nihav-commonfmt/src/codecs/atrac3.rs

   1 use nihav_core::formats::*;
   2 use nihav_core::frame::*;
   3 use nihav_core::codecs::*;
   4 use nihav_core::io::bitreader::*;
   5 use nihav_core::io::byteio::*;
   6 use nihav_core::io::codebook::*;
   7 use nihav_codec_support::dsp::mdct::IMDCT;
   8 use std::f32::consts;
   9
  10 #[derive(Clone,Copy,PartialEq)]
  11 enum Mode {
  12     Mono,
  13     Stereo,
  14     JointStereo,
  15 }
  16
  17 const ATRAC3_FRAME_SIZE: usize = 1024;
  18
  19 #[derive(Clone,Copy)]
  20 struct Tone {
  21     pos:        usize,
  22     ncoeffs:    usize,
  23     coeffs:     [f32; 8],
  24 }
  25
  26 struct GainData {
  27     ngains:     [usize; 4],
  28     gain_lev:   [[usize; 8]; 4],
  29     gain_loc:   [[usize; 8]; 4],
  30 }
  31
  32 impl GainData {
  33     fn new() -> Self {
  34         Self {
  35             ngains:     [0; 4],
  36             gain_lev:   [[0; 8]; 4],
  37             gain_loc:   [[0; 8]; 4],
  38         }
  39     }
  40     fn read(&mut self, br: &mut BitReader, bands: usize) -> DecoderResult<()> {
  41         self.ngains = [0; 4];
  42         for band in 0..bands {
  43             self.ngains[band]                           = br.read(3)? as usize;
  44             for i in 0..self.ngains[band] {
  45                 self.gain_lev[band][i]                  = br.read(4)? as usize;
  46                 self.gain_loc[band][i]                  = br.read(5)? as usize;
  47             }
  48         }
  49         Ok(())
  50     }
  51 }
  52
  53 struct Channel {
  54     data:       [f32; ATRAC3_FRAME_SIZE],
  55     delay:      [f32; ATRAC3_FRAME_SIZE],
  56     qmf_delay:  [f32; 64 * 3],
  57
  58     bands:      usize,
  59     block_no:   usize,
  60
  61     gain_data:  [GainData; 2],
  62
  63     subbands:   usize,
  64     components: usize,
  65     ntones:     usize,
  66     tones:      [Tone; 64],
  67 }
  68
  69 impl Channel {
  70     fn new() -> Self {
  71         Self {
  72             data:       [0.0; ATRAC3_FRAME_SIZE],
  73             delay:      [0.0; ATRAC3_FRAME_SIZE],
  74             qmf_delay:  [0.0; 64 * 3],
  75
  76             bands:      0,
  77             block_no:   0,
  78
  79             gain_data:  [GainData::new(), GainData::new()],
  80
  81             subbands:   0,
  82             components: 0,
  83             ntones:     0,
  84             tones:      [Tone {pos: 0, ncoeffs: 0, coeffs: [0.0; 8]}; 64],
  85         }
  86     }
  87     fn decode_unit(&mut self, br: &mut BitReader, codebooks: &[Codebook<u8>; 7], scalefactors: &[f32; 64]) -> DecoderResult<()> {
  88         self.bands                                      = (br.read(2)? as usize) + 1;
  89         self.gain_data[self.block_no].read(br, self.bands)?;
  90         self.data = [0.0; ATRAC3_FRAME_SIZE];
  91
  92         self.ntones = 0;
  93         self.components                                 = br.read(5)? as usize;
  94         if self.components > 0 {
  95             let selector                                = br.read(2)?;
  96             validate!(selector != 2);
  97             let mut mode0 = (selector & 1) != 0;
  98
  99             for _ in 0..self.components {
 100                 let mut flags: [bool; 4] = [false; 4];
 101                 for band in 0..self.bands {
 102                     flags[band]                         = br.read_bool()?;
 103                 }
 104                 let nvals                               = br.read(3)? as usize;
 105                 let quant                               = br.read(3)? as usize;
 106                 validate!(quant > 1);
 107                 if selector == 3 {
 108                     mode0                               = br.read_bool()?;
 109                 }
 110                 for j in 0..self.bands*4 {
 111                     if !flags[j >> 2] { continue; }
 112                     let count                           = br.read(3)? as usize;
 113                     validate!(self.ntones + count < 64);
 114                     for _ in 0..count {
 115                         let scale_idx                   = br.read(6)? as usize;
 116                         let tone = &mut self.tones[self.ntones];
 117                         tone.pos                        = (br.read(6)? as usize) + j * 64;
 118                         tone.ncoeffs                    = (ATRAC3_FRAME_SIZE - tone.pos).min(nvals + 1);
 119                         let scale = scalefactors[scale_idx] * ATRAC3_MAX_QUANT[quant];
