nihav-realmedia/src/codecs/rv20.rs

   1 use nihav_core::io::bitreader::*;
   2 use nihav_core::io::codebook::*;
   3 use nihav_core::formats;
   4 use nihav_core::frame::*;
   5 use nihav_core::codecs::*;
   6 use nihav_codec_support::codecs::{MV, ZIGZAG};
   7 use nihav_codec_support::codecs::blockdsp;
   8 use nihav_codec_support::codecs::h263::*;
   9 use nihav_codec_support::codecs::h263::code::{H263_INTERP_FUNCS, H263_INTERP_AVG_FUNCS, h263_filter_row};
  10 use nihav_codec_support::codecs::h263::decoder::*;
  11 use nihav_codec_support::codecs::h263::data::*;
  12
  13
  14 #[allow(dead_code)]
  15 struct Tables {
  16     intra_mcbpc_cb: Codebook<u8>,
  17     inter_mcbpc_cb: Codebook<u8>,
  18     mbtype_b_cb:    Codebook<u8>,
  19     cbpy_cb:        Codebook<u8>,
  20     cbpc_b_cb:      Codebook<u8>,
  21     rl_cb:          Codebook<H263RLSym>,
  22     aic_rl_cb:      Codebook<H263RLSym>,
  23     mv_cb:          Codebook<u8>,
  24 }
  25
  26 #[derive(Clone,Copy)]
  27 struct RPRInfo {
  28     present:    bool,
  29     bits:       u8,
  30     widths:     [usize; 8],
  31     heights:    [usize; 8],
  32 }
  33
  34 struct RealVideo20Decoder {
  35     info:       NACodecInfoRef,
  36     dec:        H263BaseDecoder,
  37     tables:     Tables,
  38     w:          usize,
  39     h:          usize,
  40     minor_ver:  u8,
  41     rpr:        RPRInfo,
  42     bdsp:       Box<dyn BlockDSP + Send>,
  43     base_ts:    u64,
  44     last_ts:    u16,
  45     next_ts:    u16,
  46 }
  47
  48 struct RealVideo20BR<'a> {
  49     br:         BitReader<'a>,
  50     tables:     &'a Tables,
  51     num_slices: usize,
  52     slice_no:   usize,
  53     slice_off:  Vec<u32>,
  54     w:          usize,
  55     h:          usize,
  56     mb_w:       usize,
  57     mb_h:       usize,
  58     mb_pos_bits: u8,
  59     minor_ver:  u8,
  60     rpr:        RPRInfo,
  61     pts:        u16,
  62 }
  63
  64 struct RV20SliceInfo {
  65     ftype:  Type,
  66     seq:    u32,
  67     qscale: u8,
  68     mb_x:   usize,
  69     mb_y:   usize,
  70     mb_pos: usize,
  71     w:      usize,
  72     h:      usize,
  73 }
  74
  75 #[derive(Default)]
  76 struct RV20BlockDSP {}
  77
  78 impl RV20SliceInfo {
  79     fn new(ftype: Type, seq: u32, qscale: u8, mb_x: usize, mb_y: usize, mb_pos: usize, w: usize, h: usize) -> Self {
  80         RV20SliceInfo { ftype, seq, qscale, mb_x, mb_y, mb_pos, w, h }
  81     }
  82 }
  83
  84 macro_rules! idct {
  85     ($src: expr, $sstep: expr, $dst: expr, $dstep: expr, $bias: expr, $shift: expr, $dtype: tt) => {
  86         let s0 = $src[0]          as i32;
  87         let s1 = $src[$sstep]     as i32;
  88         let s2 = $src[$sstep * 2] as i32;
  89         let s3 = $src[$sstep * 3] as i32;
  90         let s4 = $src[$sstep * 4] as i32;
  91         let s5 = $src[$sstep * 5] as i32;
  92         let s6 = $src[$sstep * 6] as i32;
  93         let s7 = $src[$sstep * 7] as i32;
  94
  95         let t0 = (s0 + s4).wrapping_mul(1448);
  96         let t1 = (s0 - s4).wrapping_mul(1448);
  97         let t2 = s2.wrapping_mul(1892) + s6.wrapping_mul(784);
  98         let t3 = s2.wrapping_mul(784)  - s6.wrapping_mul(1892);
  99         let t4 = s1.wrapping_mul(2009) + s3.wrapping_mul(1703)
 100                + s5.wrapping_mul(1138) + s7.wrapping_mul(400);
 101         let t5 = s1.wrapping_mul(1703) - s3.wrapping_mul(400)
 102                - s5.wrapping_mul(2009) - s7.wrapping_mul(1138);
 103         let t6 = s1.wrapping_mul(1138) - s3.wrapping_mul(2009)
 104                + s5.wrapping_mul(400)  + s7.wrapping_mul(1703);
 105         let t7 = s1.wrapping_mul(400)  - s3.wrapping_mul(1138)
 106                + s5.wrapping_mul(1703) - s7.wrapping_mul(2009);
 107
 108         let t8 = t0 + t2;
 109         let t9 = t0 - t2;
 110         let ta = t1 + t3;
 111         let tb = t1 - t3;
