| 1 | use nihav_core::codecs::*; |
| 2 | use nihav_core::io::byteio::*; |
| 3 | use nihav_core::io::bitreader::*; |
| 4 | use nihav_core::io::intcode::*; |
| 5 | |
| 6 | const MAX_SAMPLES: usize = 32768; |
| 7 | |
| 8 | #[derive(Clone,Copy,PartialEq)] |
| 9 | enum StereoMode { |
| 10 | Normal, |
| 11 | LeftSide, |
| 12 | SideRight, |
| 13 | MidSide, |
| 14 | } |
| 15 | |
| 16 | struct FlacDecoder { |
| 17 | ainfo: NAAudioInfo, |
| 18 | chmap: NAChannelMap, |
| 19 | min_blk_size: usize, |
| 20 | max_blk_size: usize, |
| 21 | min_frm_size: usize, |
| 22 | max_frm_size: usize, |
| 23 | channels: u8, |
| 24 | bits: u8, |
| 25 | srate: u32, |
| 26 | residues: [Vec<i32>; 8], |
| 27 | } |
| 28 | |
| 29 | fn decode_partition(br: &mut BitReader, dst: &mut [i32], k: u8) -> DecoderResult<()> { |
| 30 | for el in dst.iter_mut() { |
| 31 | let val = br.read_code(UintCodeType::Rice(k))?; |
| 32 | if (val & 1) == 0 { |
| 33 | *el = (val >> 1) as i32; |
| 34 | } else { |
| 35 | *el = -(((val + 1) >> 1) as i32); |
| 36 | } |
| 37 | } |
| 38 | Ok(()) |
| 39 | } |
| 40 | |
| 41 | fn decode_residual(br: &mut BitReader, dst: &mut [i32], order: usize) -> DecoderResult<()> { |
| 42 | let mode = br.read(2)?; |
| 43 | validate!(mode < 2); |
| 44 | let rice_k = if mode == 0 { 4 } else { 5 }; |
| 45 | let esc = (1 << rice_k) - 1; |
| 46 | |
| 47 | let num_partitions = 1 << br.read(4)?; |
| 48 | let tot_size = dst.len() + order; |
| 49 | validate!((tot_size % num_partitions) == 0); |
| 50 | let psize = tot_size / num_partitions; |
| 51 | validate!(psize >= order); |
| 52 | let mut off = psize - order; |
| 53 | let k = br.read(rice_k)? as u8; |
| 54 | if k != esc { |
| 55 | decode_partition(br, &mut dst[..off], k)?; |
| 56 | } else { |
| 57 | let bits = br.read(5)? as u8; |
| 58 | for el in dst.iter_mut().take(off) { |
| 59 | *el = br.read_s(bits)?; |
| 60 | } |
| 61 | } |
| 62 | for _ in 1..num_partitions { |
| 63 | let k = br.read(rice_k)? as u8; |
| 64 | if k != esc { |
| 65 | decode_partition(br, &mut dst[off..][..psize], k)?; |
| 66 | } else { |
| 67 | let bits = br.read(5)? as u8; |
| 68 | for el in dst[off..].iter_mut().take(psize) { |
| 69 | *el = br.read_s(bits)?; |
| 70 | } |
| 71 | } |
| 72 | off += psize; |
| 73 | } |
| 74 | |
| 75 | Ok(()) |
| 76 | } |
| 77 | |
| 78 | fn apply_fixed_predictor(dst: &mut [i32], order: usize) { |
| 79 | match order { |
| 80 | 1 => { |
| 81 | let mut last = dst[0]; |
| 82 | for el in dst.iter_mut().skip(1) { |
| 83 | *el += last; |
| 84 | last = *el; |
| 85 | } |
| 86 | }, |
| 87 | 2 => { |
| 88 | let mut last0 = dst[1]; |
| 89 | let mut last1 = last0 - dst[0]; |
| 90 | for el in dst.iter_mut().skip(2) { |
| 91 | last1 += *el; |
| 92 | last0 += last1; |
| 93 | *el = last0; |
| 94 | } |
| 95 | }, |
| 96 | 3 => { |
| 97 | let mut last0 = dst[2]; |
| 98 | let mut last1 = last0 - dst[1]; |
| 99 | let mut last2 = last1 - dst[1] + dst[0]; |
| 100 | for el in dst.iter_mut().skip(3) { |
| 101 | last2 += *el; |
| 102 | last1 += last2; |
| 103 | last0 += last1; |
| 104 | *el = last0; |
| 105 | } |
| 106 | }, |
| 107 | 4 => { |
| 108 | let mut last0 = dst[3]; |
| 109 | let mut last1 = last0 - dst[2]; |
| 110 | let mut last2 = last1 - dst[2] + dst[1]; |
| 111 | let mut last3 = last2 - dst[2] + 2 * dst[1] - dst[0]; |
| 112 | for el in dst.iter_mut().skip(4) { |
| 113 | last3 += *el; |
| 114 | last2 += last3; |
| 115 | last1 += last2; |
| 116 | last0 += last1; |
| 117 | *el = last0; |
| 118 | } |
| 119 | }, |
| 120 | _ => unreachable!(), |
| 121 | }; |
| 122 | } |
| 123 | |
| 124 | fn apply_lpc(dst: &mut [i32], filt: &[i32; 32], order: usize, shift: u8) { |
| 125 | for i in order..dst.len() { |
| 126 | let mut sum = 0i64; |