 120                         read_coeffs(br, codebooks, &mut tone.coeffs[..tone.ncoeffs], quant, scale, mode0)?;
 121                         self.ntones += 1;
 122                     }
 123                 }
 124             }
 125         }
 126
 127         // spectrum
 128         let mut quants: [usize; 32] = [0; 32];
 129         let mut scf:    [usize; 32] = [0; 32];
 130         self.subbands                                   = (br.read(5)? as usize) + 1;
 131         let mode0                                       = br.read_bool()?;
 132         for i in 0..self.subbands {
 133             quants[i]                                   = br.read(3)? as usize;
 134         }
 135         for i in 0..self.subbands {
 136             if quants[i] == 0 { continue; }
 137             scf[i]                                      = br.read(6)? as usize;
 138         }
 139
 140         self.data = [0.0; ATRAC3_FRAME_SIZE];
 141         for i in 0..self.subbands {
 142             if quants[i] == 0 { continue; }
 143             let start = ATRAC3_SUBBANDS[i];
 144             let end   = ATRAC3_SUBBANDS[i + 1];
 145             let scale = scalefactors[scf[i]] * ATRAC3_MAX_QUANT[quants[i]];
 146             read_coeffs(br, codebooks, &mut self.data[start..end], quants[i], scale, mode0)?;
 147         }
 148
 149         for i in 0..self.ntones {
 150             let tone = &self.tones[i];
 151             for j in 0..tone.ncoeffs {
 152                 self.data[tone.pos + j] += tone.coeffs[j];
 153             }
 154         }
 155         Ok(())
 156     }
 157     fn synth(&mut self, dsp: &mut DSP) {
 158         let mut flag = 0;
 159         for (band, (data, delay)) in self.data.chunks_mut(256).zip(self.delay.chunks_mut(256)).enumerate() {
 160             if (flag & 1) != 0 {
 161                 for i in 0..128 {
 162                     let t0 = data[i];
 163                     let t1 = data[255 - i];
 164                     data[i]         = t1;
 165                     data[255 - i]   = t0;
 166                 }
 167             }
 168             dsp.synth_band(data);
 169             dsp.apply_gains(data, delay, &mut self.gain_data, self.block_no, band);
 170             delay.copy_from_slice(&dsp.tmp[256..512]);
 171             flag ^= 1;
 172         }
 173         self.block_no ^= 1;
 174     }
 175     fn do_qmf(&mut self, dsp: &mut DSP, dst: &mut [f32]) {
 176         let mut qchunks = self.qmf_delay.chunks_mut(64);
 177         let qmf0 = qchunks.next().unwrap();
 178         let qmf1 = qchunks.next().unwrap();
 179         let qmf2 = qchunks.next().unwrap();
 180         {
 181             let mut tchunks = self.data.chunks_mut(512);
 182             let tmp0 = tchunks.next().unwrap();
 183             let tmp1 = tchunks.next().unwrap();
 184             dsp.do_qmf(tmp0, qmf0, false);
 185             dsp.do_qmf(tmp1, qmf1, true);
 186         }
 187         dsp.do_qmf_out(dst, &self.data, qmf2);
 188     }
 189 }
 190
 191 const ATRAC3_DEFAULT_DELAY: usize = 2190;
 192 const ATRAC3_WEIGHTING_DELAYS: [u8; 6] = [ 0, 7, 0, 7, 0, 7 ];
 193
 194 fn read_coeffs(br: &mut BitReader, cb: &[Codebook<u8>; 7], dst: &mut [f32], quant: usize, scale: f32, mode0: bool) -> DecoderResult<()> {
 195     if mode0 {
 196         read_coeffs_mode0(br, dst, quant, scale)
 197     } else if quant == 1 {
 198         read_coeffs_mode1(br, &cb[0], dst, scale)
 199     } else {
 200         read_coeffs_other(br, &cb[quant - 1], dst, scale)
 201     }
 202 }
 203
 204 const ATRAC3_MODE0_CB: [f32; 4] = [ 0.0, 1.0, -2.0, -1.0 ];
 205 const ATRAC3_MODE0_BITS: [u8; 8] = [ 0, 4, 3, 3, 4, 4, 5, 6 ];
 206
 207 fn read_coeffs_mode0(br: &mut BitReader, dst: &mut [f32], quant: usize, scale: f32) -> DecoderResult<()> {
 208     let bits = ATRAC3_MODE0_BITS[quant];
 209     if bits > 0 {
 210         for el in dst.iter_mut() {
 211             let val                                     = br.read_s(bits)? as f32;
 212             *el = val * scale;
 213         }
 214     } else {
 215         for out in dst.chunks_mut(2) {
 216             let val                                     = br.read(4)? as usize;
 217             out[0] = ATRAC3_MODE0_CB[val >> 2] * scale;
 218             out[1] = ATRAC3_MODE0_CB[val &  3] * scale;
 219         }
 220     }
 221     Ok(())
 222 }
 223
 224 const ATRAC3_MODE1_CB: [f32; 9 * 2] = [
 225      0.0,  0.0,
 226      0.0,  1.0,
 227      0.0, -1.0,
 228      1.0,  0.0,
 229     -1.0,  0.0,
