nihav-core/src/codecs/h263/mod.rs

   1 use super::{DecoderResult, MV, ZERO_MV};
   2 use crate::frame::NAVideoBuffer;
   3
   4 #[allow(clippy::many_single_char_names)]
   5 pub mod code;
   6 pub mod data;
   7 #[allow(clippy::needless_range_loop)]
   8 pub mod decoder;
   9
  10 pub trait BlockDecoder {
  11     fn decode_pichdr(&mut self) -> DecoderResult<PicInfo>;
  12     fn decode_slice_header(&mut self, pinfo: &PicInfo) -> DecoderResult<SliceInfo>;
  13     fn decode_block_header(&mut self, pinfo: &PicInfo, sinfo: &SliceInfo, sstate: &SliceState) -> DecoderResult<BlockInfo>;
  14     fn decode_block_intra(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()>;
  15     fn decode_block_inter(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()>;
  16     fn is_slice_end(&mut self) -> bool;
  17 }
  18
  19 pub trait BlockDSP {
  20     fn idct(&self, blk: &mut [i16; 64]);
  21     fn copy_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: &NAVideoBuffer<u8>, xpos: usize, ypos: usize, w: usize, h: usize, mv: MV);
  22     fn avg_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: &NAVideoBuffer<u8>, xpos: usize, ypos: usize, w: usize, h: usize, mv: MV);
  23     fn filter_row(&self, buf: &mut NAVideoBuffer<u8>, mb_y: usize, mb_w: usize, cbpi: &CBPInfo);
  24 }
  25
  26 #[allow(dead_code)]
  27 #[derive(Debug,Clone,Copy,PartialEq)]
  28 pub enum Type {
  29     I, P, PB, Skip, B, Special
  30 }
  31
  32 impl Type {
  33     pub fn is_ref(self) -> bool {
  34         match self {
  35             Type::I | Type::P | Type::PB => true,
  36             _                            => false,
  37         }
  38     }
  39 }
  40
  41 #[allow(dead_code)]
  42 #[derive(Debug,Clone,Copy)]
  43 pub struct PBInfo {
  44     trb:        u8,
  45     dbquant:    u8,
  46     improved:   bool,
  47 }
  48
  49 impl PBInfo {
  50     pub fn new(trb: u8, dbquant: u8, improved: bool) -> Self {
  51         PBInfo{ trb, dbquant, improved }
  52     }
  53     pub fn get_trb(self) -> u8 { self.trb }
  54     pub fn get_dbquant(self) -> u8 { self.dbquant }
  55     pub fn is_improved(self) -> bool { self.improved }
  56 }
  57
  58 #[allow(dead_code)]
  59 #[derive(Debug,Clone,Copy)]
  60 pub struct PicInfo {
  61     pub w:          usize,
  62     pub h:          usize,
  63     pub mode:       Type,
  64     pub mvmode:     MVMode,
  65     pub umv:        bool,
  66     pub apm:        bool,
  67     pub quant:      u8,
  68     pub pb:         Option<PBInfo>,
  69     pub ts:         u16,
  70     pub plusinfo:   Option<PlusInfo>,
  71 }
  72
  73 #[allow(dead_code)]
  74 impl PicInfo {
  75     pub fn new(w: usize, h: usize, mode: Type, mvmode: MVMode, umv: bool, apm: bool, quant: u8, ts: u16, pb: Option<PBInfo>, plusinfo: Option<PlusInfo>) -> Self {
  76         PicInfo {
  77             w, h, mode, mvmode,
  78             umv, apm, quant,
  79             pb, ts, plusinfo
  80         }
  81     }
  82     pub fn get_width(&self) -> usize { self.w }
  83     pub fn get_height(&self) -> usize { self.h }
  84     pub fn get_mode(&self) -> Type { self.mode }
  85     pub fn get_quant(&self) -> u8 { self.quant }
  86     pub fn get_apm(&self) -> bool { self.apm }
  87     pub fn is_pb(&self) -> bool { self.pb.is_some() }
  88     pub fn is_ipb(&self) -> bool {
  89             if let Some(ref pbi) = self.pb {
  90                 pbi.is_improved()
  91             } else {
  92                 false
  93             }
  94         }
  95     pub fn get_ts(&self) -> u16 { self.ts }
