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: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mv: MV) {
 135         let mode = ((mv.x & 1) + (mv.y & 1) * 2) as usize;
 136         let cmode = (if (mv.x & 3) != 0 { 1 } else { 0 }) + (if (mv.y & 3) != 0 { 2 } else { 0 });
 137
 138         let mut dst = NASimpleVideoFrame::from_video_buf(dst).unwrap();
 139
 140         blockdsp::copy_block(&mut dst, src.clone(), 0, xpos, ypos, mv.x >> 1, mv.y >> 1, 16, 16, 0, 1, mode, H263_INTERP_FUNCS);
 141         blockdsp::copy_block(&mut dst, src.clone(), 1, xpos >> 1, ypos >> 1, mv.x >> 2, mv.y >> 2, 8, 8, 0, 1, cmode, H263_INTERP_FUNCS);
 142         blockdsp::copy_block(&mut dst, src.clone(), 2, xpos >> 1, ypos >> 1, mv.x >> 2, mv.y >> 2, 8, 8, 0, 1, cmode, H263_INTERP_FUNCS);
 143     }
 144     fn copy_blocks8x8(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mvs: &[MV; 4]) {
 145         let mut dst = NASimpleVideoFrame::from_video_buf(dst).unwrap();
 146
 147         for i in 0..4 {
 148             let xadd = (i & 1) * 8;
 149             let yadd = (i & 2) * 4;
 150             let mode = ((mvs[i].x & 1) + (mvs[i].y & 1) * 2) as usize;
 151
 152             blockdsp::copy_block(&mut dst, src.clone(), 0, xpos + xadd, ypos + yadd, mvs[i].x >> 1, mvs[i].y >> 1, 8, 8, 0, 1, mode, H263_INTERP_FUNCS);
 153         }
 154
 155         let sum_mv = mvs[0] + mvs[1] + mvs[2] + mvs[3];
 156         let cmx = (sum_mv.x >> 3) + H263_CHROMA_ROUND[(sum_mv.x & 0xF) as usize];
 157         let cmy = (sum_mv.y >> 3) + H263_CHROMA_ROUND[(sum_mv.y & 0xF) as usize];
 158         let mode = ((cmx & 1) + (cmy & 1) * 2) as usize;
 159         for plane in 1..3 {
 160             blockdsp::copy_block(&mut dst, src.clone(), plane, xpos >> 1, ypos >> 1, cmx >> 1, cmy >> 1, 8, 8, 0, 1, mode, H263_INTERP_FUNCS);
 161         }
 162     }
 163     fn avg_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mv: MV) {
 164         let mode = ((mv.x & 1) + (mv.y & 1) * 2) as usize;
 165         let cmode = (if (mv.x & 3) != 0 { 1 } else { 0 }) + (if (mv.y & 3) != 0 { 2 } else { 0 });
 166
 167         let mut dst = NASimpleVideoFrame::from_video_buf(dst).unwrap();
 168
 169         blockdsp::copy_block(&mut dst, src.clone(), 0, xpos, ypos, mv.x >> 1, mv.y >> 1, 16, 16, 0, 1, mode, H263_INTERP_AVG_FUNCS);
 170         blockdsp::copy_block(&mut dst, src.clone(), 1, xpos >> 1, ypos >> 1, mv.x >> 2, mv.y >> 2, 8, 8, 0, 1, cmode, H263_INTERP_AVG_FUNCS);
 171         blockdsp::copy_block(&mut dst, src.clone(), 2, xpos >> 1, ypos >> 1, mv.x >> 2, mv.y >> 2, 8, 8, 0, 1, cmode, H263_INTERP_AVG_FUNCS);
 172     }
 173     fn avg_blocks8x8(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mvs: &[MV; 4]) {
 174         let mut dst = NASimpleVideoFrame::from_video_buf(dst).unwrap();
 175
 176         for i in 0..4 {
 177             let xadd = (i & 1) * 8;
 178             let yadd = (i & 2) * 4;
 179             let mode = ((mvs[i].x & 1) + (mvs[i].y & 1) * 2) as usize;
 180
 181             blockdsp::copy_block(&mut dst, src.clone(), 0, xpos + xadd, ypos + yadd, mvs[i].x >> 1, mvs[i].y >> 1, 8, 8, 0, 1, mode, H263_INTERP_AVG_FUNCS);
 182         }
 183
 184         let sum_mv = mvs[0] + mvs[1] + mvs[2] + mvs[3];
 185         let cmx = (sum_mv.x >> 3) + H263_CHROMA_ROUND[(sum_mv.x & 0xF) as usize];
 186         let cmy = (sum_mv.y >> 3) + H263_CHROMA_ROUND[(sum_mv.y & 0xF) as usize];
 187         let mode = ((cmx & 1) + (cmy & 1) * 2) as usize;
 188         for plane in 1..3 {
