nihav-codec-support/src/codecs/h263/mod.rs

   1 use nihav_core::codecs::DecoderResult;
   2 use super::{MV, ZERO_MV};
   3 use nihav_core::frame::{NAVideoBuffer, NAVideoBufferRef};
   4
   5 #[allow(clippy::erasing_op)]
   6 #[allow(clippy::many_single_char_names)]
   7 pub mod code;
   8 pub mod data;
   9 #[allow(clippy::needless_range_loop)]
  10 pub mod decoder;
  11
  12 pub trait BlockDecoder {
  13     fn decode_pichdr(&mut self) -> DecoderResult<PicInfo>;
  14     fn decode_slice_header(&mut self, pinfo: &PicInfo) -> DecoderResult<SliceInfo>;
  15     fn decode_block_header(&mut self, pinfo: &PicInfo, sinfo: &SliceInfo, sstate: &SliceState) -> DecoderResult<BlockInfo>;
  16     fn decode_block_intra(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()>;
  17     fn decode_block_inter(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()>;
  18     fn is_slice_end(&mut self) -> bool;
  19 }
  20
  21 pub trait BlockDSP {
  22     fn idct(&self, blk: &mut [i16; 64]);
  23     fn copy_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mv: MV);
  24     fn copy_blocks8x8(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mvs: &[MV; 4]);
  25     fn avg_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mv: MV);
  26     fn avg_blocks8x8(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mvs: &[MV; 4]);
  27     fn filter_row(&self, buf: &mut NAVideoBuffer<u8>, mb_y: usize, mb_w: usize, cbpi: &CBPInfo);
  28 }
  29
  30 #[allow(dead_code)]
  31 #[derive(Debug,Clone,Copy,PartialEq)]
  32 pub enum Type {
  33     I, P, PB, Skip, B, Special
  34 }
  35
  36 impl Type {
  37     pub fn is_ref(self) -> bool {
  38         match self {
  39             Type::I | Type::P | Type::PB => true,
  40             _                            => false,
  41         }
  42     }
  43 }
  44
  45 #[allow(dead_code)]
  46 #[derive(Debug,Clone,Copy)]
  47 pub struct PBInfo {
  48     trb:        u8,
  49     dbquant:    u8,
  50     improved:   bool,
  51 }
  52
  53 impl PBInfo {
  54     pub fn new(trb: u8, dbquant: u8, improved: bool) -> Self {
  55         PBInfo{ trb, dbquant, improved }
  56     }
  57     pub fn get_trb(self) -> u8 { self.trb }
  58     pub fn get_dbquant(self) -> u8 { self.dbquant }
  59     pub fn is_improved(self) -> bool { self.improved }
  60 }
  61
  62 #[allow(dead_code)]
  63 #[derive(Debug,Clone,Copy)]
  64 pub struct PicInfo {
  65     pub w:          usize,
  66     pub h:          usize,
  67     pub mode:       Type,
  68     pub mvmode:     MVMode,
  69     pub umv:        bool,
  70     pub apm:        bool,
  71     pub quant:      u8,
  72     pub pb:         Option<PBInfo>,
  73     pub ts:         u16,
  74     pub plusinfo:   Option<PlusInfo>,
  75 }
  76
  77 #[allow(dead_code)]
  78 impl PicInfo {
  79     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 {
  80         PicInfo {
  81             w, h, mode, mvmode,
  82             umv, apm, quant,
  83             pb, ts, plusinfo
  84         }
  85     }
  86     pub fn get_width(&self) -> usize { self.w }
  87     pub fn get_height(&self) -> usize { self.h }
  88     pub fn get_mode(&self) -> Type { self.mode }
  89     pub fn get_quant(&self) -> u8 { self.quant }
  90     pub fn get_apm(&self) -> bool { self.apm }
  91     pub fn is_pb(&self) -> bool { self.pb.is_some() }
  92     pub fn is_ipb(&self) -> bool {
  93             if let Some(ref pbi) = self.pb {
  94                 pbi.is_improved()
  95             } else {
  96                 false