 230      1.0,  1.0,
 231      1.0, -1.0,
 232     -1.0,  1.0,
 233     -1.0, -1.0
 234 ];
 235
 236 fn read_coeffs_mode1(br: &mut BitReader, cb: &Codebook<u8>, dst: &mut [f32], scale: f32) -> DecoderResult<()> {
 237     for out in dst.chunks_mut(2) {
 238         let val                                         = br.read_cb(cb)? as usize;
 239         out[0] = ATRAC3_MODE1_CB[val * 2 + 0] * scale;
 240         out[1] = ATRAC3_MODE1_CB[val * 2 + 1] * scale;
 241     }
 242     Ok(())
 243 }
 244
 245 fn read_coeffs_other(br: &mut BitReader, cb: &Codebook<u8>, dst: &mut [f32], scale: f32) -> DecoderResult<()> {
 246     for el in dst.iter_mut() {
 247         let val                                         = (br.read_cb(cb)? as i8) + 1;
 248         let sign = (val & 1) != 0;
 249         let coef = f32::from(if sign { -(val >> 1) } else { val >> 1 });
 250         *el = coef * scale;
 251     }
 252     Ok(())
 253 }
 254
 255 struct DSP {
 256     imdct:          IMDCT,
 257     window:         [f32; 512],
 258     gain_tab:       [f32; 16],
 259     gain_tab2:      [f32; 32],
 260     tmp:            [f32; ATRAC3_FRAME_SIZE + 64],
 261 }
 262
 263 #[allow(clippy::manual_memcpy)]
 264 impl DSP {
 265     fn new() -> Self {
 266         let mut gain_tab: [f32; 16] = [0.0; 16];
 267         let mut gain_tab2: [f32; 32] = [0.0; 32];
 268
 269         for i in 0..16 {
 270             gain_tab[i] = 2.0f32.powf(4.0 - (i as f32));
 271         }
 272         for i in 0..32 {
 273             gain_tab2[i] = 2.0f32.powf(((i as f32) - 15.0) * -0.125);
 274         }
 275
 276         let mut tmpw: [f32; 256] = [0.0; 256];
 277         for i in 0..tmpw.len() {
 278             tmpw[i] = (((((i as f32) + 0.5) / 256.0 - 0.5) * consts::PI).sin() + 1.0) * 0.5;
 279         }
 280
 281         let mut window: [f32; 512] = [0.0; 512];
 282         for i in 0..tmpw.len() {
 283             let w = tmpw[i] / (tmpw[i] * tmpw[i] + tmpw[255 - i] * tmpw[255 - i]);
 284             window[i] = w;
 285             window[512 - 1 - i] = w;
 286         }
 287
 288         Self {
 289                 imdct:  IMDCT::new(512, false),
 290                 tmp:    [0.0; ATRAC3_FRAME_SIZE + 64],
 291                 gain_tab, gain_tab2, window,
 292             }
 293     }
 294     fn synth_band(&mut self, src: &[f32]) {
 295         let dst = &mut self.tmp;
 296         self.imdct.imdct(src, dst);
 297         for i in 0..512 {
 298             dst[i] *= self.window[i];
 299         }
 300     }
 301     fn apply_gains(&mut self, dst: &mut [f32], delay: &[f32], gain_data: &mut [GainData; 2], block_no: usize, band: usize) {
 302         let prev_ngains = gain_data[block_no ^ 1].ngains[band];
 303         let gain1 = if gain_data[block_no].ngains[band] > 0 {
 304                             self.gain_tab[gain_data[block_no].gain_lev[band][0]]
 305                     } else { 1.0 };
 306
 307         if prev_ngains == 0 {
 308             for i in 0..256 {
 309                 dst[i] = self.tmp[i] * gain1 + delay[i];
 310             }
 311             return;
 312         }
 313
 314         gain_data[block_no ^ 1].gain_lev[band][prev_ngains] = 4;
 315         gain_data[block_no ^ 1].gain_loc[band][prev_ngains] = 32;
 316
 317         let mut off = 0;
 318         for i in 0..prev_ngains {
 319             let start = gain_data[block_no ^ 1].gain_loc[band][i] * 8;
 320             let end = start + 8;
 321
 322             let mut gain2   = self.gain_tab [gain_data[block_no ^ 1].gain_lev[band][i]];
 323             let gain_inc    = self.gain_tab2[gain_data[block_no ^ 1].gain_lev[band][i + 1] + 15 -
 324                                              gain_data[block_no ^ 1].gain_lev[band][i]];
 325
 326             while off < start {
 327                 dst[off] = (self.tmp[off] * gain1 + delay[off]) * gain2;
 328                 off += 1;
 329             }
 330             while off < end {
 331                 dst[off] = (self.tmp[off] * gain1 + delay[off]) * gain2;
 332                 gain2 *= gain_inc;
 333                 off += 1;
 334             }
 335         }
 336         for i in off..256 {
 337             dst[i] = self.tmp[i] * gain1 + delay[i];
 338         }
 339     }
 340     fn qmf_prepare(&mut self, src: &[f32], delay: &[f32], size: usize, swap: bool) {
 341         for i in 0..46 {
 342             self.tmp[i] = delay[i];
 343         }
 344         let (s0, s1) = if !swap {
 345                 (&src[0..], &src[size/2..])
