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     loop_filter: bool,
  74 }
  75
  76 #[derive(Default)]
  77 struct RV20BlockDSP {}
  78
  79 impl RV20SliceInfo {
  80     fn new(ftype: Type, seq: u32, qscale: u8, mb_x: usize, mb_y: usize, mb_pos: usize, w: usize, h: usize, loop_filter: bool) -> Self {
  81         RV20SliceInfo { ftype, seq, qscale, mb_x, mb_y, mb_pos, w, h, loop_filter }
  82     }
  83 }
  84
  85 macro_rules! idct {
  86     ($src: expr, $sstep: expr, $dst: expr, $dstep: expr, $bias: expr, $shift: expr, $dtype: tt) => {
  87         let s0 = $src[0]          as i32;
  88         let s1 = $src[$sstep]     as i32;
  89         let s2 = $src[$sstep * 2] as i32;
  90         let s3 = $src[$sstep * 3] as i32;
  91         let s4 = $src[$sstep * 4] as i32;
  92         let s5 = $src[$sstep * 5] as i32;
  93         let s6 = $src[$sstep * 6] as i32;
  94         let s7 = $src[$sstep * 7] as i32;
  95
  96         let t0 = (s0 + s4).wrapping_mul(1448);
  97         let t1 = (s0 - s4).wrapping_mul(1448);
  98         let t2 = s2.wrapping_mul(1892) + s6.wrapping_mul(784);
  99         let t3 = s2.wrapping_mul(784)  - s6.wrapping_mul(1892);
 100         let t4 = s1.wrapping_mul(2009) + s3.wrapping_mul(1703)
 101                + s5.wrapping_mul(1138) + s7.wrapping_mul(400);
 102         let t5 = s1.wrapping_mul(1703) - s3.wrapping_mul(400)
 103                - s5.wrapping_mul(2009) - s7.wrapping_mul(1138);
 104         let t6 = s1.wrapping_mul(1138) - s3.wrapping_mul(2009)
 105                + s5.wrapping_mul(400)  + s7.wrapping_mul(1703);
 106         let t7 = s1.wrapping_mul(400)  - s3.wrapping_mul(1138)
 107                + s5.wrapping_mul(1703) - s7.wrapping_mul(2009);
 108
 109         let t8 = t0 + t2;
 110         let t9 = t0 - t2;
 111         let ta = t1 + t3;
 112         let tb = t1 - t3;
 113
 114         $dst[0]          = ((t8 + t4 + $bias) >> $shift) as $dtype;
 115         $dst[$dstep]     = ((ta + t5 + $bias) >> $shift) as $dtype;
 116         $dst[$dstep * 2] = ((tb + t6 + $bias) >> $shift) as $dtype;
 117         $dst[$dstep * 3] = ((t9 + t7 + $bias) >> $shift) as $dtype;
 118         $dst[$dstep * 4] = ((t9 - t7 + $bias) >> $shift) as $dtype;
 119         $dst[$dstep * 5] = ((tb - t6 + $bias) >> $shift) as $dtype;
 120         $dst[$dstep * 6] = ((ta - t5 + $bias) >> $shift) as $dtype;
 121         $dst[$dstep * 7] = ((t8 - t4 + $bias) >> $shift) as $dtype;
 122     }
 123 }
 124
 125 impl BlockDSP for RV20BlockDSP {
 126     fn idct(&self, blk: &mut [i16; 64]) {
 127         let mut tmp = [0i32; 64];
 128         for (dst, src) in tmp.chunks_mut(8).zip(blk.chunks(8)) {
 129             idct!(src, 1, dst, 1, 0, 4, i32);
 130         }
 131         for i in 0..8 {
 132             idct!(&tmp[i..], 8, &mut blk[i..], 8, 1 << 19, 20, i16);
 133         }
 134     }
 135     fn copy_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mv: MV) {
 136         let mode = ((mv.x & 1) + (mv.y & 1) * 2) as usize;
 137         let cmode = (if (mv.x & 3) != 0 { 1 } else { 0 }) + (if (mv.y & 3) != 0 { 2 } else { 0 });
 138
 139         let mut dst = NASimpleVideoFrame::from_video_buf(dst).unwrap();
 140
 141         blockdsp::copy_block(&mut dst, src.clone(), 0, xpos, ypos, mv.x >> 1, mv.y >> 1, 16, 16, 0, 1, mode, H263_INTERP_FUNCS);
 142         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);
 143         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);
 144     }
 145     fn copy_blocks8x8(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mvs: &[MV; 4]) {
 146         let mut dst = NASimpleVideoFrame::from_video_buf(dst).unwrap();
 147
 148         for i in 0..4 {
 149             let xadd = (i & 1) * 8;