| 127 | for (coef, filt) in dst[i - order..].iter().take(order).zip(filt.iter()) { |
| 128 | sum += i64::from(*coef) * i64::from(*filt); |
| 129 | } |
| 130 | dst[i] += (sum >> shift) as i32; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | impl FlacDecoder { |
| 135 | fn new() -> Self { |
| 136 | Self { |
| 137 | ainfo: NAAudioInfo::new(0, 1, SND_S16P_FORMAT, 0), |
| 138 | chmap: NAChannelMap::new(), |
| 139 | min_blk_size: 0, |
| 140 | max_blk_size: 0, |
| 141 | min_frm_size: 0, |
| 142 | max_frm_size: 0, |
| 143 | channels: 0, |
| 144 | bits: 0, |
| 145 | srate: 0, |
| 146 | residues: [vec![0; MAX_SAMPLES], vec![0; MAX_SAMPLES], |
| 147 | vec![0; MAX_SAMPLES], vec![0; MAX_SAMPLES], |
| 148 | vec![0; MAX_SAMPLES], vec![0; MAX_SAMPLES], |
| 149 | vec![0; MAX_SAMPLES], vec![0; MAX_SAMPLES]], |
| 150 | } |
| 151 | } |
| 152 | fn apply_chmod(&mut self, blocksize: usize, chmod: StereoMode) { |
| 153 | match chmod { |
| 154 | StereoMode::Normal => {}, |
| 155 | StereoMode::LeftSide => { |
| 156 | for i in 0..blocksize { |
| 157 | self.residues[1][i] = self.residues[0][i].wrapping_sub(self.residues[1][i]); |
| 158 | } |
| 159 | }, |
| 160 | StereoMode::SideRight => { |
| 161 | for i in 0..blocksize { |
| 162 | self.residues[0][i] = self.residues[0][i].wrapping_add(self.residues[1][i]); |
| 163 | } |
| 164 | }, |
| 165 | StereoMode::MidSide => { |
| 166 | for i in 0..blocksize { |
| 167 | let r = self.residues[0][i].wrapping_sub(self.residues[1][i] >> 1); |
| 168 | self.residues[0][i] = self.residues[1][i].wrapping_add(r); |
| 169 | self.residues[1][i] = r; |
| 170 | } |
| 171 | }, |
| 172 | }; |
| 173 | } |
| 174 | fn decode_subframe(&mut self, br: &mut BitReader, channel: usize, blocksize: usize, mut samp_bits: u8) -> DecoderResult<()> { |
| 175 | let marker = br.read(1)?; |
| 176 | validate!(marker == 0); |
| 177 | let sftype = br.read(6)?; |
| 178 | |
| 179 | if br.read_bool()? { |
| 180 | let nbits = br.read_code(UintCodeType::UnaryZeroes)?; |
| 181 | validate!(nbits < 32 && samp_bits > nbits as u8); |
| 182 | samp_bits -= nbits as u8; |
| 183 | } |
| 184 | |
| 185 | let dst = &mut self.residues[channel][..blocksize]; |
| 186 | match sftype { |
| 187 | 0x00 => { |
| 188 | let val = br.read_s(samp_bits)?; |
| 189 | for el in dst.iter_mut() { |
| 190 | *el = val; |
| 191 | } |
| 192 | }, |
| 193 | 0x01 => { |
| 194 | for el in dst.iter_mut() { |
| 195 | *el = br.read_s(samp_bits)?; |
| 196 | } |
| 197 | }, |
| 198 | 0x08..=0x0C => { |
| 199 | let order = (sftype - 0x08) as usize; |
| 200 | for el in dst.iter_mut().take(order) { |
| 201 | *el = br.read_s(samp_bits)?; |
| 202 | } |
| 203 | decode_residual(br, &mut dst[order..], order)?; |
| 204 | if order > 0 { |
| 205 | apply_fixed_predictor(dst, order); |
| 206 | } |
| 207 | }, |
| 208 | 0x20..=0x3F => { |
| 209 | let order = (sftype - 0x20) as usize + 1; |
| 210 | for el in dst.iter_mut().take(order) { |
| 211 | *el = br.read_s(samp_bits)?; |
| 212 | } |
| 213 | let precision = br.read(4)? as u8 + 1; |
| 214 | validate!(precision < 16); |
| 215 | let shift = br.read(5)? as u8; |
| 216 | let mut filter = [0i32; 32]; |
| 217 | for el in filter[..order].iter_mut().rev() { |
| 218 | *el = br.read_s(precision)?; |
| 219 | } |
| 220 | decode_residual(br, &mut dst[order..], order)?; |
| 221 | apply_lpc(dst, &filter, order, shift); |
| 222 | }, |
| 223 | _ => return Err(DecoderError::InvalidData), |
| 224 | }; |
| 225 | |
| 226 | Ok(()) |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | impl NADecoder for FlacDecoder { |
| 231 | fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> { |
| 232 | const DEFAULT_CHANNEL_MAPS: [&str; 8] = [ |
| 233 | "C", |
| 234 | "L,R", |
| 235 | "L,R,C", |