 112
 113         $dst[0]          = ((t8 + t4 + $bias) >> $shift) as $dtype;
 114         $dst[$dstep]     = ((ta + t5 + $bias) >> $shift) as $dtype;
 115         $dst[$dstep * 2] = ((tb + t6 + $bias) >> $shift) as $dtype;
 116         $dst[$dstep * 3] = ((t9 + t7 + $bias) >> $shift) as $dtype;
 117         $dst[$dstep * 4] = ((t9 - t7 + $bias) >> $shift) as $dtype;
 118         $dst[$dstep * 5] = ((tb - t6 + $bias) >> $shift) as $dtype;
 119         $dst[$dstep * 6] = ((ta - t5 + $bias) >> $shift) as $dtype;
 120         $dst[$dstep * 7] = ((t8 - t4 + $bias) >> $shift) as $dtype;
 121     }
 122 }
 123
 124 impl BlockDSP for RV20BlockDSP {
 125     fn idct(&self, blk: &mut [i16; 64]) {
 126         let mut tmp = [0i32; 64];
 127         for (dst, src) in tmp.chunks_mut(8).zip(blk.chunks(8)) {
 128             idct!(src, 1, dst, 1, 0, 4, i32);
 129         }
 130         for i in 0..8 {
 131             idct!(&tmp[i..], 8, &mut blk[i..], 8, 1 << 19, 20, i16);
 132         }
 133     }
 134     fn copy_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: &NAVideoBuffer<u8>, xpos: usize, ypos: usize, w: usize, h: usize, mv: MV) {
 135         let srcx = ((mv.x >> 1) as isize) + (xpos as isize);
 136         let srcy = ((mv.y >> 1) as isize) + (ypos as isize);
 137         let mode = ((mv.x & 1) + (mv.y & 1) * 2) as usize;
 138
 139         blockdsp::copy_blocks(dst, src, xpos, ypos, srcx, srcy, w, h, 0, 1, mode, H263_INTERP_FUNCS);
 140     }
 141     fn avg_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: &NAVideoBuffer<u8>, xpos: usize, ypos: usize, w: usize, h: usize, mv: MV) {
 142         let srcx = ((mv.x >> 1) as isize) + (xpos as isize);
 143         let srcy = ((mv.y >> 1) as isize) + (ypos as isize);
 144         let mode = ((mv.x & 1) + (mv.y & 1) * 2) as usize;
 145
 146         blockdsp::copy_blocks(dst, src, xpos, ypos, srcx, srcy, w, h, 0, 1, mode, H263_INTERP_AVG_FUNCS);
 147     }
 148     fn filter_row(&self, buf: &mut NAVideoBuffer<u8>, mb_y: usize, mb_w: usize, cbpi: &CBPInfo) {
 149         h263_filter_row(buf, mb_y, mb_w, cbpi)
 150     }
 151 }
 152
 153 impl<'a> RealVideo20BR<'a> {
 154     fn new(src: &'a [u8], tables: &'a Tables, width: usize, height: usize, minor_ver: u8, rpr: RPRInfo) -> Self {
 155         let nslices = (src[0] as usize) + 1;
 156         let mut slice_offs = Vec::with_capacity(nslices);
 157         {
 158             let offs = &src[1..][..nslices * 8];
 159             let mut br = BitReader::new(offs, BitReaderMode::BE);
 160             for _ in 0..nslices {
 161                 br.skip(32).unwrap();
 162                 let off = br.read(32).unwrap();
 163                 slice_offs.push(off);
 164             }
 165         }
 166         let soff = nslices * 8 + 1;
 167         let mb_w = (width  + 15) >> 4;
 168         let mb_h = (height + 15) >> 4;
 169         let max_pos = mb_w * mb_h - 1;
 170         let mut mbpb = 0;
 171         for i in 0..H263_MBB.len() {
 172             if max_pos <= H263_MBB[i].blocks {
 173                 mbpb = H263_MBB[i].bits;
 174                 break;
 175             }
 176         }
 177         RealVideo20BR {
 178             br:         BitReader::new(&src[soff..], BitReaderMode::BE),
 179             tables,
 180             num_slices: nslices,
 181             slice_no:   0,
 182             slice_off:  slice_offs,
 183             w:          width,
 184             h:          height,
 185             mb_w,
 186             mb_h,
 187             mb_pos_bits: mbpb,
 188             minor_ver,
 189             rpr,
 190             pts:        0,
 191         }
 192     }
 193
 194 #[allow(unused_variables)]
 195     fn decode_block(&mut self, sstate: &SliceState, quant: u8, intra: bool, coded: bool, blk: &mut [i16; 64], plane_no: usize, acpred: ACPredMode) -> DecoderResult<()> {
 196         let br = &mut self.br;
