nihav-commonfmt/src/codecs/aac.rs

   1 use nihav_core::formats::*;
   2 use nihav_core::frame::*;
   3 use nihav_core::codecs::*;
   4 use nihav_codec_support::dsp::mdct::IMDCT;
   5 use nihav_codec_support::dsp::window::*;
   6 use nihav_core::io::bitreader::*;
   7 use nihav_core::io::codebook::*;
   8 use std::fmt;
   9 use nihav_core::io::intcode::*;
  10 use std::mem;
  11 use std::ptr;
  12 use std::str::FromStr;
  13 use std::f32::consts;
  14
  15 #[allow(non_camel_case_types)]
  16 #[derive(Clone,Copy,PartialEq)]
  17 enum M4AType {
  18     None,
  19     Main,
  20     LC,
  21     SSR,
  22     LTP,
  23     SBR,
  24     Scalable,
  25     TwinVQ,
  26     CELP,
  27     HVXC,
  28     TTSI,
  29     MainSynth,
  30     WavetableSynth,
  31     GeneralMIDI,
  32     Algorithmic,
  33     ER_AAC_LC,
  34     ER_AAC_LTP,
  35     ER_AAC_Scalable,
  36     ER_TwinVQ,
  37     ER_BSAC,
  38     ER_AAC_LD,
  39     ER_CELP,
  40     ER_HVXC,
  41     ER_HILN,
  42     ER_Parametric,
  43     SSC,
  44     PS,
  45     MPEGSurround,
  46     Layer1,
  47     Layer2,
  48     Layer3,
  49     DST,
  50     ALS,
  51     SLS,
  52     SLSNonCore,
  53     ER_AAC_ELD,
  54     SMRSimple,
  55     SMRMain,
  56     Reserved,
  57     Unknown,
  58 }
  59
  60 const M4A_TYPES: &[M4AType] = &[
  61     M4AType::None,              M4AType::Main,      M4AType::LC,            M4AType::SSR,
  62     M4AType::LTP,               M4AType::SBR,       M4AType::Scalable,      M4AType::TwinVQ,
  63     M4AType::CELP,              M4AType::HVXC,      M4AType::Reserved,      M4AType::Reserved,
  64     M4AType::TTSI,              M4AType::MainSynth, M4AType::WavetableSynth, M4AType::GeneralMIDI,
  65     M4AType::Algorithmic,       M4AType::ER_AAC_LC, M4AType::Reserved,      M4AType::ER_AAC_LTP,
  66     M4AType::ER_AAC_Scalable,   M4AType::ER_TwinVQ, M4AType::ER_BSAC,       M4AType::ER_AAC_LD,
  67     M4AType::ER_CELP,           M4AType::ER_HVXC,   M4AType::ER_HILN,       M4AType::ER_Parametric,
  68     M4AType::SSC,               M4AType::PS,        M4AType::MPEGSurround,  M4AType::Reserved /*escape*/,
  69     M4AType::Layer1,            M4AType::Layer2,    M4AType::Layer3,        M4AType::DST,
  70     M4AType::ALS,               M4AType::SLS,       M4AType::SLSNonCore,    M4AType::ER_AAC_ELD,
  71     M4AType::SMRSimple,         M4AType::SMRMain,
  72 ];
  73 const M4A_TYPE_NAMES: &[&str] = &[
  74     "None", "AAC Main", "AAC LC", "AAC SSR", "AAC LTP", "SBR", "AAC Scalable", "TwinVQ", "CELP", "HVXC",
  75     /*"(reserved10)", "(reserved11)", */ "TTSI",
  76     "Main synthetic", "Wavetable synthesis", "General MIDI", "Algorithmic Synthesis and Audio FX",
  77     "ER AAC LC", /*"(reserved18)",*/ "ER AAC LTP", "ER AAC Scalable", "ER TwinVQ", "ER BSAC", "ER AAC LD",
  78     "ER CELP", "ER HVXC", "ER HILN", "ER Parametric", "SSC", "PS", "MPEG Surround", /*"(escape)",*/
  79     "Layer-1", "Layer-2", "Layer-3", "DST", "ALS", "SLS", "SLS non-core", "ER AAC ELD", "SMR Simple", "SMR Main",
  80     "(reserved)", "(unknown)",
  81 ];
  82
  83 impl fmt::Display for M4AType {
  84     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  85         write!(f, "{}", M4A_TYPE_NAMES[*self as usize])
  86     }
  87 }
  88
  89 const AAC_SAMPLE_RATES: [u32; 16] = [
  90     96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
  91     16000, 12000, 11025,  8000,  7350, 0, 0, 0
  92 ];
  93
  94 const AAC_CHANNELS: [usize; 8] = [ 0, 1, 2, 3, 4, 5, 6, 8 ];
  95
  96 struct M4AInfo {
  97     otype:          M4AType,
  98     srate:          u32,
  99     channels:       usize,
 100     samples:        usize,
 101     sbr_ps_info:    Option<(u32, usize)>,
 102     sbr_present:    bool,
 103     ps_present:     bool,
 104 }
 105
 106 impl M4AInfo {
 107     fn new() -> Self {
 108         Self {
 109             otype:          M4AType::None,
 110             srate:          0,
 111             channels:       0,
 112             samples:        0,
 113             sbr_ps_info:    Option::None,
 114             sbr_present:    false,
 115             ps_present:     false,
 116         }
 117     }
 118     fn read_object_type(br: &mut BitReader) -> DecoderResult<M4AType> {
 119         let otypeidx;
 120         if br.peek(5) == 31 {
 121                                                           br.skip(5)?;
 122             otypeidx                                    = (br.read(6)? as usize) + 32;
 123         } else {
 124             otypeidx                                    = br.read(5)? as usize;
 125         }
 126         if otypeidx >= M4A_TYPES.len() {
 127             Ok(M4AType::Unknown)
 128         } else {
 129             Ok(M4A_TYPES[otypeidx])
 130         }
 131     }
 132     fn read_sampling_frequency(br: &mut BitReader) -> DecoderResult<u32> {
 133         if br.peek(4) == 15 {
 134             let srate                                   = br.read(24)?;
 135             Ok(srate)
 136         } else {
 137             let srate_idx                               = br.read(4)? as usize;
 138             Ok(AAC_SAMPLE_RATES[srate_idx])
 139         }
 140     }
 141     fn read_channel_config(br: &mut BitReader) -> DecoderResult<usize> {
 142         let chidx                                       = br.read(4)? as usize;
 143         if chidx < AAC_CHANNELS.len() {
 144             Ok(AAC_CHANNELS[chidx])
 145         } else {
 146             Ok(chidx)
 147         }
 148     }
 149     fn read(&mut self, src: &[u8]) -> DecoderResult<()> {
 150         let mut br = BitReader::new(src, BitReaderMode::BE);
 151         self.otype = Self::read_object_type(&mut br)?;
 152         self.srate = Self::read_sampling_frequency(&mut br)?;
 153         validate!(self.srate > 0);
 154         self.channels = Self::read_channel_config(&mut br)?;
 155
 156         if (self.otype == M4AType::SBR) || (self.otype == M4AType::PS) {
 157             let ext_srate = Self::read_sampling_frequency(&mut br)?;
 158             self.otype = Self::read_object_type(&mut br)?;
 159             let ext_chans;
 160             if self.otype == M4AType::ER_BSAC {
 161                 ext_chans = Self::read_channel_config(&mut br)?;
 162             } else {
 163                 ext_chans = 0;
 164             }
 165             self.sbr_ps_info = Some((ext_srate, ext_chans));
 166         }
 167
 168         match self.otype {
 169             M4AType::Main | M4AType::LC | M4AType::SSR | M4AType::Scalable | M4AType::TwinVQ |
 170             M4AType::ER_AAC_LC | M4AType::ER_AAC_LTP | M4AType::ER_AAC_Scalable | M4AType::ER_TwinVQ |
 171             M4AType::ER_BSAC | M4AType::ER_AAC_LD => {
 172                 // GASpecificConfig
 173                     let short_frame                     = br.read_bool()?;
 174                     self.samples = if short_frame { 960 } else { 1024 };
 175                     let depends_on_core                 = br.read_bool()?;
 176                     if depends_on_core {
 177                         let _delay                      = br.read(14)?;
 178                     }
 179                     let extension_flag                  = br.read_bool()?;
 180                     if self.channels == 0 {
 181                         unimplemented!("program config element");
 182                     }
 183                     if (self.otype == M4AType::Scalable) || (self.otype == M4AType::ER_AAC_Scalable) {
 184                         let _layer                      = br.read(3)?;
 185                     }
 186                     if extension_flag {
 187                         if self.otype == M4AType::ER_BSAC {
 188                             let _num_subframes          = br.read(5)? as usize;
 189                             let _layer_length           = br.read(11)?;
 190                         }
 191                         if (self.otype == M4AType::ER_AAC_LC) ||
 192                            (self.otype == M4AType::ER_AAC_LTP) ||
 193                            (self.otype == M4AType::ER_AAC_Scalable) ||
 194                            (self.otype == M4AType::ER_AAC_LD) {
 195                             let _section_data_resilience    = br.read_bool()?;
 196                             let _scalefactors_resilience    = br.read_bool()?;
 197                             let _spectral_data_resilience   = br.read_bool()?;
 198                         }
 199                         let extension_flag3             = br.read_bool()?;
 200                         if extension_flag3 {
 201                             unimplemented!("version3 extensions");
 202                         }
 203                     }
 204                 },
 205             M4AType::CELP => { unimplemented!("CELP config"); },
 206             M4AType::HVXC => { unimplemented!("HVXC config"); },
 207             M4AType::TTSI => { unimplemented!("TTS config"); },
 208             M4AType::MainSynth | M4AType::WavetableSynth | M4AType::GeneralMIDI | M4AType::Algorithmic => { unimplemented!("structured audio config"); },
 209             M4AType::ER_CELP => { unimplemented!("ER CELP config"); },
 210             M4AType::ER_HVXC => { unimplemented!("ER HVXC config"); },
 211             M4AType::ER_HILN | M4AType::ER_Parametric => { unimplemented!("parametric config"); },
 212             M4AType::SSC => { unimplemented!("SSC config"); },
 213             M4AType::MPEGSurround => {
 214                                                         br.skip(1)?; // sacPayloadEmbedding
 215                     unimplemented!("MPEG Surround config");
 216                 },
 217             M4AType::Layer1 | M4AType::Layer2 | M4AType::Layer3 => { unimplemented!("MPEG Layer 1/2/3 config"); },
 218             M4AType::DST => { unimplemented!("DST config"); },
 219             M4AType::ALS => {
 220                                                         br.skip(5)?; // fillBits
 221                     unimplemented!("ALS config");
 222                 },
 223             M4AType::SLS | M4AType::SLSNonCore => { unimplemented!("SLS config"); },
 224             M4AType::ER_AAC_ELD => { unimplemented!("ELD config"); },
 225             M4AType::SMRSimple | M4AType::SMRMain => { unimplemented!("symbolic music config"); },
 226             _ => {},
 227         };
 228         match self.otype {
 229             M4AType::ER_AAC_LC | M4AType::ER_AAC_LTP | M4AType::ER_AAC_Scalable | M4AType::ER_TwinVQ |
 230             M4AType::ER_BSAC | M4AType::ER_AAC_LD | M4AType::ER_CELP | M4AType::ER_HVXC |
 231             M4AType::ER_HILN | M4AType::ER_Parametric | M4AType::ER_AAC_ELD => {
 232                     let ep_config                       = br.read(2)?;
 233                     if (ep_config == 2) || (ep_config == 3) {
 234                         unimplemented!("error protection config");
 235                     }
 236                     if ep_config == 3 {
 237                         let direct_mapping              = br.read_bool()?;
 238                         validate!(direct_mapping);
 239                     }
 240                 },
 241             _ => {},
 242         };
 243         if self.sbr_ps_info.is_some() && (br.left() >= 16) {
 244             let sync                                    = br.read(11)?;
 245             if sync == 0x2B7 {
 246                 let ext_otype = Self::read_object_type(&mut br)?;
 247                 if ext_otype == M4AType::SBR {
 248                     self.sbr_present                    = br.read_bool()?;
 249                     if self.sbr_present {
 250                         let _ext_srate = Self::read_sampling_frequency(&mut br)?;
