Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1 | /* Copyright (c) 2007-2008 CSIRO |
| 2 | Copyright (c) 2007-2009 Xiph.Org Foundation |
| 3 | Copyright (c) 2008-2009 Gregory Maxwell |
| 4 | Written by Jean-Marc Valin and Gregory Maxwell */ |
| 5 | /* |
| 6 | Redistribution and use in source and binary forms, with or without |
| 7 | modification, are permitted provided that the following conditions |
| 8 | are met: |
| 9 | |
| 10 | - Redistributions of source code must retain the above copyright |
| 11 | notice, this list of conditions and the following disclaimer. |
| 12 | |
| 13 | - Redistributions in binary form must reproduce the above copyright |
| 14 | notice, this list of conditions and the following disclaimer in the |
| 15 | documentation and/or other materials provided with the distribution. |
| 16 | |
| 17 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 18 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 19 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 20 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER |
| 21 | OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 22 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 23 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 24 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 25 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 26 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 27 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | #include "config.h" |
| 32 | #endif |
| 33 | |
| 34 | #include <math.h> |
| 35 | #include "bands.h" |
| 36 | #include "modes.h" |
| 37 | #include "vq.h" |
| 38 | #include "cwrs.h" |
| 39 | #include "stack_alloc.h" |
| 40 | #include "os_support.h" |
| 41 | #include "mathops.h" |
| 42 | #include "rate.h" |
| 43 | #include "quant_bands.h" |
| 44 | #include "pitch.h" |
| 45 | |
| 46 | int hysteresis_decision(opus_val16 val, const opus_val16 *thresholds, const opus_val16 *hysteresis, int N, int prev) |
| 47 | { |
| 48 | int i; |
| 49 | for (i=0;i<N;i++) |
| 50 | { |
| 51 | if (val < thresholds[i]) |
| 52 | break; |
| 53 | } |
| 54 | if (i>prev && val < thresholds[prev]+hysteresis[prev]) |
| 55 | i=prev; |
| 56 | if (i<prev && val > thresholds[prev-1]-hysteresis[prev-1]) |
| 57 | i=prev; |
| 58 | return i; |
| 59 | } |
| 60 | |
| 61 | opus_uint32 celt_lcg_rand(opus_uint32 seed) |
| 62 | { |
| 63 | return 1664525 * seed + 1013904223; |
| 64 | } |
| 65 | |
| 66 | /* This is a cos() approximation designed to be bit-exact on any platform. Bit exactness |
| 67 | with this approximation is important because it has an impact on the bit allocation */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 68 | opus_int16 bitexact_cos(opus_int16 x) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 69 | { |
| 70 | opus_int32 tmp; |
| 71 | opus_int16 x2; |
| 72 | tmp = (4096+((opus_int32)(x)*(x)))>>13; |
| 73 | celt_assert(tmp<=32767); |
| 74 | x2 = tmp; |
| 75 | x2 = (32767-x2) + FRAC_MUL16(x2, (-7651 + FRAC_MUL16(x2, (8277 + FRAC_MUL16(-626, x2))))); |
| 76 | celt_assert(x2<=32766); |
| 77 | return 1+x2; |
| 78 | } |
| 79 | |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 80 | int bitexact_log2tan(int isin,int icos) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 81 | { |
| 82 | int lc; |
| 83 | int ls; |
| 84 | lc=EC_ILOG(icos); |
| 85 | ls=EC_ILOG(isin); |
| 86 | icos<<=15-lc; |
| 87 | isin<<=15-ls; |
| 88 | return (ls-lc)*(1<<11) |
| 89 | +FRAC_MUL16(isin, FRAC_MUL16(isin, -2597) + 7932) |
| 90 | -FRAC_MUL16(icos, FRAC_MUL16(icos, -2597) + 7932); |
| 91 | } |
| 92 | |
| 93 | #ifdef FIXED_POINT |
| 94 | /* Compute the amplitude (sqrt energy) in each of the bands */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 95 | void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bandE, int end, int C, int LM, int arch) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 96 | { |
| 97 | int i, c, N; |
| 98 | const opus_int16 *eBands = m->eBands; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 99 | (void)arch; |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 100 | N = m->shortMdctSize<<LM; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 101 | c=0; do { |
| 102 | for (i=0;i<end;i++) |
| 103 | { |
| 104 | int j; |
| 105 | opus_val32 maxval=0; |
| 106 | opus_val32 sum = 0; |
| 107 | |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 108 | maxval = celt_maxabs32(&X[c*N+(eBands[i]<<LM)], (eBands[i+1]-eBands[i])<<LM); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 109 | if (maxval > 0) |
| 110 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 111 | int shift = celt_ilog2(maxval) - 14 + (((m->logN[i]>>BITRES)+LM+1)>>1); |
| 112 | j=eBands[i]<<LM; |
| 113 | if (shift>0) |
| 114 | { |
| 115 | do { |
| 116 | sum = MAC16_16(sum, EXTRACT16(SHR32(X[j+c*N],shift)), |
| 117 | EXTRACT16(SHR32(X[j+c*N],shift))); |
| 118 | } while (++j<eBands[i+1]<<LM); |
| 119 | } else { |
| 120 | do { |
| 121 | sum = MAC16_16(sum, EXTRACT16(SHL32(X[j+c*N],-shift)), |
| 122 | EXTRACT16(SHL32(X[j+c*N],-shift))); |
| 123 | } while (++j<eBands[i+1]<<LM); |
| 124 | } |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 125 | /* We're adding one here to ensure the normalized band isn't larger than unity norm */ |
| 126 | bandE[i+c*m->nbEBands] = EPSILON+VSHR32(EXTEND32(celt_sqrt(sum)),-shift); |
| 127 | } else { |
| 128 | bandE[i+c*m->nbEBands] = EPSILON; |
| 129 | } |
| 130 | /*printf ("%f ", bandE[i+c*m->nbEBands]);*/ |
| 131 | } |
| 132 | } while (++c<C); |
| 133 | /*printf ("\n");*/ |
| 134 | } |
| 135 | |
| 136 | /* Normalise each band such that the energy is one. */ |
| 137 | void normalise_bands(const CELTMode *m, const celt_sig * OPUS_RESTRICT freq, celt_norm * OPUS_RESTRICT X, const celt_ener *bandE, int end, int C, int M) |
| 138 | { |
| 139 | int i, c, N; |
| 140 | const opus_int16 *eBands = m->eBands; |
| 141 | N = M*m->shortMdctSize; |
| 142 | c=0; do { |
| 143 | i=0; do { |
| 144 | opus_val16 g; |
| 145 | int j,shift; |
| 146 | opus_val16 E; |
| 147 | shift = celt_zlog2(bandE[i+c*m->nbEBands])-13; |
| 148 | E = VSHR32(bandE[i+c*m->nbEBands], shift); |
| 149 | g = EXTRACT16(celt_rcp(SHL32(E,3))); |
| 150 | j=M*eBands[i]; do { |
| 151 | X[j+c*N] = MULT16_16_Q15(VSHR32(freq[j+c*N],shift-1),g); |
| 152 | } while (++j<M*eBands[i+1]); |
| 153 | } while (++i<end); |
| 154 | } while (++c<C); |
| 155 | } |
| 156 | |
| 157 | #else /* FIXED_POINT */ |
| 158 | /* Compute the amplitude (sqrt energy) in each of the bands */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 159 | void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bandE, int end, int C, int LM, int arch) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 160 | { |
| 161 | int i, c, N; |
| 162 | const opus_int16 *eBands = m->eBands; |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 163 | N = m->shortMdctSize<<LM; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 164 | c=0; do { |
| 165 | for (i=0;i<end;i++) |
| 166 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 167 | opus_val32 sum; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 168 | sum = 1e-27f + celt_inner_prod(&X[c*N+(eBands[i]<<LM)], &X[c*N+(eBands[i]<<LM)], (eBands[i+1]-eBands[i])<<LM, arch); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 169 | bandE[i+c*m->nbEBands] = celt_sqrt(sum); |
| 170 | /*printf ("%f ", bandE[i+c*m->nbEBands]);*/ |
| 171 | } |
| 172 | } while (++c<C); |
| 173 | /*printf ("\n");*/ |
| 174 | } |
| 175 | |
| 176 | /* Normalise each band such that the energy is one. */ |
| 177 | void normalise_bands(const CELTMode *m, const celt_sig * OPUS_RESTRICT freq, celt_norm * OPUS_RESTRICT X, const celt_ener *bandE, int end, int C, int M) |
| 178 | { |
| 179 | int i, c, N; |
| 180 | const opus_int16 *eBands = m->eBands; |
| 181 | N = M*m->shortMdctSize; |
| 182 | c=0; do { |
| 183 | for (i=0;i<end;i++) |
| 184 | { |
| 185 | int j; |
| 186 | opus_val16 g = 1.f/(1e-27f+bandE[i+c*m->nbEBands]); |
| 187 | for (j=M*eBands[i];j<M*eBands[i+1];j++) |
| 188 | X[j+c*N] = freq[j+c*N]*g; |
| 189 | } |
| 190 | } while (++c<C); |
| 191 | } |
| 192 | |
| 193 | #endif /* FIXED_POINT */ |