 189             blockdsp::copy_block(&mut dst, src.clone(), plane, xpos >> 1, ypos >> 1, cmx >> 1, cmy >> 1, 8, 8, 0, 1, mode, H263_INTERP_AVG_FUNCS);
 190         }
 191     }
 192     fn filter_row(&self, buf: &mut NAVideoBuffer<u8>, mb_y: usize, mb_w: usize, cbpi: &CBPInfo) {
 193         h263_filter_row(buf, mb_y, mb_w, cbpi)
 194     }
 195 }
 196
 197 impl<'a> RealVideo20BR<'a> {
 198     fn new(src: &'a [u8], tables: &'a Tables, width: usize, height: usize, minor_ver: u8, rpr: RPRInfo) -> Self {
 199         let nslices = (src[0] as usize) + 1;
 200         let mut slice_offs = Vec::with_capacity(nslices);
 201         {
 202             let offs = &src[1..][..nslices * 8];
 203             let mut br = BitReader::new(offs, BitReaderMode::BE);
 204             for _ in 0..nslices {
 205                 br.skip(32).unwrap();
 206                 let off = br.read(32).unwrap();
 207                 slice_offs.push(off);
 208             }
 209         }
 210         let soff = nslices * 8 + 1;
 211         let mb_w = (width  + 15) >> 4;
 212         let mb_h = (height + 15) >> 4;
 213         let max_pos = mb_w * mb_h - 1;
 214         let mut mbpb = 0;
 215         for i in 0..H263_MBB.len() {
 216             if max_pos <= H263_MBB[i].blocks {
 217                 mbpb = H263_MBB[i].bits;
 218                 break;
 219             }
 220         }
 221         RealVideo20BR {
 222             br:         BitReader::new(&src[soff..], BitReaderMode::BE),
 223             tables,
 224             num_slices: nslices,
 225             slice_no:   0,
 226             slice_off:  slice_offs,
 227             w:          width,
 228             h:          height,
 229             mb_w,
 230             mb_h,
 231             mb_pos_bits: mbpb,
 232             minor_ver,
 233             rpr,
 234             pts:        0,
 235         }
 236     }
 237
 238 #[allow(unused_variables)]
 239     fn decode_block(&mut self, sstate: &SliceState, quant: u8, intra: bool, coded: bool, blk: &mut [i16; 64], plane_no: usize, acpred: ACPredMode) -> DecoderResult<()> {
 240         let br = &mut self.br;
 241         let mut idx = 0;
 242         if !sstate.is_iframe && intra {
 243             let mut dc = br.read(8)? as i16;
 244             if dc == 255 { dc = 128; }
 245             blk[0] = dc << 3;
 246             idx = 1;
 247         }
 248         if !coded { return Ok(()); }
 249         let scan = match acpred {
 250                     ACPredMode::Hor => H263_SCAN_V,
 251                     ACPredMode::Ver => H263_SCAN_H,
 252                     _               => &ZIGZAG,
 253                 };
 254
 255         let rl_cb = if sstate.is_iframe { &self.tables.aic_rl_cb } else { &self.tables.rl_cb };
 256         let q = if plane_no == 0 { (quant * 2) as i16 } else { (H263_CHROMA_QUANT[quant as usize] * 2) as i16 };
 257         let q_add = if q == 0 || sstate.is_iframe { 0i16 } else { (((q >> 1) - 1) | 1) as i16 };
 258         while idx < 64 {
 259             let code = br.read_cb(rl_cb)?;
 260             let run;
 261             let mut level;
 262             let last;
 263             if !code.is_escape() {
 264                 run   = code.get_run();
 265                 level = code.get_level();
 266                 last  = code.is_last();
 267                 if br.read_bool()? { level = -level; }
 268                 if level >= 0 {
 269                     level = (level * q) + q_add;
 270                 } else {
 271                     level = (level * q) - q_add;