 251                         if br.left() >= 12 {
 252                             let sync                    = br.read(11)?;
 253                             if sync == 0x548 {
 254                                 self.ps_present         = br.read_bool()?;
 255                             }
 256                         }
 257                     }
 258                 }
 259                 if ext_otype == M4AType::PS {
 260                     self.sbr_present                    = br.read_bool()?;
 261                     if self.sbr_present {
 262                         let _ext_srate = Self::read_sampling_frequency(&mut br)?;
 263                     }
 264                     let _ext_channels = br.read(4)?;
 265                 }
 266             }
 267         }
 268
 269         Ok(())
 270     }
 271 }
 272
 273 impl fmt::Display for M4AInfo {
 274     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 275         write!(f, "MPEG 4 Audio {}, {} Hz, {} channels, {} samples per frame",
 276                self.otype, self.srate, self.channels, self.samples)
 277     }
 278 }
 279
 280 const MAX_WINDOWS:  usize = 8;
 281 const MAX_SFBS:     usize = 64;
 282
 283 #[derive(Clone,Copy)]
 284 struct ICSInfo {
 285     window_sequence:        u8,
 286     prev_window_sequence:   u8,
 287     window_shape:           bool,
 288     prev_window_shape:      bool,
 289     scale_factor_grouping:  [bool; MAX_WINDOWS],
 290     group_start:            [usize; MAX_WINDOWS],
 291     window_groups:          usize,
 292     num_windows:            usize,
 293     max_sfb:                usize,
 294     predictor_data:         Option<LTPData>,
 295     long_win:               bool,
 296 }
 297
 298 const ONLY_LONG_SEQUENCE:   u8 = 0;
 299 const LONG_START_SEQUENCE:  u8 = 1;
 300 const EIGHT_SHORT_SEQUENCE: u8 = 2;
 301 const LONG_STOP_SEQUENCE:   u8 = 3;
 302
 303 impl ICSInfo {
 304     fn new() -> Self {
 305         Self {
 306             window_sequence:        0,
 307             prev_window_sequence:   0,
 308             window_shape:           false,
 309             prev_window_shape:      false,
 310             scale_factor_grouping:  [false; MAX_WINDOWS],
 311             group_start:            [0; MAX_WINDOWS],
 312             num_windows:            0,
 313             window_groups:          0,
 314             max_sfb:                0,
 315             predictor_data:         None,
 316             long_win:               true,
 317         }
 318     }
 319     fn decode_ics_info(&mut self, br: &mut BitReader) -> DecoderResult<()> {
 320         self.prev_window_sequence = self.window_sequence;
 321         self.prev_window_shape    = self.window_shape;
 322         let ics_reserved_bit                            = br.read(1)?;
 323         validate!(ics_reserved_bit == 0);
 324         self.window_sequence                            = br.read(2)? as u8;
 325         match self.prev_window_sequence {
 326             ONLY_LONG_SEQUENCE | LONG_STOP_SEQUENCE => {
 327                     validate!((self.window_sequence == ONLY_LONG_SEQUENCE) ||
 328                               (self.window_sequence == LONG_START_SEQUENCE));
 329                 },
 330             LONG_START_SEQUENCE | EIGHT_SHORT_SEQUENCE => {
 331                     validate!((self.window_sequence == EIGHT_SHORT_SEQUENCE) ||
 332                               (self.window_sequence == LONG_STOP_SEQUENCE));
 333                 },
 334             _ => {},
 335         };
 336         self.window_shape                               = br.read_bool()?;
 337         self.window_groups = 1;
 338         if self.window_sequence == EIGHT_SHORT_SEQUENCE {
 339             self.long_win = false;
 340             self.num_windows = 8;
 341             self.max_sfb                                = br.read(4)? as usize;
 342             for i in 0..MAX_WINDOWS-1 {
 343                 self.scale_factor_grouping[i]           = br.read_bool()?;
 344                 if !self.scale_factor_grouping[i] {
 345                     self.group_start[self.window_groups] = i + 1;
 346                     self.window_groups += 1;
 347                 }
 348             }
 349         } else {
 350             self.long_win = true;
 351             self.num_windows = 1;
 352             self.max_sfb                                = br.read(6)? as usize;
 353             self.predictor_data = LTPData::read(br)?;
 354         }
 355         Ok(())
 356     }
 357     fn get_group_start(&self, g: usize) -> usize {
 358         if g == 0 {
 359             0
 360         } else if g >= self.window_groups {
 361             if self.long_win { 1 } else { 8 }
 362         } else {
 363             self.group_start[g]
 364         }
 365     }
 366 }
 367
 368 #[derive(Clone,Copy)]
 369 struct LTPData {
 370 }
 371
 372 impl LTPData {
 373     fn read(br: &mut BitReader) -> DecoderResult<Option<Self>> {
 374         let predictor_data_present                      = br.read_bool()?;
 375         if !predictor_data_present { return Ok(None); }
 376 unimplemented!("predictor data");
 377 /*
 378         if is_main {
 379             let predictor_reset                         = br.read_bool()?;
 380             if predictor_reset {
 381                 let predictor_reset_group_number        = br.read(5)?;
 382             }
 383             for sfb in 0..max_sfb.min(PRED_SFB_MAX) {
 384                 prediction_used[sfb]                    = br.read_bool()?;
 385             }
 386         } else {
 387             let ltp_data_present                        = br.read_bool()?;
 388             if ltp_data_present {
 389                 //ltp data
 390             }
 391             if common_window {
 392                 let ltp_data_present                    = br.read_bool()?;
 393                 if ltp_data_present {
 394                     //ltp data
 395                 }
 396             }
 397         }
 398         Ok(Some(Self { }))
 399 */
 400     }
 401 }
 402
 403 #[derive(Clone,Copy)]
 404 #[allow(dead_code)]
 405 struct PulseData {
 406     number_pulse:       usize,
 407     pulse_start_sfb:    usize,
 408     pulse_offset:       [u8; 4],
 409     pulse_amp:          [u8; 4],
 410 }
 411
 412 impl PulseData {
 413     fn read(br: &mut BitReader) -> DecoderResult<Option<Self>> {
 414         let pulse_data_present                          = br.read_bool()?;
 415         if !pulse_data_present { return Ok(None); }
 416
 417         let number_pulse                                = (br.read(2)? as usize) + 1;
 418         let pulse_start_sfb                             = br.read(6)? as usize;
 419         let mut pulse_offset: [u8; 4] = [0; 4];
 420         let mut pulse_amp: [u8; 4] = [0; 4];
 421         for i in 0..number_pulse {
 422             pulse_offset[i]                             = br.read(5)? as u8;
 423             pulse_amp[i]                                = br.read(4)? as u8;
 424         }
 425         Ok(Some(Self{ number_pulse, pulse_start_sfb, pulse_offset, pulse_amp }))
 426     }
 427 }
 428
 429 const TNS_MAX_ORDER: usize = 20;
 430 const TNS_MAX_LONG_BANDS: [usize; 12] = [ 31, 31, 34, 40, 42, 51, 46, 46, 42, 42, 42, 39 ];
 431 const TNS_MAX_SHORT_BANDS: [usize; 12] = [ 9, 9, 10, 14, 14, 14, 14, 14, 14, 14, 14, 14 ];
 432
 433 #[derive(Clone,Copy)]
 434 struct TNSCoeffs {
 435     length:     usize,
 436     order:      usize,
 437     direction:  bool,
 438     compress:   bool,
 439     coef:       [f32; TNS_MAX_ORDER + 1],
 440 }
 441
 442 impl TNSCoeffs {
 443     fn new() -> Self {
 444         Self {
 445             length: 0, order: 0, direction: false, compress: false, coef: [0.0; TNS_MAX_ORDER + 1],
 446         }
 447     }
 448     fn read(&mut self, br: &mut BitReader, long_win: bool, coef_res: bool, max_order: usize) -> DecoderResult<()> {
 449         self.length                                     = br.read(if long_win { 6 } else { 4 })? as usize;
 450         self.order                                      = br.read(if long_win { 5 } else { 3 })? as usize;
 451         validate!(self.order <= max_order);
 452         if self.order > 0 {
 453             self.direction                              = br.read_bool()?;
 454             self.compress                               = br.read_bool()?;
 455             let mut coef_bits = 3;
 456             if coef_res      { coef_bits += 1; }
 457             if self.compress { coef_bits -= 1; }
 458             let sign_mask = 1 << (coef_bits - 1);
 459             let neg_mask  = !(sign_mask * 2 - 1);
 460
 461             let fac_base = if coef_res { 1 << 3 } else { 1 << 2 } as f32;
 462             let iqfac   = (fac_base - 0.5) / (consts::PI / 2.0);
 463             let iqfac_m = (fac_base + 0.5) / (consts::PI / 2.0);
 464             let mut tmp: [f32; TNS_MAX_ORDER] = [0.0; TNS_MAX_ORDER];
 465             for el in tmp.iter_mut().take(self.order) {
 466                 let val                                 = br.read(coef_bits)? as i8;
 467                 let c = f32::from(if (val & sign_mask) != 0 { val | neg_mask } else { val });
 468                 *el = (if c >= 0.0 { c / iqfac } else { c / iqfac_m }).sin();
 469             }
 470             // convert to LPC coefficients
 471             let mut b: [f32; TNS_MAX_ORDER + 1] = [0.0; TNS_MAX_ORDER + 1];
 472             for m in 1..=self.order {
 473                 for i in 1..m {
 474                     b[i] = self.coef[i - 1] + tmp[m - 1] * self.coef[m - i - 1];
 475                 }
 476                 for i in 1..m {
 477                     self.coef[i - 1] = b[i];
 478                 }
 479                 self.coef[m - 1] = tmp[m - 1];
 480             }
 481         }
 482         Ok(())
 483     }
 484 }
 485
 486 #[derive(Clone,Copy)]
 487 #[allow(dead_code)]
 488 struct TNSData {
 489     n_filt:     [usize; MAX_WINDOWS],
 490     coef_res:   [bool; MAX_WINDOWS],
 491     coeffs:     [[TNSCoeffs; 4]; MAX_WINDOWS],
 492 }
 493
 494 impl TNSData {
 495     fn read(br: &mut BitReader, long_win: bool, num_windows: usize, max_order: usize) -> DecoderResult<Option<Self>> {
 496         let tns_data_present                            = br.read_bool()?;
 497         if !tns_data_present { return Ok(None); }
 498         let mut n_filt: [usize; MAX_WINDOWS] = [0; MAX_WINDOWS];
 499         let mut coef_res: [bool; MAX_WINDOWS] = [false; MAX_WINDOWS];
 500         let mut coeffs: [[TNSCoeffs; 4]; MAX_WINDOWS] = [[TNSCoeffs::new(); 4]; MAX_WINDOWS];
 501         for w in 0..num_windows {
 502             n_filt[w]                                   = br.read(if long_win { 2 } else { 1 })? as usize;
 503             if n_filt[w] != 0 {
 504                 coef_res[w]                             = br.read_bool()?;
 505             }
 506             for filt in 0..n_filt[w] {
 507                 coeffs[w][filt].read(br, long_win, coef_res[w], max_order)?;
 508             }
 509         }
 510         Ok(Some(Self { n_filt, coef_res, coeffs }))
 511     }
 512 }
 513
 514 #[derive(Clone,Copy)]
 515 #[allow(dead_code)]
 516 struct GainControlData {
 517     max_band:       u8,
 518 }
 519
 520 impl GainControlData {
 521     fn read(br: &mut BitReader) -> DecoderResult<Option<Self>> {
 522         let gain_control_data_present                   = br.read_bool()?;
 523         if !gain_control_data_present { return Ok(None); }
 524 unimplemented!("gain control data");
 525 /*        self.max_band                                   = br.read(2)? as u8;
 526         if window_sequence == ONLY_LONG_SEQUENCE {
 527             for bd in 0..max_band
 528 ...
