c16d5f KS	198	self.has_b = pinfo.is_pb();
	199
	200	if self.has_b {
32007ad9	201	self.mv_data.truncate(0);
21c16d5f	202	}
cf64af13	203
32007ad9 KS	204	let save_b_data = pinfo.mode.is_ref() && self.may_have_b_frames;
	205	if save_b_data {
	206	self.mv_data.truncate(0);
	207	}
cf64af13	208
32007ad9 KS	209	let tsdiff = pinfo.ts.wrapping_sub(self.last_ts) >> 1;
	210	let bsdiff = if pinfo.is_pb() { (pinfo.get_pbinfo().get_trb() as u16) << 7 }
	211	else { pinfo.ts.wrapping_sub(self.next_ts) >> 1 };
21c16d5f	212
cf64af13 KS	213	let fmt = formats::YUV420_FORMAT;
	214	let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
	215	let bufret = alloc_video_buffer(vinfo, 4);
	216	if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
	217	let mut bufinfo = bufret.unwrap();
	218	let mut buf = bufinfo.get_vbuf().unwrap();
	219
42a59352	220	let mut slice = if self.is_gob {
2a2aa421 KS	221	SliceInfo::get_default_slice(&pinfo)
	222	} else {
	223	bd.decode_slice_header(&pinfo)?
	224	};
2324f30b	225	mvi.reset(self.mb_w, 0, pinfo.get_mvmode());
f2f1afb2	226	cbpi.reset(self.mb_w);
cf64af13 KS	227
cf64af13 KS	228	let mut blk: [[i16; 64]; 6] = [[0; 64]; 6];
2a2aa421 KS	229	let mut sstate = SliceState::new(pinfo.mode == Type::I);
2a2aa421 KS	230	let mut mb_pos = 0;
ef3209c7 KS	231	let apply_acpred = (pinfo.mode == Type::I) && pinfo.plusinfo.is_some() && pinfo.plusinfo.unwrap().aic;
	232	if apply_acpred {
	233	self.pred_coeffs.truncate(0);
	234	self.pred_coeffs.resize(self.mb_w * self.mb_h, ZERO_PRED_COEFFS);
	235	}
cf64af13 KS	236	for mb_y in 0..self.mb_h {
	237	for mb_x in 0..self.mb_w {
	238	for i in 0..6 { for j in 0..64 { blk[i][j] = 0; } }
	239
2a2aa421	240	if slice.is_at_end(mb_pos) \|\| (slice.needs_check() && mb_pos > 0 && bd.is_slice_end()) {
cf64af13	241	slice = bd.decode_slice_header(&pinfo)?;
6f21f5f4 KS	242	if !self.is_gob {
	243	mvi.reset(self.mb_w, mb_x, pinfo.get_mvmode());
	244	cbpi.reset(self.mb_w);
32007ad9	245	sstate.reset_slice(mb_x, mb_y);
6f21f5f4	246	}
cf64af13 KS	247	}
cf64af13 KS	248
2a2aa421	249	let binfo = bd.decode_block_header(&pinfo, &slice, &sstate)?;
cf64af13	250	let cbp = binfo.get_cbp();
f2f1afb2 KS	251	cbpi.set_cbp(mb_x, cbp);
f2f1afb2 KS	252	cbpi.set_q(mb_x, binfo.get_q());
cf64af13	253	if binfo.is_intra() {
32007ad9 KS	254	if save_b_data {
	255	self.mv_data.push(BlockMVInfo::Intra);
	256	}
cf64af13	257	for i in 0..6 {
2a2aa421	258	bd.decode_block_intra(&binfo, &sstate, binfo.get_q(), i, (cbp & (1 << (5 - i))) != 0, &mut blk[i])?;
ef3209c7	259	if apply_acpred && (binfo.acpred != ACPredMode::None) {
2eb21477	260	let has_b = (i == 1) \|\| (i == 3) \|\| !sstate.first_mb;