 346             } else {
 347                 (&src[size/2..], &src[0..])
 348             };
 349         for i in (0..size).step_by(4) {
 350             self.tmp[46 + i + 0] = s0[i / 2 + 0] + s1[i / 2 + 0];
 351             self.tmp[46 + i + 1] = s0[i / 2 + 0] - s1[i / 2 + 0];
 352             self.tmp[46 + i + 2] = s0[i / 2 + 1] + s1[i / 2 + 1];
 353             self.tmp[46 + i + 3] = s0[i / 2 + 1] - s1[i / 2 + 1];
 354         }
 355     }
 356     fn qmf_synth(&mut self, dst: &mut [f32], size: usize) {
 357         for i in (0..size).step_by(2) {
 358             let mut acc0 = 0.0;
 359             let mut acc1 = 0.0;
 360
 361             for j in (0..ATRAC3_QMF_FILTER.len()).step_by(2) {
 362                 acc0 += self.tmp[i + j + 0] * ATRAC3_QMF_FILTER[j + 0];
 363                 acc1 += self.tmp[i + j + 1] * ATRAC3_QMF_FILTER[j + 1];
 364             }
 365             dst[i + 0] = acc1 * consts::SQRT_2 / 256.0;
 366             dst[i + 1] = acc0 * consts::SQRT_2 / 256.0;
 367         }
 368     }
 369     fn do_qmf(&mut self, dst: &mut [f32], delay: &mut [f32], swap: bool) {
 370         self.qmf_prepare(dst, delay, 512, swap);
 371         self.qmf_synth(dst, 512);
 372         for i in 0..46 {
 373             delay[i] = self.tmp[512 + i];
 374         }
 375     }
 376     fn do_qmf_out(&mut self, dst: &mut [f32], src: &[f32], delay: &mut [f32]) {
 377         self.qmf_prepare(src, delay, 1024, false);
 378         self.qmf_synth(dst, 1024);
 379         for i in 0..46 {
 380             delay[i] = self.tmp[1024 + i];
 381         }
 382     }
 383 }
 384
 385 struct Atrac3Decoder {
 386     info:       NACodecInfoRef,
 387     channels:   usize,
 388     chmap:      NAChannelMap,
 389     samples:    usize,
 390     mode:       Mode,
 391     scrambled:  bool,
 392
 393     codebooks:  [Codebook<u8>; 7],
 394     dsp:        DSP,
 395     ch_data:    [Channel; 2],
 396     scalefactors:   [f32; 64],
 397
 398     mci_prev:   [usize; 4],
 399     mci_cur:    [usize; 4],
 400     mci_next:   [usize; 4],
 401
 402     weighting_delay:    [u8; 6],
 403
 404     pkt_buf:    Vec<u8>,
 405 }
 406
 407 struct Atrac3CodebookReader {
 408     bits:  &'static [u8],
 409     codes: &'static [u8],
 410 }
 411 impl CodebookDescReader<u8> for Atrac3CodebookReader {
 412     fn bits(&mut self, idx: usize) -> u8  { self.bits[idx] }
 413     fn code(&mut self, idx: usize) -> u32 { u32::from(self.codes[idx]) }
 414     fn sym (&mut self, idx: usize) -> u8 { idx as u8 }
 415     fn len(&mut self) -> usize { self.bits.len() }
 416 }
 417
 418 impl Atrac3Decoder {
 419     fn new() -> Self {
 420         let mut scalefactors: [f32; 64] = [0.0; 64];
 421         for i in 0..scalefactors.len() {
 422             scalefactors[i] = 2.0f32.powf(((i as f32) - 15.0) / 3.0);
 423         }
 424
 425         let mut cb0 = Atrac3CodebookReader { codes: ATRAC3_HUFF_CODES[0], bits: ATRAC3_HUFF_BITS[0] };
 426         let mut cb1 = Atrac3CodebookReader { codes: ATRAC3_HUFF_CODES[1], bits: ATRAC3_HUFF_BITS[1] };
 427         let mut cb2 = Atrac3CodebookReader { codes: ATRAC3_HUFF_CODES[2], bits: ATRAC3_HUFF_BITS[2] };
 428         let mut cb3 = Atrac3CodebookReader { codes: ATRAC3_HUFF_CODES[3], bits: ATRAC3_HUFF_BITS[3] };
 429         let mut cb4 = Atrac3CodebookReader { codes: ATRAC3_HUFF_CODES[4], bits: ATRAC3_HUFF_BITS[4] };
 430         let mut cb5 = Atrac3CodebookReader { codes: ATRAC3_HUFF_CODES[5], bits: ATRAC3_HUFF_BITS[5] };
 431         let mut cb6 = Atrac3CodebookReader { codes: ATRAC3_HUFF_CODES[6], bits: ATRAC3_HUFF_BITS[6] };
 432         Self {
 433             info:       NACodecInfo::new_dummy(),
 434             chmap:      NAChannelMap::new(),
 435             channels:   0,
 436             samples:    0,
 437             mode:       Mode::Mono,
 438             scrambled:  false,
 439
 440             dsp:        DSP::new(),
 441             ch_data:    [Channel::new(), Channel::new()],
 442             codebooks:  [Codebook::new(&mut cb0, CodebookMode::MSB).unwrap(),
 443                          Codebook::new(&mut cb1, CodebookMode::MSB).unwrap(),