 272                 }
 273             } else {
 274                 last  = br.read_bool()?;
 275                 run   = br.read(6)? as u8;
 276                 level = br.read_s(8)? as i16;
 277                 if level == -128 {
 278                     let low = br.read(5)? as i16;
 279                     let top = br.read_s(6)? as i16;
 280                     level = (top << 5) | low;
 281                 }
 282                 if level >= 0 {
 283                     level = (level * q) + q_add;
 284                 } else {
 285                     level = (level * q) - q_add;
 286                 }
 287                 if level < -2048 { level = -2048; }
 288                 if level >  2047 { level =  2047; }
 289             }
 290             idx += run;
 291             validate!(idx < 64);
 292             let oidx = scan[idx as usize];
 293             blk[oidx] = level;
 294             idx += 1;
 295             if last { break; }
 296         }
 297         Ok(())
 298     }
 299 }
 300
 301 fn decode_mv_component(br: &mut BitReader, mv_cb: &Codebook<u8>) -> DecoderResult<i16> {
 302     let code = br.read_cb(mv_cb)? as i16;
 303     if code == 0 { return Ok(0) }
 304     if !br.read_bool()? {
 305         Ok(code)
 306     } else {
 307         Ok(-code)
 308     }
 309 }
 310
 311 fn decode_mv(br: &mut BitReader, mv_cb: &Codebook<u8>) -> DecoderResult<MV> {
 312     let xval = decode_mv_component(br, mv_cb)?;
 313     let yval = decode_mv_component(br, mv_cb)?;
 314     Ok(MV::new(xval, yval))
 315 }
 316
 317 fn read_dquant(br: &mut BitReader, q: u8) -> DecoderResult<u8> {
 318     if br.read_bool()? {
 319         Ok(H263_MODIFIED_QUANT[br.read(1)? as usize][q as usize])
 320     } else {
 321         Ok(br.read(5)? as u8)
 322     }
 323 }
 324
 325 impl<'a> BlockDecoder for RealVideo20BR<'a> {
 326
 327 #[allow(unused_variables)]
 328     fn decode_pichdr(&mut self) -> DecoderResult<PicInfo> {
 329         self.slice_no = 0;
 330         let shdr = self.read_slice_header()?;
 331 //        self.slice_no += 1;
 332         validate!((shdr.mb_x == 0) && (shdr.mb_y == 0));
 333 /*        let mb_count;
 334         if self.slice_no < self.num_slices {
 335             let pos = self.br.tell();
 336             let shdr2 = self.read_slice_header()?;
 337             self.br.seek(pos as u32)?;
 338             mb_count = shdr2.mb_pos - shdr.mb_pos;
 339         } else {
 340             mb_count = self.mb_w * self.mb_h;
 341         }*/
 342
 343         let plusinfo = Some(PlusInfo::new(shdr.ftype == Type::I, false, false, false));
 344         let picinfo = PicInfo::new(shdr.w, shdr.h, shdr.ftype, MVMode::Long, false, false, shdr.qscale, shdr.seq as u16, None, plusinfo);
 345         Ok(picinfo)
 346     }
 347
 348     #[allow(unused_variables)]
 349     fn decode_slice_header(&mut self, info: &PicInfo) -> DecoderResult<SliceInfo> {
 350         let shdr = self.read_slice_header()?;
 351         self.slice_no += 1;
 352         let mb_count;
 353         if self.slice_no < self.num_slices {
 354             let pos = self.br.tell();
 355             let shdr2 = self.read_slice_header()?;
 356             validate!(shdr2.mb_pos > shdr.mb_pos);
 357             mb_count = shdr2.mb_pos - shdr.mb_pos;
 358             self.br.seek(pos as u32)?;
 359         } else {
 360             mb_count = self.mb_w * self.mb_h - shdr.mb_pos;
 361         }
 362         let ret = SliceInfo::new(shdr.mb_x, shdr.mb_y, shdr.mb_pos + mb_count, shdr.qscale);
 363
 364         Ok(ret)