 197         let mut idx = 0;
 198         if !sstate.is_iframe && intra {
 199             let mut dc = br.read(8)? as i16;
 200             if dc == 255 { dc = 128; }
 201             blk[0] = dc << 3;
 202             idx = 1;
 203         }
 204         if !coded { return Ok(()); }
 205         let scan = match acpred {
 206                     ACPredMode::Hor => H263_SCAN_V,
 207                     ACPredMode::Ver => H263_SCAN_H,
 208                     _               => &ZIGZAG,
 209                 };
 210
 211         let rl_cb = if sstate.is_iframe { &self.tables.aic_rl_cb } else { &self.tables.rl_cb };
 212         let q = if plane_no == 0 { (quant * 2) as i16 } else { (H263_CHROMA_QUANT[quant as usize] * 2) as i16 };
 213         let q_add = if q == 0 || sstate.is_iframe { 0i16 } else { (((q >> 1) - 1) | 1) as i16 };
 214         while idx < 64 {
 215             let code = br.read_cb(rl_cb)?;
 216             let run;
 217             let mut level;
 218             let last;
 219             if !code.is_escape() {
 220                 run   = code.get_run();
 221                 level = code.get_level();
 222                 last  = code.is_last();
 223                 if br.read_bool()? { level = -level; }
 224                 if level >= 0 {
 225                     level = (level * q) + q_add;
 226                 } else {
 227                     level = (level * q) - q_add;
 228                 }
 229             } else {
 230                 last  = br.read_bool()?;
 231                 run   = br.read(6)? as u8;
 232                 level = br.read_s(8)? as i16;
 233                 if level == -128 {
 234                     let low = br.read(5)? as i16;
 235                     let top = br.read_s(6)? as i16;
 236                     level = (top << 5) | low;
 237                 }
 238                 if level >= 0 {
 239                     level = (level * q) + q_add;
 240                 } else {
 241                     level = (level * q) - q_add;
 242                 }
 243                 if level < -2048 { level = -2048; }
 244                 if level >  2047 { level =  2047; }
 245             }
 246             idx += run;
 247             validate!(idx < 64);
 248             let oidx = scan[idx as usize];
 249             blk[oidx] = level;
 250             idx += 1;
 251             if last { break; }
 252         }
 253         Ok(())
 254     }
 255 }
 256
 257 fn decode_mv_component(br: &mut BitReader, mv_cb: &Codebook<u8>) -> DecoderResult<i16> {
 258     let code = br.read_cb(mv_cb)? as i16;
 259     if code == 0 { return Ok(0) }
 260     if !br.read_bool()? {
 261         Ok(code)
 262     } else {
 263         Ok(-code)
 264     }
 265 }
 266
 267 fn decode_mv(br: &mut BitReader, mv_cb: &Codebook<u8>) -> DecoderResult<MV> {
 268     let xval = decode_mv_component(br, mv_cb)?;
 269     let yval = decode_mv_component(br, mv_cb)?;
 270     Ok(MV::new(xval, yval))
 271 }
 272
 273 fn read_dquant(br: &mut BitReader, q: u8) -> DecoderResult<u8> {
 274     if br.read_bool()? {
 275         Ok(H263_MODIFIED_QUANT[br.read(1)? as usize][q as usize])
 276     } else {
 277         Ok(br.read(5)? as u8)
 278     }
 279 }
 280
 281 impl<'a> BlockDecoder for RealVideo20BR<'a> {
 282
 283 #[allow(unused_variables)]
 284     fn decode_pichdr(&mut self) -> DecoderResult<PicInfo> {
 285         self.slice_no = 0;
 286         let shdr = self.read_slice_header()?;
 287 //        self.slice_no += 1;
 288         validate!((shdr.mb_x == 0) && (shdr.mb_y == 0));
 289 /*        let mb_count;
 290         if self.slice_no < self.num_slices {
 291             let pos = self.br.tell();
 292             let shdr2 = self.read_slice_header()?;
 293             self.br.seek(pos as u32)?;
 294             mb_count = shdr2.mb_pos - shdr.mb_pos;
 295         } else {
 296             mb_count = self.mb_w * self.mb_h;
 297         }*/