 444                          Codebook::new(&mut cb2, CodebookMode::MSB).unwrap(),
 445                          Codebook::new(&mut cb3, CodebookMode::MSB).unwrap(),
 446                          Codebook::new(&mut cb4, CodebookMode::MSB).unwrap(),
 447                          Codebook::new(&mut cb5, CodebookMode::MSB).unwrap(),
 448                          Codebook::new(&mut cb6, CodebookMode::MSB).unwrap() ],
 449
 450             mci_prev:   [3; 4],
 451             mci_cur:    [3; 4],
 452             mci_next:   [3; 4],
 453
 454             weighting_delay: ATRAC3_WEIGHTING_DELAYS,
 455             pkt_buf:    Vec::with_capacity(65536),
 456             scalefactors,
 457         }
 458     }
 459     #[allow(clippy::identity_op)]
 460     fn rev_matrix(&mut self) {
 461         for i in 0..4 {
 462             let c0 = self.mci_prev[i];
 463             let c1 = self.mci_cur[i];
 464             let off;
 465             if c0 != c1 {
 466                 let l0 = ATRAC3_MATRIX_COEFFS[c0 * 2 + 0];
 467                 let r0 = ATRAC3_MATRIX_COEFFS[c1 * 2 + 0];
 468                 let l1 = ATRAC3_MATRIX_COEFFS[c0 * 2 + 1];
 469                 let r1 = ATRAC3_MATRIX_COEFFS[c1 * 2 + 1];
 470                 for idx in 0..8 {
 471                     let t0 = self.ch_data[0].data[idx + i * 256];
 472                     let t1 = self.ch_data[1].data[idx + i * 256];
 473                     let n1 = t0 * interp(l0, r0, idx) + t1 * interp(l1, r1, idx);
 474                     self.ch_data[0].data[idx + i * 256] = n1;
 475                     self.ch_data[1].data[idx + i * 256] = t0 * 2.0 - n1;
 476                 }
 477                 off = i * 256 + 8;
 478             } else {
 479                 off = i * 256;
 480             }
 481             match c1 {
 482                 0 => {
 483                         for i in off..256 {
 484                             let t0 = self.ch_data[0].data[i];
 485                             let t1 = self.ch_data[1].data[i];
 486                             self.ch_data[0].data[i] =       t1  * 2.0;
 487                             self.ch_data[1].data[i] = (t0 - t1) * 2.0;
 488                         }
 489                     },
 490                 1 => {
 491                         for i in off..256 {
 492                             let t0 = self.ch_data[0].data[i];
 493                             let t1 = self.ch_data[1].data[i];
 494                             self.ch_data[0].data[i] = (t0 + t1) *  2.0;
 495                             self.ch_data[1].data[i] =       t1  * -2.0;
 496                         }
 497                     },
 498                 _ => {
 499                         for i in off..256 {
 500                             let t0 = self.ch_data[0].data[i];
 501                             let t1 = self.ch_data[1].data[i];
 502                             self.ch_data[0].data[i] = t0 + t1;
 503                             self.ch_data[1].data[i] = t0 - t1;
 504                         }
 505                     },
 506             };
 507         }
 508     }
 509     fn weigh_channels(&mut self) {
 510         if (self.weighting_delay[1] == 7) && (self.weighting_delay[3] == 7) { return; }
 511         let pw: [f32; 2];
 512         if self.weighting_delay[1] == 7 {
 513             pw = [1.0; 2];
 514         } else {
 515             let w = f32::from(self.weighting_delay[1]) / 7.0;
 516             let iw = (2.0 - w * w).sqrt();
 517             if self.weighting_delay[0] == 0 {
 518                 pw = [w, iw];
 519             } else {
 520                 pw = [iw, w];
 521             }
 522         }
 523         let cw: [f32; 2];
 524         if self.weighting_delay[3] == 7 {
 525             cw = [1.0; 2];
 526         } else {
 527             let w = f32::from(self.weighting_delay[3]) / 7.0;
 528             let iw = (2.0 - w * w).sqrt();
 529             if self.weighting_delay[2] == 0 {
 530                 cw = [w, iw];
 531             } else {
 532                 cw = [iw, w];
 533             }
 534         }
 535