| 236 | "L,R,Ls,Rs", |
| 237 | "L,R,C,Ls,Rs", |
| 238 | "L,R,C,LFE,Ls,Rs", |
| 239 | "L,R,C,LFE,Cs,Ls,Rs", |
| 240 | "L,R,C,LFE,Ls,Rs,Lss,Rss" |
| 241 | ]; |
| 242 | if let NACodecTypeInfo::Audio(_ainfo) = info.get_properties() { |
| 243 | if let Some(buf) = info.get_extradata() { |
| 244 | validate!(buf.len() >= 22); |
| 245 | |
| 246 | let mut mr = MemoryReader::new_read(&buf); |
| 247 | let mut br = ByteReader::new(&mut mr); |
| 248 | |
| 249 | self.min_blk_size = br.read_u16be()? as usize; |
| 250 | self.max_blk_size = br.read_u16be()? as usize; |
| 251 | self.min_frm_size = br.read_u24be()? as usize; |
| 252 | self.max_frm_size = br.read_u24be()? as usize; |
| 253 | let tmp = br.read_u64be()?; |
| 254 | self.srate = (tmp >> 44) as u32; |
| 255 | self.channels = (((tmp >> 41) & 7) + 1) as u8; |
| 256 | self.bits = (((tmp >> 36) & 0x1F) + 1) as u8; |
| 257 | //let tot_samples = tmp & ((1 << 36) - 1); |
| 258 | |
| 259 | self.chmap = NAChannelMap::from_str(DEFAULT_CHANNEL_MAPS[(self.channels - 1) as usize]).unwrap(); |
| 260 | let fmt = match self.bits { |
| 261 | 8 | 12 | 16 => SND_S16P_FORMAT, |
| 262 | 24 => SND_S32P_FORMAT, |
| 263 | _ => return Err(DecoderError::NotImplemented), |
| 264 | }; |
| 265 | |
| 266 | self.ainfo = NAAudioInfo::new(self.srate, self.channels as u8, fmt, self.max_blk_size.max(1)); |
| 267 | Ok(()) |
| 268 | } else { |
| 269 | Err(DecoderError::InvalidData) |
| 270 | } |
| 271 | } else { |
| 272 | Err(DecoderError::InvalidData) |
| 273 | } |
| 274 | } |
| 275 | fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> { |
| 276 | let info = pkt.get_stream().get_info(); |
| 277 | if let NACodecTypeInfo::Audio(_) = info.get_properties() { |
| 278 | let pktbuf = pkt.get_buffer(); |
| 279 | validate!(pktbuf.len() >= 9.max(self.min_frm_size)); |
| 280 | |
| 281 | let ref_crc = read_u16be(&pktbuf[pktbuf.len() - 2..]).unwrap_or(0); |
| 282 | let mut crc = 0; |
| 283 | for el in pktbuf.iter().take(pktbuf.len() - 2) { |
| 284 | crc = update_crc16(crc, *el); |
| 285 | } |
| 286 | if crc != ref_crc { |
| 287 | return Err(DecoderError::ChecksumError); |
| 288 | } |
| 289 | |
| 290 | let mut br = BitReader::new(&pktbuf, BitReaderMode::BE); |
| 291 | |
| 292 | let sync = br.read(14)?; |
| 293 | validate!(sync == 0x3FFE); |
| 294 | br.skip(1)?; |
| 295 | let _blocking = br.read(1)?; |
| 296 | let bsize_idx = br.read(4)?; |
| 297 | let srate_idx = br.read(4)?; |
| 298 | let chan_idx = br.read(4)?; |
| 299 | let bits_idx = br.read(3)?; |
| 300 | br.skip(1)?; |
| 301 | // UTF-8 encoded block or sample number |
| 302 | let byte = br.read(8)? as u8; |
| 303 | let len = (!byte).leading_zeros(); |
| 304 | validate!(len <= 5 && len != 1); |
| 305 | if len > 1 { |
| 306 | for _ in 1..len { |
| 307 | let byte = br.read(8)?; |
| 308 | validate!((byte & 0xC0) == 0x80); |
| 309 | } |
| 310 | } |
| 311 | let blocksize = match bsize_idx { |
| 312 | 0 => return Err(DecoderError::InvalidData), |
| 313 | 1 => 192, |
| 314 | 2..=5 => 576 << (bsize_idx - 2), |
| 315 | 6 => br.read(8)? as usize + 1, |
| 316 | 7 => br.read(16)? as usize + 1, |
| 317 | _ => 256 << (bsize_idx - 8), |
| 318 | }; |
| 319 | let srate = match srate_idx { |
| 320 | 0 => self.srate, |
| 321 | 1 => 88200, |
| 322 | 2 => 176400, |
| 323 | 3 => 192000, |
| 324 | 4 => 8000, |
| 325 | 5 => 16000, |
| 326 | 6 => 22050, |
| 327 | 7 => 24000, |
| 328 | 8 => 32000, |
| 329 | 9 => 44100, |
| 330 | 10 => 48000, |
| 331 | 11 => 96000, |
| 332 | 12 => br.read(8)? * 1000, |
| 333 | 13 => br.read(16)?, |
| 334 | 14 => br.read(16)? * 10, |
| 335 | _ => return Err(DecoderError::InvalidData), |
| 336 | }; |
| 337 | validate!(srate != 0 && srate == self.srate); |