6f21f5f4	261	let has_a = (i == 2) \|\| (i == 3) \|\| !sstate.first_line;
ef3209c7 KS	262	let (b_mb, b_blk) = if has_b {
	263	if (i == 1) \|\| (i == 3) {
	264	(mb_pos, i - 1)
	265	} else if i < 4 {
	266	(mb_pos - 1, i + 1)
	267	} else {
	268	(mb_pos - 1, i)
	269	}
	270	} else { (0, 0) };
	271	let (a_mb, a_blk) = if has_a {
	272	if (i == 2) \|\| (i == 3) {
	273	(mb_pos, i - 2)
	274	} else if i < 4 {
	275	(mb_pos - self.mb_w, i + 2)
	276	} else {
	277	(mb_pos - self.mb_w, i)
	278	}
	279	} else { (0, 0) };
	280	match binfo.acpred {
	281	ACPredMode::DC => {
	282	let dc;
	283	if has_a && has_b {
	284	dc = (self.pred_coeffs[b_mb].hor[b_blk][0] + self.pred_coeffs[a_mb].ver[a_blk][0]) / 2;
	285	} else if has_a {
	286	dc = self.pred_coeffs[a_mb].ver[a_blk][0];
	287	} else if has_b {
	288	dc = self.pred_coeffs[b_mb].hor[b_blk][0];
	289	} else {
	290	dc = 1024;
	291	}
	292	blk[i][0] = clip_dc(blk[i][0] + dc);
	293	},
	294	ACPredMode::Hor => {
	295	if has_b {
	296	for k in 0..8 {
	297	blk[i][k * 8] += self.pred_coeffs[b_mb].hor[b_blk][k];
	298	}
	299	for k in 1..8 {
	300	blk[i][k * 8] = clip_ac(blk[i][k * 8]);
	301	}
	302	} else {
	303	blk[i][0] += 1024;
	304	}
	305	blk[i][0] = clip_dc(blk[i][0]);
	306	},
	307	ACPredMode::Ver => {
	308	if has_a {
	309	for k in 0..8 {
	310	blk[i][k] += self.pred_coeffs[a_mb].ver[a_blk][k];
	311	}
	312	for k in 1..8 {
	313	blk[i][k] = clip_ac(blk[i][k]);
	314	}
	315	} else {
	316	blk[i][0] += 1024;
	317	}
	318	blk[i][0] = clip_dc(blk[i][0]);
	319	},
	320	ACPredMode::None => {},
	321	};
	322	for t in 0..8 { self.pred_coeffs[mb_pos].hor[i][t] = blk[i][t * 8]; }
	323	for t in 0..8 { self.pred_coeffs[mb_pos].ver[i][t] = blk[i][t]; }
	324	}
cf64af13 KS	325	h263_idct(&mut blk[i]);
	326	}
	327	blockdsp::put_blocks(&mut buf, mb_x, mb_y, &blk);
	328	mvi.set_zero_mv(mb_x);
2eb21477	329	} else if (binfo.mode != Type::B) && !binfo.is_skipped() {
cf64af13	330	if binfo.get_num_mvs() == 1 {
32007ad9 KS	331	let mv = mvi.predict(mb_x, 0, false, binfo.get_mv(0), sstate.first_line, sstate.first_mb);
	332	if save_b_data {
	333	self.mv_data.push(BlockMVInfo::Inter_1MV(mv));
	334	}
	335	if let Some(ref srcbuf) = self.ipbs.get_lastref() {
2a2aa421	336	bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, mv);
cf64af13 KS	337	}
cf64af13 KS	338	} else {
32007ad9	339	let mut mv: [MV; 4] = [ZERO_MV, ZERO_MV, ZERO_MV, ZERO_MV];
cf64af13	340	for blk_no in 0..4 {
32007ad9 KS	341	mv[blk_no] = mvi.predict(mb_x, blk_no, true, binfo.get_mv(blk_no), sstate.first_line, sstate.first_mb);
32007ad9 KS	342	if let Some(ref srcbuf) = self.ipbs.get_lastref() {