 298
 299         let plusinfo = Some(PlusInfo::new(shdr.ftype == Type::I, false, false, false));
 300         let picinfo = PicInfo::new(shdr.w, shdr.h, shdr.ftype, MVMode::Long, false, false, shdr.qscale, shdr.seq as u16, None, plusinfo);
 301         Ok(picinfo)
 302     }
 303
 304     #[allow(unused_variables)]
 305     fn decode_slice_header(&mut self, info: &PicInfo) -> DecoderResult<SliceInfo> {
 306         let shdr = self.read_slice_header()?;
 307         self.slice_no += 1;
 308         let mb_count;
 309         if self.slice_no < self.num_slices {
 310             let pos = self.br.tell();
 311             let shdr2 = self.read_slice_header()?;
 312             mb_count = shdr2.mb_pos - shdr.mb_pos;
 313             self.br.seek(pos as u32)?;
 314         } else {
 315             mb_count = self.mb_w * self.mb_h - shdr.mb_pos;
 316         }
 317         let ret = SliceInfo::new(shdr.mb_x, shdr.mb_y, shdr.mb_pos + mb_count, shdr.qscale);
 318
 319         Ok(ret)
 320     }
 321
 322     fn decode_block_header(&mut self, info: &PicInfo, _slice: &SliceInfo, sstate: &SliceState) -> DecoderResult<BlockInfo> {
 323         let br = &mut self.br;
 324         let mut q = sstate.quant;
 325         match info.get_mode() {
 326             Type::I => {
 327                     let mut cbpc = br.read_cb(&self.tables.intra_mcbpc_cb)?;
 328                     while cbpc == 8 { cbpc = br.read_cb(&self.tables.intra_mcbpc_cb)?; }
 329                     let mut acpred = ACPredMode::None;
 330                     if let Some(ref pi) = info.plusinfo {
 331                         if pi.aic {
 332                             let acpp = br.read_bool()?;
 333                             acpred = ACPredMode::DC;
 334                             if acpp {
 335                                 acpred = if br.read_bool()? { ACPredMode::Hor } else { ACPredMode::Ver };
 336                             }
 337                         }
 338                     }
 339                     let cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 340                     let cbp = (cbpy << 2) | (cbpc & 3);
 341                     let dquant = (cbpc & 4) != 0;
 342                     if dquant {
 343                         q = read_dquant(br, q)?;
 344                     }
 345                     let mut binfo = BlockInfo::new(Type::I, cbp, q);
 346                     binfo.set_acpred(acpred);
 347                     Ok(binfo)
 348                 },
 349             Type::P => {
 350                     if br.read_bool()? {
 351                         return Ok(BlockInfo::new(Type::Skip, 0, info.get_quant()));
 352                     }
 353                     let mut cbpc = br.read_cb(&self.tables.inter_mcbpc_cb)?;
 354                     while cbpc == 20 { cbpc = br.read_cb(&self.tables.inter_mcbpc_cb)?; }
 355                     let is_intra = (cbpc & 0x04) != 0;
 356                     let dquant   = (cbpc & 0x08) != 0;
 357                     let is_4x4   = (cbpc & 0x10) != 0;
 358                     if is_intra {
 359                         let cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 360                         let cbp = (cbpy << 2) | (cbpc & 3);
 361                         if dquant {
 362                             q = read_dquant(br, q)?;
 363                         }
 364                         let binfo = BlockInfo::new(Type::I, cbp, q);
 365                         return Ok(binfo);
 366                     }
 367
 368                     let mut cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 369 //                    if /* !aiv && */(cbpc & 3) != 3 {
 370                         cbpy ^= 0xF;
 371 //                    }
 372                     let cbp = (cbpy << 2) | (cbpc & 3);
 373                     if dquant {
 374                         q = read_dquant(br, q)?;
 375                     }