 150             let yadd = (i & 2) * 4;
 151             let mode = ((mvs[i].x & 1) + (mvs[i].y & 1) * 2) as usize;
 152
 153             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);
 154         }
 155
 156         let sum_mv = mvs[0] + mvs[1] + mvs[2] + mvs[3];
 157         let cmx = (sum_mv.x >> 3) + H263_CHROMA_ROUND[(sum_mv.x & 0xF) as usize];
 158         let cmy = (sum_mv.y >> 3) + H263_CHROMA_ROUND[(sum_mv.y & 0xF) as usize];
 159         let mode = ((cmx & 1) + (cmy & 1) * 2) as usize;
 160         for plane in 1..3 {
 161             blockdsp::copy_block(&mut dst, src.clone(), plane, xpos >> 1, ypos >> 1, cmx >> 1, cmy >> 1, 8, 8, 0, 1, mode, H263_INTERP_FUNCS);
 162         }
 163     }
 164     fn avg_blocks(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mv: MV) {
 165         let mode = ((mv.x & 1) + (mv.y & 1) * 2) as usize;
 166         let cmode = (if (mv.x & 3) != 0 { 1 } else { 0 }) + (if (mv.y & 3) != 0 { 2 } else { 0 });
 167
 168         let mut dst = NASimpleVideoFrame::from_video_buf(dst).unwrap();
 169
 170         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);
 171         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);
 172         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);
 173     }
 174     fn avg_blocks8x8(&self, dst: &mut NAVideoBuffer<u8>, src: NAVideoBufferRef<u8>, xpos: usize, ypos: usize, mvs: &[MV; 4]) {
 175         let mut dst = NASimpleVideoFrame::from_video_buf(dst).unwrap();
 176
 177         for i in 0..4 {
 178             let xadd = (i & 1) * 8;
 179             let yadd = (i & 2) * 4;
 180             let mode = ((mvs[i].x & 1) + (mvs[i].y & 1) * 2) as usize;
 181
 182             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);
 183         }
 184
 185         let sum_mv = mvs[0] + mvs[1] + mvs[2] + mvs[3];
 186         let cmx = (sum_mv.x >> 3) + H263_CHROMA_ROUND[(sum_mv.x & 0xF) as usize];
 187         let cmy = (sum_mv.y >> 3) + H263_CHROMA_ROUND[(sum_mv.y & 0xF) as usize];
 188         let mode = ((cmx & 1) + (cmy & 1) * 2) as usize;
 189         for plane in 1..3 {
 190             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);
 191         }
 192     }
 193     fn filter_row(&self, buf: &mut NAVideoBuffer<u8>, mb_y: usize, mb_w: usize, cbpi: &CBPInfo) {
 194         h263_filter_row(buf, mb_y, mb_w, cbpi)
 195     }
 196 }
 197
 198 fn get_mb_pos_bits(mb_w: usize, mb_h: usize) -> u8 {
 199     let max_pos = mb_w * mb_h - 1;
 200     for i in 0..H263_MBB.len() {
 201         if max_pos <= H263_MBB[i].blocks {
 202             return H263_MBB[i].bits;
 203         }
 204     }
 205     0
 206 }
 207
 208 impl<'a> RealVideo20BR<'a> {
 209     fn new(src: &'a [u8], tables: &'a Tables, width: usize, height: usize, minor_ver: u8, rpr: RPRInfo) -> Self {
 210         let nslices = (src[0] as usize) + 1;
 211         let mut slice_offs = Vec::with_capacity(nslices);
 212         {
 213             let offs = &src[1..][..nslices * 8];
 214             let mut br = BitReader::new(offs, BitReaderMode::BE);
 215             for _ in 0..nslices {
 216                 br.skip(32).unwrap();
 217                 let off = br.read(32).unwrap();
 218                 slice_offs.push(off);
 219             }
 220         }
 221         let soff = nslices * 8 + 1;
 222         let mb_w = (width  + 15) >> 4;
 223         let mb_h = (height + 15) >> 4;
 224         RealVideo20BR {
 225             br:         BitReader::new(&src[soff..], BitReaderMode::BE),
 226             tables,
 227             num_slices: nslices,
 228             slice_no:   0,
 229             slice_off:  slice_offs,
 230             w:          width,
 231             h:          height,