  97             }
  98         }
  99     pub fn get_ts(&self) -> u16 { self.ts }
 100     pub fn get_pbinfo(&self) -> PBInfo { self.pb.unwrap() }
 101     pub fn get_plusifo(&self) -> Option<PlusInfo> { self.plusinfo }
 102     pub fn get_mvmode(&self) -> MVMode { self.mvmode }
 103 }
 104
 105 #[allow(dead_code)]
 106 #[derive(Debug,Clone,Copy)]
 107 pub struct PlusInfo {
 108     pub aic:        bool,
 109     pub deblock:    bool,
 110     pub aiv_mode:   bool,
 111     pub mq_mode:    bool,
 112 }
 113
 114 impl PlusInfo {
 115     pub fn new(aic: bool, deblock: bool, aiv_mode: bool, mq_mode: bool) -> Self {
 116         PlusInfo { aic, deblock, aiv_mode, mq_mode }
 117     }
 118 }
 119
 120 #[allow(dead_code)]
 121 #[derive(Debug,Clone,Copy)]
 122 pub struct SliceInfo {
 123     pub mb_x:   usize,
 124     pub mb_y:   usize,
 125     pub mb_end: usize,
 126     pub quant:  u8,
 127 }
 128
 129 #[allow(dead_code)]
 130 #[derive(Debug,Clone,Copy)]
 131 pub struct SliceState {
 132     pub is_iframe:  bool,
 133     pub mb_x:       usize,
 134     pub mb_y:       usize,
 135     pub first_line: bool,
 136     pub first_mb:   bool,
 137     pub slice_mb_x: usize,
 138     pub slice_mb_y: usize,
 139     pub quant:      u8,
 140 }
 141
 142 const SLICE_NO_END: usize = 99999999;
 143
 144 impl SliceInfo {
 145     pub fn new(mb_x: usize, mb_y: usize, mb_end: usize, quant: u8) -> Self {
 146         SliceInfo{ mb_x, mb_y, mb_end, quant }
 147     }
 148     pub fn new_gob(mb_x: usize, mb_y: usize, quant: u8) -> Self {
 149         SliceInfo{ mb_x, mb_y, mb_end: SLICE_NO_END, quant }
 150     }
 151     pub fn get_default_slice(pinfo: &PicInfo) -> Self {
 152         SliceInfo{ mb_x: 0, mb_y: 0, mb_end: SLICE_NO_END, quant: pinfo.get_quant() }
 153     }
 154     pub fn get_quant(&self) -> u8 { self.quant }
 155     pub fn is_at_end(&self, mb_pos: usize) -> bool { self.mb_end == mb_pos }
 156     pub fn needs_check(&self) -> bool { self.mb_end == SLICE_NO_END }
 157 }
 158
 159 impl SliceState {
 160     pub fn new(is_iframe: bool) -> Self {
 161         SliceState {
 162             is_iframe, mb_x: 0, mb_y: 0, first_line: true, first_mb: true,
 163             slice_mb_x: 0, slice_mb_y: 0, quant: 0
 164         }
 165     }
 166     pub fn next_mb(&mut self) {
 167         self.mb_x += 1; self.first_mb = false;
 168         if self.mb_x >= self.slice_mb_x && self.mb_y > self.slice_mb_y {
 169             self.first_line = false;
 170         }
 171     }
 172     pub fn new_row(&mut self) {
 173         self.mb_x = 0; self.mb_y += 1;
 174         if self.mb_x >= self.slice_mb_x && self.mb_y > self.slice_mb_y {
 175             self.first_line = false;
 176         }
 177         self.first_mb = true;
 178     }
 179     pub fn reset_slice(&mut self, smb_x: usize, smb_y: usize) {
 180         self.slice_mb_x = smb_x;
 181         self.slice_mb_y = smb_y;
 182         self.first_line = true;
 183         self.first_mb   = true;
 184     }
 185 }
 186
 187 #[derive(Debug,Clone,Copy)]
 188 pub struct BlockInfo {
 189     pub intra:   bool,
 190     pub skip:    bool,
 191     pub mode:    Type,
 192     pub cbp:     u8,
 193     pub q:       u8,
 194     pub mv:      [MV; 4],
 195     pub num_mv:  usize,
 196     pub bpart:   bool,
 197     pub b_cbp:   u8,
 198     pub mv2:     [MV; 2],
 199     pub num_mv2: usize,
 200     pub fwd:     bool,
 201     pub acpred:  ACPredMode,
 202 }
 203
 204 #[allow(dead_code)]
 205 #[derive(Debug,Clone,Copy)]