 376                     let mut binfo = BlockInfo::new(Type::P, cbp, q);
 377                     if !is_4x4 {
 378                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 379                         binfo.set_mv(&mvec);
 380                     } else {
 381                         let mvec: [MV; 4] = [
 382                                 decode_mv(br, &self.tables.mv_cb)?,
 383                                 decode_mv(br, &self.tables.mv_cb)?,
 384                                 decode_mv(br, &self.tables.mv_cb)?,
 385                                 decode_mv(br, &self.tables.mv_cb)?
 386                             ];
 387                         binfo.set_mv(&mvec);
 388                     }
 389                     Ok(binfo)
 390                 },
 391             Type::B => { // B
 392                     let mut mbtype = br.read_cb(&self.tables.mbtype_b_cb)? as usize;
 393                     while mbtype == 14 { mbtype = br.read_cb(&self.tables.mbtype_b_cb)? as usize; }
 394
 395                     let is_coded  = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_CODED) != 0;
 396                     let is_intra  = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_INTRA) != 0;
 397                     let dquant    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_DQUANT) != 0;
 398                     let is_fwd    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_FORWARD) != 0;
 399                     let is_bwd    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_BACKWARD) != 0;
 400
 401                     let cbp = if is_coded {
 402                             let cbpc = br.read_cb(&self.tables.cbpc_b_cb)?;
 403                             let mut cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 404                             if !is_intra { cbpy ^= 0xF; }
 405                             (cbpy << 2) | (cbpc & 3)
 406                         } else { 0 };
 407
 408                     if dquant {
 409                         q = read_dquant(br, q)?;
 410                     }
 411
 412                     if is_intra {
 413                         let binfo = BlockInfo::new(Type::I, cbp, q);
 414                         return Ok(binfo);
 415                     }
 416
 417                     let mut binfo = BlockInfo::new(Type::B, cbp, q);
 418                     if is_fwd {
 419                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 420                         binfo.set_mv(&mvec);
 421                     }
 422                     if is_bwd {
 423                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 424                         binfo.set_b_mv(&mvec);
 425                     }
 426                     Ok(binfo)
 427                 },
 428             _ => { unreachable!(); },
 429         }
 430     }
 431
 432     fn decode_block_intra(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()> {
 433         self.decode_block(sstate, quant, true, coded, blk, if no < 4 { 0 } else { no - 3 }, info.get_acpred())
 434     }
 435
 436     #[allow(unused_variables)]
 437     fn decode_block_inter(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()> {
 438         self.decode_block(sstate, quant, false, coded, blk, if no < 4 { 0 } else { no - 3 }, ACPredMode::None)
 439     }
 440
 441     fn is_slice_end(&mut self) -> bool { false }
 442 }
 443
 444 impl<'a> RealVideo20BR<'a> {
 445 #[allow(unused_variables)]
 446     fn read_slice_header(&mut self) -> DecoderResult<RV20SliceInfo> {
 447         validate!(self.slice_no < self.num_slices);
 448
 449         let br = &mut self.br;
 450         br.seek(self.slice_off[self.slice_no] * 8)?;
 451
 452         let frm_type    = br.read(2)?;
 453         let ftype = match frm_type {
 454                 0 | 1 => { Type::I },
 455                 2     => { Type::P },
 456                 _     => { Type::B },