  96     pub fn get_pbinfo(&self) -> PBInfo { self.pb.unwrap() }
  97     pub fn get_plusifo(&self) -> Option<PlusInfo> { self.plusinfo }
  98     pub fn get_mvmode(&self) -> MVMode { self.mvmode }
  99 }
 100
 101 #[allow(dead_code)]
 102 #[derive(Debug,Clone,Copy)]
 103 pub struct PlusInfo {
 104     pub aic:        bool,
 105     pub deblock:    bool,
 106     pub aiv_mode:   bool,
 107     pub mq_mode:    bool,
 108 }
 109
 110 impl PlusInfo {
 111     pub fn new(aic: bool, deblock: bool, aiv_mode: bool, mq_mode: bool) -> Self {
 112         PlusInfo { aic, deblock, aiv_mode, mq_mode }
 113     }
 114 }
 115
 116 #[allow(dead_code)]
 117 #[derive(Debug,Clone,Copy)]
 118 pub struct SliceInfo {
 119     pub mb_x:   usize,
 120     pub mb_y:   usize,
 121     pub mb_end: usize,
 122     pub quant:  u8,
 123 }
 124
 125 #[allow(dead_code)]
 126 #[derive(Debug,Clone,Copy)]
 127 pub struct SliceState {
 128     pub is_iframe:  bool,
 129     pub mb_x:       usize,
 130     pub mb_y:       usize,
 131     pub first_line: bool,
 132     pub first_mb:   bool,
 133     pub slice_mb_x: usize,
 134     pub slice_mb_y: usize,
 135     pub quant:      u8,
 136 }
 137
 138 const SLICE_NO_END: usize = 99999999;
 139
 140 impl SliceInfo {
 141     pub fn new(mb_x: usize, mb_y: usize, mb_end: usize, quant: u8) -> Self {
 142         SliceInfo{ mb_x, mb_y, mb_end, quant }
 143     }
 144     pub fn new_gob(mb_x: usize, mb_y: usize, quant: u8) -> Self {
 145         SliceInfo{ mb_x, mb_y, mb_end: SLICE_NO_END, quant }
 146     }
 147     pub fn get_default_slice(pinfo: &PicInfo) -> Self {
 148         SliceInfo{ mb_x: 0, mb_y: 0, mb_end: SLICE_NO_END, quant: pinfo.get_quant() }
 149     }
 150     pub fn get_quant(&self) -> u8 { self.quant }
 151     pub fn is_at_end(&self, mb_pos: usize) -> bool { self.mb_end == mb_pos }
 152     pub fn needs_check(&self) -> bool { self.mb_end == SLICE_NO_END }
 153 }
 154
 155 impl SliceState {
 156     pub fn new(is_iframe: bool) -> Self {
 157         SliceState {
 158             is_iframe, mb_x: 0, mb_y: 0, first_line: true, first_mb: true,
 159             slice_mb_x: 0, slice_mb_y: 0, quant: 0
 160         }
 161     }
 162     pub fn next_mb(&mut self) {
 163         self.mb_x += 1; self.first_mb = false;
 164         if self.mb_x >= self.slice_mb_x && self.mb_y > self.slice_mb_y {
 165             self.first_line = false;
 166         }
 167     }
 168     pub fn new_row(&mut self) {
 169         self.mb_x = 0; self.mb_y += 1;
 170         if self.mb_x >= self.slice_mb_x && self.mb_y > self.slice_mb_y {
 171             self.first_line = false;
 172         }
 173         self.first_mb = true;
 174     }
 175     pub fn reset_slice(&mut self, smb_x: usize, smb_y: usize) {
 176         self.slice_mb_x = smb_x;
 177         self.slice_mb_y = smb_y;
 178         self.first_line = true;
 179         self.first_mb   = true;
 180     }
 181 }
 182
 183 #[derive(Debug,Clone,Copy)]
 184 pub struct BlockInfo {
 185     pub intra:   bool,
 186     pub skip:    bool,
 187     pub mode:    Type,
 188     pub cbp:     u8,
 189     pub q:       u8,
 190     pub mv:      [MV; 4],
 191     pub num_mv:  usize,
 192     pub bpart:   bool,
 193     pub b_cbp:   u8,
 194     pub mv2:     [MV; 2],
 195     pub num_mv2: usize,
 196     pub fwd:     bool,
 197     pub acpred:  ACPredMode,
 198 }
 199
 200 #[allow(dead_code)]
 201 #[derive(Debug,Clone,Copy)]
 202 pub struct BBlockInfo {
 203     present: bool,
 204     cbp:     u8,
 205     num_mv:  usize,
 206     fwd:     bool,
 207 }
 208