 536         for i in 0..4 {
 537             let off = i * 256;
 538             for j in 0..8 {
 539                 self.ch_data[0].data[off + j] *= interp(pw[0], pw[1], j);
 540                 self.ch_data[1].data[off + j] *= interp(pw[0], pw[1], j);
 541             }
 542             for j in 8..256 {
 543                 self.ch_data[0].data[off + j] *= cw[0];
 544                 self.ch_data[1].data[off + j] *= cw[1];
 545             }
 546         }
 547     }
 548 }
 549
 550 fn interp(a: f32, b: f32, pos: usize) -> f32 {
 551     a + ((pos as f32) / 8.0) * (b - a)
 552 }
 553
 554 impl NADecoder for Atrac3Decoder {
 555     fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
 556         if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
 557             self.info = info.clone();
 558             let edata = info.get_extradata().unwrap();
 559             validate!(edata.len() >= 4);
 560
 561             let mut mr = MemoryReader::new_read(&edata);
 562             let mut br = ByteReader::new(&mut mr);
 563
 564             match edata.len() {
 565                 10 => {
 566                         let version                     = br.read_u32be()?;
 567                         validate!(version == 4);
 568                         self.samples                    = br.read_u16be()? as usize;
 569                         let delay                       = br.read_u16be()? as usize;
 570                         validate!(delay == ATRAC3_DEFAULT_DELAY);
 571                         let mode                        = br.read_u16be()?;
 572                         self.mode = match mode {
 573                                 0 => Mode::Mono,
 574                                 2 => Mode::Stereo,
 575                                 0x12 => Mode::JointStereo,
 576                                 _ => return Err(DecoderError::InvalidData),
 577                             };
 578                         self.channels = if self.mode == Mode::Mono { 1 } else { 2 };
 579                         self.scrambled = true;
 580                     },
 581                 14 | 16 => {
 582                         if edata.len() == 16 { br.read_skip(2)?; }
 583                         self.samples                    = br.read_u32be()? as usize;
 584                         let mode                        = br.read_u16be()?;
 585                         self.mode = if mode != 0 { Mode::JointStereo } else { Mode::Stereo };
 586                         self.channels = 2;
 587                                                           br.read_skip(2)?;
 588                         let ffactor                     = br.read_u16be()? as usize;
 589                         validate!((ffactor > 0) && (ffactor <= 16));
 590                         // calculate block_align / channels / ffactor, validate it's 96/152/192
 591                     },
 592                 _ => { return Err(DecoderError::InvalidData) }
 593             };
 594             validate!(self.samples == ATRAC3_FRAME_SIZE * self.channels);
 595             if self.mode == Mode::Mono {
 596                 self.chmap.add_channel(NAChannelType::C);
 597             } else {
 598                 self.chmap.add_channel(NAChannelType::L);
 599                 self.chmap.add_channel(NAChannelType::R);
 600             }
 601             let ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), self.channels as u8,
 602                                          SND_F32P_FORMAT, self.samples);
 603             self.info = info.replace_info(NACodecTypeInfo::Audio(ainfo));
 604             Ok(())
 605         } else {
 606             Err(DecoderError::InvalidData)
 607         }
 608     }
 609     fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
 610         let info = pkt.get_stream().get_info();
 611         validate!(info.get_properties().is_audio());
 612         let pktbuf = pkt.get_buffer();
 613         validate!(pktbuf.len() > 5);
 614
 615         let frame_size = pktbuf.len();
 616         self.pkt_buf.resize(frame_size, 0);
 617         if self.scrambled {
