| 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 | ]; |