 529         }
 530         Ok(Some(Self { }))*/
 531     }
 532 }
 533
 534 const ZERO_HCB:         u8 = 0;
 535 const FIRST_PAIR_HCB:   u8 = 5;
 536 const ESC_HCB:          u8 = 11;
 537 const RESERVED_HCB:     u8 = 12;
 538 const NOISE_HCB:        u8 = 13;
 539 const INTENSITY_HCB2:   u8 = 14;
 540 const INTENSITY_HCB:    u8 = 15;
 541
 542 struct Codebooks {
 543     scale_cb:       Codebook<i8>,
 544     spec_cb:        [Codebook<u16>; 11],
 545 }
 546
 547 fn scale_map(idx: usize) -> i8 { (idx as i8) - 60 }
 548 fn cb_map(idx: usize) -> u16 { idx as u16 }
 549
 550 impl Codebooks {
 551     fn new() -> Self {
 552         let mut coderead = TableCodebookDescReader::new(AAC_SCF_CODEBOOK_CODES, AAC_SCF_CODEBOOK_BITS, scale_map);
 553         let scale_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
 554         let mut spec_cb: [Codebook<u16>; 11];
 555         unsafe {
 556             spec_cb = mem::uninitialized();
 557             for i in 0..AAC_SPEC_CODES.len() {
 558                 let mut coderead = TableCodebookDescReader::new(AAC_SPEC_CODES[i], AAC_SPEC_BITS[i], cb_map);
 559                 ptr::write(&mut spec_cb[i], Codebook::new(&mut coderead, CodebookMode::MSB).unwrap());
 560             }
 561         }
 562         Self { scale_cb, spec_cb }
 563     }
 564 }
 565
 566 #[derive(Clone)]
 567 struct ICS {
 568     global_gain:    u8,
 569     info:           ICSInfo,
 570     pulse_data:     Option<PulseData>,
 571     tns_data:       Option<TNSData>,
 572     gain_control:   Option<GainControlData>,
 573     sect_cb:        [[u8; MAX_SFBS]; MAX_WINDOWS],
 574     sect_len:       [[usize; MAX_SFBS]; MAX_WINDOWS],
 575     sfb_cb:         [[u8; MAX_SFBS]; MAX_WINDOWS],
 576     num_sec:        [usize; MAX_WINDOWS],
 577     scales:         [[u8; MAX_SFBS]; MAX_WINDOWS],
 578     sbinfo:         GASubbandInfo,
 579     coeffs:         [f32; 1024],
 580     delay:          [f32; 1024],
 581 }
 582
 583 const INTENSITY_SCALE_MIN:  i16 = -155;
 584 const NOISE_SCALE_MIN:      i16 = -100;
 585 impl ICS {
 586     fn new(sbinfo: GASubbandInfo) -> Self {
 587         Self {
 588             global_gain:    0,
 589             info:           ICSInfo::new(),
 590             pulse_data:     None,
 591             tns_data:       None,
 592             gain_control:   None,
 593             sect_cb:        [[0; MAX_SFBS]; MAX_WINDOWS],
 594             sect_len:       [[0; MAX_SFBS]; MAX_WINDOWS],
 595             sfb_cb:         [[0; MAX_SFBS]; MAX_WINDOWS],
 596             scales:         [[0; MAX_SFBS]; MAX_WINDOWS],
 597             num_sec:        [0; MAX_WINDOWS],
 598             sbinfo,
 599             coeffs:         [0.0; 1024],
 600             delay:          [0.0; 1024],
 601         }
 602     }
 603     fn decode_section_data(&mut self, br: &mut BitReader, may_have_intensity: bool) -> DecoderResult<()> {
 604         let sect_bits = if self.info.long_win { 5 } else { 3 };
 605         let sect_esc_val = (1 << sect_bits) - 1;
 606
 607         for g in 0..self.info.window_groups {
 608             let mut k = 0;
 609             let mut l = 0;
 610             while k < self.info.max_sfb {
 611                 self.sect_cb[g][l]                      = br.read(4)? as u8;
 612                 self.sect_len[g][l] = 0;
 613                 validate!(self.sect_cb[g][l] != RESERVED_HCB);
 614                 if ((self.sect_cb[g][l] == INTENSITY_HCB) || (self.sect_cb[g][l] == INTENSITY_HCB2)) && !may_have_intensity {
 615                     return Err(DecoderError::InvalidData);
 616                 }
 617                 loop {
 618                     let sect_len_incr                   = br.read(sect_bits)? as usize;
 619                     self.sect_len[g][l] += sect_len_incr;
 620                     if sect_len_incr < sect_esc_val { break; }
 621                 }
 622                 validate!(k + self.sect_len[g][l] <= self.info.max_sfb);
 623                 for _ in 0..self.sect_len[g][l] {
 624                     self.sfb_cb[g][k] = self.sect_cb[g][l];
 625                     k += 1;
 626                 }
 627                 l += 1;
 628             }
 629             self.num_sec[g] = l;
 630         }
 631         Ok(())
 632     }
 633     fn is_intensity(&self, g: usize, sfb: usize) -> bool {
 634         (self.sfb_cb[g][sfb] == INTENSITY_HCB) || (self.sfb_cb[g][sfb] == INTENSITY_HCB2)
 635     }
 636     fn get_intensity_dir(&self, g: usize, sfb: usize) -> bool {
 637         self.sfb_cb[g][sfb] == INTENSITY_HCB
 638     }
 639     fn decode_scale_factor_data(&mut self, br: &mut BitReader, codebooks: &Codebooks) -> DecoderResult<()> {
 640         let mut noise_pcm_flag = true;
 641         let mut scf_normal = i16::from(self.global_gain);
 642         let mut scf_intensity = 0i16;
 643         let mut scf_noise  = 0i16;
 644         for g in 0..self.info.window_groups {
 645             for sfb in 0..self.info.max_sfb {
 646                 if self.sfb_cb[g][sfb] != ZERO_HCB {
 647                     if self.is_intensity(g, sfb) {
 648                         let diff                        = i16::from(br.read_cb(&codebooks.scale_cb)?);
 649                         scf_intensity += diff;
 650                         validate!((scf_intensity >= INTENSITY_SCALE_MIN) && (scf_intensity < INTENSITY_SCALE_MIN + 256));
 651                         self.scales[g][sfb] = (scf_intensity - INTENSITY_SCALE_MIN) as u8;
 652                     } else if self.sfb_cb[g][sfb] == NOISE_HCB {
 653                         if noise_pcm_flag {
 654                             noise_pcm_flag = false;
 655                             scf_noise                   = (br.read(9)? as i16) - 256 + i16::from(self.global_gain) - 90;
 656                         } else {
 657                             scf_noise                  += i16::from(br.read_cb(&codebooks.scale_cb)?);
 658                         }
 659                         validate!((scf_noise >= NOISE_SCALE_MIN) && (scf_noise < NOISE_SCALE_MIN + 256));
 660                         self.scales[g][sfb] = (scf_noise - NOISE_SCALE_MIN) as u8;
 661                     } else {
 662                         scf_normal                     += i16::from(br.read_cb(&codebooks.scale_cb)?);
 663                         validate!((scf_normal >= 0) && (scf_normal < 255));
 664                         self.scales[g][sfb] = scf_normal as u8;
 665                     }
 666                 }
 667             }
 668         }
 669         Ok(())
 670     }
 671     fn get_band_start(&self, swb: usize) -> usize {
 672         if self.info.long_win {
 673             self.sbinfo.long_bands[swb]
 674         } else {
 675             self.sbinfo.short_bands[swb]
 676         }
 677     }
 678     fn get_num_bands(&self) -> usize {
 679         if self.info.long_win {
 680             self.sbinfo.long_bands.len() - 1
 681         } else {
 682             self.sbinfo.short_bands.len() - 1
 683         }
 684     }
 685     fn decode_spectrum(&mut self, br: &mut BitReader, codebooks: &Codebooks) -> DecoderResult<()> {
 686         self.coeffs = [0.0; 1024];
 687         for g in 0..self.info.window_groups {
 688             let cur_w   = self.info.get_group_start(g);
 689             let next_w  = self.info.get_group_start(g + 1);
 690             for sfb in 0..self.info.max_sfb {
 691                 let start = self.get_band_start(sfb);
 692                 let end   = self.get_band_start(sfb + 1);
 693                 let cb_idx = self.sfb_cb[g][sfb];
 694                 for w in cur_w..next_w {
 695                     let dst = &mut self.coeffs[start + w*128..end + w*128];
 696                     match cb_idx {
 697                         ZERO_HCB => { /* zeroes */ },
 698                         NOISE_HCB => { /* noise */ },
 699                         INTENSITY_HCB | INTENSITY_HCB2 => { /* intensity */ },
 700                         _ => {
 701                                 let unsigned = AAC_UNSIGNED_CODEBOOK[(cb_idx - 1) as usize];
 702                                 let scale = get_scale(self.scales[g][sfb]);
 703                                 let cb = &codebooks.spec_cb[(cb_idx - 1) as usize];
 704                                 if cb_idx < FIRST_PAIR_HCB {
 705                                     decode_quads(br, cb, unsigned, scale, dst)?;
 706                                 } else {
 707                                     decode_pairs(br, cb, unsigned, cb_idx == ESC_HCB,
 708                                                  AAC_CODEBOOK_MODULO[(cb_idx - FIRST_PAIR_HCB) as usize], scale, dst)?;
 709                                 }
 710                             },
 711                     };
 712                 }
 713             }
 714         }
 715         Ok(())
 716     }
 717     fn place_pulses(&mut self) {
 718         if let Some(ref pdata) = self.pulse_data {
 719             if pdata.pulse_start_sfb >= self.sbinfo.long_bands.len() - 1 { return; }
 720             let mut k = self.get_band_start(pdata.pulse_start_sfb);
 721             let mut band = pdata.pulse_start_sfb;
 722             for pno in 0..pdata.number_pulse {
 723                 k += pdata.pulse_offset[pno] as usize;
 724                 if k >= 1024 { return; }
 725                 while self.get_band_start(band + 1) <= k { band += 1; }
 726                 let scale = get_scale(self.scales[0][band]);
 727                 let mut base = self.coeffs[k];
 728                 if base != 0.0 {
 729                     base = requant(self.coeffs[k], scale);
 730                 }
 731                 if base > 0.0 {
 732                     base += f32::from(pdata.pulse_amp[pno]);
 733                 } else {
 734                     base -= f32::from(pdata.pulse_amp[pno]);
 735                 }
 736                 self.coeffs[k] = iquant(base) * scale;
 737             }
 738         }
 739     }
 740     fn decode_ics(&mut self, br: &mut BitReader, codebooks: &Codebooks, m4atype: M4AType, common_window: bool, may_have_intensity: bool) -> DecoderResult<()> {
 741         self.global_gain                                = br.read(8)? as u8;
 742         if !common_window {
 743             self.info.decode_ics_info(br)?;
 744         }
 745         self.decode_section_data(br, may_have_intensity)?;
 746         self.decode_scale_factor_data(br, codebooks)?;
 747         self.pulse_data = PulseData::read(br)?;