 232             mb_w,
 233             mb_h,
 234             mb_pos_bits: get_mb_pos_bits(mb_w, mb_h),
 235             minor_ver,
 236             rpr,
 237             pts:        0,
 238         }
 239     }
 240
 241 #[allow(unused_variables)]
 242     fn decode_block(&mut self, sstate: &SliceState, quant: u8, intra: bool, coded: bool, blk: &mut [i16; 64], plane_no: usize, acpred: ACPredMode) -> DecoderResult<()> {
 243         let br = &mut self.br;
 244         let mut idx = 0;
 245         if !sstate.is_iframe && intra {
 246             let mut dc = br.read(8)? as i16;
 247             if dc == 255 { dc = 128; }
 248             blk[0] = dc << 3;
 249             idx = 1;
 250         }
 251         if !coded { return Ok(()); }
 252         let scan = match acpred {
 253                     ACPredMode::Hor => H263_SCAN_V,
 254                     ACPredMode::Ver => H263_SCAN_H,
 255                     _               => &ZIGZAG,
 256                 };
 257
 258         let rl_cb = if sstate.is_iframe { &self.tables.aic_rl_cb } else { &self.tables.rl_cb };
 259         let q = if plane_no == 0 { (quant * 2) as i16 } else { (H263_CHROMA_QUANT[quant as usize] * 2) as i16 };
 260         let q_add = if q == 0 || sstate.is_iframe { 0i16 } else { (((q >> 1) - 1) | 1) as i16 };
 261         while idx < 64 {
 262             let code = br.read_cb(rl_cb)?;
 263             let run;
 264             let mut level;
 265             let last;
 266             if !code.is_escape() {
 267                 run   = code.get_run();
 268                 level = code.get_level();
 269                 last  = code.is_last();
 270                 if br.read_bool()? { level = -level; }
 271                 if level >= 0 {
 272                     level = (level * q) + q_add;
 273                 } else {
 274                     level = (level * q) - q_add;
 275                 }
 276             } else {
 277                 last  = br.read_bool()?;
 278                 run   = br.read(6)? as u8;
 279                 level = br.read_s(8)? as i16;
 280                 if level == -128 {
 281                     let low = br.read(5)? as i16;
 282                     let top = br.read_s(6)? as i16;
 283                     level = (top << 5) | low;
 284                 }
 285                 if level >= 0 {
 286                     level = (level * q) + q_add;
 287                 } else {
 288                     level = (level * q) - q_add;
 289                 }
 290                 if level < -2048 { level = -2048; }
 291                 if level >  2047 { level =  2047; }
 292             }
 293             idx += run;
 294             validate!(idx < 64);
 295             let oidx = scan[idx as usize];
 296             blk[oidx] = level;
 297             idx += 1;
 298             if last { break; }
 299         }
 300         Ok(())
 301     }
 302 }
 303
 304 fn decode_mv_component(br: &mut BitReader, mv_cb: &Codebook<u8>) -> DecoderResult<i16> {
 305     let code = br.read_cb(mv_cb)? as i16;
 306     if code == 0 { return Ok(0) }
 307     if !br.read_bool()? {
 308         Ok(code)
 309     } else {
 310         Ok(-code)
 311     }
 312 }
 313
 314 fn decode_mv(br: &mut BitReader, mv_cb: &Codebook<u8>) -> DecoderResult<MV> {
 315     let xval = decode_mv_component(br, mv_cb)?;
 316     let yval = decode_mv_component(br, mv_cb)?;
 317     Ok(MV::new(xval, yval))
 318 }
 319
 320 fn read_dquant(br: &mut BitReader, q: u8) -> DecoderResult<u8> {
 321     if br.read_bool()? {
 322         Ok(H263_MODIFIED_QUANT[br.read(1)? as usize][q as usize])
 323     } else {
 324         Ok(br.read(5)? as u8)
 325     }
 326 }
 327
 328 impl<'a> BlockDecoder for RealVideo20BR<'a> {