 365     }
 366
 367     fn decode_block_header(&mut self, info: &PicInfo, _slice: &SliceInfo, sstate: &SliceState) -> DecoderResult<BlockInfo> {
 368         let br = &mut self.br;
 369         let mut q = sstate.quant;
 370         match info.get_mode() {
 371             Type::I => {
 372                     let mut cbpc = br.read_cb(&self.tables.intra_mcbpc_cb)?;
 373                     while cbpc == 8 { cbpc = br.read_cb(&self.tables.intra_mcbpc_cb)?; }
 374                     let mut acpred = ACPredMode::None;
 375                     if let Some(ref pi) = info.plusinfo {
 376                         if pi.aic {
 377                             let acpp = br.read_bool()?;
 378                             acpred = ACPredMode::DC;
 379                             if acpp {
 380                                 acpred = if br.read_bool()? { ACPredMode::Hor } else { ACPredMode::Ver };
 381                             }
 382                         }
 383                     }
 384                     let cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 385                     let cbp = (cbpy << 2) | (cbpc & 3);
 386                     let dquant = (cbpc & 4) != 0;
 387                     if dquant {
 388                         q = read_dquant(br, q)?;
 389                     }
 390                     let mut binfo = BlockInfo::new(Type::I, cbp, q);
 391                     binfo.set_acpred(acpred);
 392                     Ok(binfo)
 393                 },
 394             Type::P => {
 395                     if br.read_bool()? {
 396                         return Ok(BlockInfo::new(Type::Skip, 0, info.get_quant()));
 397                     }
 398                     let mut cbpc = br.read_cb(&self.tables.inter_mcbpc_cb)?;
 399                     while cbpc == 20 { cbpc = br.read_cb(&self.tables.inter_mcbpc_cb)?; }
 400                     let is_intra = (cbpc & 0x04) != 0;
 401                     let dquant   = (cbpc & 0x08) != 0;
 402                     let is_4x4   = (cbpc & 0x10) != 0;
 403                     if is_intra {
 404                         let cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 405                         let cbp = (cbpy << 2) | (cbpc & 3);
 406                         if dquant {
 407                             q = read_dquant(br, q)?;
 408                         }
 409                         let binfo = BlockInfo::new(Type::I, cbp, q);
 410                         return Ok(binfo);
 411                     }
 412
 413                     let mut cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 414 //                    if /* !aiv && */(cbpc & 3) != 3 {
 415                         cbpy ^= 0xF;
 416 //                    }
 417                     let cbp = (cbpy << 2) | (cbpc & 3);
 418                     if dquant {
 419                         q = read_dquant(br, q)?;
 420                     }
 421                     let mut binfo = BlockInfo::new(Type::P, cbp, q);
 422                     if !is_4x4 {
 423                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 424                         binfo.set_mv(&mvec);
 425                     } else {
 426                         let mvec: [MV; 4] = [
 427                                 decode_mv(br, &self.tables.mv_cb)?,
 428                                 decode_mv(br, &self.tables.mv_cb)?,
 429                                 decode_mv(br, &self.tables.mv_cb)?,
 430                                 decode_mv(br, &self.tables.mv_cb)?