 206 pub struct BBlockInfo {
 207     present: bool,
 208     cbp:     u8,
 209     num_mv:  usize,
 210     fwd:     bool,
 211 }
 212
 213 #[allow(non_camel_case_types)]
 214 #[derive(Debug,Clone,Copy)]
 215 pub enum BlockMVInfo {
 216     Intra,
 217     Inter_1MV(MV),
 218     Inter_4MV([MV; 4]),
 219 }
 220
 221 #[allow(dead_code)]
 222 #[derive(Debug,Clone,Copy,PartialEq)]
 223 pub enum ACPredMode {
 224     None,
 225     DC,
 226     Ver,
 227     Hor,
 228 }
 229
 230 #[allow(dead_code)]
 231 impl BlockInfo {
 232     pub fn new(mode: Type, cbp: u8, q: u8) -> Self {
 233         BlockInfo {
 234             intra:   mode == Type::I,
 235             skip:    (cbp == 0) && (mode != Type::I),
 236             mode,
 237             cbp,
 238             q,
 239             mv:      [MV::new(0, 0), MV::new(0, 0), MV::new(0, 0), MV::new(0, 0)],
 240             num_mv:  0,
 241             bpart:   false,
 242             b_cbp:   0,
 243             mv2:     [ZERO_MV, ZERO_MV],
 244             num_mv2: 0,
 245             fwd:     false,
 246             acpred:  ACPredMode::None,
 247         }
 248     }
 249     pub fn is_intra(&self) -> bool { self.intra }
 250     pub fn is_skipped(&self) -> bool { self.skip }
 251     pub fn get_mode(&self) -> Type { self.mode }
 252     pub fn get_cbp(&self) -> u8 { self.cbp }
 253     pub fn get_q(&self) -> u8 { self.q }
 254     pub fn get_num_mvs(&self) -> usize { self.num_mv }
 255     pub fn get_mv(&self, idx: usize) -> MV { self.mv[idx] }
 256     pub fn has_b_part(&self) -> bool { self.bpart }
 257     pub fn get_cbp_b(&self) -> u8 { self.b_cbp }
 258     pub fn get_num_mvs2(&self) -> usize { self.num_mv2 }
 259     pub fn get_mv2(&self, idx: usize) -> MV { self.mv2[idx] }
 260     pub fn set_mv(&mut self, mvs: &[MV]) {
 261         if !mvs.is_empty() { self.skip = false; }
 262         let mut mv_arr: [MV; 4] = [MV::new(0, 0), MV::new(0, 0), MV::new(0, 0), MV::new(0, 0)];
 263         for i in 0..mvs.len() { mv_arr[i] = mvs[i]; }
 264         self.mv     = mv_arr;
 265         self.num_mv = mvs.len();
 266     }
 267     pub fn set_bpart(&mut self, bbinfo: BBlockInfo) {
 268         self.bpart = bbinfo.present;
 269         self.b_cbp = bbinfo.cbp;
 270         self.fwd   = bbinfo.fwd;
 271         self.num_mv2 = bbinfo.get_num_mv();
 272     }
 273     pub fn set_b_mv(&mut self, mvs: &[MV]) {
 274         if !mvs.is_empty() { self.skip = false; }
 275         let mut mv_arr: [MV; 2] = [ZERO_MV, ZERO_MV];
 276         for i in 0..mvs.len() { mv_arr[i] = mvs[i]; }
 277         self.mv2     = mv_arr;
 278         self.num_mv2 = mvs.len();
 279     }
 280     pub fn is_b_fwd(&self) -> bool { self.fwd }
 281     pub fn set_acpred(&mut self, acpred: ACPredMode) { self.acpred = acpred }
 282     pub fn get_acpred(&self) -> ACPredMode { self.acpred }
 283 }
 284
 285 impl BBlockInfo {
 286     pub fn new(present: bool, cbp: u8, num_mv: usize, fwd: bool) -> Self {
 287         BBlockInfo {
 288             present,
 289             cbp,
 290             num_mv,
 291             fwd,
 292         }
 293     }
 294     pub fn get_num_mv(&self) -> usize { self.num_mv }
 295 }
 296
 297 #[derive(Debug,Clone,Copy)]
 298 pub enum MVMode {
 299     Old,
 300     Long,
 301     UMV,
 302 }
 303
 304 pub trait H263MVTrait {
 305     fn add_umv(pred_mv: MV, add: MV, mvmode: MVMode) -> MV;
 306     fn scale(&self, trb: u16, trd: u16) -> MV;
 307     fn b_sub(pvec: MV, fwdvec: MV, bvec: MV, trb: u16, trd: u16) -> MV;
 308 }
 309