 457             };
 458
 459         let marker      = br.read(1)?;
 460         validate!(marker == 0);
 461         let qscale      = br.read(5)? as u8;
 462         validate!(qscale > 0);
 463         if self.minor_ver >= 2 {
 464             br.skip(1)?; // loop filter
 465         }
 466         let seq = if self.minor_ver <= 1 {
 467                 br.read(8)?  << 8
 468             } else {
 469                 br.read(13)? << 3
 470             };
 471         self.pts = seq as u16;
 472         let w;
 473         let h;
 474         if self.rpr.present {
 475             let rpr = br.read(self.rpr.bits)? as usize;
 476             if rpr == 0 {
 477                 w = self.w;
 478                 h = self.h;
 479             } else {
 480                 w = self.rpr.widths[rpr - 1];
 481                 h = self.rpr.heights[rpr - 1];
 482                 validate!((w != 0) && (h != 0));
 483             }
 484         } else {
 485             w = self.w;
 486             h = self.h;
 487         }
 488
 489         let mb_pos = br.read(self.mb_pos_bits)? as usize;
 490         let mb_x = mb_pos % self.mb_w;
 491         let mb_y = mb_pos / self.mb_w;
 492
 493         br.skip(1)?; // no rounding
 494
 495         if (self.minor_ver <= 1) && (frm_type == 3) {
 496             br.skip(5)?;
 497         }
 498
 499         Ok(RV20SliceInfo::new(ftype, seq, qscale, mb_x, mb_y, mb_pos, w, h))
 500     }
 501 }
 502
 503 impl RealVideo20Decoder {
 504     fn new() -> Self {
 505         let mut coderead = H263ShortCodeReader::new(H263_INTRA_MCBPC);
 506         let intra_mcbpc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 507         let mut coderead = H263ShortCodeReader::new(H263_INTER_MCBPC);
 508         let inter_mcbpc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 509         let mut coderead = H263ShortCodeReader::new(H263_MBTYPE_B);
 510         let mbtype_b_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 511         let mut coderead = H263ShortCodeReader::new(H263_CBPY);
 512         let cbpy_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 513         let mut coderead = H263ShortCodeReader::new(H263_CBPC_B);
 514         let cbpc_b_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 515         let mut coderead = H263RLCodeReader::new(H263_RL_CODES);
 516         let rl_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 517         let mut coderead = H263RLCodeReader::new(H263_RL_CODES_AIC);
 518         let aic_rl_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 519         let mut coderead = H263ShortCodeReader::new(H263_MV);
 520         let mv_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 521
 522         let tables = Tables {
 523             intra_mcbpc_cb,
 524             inter_mcbpc_cb,
 525             mbtype_b_cb,
 526             cbpy_cb,
 527             cbpc_b_cb,
 528             rl_cb,
 529             aic_rl_cb,
 530             mv_cb,
 531         };
 532
 533         RealVideo20Decoder{
 534             info:           NACodecInfoRef::default(),
 535             dec:            H263BaseDecoder::new_b_frames(false),
 536             tables,
 537             w:              0,
 538             h:              0,
 539             minor_ver:      0,
 540             rpr:            RPRInfo { present: false, bits: 0, widths: [0; 8], heights: [0; 8] },
 541             bdsp:           Box::new(RV20BlockDSP::default()),
 542             base_ts:        0,
 543             last_ts:        0,
 544             next_ts:        0,
 545         }
 546     }
 547 }
 548
 549 impl NADecoder for RealVideo20Decoder {
 550 #[allow(unused_variables)]
 551     fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
 552         if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
 553             let w = vinfo.get_width();
 554             let h = vinfo.get_height();