 431                             ];
 432                         binfo.set_mv(&mvec);
 433                     }
 434                     Ok(binfo)
 435                 },
 436             Type::B => { // B
 437                     let mut mbtype = br.read_cb(&self.tables.mbtype_b_cb)? as usize;
 438                     while mbtype == 14 { mbtype = br.read_cb(&self.tables.mbtype_b_cb)? as usize; }
 439
 440                     let is_coded  = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_CODED) != 0;
 441                     let is_intra  = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_INTRA) != 0;
 442                     let dquant    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_DQUANT) != 0;
 443                     let is_fwd    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_FORWARD) != 0;
 444                     let is_bwd    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_BACKWARD) != 0;
 445
 446                     let cbp = if is_coded {
 447                             let cbpc = br.read_cb(&self.tables.cbpc_b_cb)?;
 448                             let mut cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 449                             if !is_intra { cbpy ^= 0xF; }
 450                             (cbpy << 2) | (cbpc & 3)
 451                         } else { 0 };
 452
 453                     if dquant {
 454                         q = read_dquant(br, q)?;
 455                     }
 456
 457                     if is_intra {
 458                         let binfo = BlockInfo::new(Type::I, cbp, q);
 459                         return Ok(binfo);
 460                     }
 461
 462                     let mut binfo = BlockInfo::new(Type::B, cbp, q);
 463                     if is_fwd {
 464                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 465                         binfo.set_mv(&mvec);
 466                     }
 467                     if is_bwd {
 468                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 469                         binfo.set_b_mv(&mvec);
 470                     }
 471                     Ok(binfo)
 472                 },
 473             _ => { unreachable!(); },
 474         }
 475     }
 476
 477     fn decode_block_intra(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()> {
 478         self.decode_block(sstate, quant, true, coded, blk, if no < 4 { 0 } else { no - 3 }, info.get_acpred())
 479     }
 480
 481     #[allow(unused_variables)]
 482     fn decode_block_inter(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()> {
 483         self.decode_block(sstate, quant, false, coded, blk, if no < 4 { 0 } else { no - 3 }, ACPredMode::None)
 484     }
 485
 486     fn is_slice_end(&mut self) -> bool { false }
 487 }
 488
 489 impl<'a> RealVideo20BR<'a> {
 490 #[allow(unused_variables)]
 491     fn read_slice_header(&mut self) -> DecoderResult<RV20SliceInfo> {
 492         validate!(self.slice_no < self.num_slices);
 493
 494         let br = &mut self.br;
 495         br.seek(self.slice_off[self.slice_no] * 8)?;
 496
 497         let frm_type    = br.read(2)?;
 498         let ftype = match frm_type {
 499                 0 | 1 => { Type::I },
 500                 2     => { Type::P },
 501                 _     => { Type::B },
 502             };
 503
 504         let marker      = br.read(1)?;
 505         validate!(marker == 0);
 506         let qscale      = br.read(5)? as u8;
 507         validate!(qscale > 0);
 508         if self.minor_ver >= 2 {
 509             br.skip(1)?; // loop filter
 510         }
 511         let seq = if self.minor_ver <= 1 {
 512                 br.read(8)?  << 8
 513             } else {
 514                 br.read(13)? << 3
 515             };
 516         self.pts = seq as u16;
 517         let w;
 518         let h;
 519         if self.rpr.present {
 520             let rpr = br.read(self.rpr.bits)? as usize;
 521             if rpr == 0 {
 522                 w = self.w;
 523                 h = self.h;
 524             } else {
 525                 w = self.rpr.widths[rpr - 1];
 526                 h = self.rpr.heights[rpr - 1];
 527                 validate!((w != 0) && (h != 0));