 618             for (i, s) in pktbuf.iter().enumerate() {
 619                 self.pkt_buf[i] = s ^ ATRAC3_XOR_KEY[i & 3];
 620             }
 621         } else {
 622             let dst = &mut self.pkt_buf[0..frame_size];
 623             dst.copy_from_slice(pktbuf.as_slice());
 624         }
 625
 626         {
 627             let mut br = BitReader::new(&self.pkt_buf[0..frame_size], BitReaderMode::BE);
 628             let id                                  = br.read(6)?;
 629             validate!(id == 0x28);
 630             self.ch_data[0].decode_unit(&mut br, &self.codebooks, &self.scalefactors)?;
 631             self.ch_data[0].synth(&mut self.dsp);
 632         }
 633         if self.channels == 2 {
 634             let off;
 635             if self.mode == Mode::JointStereo {
 636                 for i in 0..frame_size / 2 {
 637                     let b0 = self.pkt_buf[i];
 638                     let b1 = self.pkt_buf[frame_size - i - 1];
 639                     self.pkt_buf[i]                     = b1;
 640                     self.pkt_buf[frame_size - i - 1]    = b0;
 641                 }
 642                 let mut i = 0;
 643                 while (i < frame_size) && (self.pkt_buf[i] == 0xF8) { i += 1; }
 644                 validate!(frame_size - i > 4);
 645                 off = i;
 646             } else {
 647                 off = frame_size / 2;
 648             }
 649             let mut br = BitReader::new(&self.pkt_buf[off..frame_size], BitReaderMode::BE);
 650             if self.mode == Mode::JointStereo {
 651                 let id                                  = br.read(2)?;
 652                 validate!(id == 0x3);
 653             } else {
 654                 let id                                  = br.read(6)?;
 655                 validate!(id == 0x28);
 656             }
 657             if self.mode == Mode::JointStereo {
 658                 for i in 0..self.weighting_delay.len() - 2 {
 659                     self.weighting_delay[i] = self.weighting_delay[i + 2];
 660                 }
 661                 self.weighting_delay[4]                 = br.read(1)? as u8;
 662                 self.weighting_delay[5]                 = br.read(3)? as u8;
 663                 self.mci_prev = self.mci_cur;
 664                 self.mci_cur  = self.mci_next;
 665                 for i in 0..4 {
 666                     self.mci_next[i]                    = br.read(2)? as usize;
 667                 }
 668             }
 669             self.ch_data[1].decode_unit(&mut br, &self.codebooks, &self.scalefactors)?;
 670             self.ch_data[1].synth(&mut self.dsp);
 671         }
 672         if self.mode == Mode::JointStereo {
 673             self.rev_matrix();
 674             self.weigh_channels();
 675         }
 676
 677         let ainfo = self.info.get_properties().get_audio_info().unwrap();
 678
 679         let abuf = alloc_audio_buffer(ainfo, ATRAC3_FRAME_SIZE, self.chmap.clone())?;
 680         let mut adata = abuf.get_abuf_f32().unwrap();
 681         let output = adata.get_data_mut().unwrap();
 682
 683         for ch in 0..self.channels {
 684             let dpos = abuf.get_offset(ch);
 685             self.ch_data[ch].do_qmf(&mut self.dsp, &mut output[dpos..][..ATRAC3_FRAME_SIZE]);
 686         }
 687
 688         let mut frm = NAFrame::new_from_pkt(pkt, self.info.replace_info(NACodecTypeInfo::Audio(ainfo)), abuf);
 689         frm.set_keyframe(true);
 690         Ok(frm.into_ref())
 691     }
 692     fn flush(&mut self) {
 693         for ch_data in self.ch_data.iter_mut() {
 694             ch_data.delay = [0.0; 1024];
 695             ch_data.qmf_delay = [0.0; 64 * 3];
 696         }
 697     }
 698 }
 699
 700 impl NAOptionHandler for Atrac3Decoder {
 701     fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
 702     fn set_options(&mut self, _options: &[NAOption]) { }
 703     fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
 704 }
 705
 706 pub fn get_decoder() -> Box<dyn NADecoder + Send> {
 707     Box::new(Atrac3Decoder::new())
 708 }
 709
 710 #[cfg(test)]
 711 mod test {