2a2aa421 KS	343	bdsp.copy_blocks(&mut buf, srcbuf,
2a2aa421 KS	344	mb_x * 16 + (blk_no & 1) * 8,
32007ad9	345	mb_y * 16 + (blk_no & 2) * 4, 8, 8, mv[blk_no]);
cf64af13 KS	346	}
cf64af13 KS	347	}
32007ad9 KS	348	if save_b_data {
	349	self.mv_data.push(BlockMVInfo::Inter_4MV(mv));
	350	}
cf64af13 KS	351	}
cf64af13 KS	352	for i in 0..6 {
2a2aa421	353	bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
cf64af13 KS	354	h263_idct(&mut blk[i]);
	355	}
	356	blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
2eb21477	357	} else if binfo.mode != Type::B {
32007ad9	358	self.mv_data.push(BlockMVInfo::Inter_1MV(ZERO_MV));
cf64af13	359	mvi.set_zero_mv(mb_x);
32007ad9	360	if let Some(ref srcbuf) = self.ipbs.get_lastref() {
2a2aa421	361	bdsp.copy_blocks(&mut buf, srcbuf, mb_x * 16, mb_y * 16, 16, 16, ZERO_MV);
cf64af13	362	}
2eb21477	363	} else {
32007ad9 KS	364	let ref_mv_info = self.mv_data[mb_pos];
	365	let has_fwd = binfo.get_num_mvs() > 0;
	366	let has_bwd = binfo.get_num_mvs2() > 0;
	367	let is_direct = has_fwd && has_bwd;
	368	//todo refactor
	369	if let BlockMVInfo::Inter_4MV(mvs) = ref_mv_info {
	370	for blk_no in 0..4 {
	371	let ref_mv = mvs[blk_no];
	372	let mut ref_mv_fwd = ref_mv.scale(bsdiff, tsdiff);
	373	let mut ref_mv_bwd = ref_mv - ref_mv_fwd;
	374	let xoff = mb_x * 16 + (blk_no & 1) * 8;
	375	let yoff = mb_y * 16 + (blk_no & 2) * 4;
	376	if has_fwd { ref_mv_fwd = MV::add_umv(ref_mv_fwd, binfo.get_mv(0), pinfo.get_mvmode()); }
	377	if has_bwd { ref_mv_bwd = MV::add_umv(ref_mv_bwd, binfo.get_mv2(0), pinfo.get_mvmode()); }
	378	if let (Some(ref bck_buf), Some(ref fwd_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
	379	if is_direct \|\| (!has_fwd && !has_bwd) {
	380	bdsp.copy_blocks(&mut buf, fwd_buf, xoff, yoff, 8, 8, ref_mv_fwd);
	381	bdsp.avg_blocks(&mut buf, bck_buf, xoff, yoff, 8, 8, ref_mv_bwd);
	382	} else if has_fwd {
	383	bdsp.copy_blocks(&mut buf, fwd_buf, xoff, yoff, 8, 8, ref_mv_fwd);
	384	} else {
	385	bdsp.copy_blocks(&mut buf, bck_buf, xoff, yoff, 8, 8, ref_mv_bwd);
	386	}
	387	}
	388	}
	389	} else {
	390	let ref_mv = if let BlockMVInfo::Inter_1MV(mv_) = ref_mv_info { mv_ } else { ZERO_MV };
	391	let mut ref_mv_fwd = ref_mv.scale(bsdiff, tsdiff);
	392	let mut ref_mv_bwd = ref_mv - ref_mv_fwd;
	393	if has_fwd { ref_mv_fwd = MV::add_umv(ref_mv_fwd, binfo.get_mv(0), pinfo.get_mvmode()); }
	394	if has_bwd { ref_mv_bwd = MV::add_umv(ref_mv_bwd, binfo.get_mv2(0), pinfo.get_mvmode()); }
	395	if let (Some(ref bck_buf), Some(ref fwd_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
	396	if is_direct \|\| (!has_fwd && !has_bwd) {