 528             }
 529         } else {
 530             w = self.w;
 531             h = self.h;
 532         }
 533
 534         let mb_pos = br.read(self.mb_pos_bits)? as usize;
 535         let mb_x = mb_pos % self.mb_w;
 536         let mb_y = mb_pos / self.mb_w;
 537
 538         br.skip(1)?; // no rounding
 539
 540         if (self.minor_ver <= 1) && (frm_type == 3) {
 541             br.skip(5)?;
 542         }
 543
 544         Ok(RV20SliceInfo::new(ftype, seq, qscale, mb_x, mb_y, mb_pos, w, h))
 545     }
 546 }
 547
 548 impl RealVideo20Decoder {
 549     fn new() -> Self {
 550         let mut coderead = H263ShortCodeReader::new(H263_INTRA_MCBPC);
 551         let intra_mcbpc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 552         let mut coderead = H263ShortCodeReader::new(H263_INTER_MCBPC);
 553         let inter_mcbpc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 554         let mut coderead = H263ShortCodeReader::new(H263_MBTYPE_B);
 555         let mbtype_b_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 556         let mut coderead = H263ShortCodeReader::new(H263_CBPY);
 557         let cbpy_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 558         let mut coderead = H263ShortCodeReader::new(H263_CBPC_B);
 559         let cbpc_b_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 560         let mut coderead = H263RLCodeReader::new(H263_RL_CODES);
 561         let rl_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 562         let mut coderead = H263RLCodeReader::new(H263_RL_CODES_AIC);
 563         let aic_rl_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 564         let mut coderead = H263ShortCodeReader::new(H263_MV);
 565         let mv_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 566
 567         let tables = Tables {
 568             intra_mcbpc_cb,
 569             inter_mcbpc_cb,
 570             mbtype_b_cb,
 571             cbpy_cb,
 572             cbpc_b_cb,
 573             rl_cb,
 574             aic_rl_cb,
 575             mv_cb,
 576         };
 577
 578         RealVideo20Decoder{
 579             info:           NACodecInfoRef::default(),
 580             dec:            H263BaseDecoder::new_b_frames(false),
 581             tables,
 582             w:              0,
 583             h:              0,
 584             minor_ver:      0,
 585             rpr:            RPRInfo { present: false, bits: 0, widths: [0; 8], heights: [0; 8] },
 586             bdsp:           Box::new(RV20BlockDSP::default()),
 587             base_ts:        0,
 588             last_ts:        0,
 589             next_ts:        0,
 590         }
 591     }
 592 }
 593
 594 impl NADecoder for RealVideo20Decoder {
 595 #[allow(unused_variables)]
 596     fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
 597         if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
 598             let w = vinfo.get_width();
 599             let h = vinfo.get_height();
 600             let fmt = formats::YUV420_FORMAT;
 601             let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(w, h, false, fmt));
 602             self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();
 603             self.w = w;
 604             self.h = h;
 605
 606             let edata = info.get_extradata().unwrap();
 607             let src: &[u8] = &edata;
 608             let ver = ((src[4] as u32) << 12) | ((src[5] as u32) << 4) | ((src[6] as u32) >> 4);
 609             let maj_ver = ver >> 16;
 610             let min_ver = (ver >> 8) & 0xFF;
 611             let mic_ver = ver & 0xFF;
 612             validate!(maj_ver == 2);
 613             self.minor_ver = min_ver as u8;
 614             let rprb = src[1] & 7;
 615             if rprb == 0 {
 616                 self.rpr.present = false;
 617             } else {
 618                 self.rpr.present = true;
 619                 self.rpr.bits    = ((rprb >> 1) + 1) as u8;
 620                 for i in 4..(src.len()/2) {
 621                     self.rpr.widths [i - 4] = (src[i * 2]     as usize) * 4;
 622                     self.rpr.heights[i - 4] = (src[i * 2 + 1] as usize) * 4;