 748         validate!(self.pulse_data.is_none() || self.info.long_win);
 749         let tns_max_order;
 750         if !self.info.long_win {
 751             tns_max_order = 7;
 752         } else if m4atype == M4AType::LC {
 753             tns_max_order = 12;
 754         } else {
 755             tns_max_order = TNS_MAX_ORDER;
 756         }
 757         self.tns_data = TNSData::read(br, self.info.long_win, self.info.num_windows, tns_max_order)?;
 758         if m4atype == M4AType::SSR {
 759             self.gain_control = GainControlData::read(br)?;
 760         } else {
 761             let gain_control_data_present               = br.read_bool()?;
 762             validate!(!gain_control_data_present);
 763         }
 764         self.decode_spectrum(br, codebooks)?;
 765         Ok(())
 766     }
 767     fn synth_channel(&mut self, dsp: &mut DSP, dst: &mut [f32], srate_idx: usize) {
 768         self.place_pulses();
 769         if let Some(ref tns_data) = self.tns_data {
 770             let tns_max_bands = (if self.info.long_win {
 771                     TNS_MAX_LONG_BANDS[srate_idx]
 772                 } else {
 773                     TNS_MAX_SHORT_BANDS[srate_idx]
 774                 }).min(self.info.max_sfb);
 775             for w in 0..self.info.num_windows {
 776                 let mut bottom = self.get_num_bands();
 777                 for f in 0..tns_data.n_filt[w] {
 778                     let top = bottom;
 779                     bottom = if top >= tns_data.coeffs[w][f].length { top - tns_data.coeffs[w][f].length } else { 0 };
 780                     let order = tns_data.coeffs[w][f].order;
 781                     if order == 0 { continue; }
 782                     let start = w * 128 + self.get_band_start(tns_max_bands.min(bottom));
 783                     let end   = w * 128 + self.get_band_start(tns_max_bands.min(top));
 784                     let lpc = &tns_data.coeffs[w][f].coef;
 785                     let mut state = [0.0f32; 64];
 786                     let mut sidx = 32;
 787                     if !tns_data.coeffs[w][f].direction {
 788                         for m in start..end {
 789                             for i in 0..order {
 790                                 self.coeffs[m] -= state[(sidx + i) & 63] * lpc[i];
 791                             }
 792                             sidx = (sidx + 63) & 63;
 793                             state[sidx] = self.coeffs[m];
 794                         }
 795                     } else {
 796                         for m in (start..end).rev() {
 797                             for i in 0..order {
 798                                 self.coeffs[m] -= state[(sidx + i) & 63] * lpc[i];
 799                             }
 800                             sidx = (sidx + 63) & 63;
 801                             state[sidx] = self.coeffs[m];
 802                         }
 803                     }
 804                 }
 805             }
 806         }
 807         dsp.synth(&self.coeffs, &mut self.delay, self.info.window_sequence, self.info.window_shape, self.info.prev_window_shape, dst);
 808     }
 809 }
 810
 811 fn get_scale(scale: u8) -> f32 {
 812     2.0f32.powf(0.25 * (f32::from(scale) - 100.0 - 56.0))
 813 }
 814 fn iquant(val: f32) -> f32 {
 815     if val < 0.0 {
 816         -((-val).powf(4.0 / 3.0))
 817     } else {
 818         val.powf(4.0 / 3.0)
 819     }
 820 }
 821 fn requant(val: f32, scale: f32) -> f32 {
 822     if scale == 0.0 { return 0.0; }
 823     let bval = val / scale;
 824     if bval >= 0.0 {
 825         val.powf(3.0 / 4.0)
 826     } else {
 827         -((-val).powf(3.0 / 4.0))
 828     }
 829 }
 830 fn decode_quads(br: &mut BitReader, cb: &Codebook<u16>, unsigned: bool, scale: f32, dst: &mut [f32]) -> DecoderResult<()> {
 831     for out in dst.chunks_mut(4) {
 832         let cw                                          = br.read_cb(cb)? as usize;
 833         if unsigned {
 834             for i in 0..4 {
 835                 let val = AAC_QUADS[cw][i];
 836                 if val != 0 {
 837                     if br.read_bool()? {
 838                         out[i] = iquant(-f32::from(val)) * scale;
 839                     } else {
 840                         out[i] = iquant( f32::from(val)) * scale;
 841                     }
 842                 }
 843             }
 844         } else {
 845             for i in 0..4 {
 846                 out[i] = iquant(f32::from(AAC_QUADS[cw][i] - 1)) * scale;
 847             }
 848         }
 849     }
 850     Ok(())
 851 }
 852 fn decode_pairs(br: &mut BitReader, cb: &Codebook<u16>, unsigned: bool, escape: bool, modulo: u16, scale: f32, dst: &mut [f32]) -> DecoderResult<()> {
 853     for out in dst.chunks_mut(2) {
 854         let cw                                          = br.read_cb(cb)?;
 855         let mut x = (cw / modulo) as i16;
 856         let mut y = (cw % modulo) as i16;
 857         if unsigned {
 858             if x != 0 && br.read_bool()? {
 859                 x = -x;
 860             }
 861             if y != 0 && br.read_bool()? {
 862                 y = -y;
 863             }
 864         } else {
 865             x -= (modulo >> 1) as i16;
 866             y -= (modulo >> 1) as i16;
 867         }
 868         if escape {
 869             if (x == 16) || (x == -16) {
 870                 x += read_escape(br, x > 0)?;
 871             }
 872             if (y == 16) || (y == -16) {
 873                 y += read_escape(br, y > 0)?;
 874             }
 875         }
 876         out[0] = iquant(f32::from(x)) * scale;
 877         out[1] = iquant(f32::from(y)) * scale;
 878     }
 879     Ok(())
 880 }
 881 fn read_escape(br: &mut BitReader, sign: bool) -> DecoderResult<i16> {
 882     let prefix                                          = br.read_code(UintCodeType::UnaryOnes)? as u8;
 883     validate!(prefix < 9);
 884     let bits                                            = br.read(prefix + 4)? as i16;
 885     if sign {
 886         Ok(bits)
 887     } else {
 888         Ok(-bits)
 889     }
 890 }
 891
 892 #[derive(Clone)]
 893 struct ChannelPair {
 894     pair:               bool,
 895     channel:            usize,
 896     common_window:      bool,
 897     ms_mask_present:    u8,
 898     ms_used:            [[bool; MAX_SFBS]; MAX_WINDOWS],
 899     ics:                [ICS; 2],
 900 }
 901
 902 impl ChannelPair {
 903     fn new(pair: bool, channel: usize, sbinfo: GASubbandInfo) -> Self {
 904         Self {
 905             pair, channel,
 906             common_window:      false,
 907             ms_mask_present:    0,
 908             ms_used:            [[false; MAX_SFBS]; MAX_WINDOWS],
 909             ics:                [ICS::new(sbinfo), ICS::new(sbinfo)],
 910         }
 911     }
 912     fn decode_ga_sce(&mut self, br: &mut BitReader, codebooks: &Codebooks, m4atype: M4AType) -> DecoderResult<()> {
 913         self.ics[0].decode_ics(br, codebooks, m4atype, false, false)?;
 914         Ok(())
 915     }
 916     fn decode_ga_cpe(&mut self, br: &mut BitReader, codebooks: &Codebooks, m4atype: M4AType) -> DecoderResult<()> {
 917         let common_window                               = br.read_bool()?;
 918         self.common_window = common_window;
 919         if common_window {
 920             self.ics[0].info.decode_ics_info(br)?;
 921             self.ms_mask_present                        = br.read(2)? as u8;
 922             validate!(self.ms_mask_present != 3);
 923             if self.ms_mask_present == 1 {
 924                 for g in 0..self.ics[0].info.window_groups {
 925                     for sfb in 0..self.ics[0].info.max_sfb {
 926                         self.ms_used[g][sfb]            = br.read_bool()?;
 927                     }
 928                 }
 929             }
 930             self.ics[1].info = self.ics[0].info;
 931         }
 932         self.ics[0].decode_ics(br, codebooks, m4atype, common_window, true)?;
 933         self.ics[1].decode_ics(br, codebooks, m4atype, common_window, false)?;
 934         if common_window && self.ms_mask_present != 0 {
 935             let mut g = 0;
 936             for w in 0..self.ics[0].info.num_windows {
 937                 if w > 0 && self.ics[0].info.scale_factor_grouping[w - 1] {
 938                     g += 1;
 939                 }
 940                 for sfb in 0..self.ics[0].info.max_sfb {
 941                     let start = w * 128 + self.ics[0].get_band_start(sfb);
 942                     let end   = w * 128 + self.ics[0].get_band_start(sfb + 1);
 943                     if self.ics[0].is_intensity(g, sfb) {
 944                         let invert = (self.ms_mask_present == 1) && self.ms_used[g][sfb];
 945                         let dir = self.ics[0].get_intensity_dir(g, sfb) ^ invert;
 946                         let scale = 0.5f32.powf(0.25 * (f32::from(self.ics[0].scales[g][sfb]) + f32::from(INTENSITY_SCALE_MIN)));
 947                         if !dir {
 948                             for i in start..end {
 949                                 self.ics[1].coeffs[i] = scale * self.ics[0].coeffs[i];
 950                             }
 951                         } else {
 952                             for i in start..end {
 953                                 self.ics[1].coeffs[i] = -scale * self.ics[0].coeffs[i];
 954                             }
 955                         }
 956                     } else if (self.ms_mask_present == 2) || self.ms_used[g][sfb] {
 957                         for i in start..end {
 958                             let tmp = self.ics[0].coeffs[i] - self.ics[1].coeffs[i];
 959                             self.ics[0].coeffs[i] += self.ics[1].coeffs[i];
 960                             self.ics[1].coeffs[i] = tmp;
 961                         }
 962                     }
 963                 }
 964             }
 965         }
 966         Ok(())
 967     }
 968     fn synth_audio(&mut self, dsp: &mut DSP, abuf: &mut NABufferType, srate_idx: usize) {
 969         let mut adata = abuf.get_abuf_f32().unwrap();
 970         let output = adata.get_data_mut().unwrap();
 971         let off0 = abuf.get_offset(self.channel);
 972         let off1 = abuf.get_offset(self.channel + 1);
 973         self.ics[0].synth_channel(dsp, &mut output[off0..], srate_idx);
 974         if self.pair {