	397	bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_fwd);
	398	bdsp.avg_blocks(&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_bwd);
	399	} else if has_fwd {
	400	bdsp.copy_blocks(&mut buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_fwd);
	401	} else {
	402	bdsp.copy_blocks(&mut buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, ref_mv_bwd);
	403	}
	404	}
	405	}
2eb21477 KS	406	if cbp != 0 {
	407	for i in 0..6 {
	408	bd.decode_block_inter(&binfo, &sstate, binfo.get_q(), i, ((cbp >> (5 - i)) & 1) != 0, &mut blk[i])?;
	409	h263_idct(&mut blk[i]);
	410	}
32007ad9	411	blockdsp::add_blocks(&mut buf, mb_x, mb_y, &blk);
2eb21477	412	}
cf64af13	413	}
21c16d5f KS	414	if pinfo.is_pb() {
21c16d5f KS	415	let mut b_mb = BMB::new();
cf64af13	416	let cbp = binfo.get_cbp_b();
21c16d5f KS	417	let bq = (((pinfo.get_pbinfo().get_dbquant() + 5) as u16) * (binfo.get_q() as u16)) >> 2;
	418	let bquant;
	419	if bq < 1 { bquant = 1; }
	420	else if bq > 31 { bquant = 31; }
	421	else { bquant = bq as u8; }
	422
	423	b_mb.cbp = cbp;
cf64af13	424	for i in 0..6 {
2a2aa421	425	bd.decode_block_inter(&binfo, &sstate, bquant, i, (cbp & (1 << (5 - i))) != 0, &mut b_mb.blk[i])?;
21c16d5f	426	h263_idct(&mut b_mb.blk[i]);
cf64af13	427	}
21c16d5f	428
88c58b1b	429	let is_fwd = !binfo.is_b_fwd();
21c16d5f KS	430	b_mb.fwd = is_fwd;
	431	b_mb.num_mv = binfo.get_num_mvs();
	432	if binfo.get_num_mvs() == 0 {
	433	b_mb.num_mv = 1;
	434	b_mb.mv_f[0] = binfo.get_mv2(1);
	435	b_mb.mv_b[0] = binfo.get_mv2(0);
88c58b1b KS	436	} else if binfo.get_num_mvs() == 1 {
88c58b1b KS	437	let src_mv = binfo.get_mv(0).scale(bsdiff, tsdiff);
2324f30b	438	let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
21c16d5f KS	439	let mv_b = MV::b_sub(binfo.get_mv(0), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
	440	b_mb.mv_f[0] = mv_f;
	441	b_mb.mv_b[0] = mv_b;
	442	} else {
	443	for blk_no in 0..4 {
88c58b1b	444	let src_mv = binfo.get_mv(blk_no).scale(bsdiff, tsdiff);
2324f30b	445	let mv_f = MV::add_umv(src_mv, binfo.get_mv2(0), pinfo.get_mvmode());
21c16d5f KS	446	let mv_b = MV::b_sub(binfo.get_mv(blk_no), mv_f, binfo.get_mv2(0), bsdiff, tsdiff);
	447	b_mb.mv_f[blk_no] = mv_f;
	448	b_mb.mv_b[blk_no] = mv_b;
cf64af13 KS	449	}
cf64af13 KS	450	}
21c16d5f	451	self.b_data.push(b_mb);
cf64af13	452	}
2a2aa421 KS	453	sstate.next_mb();
2a2aa421 KS	454	mb_pos += 1;
cf64af13	455	}
2a2aa421 KS	456	if let Some(plusinfo) = pinfo.plusinfo {
	457	if plusinfo.deblock {
	458	bdsp.filter_row(&mut buf, mb_y, self.mb_w, &cbpi);
	459	}
f2f1afb2	460	}
cf64af13	461	mvi.update_row();