| 338 | let (channels, chmod) = match chan_idx { |
| 339 | 0..=7 => (chan_idx as u8 + 1, StereoMode::Normal), |
| 340 | 8 => (2, StereoMode::LeftSide), |
| 341 | 9 => (2, StereoMode::SideRight), |
| 342 | 10 => (2, StereoMode::MidSide), |
| 343 | _ => return Err(DecoderError::InvalidData), |
| 344 | }; |
| 345 | validate!(channels == self.channels); |
| 346 | let bits = match bits_idx { |
| 347 | 0 => self.bits, |
| 348 | 1 => 8, |
| 349 | 2 => 12, |
| 350 | 4 => 16, |
| 351 | 5 => 20, |
| 352 | 6 => 24, |
| 353 | _ => return Err(DecoderError::InvalidData), |
| 354 | }; |
| 355 | validate!(bits == self.bits); |
| 356 | |
| 357 | let end = br.tell() / 8; |
| 358 | let ref_crc = br.read(8)? as u8; |
| 359 | let mut crc = 0; |
| 360 | for el in pktbuf.iter().take(end) { |
| 361 | crc = update_crc8(crc, *el); |
| 362 | } |
| 363 | if crc != ref_crc { |
| 364 | return Err(DecoderError::ChecksumError); |
| 365 | } |
| 366 | |
| 367 | for ch in 0..(channels as usize) { |
| 368 | let samp_bits = match (chmod, ch) { |
| 369 | (StereoMode::LeftSide, 1) | |
| 370 | (StereoMode::SideRight, 0) | |
| 371 | (StereoMode::MidSide, 1) => self.bits + 1, |
| 372 | _ => self.bits, |
| 373 | }; |
| 374 | validate!(samp_bits <= 32); |
| 375 | self.decode_subframe(&mut br, ch, blocksize, samp_bits)?; |
| 376 | } |
| 377 | if channels == 2 { |
| 378 | self.apply_chmod(blocksize, chmod); |
| 379 | } |
| 380 | |
| 381 | let mut abuf = alloc_audio_buffer(self.ainfo, blocksize, self.chmap.clone())?; |
| 382 | let postshift = if self.bits == 24 { 8 } else { 16 - self.bits }; |
| 383 | match abuf { |
| 384 | NABufferType::AudioI16(ref mut adata) => { |
| 385 | let stride = adata.get_stride(); |
| 386 | let dst = adata.get_data_mut().unwrap(); |
| 387 | let mut off = 0; |
| 388 | for residues in self.residues.iter().take(channels as usize) { |
| 389 | let dst = &mut dst[off..][..blocksize]; |
| 390 | for (dst, src) in dst.iter_mut().zip(residues.iter()) { |
| 391 | *dst = (*src << postshift) as i16; |
| 392 | } |
| 393 | off += stride; |
| 394 | } |
| 395 | }, |
| 396 | NABufferType::AudioI32(ref mut adata) => { |
| 397 | let stride = adata.get_stride(); |
| 398 | let dst = adata.get_data_mut().unwrap(); |
| 399 | let mut off = 0; |
| 400 | for residues in self.residues.iter().take(channels as usize) { |
| 401 | let dst = &mut dst[off..][..blocksize]; |
| 402 | for (dst, src) in dst.iter_mut().zip(residues.iter()) { |
| 403 | *dst = *src << postshift; |
| 404 | } |
| 405 | off += stride; |
| 406 | } |
| 407 | }, |
| 408 | _ => unreachable!(), |
| 409 | }; |
| 410 | |
| 411 | let mut frm = NAFrame::new_from_pkt(pkt, info, abuf); |
| 412 | frm.set_duration(Some(blocksize as u64)); |
| 413 | Ok(frm.into_ref()) |
| 414 | } else { |
| 415 | Err(DecoderError::InvalidData) |
| 416 | } |
| 417 | } |
| 418 | fn flush(&mut self) { |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | impl NAOptionHandler for FlacDecoder { |
| 423 | fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] } |
| 424 | fn set_options(&mut self, _options: &[NAOption]) { } |
| 425 | fn query_option_value(&self, _name: &str) -> Option<NAValue> { None } |
| 426 | } |
| 427 | |
| 428 | pub fn get_decoder() -> Box<dyn NADecoder + Send> { |
| 429 | Box::new(FlacDecoder::new()) |
| 430 | } |
| 431 | |
| 432 | #[derive(Clone,Copy,Default)] |
| 433 | struct FrameHeader { |
| 434 | blocksize: u32, |
| 435 | srate: u32, |
| 436 | channels: u8, |
| 437 | bits: u8, |
| 438 | time: u64, |
| 439 | blk_strat: bool, |
| 440 | } |
| 441 | |
| 442 | #[derive(Default)] |
| 443 | struct FLACPacketiser { |
| 444 | hdr: FrameHeader, |
| 445 | buf: Vec<u8>, |
| 446 | ref_crc: u16, |
| 447 | cur_crc: u16, |
| 448 | end: usize, |