 329
 330 #[allow(unused_variables)]
 331     fn decode_pichdr(&mut self) -> DecoderResult<PicInfo> {
 332         self.slice_no = 0;
 333         let shdr = self.read_slice_header()?;
 334 //        self.slice_no += 1;
 335         validate!((shdr.mb_x == 0) && (shdr.mb_y == 0));
 336 /*        let mb_count;
 337         if self.slice_no < self.num_slices {
 338             let pos = self.br.tell();
 339             let shdr2 = self.read_slice_header()?;
 340             self.br.seek(pos as u32)?;
 341             mb_count = shdr2.mb_pos - shdr.mb_pos;
 342         } else {
 343             mb_count = self.mb_w * self.mb_h;
 344         }*/
 345
 346         let plusinfo = Some(PlusInfo::new(shdr.ftype == Type::I, shdr.loop_filter, false, false));
 347         let picinfo = PicInfo::new(shdr.w, shdr.h, shdr.ftype, MVMode::Long, false, false, shdr.qscale, shdr.seq as u16, None, plusinfo);
 348         Ok(picinfo)
 349     }
 350
 351     #[allow(unused_variables)]
 352     fn decode_slice_header(&mut self, info: &PicInfo) -> DecoderResult<SliceInfo> {
 353         let shdr = self.read_slice_header()?;
 354         self.slice_no += 1;
 355         let mb_count;
 356         if self.slice_no < self.num_slices {
 357             let pos = self.br.tell();
 358             let shdr2 = self.read_slice_header()?;
 359             validate!(shdr2.mb_pos > shdr.mb_pos);
 360             validate!(shdr2.w == shdr.w && shdr2.h == shdr.h);
 361             mb_count = shdr2.mb_pos - shdr.mb_pos;
 362             self.br.seek(pos as u32)?;
 363         } else {
 364             mb_count = self.mb_w * self.mb_h - shdr.mb_pos;
 365         }
 366         let ret = SliceInfo::new(shdr.mb_x, shdr.mb_y, shdr.mb_pos + mb_count, shdr.qscale);
 367
 368         Ok(ret)
 369     }
 370
 371     fn decode_block_header(&mut self, info: &PicInfo, _slice: &SliceInfo, sstate: &SliceState) -> DecoderResult<BlockInfo> {
 372         let br = &mut self.br;
 373         let mut q = sstate.quant;
 374         match info.get_mode() {
 375             Type::I => {
 376                     let mut cbpc = br.read_cb(&self.tables.intra_mcbpc_cb)?;
 377                     while cbpc == 8 { cbpc = br.read_cb(&self.tables.intra_mcbpc_cb)?; }
 378                     let mut acpred = ACPredMode::None;
 379                     if let Some(ref pi) = info.plusinfo {
 380                         if pi.aic {
 381                             let acpp = br.read_bool()?;
 382                             acpred = ACPredMode::DC;
 383                             if acpp {
 384                                 acpred = if br.read_bool()? { ACPredMode::Hor } else { ACPredMode::Ver };
 385                             }
 386                         }
 387                     }
 388                     let cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 389                     let cbp = (cbpy << 2) | (cbpc & 3);
 390                     let dquant = (cbpc & 4) != 0;
 391                     if dquant {
 392                         q = read_dquant(br, q)?;
 393                     }
 394                     let mut binfo = BlockInfo::new(Type::I, cbp, q);
 395                     binfo.set_acpred(acpred);
 396                     Ok(binfo)
 397                 },
 398             Type::P => {
 399                     if br.read_bool()? {
 400                         return Ok(BlockInfo::new(Type::Skip, 0, info.get_quant()));
 401                     }
 402                     let mut cbpc = br.read_cb(&self.tables.inter_mcbpc_cb)?;
 403                     while cbpc == 20 { cbpc = br.read_cb(&self.tables.inter_mcbpc_cb)?; }
 404                     let is_intra = (cbpc & 0x04) != 0;