| 194 | |
| 195 | /* De-normalise the energy to produce the synthesis from the unit-energy bands */ |
| 196 | void denormalise_bands(const CELTMode *m, const celt_norm * OPUS_RESTRICT X, |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 197 | celt_sig * OPUS_RESTRICT freq, const opus_val16 *bandLogE, int start, |
| 198 | int end, int M, int downsample, int silence) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 199 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 200 | int i, N; |
| 201 | int bound; |
| 202 | celt_sig * OPUS_RESTRICT f; |
| 203 | const celt_norm * OPUS_RESTRICT x; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 204 | const opus_int16 *eBands = m->eBands; |
| 205 | N = M*m->shortMdctSize; |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 206 | bound = M*eBands[end]; |
| 207 | if (downsample!=1) |
| 208 | bound = IMIN(bound, N/downsample); |
| 209 | if (silence) |
| 210 | { |
| 211 | bound = 0; |
| 212 | start = end = 0; |
| 213 | } |
| 214 | f = freq; |
| 215 | x = X+M*eBands[start]; |
| 216 | for (i=0;i<M*eBands[start];i++) |
| 217 | *f++ = 0; |
| 218 | for (i=start;i<end;i++) |
| 219 | { |
| 220 | int j, band_end; |
| 221 | opus_val16 g; |
| 222 | opus_val16 lg; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 223 | #ifdef FIXED_POINT |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 224 | int shift; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 225 | #endif |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 226 | j=M*eBands[i]; |
| 227 | band_end = M*eBands[i+1]; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 228 | lg = SATURATE16(ADD32(bandLogE[i], SHL32((opus_val32)eMeans[i],6))); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 229 | #ifndef FIXED_POINT |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 230 | g = celt_exp2(MIN32(32.f, lg)); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 231 | #else |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 232 | /* Handle the integer part of the log energy */ |
| 233 | shift = 16-(lg>>DB_SHIFT); |
| 234 | if (shift>31) |
| 235 | { |
| 236 | shift=0; |
| 237 | g=0; |
| 238 | } else { |
| 239 | /* Handle the fractional part. */ |
| 240 | g = celt_exp2_frac(lg&((1<<DB_SHIFT)-1)); |
| 241 | } |
| 242 | /* Handle extreme gains with negative shift. */ |
| 243 | if (shift<0) |
| 244 | { |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 245 | /* For shift <= -2 and g > 16384 we'd be likely to overflow, so we're |
| 246 | capping the gain here, which is equivalent to a cap of 18 on lg. |
| 247 | This shouldn't trigger unless the bitstream is already corrupted. */ |
| 248 | if (shift <= -2) |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 249 | { |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 250 | g = 16384; |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 251 | shift = -2; |
| 252 | } |
| 253 | do { |
| 254 | *f++ = SHL32(MULT16_16(*x++, g), -shift); |
| 255 | } while (++j<band_end); |
| 256 | } else |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 257 | #endif |
| 258 | /* Be careful of the fixed-point "else" just above when changing this code */ |
| 259 | do { |
| 260 | *f++ = SHR32(MULT16_16(*x++, g), shift); |
| 261 | } while (++j<band_end); |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 262 | } |
| 263 | celt_assert(start <= end); |
| 264 | OPUS_CLEAR(&freq[bound], N-bound); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 265 | } |
| 266 | |
| 267 | /* This prevents energy collapse for transients with multiple short MDCTs */ |
| 268 | void anti_collapse(const CELTMode *m, celt_norm *X_, unsigned char *collapse_masks, int LM, int C, int size, |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 269 | int start, int end, const opus_val16 *logE, const opus_val16 *prev1logE, |
| 270 | const opus_val16 *prev2logE, const int *pulses, opus_uint32 seed, int arch) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 271 | { |
| 272 | int c, i, j, k; |
| 273 | for (i=start;i<end;i++) |
| 274 | { |
| 275 | int N0; |
| 276 | opus_val16 thresh, sqrt_1; |
| 277 | int depth; |
| 278 | #ifdef FIXED_POINT |
| 279 | int shift; |
| 280 | opus_val32 thresh32; |
| 281 | #endif |
| 282 | |
| 283 | N0 = m->eBands[i+1]-m->eBands[i]; |
| 284 | /* depth in 1/8 bits */ |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 285 | celt_assert(pulses[i]>=0); |
| 286 | depth = celt_udiv(1+pulses[i], (m->eBands[i+1]-m->eBands[i]))>>LM; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 287 | |
| 288 | #ifdef FIXED_POINT |
| 289 | thresh32 = SHR32(celt_exp2(-SHL16(depth, 10-BITRES)),1); |
| 290 | thresh = MULT16_32_Q15(QCONST16(0.5f, 15), MIN32(32767,thresh32)); |
| 291 | { |
| 292 | opus_val32 t; |
| 293 | t = N0<<LM; |
| 294 | shift = celt_ilog2(t)>>1; |
| 295 | t = SHL32(t, (7-shift)<<1); |
| 296 | sqrt_1 = celt_rsqrt_norm(t); |
| 297 | } |
| 298 | #else |
| 299 | thresh = .5f*celt_exp2(-.125f*depth); |
| 300 | sqrt_1 = celt_rsqrt(N0<<LM); |
| 301 | #endif |
| 302 | |
| 303 | c=0; do |
| 304 | { |
| 305 | celt_norm *X; |
| 306 | opus_val16 prev1; |
| 307 | opus_val16 prev2; |
| 308 | opus_val32 Ediff; |
| 309 | opus_val16 r; |
| 310 | int renormalize=0; |
| 311 | prev1 = prev1logE[c*m->nbEBands+i]; |
| 312 | prev2 = prev2logE[c*m->nbEBands+i]; |
| 313 | if (C==1) |
| 314 | { |
| 315 | prev1 = MAX16(prev1,prev1logE[m->nbEBands+i]); |
| 316 | prev2 = MAX16(prev2,prev2logE[m->nbEBands+i]); |
| 317 | } |
| 318 | Ediff = EXTEND32(logE[c*m->nbEBands+i])-EXTEND32(MIN16(prev1,prev2)); |
| 319 | Ediff = MAX32(0, Ediff); |
| 320 | |
| 321 | #ifdef FIXED_POINT |
| 322 | if (Ediff < 16384) |
| 323 | { |
| 324 | opus_val32 r32 = SHR32(celt_exp2(-EXTRACT16(Ediff)),1); |
| 325 | r = 2*MIN16(16383,r32); |
| 326 | } else { |
| 327 | r = 0; |
| 328 | } |
| 329 | if (LM==3) |
| 330 | r = MULT16_16_Q14(23170, MIN32(23169, r)); |
| 331 | r = SHR16(MIN16(thresh, r),1); |
| 332 | r = SHR32(MULT16_16_Q15(sqrt_1, r),shift); |
| 333 | #else |
| 334 | /* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because |
| 335 | short blocks don't have the same energy as long */ |
| 336 | r = 2.f*celt_exp2(-Ediff); |
| 337 | if (LM==3) |
| 338 | r *= 1.41421356f; |
| 339 | r = MIN16(thresh, r); |
| 340 | r = r*sqrt_1; |
| 341 | #endif |
| 342 | X = X_+c*size+(m->eBands[i]<<LM); |
| 343 | for (k=0;k<1<<LM;k++) |
| 344 | { |
| 345 | /* Detect collapse */ |
| 346 | if (!(collapse_masks[i*C+c]&1<<k)) |
| 347 | { |
| 348 | /* Fill with noise */ |
| 349 | for (j=0;j<N0;j++) |
| 350 | { |
| 351 | seed = celt_lcg_rand(seed); |
| 352 | X[(j<<LM)+k] = (seed&0x8000 ? r : -r); |
| 353 | } |
| 354 | renormalize = 1; |
| 355 | } |
| 356 | } |
| 357 | /* We just added some energy, so we need to renormalise */ |
| 358 | if (renormalize) |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 359 | renormalise_vector(X, N0<<LM, Q15ONE, arch); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 360 | } while (++c<C); |
| 361 | } |
| 362 | } |
| 363 | |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 364 | /* Compute the weights to use for optimizing normalized distortion across |
| 365 | channels. We use the amplitude to weight square distortion, which means |
| 366 | that we use the square root of the value we would have been using if we |
| 367 | wanted to minimize the MSE in the non-normalized domain. This roughly |
| 368 | corresponds to some quick-and-dirty perceptual experiments I ran to |
| 369 | measure inter-aural masking (there doesn't seem to be any published data |
| 370 | on the topic). */ |
| 371 | static void compute_channel_weights(celt_ener Ex, celt_ener Ey, opus_val16 w[2]) |
| 372 | { |
| 373 | celt_ener minE; |
| 374 | #if FIXED_POINT |
| 375 | int shift; |
| 376 | #endif |
| 377 | minE = MIN32(Ex, Ey); |
| 378 | /* Adjustment to make the weights a bit more conservative. */ |
| 379 | Ex = ADD32(Ex, minE/3); |
| 380 | Ey = ADD32(Ey, minE/3); |
| 381 | #if FIXED_POINT |
| 382 | shift = celt_ilog2(EPSILON+MAX32(Ex, Ey))-14; |
| 383 | #endif |
| 384 | w[0] = VSHR32(Ex, shift); |
| 385 | w[1] = VSHR32(Ey, shift); |
| 386 | } |