 712     use nihav_core::codecs::RegisteredDecoders;
 713     use nihav_core::demuxers::RegisteredDemuxers;
 714     use nihav_codec_support::test::dec_video::test_decode_audio;
 715     use crate::generic_register_all_decoders;
 716     use nihav_realmedia::realmedia_register_all_demuxers;
 717     #[test]
 718     fn test_atrac3() {
 719         let mut dmx_reg = RegisteredDemuxers::new();
 720         realmedia_register_all_demuxers(&mut dmx_reg);
 721         let mut dec_reg = RegisteredDecoders::new();
 722         generic_register_all_decoders(&mut dec_reg);
 723
 724         // samples from private collection
 725         let file = "assets/RV/rv30_atrc_384x208_realproducer_plus_8.51.rm";
 726 //        let file = "assets/RV/rv20_svt_atrc_640x352_realproducer_plus_8.51.rm";
 727         test_decode_audio("realmedia", file, Some(12000), None/*Some("atrac3")*/, &dmx_reg, &dec_reg);
 728     }
 729 }
 730
 731 const ATRAC3_XOR_KEY: [u8; 4] = [ 0x53, 0x7F, 0x61, 0x03 ];
 732
 733 const ATRAC3_HUFF_CODES: [&[u8]; 7] = [
 734     &[ 0x00, 0x04, 0x05, 0x0C, 0x0D, 0x1C, 0x1D, 0x1E, 0x1F ],
 735     &[ 0x00, 0x04, 0x05, 0x06, 0x07 ],
 736     &[ 0x00, 0x04, 0x05, 0x0C, 0x0D, 0x0E, 0x0F ],
 737     &[ 0x00, 0x04, 0x05, 0x0C, 0x0D, 0x1C, 0x1D, 0x1E, 0x1F ], // same as 0
 738     &[ 0x00, 0x02, 0x03, 0x08, 0x09, 0x0A, 0x0B, 0x1C, 0x1D, 0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x0D ],
 739     &[ 0x00, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x14,
 740        0x15, 0x16, 0x17, 0x18, 0x19, 0x34, 0x35, 0x36,
 741        0x37, 0x38, 0x39, 0x3A, 0x3B, 0x78, 0x79, 0x7A,
 742        0x7B, 0x7C, 0x7D, 0x7E, 0x7F, 0x08, 0x09 ],
 743     &[ 0x00, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
 744        0x0F, 0x10, 0x11, 0x24, 0x25, 0x26, 0x27, 0x28,
 745        0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
 746        0x31, 0x32, 0x33, 0x68, 0x69, 0x6A, 0x6B, 0x6C,
 747        0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74,
 748        0x75, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2,
 749        0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA,
 750        0xFB, 0xFC, 0xFD, 0xFE, 0xFF, 0x02, 0x03 ]
 751 ];
 752 const ATRAC3_HUFF_BITS: [&[u8]; 7] = [
 753     &[ 1, 3, 3, 4, 4, 5, 5, 5, 5 ],
 754     &[ 1, 3, 3, 3, 3 ],
 755     &[ 1, 3, 3, 4, 4, 4, 4 ],
 756     &[ 1, 3, 3, 4, 4, 5, 5, 5, 5 ],
 757     &[ 2, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 4, 4 ],
 758     &[ 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 4, 4 ],
 759     &[ 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7,
 760        7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 4, 4 ],
 761 ];
 762
 763 const ATRAC3_MAX_QUANT: [f32; 8] = [ 0.0, 1.0/1.5, 1.0/2.5, 1.0/3.5, 1.0/4.5, 1.0/7.5, 1.0/15.5, 1.0/31.5 ];
 764
 765 const ATRAC3_SUBBANDS: [usize; 32 + 1] = [
 766       0,   8,  16,  24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160, 176,
 767     192, 224, 256, 288, 320, 352, 384, 416, 448, 480, 512, 576, 640, 704, 768, 896,
 768    1024
 769 ];
 770
 771 const ATRAC3_MATRIX_COEFFS: [f32; 8] = [ 0.0, 2.0, 2.0, 2.0, 0.0, 0.0, 1.0, 1.0 ];
 772
 773 const ATRAC3_QMF_FILTER: [f32; 48] = [
 774     -0.000029238139, -0.000184109580, -0.000112315138,  0.000602345390,
 775      0.000484503806, -0.001705877949, -0.001041114796,  0.004068033770,
 776      0.001566677820, -0.008430772461, -0.001512299757,  0.015680588782,
 777     -0.000122339843, -0.026883240789,  0.004925364163,  0.043472178280,
 778     -0.015603342094, -0.068180441856,  0.037618979812,  0.108652018011,
 779     -0.087192758918, -0.198768734932,  0.264158189297,  0.928483188152,
 780      0.928483188152,  0.264158189297, -0.198768734932, -0.087192758918,
 781      0.108652018011,  0.037618979812, -0.068180441856, -0.015603342094,
 782      0.043472178280,  0.004925364163, -0.026883240789, -0.000122339843,
 783      0.015680588782, -0.001512299757, -0.008430772461,  0.001566677820,
 784      0.004068033770, -0.001041114796, -0.001705877949,  0.000484503806,
 785      0.000602345390, -0.000112315138, -0.000184109580, -0.000029238139
 786 ];