 975             self.ics[1].synth_channel(dsp, &mut output[off1..], srate_idx);
 976         }
 977     }
 978 }
 979
 980 struct DSP {
 981     kbd_long_win:   [f32; 1024],
 982     kbd_short_win:  [f32; 128],
 983     sine_long_win:  [f32; 1024],
 984     sine_short_win: [f32; 128],
 985     imdct_long:     IMDCT,
 986     imdct_short:    IMDCT,
 987     tmp:            [f32; 2048],
 988     ew_buf:         [f32; 1152],
 989 }
 990
 991 const SHORT_WIN_POINT0: usize = 512 - 64;
 992 const SHORT_WIN_POINT1: usize = 512 + 64;
 993
 994 impl DSP {
 995     fn new() -> Self {
 996         let mut kbd_long_win: [f32; 1024] = [0.0; 1024];
 997         let mut kbd_short_win: [f32; 128] = [0.0; 128];
 998         generate_window(WindowType::KaiserBessel(4.0), 1.0, 1024, true, &mut kbd_long_win);
 999         generate_window(WindowType::KaiserBessel(6.0), 1.0,  128, true, &mut kbd_short_win);
1000         let mut sine_long_win: [f32; 1024] = [0.0; 1024];
1001         let mut sine_short_win: [f32; 128] = [0.0; 128];
1002         generate_window(WindowType::Sine, 1.0, 1024, true, &mut sine_long_win);
1003         generate_window(WindowType::Sine, 1.0,  128, true, &mut sine_short_win);
1004         Self {
1005             kbd_long_win, kbd_short_win,
1006             sine_long_win, sine_short_win,
1007             imdct_long: IMDCT::new(1024 * 2, true),
1008             imdct_short: IMDCT::new(128 * 2, true),
1009             tmp: [0.0; 2048], ew_buf: [0.0; 1152],
1010         }
1011     }
1012     #[allow(clippy::cyclomatic_complexity)]
1013     fn synth(&mut self, coeffs: &[f32; 1024], delay: &mut [f32; 1024], seq: u8, window_shape: bool, prev_window_shape: bool, dst: &mut [f32]) {
1014         let long_win  = if window_shape { &self.kbd_long_win  } else { &self.sine_long_win };
1015         let short_win = if window_shape { &self.kbd_short_win } else { &self.sine_short_win };
1016         let left_long_win  = if prev_window_shape { &self.kbd_long_win  } else { &self.sine_long_win };
1017         let left_short_win = if prev_window_shape { &self.kbd_short_win } else { &self.sine_short_win };
1018         if seq != EIGHT_SHORT_SEQUENCE {
1019             self.imdct_long.imdct(coeffs, &mut self.tmp);
1020         } else {
1021             for (ain, aout) in coeffs.chunks(128).zip(self.tmp.chunks_mut(256)) {
1022                 self.imdct_short.imdct(ain, aout);
1023             }
1024             self.ew_buf = [0.0; 1152];
1025             for (w, src) in self.tmp.chunks(256).enumerate() {
1026                 if w > 0 {
1027                     for i in 0..128 {
1028                         self.ew_buf[w * 128 + i] += src[i] * short_win[i];
1029                     }
1030                 } else { // to be left-windowed
1031                     for i in 0..128 {
1032                         self.ew_buf[i] = src[i];
1033                     }
1034                 }
1035                 for i in 0..128 {
1036                     self.ew_buf[w * 128 + i + 128] += src[i + 128] * short_win[127 - i];
1037                 }
1038             }
1039         }
1040         if seq == ONLY_LONG_SEQUENCE { // should be the most common case
1041             for i in 0..1024 {
1042                 dst[i] = delay[i] + self.tmp[i] * left_long_win[i];
1043                 delay[i] = self.tmp[i + 1024] * long_win[1023 - i];
1044             }
1045             return;
1046         }
1047         // output new data
1048         match seq {
1049             ONLY_LONG_SEQUENCE | LONG_START_SEQUENCE => {
1050                     for i in 0..1024 {
1051                         dst[i] = self.tmp[i] * left_long_win[i] + delay[i];
1052                     }
1053                 },
1054             EIGHT_SHORT_SEQUENCE => {
1055                     for i in 0..SHORT_WIN_POINT0 {
1056                         dst[i] = delay[i];
1057                     }
1058                     for i in SHORT_WIN_POINT0..SHORT_WIN_POINT1 {
1059                         let j = i - SHORT_WIN_POINT0;
1060                         dst[i] = delay[i] + self.ew_buf[j] * left_short_win[j];
1061                     }
1062                     for i in SHORT_WIN_POINT1..1024 {
1063                         let j = i - SHORT_WIN_POINT0;
1064                         dst[i] = self.ew_buf[j];
1065                     }
1066                 },
1067             LONG_STOP_SEQUENCE => {
1068                     for i in 0..SHORT_WIN_POINT0 {
1069                         dst[i] = delay[i];
1070                     }
1071                     for i in SHORT_WIN_POINT0..SHORT_WIN_POINT1 {
1072                         dst[i] = delay[i] + self.tmp[i] * left_short_win[i - SHORT_WIN_POINT0];
1073                     }
1074                     for i in SHORT_WIN_POINT1..1024 {
1075                         dst[i] = self.tmp[i];
1076                     }
1077                 },
1078             _ => unreachable!(""),
1079         };
1080         // save delay
1081         match seq {
1082             ONLY_LONG_SEQUENCE | LONG_STOP_SEQUENCE => {
1083                     for i in 0..1024 {
1084                         delay[i] = self.tmp[i + 1024] * long_win[1023 - i];
1085                     }
1086                 },
1087             EIGHT_SHORT_SEQUENCE => {
1088                     for i in 0..SHORT_WIN_POINT1 { // last part is already windowed
1089                         delay[i] = self.ew_buf[i + 512+64];
1090                     }
1091                     for i in SHORT_WIN_POINT1..1024 {
1092                         delay[i] = 0.0;
1093                     }
1094                 },
1095             LONG_START_SEQUENCE   => {
1096                     for i in 0..SHORT_WIN_POINT0 {
1097                         delay[i] = self.tmp[i + 1024];
1098                     }
1099                     for i in SHORT_WIN_POINT0..SHORT_WIN_POINT1 {
1100                         delay[i] = self.tmp[i + 1024] * short_win[127 - (i - SHORT_WIN_POINT0)];
1101                     }
1102                     for i in SHORT_WIN_POINT1..1024 {
1103                         delay[i] = 0.0;
1104                     }
1105                 },
1106             _ => unreachable!(""),
1107         };
1108     }
1109 }
1110
1111 struct AACDecoder {
1112     info:       NACodecInfoRef,
1113     chmap:      NAChannelMap,
1114     m4ainfo:    M4AInfo,
1115     pairs:      Vec<ChannelPair>,
1116     codebooks:  Codebooks,
1117     dsp:        DSP,
1118     sbinfo:     GASubbandInfo,
1119 }
1120
1121 impl AACDecoder {
1122     fn new() -> Self {
1123         AACDecoder {
1124             info:       NACodecInfo::new_dummy(),
1125             chmap:      NAChannelMap::new(),
1126             m4ainfo:    M4AInfo::new(),
1127             pairs:      Vec::new(),
1128             codebooks:  Codebooks::new(),
1129             dsp:        DSP::new(),
1130             sbinfo:     AAC_SUBBAND_INFO[0],
1131         }
1132     }
1133     fn set_pair(&mut self, pair_no: usize, channel: usize, pair: bool) -> DecoderResult<()> {
1134         if self.pairs.len() <= pair_no {
1135             self.pairs.push(ChannelPair::new(pair, channel, self.sbinfo));
1136         } else {
1137             validate!(self.pairs[pair_no].channel == channel);
1138             validate!(self.pairs[pair_no].pair    == pair);
1139         }
1140         validate!(if pair { channel + 1 } else { channel } < self.m4ainfo.channels);
1141         Ok(())
1142     }
1143     fn decode_ga(&mut self, br: &mut BitReader, abuf: &mut NABufferType) -> DecoderResult<()> {
1144         let mut cur_pair = 0;
1145         let mut cur_ch   = 0;
1146         while br.left() > 3 {
1147             let id                                      = br.read(3)?;
1148             match id {
1149                 0 => { // ID_SCE
1150                         let _tag                        = br.read(4)?;
1151                         self.set_pair(cur_pair, cur_ch, false)?;
1152                         self.pairs[cur_pair].decode_ga_sce(br, &self.codebooks, self.m4ainfo.otype)?;
1153                         cur_pair += 1;
1154                         cur_ch   += 1;
1155                     },
1156                 1 => { // ID_CPE
1157                         let _tag                        = br.read(4)?;
1158                         self.set_pair(cur_pair, cur_ch, true)?;
1159                         self.pairs[cur_pair].decode_ga_cpe(br, &self.codebooks, self.m4ainfo.otype)?;
1160                         cur_pair += 1;
1161                         cur_ch   += 2;
1162                     },
1163                 2 => { // ID_CCE
1164                         unimplemented!("coupling channel element");
1165                     },
1166                 3 => { // ID_LFE
1167                         let _tag                        = br.read(4)?;
1168                         self.set_pair(cur_pair, cur_ch, false)?;
1169                         self.pairs[cur_pair].decode_ga_sce(br, &self.codebooks, self.m4ainfo.otype)?;
1170                         cur_pair += 1;
1171                         cur_ch   += 1;
1172                     },
1173                 4 => { // ID_DSE
1174                         let _id                         = br.read(4)?;
1175                         let align                       = br.read_bool()?;
1176                         let mut count                   = br.read(8)? as u32;
1177                         if count == 255 { count        += br.read(8)? as u32; }
1178                         if align {                        br.align(); }
1179                                                           br.skip(count * 8)?; // no SBR payload or such
1180                     },
1181                 5 => { // ID_PCE
1182                         unimplemented!("program config");
1183                     },
1184                 6 => { // ID_FIL
1185                         let mut count                   = br.read(4)? as usize;
1186                         if count == 15 {
1187                             count                      += br.read(8)? as usize;
1188                             count -= 1;
1189                         }
1190                         for _ in 0..count {
1191                             // ext payload
1192                                                           br.skip(8)?;
1193                         }
1194                     },
1195                 7 => { // ID_TERM
1196                         break;