| 387 | |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 388 | static void intensity_stereo(const CELTMode *m, celt_norm * OPUS_RESTRICT X, const celt_norm * OPUS_RESTRICT Y, const celt_ener *bandE, int bandID, int N) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 389 | { |
| 390 | int i = bandID; |
| 391 | int j; |
| 392 | opus_val16 a1, a2; |
| 393 | opus_val16 left, right; |
| 394 | opus_val16 norm; |
| 395 | #ifdef FIXED_POINT |
| 396 | int shift = celt_zlog2(MAX32(bandE[i], bandE[i+m->nbEBands]))-13; |
| 397 | #endif |
| 398 | left = VSHR32(bandE[i],shift); |
| 399 | right = VSHR32(bandE[i+m->nbEBands],shift); |
| 400 | norm = EPSILON + celt_sqrt(EPSILON+MULT16_16(left,left)+MULT16_16(right,right)); |
| 401 | a1 = DIV32_16(SHL32(EXTEND32(left),14),norm); |
| 402 | a2 = DIV32_16(SHL32(EXTEND32(right),14),norm); |
| 403 | for (j=0;j<N;j++) |
| 404 | { |
| 405 | celt_norm r, l; |
| 406 | l = X[j]; |
| 407 | r = Y[j]; |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 408 | X[j] = EXTRACT16(SHR32(MAC16_16(MULT16_16(a1, l), a2, r), 14)); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 409 | /* Side is not encoded, no need to calculate */ |
| 410 | } |
| 411 | } |
| 412 | |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 413 | static void stereo_split(celt_norm * OPUS_RESTRICT X, celt_norm * OPUS_RESTRICT Y, int N) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 414 | { |
| 415 | int j; |
| 416 | for (j=0;j<N;j++) |
| 417 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 418 | opus_val32 r, l; |
| 419 | l = MULT16_16(QCONST16(.70710678f, 15), X[j]); |
| 420 | r = MULT16_16(QCONST16(.70710678f, 15), Y[j]); |
| 421 | X[j] = EXTRACT16(SHR32(ADD32(l, r), 15)); |
| 422 | Y[j] = EXTRACT16(SHR32(SUB32(r, l), 15)); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 423 | } |
| 424 | } |
| 425 | |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 426 | static void stereo_merge(celt_norm * OPUS_RESTRICT X, celt_norm * OPUS_RESTRICT Y, opus_val16 mid, int N, int arch) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 427 | { |
| 428 | int j; |
| 429 | opus_val32 xp=0, side=0; |
| 430 | opus_val32 El, Er; |
| 431 | opus_val16 mid2; |
| 432 | #ifdef FIXED_POINT |
| 433 | int kl, kr; |
| 434 | #endif |
| 435 | opus_val32 t, lgain, rgain; |
| 436 | |
| 437 | /* Compute the norm of X+Y and X-Y as |X|^2 + |Y|^2 +/- sum(xy) */ |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 438 | dual_inner_prod(Y, X, Y, N, &xp, &side, arch); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 439 | /* Compensating for the mid normalization */ |
| 440 | xp = MULT16_32_Q15(mid, xp); |
| 441 | /* mid and side are in Q15, not Q14 like X and Y */ |
Felicia Lim | d03c373 | 2016-07-25 20:28:37 +0200 | [diff] [blame] | 442 | mid2 = SHR16(mid, 1); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 443 | El = MULT16_16(mid2, mid2) + side - 2*xp; |
| 444 | Er = MULT16_16(mid2, mid2) + side + 2*xp; |
| 445 | if (Er < QCONST32(6e-4f, 28) || El < QCONST32(6e-4f, 28)) |
| 446 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 447 | OPUS_COPY(Y, X, N); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 448 | return; |
| 449 | } |
| 450 | |
| 451 | #ifdef FIXED_POINT |
| 452 | kl = celt_ilog2(El)>>1; |
| 453 | kr = celt_ilog2(Er)>>1; |
| 454 | #endif |
| 455 | t = VSHR32(El, (kl-7)<<1); |
| 456 | lgain = celt_rsqrt_norm(t); |
| 457 | t = VSHR32(Er, (kr-7)<<1); |
| 458 | rgain = celt_rsqrt_norm(t); |
| 459 | |
| 460 | #ifdef FIXED_POINT |
| 461 | if (kl < 7) |
| 462 | kl = 7; |
| 463 | if (kr < 7) |
| 464 | kr = 7; |
| 465 | #endif |
| 466 | |
| 467 | for (j=0;j<N;j++) |
| 468 | { |
| 469 | celt_norm r, l; |
| 470 | /* Apply mid scaling (side is already scaled) */ |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 471 | l = MULT16_16_P15(mid, X[j]); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 472 | r = Y[j]; |
| 473 | X[j] = EXTRACT16(PSHR32(MULT16_16(lgain, SUB16(l,r)), kl+1)); |
| 474 | Y[j] = EXTRACT16(PSHR32(MULT16_16(rgain, ADD16(l,r)), kr+1)); |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | /* Decide whether we should spread the pulses in the current frame */ |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 479 | int spreading_decision(const CELTMode *m, const celt_norm *X, int *average, |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 480 | int last_decision, int *hf_average, int *tapset_decision, int update_hf, |
| 481 | int end, int C, int M) |
| 482 | { |
| 483 | int i, c, N0; |
| 484 | int sum = 0, nbBands=0; |
| 485 | const opus_int16 * OPUS_RESTRICT eBands = m->eBands; |
| 486 | int decision; |
| 487 | int hf_sum=0; |
| 488 | |
| 489 | celt_assert(end>0); |
| 490 | |
| 491 | N0 = M*m->shortMdctSize; |
| 492 | |
| 493 | if (M*(eBands[end]-eBands[end-1]) <= 8) |
| 494 | return SPREAD_NONE; |
| 495 | c=0; do { |
| 496 | for (i=0;i<end;i++) |
| 497 | { |
| 498 | int j, N, tmp=0; |
| 499 | int tcount[3] = {0,0,0}; |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 500 | const celt_norm * OPUS_RESTRICT x = X+M*eBands[i]+c*N0; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 501 | N = M*(eBands[i+1]-eBands[i]); |
| 502 | if (N<=8) |
| 503 | continue; |
| 504 | /* Compute rough CDF of |x[j]| */ |
| 505 | for (j=0;j<N;j++) |
| 506 | { |
| 507 | opus_val32 x2N; /* Q13 */ |
| 508 | |
| 509 | x2N = MULT16_16(MULT16_16_Q15(x[j], x[j]), N); |
| 510 | if (x2N < QCONST16(0.25f,13)) |
| 511 | tcount[0]++; |
| 512 | if (x2N < QCONST16(0.0625f,13)) |
| 513 | tcount[1]++; |
| 514 | if (x2N < QCONST16(0.015625f,13)) |
| 515 | tcount[2]++; |
| 516 | } |
| 517 | |
| 518 | /* Only include four last bands (8 kHz and up) */ |
| 519 | if (i>m->nbEBands-4) |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 520 | hf_sum += celt_udiv(32*(tcount[1]+tcount[0]), N); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 521 | tmp = (2*tcount[2] >= N) + (2*tcount[1] >= N) + (2*tcount[0] >= N); |
| 522 | sum += tmp*256; |
| 523 | nbBands++; |
| 524 | } |
| 525 | } while (++c<C); |
| 526 | |
| 527 | if (update_hf) |
| 528 | { |
| 529 | if (hf_sum) |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 530 | hf_sum = celt_udiv(hf_sum, C*(4-m->nbEBands+end)); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 531 | *hf_average = (*hf_average+hf_sum)>>1; |
| 532 | hf_sum = *hf_average; |
| 533 | if (*tapset_decision==2) |
| 534 | hf_sum += 4; |
| 535 | else if (*tapset_decision==0) |
| 536 | hf_sum -= 4; |
| 537 | if (hf_sum > 22) |
| 538 | *tapset_decision=2; |
| 539 | else if (hf_sum > 18) |
| 540 | *tapset_decision=1; |
| 541 | else |
| 542 | *tapset_decision=0; |
| 543 | } |
| 544 | /*printf("%d %d %d\n", hf_sum, *hf_average, *tapset_decision);*/ |
| 545 | celt_assert(nbBands>0); /* end has to be non-zero */ |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 546 | celt_assert(sum>=0); |
| 547 | sum = celt_udiv(sum, nbBands); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 548 | /* Recursive averaging */ |
| 549 | sum = (sum+*average)>>1; |
| 550 | *average = sum; |
| 551 | /* Hysteresis */ |
| 552 | sum = (3*sum + (((3-last_decision)<<7) + 64) + 2)>>2; |
| 553 | if (sum < 80) |
| 554 | { |
| 555 | decision = SPREAD_AGGRESSIVE; |
| 556 | } else if (sum < 256) |
| 557 | { |
| 558 | decision = SPREAD_NORMAL; |
| 559 | } else if (sum < 384) |
| 560 | { |
| 561 | decision = SPREAD_LIGHT; |
| 562 | } else { |
| 563 | decision = SPREAD_NONE; |
| 564 | } |
| 565 | #ifdef FUZZING |
| 566 | decision = rand()&0x3; |
| 567 | *tapset_decision=rand()%3; |
| 568 | #endif |
| 569 | return decision; |
| 570 | } |
| 571 | |
| 572 | /* Indexing table for converting from natural Hadamard to ordery Hadamard |
| 573 | This is essentially a bit-reversed Gray, on top of which we've added |
| 574 | an inversion of the order because we want the DC at the end rather than |
| 575 | the beginning. The lines are for N=2, 4, 8, 16 */ |
| 576 | static const int ordery_table[] = { |
| 577 | 1, 0, |
| 578 | 3, 0, 2, 1, |
| 579 | 7, 0, 4, 3, 6, 1, 5, 2, |
| 580 | 15, 0, 8, 7, 12, 3, 11, 4, 14, 1, 9, 6, 13, 2, 10, 5, |
| 581 | }; |
| 582 | |
| 583 | static void deinterleave_hadamard(celt_norm *X, int N0, int stride, int hadamard) |