f2f1afb2	462	cbpi.update_row();
2a2aa421	463	sstate.new_row();
cf64af13	464	}
32007ad9 KS	465
	466	if pinfo.mode.is_ref() {
	467	self.ipbs.add_frame(buf);
	468	self.next_ts = self.last_ts;
	469	self.last_ts = pinfo.ts;
	470	self.tsdiff = tsdiff;
	471	}
	472
cf64af13 KS	473	Ok(bufinfo)
	474	}
	475
2a2aa421	476	pub fn get_bframe(&mut self, bdsp: &BlockDSP) -> DecoderResult<NABufferType> {
32007ad9	477	if !self.has_b \|\| !self.ipbs.get_lastref().is_some() \|\| !self.ipbs.get_nextref().is_some() {
21c16d5f KS	478	return Err(DecoderError::MissingReference);
	479	}
	480	self.has_b = false;
	481
	482	let fmt = formats::YUV420_FORMAT;
	483	let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
	484	let bufret = alloc_video_buffer(vinfo, 4);
	485	if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
	486	let mut bufinfo = bufret.unwrap();
	487	let mut b_buf = bufinfo.get_vbuf().unwrap();
	488
32007ad9 KS	489	if let (Some(ref bck_buf), Some(ref fwd_buf)) = (self.ipbs.get_nextref(), self.ipbs.get_lastref()) {
32007ad9 KS	490	recon_b_frame(&mut b_buf, bck_buf, fwd_buf, self.mb_w, self.mb_h, &self.b_data, bdsp);
21c16d5f KS	491	}
	492
	493	self.b_data.truncate(0);
	494	Ok(bufinfo)
	495	}
	496	}
	497
	498	fn recon_b_frame(b_buf: &mut NAVideoBuffer<u8>, bck_buf: &NAVideoBuffer<u8>, fwd_buf: &NAVideoBuffer<u8>,
2a2aa421	499	mb_w: usize, mb_h: usize, b_data: &Vec<BMB>, bdsp: &BlockDSP) {
f2f1afb2	500	let mut cbpi = CBPInfo::new();
21c16d5f	501	let mut cur_mb = 0;
f2f1afb2	502	cbpi.reset(mb_w);
21c16d5f KS	503	for mb_y in 0..mb_h {
	504	for mb_x in 0..mb_w {
	505	let num_mv = b_data[cur_mb].num_mv;
	506	let is_fwd = b_data[cur_mb].fwd;
f2f1afb2 KS	507	let cbp = b_data[cur_mb].cbp;
	508	cbpi.set_cbp(mb_x, cbp);
	509	if num_mv == 1 {
2a2aa421	510	bdsp.copy_blocks(b_buf, fwd_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_b[0]);
21c16d5f	511	if !is_fwd {
2a2aa421	512	bdsp.avg_blocks(b_buf, bck_buf, mb_x * 16, mb_y * 16, 16, 16, b_data[cur_mb].mv_f[0]);
21c16d5f KS	513	}
	514	} else {
	515	for blk_no in 0..4 {
	516	let xpos = mb_x * 16 + (blk_no & 1) * 8;
	517	let ypos = mb_y * 16 + (blk_no & 2) * 4;
2a2aa421	518	bdsp.copy_blocks(b_buf, fwd_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_b[blk_no]);
21c16d5f	519	if !is_fwd {
2a2aa421	520	bdsp.avg_blocks(b_buf, bck_buf, xpos, ypos, 8, 8, b_data[cur_mb].mv_f[blk_no]);
21c16d5f KS	521	}
	522	}
	523	}
f2f1afb2	524	if cbp != 0 {
21c16d5f KS	525	blockdsp::add_blocks(b_buf, mb_x, mb_y, &b_data[cur_mb].blk);
	526	}
	527	cur_mb += 1;
cf64af13	528	}
f2f1afb2	529	cbpi.update_row();
cf64af13 KS	530	}
cf64af13 KS	531	}