1197                     },
1198                 _ => { unreachable!(); },
1199             };
1200         }
1201         let srate_idx = GASubbandInfo::find_idx(self.m4ainfo.srate);
1202         for pair in 0..cur_pair {
1203             self.pairs[pair].synth_audio(&mut self.dsp, abuf, srate_idx);
1204         }
1205         Ok(())
1206     }
1207 }
1208
1209 impl NADecoder for AACDecoder {
1210     fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
1211         if let NACodecTypeInfo::Audio(_) = info.get_properties() {
1212             let edata = info.get_extradata().unwrap();
1213             validate!(edata.len() >= 2);
1214
1215 //print!("edata:"); for s in edata.iter() { print!(" {:02X}", *s);}println!("");
1216             self.m4ainfo.read(&edata)?;
1217
1218             //println!("{}", self.m4ainfo);
1219             if (self.m4ainfo.otype != M4AType::LC) || (self.m4ainfo.channels > 2) || (self.m4ainfo.samples != 1024) {
1220                 return Err(DecoderError::NotImplemented);
1221             }
1222             self.sbinfo = GASubbandInfo::find(self.m4ainfo.srate);
1223
1224             let ainfo = NAAudioInfo::new(self.m4ainfo.srate, self.m4ainfo.channels as u8,
1225                                          SND_F32P_FORMAT, self.m4ainfo.samples);
1226             self.info = info.replace_info(NACodecTypeInfo::Audio(ainfo));
1227
1228             if self.m4ainfo.channels >= DEFAULT_CHANNEL_MAP.len() {
1229                 return Err(DecoderError::NotImplemented);
1230             }
1231             let chmap_str = DEFAULT_CHANNEL_MAP[self.m4ainfo.channels];
1232             if chmap_str.is_empty() { return Err(DecoderError::NotImplemented); }
1233             self.chmap = NAChannelMap::from_str(chmap_str).unwrap();
1234
1235             Ok(())
1236         } else {
1237             Err(DecoderError::InvalidData)
1238         }
1239     }
1240     fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
1241         let info = pkt.get_stream().get_info();
1242         validate!(info.get_properties().is_audio());
1243         let pktbuf = pkt.get_buffer();
1244
1245         let ainfo = self.info.get_properties().get_audio_info().unwrap();
1246         let mut abuf = alloc_audio_buffer(ainfo, self.m4ainfo.samples, self.chmap.clone())?;
1247
1248         let mut br = BitReader::new(&pktbuf, BitReaderMode::BE);
1249         match self.m4ainfo.otype {
1250             M4AType::LC => {
1251                     self.decode_ga(&mut br, &mut abuf)?;
1252                 },
1253             _ => { unimplemented!(""); }
1254         }
1255
1256         let mut frm = NAFrame::new_from_pkt(pkt, self.info.replace_info(NACodecTypeInfo::Audio(ainfo)), abuf);
1257         frm.set_keyframe(true);
1258         Ok(frm.into_ref())
1259     }
1260     fn flush(&mut self) {
1261         for pair in self.pairs.iter_mut() {
1262             pair.ics[0].delay = [0.0; 1024];
1263             pair.ics[1].delay = [0.0; 1024];
1264         }
1265     }
1266 }
1267
1268 impl NAOptionHandler for AACDecoder {
1269     fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
1270     fn set_options(&mut self, _options: &[NAOption]) { }
1271     fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
1272 }
1273
1274 pub fn get_decoder() -> Box<dyn NADecoder + Send> {
1275     Box::new(AACDecoder::new())
1276 }
1277
1278 #[cfg(test)]
1279 mod test {
1280     use nihav_core::codecs::RegisteredDecoders;
1281     use nihav_core::demuxers::RegisteredDemuxers;
1282     use nihav_codec_support::test::dec_video::test_decode_audio;
1283     use crate::generic_register_all_decoders;
1284     use nihav_realmedia::realmedia_register_all_demuxers;
1285     #[test]
1286     fn test_aac() {
1287         let mut dmx_reg = RegisteredDemuxers::new();
1288         realmedia_register_all_demuxers(&mut dmx_reg);
1289         let mut dec_reg = RegisteredDecoders::new();
1290         generic_register_all_decoders(&mut dec_reg);
1291
1292 //        let file = "assets/RV/rv40_weighted_mc.rmvb";
1293         let file = "assets/RV/rv40_weighted_mc_2.rmvb";
1294         test_decode_audio("realmedia", file, Some(12000), None/*Some("aac")*/, &dmx_reg, &dec_reg);
1295     }
1296 }
1297
1298 const AAC_SCF_CODEBOOK_BITS: &[u8] = &[
1299     18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
1300     19, 19, 19, 18, 19, 18, 17, 17, 16, 17, 16, 16, 16, 16, 15, 15,
1301     14, 14, 14, 14, 14, 14, 13, 13, 12, 12, 12, 11, 12, 11, 10, 10,
1302     10,  9,  9,  8,  8,  8,  7,  6,  6,  5,  4,  3,  1,  4,  4,  5,
1303      6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 10, 11, 11, 11, 11, 12,
1304     12, 13, 13, 13, 14, 14, 16, 15, 16, 15, 18, 19, 19, 19, 19, 19,
1305     19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
1306     19, 19, 19, 19, 19, 19, 19, 19, 19
1307 ];
1308
1309 const AAC_SCF_CODEBOOK_CODES: &[u32] = &[
1310     0x3FFE8, 0x3FFE6, 0x3FFE7, 0x3FFE5, 0x7FFF5, 0x7FFF1, 0x7FFED, 0x7FFF6,
1311     0x7FFEE, 0x7FFEF, 0x7FFF0, 0x7FFFC, 0x7FFFD, 0x7FFFF, 0x7FFFE, 0x7FFF7,
1312     0x7FFF8, 0x7FFFB, 0x7FFF9, 0x3FFE4, 0x7FFFA, 0x3FFE3, 0x1FFEF, 0x1FFF0,
1313     0x0FFF5, 0x1FFEE, 0x0FFF2, 0x0FFF3, 0x0FFF4, 0x0FFF1, 0x07FF6, 0x07FF7,
1314     0x03FF9, 0x03FF5, 0x03FF7, 0x03FF3, 0x03FF6, 0x03FF2, 0x01FF7, 0x01FF5,
1315     0x00FF9, 0x00FF7, 0x00FF6, 0x007F9, 0x00FF4, 0x007F8, 0x003F9, 0x003F7,
1316     0x003F5, 0x001F8, 0x001F7, 0x000FA, 0x000F8, 0x000F6, 0x00079, 0x0003A,
1317     0x00038, 0x0001A, 0x0000B, 0x00004, 0x00000, 0x0000A, 0x0000C, 0x0001B,
1318     0x00039, 0x0003B, 0x00078, 0x0007A, 0x000F7, 0x000F9, 0x001F6, 0x001F9,
1319     0x003F4, 0x003F6, 0x003F8, 0x007F5, 0x007F4, 0x007F6, 0x007F7, 0x00FF5,
1320     0x00FF8, 0x01FF4, 0x01FF6, 0x01FF8, 0x03FF8, 0x03FF4, 0x0FFF0, 0x07FF4,
1321     0x0FFF6, 0x07FF5, 0x3FFE2, 0x7FFD9, 0x7FFDA, 0x7FFDB, 0x7FFDC, 0x7FFDD,
1322     0x7FFDE, 0x7FFD8, 0x7FFD2, 0x7FFD3, 0x7FFD4, 0x7FFD5, 0x7FFD6, 0x7FFF2,
1323     0x7FFDF, 0x7FFE7, 0x7FFE8, 0x7FFE9, 0x7FFEA, 0x7FFEB, 0x7FFE6, 0x7FFE0,
1324     0x7FFE1, 0x7FFE2, 0x7FFE3, 0x7FFE4, 0x7FFE5, 0x7FFD7, 0x7FFEC, 0x7FFF4,
1325     0x7FFF3
1326 ];
1327
1328 const AAC_SPEC_CB1_BITS: &[u8] = &[
1329     11,  9, 11, 10,  7, 10, 11,  9, 11, 10,  7, 10,  7,  5,  7,  9,
1330      7, 10, 11,  9, 11,  9,  7,  9, 11,  9, 11,  9,  7,  9,  7,  5,
1331      7,  9,  7,  9,  7,  5,  7,  5,  1,  5,  7,  5,  7,  9,  7,  9,
1332      7,  5,  7,  9,  7,  9, 11,  9, 11,  9,  7,  9, 11,  9, 11, 10,
1333      7,  9,  7,  5,  7,  9,  7, 10, 11,  9, 11, 10,  7,  9, 11,  9,
1334     11
1335 ];
1336 const AAC_SPEC_CB1_CODES: &[u16] = &[
1337     0x7f8, 0x1f1, 0x7fd, 0x3f5, 0x068, 0x3f0, 0x7f7, 0x1ec,
1338     0x7f5, 0x3f1, 0x072, 0x3f4, 0x074, 0x011, 0x076, 0x1eb,
1339     0x06c, 0x3f6, 0x7fc, 0x1e1, 0x7f1, 0x1f0, 0x061, 0x1f6,
1340     0x7f2, 0x1ea, 0x7fb, 0x1f2, 0x069, 0x1ed, 0x077, 0x017,
1341     0x06f, 0x1e6, 0x064, 0x1e5, 0x067, 0x015, 0x062, 0x012,
1342     0x000, 0x014, 0x065, 0x016, 0x06d, 0x1e9, 0x063, 0x1e4,
1343     0x06b, 0x013, 0x071, 0x1e3, 0x070, 0x1f3, 0x7fe, 0x1e7,
1344     0x7f3, 0x1ef, 0x060, 0x1ee, 0x7f0, 0x1e2, 0x7fa, 0x3f3,
1345     0x06a, 0x1e8, 0x075, 0x010, 0x073, 0x1f4, 0x06e, 0x3f7,
1346     0x7f6, 0x1e0, 0x7f9, 0x3f2, 0x066, 0x1f5, 0x7ff, 0x1f7,
1347     0x7f4
1348 ];
1349 const AAC_SPEC_CB2_BITS: &[u8] = &[
1350     9, 7, 9, 8, 6, 8, 9, 8, 9, 8, 6, 7, 6, 5, 6, 7,
1351     6, 8, 9, 7, 8, 8, 6, 8, 9, 7, 9, 8, 6, 7, 6, 5,
1352     6, 7, 6, 8, 6, 5, 6, 5, 3, 5, 6, 5, 6, 8, 6, 7,
1353     6, 5, 6, 8, 6, 8, 9, 7, 9, 8, 6, 8, 8, 7, 9, 8,
1354     6, 7, 6, 4, 6, 8, 6, 7, 9, 7, 9, 7, 6, 8, 9, 7,
1355     9
1356 ];
1357 const AAC_SPEC_CB2_CODES: &[u16] = &[
1358     0x1f3, 0x06f, 0x1fd, 0x0eb, 0x023, 0x0ea, 0x1f7, 0x0e8,
1359     0x1fa, 0x0f2, 0x02d, 0x070, 0x020, 0x006, 0x02b, 0x06e,
1360     0x028, 0x0e9, 0x1f9, 0x066, 0x0f8, 0x0e7, 0x01b, 0x0f1,
1361     0x1f4, 0x06b, 0x1f5, 0x0ec, 0x02a, 0x06c, 0x02c, 0x00a,
1362     0x027, 0x067, 0x01a, 0x0f5, 0x024, 0x008, 0x01f, 0x009,
1363     0x000, 0x007, 0x01d, 0x00b, 0x030, 0x0ef, 0x01c, 0x064,
1364     0x01e, 0x00c, 0x029, 0x0f3, 0x02f, 0x0f0, 0x1fc, 0x071,
1365     0x1f2, 0x0f4, 0x021, 0x0e6, 0x0f7, 0x068, 0x1f8, 0x0ee,
1366     0x022, 0x065, 0x031, 0x002, 0x026, 0x0ed, 0x025, 0x06a,
1367     0x1fb, 0x072, 0x1fe, 0x069, 0x02e, 0x0f6, 0x1ff, 0x06d,
1368     0x1f6
1369 ];
1370 const AAC_SPEC_CB3_BITS: &[u8] = &[
1371      1,  4,  8,  4,  5,  8,  9,  9, 10,  4,  6,  9,  6,  6,  9,  9,
1372      9, 10,  9, 10, 13,  9,  9, 11, 11, 10, 12,  4,  6, 10,  6,  7,
1373     10, 10, 10, 12,  5,  7, 11,  6,  7, 10,  9,  9, 11,  9, 10, 13,
1374      8,  9, 12, 10, 11, 12,  8, 10, 15,  9, 11, 15, 13, 14, 16,  8,
1375     10, 14,  9, 10, 14, 12, 12, 15, 11, 12, 16, 10, 11, 15, 12, 12,
1376     15
1377 ];
1378 const AAC_SPEC_CB3_CODES: &[u16] = &[
1379     0x0000, 0x0009, 0x00ef, 0x000b, 0x0019, 0x00f0, 0x01eb, 0x01e6,
1380     0x03f2, 0x000a, 0x0035, 0x01ef, 0x0034, 0x0037, 0x01e9, 0x01ed,
1381     0x01e7, 0x03f3, 0x01ee, 0x03ed, 0x1ffa, 0x01ec, 0x01f2, 0x07f9,
1382     0x07f8, 0x03f8, 0x0ff8, 0x0008, 0x0038, 0x03f6, 0x0036, 0x0075,
1383     0x03f1, 0x03eb, 0x03ec, 0x0ff4, 0x0018, 0x0076, 0x07f4, 0x0039,
1384     0x0074, 0x03ef, 0x01f3, 0x01f4, 0x07f6, 0x01e8, 0x03ea, 0x1ffc,
1385     0x00f2, 0x01f1, 0x0ffb, 0x03f5, 0x07f3, 0x0ffc, 0x00ee, 0x03f7,
1386     0x7ffe, 0x01f0, 0x07f5, 0x7ffd, 0x1ffb, 0x3ffa, 0xffff, 0x00f1,
1387     0x03f0, 0x3ffc, 0x01ea, 0x03ee, 0x3ffb, 0x0ff6, 0x0ffa, 0x7ffc,
1388     0x07f2, 0x0ff5, 0xfffe, 0x03f4, 0x07f7, 0x7ffb, 0x0ff7, 0x0ff9,
1389     0x7ffa
1390 ];
1391 const AAC_SPEC_CB4_BITS: &[u8] = &[
1392      4,  5,  8,  5,  4,  8,  9,  8, 11,  5,  5,  8,  5,  4,  8,  8,
1393      7, 10,  9,  8, 11,  8,  8, 10, 11, 10, 11,  4,  5,  8,  4,  4,
1394      8,  8,  8, 10,  4,  4,  8,  4,  4,  7,  8,  7,  9,  8,  8, 10,
1395      7,  7,  9, 10,  9, 10,  8,  8, 11,  8,  7, 10, 11, 10, 12,  8,
1396      7, 10,  7,  7,  9, 10,  9, 11, 11, 10, 12, 10,  9, 11, 11, 10,
1397     11
1398 ];
1399 const AAC_SPEC_CB4_CODES: &[u16] = &[
1400     0x007, 0x016, 0x0f6, 0x018, 0x008, 0x0ef, 0x1ef, 0x0f3,
1401     0x7f8, 0x019, 0x017, 0x0ed, 0x015, 0x001, 0x0e2, 0x0f0,
1402     0x070, 0x3f0, 0x1ee, 0x0f1, 0x7fa, 0x0ee, 0x0e4, 0x3f2,
1403     0x7f6, 0x3ef, 0x7fd, 0x005, 0x014, 0x0f2, 0x009, 0x004,
1404     0x0e5, 0x0f4, 0x0e8, 0x3f4, 0x006, 0x002, 0x0e7, 0x003,
1405     0x000, 0x06b, 0x0e3, 0x069, 0x1f3, 0x0eb, 0x0e6, 0x3f6,
1406     0x06e, 0x06a, 0x1f4, 0x3ec, 0x1f0, 0x3f9, 0x0f5, 0x0ec,