| 584 | { |
| 585 | int i,j; |
| 586 | VARDECL(celt_norm, tmp); |
| 587 | int N; |
| 588 | SAVE_STACK; |
| 589 | N = N0*stride; |
| 590 | ALLOC(tmp, N, celt_norm); |
| 591 | celt_assert(stride>0); |
| 592 | if (hadamard) |
| 593 | { |
| 594 | const int *ordery = ordery_table+stride-2; |
| 595 | for (i=0;i<stride;i++) |
| 596 | { |
| 597 | for (j=0;j<N0;j++) |
| 598 | tmp[ordery[i]*N0+j] = X[j*stride+i]; |
| 599 | } |
| 600 | } else { |
| 601 | for (i=0;i<stride;i++) |
| 602 | for (j=0;j<N0;j++) |
| 603 | tmp[i*N0+j] = X[j*stride+i]; |
| 604 | } |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 605 | OPUS_COPY(X, tmp, N); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 606 | RESTORE_STACK; |
| 607 | } |
| 608 | |
| 609 | static void interleave_hadamard(celt_norm *X, int N0, int stride, int hadamard) |
| 610 | { |
| 611 | int i,j; |
| 612 | VARDECL(celt_norm, tmp); |
| 613 | int N; |
| 614 | SAVE_STACK; |
| 615 | N = N0*stride; |
| 616 | ALLOC(tmp, N, celt_norm); |
| 617 | if (hadamard) |
| 618 | { |
| 619 | const int *ordery = ordery_table+stride-2; |
| 620 | for (i=0;i<stride;i++) |
| 621 | for (j=0;j<N0;j++) |
| 622 | tmp[j*stride+i] = X[ordery[i]*N0+j]; |
| 623 | } else { |
| 624 | for (i=0;i<stride;i++) |
| 625 | for (j=0;j<N0;j++) |
| 626 | tmp[j*stride+i] = X[i*N0+j]; |
| 627 | } |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 628 | OPUS_COPY(X, tmp, N); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 629 | RESTORE_STACK; |
| 630 | } |
| 631 | |
| 632 | void haar1(celt_norm *X, int N0, int stride) |
| 633 | { |
| 634 | int i, j; |
| 635 | N0 >>= 1; |
| 636 | for (i=0;i<stride;i++) |
| 637 | for (j=0;j<N0;j++) |
| 638 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 639 | opus_val32 tmp1, tmp2; |
| 640 | tmp1 = MULT16_16(QCONST16(.70710678f,15), X[stride*2*j+i]); |
| 641 | tmp2 = MULT16_16(QCONST16(.70710678f,15), X[stride*(2*j+1)+i]); |
| 642 | X[stride*2*j+i] = EXTRACT16(PSHR32(ADD32(tmp1, tmp2), 15)); |
| 643 | X[stride*(2*j+1)+i] = EXTRACT16(PSHR32(SUB32(tmp1, tmp2), 15)); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 644 | } |
| 645 | } |
| 646 | |
| 647 | static int compute_qn(int N, int b, int offset, int pulse_cap, int stereo) |
| 648 | { |
| 649 | static const opus_int16 exp2_table8[8] = |
| 650 | {16384, 17866, 19483, 21247, 23170, 25267, 27554, 30048}; |
| 651 | int qn, qb; |
| 652 | int N2 = 2*N-1; |
| 653 | if (stereo && N==2) |
| 654 | N2--; |
| 655 | /* The upper limit ensures that in a stereo split with itheta==16384, we'll |
| 656 | always have enough bits left over to code at least one pulse in the |
| 657 | side; otherwise it would collapse, since it doesn't get folded. */ |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 658 | qb = celt_sudiv(b+N2*offset, N2); |
| 659 | qb = IMIN(b-pulse_cap-(4<<BITRES), qb); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 660 | |
| 661 | qb = IMIN(8<<BITRES, qb); |
| 662 | |
| 663 | if (qb<(1<<BITRES>>1)) { |
| 664 | qn = 1; |
| 665 | } else { |
| 666 | qn = exp2_table8[qb&0x7]>>(14-(qb>>BITRES)); |
| 667 | qn = (qn+1)>>1<<1; |
| 668 | } |
| 669 | celt_assert(qn <= 256); |
| 670 | return qn; |
| 671 | } |
| 672 | |
| 673 | struct band_ctx { |
| 674 | int encode; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 675 | int resynth; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 676 | const CELTMode *m; |
| 677 | int i; |
| 678 | int intensity; |
| 679 | int spread; |
| 680 | int tf_change; |
| 681 | ec_ctx *ec; |
| 682 | opus_int32 remaining_bits; |
| 683 | const celt_ener *bandE; |
| 684 | opus_uint32 seed; |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 685 | int arch; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 686 | int theta_round; |
| 687 | int disable_inv; |
| 688 | int avoid_split_noise; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 689 | }; |
| 690 | |
| 691 | struct split_ctx { |
| 692 | int inv; |
| 693 | int imid; |
| 694 | int iside; |
| 695 | int delta; |
| 696 | int itheta; |
| 697 | int qalloc; |
| 698 | }; |
| 699 | |
| 700 | static void compute_theta(struct band_ctx *ctx, struct split_ctx *sctx, |
| 701 | celt_norm *X, celt_norm *Y, int N, int *b, int B, int B0, |
| 702 | int LM, |
| 703 | int stereo, int *fill) |
| 704 | { |
| 705 | int qn; |
| 706 | int itheta=0; |
| 707 | int delta; |
| 708 | int imid, iside; |
| 709 | int qalloc; |
| 710 | int pulse_cap; |
| 711 | int offset; |
| 712 | opus_int32 tell; |
| 713 | int inv=0; |
| 714 | int encode; |
| 715 | const CELTMode *m; |
| 716 | int i; |
| 717 | int intensity; |
| 718 | ec_ctx *ec; |
| 719 | const celt_ener *bandE; |
| 720 | |
| 721 | encode = ctx->encode; |
| 722 | m = ctx->m; |
| 723 | i = ctx->i; |
| 724 | intensity = ctx->intensity; |
| 725 | ec = ctx->ec; |
| 726 | bandE = ctx->bandE; |
| 727 | |
| 728 | /* Decide on the resolution to give to the split parameter theta */ |
| 729 | pulse_cap = m->logN[i]+LM*(1<<BITRES); |
| 730 | offset = (pulse_cap>>1) - (stereo&&N==2 ? QTHETA_OFFSET_TWOPHASE : QTHETA_OFFSET); |
| 731 | qn = compute_qn(N, *b, offset, pulse_cap, stereo); |
| 732 | if (stereo && i>=intensity) |
| 733 | qn = 1; |
| 734 | if (encode) |
| 735 | { |
| 736 | /* theta is the atan() of the ratio between the (normalized) |
| 737 | side and mid. With just that parameter, we can re-scale both |
| 738 | mid and side because we know that 1) they have unit norm and |
| 739 | 2) they are orthogonal. */ |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 740 | itheta = stereo_itheta(X, Y, stereo, N, ctx->arch); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 741 | } |
| 742 | tell = ec_tell_frac(ec); |
| 743 | if (qn!=1) |
| 744 | { |
| 745 | if (encode) |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 746 | { |
| 747 | if (!stereo || ctx->theta_round == 0) |
| 748 | { |
| 749 | itheta = (itheta*(opus_int32)qn+8192)>>14; |
| 750 | if (!stereo && ctx->avoid_split_noise && itheta > 0 && itheta < qn) |
| 751 | { |
| 752 | /* Check if the selected value of theta will cause the bit allocation |
| 753 | to inject noise on one side. If so, make sure the energy of that side |
| 754 | is zero. */ |
| 755 | int unquantized = celt_udiv((opus_int32)itheta*16384, qn); |
| 756 | imid = bitexact_cos((opus_int16)unquantized); |
| 757 | iside = bitexact_cos((opus_int16)(16384-unquantized)); |
| 758 | delta = FRAC_MUL16((N-1)<<7,bitexact_log2tan(iside,imid)); |
| 759 | if (delta > *b) |
| 760 | itheta = qn; |
| 761 | else if (delta < -*b) |
| 762 | itheta = 0; |
| 763 | } |
| 764 | } else { |
| 765 | int down; |
| 766 | /* Bias quantization towards itheta=0 and itheta=16384. */ |
| 767 | int bias = itheta > 8192 ? 32767/qn : -32767/qn; |
| 768 | down = IMIN(qn-1, IMAX(0, (itheta*(opus_int32)qn + bias)>>14)); |
| 769 | if (ctx->theta_round < 0) |
| 770 | itheta = down; |
| 771 | else |
| 772 | itheta = down+1; |
| 773 | } |
| 774 | } |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 775 | /* Entropy coding of the angle. We use a uniform pdf for the |
| 776 | time split, a step for stereo, and a triangular one for the rest. */ |
| 777 | if (stereo && N>2) |
| 778 | { |
| 779 | int p0 = 3; |
| 780 | int x = itheta; |
| 781 | int x0 = qn/2; |
| 782 | int ft = p0*(x0+1) + x0; |
| 783 | /* Use a probability of p0 up to itheta=8192 and then use 1 after */ |
| 784 | if (encode) |
| 785 | { |
| 786 | ec_encode(ec,x<=x0?p0*x:(x-1-x0)+(x0+1)*p0,x<=x0?p0*(x+1):(x-x0)+(x0+1)*p0,ft); |
| 787 | } else { |
| 788 | int fs; |
| 789 | fs=ec_decode(ec,ft); |
| 790 | if (fs<(x0+1)*p0) |
| 791 | x=fs/p0; |
| 792 | else |
| 793 | x=x0+1+(fs-(x0+1)*p0); |
| 794 | ec_dec_update(ec,x<=x0?p0*x:(x-1-x0)+(x0+1)*p0,x<=x0?p0*(x+1):(x-x0)+(x0+1)*p0,ft); |
| 795 | itheta = x; |
| 796 | } |
| 797 | } else if (B0>1 || stereo) { |
| 798 | /* Uniform pdf */ |
| 799 | if (encode) |
| 800 | ec_enc_uint(ec, itheta, qn+1); |
| 801 | else |
| 802 | itheta = ec_dec_uint(ec, qn+1); |
| 803 | } else { |
| 804 | int fs=1, ft; |
| 805 | ft = ((qn>>1)+1)*((qn>>1)+1); |
| 806 | if (encode) |
| 807 | { |
| 808 | int fl; |
| 809 | |