 209 #[allow(non_camel_case_types)]
 210 #[derive(Debug,Clone,Copy)]
 211 pub enum BlockMVInfo {
 212     Intra,
 213     Inter_1MV(MV),
 214     Inter_4MV([MV; 4]),
 215 }
 216
 217 #[allow(dead_code)]
 218 #[derive(Debug,Clone,Copy,PartialEq)]
 219 pub enum ACPredMode {
 220     None,
 221     DC,
 222     Ver,
 223     Hor,
 224 }
 225
 226 #[allow(dead_code)]
 227 impl BlockInfo {
 228     pub fn new(mode: Type, cbp: u8, q: u8) -> Self {
 229         BlockInfo {
 230             intra:   mode == Type::I,
 231             skip:    (cbp == 0) && (mode != Type::I),
 232             mode,
 233             cbp,
 234             q,
 235             mv:      [MV::new(0, 0), MV::new(0, 0), MV::new(0, 0), MV::new(0, 0)],
 236             num_mv:  0,
 237             bpart:   false,
 238             b_cbp:   0,
 239             mv2:     [ZERO_MV, ZERO_MV],
 240             num_mv2: 0,
 241             fwd:     false,
 242             acpred:  ACPredMode::None,
 243         }
 244     }
 245     pub fn is_intra(&self) -> bool { self.intra }
 246     pub fn is_skipped(&self) -> bool { self.skip }
 247     pub fn get_mode(&self) -> Type { self.mode }
 248     pub fn get_cbp(&self) -> u8 { self.cbp }
 249     pub fn get_q(&self) -> u8 { self.q }
 250     pub fn get_num_mvs(&self) -> usize { self.num_mv }
 251     pub fn get_mv(&self, idx: usize) -> MV { self.mv[idx] }
 252     pub fn has_b_part(&self) -> bool { self.bpart }
 253     pub fn get_cbp_b(&self) -> u8 { self.b_cbp }
 254     pub fn get_num_mvs2(&self) -> usize { self.num_mv2 }
 255     pub fn get_mv2(&self, idx: usize) -> MV { self.mv2[idx] }
 256     pub fn set_mv(&mut self, mvs: &[MV]) {
 257         if !mvs.is_empty() { self.skip = false; }
 258         let mut mv_arr: [MV; 4] = [MV::new(0, 0), MV::new(0, 0), MV::new(0, 0), MV::new(0, 0)];
 259         for i in 0..mvs.len() { mv_arr[i] = mvs[i]; }
 260         self.mv     = mv_arr;
 261         self.num_mv = mvs.len();
 262     }
 263     pub fn set_bpart(&mut self, bbinfo: BBlockInfo) {
 264         self.bpart = bbinfo.present;
 265         self.b_cbp = bbinfo.cbp;
 266         self.fwd   = bbinfo.fwd;
 267         self.num_mv2 = bbinfo.get_num_mv();
 268     }
 269     pub fn set_b_mv(&mut self, mvs: &[MV]) {
 270         if !mvs.is_empty() { self.skip = false; }
 271         let mut mv_arr: [MV; 2] = [ZERO_MV, ZERO_MV];
 272         for i in 0..mvs.len() { mv_arr[i] = mvs[i]; }
 273         self.mv2     = mv_arr;
 274         self.num_mv2 = mvs.len();
 275     }
 276     pub fn is_b_fwd(&self) -> bool { self.fwd }
 277     pub fn set_acpred(&mut self, acpred: ACPredMode) { self.acpred = acpred }
 278     pub fn get_acpred(&self) -> ACPredMode { self.acpred }
 279 }
 280
 281 impl BBlockInfo {
 282     pub fn new(present: bool, cbp: u8, num_mv: usize, fwd: bool) -> Self {
 283         BBlockInfo {
 284             present,
 285             cbp,
 286             num_mv,
 287             fwd,
 288         }
 289     }
 290     pub fn get_num_mv(&self) -> usize { self.num_mv }
 291 }
 292
 293 #[derive(Debug,Clone,Copy)]
 294 pub enum MVMode {
 295     Old,
 296     Long,
 297     UMV,
 298 }
 299
 300 pub trait H263MVTrait {
 301     fn add_umv(pred_mv: MV, add: MV, mvmode: MVMode) -> MV;
 302     fn scale(&self, trb: u16, trd: u16) -> MV;
 303     fn b_sub(pvec: MV, fwdvec: MV, bvec: MV, trb: u16, trd: u16) -> MV;
 304 }
 305
 306 impl H263MVTrait for MV {
 307     fn add_umv(pred_mv: MV, add: MV, mvmode: MVMode) -> MV {
 308         let mut new_mv = pred_mv + add;
 309         match mvmode {