1407     0x7fb, 0x0ea, 0x06f, 0x3f7, 0x7f9, 0x3f3, 0xfff, 0x0e9,
1408     0x06d, 0x3f8, 0x06c, 0x068, 0x1f5, 0x3ee, 0x1f2, 0x7f4,
1409     0x7f7, 0x3f1, 0xffe, 0x3ed, 0x1f1, 0x7f5, 0x7fe, 0x3f5,
1410     0x7fc
1411 ];
1412 const AAC_SPEC_CB5_BITS: &[u8] = &[
1413     13, 12, 11, 11, 10, 11, 11, 12, 13, 12, 11, 10,  9,  8,  9, 10,
1414     11, 12, 12, 10,  9,  8,  7,  8,  9, 10, 11, 11,  9,  8,  5,  4,
1415      5,  8,  9, 11, 10,  8,  7,  4,  1,  4,  7,  8, 11, 11,  9,  8,
1416      5,  4,  5,  8,  9, 11, 11, 10,  9,  8,  7,  8,  9, 10, 11, 12,
1417     11, 10,  9,  8,  9, 10, 11, 12, 13, 12, 12, 11, 10, 10, 11, 12,
1418     13
1419 ];
1420 const AAC_SPEC_CB5_CODES: &[u16] = &[
1421     0x1fff, 0x0ff7, 0x07f4, 0x07e8, 0x03f1, 0x07ee, 0x07f9, 0x0ff8,
1422     0x1ffd, 0x0ffd, 0x07f1, 0x03e8, 0x01e8, 0x00f0, 0x01ec, 0x03ee,
1423     0x07f2, 0x0ffa, 0x0ff4, 0x03ef, 0x01f2, 0x00e8, 0x0070, 0x00ec,
1424     0x01f0, 0x03ea, 0x07f3, 0x07eb, 0x01eb, 0x00ea, 0x001a, 0x0008,
1425     0x0019, 0x00ee, 0x01ef, 0x07ed, 0x03f0, 0x00f2, 0x0073, 0x000b,
1426     0x0000, 0x000a, 0x0071, 0x00f3, 0x07e9, 0x07ef, 0x01ee, 0x00ef,
1427     0x0018, 0x0009, 0x001b, 0x00eb, 0x01e9, 0x07ec, 0x07f6, 0x03eb,
1428     0x01f3, 0x00ed, 0x0072, 0x00e9, 0x01f1, 0x03ed, 0x07f7, 0x0ff6,
1429     0x07f0, 0x03e9, 0x01ed, 0x00f1, 0x01ea, 0x03ec, 0x07f8, 0x0ff9,
1430     0x1ffc, 0x0ffc, 0x0ff5, 0x07ea, 0x03f3, 0x03f2, 0x07f5, 0x0ffb,
1431     0x1ffe
1432 ];
1433 const AAC_SPEC_CB6_BITS: &[u8] = &[
1434     11, 10,  9,  9,  9,  9,  9, 10, 11, 10,  9,  8,  7,  7,  7,  8,
1435      9, 10,  9,  8,  6,  6,  6,  6,  6,  8,  9,  9,  7,  6,  4,  4,
1436      4,  6,  7,  9,  9,  7,  6,  4,  4,  4,  6,  7,  9,  9,  7,  6,
1437      4,  4,  4,  6,  7,  9,  9,  8,  6,  6,  6,  6,  6,  8,  9, 10,
1438      9,  8,  7,  7,  7,  7,  8, 10, 11, 10,  9,  9,  9,  9,  9, 10,
1439     11
1440 ];
1441 const AAC_SPEC_CB6_CODES: &[u16] = &[
1442     0x7fe, 0x3fd, 0x1f1, 0x1eb, 0x1f4, 0x1ea, 0x1f0, 0x3fc,
1443     0x7fd, 0x3f6, 0x1e5, 0x0ea, 0x06c, 0x071, 0x068, 0x0f0,
1444     0x1e6, 0x3f7, 0x1f3, 0x0ef, 0x032, 0x027, 0x028, 0x026,
1445     0x031, 0x0eb, 0x1f7, 0x1e8, 0x06f, 0x02e, 0x008, 0x004,
1446     0x006, 0x029, 0x06b, 0x1ee, 0x1ef, 0x072, 0x02d, 0x002,
1447     0x000, 0x003, 0x02f, 0x073, 0x1fa, 0x1e7, 0x06e, 0x02b,
1448     0x007, 0x001, 0x005, 0x02c, 0x06d, 0x1ec, 0x1f9, 0x0ee,
1449     0x030, 0x024, 0x02a, 0x025, 0x033, 0x0ec, 0x1f2, 0x3f8,
1450     0x1e4, 0x0ed, 0x06a, 0x070, 0x069, 0x074, 0x0f1, 0x3fa,
1451     0x7ff, 0x3f9, 0x1f6, 0x1ed, 0x1f8, 0x1e9, 0x1f5, 0x3fb,
1452     0x7fc
1453 ];
1454 const AAC_SPEC_CB7_BITS: &[u8] = &[
1455      1,  3,  6,  7,  8,  9, 10, 11,  3,  4,  6,  7,  8,  8,  9,  9,
1456      6,  6,  7,  8,  8,  9,  9, 10,  7,  7,  8,  8,  9,  9, 10, 10,
1457      8,  8,  9,  9, 10, 10, 10, 11,  9,  8,  9,  9, 10, 10, 11, 11,
1458     10,  9,  9, 10, 10, 11, 12, 12, 11, 10, 10, 10, 11, 11, 12, 12
1459 ];
1460 const AAC_SPEC_CB7_CODES: &[u16] = &[
1461     0x000, 0x005, 0x037, 0x074, 0x0f2, 0x1eb, 0x3ed, 0x7f7,
1462     0x004, 0x00c, 0x035, 0x071, 0x0ec, 0x0ee, 0x1ee, 0x1f5,
1463     0x036, 0x034, 0x072, 0x0ea, 0x0f1, 0x1e9, 0x1f3, 0x3f5,
1464     0x073, 0x070, 0x0eb, 0x0f0, 0x1f1, 0x1f0, 0x3ec, 0x3fa,
1465     0x0f3, 0x0ed, 0x1e8, 0x1ef, 0x3ef, 0x3f1, 0x3f9, 0x7fb,
1466     0x1ed, 0x0ef, 0x1ea, 0x1f2, 0x3f3, 0x3f8, 0x7f9, 0x7fc,
1467     0x3ee, 0x1ec, 0x1f4, 0x3f4, 0x3f7, 0x7f8, 0xffd, 0xffe,
1468     0x7f6, 0x3f0, 0x3f2, 0x3f6, 0x7fa, 0x7fd, 0xffc, 0xfff
1469 ];
1470 const AAC_SPEC_CB8_BITS: &[u8] = &[
1471      5,  4,  5,  6,  7,  8,  9, 10,  4,  3,  4,  5,  6,  7,  7,  8,
1472      5,  4,  4,  5,  6,  7,  7,  8,  6,  5,  5,  6,  6,  7,  8,  8,
1473      7,  6,  6,  6,  7,  7,  8,  9,  8,  7,  6,  7,  7,  8,  8, 10,
1474      9,  7,  7,  8,  8,  8,  9,  9, 10,  8,  8,  8,  9,  9,  9, 10
1475 ];
1476 const AAC_SPEC_CB8_CODES: &[u16] = &[
1477     0x00e, 0x005, 0x010, 0x030, 0x06f, 0x0f1, 0x1fa, 0x3fe,
1478     0x003, 0x000, 0x004, 0x012, 0x02c, 0x06a, 0x075, 0x0f8,
1479     0x00f, 0x002, 0x006, 0x014, 0x02e, 0x069, 0x072, 0x0f5,
1480     0x02f, 0x011, 0x013, 0x02a, 0x032, 0x06c, 0x0ec, 0x0fa,
1481     0x071, 0x02b, 0x02d, 0x031, 0x06d, 0x070, 0x0f2, 0x1f9,
1482     0x0ef, 0x068, 0x033, 0x06b, 0x06e, 0x0ee, 0x0f9, 0x3fc,
1483     0x1f8, 0x074, 0x073, 0x0ed, 0x0f0, 0x0f6, 0x1f6, 0x1fd,
1484     0x3fd, 0x0f3, 0x0f4, 0x0f7, 0x1f7, 0x1fb, 0x1fc, 0x3ff
1485 ];
1486 const AAC_SPEC_CB9_BITS: &[u8] = &[
1487      1,  3,  6,  8,  9, 10, 10, 11, 11, 12, 12, 13, 13,  3,  4,  6,
1488      7,  8,  8,  9, 10, 10, 10, 11, 12, 12,  6,  6,  7,  8,  8,  9,
1489     10, 10, 10, 11, 12, 12, 12,  8,  7,  8,  9,  9, 10, 10, 11, 11,
1490     11, 12, 12, 13,  9,  8,  9,  9, 10, 10, 11, 11, 11, 12, 12, 12,
1491     13, 10,  9,  9, 10, 11, 11, 11, 12, 11, 12, 12, 13, 13, 11,  9,
1492     10, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 11, 10, 10, 11, 11,
1493     12, 12, 13, 13, 13, 13, 13, 13, 11, 10, 10, 11, 11, 11, 12, 12,
1494     13, 13, 14, 13, 14, 11, 10, 11, 11, 12, 12, 12, 12, 13, 13, 14,
1495     14, 14, 12, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 12,
1496     11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 13, 12, 12, 12,
1497     13, 13, 13, 13, 14, 14, 14, 14, 15
1498 ];
1499 const AAC_SPEC_CB9_CODES: &[u16] = &[
1500     0x0000, 0x0005, 0x0037, 0x00e7, 0x01de, 0x03ce, 0x03d9, 0x07c8,
1501     0x07cd, 0x0fc8, 0x0fdd, 0x1fe4, 0x1fec, 0x0004, 0x000c, 0x0035,
1502     0x0072, 0x00ea, 0x00ed, 0x01e2, 0x03d1, 0x03d3, 0x03e0, 0x07d8,
1503     0x0fcf, 0x0fd5, 0x0036, 0x0034, 0x0071, 0x00e8, 0x00ec, 0x01e1,
1504     0x03cf, 0x03dd, 0x03db, 0x07d0, 0x0fc7, 0x0fd4, 0x0fe4, 0x00e6,
1505     0x0070, 0x00e9, 0x01dd, 0x01e3, 0x03d2, 0x03dc, 0x07cc, 0x07ca,
1506     0x07de, 0x0fd8, 0x0fea, 0x1fdb, 0x01df, 0x00eb, 0x01dc, 0x01e6,
1507     0x03d5, 0x03de, 0x07cb, 0x07dd, 0x07dc, 0x0fcd, 0x0fe2, 0x0fe7,
1508     0x1fe1, 0x03d0, 0x01e0, 0x01e4, 0x03d6, 0x07c5, 0x07d1, 0x07db,
1509     0x0fd2, 0x07e0, 0x0fd9, 0x0feb, 0x1fe3, 0x1fe9, 0x07c4, 0x01e5,
1510     0x03d7, 0x07c6, 0x07cf, 0x07da, 0x0fcb, 0x0fda, 0x0fe3, 0x0fe9,
1511     0x1fe6, 0x1ff3, 0x1ff7, 0x07d3, 0x03d8, 0x03e1, 0x07d4, 0x07d9,
1512     0x0fd3, 0x0fde, 0x1fdd, 0x1fd9, 0x1fe2, 0x1fea, 0x1ff1, 0x1ff6,
1513     0x07d2, 0x03d4, 0x03da, 0x07c7, 0x07d7, 0x07e2, 0x0fce, 0x0fdb,
1514     0x1fd8, 0x1fee, 0x3ff0, 0x1ff4, 0x3ff2, 0x07e1, 0x03df, 0x07c9,
1515     0x07d6, 0x0fca, 0x0fd0, 0x0fe5, 0x0fe6, 0x1feb, 0x1fef, 0x3ff3,
1516     0x3ff4, 0x3ff5, 0x0fe0, 0x07ce, 0x07d5, 0x0fc6, 0x0fd1, 0x0fe1,
1517     0x1fe0, 0x1fe8, 0x1ff0, 0x3ff1, 0x3ff8, 0x3ff6, 0x7ffc, 0x0fe8,
1518     0x07df, 0x0fc9, 0x0fd7, 0x0fdc, 0x1fdc, 0x1fdf, 0x1fed, 0x1ff5,
1519     0x3ff9, 0x3ffb, 0x7ffd, 0x7ffe, 0x1fe7, 0x0fcc, 0x0fd6, 0x0fdf,
1520     0x1fde, 0x1fda, 0x1fe5, 0x1ff2, 0x3ffa, 0x3ff7, 0x3ffc, 0x3ffd,
1521     0x7fff
1522 ];
1523 const AAC_SPEC_CB10_BITS: &[u8] = &[
1524      6,  5,  6,  6,  7,  8,  9, 10, 10, 10, 11, 11, 12,  5,  4,  4,
1525      5,  6,  7,  7,  8,  8,  9, 10, 10, 11,  6,  4,  5,  5,  6,  6,
1526      7,  8,  8,  9,  9, 10, 10,  6,  5,  5,  5,  6,  7,  7,  8,  8,
1527      9,  9, 10, 10,  7,  6,  6,  6,  6,  7,  7,  8,  8,  9,  9, 10,
1528     10,  8,  7,  6,  7,  7,  7,  8,  8,  8,  9, 10, 10, 11,  9,  7,
1529      7,  7,  7,  8,  8,  9,  9,  9, 10, 10, 11,  9,  8,  8,  8,  8,
1530      8,  9,  9,  9, 10, 10, 11, 11,  9,  8,  8,  8,  8,  8,  9,  9,
1531     10, 10, 10, 11, 11, 10,  9,  9,  9,  9,  9,  9, 10, 10, 10, 11,
1532     11, 12, 10,  9,  9,  9,  9, 10, 10, 10, 10, 11, 11, 11, 12, 11,
1533     10,  9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 11, 10, 10, 10,
1534     10, 10, 10, 11, 11, 12, 12, 12, 12
1535 ];
1536 const AAC_SPEC_CB10_CODES: &[u16] = &[
1537     0x022, 0x008, 0x01d, 0x026, 0x05f, 0x0d3, 0x1cf, 0x3d0,
1538     0x3d7, 0x3ed, 0x7f0, 0x7f6, 0xffd, 0x007, 0x000, 0x001,
1539     0x009, 0x020, 0x054, 0x060, 0x0d5, 0x0dc, 0x1d4, 0x3cd,
1540     0x3de, 0x7e7, 0x01c, 0x002, 0x006, 0x00c, 0x01e, 0x028,
1541     0x05b, 0x0cd, 0x0d9, 0x1ce, 0x1dc, 0x3d9, 0x3f1, 0x025,
1542     0x00b, 0x00a, 0x00d, 0x024, 0x057, 0x061, 0x0cc, 0x0dd,
1543     0x1cc, 0x1de, 0x3d3, 0x3e7, 0x05d, 0x021, 0x01f, 0x023,
1544     0x027, 0x059, 0x064, 0x0d8, 0x0df, 0x1d2, 0x1e2, 0x3dd,
1545     0x3ee, 0x0d1, 0x055, 0x029, 0x056, 0x058, 0x062, 0x0ce,
1546     0x0e0, 0x0e2, 0x1da, 0x3d4, 0x3e3, 0x7eb, 0x1c9, 0x05e,
1547     0x05a, 0x05c, 0x063, 0x0ca, 0x0da, 0x1c7, 0x1ca, 0x1e0,
1548     0x3db, 0x3e8, 0x7ec, 0x1e3, 0x0d2, 0x0cb, 0x0d0, 0x0d7,
1549     0x0db, 0x1c6, 0x1d5, 0x1d8, 0x3ca, 0x3da, 0x7ea, 0x7f1,
1550     0x1e1, 0x0d4, 0x0cf, 0x0d6, 0x0de, 0x0e1, 0x1d0, 0x1d6,
1551     0x3d1, 0x3d5, 0x3f2, 0x7ee, 0x7fb, 0x3e9, 0x1cd, 0x1c8,
1552     0x1cb, 0x1d1, 0x1d7, 0x1df, 0x3cf, 0x3e0, 0x3ef, 0x7e6,
1553     0x7f8, 0xffa, 0x3eb, 0x1dd, 0x1d3, 0x1d9, 0x1db, 0x3d2,
1554     0x3cc, 0x3dc, 0x3ea, 0x7ed, 0x7f3, 0x7f9, 0xff9, 0x7f2,
1555     0x3ce, 0x1e4, 0x3cb, 0x3d8, 0x3d6, 0x3e2, 0x3e5, 0x7e8,
1556     0x7f4, 0x7f5, 0x7f7, 0xffb, 0x7fa, 0x3ec, 0x3df, 0x3e1,
1557     0x3e4, 0x3e6, 0x3f0, 0x7e9, 0x7ef, 0xff8, 0xffe, 0xffc,
1558     0xfff
1559 ];
1560 const AAC_SPEC_CB11_BITS: &[u8] = &[
1561      4,  5,  6,  7,  8,  8,  9, 10, 10, 10, 11, 11, 12, 11, 12, 12,
1562     10,  5,  4,  5,  6,  7,  7,  8,  8,  9,  9,  9, 10, 10, 10, 10,
1563     11,  8,  6,  5,  5,  6,  7,  7,  8,  8,  8,  9,  9,  9, 10, 10,
1564     10, 10,  8,  7,  6,  6,  6,  7,  7,  8,  8,  8,  9,  9,  9, 10,
1565     10, 10, 10,  8,  8,  7,  7,  7,  7,  8,  8,  8,  8,  9,  9,  9,
1566     10, 10, 10, 10,  8,  8,  7,  7,  7,  7,  8,  8,  8,  9,  9,  9,
1567      9, 10, 10, 10, 10,  8,  9,  8,  8,  8,  8,  8,  8,  8,  9,  9,
1568      9, 10, 10, 10, 10, 10,  8,  9,  8,  8,  8,  8,  8,  8,  9,  9,
1569      9, 10, 10, 10, 10, 10, 10,  8, 10,  9,  8,  8,  9,  9,  9,  9,
1570      9, 10, 10, 10, 10, 10, 10, 11,  8, 10,  9,  9,  9,  9,  9,  9,
1571      9, 10, 10, 10, 10, 10, 10, 11, 11,  8, 11,  9,  9,  9,  9,  9,
1572      9, 10, 10, 10, 10, 10, 11, 10, 11, 11,  8, 11, 10,  9,  9, 10,
1573      9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11,  8, 11, 10, 10, 10,
1574     10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11,  9, 11, 10,  9,
1575      9, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11,  9, 11, 10,
1576     10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11,  9, 12,
1577     10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 12, 12,  9,