| 810 | fs = itheta <= (qn>>1) ? itheta + 1 : qn + 1 - itheta; |
| 811 | fl = itheta <= (qn>>1) ? itheta*(itheta + 1)>>1 : |
| 812 | ft - ((qn + 1 - itheta)*(qn + 2 - itheta)>>1); |
| 813 | |
| 814 | ec_encode(ec, fl, fl+fs, ft); |
| 815 | } else { |
| 816 | /* Triangular pdf */ |
| 817 | int fl=0; |
| 818 | int fm; |
| 819 | fm = ec_decode(ec, ft); |
| 820 | |
| 821 | if (fm < ((qn>>1)*((qn>>1) + 1)>>1)) |
| 822 | { |
| 823 | itheta = (isqrt32(8*(opus_uint32)fm + 1) - 1)>>1; |
| 824 | fs = itheta + 1; |
| 825 | fl = itheta*(itheta + 1)>>1; |
| 826 | } |
| 827 | else |
| 828 | { |
| 829 | itheta = (2*(qn + 1) |
| 830 | - isqrt32(8*(opus_uint32)(ft - fm - 1) + 1))>>1; |
| 831 | fs = qn + 1 - itheta; |
| 832 | fl = ft - ((qn + 1 - itheta)*(qn + 2 - itheta)>>1); |
| 833 | } |
| 834 | |
| 835 | ec_dec_update(ec, fl, fl+fs, ft); |
| 836 | } |
| 837 | } |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 838 | celt_assert(itheta>=0); |
| 839 | itheta = celt_udiv((opus_int32)itheta*16384, qn); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 840 | if (encode && stereo) |
| 841 | { |
| 842 | if (itheta==0) |
| 843 | intensity_stereo(m, X, Y, bandE, i, N); |
| 844 | else |
| 845 | stereo_split(X, Y, N); |
| 846 | } |
| 847 | /* NOTE: Renormalising X and Y *may* help fixed-point a bit at very high rate. |
| 848 | Let's do that at higher complexity */ |
| 849 | } else if (stereo) { |
| 850 | if (encode) |
| 851 | { |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 852 | inv = itheta > 8192 && !ctx->disable_inv; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 853 | if (inv) |
| 854 | { |
| 855 | int j; |
| 856 | for (j=0;j<N;j++) |
| 857 | Y[j] = -Y[j]; |
| 858 | } |
| 859 | intensity_stereo(m, X, Y, bandE, i, N); |
| 860 | } |
| 861 | if (*b>2<<BITRES && ctx->remaining_bits > 2<<BITRES) |
| 862 | { |
| 863 | if (encode) |
| 864 | ec_enc_bit_logp(ec, inv, 2); |
| 865 | else |
| 866 | inv = ec_dec_bit_logp(ec, 2); |
| 867 | } else |
| 868 | inv = 0; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 869 | /* inv flag override to avoid problems with downmixing. */ |
| 870 | if (ctx->disable_inv) |
| 871 | inv = 0; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 872 | itheta = 0; |
| 873 | } |
| 874 | qalloc = ec_tell_frac(ec) - tell; |
| 875 | *b -= qalloc; |
| 876 | |
| 877 | if (itheta == 0) |
| 878 | { |
| 879 | imid = 32767; |
| 880 | iside = 0; |
| 881 | *fill &= (1<<B)-1; |
| 882 | delta = -16384; |
| 883 | } else if (itheta == 16384) |
| 884 | { |
| 885 | imid = 0; |
| 886 | iside = 32767; |
| 887 | *fill &= ((1<<B)-1)<<B; |
| 888 | delta = 16384; |
| 889 | } else { |
| 890 | imid = bitexact_cos((opus_int16)itheta); |
| 891 | iside = bitexact_cos((opus_int16)(16384-itheta)); |
| 892 | /* This is the mid vs side allocation that minimizes squared error |
| 893 | in that band. */ |
| 894 | delta = FRAC_MUL16((N-1)<<7,bitexact_log2tan(iside,imid)); |
| 895 | } |
| 896 | |
| 897 | sctx->inv = inv; |
| 898 | sctx->imid = imid; |
| 899 | sctx->iside = iside; |
| 900 | sctx->delta = delta; |
| 901 | sctx->itheta = itheta; |
| 902 | sctx->qalloc = qalloc; |
| 903 | } |
| 904 | static unsigned quant_band_n1(struct band_ctx *ctx, celt_norm *X, celt_norm *Y, int b, |
| 905 | celt_norm *lowband_out) |
| 906 | { |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 907 | int c; |
| 908 | int stereo; |
| 909 | celt_norm *x = X; |
| 910 | int encode; |
| 911 | ec_ctx *ec; |
| 912 | |
| 913 | encode = ctx->encode; |
| 914 | ec = ctx->ec; |
| 915 | |
| 916 | stereo = Y != NULL; |
| 917 | c=0; do { |
| 918 | int sign=0; |
| 919 | if (ctx->remaining_bits>=1<<BITRES) |
| 920 | { |
| 921 | if (encode) |
| 922 | { |
| 923 | sign = x[0]<0; |
| 924 | ec_enc_bits(ec, sign, 1); |
| 925 | } else { |
| 926 | sign = ec_dec_bits(ec, 1); |
| 927 | } |
| 928 | ctx->remaining_bits -= 1<<BITRES; |
| 929 | b-=1<<BITRES; |
| 930 | } |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 931 | if (ctx->resynth) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 932 | x[0] = sign ? -NORM_SCALING : NORM_SCALING; |
| 933 | x = Y; |
| 934 | } while (++c<1+stereo); |
| 935 | if (lowband_out) |
| 936 | lowband_out[0] = SHR16(X[0],4); |
| 937 | return 1; |
| 938 | } |
| 939 | |
| 940 | /* This function is responsible for encoding and decoding a mono partition. |
| 941 | It can split the band in two and transmit the energy difference with |
| 942 | the two half-bands. It can be called recursively so bands can end up being |
| 943 | split in 8 parts. */ |
| 944 | static unsigned quant_partition(struct band_ctx *ctx, celt_norm *X, |
| 945 | int N, int b, int B, celt_norm *lowband, |
| 946 | int LM, |
| 947 | opus_val16 gain, int fill) |
| 948 | { |
| 949 | const unsigned char *cache; |
| 950 | int q; |
| 951 | int curr_bits; |
| 952 | int imid=0, iside=0; |
| 953 | int B0=B; |
| 954 | opus_val16 mid=0, side=0; |
| 955 | unsigned cm=0; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 956 | celt_norm *Y=NULL; |
| 957 | int encode; |
| 958 | const CELTMode *m; |
| 959 | int i; |
| 960 | int spread; |
| 961 | ec_ctx *ec; |
| 962 | |
| 963 | encode = ctx->encode; |
| 964 | m = ctx->m; |
| 965 | i = ctx->i; |
| 966 | spread = ctx->spread; |
| 967 | ec = ctx->ec; |
| 968 | |
| 969 | /* If we need 1.5 more bit than we can produce, split the band in two. */ |
| 970 | cache = m->cache.bits + m->cache.index[(LM+1)*m->nbEBands+i]; |
| 971 | if (LM != -1 && b > cache[cache[0]]+12 && N>2) |
| 972 | { |
| 973 | int mbits, sbits, delta; |
| 974 | int itheta; |
| 975 | int qalloc; |
| 976 | struct split_ctx sctx; |
| 977 | celt_norm *next_lowband2=NULL; |
| 978 | opus_int32 rebalance; |
| 979 | |
| 980 | N >>= 1; |
| 981 | Y = X+N; |
| 982 | LM -= 1; |
| 983 | if (B==1) |
| 984 | fill = (fill&1)|(fill<<1); |
| 985 | B = (B+1)>>1; |
| 986 | |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 987 | compute_theta(ctx, &sctx, X, Y, N, &b, B, B0, LM, 0, &fill); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 988 | imid = sctx.imid; |
| 989 | iside = sctx.iside; |
| 990 | delta = sctx.delta; |
| 991 | itheta = sctx.itheta; |
| 992 | qalloc = sctx.qalloc; |
| 993 | #ifdef FIXED_POINT |
| 994 | mid = imid; |
| 995 | side = iside; |
| 996 | #else |
| 997 | mid = (1.f/32768)*imid; |
| 998 | side = (1.f/32768)*iside; |
| 999 | #endif |
| 1000 | |
| 1001 | /* Give more bits to low-energy MDCTs than they would otherwise deserve */ |
| 1002 | if (B0>1 && (itheta&0x3fff)) |
| 1003 | { |
| 1004 | if (itheta > 8192) |
| 1005 | /* Rough approximation for pre-echo masking */ |
| 1006 | delta -= delta>>(4-LM); |
| 1007 | else |
| 1008 | /* Corresponds to a forward-masking slope of 1.5 dB per 10 ms */ |
| 1009 | delta = IMIN(0, delta + (N<<BITRES>>(5-LM))); |
| 1010 | } |
| 1011 | mbits = IMAX(0, IMIN(b, (b-delta)/2)); |
| 1012 | sbits = b-mbits; |
| 1013 | ctx->remaining_bits -= qalloc; |
| 1014 | |
| 1015 | if (lowband) |
| 1016 | next_lowband2 = lowband+N; /* >32-bit split case */ |
| 1017 | |
| 1018 | rebalance = ctx->remaining_bits; |
| 1019 | if (mbits >= sbits) |
| 1020 | { |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1021 | cm = quant_partition(ctx, X, N, mbits, B, lowband, LM, |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1022 | MULT16_16_P15(gain,mid), fill); |
| 1023 | rebalance = mbits - (rebalance-ctx->remaining_bits); |
| 1024 | if (rebalance > 3<<BITRES && itheta!=0) |
| 1025 | sbits += rebalance - (3<<BITRES); |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1026 | cm |= quant_partition(ctx, Y, N, sbits, B, next_lowband2, LM, |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1027 | MULT16_16_P15(gain,side), fill>>B)<<(B0>>1); |
| 1028 | } else { |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1029 | cm = quant_partition(ctx, Y, N, sbits, B, next_lowband2, LM, |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1030 | MULT16_16_P15(gain,side), fill>>B)<<(B0>>1); |
| 1031 | rebalance = sbits - (rebalance-ctx->remaining_bits); |
| 1032 | if (rebalance > 3<<BITRES && itheta!=16384) |