 310             MVMode::Old => {
 311                     if      new_mv.x >=  64 { new_mv.x -= 64; }
 312                     else if new_mv.x <= -64 { new_mv.x += 64; }
 313                     if      new_mv.y >=  64 { new_mv.y -= 64; }
 314                     else if new_mv.y <= -64 { new_mv.y += 64; }
 315                 },
 316             MVMode::Long => {
 317                     if      new_mv.x >  31 { new_mv.x -= 64; }
 318                     else if new_mv.x < -32 { new_mv.x += 64; }
 319                     if      new_mv.y >  31 { new_mv.y -= 64; }
 320                     else if new_mv.y < -32 { new_mv.y += 64; }
 321                 },
 322             MVMode::UMV => {
 323                     if pred_mv.x >  32 && new_mv.x >  63 { new_mv.x -= 64; }
 324                     if pred_mv.x < -31 && new_mv.x < -63 { new_mv.x += 64; }
 325                     if pred_mv.y >  32 && new_mv.y >  63 { new_mv.y -= 64; }
 326                     if pred_mv.y < -31 && new_mv.y < -63 { new_mv.y += 64; }
 327                 },
 328         };
 329         new_mv
 330     }
 331     fn scale(&self, trb: u16, trd: u16) -> MV {
 332         if (trd == 0) || (trb == 0) {
 333             ZERO_MV
 334         } else {
 335             MV { x: (((self.x as i32) * (trb as i32)) / (trd as i32)) as i16, y: (((self.y as i32) * (trb as i32)) / (trd as i32)) as i16 }
 336         }
 337     }
 338     fn b_sub(pvec: MV, fwdvec: MV, bvec: MV, trb: u16, trd: u16) -> MV {
 339         let bscale = (trb as i32) - (trd as i32);
 340         let x = if bvec.x != 0 { fwdvec.x - pvec.x } else if trd != 0 { (bscale * (pvec.x as i32) / (trd as i32)) as i16 } else { 0 };
 341         let y = if bvec.y != 0 { fwdvec.y - pvec.y } else if trd != 0 { (bscale * (pvec.y as i32) / (trd as i32)) as i16 } else { 0 };
 342         MV { x, y }
 343     }
 344 }
 345
 346 #[allow(dead_code)]
 347 pub struct CBPInfo {
 348     cbp:        Vec<u8>,
 349     q:          Vec<u8>,
 350     mb_w:       usize,
 351 }
 352
 353 impl CBPInfo {
 354     fn new() -> Self { CBPInfo{ cbp: Vec::new(), q: Vec::new(), mb_w: 0 } }
 355     fn reset(&mut self, mb_w: usize) {
 356         self.mb_w = mb_w;
 357         self.cbp.truncate(0);
 358         self.cbp.resize(self.mb_w * 2, 0);
 359         self.q.truncate(0);
 360         self.q.resize(self.mb_w * 2, 0);
 361     }
 362     fn update_row(&mut self) {
 363         for i in 0..self.mb_w {
 364             self.cbp[i] = self.cbp[self.mb_w + i];
 365             self.q[i]   = self.q[self.mb_w + i];
 366         }
 367     }
 368     fn set_cbp(&mut self, mb_x: usize, cbp: u8) {
 369         self.cbp[self.mb_w + mb_x] = cbp;
 370     }
 371     fn set_q(&mut self, mb_x: usize, q: u8) {
 372         self.q[self.mb_w + mb_x] = q;
 373     }
 374     pub fn get_q(&self, mb_x: usize) -> u8 { self.q[mb_x] }
 375     pub fn is_coded(&self, mb_x: usize, blk_no: usize) -> bool {
 376         (self.cbp[self.mb_w + mb_x] & (1 << (5 - blk_no))) != 0
 377     }
 378     pub fn is_coded_top(&self, mb_x: usize, blk_no: usize) -> bool {
 379         let cbp     = self.cbp[self.mb_w + mb_x];
 380         let cbp_top = self.cbp[mb_x];
 381         match blk_no {
 382             0 => { (cbp_top & 0b001000) != 0 },
 383             1 => { (cbp_top & 0b000100) != 0 },
 384             2 => { (cbp     & 0b100000) != 0 },
 385             3 => { (cbp     & 0b010000) != 0 },
 386             4 => { (cbp_top & 0b000010) != 0 },
 387             _ => { (cbp_top & 0b000001) != 0 },
 388         }
 389     }
 390 }
 391