 405                     let dquant   = (cbpc & 0x08) != 0;
 406                     let is_4x4   = (cbpc & 0x10) != 0;
 407                     if is_intra {
 408                         let cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 409                         let cbp = (cbpy << 2) | (cbpc & 3);
 410                         if dquant {
 411                             q = read_dquant(br, q)?;
 412                         }
 413                         let binfo = BlockInfo::new(Type::I, cbp, q);
 414                         return Ok(binfo);
 415                     }
 416
 417                     let mut cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 418 //                    if /* !aiv && */(cbpc & 3) != 3 {
 419                         cbpy ^= 0xF;
 420 //                    }
 421                     let cbp = (cbpy << 2) | (cbpc & 3);
 422                     if dquant {
 423                         q = read_dquant(br, q)?;
 424                     }
 425                     let mut binfo = BlockInfo::new(Type::P, cbp, q);
 426                     if !is_4x4 {
 427                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 428                         binfo.set_mv(&mvec);
 429                     } else {
 430                         let mvec: [MV; 4] = [
 431                                 decode_mv(br, &self.tables.mv_cb)?,
 432                                 decode_mv(br, &self.tables.mv_cb)?,
 433                                 decode_mv(br, &self.tables.mv_cb)?,
 434                                 decode_mv(br, &self.tables.mv_cb)?
 435                             ];
 436                         binfo.set_mv(&mvec);
 437                     }
 438                     Ok(binfo)
 439                 },
 440             Type::B => { // B
 441                     let mut mbtype = br.read_cb(&self.tables.mbtype_b_cb)? as usize;
 442                     while mbtype == 14 { mbtype = br.read_cb(&self.tables.mbtype_b_cb)? as usize; }
 443
 444                     let is_coded  = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_CODED) != 0;
 445                     let is_intra  = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_INTRA) != 0;
 446                     let dquant    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_DQUANT) != 0;
 447                     let is_fwd    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_FORWARD) != 0;
 448                     let is_bwd    = (H263_MBTYPE_B_CAPS[mbtype] & H263_MBB_CAP_BACKWARD) != 0;
 449
 450                     let cbp = if is_coded {
 451                             let cbpc = br.read_cb(&self.tables.cbpc_b_cb)?;
 452                             let mut cbpy = br.read_cb(&self.tables.cbpy_cb)?;
 453                             if !is_intra { cbpy ^= 0xF; }
 454                             (cbpy << 2) | (cbpc & 3)
 455                         } else { 0 };
 456
 457                     if dquant {
 458                         q = read_dquant(br, q)?;
 459                     }
 460
 461                     if is_intra {
 462                         let binfo = BlockInfo::new(Type::I, cbp, q);
 463                         return Ok(binfo);
 464                     }
 465
 466                     let mut binfo = BlockInfo::new(Type::B, cbp, q);
 467                     if is_fwd {
 468                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 469                         binfo.set_mv(&mvec);
 470                     }
 471                     if is_bwd {
 472                         let mvec: [MV; 1] = [decode_mv(br, &self.tables.mv_cb)?];
 473                         binfo.set_b_mv(&mvec);
 474                     }
 475                     Ok(binfo)