 310 impl H263MVTrait for MV {
 311     fn add_umv(pred_mv: MV, add: MV, mvmode: MVMode) -> MV {
 312         let mut new_mv = pred_mv + add;
 313         match mvmode {
 314             MVMode::Old => {
 315                     if      new_mv.x >=  64 { new_mv.x -= 64; }
 316                     else if new_mv.x <= -64 { new_mv.x += 64; }
 317                     if      new_mv.y >=  64 { new_mv.y -= 64; }
 318                     else if new_mv.y <= -64 { new_mv.y += 64; }
 319                 },
 320             MVMode::Long => {
 321                     if      new_mv.x >  31 { new_mv.x -= 64; }
 322                     else if new_mv.x < -32 { new_mv.x += 64; }
 323                     if      new_mv.y >  31 { new_mv.y -= 64; }
 324                     else if new_mv.y < -32 { new_mv.y += 64; }
 325                 },
 326             MVMode::UMV => {
 327                     if pred_mv.x >  32 && new_mv.x >  63 { new_mv.x -= 64; }
 328                     if pred_mv.x < -31 && new_mv.x < -63 { new_mv.x += 64; }
 329                     if pred_mv.y >  32 && new_mv.y >  63 { new_mv.y -= 64; }
 330                     if pred_mv.y < -31 && new_mv.y < -63 { new_mv.y += 64; }
 331                 },
 332         };
 333         new_mv
 334     }
 335     fn scale(&self, trb: u16, trd: u16) -> MV {
 336         if (trd == 0) || (trb == 0) {
 337             ZERO_MV
 338         } else {
 339             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 }
 340         }
 341     }
 342     fn b_sub(pvec: MV, fwdvec: MV, bvec: MV, trb: u16, trd: u16) -> MV {
 343         let bscale = (trb as i32) - (trd as i32);
 344         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 };
 345         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 };
 346         MV { x, y }
 347     }
 348 }
 349
 350 #[allow(dead_code)]
 351 pub struct CBPInfo {
 352     cbp:        Vec<u8>,
 353     q:          Vec<u8>,
 354     mb_w:       usize,
 355 }
 356
 357 impl CBPInfo {
 358     fn new() -> Self { CBPInfo{ cbp: Vec::new(), q: Vec::new(), mb_w: 0 } }
 359     fn reset(&mut self, mb_w: usize) {
 360         self.mb_w = mb_w;
 361         self.cbp.clear();
 362         self.cbp.resize(self.mb_w * 2, 0);
 363         self.q.clear();
 364         self.q.resize(self.mb_w * 2, 0);
 365     }
 366     fn update_row(&mut self) {
 367         for i in 0..self.mb_w {
 368             self.cbp[i] = self.cbp[self.mb_w + i];
 369             self.q[i]   = self.q[self.mb_w + i];
 370         }
 371     }
 372     fn set_cbp(&mut self, mb_x: usize, cbp: u8) {
 373         self.cbp[self.mb_w + mb_x] = cbp;
 374     }
 375     fn set_q(&mut self, mb_x: usize, q: u8) {
 376         self.q[self.mb_w + mb_x] = q;
 377     }
 378     pub fn get_q(&self, mb_x: usize) -> u8 { self.q[mb_x] }
 379     pub fn is_coded(&self, mb_x: usize, blk_no: usize) -> bool {
 380         (self.cbp[self.mb_w + mb_x] & (1 << (5 - blk_no))) != 0
 381     }
 382     pub fn is_coded_top(&self, mb_x: usize, blk_no: usize) -> bool {
 383         let cbp     = self.cbp[self.mb_w + mb_x];
 384         let cbp_top = self.cbp[mb_x];
 385         match blk_no {
 386             0 => { (cbp_top & 0b001000) != 0 },
 387             1 => { (cbp_top & 0b000100) != 0 },
 388             2 => { (cbp     & 0b100000) != 0 },
 389             3 => { (cbp     & 0b010000) != 0 },
 390             4 => { (cbp_top & 0b000010) != 0 },
 391             _ => { (cbp_top & 0b000001) != 0 },
 392         }
 393     }
 394 }
 395