| 1033 | mbits += rebalance - (3<<BITRES); |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1034 | cm |= quant_partition(ctx, X, N, mbits, B, lowband, LM, |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1035 | MULT16_16_P15(gain,mid), fill); |
| 1036 | } |
| 1037 | } else { |
| 1038 | /* This is the basic no-split case */ |
| 1039 | q = bits2pulses(m, i, LM, b); |
| 1040 | curr_bits = pulses2bits(m, i, LM, q); |
| 1041 | ctx->remaining_bits -= curr_bits; |
| 1042 | |
| 1043 | /* Ensures we can never bust the budget */ |
| 1044 | while (ctx->remaining_bits < 0 && q > 0) |
| 1045 | { |
| 1046 | ctx->remaining_bits += curr_bits; |
| 1047 | q--; |
| 1048 | curr_bits = pulses2bits(m, i, LM, q); |
| 1049 | ctx->remaining_bits -= curr_bits; |
| 1050 | } |
| 1051 | |
| 1052 | if (q!=0) |
| 1053 | { |
| 1054 | int K = get_pulses(q); |
| 1055 | |
| 1056 | /* Finally do the actual quantization */ |
| 1057 | if (encode) |
| 1058 | { |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1059 | cm = alg_quant(X, N, K, spread, B, ec, gain, ctx->resynth, ctx->arch); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1060 | } else { |
| 1061 | cm = alg_unquant(X, N, K, spread, B, ec, gain); |
| 1062 | } |
| 1063 | } else { |
| 1064 | /* If there's no pulse, fill the band anyway */ |
| 1065 | int j; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1066 | if (ctx->resynth) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1067 | { |
| 1068 | unsigned cm_mask; |
| 1069 | /* B can be as large as 16, so this shift might overflow an int on a |
| 1070 | 16-bit platform; use a long to get defined behavior.*/ |
| 1071 | cm_mask = (unsigned)(1UL<<B)-1; |
| 1072 | fill &= cm_mask; |
| 1073 | if (!fill) |
| 1074 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 1075 | OPUS_CLEAR(X, N); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1076 | } else { |
| 1077 | if (lowband == NULL) |
| 1078 | { |
| 1079 | /* Noise */ |
| 1080 | for (j=0;j<N;j++) |
| 1081 | { |
| 1082 | ctx->seed = celt_lcg_rand(ctx->seed); |
| 1083 | X[j] = (celt_norm)((opus_int32)ctx->seed>>20); |
| 1084 | } |
| 1085 | cm = cm_mask; |
| 1086 | } else { |
| 1087 | /* Folded spectrum */ |
| 1088 | for (j=0;j<N;j++) |
| 1089 | { |
| 1090 | opus_val16 tmp; |
| 1091 | ctx->seed = celt_lcg_rand(ctx->seed); |
| 1092 | /* About 48 dB below the "normal" folding level */ |
| 1093 | tmp = QCONST16(1.0f/256, 10); |
| 1094 | tmp = (ctx->seed)&0x8000 ? tmp : -tmp; |
| 1095 | X[j] = lowband[j]+tmp; |
| 1096 | } |
| 1097 | cm = fill; |
| 1098 | } |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 1099 | renormalise_vector(X, N, gain, ctx->arch); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1100 | } |
| 1101 | } |
| 1102 | } |
| 1103 | } |
| 1104 | |
| 1105 | return cm; |
| 1106 | } |
| 1107 | |
| 1108 | |
| 1109 | /* This function is responsible for encoding and decoding a band for the mono case. */ |
| 1110 | static unsigned quant_band(struct band_ctx *ctx, celt_norm *X, |
| 1111 | int N, int b, int B, celt_norm *lowband, |
| 1112 | int LM, celt_norm *lowband_out, |
| 1113 | opus_val16 gain, celt_norm *lowband_scratch, int fill) |
| 1114 | { |
| 1115 | int N0=N; |
| 1116 | int N_B=N; |
| 1117 | int N_B0; |
| 1118 | int B0=B; |
| 1119 | int time_divide=0; |
| 1120 | int recombine=0; |
| 1121 | int longBlocks; |
| 1122 | unsigned cm=0; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1123 | int k; |
| 1124 | int encode; |
| 1125 | int tf_change; |
| 1126 | |
| 1127 | encode = ctx->encode; |
| 1128 | tf_change = ctx->tf_change; |
| 1129 | |
| 1130 | longBlocks = B0==1; |
| 1131 | |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 1132 | N_B = celt_udiv(N_B, B); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1133 | |
| 1134 | /* Special case for one sample */ |
| 1135 | if (N==1) |
| 1136 | { |
| 1137 | return quant_band_n1(ctx, X, NULL, b, lowband_out); |
| 1138 | } |
| 1139 | |
| 1140 | if (tf_change>0) |
| 1141 | recombine = tf_change; |
| 1142 | /* Band recombining to increase frequency resolution */ |
| 1143 | |
| 1144 | if (lowband_scratch && lowband && (recombine || ((N_B&1) == 0 && tf_change<0) || B0>1)) |
| 1145 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 1146 | OPUS_COPY(lowband_scratch, lowband, N); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1147 | lowband = lowband_scratch; |
| 1148 | } |
| 1149 | |
| 1150 | for (k=0;k<recombine;k++) |
| 1151 | { |
| 1152 | static const unsigned char bit_interleave_table[16]={ |
| 1153 | 0,1,1,1,2,3,3,3,2,3,3,3,2,3,3,3 |
| 1154 | }; |
| 1155 | if (encode) |
| 1156 | haar1(X, N>>k, 1<<k); |
| 1157 | if (lowband) |
| 1158 | haar1(lowband, N>>k, 1<<k); |
| 1159 | fill = bit_interleave_table[fill&0xF]|bit_interleave_table[fill>>4]<<2; |
| 1160 | } |
| 1161 | B>>=recombine; |
| 1162 | N_B<<=recombine; |
| 1163 | |
| 1164 | /* Increasing the time resolution */ |
| 1165 | while ((N_B&1) == 0 && tf_change<0) |
| 1166 | { |
| 1167 | if (encode) |
| 1168 | haar1(X, N_B, B); |
| 1169 | if (lowband) |
| 1170 | haar1(lowband, N_B, B); |
| 1171 | fill |= fill<<B; |
| 1172 | B <<= 1; |
| 1173 | N_B >>= 1; |
| 1174 | time_divide++; |
| 1175 | tf_change++; |
| 1176 | } |
| 1177 | B0=B; |
| 1178 | N_B0 = N_B; |
| 1179 | |
| 1180 | /* Reorganize the samples in time order instead of frequency order */ |
| 1181 | if (B0>1) |
| 1182 | { |
| 1183 | if (encode) |
| 1184 | deinterleave_hadamard(X, N_B>>recombine, B0<<recombine, longBlocks); |
| 1185 | if (lowband) |
| 1186 | deinterleave_hadamard(lowband, N_B>>recombine, B0<<recombine, longBlocks); |
| 1187 | } |
| 1188 | |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1189 | cm = quant_partition(ctx, X, N, b, B, lowband, LM, gain, fill); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1190 | |
| 1191 | /* This code is used by the decoder and by the resynthesis-enabled encoder */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1192 | if (ctx->resynth) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1193 | { |
| 1194 | /* Undo the sample reorganization going from time order to frequency order */ |
| 1195 | if (B0>1) |
| 1196 | interleave_hadamard(X, N_B>>recombine, B0<<recombine, longBlocks); |
| 1197 | |
| 1198 | /* Undo time-freq changes that we did earlier */ |
| 1199 | N_B = N_B0; |
| 1200 | B = B0; |
| 1201 | for (k=0;k<time_divide;k++) |
| 1202 | { |
| 1203 | B >>= 1; |
| 1204 | N_B <<= 1; |
| 1205 | cm |= cm>>B; |
| 1206 | haar1(X, N_B, B); |
| 1207 | } |
| 1208 | |
| 1209 | for (k=0;k<recombine;k++) |
| 1210 | { |
| 1211 | static const unsigned char bit_deinterleave_table[16]={ |
| 1212 | 0x00,0x03,0x0C,0x0F,0x30,0x33,0x3C,0x3F, |
| 1213 | 0xC0,0xC3,0xCC,0xCF,0xF0,0xF3,0xFC,0xFF |
| 1214 | }; |
| 1215 | cm = bit_deinterleave_table[cm]; |
| 1216 | haar1(X, N0>>k, 1<<k); |
| 1217 | } |
| 1218 | B<<=recombine; |
| 1219 | |
| 1220 | /* Scale output for later folding */ |
| 1221 | if (lowband_out) |
| 1222 | { |
| 1223 | int j; |
| 1224 | opus_val16 n; |
| 1225 | n = celt_sqrt(SHL32(EXTEND32(N0),22)); |
| 1226 | for (j=0;j<N0;j++) |
| 1227 | lowband_out[j] = MULT16_16_Q15(n,X[j]); |
| 1228 | } |
| 1229 | cm &= (1<<B)-1; |
| 1230 | } |
| 1231 | return cm; |
| 1232 | } |
| 1233 | |
| 1234 | |
| 1235 | /* This function is responsible for encoding and decoding a band for the stereo case. */ |
| 1236 | static unsigned quant_band_stereo(struct band_ctx *ctx, celt_norm *X, celt_norm *Y, |
| 1237 | int N, int b, int B, celt_norm *lowband, |
| 1238 | int LM, celt_norm *lowband_out, |
| 1239 | celt_norm *lowband_scratch, int fill) |
| 1240 | { |
| 1241 | int imid=0, iside=0; |
| 1242 | int inv = 0; |
| 1243 | opus_val16 mid=0, side=0; |
| 1244 | unsigned cm=0; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1245 | int mbits, sbits, delta; |
| 1246 | int itheta; |
| 1247 | int qalloc; |
| 1248 | struct split_ctx sctx; |
| 1249 | int orig_fill; |
| 1250 | int encode; |
| 1251 | ec_ctx *ec; |
| 1252 | |
| 1253 | encode = ctx->encode; |
| 1254 | ec = ctx->ec; |
| 1255 | |
| 1256 | /* Special case for one sample */ |
| 1257 | if (N==1) |
| 1258 | { |
| 1259 | return quant_band_n1(ctx, X, Y, b, lowband_out); |
| 1260 | } |
| 1261 | |
| 1262 | orig_fill = fill; |