| 449 | hdr_ok: bool, |
| 450 | } |
| 451 | |
| 452 | fn read_utf8(br: &mut BitReader) -> DecoderResult<u64> { |
| 453 | let byte = br.read(8)? as u8; |
| 454 | let len = (!byte).leading_zeros(); |
| 455 | if (len == 1) || (len > 5) { |
| 456 | return Err(DecoderError::InvalidData); |
| 457 | } |
| 458 | if len > 1 { |
| 459 | let mut val = u64::from(byte << len >> len); |
| 460 | for _ in 1..len { |
| 461 | let byte = br.read(8)?; |
| 462 | if (byte & 0xC0) != 0x80 { |
| 463 | return Err(DecoderError::InvalidData); |
| 464 | } |
| 465 | val = (val << 6) | u64::from(byte & 0x3F); |
| 466 | } |
| 467 | Ok(val) |
| 468 | } else { |
| 469 | Ok(u64::from(byte)) |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | impl FLACPacketiser { |
| 474 | fn new() -> Self { Self::default() } |
| 475 | fn parse_header(&self) -> DecoderResult<FrameHeader> { |
| 476 | if self.buf.len() < 5 { |
| 477 | return Err(DecoderError::ShortData); |
| 478 | } |
| 479 | let mut br = BitReader::new(&self.buf, BitReaderMode::BE); |
| 480 | let sync_code = br.read(14)?; |
| 481 | if sync_code != 0x3FFE { |
| 482 | return Err(DecoderError::InvalidData); |
| 483 | } |
| 484 | let marker = br.read(1)?; |
| 485 | if marker != 0 { |
| 486 | return Err(DecoderError::InvalidData); |
| 487 | } |
| 488 | let blk_strat = br.read_bool()?; |
| 489 | let bsize = br.read(4)?; |
| 490 | let srate_idx = br.read(4)? as u8; |
| 491 | let chan_idx = br.read(4)? as u8; |
| 492 | let bits = match br.read(3)? { |
| 493 | 0 => 0, |
| 494 | 1 => 8, |
| 495 | 2 => 12, |
| 496 | 4 => 16, |
| 497 | 5 => 20, |
| 498 | 6 => 24, |
| 499 | _ => return Err(DecoderError::InvalidData), |
| 500 | }; |
| 501 | let marker = br.read(1)?; |
| 502 | if marker != 0 { |
| 503 | return Err(DecoderError::InvalidData); |
| 504 | } |
| 505 | |
| 506 | let time = read_utf8(&mut br)?; |
| 507 | |
| 508 | let blocksize = match bsize { |
| 509 | 1 => 192, |
| 510 | 2..=5 => 576 << (bsize - 2), |
| 511 | 6 => br.read(8)? + 1, |
| 512 | 7 => br.read(16)? + 1, |
| 513 | 8..=15 => 256 << (bsize - 8), |
| 514 | _ => return Err(DecoderError::InvalidData), |
| 515 | }; |
| 516 | let srate = match srate_idx { |
| 517 | 0 => 0, |
| 518 | 1 => 88200, |
| 519 | 2 => 176400, |
| 520 | 3 => 192000, |
| 521 | 4 => 8000, |
| 522 | 5 => 16000, |
| 523 | 6 => 22050, |
| 524 | 7 => 24000, |
| 525 | 8 => 32000, |
| 526 | 9 => 44100, |
| 527 | 10 => 48000, |
| 528 | 11 => 96000, |
| 529 | 12 => br.read(8)? * 1000, |
| 530 | 13 => br.read(16)?, |
| 531 | 14 => br.read(16)? * 10, |
| 532 | _ => return Err(DecoderError::InvalidData), |
| 533 | }; |
| 534 | let channels = match chan_idx { |
| 535 | 0..=7 => chan_idx + 1, |
| 536 | 8 | 9 | 10 => 2, |
| 537 | _ => return Err(DecoderError::InvalidData), |
| 538 | }; |
| 539 | |
| 540 | let hdr_size = br.tell() / 8; |
| 541 | let ref_crc = br.read(8)? as u8; |
| 542 | let mut crc = 0; |
| 543 | for &b in self.buf[..hdr_size].iter() { |
| 544 | crc = update_crc8(crc, b); |
| 545 | } |
| 546 | if crc != ref_crc { |
| 547 | return Err(DecoderError::ChecksumError); |
| 548 | } |
| 549 | |
| 550 | Ok(FrameHeader{ blk_strat, time, srate, channels, bits, blocksize }) |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | impl NAPacketiser for FLACPacketiser { |
| 555 | fn add_data(&mut self, src: &[u8]) -> bool { |
| 556 | self.buf.extend_from_slice(src); |
| 557 | self.buf.len() < 4096 |
| 558 | } |
| 559 | fn parse_stream(&mut self, id: u32) -> DecoderResult<NAStreamRef> { |
| 560 | let hdr = self.parse_header()?; |
| 561 | let ainfo = NAAudioInfo::new(hdr.srate, hdr.channels, if hdr.bits <= 16 { SND_S16P_FORMAT } else { SND_S32P_FORMAT }, hdr.blocksize as usize); |