 623                 }
 624             }
 625             Ok(())
 626         } else {
 627             Err(DecoderError::InvalidData)
 628         }
 629     }
 630     fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
 631         let src = pkt.get_buffer();
 632
 633         let mut ibr = RealVideo20BR::new(&src, &self.tables, self.w, self.h, self.minor_ver, self.rpr);
 634
 635         let bufinfo = self.dec.parse_frame(&mut ibr, self.bdsp.as_ref())?;
 636
 637         let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), bufinfo);
 638         let ftype = self.dec.get_frame_type();
 639         let pts = ibr.pts;
 640         if ftype != FrameType::B {
 641             self.last_ts = self.next_ts;
 642             self.next_ts = pts;
 643             if self.last_ts > self.next_ts {
 644                 self.base_ts += 1 << 16;
 645             }
 646         }
 647         let ts_diff = self.next_ts.wrapping_sub(pts);
 648         let ts = self.base_ts + (self.next_ts as u64) - (ts_diff as u64);
 649         frm.set_keyframe(self.dec.is_intra());
 650         frm.set_frame_type(ftype);
 651         frm.set_pts(Some(ts >> 3));
 652         Ok(frm.into_ref())
 653     }
 654     fn flush(&mut self) {
 655         self.dec.flush();
 656     }
 657 }
 658
 659 struct MBB { blocks: usize, bits: u8 }
 660 const H263_MBB: &[MBB; 7] = &[
 661     MBB{ blocks:    47, bits:  6 },
 662     MBB{ blocks:    98, bits:  7 },
 663     MBB{ blocks:   395, bits:  9 },
 664     MBB{ blocks:  1583, bits: 11 },
 665     MBB{ blocks:  6335, bits: 13 },
 666     MBB{ blocks:  9215, bits: 14 },
 667     MBB{ blocks: 65536, bits: 14 },
 668 ];
 669
 670 pub fn get_decoder() -> Box<dyn NADecoder + Send> {
 671     Box::new(RealVideo20Decoder::new())
 672 }
 673
 674 #[cfg(test)]
 675 mod test {
 676     use nihav_core::codecs::RegisteredDecoders;
 677     use nihav_core::demuxers::RegisteredDemuxers;
 678     use nihav_codec_support::test::dec_video::*;
 679     use crate::realmedia_register_all_codecs;
 680     use crate::realmedia_register_all_demuxers;
 681     #[test]
 682     fn test_rv20() {
 683         let mut dmx_reg = RegisteredDemuxers::new();
 684         realmedia_register_all_demuxers(&mut dmx_reg);
 685         let mut dec_reg = RegisteredDecoders::new();
 686         realmedia_register_all_codecs(&mut dec_reg);
 687
 688         test_decoding("realmedia", "realvideo2",
 689                       "assets/RV/rv20_svt_atrc_640x352_realproducer_plus_8.51.rm",
 690                       Some(1000), &dmx_reg, &dec_reg, ExpectedTestResult::MD5Frames(vec![
 691                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 692                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 693                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 694                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 695                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 696                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 697                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 698                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 699                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 700                         [0x8ce88686, 0x03ca3bb9, 0x0d18347b, 0xccdb0bc5],
 701                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 702                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 703                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 704                         [0xa2008d4c, 0xf4684b3a, 0xecd0526c, 0xf0742a77],
 705                         [0xafe0df5b, 0x29cd2418, 0x29a265c7, 0x9b4f2218],
 706                         [0x0e0529df, 0xf1cc3f03, 0x03986b0d, 0xd2033c08],
 707                         [0x4662b5ab, 0xaca5ca35, 0x4d089fb2, 0xc6a3df1e],
 708                         [0x22c978cf, 0x6887a9ba, 0xe74c9316, 0x8cbdd29b],
 709                         [0x12d8b88f, 0x59ebe632, 0xbcfaa336, 0xadbdd9ad],
 710                         [0x0d99c67b, 0x3231302f, 0x3612b0d0, 0x38b5414d],
 711                         [0x2f65b75e, 0x1239d563, 0x832ce096, 0x568a9bc2]]));
 712     }
 713 }