 476                 },
 477             _ => { unreachable!(); },
 478         }
 479     }
 480
 481     fn decode_block_intra(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()> {
 482         self.decode_block(sstate, quant, true, coded, blk, if no < 4 { 0 } else { no - 3 }, info.get_acpred())
 483     }
 484
 485     #[allow(unused_variables)]
 486     fn decode_block_inter(&mut self, info: &BlockInfo, sstate: &SliceState, quant: u8, no: usize, coded: bool, blk: &mut [i16; 64]) -> DecoderResult<()> {
 487         self.decode_block(sstate, quant, false, coded, blk, if no < 4 { 0 } else { no - 3 }, ACPredMode::None)
 488     }
 489
 490     fn is_slice_end(&mut self) -> bool { false }
 491 }
 492
 493 impl<'a> RealVideo20BR<'a> {
 494 #[allow(unused_variables)]
 495     fn read_slice_header(&mut self) -> DecoderResult<RV20SliceInfo> {
 496         validate!(self.slice_no < self.num_slices);
 497
 498         let br = &mut self.br;
 499         br.seek(self.slice_off[self.slice_no] * 8)?;
 500
 501         let frm_type    = br.read(2)?;
 502         let ftype = match frm_type {
 503                 0 | 1 => { Type::I },
 504                 2     => { Type::P },
 505                 _     => { Type::B },
 506             };
 507
 508         let marker      = br.read(1)?;
 509         validate!(marker == 0);
 510         let qscale      = br.read(5)? as u8;
 511         validate!(qscale > 0);
 512         let loop_filter;
 513         if self.minor_ver >= 2 {
 514             loop_filter = br.read_bool()?;
 515         } else {
 516             loop_filter = false;
 517         }
 518         let seq = if self.minor_ver <= 1 {
 519                 br.read(8)?  << 8
 520             } else {
 521                 br.read(13)? << 3
 522             };
 523         self.pts = seq as u16;
 524         let w;
 525         let h;
 526         if self.rpr.present {
 527             let rpr = br.read(self.rpr.bits)? as usize;
 528             if rpr == 0 {
 529                 w = self.w;
 530                 h = self.h;
 531             } else {
 532                 w = self.rpr.widths[rpr - 1];
 533                 h = self.rpr.heights[rpr - 1];
 534                 validate!((w != 0) && (h != 0));
 535             }
 536             self.mb_w = (w + 15) >> 4;
 537             self.mb_h = (h + 15) >> 4;
 538             self.mb_pos_bits = get_mb_pos_bits(self.mb_w, self.mb_h);
 539         } else {
 540             w = self.w;
 541             h = self.h;
 542         }
 543
 544         let mb_pos = br.read(self.mb_pos_bits)? as usize;
 545         let mb_x = mb_pos % self.mb_w;
 546         let mb_y = mb_pos / self.mb_w;
 547
 548         br.skip(1)?; // no rounding
 549
 550         if (self.minor_ver <= 1) && (frm_type == 3) {
 551             br.skip(5)?;
 552         }
 553
 554         Ok(RV20SliceInfo::new(ftype, seq, qscale, mb_x, mb_y, mb_pos, w, h, loop_filter))
 555     }
 556 }
 557
 558 impl RealVideo20Decoder {
 559     fn new() -> Self {
 560         let mut coderead = H263ShortCodeReader::new(H263_INTRA_MCBPC);
 561         let intra_mcbpc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 562         let mut coderead = H263ShortCodeReader::new(H263_INTER_MCBPC);
 563         let inter_mcbpc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 564         let mut coderead = H263ShortCodeReader::new(H263_MBTYPE_B);
 565         let mbtype_b_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 566         let mut coderead = H263ShortCodeReader::new(H263_CBPY);
 567         let cbpy_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 568         let mut coderead = H263ShortCodeReader::new(H263_CBPC_B);