| 562 | let info = NACodecInfo::new("flac", NACodecTypeInfo::Audio(ainfo), None); |
| 563 | Ok(NAStream::new(StreamType::Audio, id, info, 1, hdr.srate, 0).into_ref()) |
| 564 | } |
| 565 | fn skip_junk(&mut self) -> DecoderResult<usize> { |
| 566 | Err(DecoderError::NotImplemented) |
| 567 | } |
| 568 | fn get_packet(&mut self, stream: NAStreamRef) -> DecoderResult<Option<NAPacket>> { |
| 569 | if self.end == self.buf.len() || self.buf.len() < 5 { |
| 570 | return Err(DecoderError::ShortData); |
| 571 | } |
| 572 | if !self.hdr_ok { |
| 573 | self.hdr = self.parse_header()?; |
| 574 | self.hdr_ok = true; |
| 575 | self.cur_crc = 0; |
| 576 | for i in 0..5 { |
| 577 | self.cur_crc = update_crc16(self.cur_crc, self.buf[i]); |
| 578 | } |
| 579 | self.end = 5; |
| 580 | } |
| 581 | while self.end < self.buf.len() { |
| 582 | let b = self.buf[self.end]; |
| 583 | self.end += 1; |
| 584 | match self.end { |
| 585 | 0..=5 => unreachable!(), |
| 586 | 6 => self.ref_crc = u16::from(b), |
| 587 | 7 => self.ref_crc = (self.ref_crc << 8) | u16::from(b), |
| 588 | _ => { |
| 589 | let bbb = (self.ref_crc >> 8) as u8; |
| 590 | self.ref_crc = (self.ref_crc << 8) | u16::from(b); |
| 591 | self.cur_crc = update_crc16(self.cur_crc, bbb); |
| 592 | let mut found = self.ref_crc == self.cur_crc; |
| 593 | if self.end + 2 < self.buf.len() { |
| 594 | let b1 = self.buf[self.end]; |
| 595 | let b2 = self.buf[self.end + 1]; |
| 596 | if b1 != 0xFF || (b2 & 0xFC) != 0xF8 { |
| 597 | found = false; |
| 598 | } |
| 599 | } |
| 600 | if found { |
| 601 | let mut data = Vec::with_capacity(self.end); |
| 602 | data.extend_from_slice(&self.buf[..self.end]); |
| 603 | self.buf.drain(..self.end); |
| 604 | let mut ts = NATimeInfo::new(None, None, Some(u64::from(self.hdr.blocksize)), 1, self.hdr.srate); |
| 605 | ts.pts = if self.hdr.blk_strat { |
| 606 | Some(self.hdr.time) |
| 607 | } else { |
| 608 | Some(self.hdr.time * u64::from(self.hdr.blocksize)) |
| 609 | }; |
| 610 | self.end = 0; |
| 611 | self.hdr_ok = false; |
| 612 | |
| 613 | return Ok(Some(NAPacket::new(stream, ts, true, data))); |
| 614 | } |
| 615 | }, |
| 616 | } |
| 617 | } |
| 618 | Ok(None) |
| 619 | } |
| 620 | fn reset(&mut self) { |
| 621 | self.buf.clear(); |
| 622 | self.end = 0; |
| 623 | self.hdr_ok = false; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | pub fn get_packetiser() -> Box<dyn NAPacketiser + Send> { |
| 628 | Box::new(FLACPacketiser::new()) |
| 629 | } |
| 630 | |
| 631 | #[cfg(test)] |
| 632 | mod test { |
| 633 | use nihav_core::codecs::*; |
| 634 | use nihav_core::demuxers::*; |
| 635 | use nihav_codec_support::test::dec_video::*; |
| 636 | use crate::llaudio_register_all_decoders; |
| 637 | use crate::llaudio_register_all_demuxers; |
| 638 | #[test] |
| 639 | fn test_flac() { |
| 640 | let mut dmx_reg = RegisteredDemuxers::new(); |
| 641 | llaudio_register_all_demuxers(&mut dmx_reg); |
| 642 | let mut dec_reg = RegisteredDecoders::new(); |
| 643 | llaudio_register_all_decoders(&mut dec_reg); |
| 644 | |
| 645 | test_decoding("flac", "flac", "assets/LLaudio/luckynight.flac", Some(6), &dmx_reg, &dec_reg, |
| 646 | ExpectedTestResult::MD5([0xe689787a, 0x032a98f7, 0xeb6e64f4, 0xfa652132])); |
| 647 | } |
| 648 | use std::io::{Read, Seek, SeekFrom}; |
| 649 | #[test] |
| 650 | fn test_flac_packetiser() { |
| 651 | let mut dmx_reg = RegisteredDemuxers::new(); |
| 652 | llaudio_register_all_demuxers(&mut dmx_reg); |
| 653 | let dmx_f = dmx_reg.find_demuxer("flac").unwrap(); |
| 654 | let mut file = std::fs::File::open("assets/LLaudio/luckynight.flac").unwrap(); |
| 655 | let mut fr = FileReader::new_read(&mut file); |
| 656 | let mut br = ByteReader::new(&mut fr); |
| 657 | let mut dmx = create_demuxer(dmx_f, &mut br).unwrap(); |