| 1263 | |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1264 | compute_theta(ctx, &sctx, X, Y, N, &b, B, B, LM, 1, &fill); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1265 | inv = sctx.inv; |
| 1266 | imid = sctx.imid; |
| 1267 | iside = sctx.iside; |
| 1268 | delta = sctx.delta; |
| 1269 | itheta = sctx.itheta; |
| 1270 | qalloc = sctx.qalloc; |
| 1271 | #ifdef FIXED_POINT |
| 1272 | mid = imid; |
| 1273 | side = iside; |
| 1274 | #else |
| 1275 | mid = (1.f/32768)*imid; |
| 1276 | side = (1.f/32768)*iside; |
| 1277 | #endif |
| 1278 | |
| 1279 | /* This is a special case for N=2 that only works for stereo and takes |
| 1280 | advantage of the fact that mid and side are orthogonal to encode |
| 1281 | the side with just one bit. */ |
| 1282 | if (N==2) |
| 1283 | { |
| 1284 | int c; |
| 1285 | int sign=0; |
| 1286 | celt_norm *x2, *y2; |
| 1287 | mbits = b; |
| 1288 | sbits = 0; |
| 1289 | /* Only need one bit for the side. */ |
| 1290 | if (itheta != 0 && itheta != 16384) |
| 1291 | sbits = 1<<BITRES; |
| 1292 | mbits -= sbits; |
| 1293 | c = itheta > 8192; |
| 1294 | ctx->remaining_bits -= qalloc+sbits; |
| 1295 | |
| 1296 | x2 = c ? Y : X; |
| 1297 | y2 = c ? X : Y; |
| 1298 | if (sbits) |
| 1299 | { |
| 1300 | if (encode) |
| 1301 | { |
| 1302 | /* Here we only need to encode a sign for the side. */ |
| 1303 | sign = x2[0]*y2[1] - x2[1]*y2[0] < 0; |
| 1304 | ec_enc_bits(ec, sign, 1); |
| 1305 | } else { |
| 1306 | sign = ec_dec_bits(ec, 1); |
| 1307 | } |
| 1308 | } |
| 1309 | sign = 1-2*sign; |
| 1310 | /* We use orig_fill here because we want to fold the side, but if |
| 1311 | itheta==16384, we'll have cleared the low bits of fill. */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1312 | cm = quant_band(ctx, x2, N, mbits, B, lowband, LM, lowband_out, Q15ONE, |
| 1313 | lowband_scratch, orig_fill); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1314 | /* We don't split N=2 bands, so cm is either 1 or 0 (for a fold-collapse), |
| 1315 | and there's no need to worry about mixing with the other channel. */ |
| 1316 | y2[0] = -sign*x2[1]; |
| 1317 | y2[1] = sign*x2[0]; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1318 | if (ctx->resynth) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1319 | { |
| 1320 | celt_norm tmp; |
| 1321 | X[0] = MULT16_16_Q15(mid, X[0]); |
| 1322 | X[1] = MULT16_16_Q15(mid, X[1]); |
| 1323 | Y[0] = MULT16_16_Q15(side, Y[0]); |
| 1324 | Y[1] = MULT16_16_Q15(side, Y[1]); |
| 1325 | tmp = X[0]; |
| 1326 | X[0] = SUB16(tmp,Y[0]); |
| 1327 | Y[0] = ADD16(tmp,Y[0]); |
| 1328 | tmp = X[1]; |
| 1329 | X[1] = SUB16(tmp,Y[1]); |
| 1330 | Y[1] = ADD16(tmp,Y[1]); |
| 1331 | } |
| 1332 | } else { |
| 1333 | /* "Normal" split code */ |
| 1334 | opus_int32 rebalance; |
| 1335 | |
| 1336 | mbits = IMAX(0, IMIN(b, (b-delta)/2)); |
| 1337 | sbits = b-mbits; |
| 1338 | ctx->remaining_bits -= qalloc; |
| 1339 | |
| 1340 | rebalance = ctx->remaining_bits; |
| 1341 | if (mbits >= sbits) |
| 1342 | { |
| 1343 | /* In stereo mode, we do not apply a scaling to the mid because we need the normalized |
| 1344 | mid for folding later. */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1345 | cm = quant_band(ctx, X, N, mbits, B, lowband, LM, lowband_out, Q15ONE, |
| 1346 | lowband_scratch, fill); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1347 | rebalance = mbits - (rebalance-ctx->remaining_bits); |
| 1348 | if (rebalance > 3<<BITRES && itheta!=0) |
| 1349 | sbits += rebalance - (3<<BITRES); |
| 1350 | |
| 1351 | /* For a stereo split, the high bits of fill are always zero, so no |
| 1352 | folding will be done to the side. */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1353 | cm |= quant_band(ctx, Y, N, sbits, B, NULL, LM, NULL, side, NULL, fill>>B); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1354 | } else { |
| 1355 | /* For a stereo split, the high bits of fill are always zero, so no |
| 1356 | folding will be done to the side. */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1357 | cm = quant_band(ctx, Y, N, sbits, B, NULL, LM, NULL, side, NULL, fill>>B); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1358 | rebalance = sbits - (rebalance-ctx->remaining_bits); |
| 1359 | if (rebalance > 3<<BITRES && itheta!=16384) |
| 1360 | mbits += rebalance - (3<<BITRES); |
| 1361 | /* In stereo mode, we do not apply a scaling to the mid because we need the normalized |
| 1362 | mid for folding later. */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1363 | cm |= quant_band(ctx, X, N, mbits, B, lowband, LM, lowband_out, Q15ONE, |
| 1364 | lowband_scratch, fill); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1365 | } |
| 1366 | } |
| 1367 | |
| 1368 | |
| 1369 | /* This code is used by the decoder and by the resynthesis-enabled encoder */ |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1370 | if (ctx->resynth) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1371 | { |
| 1372 | if (N!=2) |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 1373 | stereo_merge(X, Y, mid, N, ctx->arch); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1374 | if (inv) |
| 1375 | { |
| 1376 | int j; |
| 1377 | for (j=0;j<N;j++) |
| 1378 | Y[j] = -Y[j]; |
| 1379 | } |
| 1380 | } |
| 1381 | return cm; |
| 1382 | } |
| 1383 | |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1384 | static void special_hybrid_folding(const CELTMode *m, celt_norm *norm, celt_norm *norm2, int start, int M, int dual_stereo) |
| 1385 | { |
| 1386 | int n1, n2; |
| 1387 | const opus_int16 * OPUS_RESTRICT eBands = m->eBands; |
| 1388 | n1 = M*(eBands[start+1]-eBands[start]); |
| 1389 | n2 = M*(eBands[start+2]-eBands[start+1]); |
| 1390 | /* Duplicate enough of the first band folding data to be able to fold the second band. |
| 1391 | Copies no data for CELT-only mode. */ |
| 1392 | OPUS_COPY(&norm[n1], &norm[2*n1 - n2], n2-n1); |
| 1393 | if (dual_stereo) |
| 1394 | OPUS_COPY(&norm2[n1], &norm2[2*n1 - n2], n2-n1); |
| 1395 | } |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1396 | |
| 1397 | void quant_all_bands(int encode, const CELTMode *m, int start, int end, |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 1398 | celt_norm *X_, celt_norm *Y_, unsigned char *collapse_masks, |
| 1399 | const celt_ener *bandE, int *pulses, int shortBlocks, int spread, |
| 1400 | int dual_stereo, int intensity, int *tf_res, opus_int32 total_bits, |
| 1401 | opus_int32 balance, ec_ctx *ec, int LM, int codedBands, |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1402 | opus_uint32 *seed, int complexity, int arch, int disable_inv) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1403 | { |
| 1404 | int i; |
| 1405 | opus_int32 remaining_bits; |
| 1406 | const opus_int16 * OPUS_RESTRICT eBands = m->eBands; |
| 1407 | celt_norm * OPUS_RESTRICT norm, * OPUS_RESTRICT norm2; |
| 1408 | VARDECL(celt_norm, _norm); |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1409 | VARDECL(celt_norm, _lowband_scratch); |
| 1410 | VARDECL(celt_norm, X_save); |
| 1411 | VARDECL(celt_norm, Y_save); |
| 1412 | VARDECL(celt_norm, X_save2); |
| 1413 | VARDECL(celt_norm, Y_save2); |
| 1414 | VARDECL(celt_norm, norm_save2); |
| 1415 | int resynth_alloc; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1416 | celt_norm *lowband_scratch; |
| 1417 | int B; |
| 1418 | int M; |
| 1419 | int lowband_offset; |
| 1420 | int update_lowband = 1; |
| 1421 | int C = Y_ != NULL ? 2 : 1; |
| 1422 | int norm_offset; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1423 | int theta_rdo = encode && Y_!=NULL && !dual_stereo && complexity>=8; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1424 | #ifdef RESYNTH |
| 1425 | int resynth = 1; |
| 1426 | #else |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1427 | int resynth = !encode || theta_rdo; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1428 | #endif |
| 1429 | struct band_ctx ctx; |
| 1430 | SAVE_STACK; |
| 1431 | |
| 1432 | M = 1<<LM; |
| 1433 | B = shortBlocks ? M : 1; |
| 1434 | norm_offset = M*eBands[start]; |
| 1435 | /* No need to allocate norm for the last band because we don't need an |
| 1436 | output in that band. */ |