 569         let cbpc_b_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 570         let mut coderead = H263RLCodeReader::new(H263_RL_CODES);
 571         let rl_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 572         let mut coderead = H263RLCodeReader::new(H263_RL_CODES_AIC);
 573         let aic_rl_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 574         let mut coderead = H263ShortCodeReader::new(H263_MV);
 575         let mv_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 576
 577         let tables = Tables {
 578             intra_mcbpc_cb,
 579             inter_mcbpc_cb,
 580             mbtype_b_cb,
 581             cbpy_cb,
 582             cbpc_b_cb,
 583             rl_cb,
 584             aic_rl_cb,
 585             mv_cb,
 586         };
 587
 588         RealVideo20Decoder{
 589             info:           NACodecInfoRef::default(),
 590             dec:            H263BaseDecoder::new_b_frames(false),
 591             tables,
 592             w:              0,
 593             h:              0,
 594             minor_ver:      0,
 595             rpr:            RPRInfo { present: false, bits: 0, widths: [0; 8], heights: [0; 8] },
 596             bdsp:           Box::new(RV20BlockDSP::default()),
 597             base_ts:        0,
 598             last_ts:        0,
 599             next_ts:        0,
 600         }
 601     }
 602 }
 603
 604 impl NADecoder for RealVideo20Decoder {
 605 #[allow(unused_variables)]
 606     fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
 607         if let NACodecTypeInfo::Video(vinfo) = info.get_properties() {
 608             let w = vinfo.get_width();
 609             let h = vinfo.get_height();
 610             let fmt = formats::YUV420_FORMAT;
 611             let myinfo = NACodecTypeInfo::Video(NAVideoInfo::new(w, h, false, fmt));
 612             self.info = NACodecInfo::new_ref(info.get_name(), myinfo, info.get_extradata()).into_ref();
 613             self.w = w;
 614             self.h = h;
 615
 616             let edata = info.get_extradata().unwrap();
 617             let src: &[u8] = &edata;
 618             let ver = ((src[4] as u32) << 12) | ((src[5] as u32) << 4) | ((src[6] as u32) >> 4);
 619             let maj_ver = ver >> 16;
 620             let min_ver = (ver >> 8) & 0xFF;
 621             let mic_ver = ver & 0xFF;
 622             validate!(maj_ver == 2);
 623             self.minor_ver = min_ver as u8;
 624             let rprb = src[1] & 7;
 625             if rprb == 0 {
 626                 self.rpr.present = false;
 627             } else {
 628                 self.rpr.present = true;
 629                 self.rpr.bits    = ((rprb >> 1) + 1).min(3) as u8;
 630                 let num_dim = ((src.len() - 8) / 2).min(self.rpr.widths.len() - 1);
 631                 for i in 0..num_dim {
 632                     self.rpr.widths [i] = (src[i * 2 + 8] as usize) * 4;
 633                     self.rpr.heights[i] = (src[i * 2 + 9] as usize) * 4;
 634                 }
 635             }
 636             Ok(())
 637         } else {
 638             Err(DecoderError::InvalidData)
 639         }
 640     }
 641     fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
 642         let src = pkt.get_buffer();
 643
 644         let mut ibr = RealVideo20BR::new(&src, &self.tables, self.w, self.h, self.minor_ver, self.rpr);
 645
 646         let bufinfo = self.dec.parse_frame(&mut ibr, self.bdsp.as_ref())?;
 647
 648         let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), bufinfo);
 649         let ftype = self.dec.get_frame_type();
 650         let pts = ibr.pts;
 651         if ftype != FrameType::B {
 652             self.last_ts = self.next_ts;
 653             self.next_ts = pts;