| 658 | |
| 659 | let mut pkt_sizes = Vec::new(); |
| 660 | while let Ok(pkt) = dmx.get_frame() { |
| 661 | pkt_sizes.push(pkt.get_buffer().len()); |
| 662 | } |
| 663 | |
| 664 | let mut file = std::fs::File::open("assets/LLaudio/luckynight.flac").unwrap(); |
| 665 | file.seek(SeekFrom::Start(0x115E)).unwrap(); |
| 666 | |
| 667 | let mut pkts = super::FLACPacketiser::new(); |
| 668 | let mut buf = [0; 8192]; |
| 669 | for _ in 0..16 { |
| 670 | file.read_exact(&mut buf).unwrap(); |
| 671 | pkts.add_data(&buf); |
| 672 | } |
| 673 | let stream = pkts.parse_stream(0).unwrap(); |
| 674 | let mut pkt_sizes2 = Vec::new(); |
| 675 | let mut piter = pkt_sizes.iter(); |
| 676 | loop { |
| 677 | let res = pkts.get_packet(stream.clone()); |
| 678 | match res { |
| 679 | Ok(Some(pkt)) => { |
| 680 | assert_eq!(*piter.next().unwrap(), pkt.get_buffer().len()); |
| 681 | pkt_sizes2.push(pkt.get_buffer().len()); |
| 682 | continue; |
| 683 | }, |
| 684 | Ok(None) | Err(DecoderError::ShortData) => {}, |
| 685 | Err(err) => { |
| 686 | println!("error {:?}", err); |
| 687 | panic!("packetising error"); |
| 688 | }, |
| 689 | }; |
| 690 | let ret = file.read(&mut buf); |
| 691 | match ret { |
| 692 | Ok(0) => { |
| 693 | let res = pkts.get_packet(stream.clone()); |
| 694 | match res { |
| 695 | Ok(Some(pkt)) => { |
| 696 | assert_eq!(*piter.next().unwrap(), pkt.get_buffer().len()); |
| 697 | pkt_sizes2.push(pkt.get_buffer().len()); |
| 698 | continue; |
| 699 | }, |
| 700 | Ok(None) | Err(DecoderError::ShortData) => break, |
| 701 | Err(err) => { |
| 702 | println!("error {:?}", err); |
| 703 | panic!("packetising error"); |
| 704 | }, |
| 705 | }; |
| 706 | }, |
| 707 | Ok(size) => pkts.add_data(&buf[..size]), |
| 708 | Err(err) => { |
| 709 | if err.kind() == std::io::ErrorKind::UnexpectedEof { |
| 710 | let res = pkts.get_packet(stream.clone()); |
| 711 | match res { |
| 712 | Ok(Some(pkt)) => { |
| 713 | assert_eq!(*piter.next().unwrap(), pkt.get_buffer().len()); |
| 714 | pkt_sizes2.push(pkt.get_buffer().len()); |
| 715 | continue; |
| 716 | }, |
| 717 | Ok(None) | Err(DecoderError::ShortData) => break, |
| 718 | Err(err) => { |
| 719 | println!("error {:?}", err); |
| 720 | panic!("packetising error"); |
| 721 | }, |
| 722 | }; |
| 723 | } else { |
| 724 | println!(" {:?}", err.kind()); |
| 725 | panic!("i/o error!"); |
| 726 | } |
| 727 | }, |
| 728 | }; |
| 729 | } |
| 730 | assert_eq!(pkt_sizes.len(), pkt_sizes2.len()); |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | fn update_crc8(crc: u8, byte: u8) -> u8 { |
| 735 | CRC8_TABLE[(crc ^ byte) as usize] |
| 736 | } |
| 737 | |
| 738 | fn update_crc16(crc: u16, byte: u8) -> u16 { |
| 739 | (crc << 8) ^ CRC16_TABLE[(((crc >> 8) as u8) ^ byte) as usize] |
| 740 | } |
| 741 | |
| 742 | const CRC8_TABLE: [u8; 256] = [ |
| 743 | 0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, |
| 744 | 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D, |
| 745 | 0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, |
| 746 | 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D, |
| 747 | 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, |
| 748 | 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD, |
| 749 | 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, |
| 750 | 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD, |
| 751 | 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, |
| 752 | 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA, |
| 753 | 0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, |
| 754 | 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A, |
| 755 | 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, |