1578      9,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  9,
1579      5
1580 ];
1581 const AAC_SPEC_CB11_CODES: &[u16] = &[
1582     0x000, 0x006, 0x019, 0x03d, 0x09c, 0x0c6, 0x1a7, 0x390,
1583     0x3c2, 0x3df, 0x7e6, 0x7f3, 0xffb, 0x7ec, 0xffa, 0xffe,
1584     0x38e, 0x005, 0x001, 0x008, 0x014, 0x037, 0x042, 0x092,
1585     0x0af, 0x191, 0x1a5, 0x1b5, 0x39e, 0x3c0, 0x3a2, 0x3cd,
1586     0x7d6, 0x0ae, 0x017, 0x007, 0x009, 0x018, 0x039, 0x040,
1587     0x08e, 0x0a3, 0x0b8, 0x199, 0x1ac, 0x1c1, 0x3b1, 0x396,
1588     0x3be, 0x3ca, 0x09d, 0x03c, 0x015, 0x016, 0x01a, 0x03b,
1589     0x044, 0x091, 0x0a5, 0x0be, 0x196, 0x1ae, 0x1b9, 0x3a1,
1590     0x391, 0x3a5, 0x3d5, 0x094, 0x09a, 0x036, 0x038, 0x03a,
1591     0x041, 0x08c, 0x09b, 0x0b0, 0x0c3, 0x19e, 0x1ab, 0x1bc,
1592     0x39f, 0x38f, 0x3a9, 0x3cf, 0x093, 0x0bf, 0x03e, 0x03f,
1593     0x043, 0x045, 0x09e, 0x0a7, 0x0b9, 0x194, 0x1a2, 0x1ba,
1594     0x1c3, 0x3a6, 0x3a7, 0x3bb, 0x3d4, 0x09f, 0x1a0, 0x08f,
1595     0x08d, 0x090, 0x098, 0x0a6, 0x0b6, 0x0c4, 0x19f, 0x1af,
1596     0x1bf, 0x399, 0x3bf, 0x3b4, 0x3c9, 0x3e7, 0x0a8, 0x1b6,
1597     0x0ab, 0x0a4, 0x0aa, 0x0b2, 0x0c2, 0x0c5, 0x198, 0x1a4,
1598     0x1b8, 0x38c, 0x3a4, 0x3c4, 0x3c6, 0x3dd, 0x3e8, 0x0ad,
1599     0x3af, 0x192, 0x0bd, 0x0bc, 0x18e, 0x197, 0x19a, 0x1a3,
1600     0x1b1, 0x38d, 0x398, 0x3b7, 0x3d3, 0x3d1, 0x3db, 0x7dd,
1601     0x0b4, 0x3de, 0x1a9, 0x19b, 0x19c, 0x1a1, 0x1aa, 0x1ad,
1602     0x1b3, 0x38b, 0x3b2, 0x3b8, 0x3ce, 0x3e1, 0x3e0, 0x7d2,
1603     0x7e5, 0x0b7, 0x7e3, 0x1bb, 0x1a8, 0x1a6, 0x1b0, 0x1b2,
1604     0x1b7, 0x39b, 0x39a, 0x3ba, 0x3b5, 0x3d6, 0x7d7, 0x3e4,
1605     0x7d8, 0x7ea, 0x0ba, 0x7e8, 0x3a0, 0x1bd, 0x1b4, 0x38a,
1606     0x1c4, 0x392, 0x3aa, 0x3b0, 0x3bc, 0x3d7, 0x7d4, 0x7dc,
1607     0x7db, 0x7d5, 0x7f0, 0x0c1, 0x7fb, 0x3c8, 0x3a3, 0x395,
1608     0x39d, 0x3ac, 0x3ae, 0x3c5, 0x3d8, 0x3e2, 0x3e6, 0x7e4,
1609     0x7e7, 0x7e0, 0x7e9, 0x7f7, 0x190, 0x7f2, 0x393, 0x1be,
1610     0x1c0, 0x394, 0x397, 0x3ad, 0x3c3, 0x3c1, 0x3d2, 0x7da,
1611     0x7d9, 0x7df, 0x7eb, 0x7f4, 0x7fa, 0x195, 0x7f8, 0x3bd,
1612     0x39c, 0x3ab, 0x3a8, 0x3b3, 0x3b9, 0x3d0, 0x3e3, 0x3e5,
1613     0x7e2, 0x7de, 0x7ed, 0x7f1, 0x7f9, 0x7fc, 0x193, 0xffd,
1614     0x3dc, 0x3b6, 0x3c7, 0x3cc, 0x3cb, 0x3d9, 0x3da, 0x7d3,
1615     0x7e1, 0x7ee, 0x7ef, 0x7f5, 0x7f6, 0xffc, 0xfff, 0x19d,
1616     0x1c2, 0x0b5, 0x0a1, 0x096, 0x097, 0x095, 0x099, 0x0a0,
1617     0x0a2, 0x0ac, 0x0a9, 0x0b1, 0x0b3, 0x0bb, 0x0c0, 0x18f,
1618     0x004
1619 ];
1620
1621 const AAC_SPEC_BITS: [&[u8]; 11] = [
1622     AAC_SPEC_CB1_BITS, AAC_SPEC_CB2_BITS, AAC_SPEC_CB3_BITS, AAC_SPEC_CB4_BITS,
1623     AAC_SPEC_CB5_BITS, AAC_SPEC_CB6_BITS, AAC_SPEC_CB7_BITS, AAC_SPEC_CB8_BITS,
1624     AAC_SPEC_CB9_BITS, AAC_SPEC_CB10_BITS, AAC_SPEC_CB11_BITS
1625 ];
1626 const AAC_SPEC_CODES: [&[u16]; 11] = [
1627     AAC_SPEC_CB1_CODES, AAC_SPEC_CB2_CODES, AAC_SPEC_CB3_CODES, AAC_SPEC_CB4_CODES,
1628     AAC_SPEC_CB5_CODES, AAC_SPEC_CB6_CODES, AAC_SPEC_CB7_CODES, AAC_SPEC_CB8_CODES,
1629     AAC_SPEC_CB9_CODES, AAC_SPEC_CB10_CODES, AAC_SPEC_CB11_CODES
1630 ];
1631 const AAC_UNSIGNED_CODEBOOK: [bool; 11] = [
1632     false, false, true, true, false, false, true, true, true, true, true
1633 ];
1634 const AAC_CODEBOOK_MODULO: [u16; 7] = [
1635     9, 9, 8, 8, 13, 13, 17
1636 ];
1637
1638 const AAC_QUADS: [[i8; 4]; 81] = [
1639     [ 0, 0, 0, 0 ], [ 0, 0, 0, 1 ], [ 0, 0, 0, 2 ],
1640     [ 0, 0, 1, 0 ], [ 0, 0, 1, 1 ], [ 0, 0, 1, 2 ],
1641     [ 0, 0, 2, 0 ], [ 0, 0, 2, 1 ], [ 0, 0, 2, 2 ],
1642     [ 0, 1, 0, 0 ], [ 0, 1, 0, 1 ], [ 0, 1, 0, 2 ],
1643     [ 0, 1, 1, 0 ], [ 0, 1, 1, 1 ], [ 0, 1, 1, 2 ],
1644     [ 0, 1, 2, 0 ], [ 0, 1, 2, 1 ], [ 0, 1, 2, 2 ],
1645     [ 0, 2, 0, 0 ], [ 0, 2, 0, 1 ], [ 0, 2, 0, 2 ],
1646     [ 0, 2, 1, 0 ], [ 0, 2, 1, 1 ], [ 0, 2, 1, 2 ],
1647     [ 0, 2, 2, 0 ], [ 0, 2, 2, 1 ], [ 0, 2, 2, 2 ],
1648     [ 1, 0, 0, 0 ], [ 1, 0, 0, 1 ], [ 1, 0, 0, 2 ],
1649     [ 1, 0, 1, 0 ], [ 1, 0, 1, 1 ], [ 1, 0, 1, 2 ],
1650     [ 1, 0, 2, 0 ], [ 1, 0, 2, 1 ], [ 1, 0, 2, 2 ],
1651     [ 1, 1, 0, 0 ], [ 1, 1, 0, 1 ], [ 1, 1, 0, 2 ],
1652     [ 1, 1, 1, 0 ], [ 1, 1, 1, 1 ], [ 1, 1, 1, 2 ],
1653     [ 1, 1, 2, 0 ], [ 1, 1, 2, 1 ], [ 1, 1, 2, 2 ],
1654     [ 1, 2, 0, 0 ], [ 1, 2, 0, 1 ], [ 1, 2, 0, 2 ],
1655     [ 1, 2, 1, 0 ], [ 1, 2, 1, 1 ], [ 1, 2, 1, 2 ],
1656     [ 1, 2, 2, 0 ], [ 1, 2, 2, 1 ], [ 1, 2, 2, 2 ],
1657     [ 2, 0, 0, 0 ], [ 2, 0, 0, 1 ], [ 2, 0, 0, 2 ],
1658     [ 2, 0, 1, 0 ], [ 2, 0, 1, 1 ], [ 2, 0, 1, 2 ],
1659     [ 2, 0, 2, 0 ], [ 2, 0, 2, 1 ], [ 2, 0, 2, 2 ],
1660     [ 2, 1, 0, 0 ], [ 2, 1, 0, 1 ], [ 2, 1, 0, 2 ],
1661     [ 2, 1, 1, 0 ], [ 2, 1, 1, 1 ], [ 2, 1, 1, 2 ],
1662     [ 2, 1, 2, 0 ], [ 2, 1, 2, 1 ], [ 2, 1, 2, 2 ],
1663     [ 2, 2, 0, 0 ], [ 2, 2, 0, 1 ], [ 2, 2, 0, 2 ],
1664     [ 2, 2, 1, 0 ], [ 2, 2, 1, 1 ], [ 2, 2, 1, 2 ],
1665     [ 2, 2, 2, 0 ], [ 2, 2, 2, 1 ], [ 2, 2, 2, 2 ],
1666 ];
1667
1668 const DEFAULT_CHANNEL_MAP: [&str; 9] = [
1669     "",
1670     "C",
1671     "L,R",
1672     "C,L,R",
1673     "C,L,R,Cs",
1674     "C,L,R,Ls,Rs",
1675     "C,L,R,Ls,Rs,LFE",
1676     "",
1677     "C,L,R,Ls,Rs,Lss,Rss,LFE",
1678 ];
1679
1680 const SWB_OFFSET_48K_LONG: [usize; 49+1] = [
1681       0,   4,   8,  12,  16,  20,  24,  28,
1682      32,  36,  40,  48,  56,  64,  72,  80,
1683      88,  96, 108, 120, 132, 144, 160, 176,
1684     196, 216, 240, 264, 292, 320, 352, 384,
1685     416, 448, 480, 512, 544, 576, 608, 640,
1686     672, 704, 736, 768, 800, 832, 864, 896,
1687     928, 1024
1688 ];
1689 const SWB_OFFSET_48K_SHORT: [usize; 14+1] = [
1690     0, 4, 8, 12, 16, 20, 28, 36, 44, 56, 68, 80, 96, 112, 128
1691 ];
1692 const SWB_OFFSET_32K_LONG: [usize; 51+1] = [
1693       0,   4,   8,  12,  16,  20,  24,  28,
1694      32,  36,  40,  48,  56,  64,  72,  80,
1695      88,  96, 108, 120, 132, 144, 160, 176,
1696     196, 216, 240, 264, 292, 320, 352, 384,
1697     416, 448, 480, 512, 544, 576, 608, 640,
1698     672, 704, 736, 768, 800, 832, 864, 896,
1699     928, 960, 992, 1024
1700 ];
1701 const SWB_OFFSET_8K_LONG: [usize; 40+1] = [
1702       0,  12,  24,  36,  48,  60,  72,  84,
1703      96, 108, 120, 132, 144, 156, 172, 188,
1704     204, 220, 236, 252, 268, 288, 308, 328,
1705     348, 372, 396, 420, 448, 476, 508, 544,
1706     580, 620, 664, 712, 764, 820, 880, 944,
1707     1024
1708 ];
1709 const SWB_OFFSET_8K_SHORT: [usize; 15+1] = [
1710     0, 4, 8, 12, 16, 20, 24, 28, 36, 44, 52, 60, 72, 88, 108, 128
1711 ];
1712 const SWB_OFFSET_16K_LONG: [usize; 43+1] = [
1713       0,   8,  16,  24,  32,  40,  48,  56,
1714      64,  72,  80,  88, 100, 112, 124, 136,
1715     148, 160, 172, 184, 196, 212, 228, 244,
1716     260, 280, 300, 320, 344, 368, 396, 424,
1717     456, 492, 532, 572, 616, 664, 716, 772,
1718     832, 896, 960, 1024
1719 ];
1720 const SWB_OFFSET_16K_SHORT: [usize; 15+1] = [
1721     0, 4, 8, 12, 16, 20, 24, 28, 32, 40, 48, 60, 72, 88, 108, 128
1722 ];
1723 const SWB_OFFSET_24K_LONG: [usize; 47+1] = [
1724       0,   4,   8,  12,  16,  20,  24,  28,
1725      32,  36,  40,  44,  52,  60,  68,  76,
1726      84,  92, 100, 108, 116, 124, 136, 148,
1727     160, 172, 188, 204, 220, 240, 260, 284,
1728     308, 336, 364, 396, 432, 468, 508, 552,
1729     600, 652, 704, 768, 832, 896, 960, 1024
1730 ];
1731 const SWB_OFFSET_24K_SHORT: [usize; 15+1] = [
1732     0, 4, 8, 12, 16, 20, 24, 28, 36, 44, 52, 64, 76, 92, 108, 128
1733 ];
1734 const SWB_OFFSET_64K_LONG: [usize; 47+1] = [
1735       0,   4,   8,  12,  16,  20,  24,  28,
1736      32,  36,  40,  44,  48,  52,  56,  64,
1737      72,  80,  88, 100, 112, 124, 140, 156,
1738     172, 192, 216, 240, 268, 304, 344, 384,
1739     424, 464, 504, 544, 584, 624, 664, 704,
1740     744, 784, 824, 864, 904, 944, 984, 1024
1741 ];
1742 const SWB_OFFSET_64K_SHORT: [usize; 12+1] = [
1743     0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128
1744 ];
1745 const SWB_OFFSET_96K_LONG: [usize; 41+1] = [
1746       0,   4,   8,  12,  16,  20,  24,  28,
1747      32,  36,  40,  44,  48,  52,  56,  64,
1748      72,  80,  88,  96, 108, 120, 132, 144,
1749     156, 172, 188, 212, 240, 276, 320, 384,
1750     448, 512, 576, 640, 704, 768, 832, 896,
1751     960, 1024
1752 ];
1753
1754 #[derive(Clone,Copy)]
1755 struct GASubbandInfo {
1756     min_srate:     u32,
1757     long_bands:    &'static [usize],
1758     short_bands:   &'static [usize],
1759 }
1760
1761 impl GASubbandInfo {
1762     fn find(srate: u32) -> GASubbandInfo {
1763         for sbi in AAC_SUBBAND_INFO.iter() {
1764             if srate >= sbi.min_srate {
1765                 return *sbi;
1766             }
1767         }
1768         unreachable!("")
1769     }
1770     fn find_idx(srate: u32) -> usize {
1771         for (i, sbi) in AAC_SUBBAND_INFO.iter().enumerate() {
1772             if srate >= sbi.min_srate {
1773                 return i;
1774             }
1775         }
1776         unreachable!("")
1777     }
1778 }
1779
1780 const AAC_SUBBAND_INFO: [GASubbandInfo; 12] = [
1781     GASubbandInfo { min_srate: 92017, long_bands: &SWB_OFFSET_96K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //96K
1782     GASubbandInfo { min_srate: 75132, long_bands: &SWB_OFFSET_96K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //88.2K
1783     GASubbandInfo { min_srate: 55426, long_bands: &SWB_OFFSET_64K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //64K
1784     GASubbandInfo { min_srate: 46009, long_bands: &SWB_OFFSET_48K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //48K
1785     GASubbandInfo { min_srate: 37566, long_bands: &SWB_OFFSET_48K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //44.1K
1786     GASubbandInfo { min_srate: 27713, long_bands: &SWB_OFFSET_32K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //32K
1787     GASubbandInfo { min_srate: 23004, long_bands: &SWB_OFFSET_24K_LONG, short_bands: &SWB_OFFSET_24K_SHORT }, //24K
1788     GASubbandInfo { min_srate: 18783, long_bands: &SWB_OFFSET_24K_LONG, short_bands: &SWB_OFFSET_24K_SHORT }, //22.05K
1789     GASubbandInfo { min_srate: 13856, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //16K
1790     GASubbandInfo { min_srate: 11502, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //12K
1791     GASubbandInfo { min_srate:  9391, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //11.025K
1792     GASubbandInfo { min_srate:     0, long_bands: &SWB_OFFSET_8K_LONG,  short_bands: &SWB_OFFSET_8K_SHORT  }, //8K
1793 ];