 654             if self.last_ts > self.next_ts {
 655                 self.base_ts += 1 << 16;
 656             }
 657         }
 658         let ts_diff = self.next_ts.wrapping_sub(pts);
 659         let ts = self.base_ts + (self.next_ts as u64) - (ts_diff as u64);
 660         frm.set_keyframe(self.dec.is_intra());
 661         frm.set_frame_type(ftype);
 662         frm.set_pts(Some(ts >> 3));
 663         Ok(frm.into_ref())
 664     }
 665     fn flush(&mut self) {
 666         self.dec.flush();
 667     }
 668 }
 669
 670 impl NAOptionHandler for RealVideo20Decoder {
 671     fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
 672     fn set_options(&mut self, _options: &[NAOption]) { }
 673     fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
 674 }
 675
 676 struct MBB { blocks: usize, bits: u8 }
 677 const H263_MBB: &[MBB; 7] = &[
 678     MBB{ blocks:    47, bits:  6 },
 679     MBB{ blocks:    98, bits:  7 },
 680     MBB{ blocks:   395, bits:  9 },
 681     MBB{ blocks:  1583, bits: 11 },
 682     MBB{ blocks:  6335, bits: 13 },
 683     MBB{ blocks:  9215, bits: 14 },
 684     MBB{ blocks: 65536, bits: 14 },
 685 ];
 686
 687 pub fn get_decoder() -> Box<dyn NADecoder + Send> {
 688     Box::new(RealVideo20Decoder::new())
 689 }
 690
 691 #[cfg(test)]
 692 mod test {
 693     use nihav_core::codecs::RegisteredDecoders;
 694     use nihav_core::demuxers::RegisteredDemuxers;
 695     use nihav_codec_support::test::dec_video::*;
 696     use crate::realmedia_register_all_decoders;
 697     use crate::realmedia_register_all_demuxers;
 698     #[test]
 699     fn test_rv20() {
 700         let mut dmx_reg = RegisteredDemuxers::new();
 701         realmedia_register_all_demuxers(&mut dmx_reg);
 702         let mut dec_reg = RegisteredDecoders::new();
 703         realmedia_register_all_decoders(&mut dec_reg);
 704
 705         test_decoding("realmedia", "realvideo2",
 706                       "assets/RV/rv20_svt_atrc_640x352_realproducer_plus_8.51.rm",
 707                       Some(1000), &dmx_reg, &dec_reg, ExpectedTestResult::MD5Frames(vec![
 708                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 709                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 710                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 711                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 712                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 713                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 714                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 715                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 716                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 717                         [0x8ce88686, 0x03ca3bb9, 0x0d18347b, 0xccdb0bc5],
 718                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 719                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 720                         [0x319d142d, 0x607a7c28, 0x526a2794, 0xa6e7864f],
 721                         [0xa2008d4c, 0xf4684b3a, 0xecd0526c, 0xf0742a77],
 722                         [0x5eef6cfd, 0x4eb49f19, 0x4d760b7a, 0x741ccd0c],
 723                         [0x0e0529df, 0xf1cc3f03, 0x03986b0d, 0xd2033c08],
 724                         [0xdb9aa091, 0xf2c6345c, 0xde9deae8, 0x71f51a67],
 725                         [0x22c978cf, 0x6887a9ba, 0xe74c9316, 0x8cbdd29b],
 726                         [0x7c83c784, 0x15b20881, 0x74798f24, 0x2096573c],
 727                         [0x84a68aed, 0x4cfcefb1, 0x78d1b66b, 0x21b1860a],
 728                         [0x78ed094a, 0x8df72434, 0x58bcd64d, 0x8d725dfd]]));
 729     }
 730 }