| 756 | 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A, |
| 757 | 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, |
| 758 | 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, |
| 759 | 0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, |
| 760 | 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4, |
| 761 | 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, |
| 762 | 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4, |
| 763 | 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, |
| 764 | 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44, |
| 765 | 0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, |
| 766 | 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34, |
| 767 | 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, |
| 768 | 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63, |
| 769 | 0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, |
| 770 | 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13, |
| 771 | 0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, |
| 772 | 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83, |
| 773 | 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, |
| 774 | 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3 |
| 775 | ]; |
| 776 | |
| 777 | const CRC16_TABLE: [u16; 256] = [ |
| 778 | 0x0000, 0x8005, 0x800F, 0x000A, 0x801B, 0x001E, 0x0014, 0x8011, |
| 779 | 0x8033, 0x0036, 0x003C, 0x8039, 0x0028, 0x802D, 0x8027, 0x0022, |
| 780 | 0x8063, 0x0066, 0x006C, 0x8069, 0x0078, 0x807D, 0x8077, 0x0072, |
| 781 | 0x0050, 0x8055, 0x805F, 0x005A, 0x804B, 0x004E, 0x0044, 0x8041, |
| 782 | 0x80C3, 0x00C6, 0x00CC, 0x80C9, 0x00D8, 0x80DD, 0x80D7, 0x00D2, |
| 783 | 0x00F0, 0x80F5, 0x80FF, 0x00FA, 0x80EB, 0x00EE, 0x00E4, 0x80E1, |
| 784 | 0x00A0, 0x80A5, 0x80AF, 0x00AA, 0x80BB, 0x00BE, 0x00B4, 0x80B1, |
| 785 | 0x8093, 0x0096, 0x009C, 0x8099, 0x0088, 0x808D, 0x8087, 0x0082, |
| 786 | 0x8183, 0x0186, 0x018C, 0x8189, 0x0198, 0x819D, 0x8197, 0x0192, |
| 787 | 0x01B0, 0x81B5, 0x81BF, 0x01BA, 0x81AB, 0x01AE, 0x01A4, 0x81A1, |
| 788 | 0x01E0, 0x81E5, 0x81EF, 0x01EA, 0x81FB, 0x01FE, 0x01F4, 0x81F1, |
| 789 | 0x81D3, 0x01D6, 0x01DC, 0x81D9, 0x01C8, 0x81CD, 0x81C7, 0x01C2, |
| 790 | 0x0140, 0x8145, 0x814F, 0x014A, 0x815B, 0x015E, 0x0154, 0x8151, |
| 791 | 0x8173, 0x0176, 0x017C, 0x8179, 0x0168, 0x816D, 0x8167, 0x0162, |
| 792 | 0x8123, 0x0126, 0x012C, 0x8129, 0x0138, 0x813D, 0x8137, 0x0132, |
| 793 | 0x0110, 0x8115, 0x811F, 0x011A, 0x810B, 0x010E, 0x0104, 0x8101, |
| 794 | 0x8303, 0x0306, 0x030C, 0x8309, 0x0318, 0x831D, 0x8317, 0x0312, |
| 795 | 0x0330, 0x8335, 0x833F, 0x033A, 0x832B, 0x032E, 0x0324, 0x8321, |
| 796 | 0x0360, 0x8365, 0x836F, 0x036A, 0x837B, 0x037E, 0x0374, 0x8371, |
| 797 | 0x8353, 0x0356, 0x035C, 0x8359, 0x0348, 0x834D, 0x8347, 0x0342, |
| 798 | 0x03C0, 0x83C5, 0x83CF, 0x03CA, 0x83DB, 0x03DE, 0x03D4, 0x83D1, |
| 799 | 0x83F3, 0x03F6, 0x03FC, 0x83F9, 0x03E8, 0x83ED, 0x83E7, 0x03E2, |
| 800 | 0x83A3, 0x03A6, 0x03AC, 0x83A9, 0x03B8, 0x83BD, 0x83B7, 0x03B2, |
| 801 | 0x0390, 0x8395, 0x839F, 0x039A, 0x838B, 0x038E, 0x0384, 0x8381, |
| 802 | 0x0280, 0x8285, 0x828F, 0x028A, 0x829B, 0x029E, 0x0294, 0x8291, |
| 803 | 0x82B3, 0x02B6, 0x02BC, 0x82B9, 0x02A8, 0x82AD, 0x82A7, 0x02A2, |
| 804 | 0x82E3, 0x02E6, 0x02EC, 0x82E9, 0x02F8, 0x82FD, 0x82F7, 0x02F2, |
| 805 | 0x02D0, 0x82D5, 0x82DF, 0x02DA, 0x82CB, 0x02CE, 0x02C4, 0x82C1, |
| 806 | 0x8243, 0x0246, 0x024C, 0x8249, 0x0258, 0x825D, 0x8257, 0x0252, |
| 807 | 0x0270, 0x8275, 0x827F, 0x027A, 0x826B, 0x026E, 0x0264, 0x8261, |
| 808 | 0x0220, 0x8225, 0x822F, 0x022A, 0x823B, 0x023E, 0x0234, 0x8231, |
| 809 | 0x8213, 0x0216, 0x021C, 0x8219, 0x0208, 0x820D, 0x8207, 0x0202 |
| 810 | ]; |