 555             let fmt = formats::YUV420_FORMAT;
 556             let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(w, h, false, fmt));
 557             self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();
 558             self.w = w;
 559             self.h = h;
 560
 561             let edata = info.get_extradata().unwrap();
 562             let src: &[u8] = &edata;
 563             let ver = ((src[4] as u32) << 12) | ((src[5] as u32) << 4) | ((src[6] as u32) >> 4);
 564             let maj_ver = ver >> 16;
 565             let min_ver = (ver >> 8) & 0xFF;
 566             let mic_ver = ver & 0xFF;
 567             validate!(maj_ver == 2);
 568             self.minor_ver = min_ver as u8;
 569             let rprb = src[1] & 7;
 570             if rprb == 0 {
 571                 self.rpr.present = false;
 572             } else {
 573                 self.rpr.present = true;
 574                 self.rpr.bits    = ((rprb >> 1) + 1) as u8;
 575                 for i in 4..(src.len()/2) {
 576                     self.rpr.widths [i - 4] = (src[i * 2]     as usize) * 4;
 577                     self.rpr.heights[i - 4] = (src[i * 2 + 1] as usize) * 4;
 578                 }
 579             }
 580             Ok(())
 581         } else {
 582             Err(DecoderError::InvalidData)
 583         }
 584     }
 585     fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
 586         let src = pkt.get_buffer();
 587
 588         let mut ibr = RealVideo20BR::new(&src, &self.tables, self.w, self.h, self.minor_ver, self.rpr);
 589
 590         let bufinfo = self.dec.parse_frame(&mut ibr, self.bdsp.as_ref())?;
 591
 592         let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), bufinfo);
 593         let ftype = self.dec.get_frame_type();
 594         let pts = ibr.pts;
 595         if ftype != FrameType::B {
 596             self.last_ts = self.next_ts;
 597             self.next_ts = pts;
 598             if self.last_ts > self.next_ts {
 599                 self.base_ts += 1 << 16;
 600             }
 601         }
 602         let ts_diff = self.next_ts.wrapping_sub(pts);
 603         let ts = self.base_ts + (self.next_ts as u64) - (ts_diff as u64);
 604         frm.set_keyframe(self.dec.is_intra());
 605         frm.set_frame_type(ftype);
 606         frm.set_pts(Some(ts >> 3));
 607         Ok(frm.into_ref())
 608     }
 609     fn flush(&mut self) {
 610         self.dec.flush();
 611     }
 612 }
 613
 614 struct MBB { blocks: usize, bits: u8 }
 615 const H263_MBB: &[MBB; 7] = &[
 616     MBB{ blocks:    47, bits:  6 },
 617     MBB{ blocks:    98, bits:  7 },
 618     MBB{ blocks:   395, bits:  9 },
 619     MBB{ blocks:  1583, bits: 11 },
 620     MBB{ blocks:  6335, bits: 13 },
 621     MBB{ blocks:  9215, bits: 14 },
 622     MBB{ blocks: 65536, bits: 14 },
 623 ];
 624
 625 pub fn get_decoder() -> Box<dyn NADecoder + Send> {
 626     Box::new(RealVideo20Decoder::new())
 627 }
 628
 629 #[cfg(test)]
 630 mod test {
 631     use nihav_core::codecs::RegisteredDecoders;
 632     use nihav_core::demuxers::RegisteredDemuxers;
 633     use nihav_codec_support::test::dec_video::*;
 634     use crate::realmedia_register_all_codecs;
 635     use crate::realmedia_register_all_demuxers;
 636     #[test]
 637     fn test_rv20() {
 638         let mut dmx_reg = RegisteredDemuxers::new();
 639         realmedia_register_all_demuxers(&mut dmx_reg);
 640         let mut dec_reg = RegisteredDecoders::new();
 641         realmedia_register_all_codecs(&mut dec_reg);
 642
 643         test_file_decoding("realmedia", "assets/RV/rv20_svt_atrc_640x352_realproducer_plus_8.51.rm", /*None*/Some(3000), true, false, None/*Some("rv20")*/, &dmx_reg, &dec_reg);
 644 //        test_file_decoding("realmedia", "assets/RV/rv20_cook_640x352_realproducer_plus_8.51.rm", /*None*/Some(1000), true, false, Some("rv20"));
 645     }
 646 }