| 1437 | ALLOC(_norm, C*(M*eBands[m->nbEBands-1]-norm_offset), celt_norm); |
| 1438 | norm = _norm; |
| 1439 | norm2 = norm + M*eBands[m->nbEBands-1]-norm_offset; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1440 | |
| 1441 | /* For decoding, we can use the last band as scratch space because we don't need that |
| 1442 | scratch space for the last band and we don't care about the data there until we're |
| 1443 | decoding the last band. */ |
| 1444 | if (encode && resynth) |
| 1445 | resynth_alloc = M*(eBands[m->nbEBands]-eBands[m->nbEBands-1]); |
| 1446 | else |
| 1447 | resynth_alloc = ALLOC_NONE; |
| 1448 | ALLOC(_lowband_scratch, resynth_alloc, celt_norm); |
| 1449 | if (encode && resynth) |
| 1450 | lowband_scratch = _lowband_scratch; |
| 1451 | else |
| 1452 | lowband_scratch = X_+M*eBands[m->nbEBands-1]; |
| 1453 | ALLOC(X_save, resynth_alloc, celt_norm); |
| 1454 | ALLOC(Y_save, resynth_alloc, celt_norm); |
| 1455 | ALLOC(X_save2, resynth_alloc, celt_norm); |
| 1456 | ALLOC(Y_save2, resynth_alloc, celt_norm); |
| 1457 | ALLOC(norm_save2, resynth_alloc, celt_norm); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1458 | |
| 1459 | lowband_offset = 0; |
| 1460 | ctx.bandE = bandE; |
| 1461 | ctx.ec = ec; |
| 1462 | ctx.encode = encode; |
| 1463 | ctx.intensity = intensity; |
| 1464 | ctx.m = m; |
| 1465 | ctx.seed = *seed; |
| 1466 | ctx.spread = spread; |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 1467 | ctx.arch = arch; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1468 | ctx.disable_inv = disable_inv; |
| 1469 | ctx.resynth = resynth; |
| 1470 | ctx.theta_round = 0; |
| 1471 | /* Avoid injecting noise in the first band on transients. */ |
| 1472 | ctx.avoid_split_noise = B > 1; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1473 | for (i=start;i<end;i++) |
| 1474 | { |
| 1475 | opus_int32 tell; |
| 1476 | int b; |
| 1477 | int N; |
| 1478 | opus_int32 curr_balance; |
| 1479 | int effective_lowband=-1; |
| 1480 | celt_norm * OPUS_RESTRICT X, * OPUS_RESTRICT Y; |
| 1481 | int tf_change=0; |
| 1482 | unsigned x_cm; |
| 1483 | unsigned y_cm; |
| 1484 | int last; |
| 1485 | |
| 1486 | ctx.i = i; |
| 1487 | last = (i==end-1); |
| 1488 | |
| 1489 | X = X_+M*eBands[i]; |
| 1490 | if (Y_!=NULL) |
| 1491 | Y = Y_+M*eBands[i]; |
| 1492 | else |
| 1493 | Y = NULL; |
| 1494 | N = M*eBands[i+1]-M*eBands[i]; |
| 1495 | tell = ec_tell_frac(ec); |
| 1496 | |
| 1497 | /* Compute how many bits we want to allocate to this band */ |
| 1498 | if (i != start) |
| 1499 | balance -= tell; |
| 1500 | remaining_bits = total_bits-tell-1; |
| 1501 | ctx.remaining_bits = remaining_bits; |
| 1502 | if (i <= codedBands-1) |
| 1503 | { |
flim | c91ee5b | 2016-01-26 14:33:44 +0100 | [diff] [blame] | 1504 | curr_balance = celt_sudiv(balance, IMIN(3, codedBands-i)); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1505 | b = IMAX(0, IMIN(16383, IMIN(remaining_bits+1,pulses[i]+curr_balance))); |
| 1506 | } else { |
| 1507 | b = 0; |
| 1508 | } |
| 1509 | |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1510 | #ifdef ENABLE_UPDATE_DRAFT |
| 1511 | if (resynth && (M*eBands[i]-N >= M*eBands[start] || i==start+1) && (update_lowband || lowband_offset==0)) |
| 1512 | lowband_offset = i; |
| 1513 | if (i == start+1) |
| 1514 | special_hybrid_folding(m, norm, norm2, start, M, dual_stereo); |
| 1515 | #else |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1516 | if (resynth && M*eBands[i]-N >= M*eBands[start] && (update_lowband || lowband_offset==0)) |
| 1517 | lowband_offset = i; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1518 | #endif |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1519 | |
| 1520 | tf_change = tf_res[i]; |
| 1521 | ctx.tf_change = tf_change; |
| 1522 | if (i>=m->effEBands) |
| 1523 | { |
| 1524 | X=norm; |
| 1525 | if (Y_!=NULL) |
| 1526 | Y = norm; |
| 1527 | lowband_scratch = NULL; |
| 1528 | } |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1529 | if (last && !theta_rdo) |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1530 | lowband_scratch = NULL; |
| 1531 | |
| 1532 | /* Get a conservative estimate of the collapse_mask's for the bands we're |
| 1533 | going to be folding from. */ |
| 1534 | if (lowband_offset != 0 && (spread!=SPREAD_AGGRESSIVE || B>1 || tf_change<0)) |
| 1535 | { |
| 1536 | int fold_start; |
| 1537 | int fold_end; |
| 1538 | int fold_i; |
| 1539 | /* This ensures we never repeat spectral content within one band */ |
| 1540 | effective_lowband = IMAX(0, M*eBands[lowband_offset]-norm_offset-N); |
| 1541 | fold_start = lowband_offset; |
| 1542 | while(M*eBands[--fold_start] > effective_lowband+norm_offset); |
| 1543 | fold_end = lowband_offset-1; |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1544 | #ifdef ENABLE_UPDATE_DRAFT |
| 1545 | while(++fold_end < i && M*eBands[fold_end] < effective_lowband+norm_offset+N); |
| 1546 | #else |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1547 | while(M*eBands[++fold_end] < effective_lowband+norm_offset+N); |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1548 | #endif |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1549 | x_cm = y_cm = 0; |
| 1550 | fold_i = fold_start; do { |
| 1551 | x_cm |= collapse_masks[fold_i*C+0]; |
| 1552 | y_cm |= collapse_masks[fold_i*C+C-1]; |
| 1553 | } while (++fold_i<fold_end); |
| 1554 | } |
| 1555 | /* Otherwise, we'll be using the LCG to fold, so all blocks will (almost |
| 1556 | always) be non-zero. */ |
| 1557 | else |
| 1558 | x_cm = y_cm = (1<<B)-1; |
| 1559 | |
| 1560 | if (dual_stereo && i==intensity) |
| 1561 | { |
| 1562 | int j; |
| 1563 | |
| 1564 | /* Switch off dual stereo to do intensity. */ |
| 1565 | dual_stereo = 0; |
| 1566 | if (resynth) |
| 1567 | for (j=0;j<M*eBands[i]-norm_offset;j++) |
| 1568 | norm[j] = HALF32(norm[j]+norm2[j]); |
| 1569 | } |
| 1570 | if (dual_stereo) |
| 1571 | { |
| 1572 | x_cm = quant_band(&ctx, X, N, b/2, B, |
| 1573 | effective_lowband != -1 ? norm+effective_lowband : NULL, LM, |
| 1574 | last?NULL:norm+M*eBands[i]-norm_offset, Q15ONE, lowband_scratch, x_cm); |
| 1575 | y_cm = quant_band(&ctx, Y, N, b/2, B, |
| 1576 | effective_lowband != -1 ? norm2+effective_lowband : NULL, LM, |
| 1577 | last?NULL:norm2+M*eBands[i]-norm_offset, Q15ONE, lowband_scratch, y_cm); |
| 1578 | } else { |
| 1579 | if (Y!=NULL) |
| 1580 | { |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1581 | if (theta_rdo && i < intensity) |
| 1582 | { |
| 1583 | ec_ctx ec_save, ec_save2; |
| 1584 | struct band_ctx ctx_save, ctx_save2; |
| 1585 | opus_val32 dist0, dist1; |
| 1586 | unsigned cm, cm2; |
| 1587 | int nstart_bytes, nend_bytes, save_bytes; |
| 1588 | unsigned char *bytes_buf; |
| 1589 | unsigned char bytes_save[1275]; |
| 1590 | opus_val16 w[2]; |
| 1591 | compute_channel_weights(bandE[i], bandE[i+m->nbEBands], w); |
| 1592 | /* Make a copy. */ |
| 1593 | cm = x_cm|y_cm; |
| 1594 | ec_save = *ec; |
| 1595 | ctx_save = ctx; |
| 1596 | OPUS_COPY(X_save, X, N); |
| 1597 | OPUS_COPY(Y_save, Y, N); |
| 1598 | /* Encode and round down. */ |
| 1599 | ctx.theta_round = -1; |
| 1600 | x_cm = quant_band_stereo(&ctx, X, Y, N, b, B, |
| 1601 | effective_lowband != -1 ? norm+effective_lowband : NULL, LM, |
| 1602 | last?NULL:norm+M*eBands[i]-norm_offset, lowband_scratch, cm); |
| 1603 | dist0 = MULT16_32_Q15(w[0], celt_inner_prod(X_save, X, N, arch)) + MULT16_32_Q15(w[1], celt_inner_prod(Y_save, Y, N, arch)); |
| 1604 | |
| 1605 | /* Save first result. */ |
| 1606 | cm2 = x_cm; |
| 1607 | ec_save2 = *ec; |
| 1608 | ctx_save2 = ctx; |
| 1609 | OPUS_COPY(X_save2, X, N); |
| 1610 | OPUS_COPY(Y_save2, Y, N); |
| 1611 | if (!last) |
| 1612 | OPUS_COPY(norm_save2, norm+M*eBands[i]-norm_offset, N); |
| 1613 | nstart_bytes = ec_save.offs; |
| 1614 | nend_bytes = ec_save.storage; |
| 1615 | bytes_buf = ec_save.buf+nstart_bytes; |
| 1616 | save_bytes = nend_bytes-nstart_bytes; |
| 1617 | OPUS_COPY(bytes_save, bytes_buf, save_bytes); |
| 1618 | |
| 1619 | /* Restore */ |
| 1620 | *ec = ec_save; |
| 1621 | ctx = ctx_save; |
| 1622 | OPUS_COPY(X, X_save, N); |
| 1623 | OPUS_COPY(Y, Y_save, N); |
| 1624 | if (i == start+1) |
| 1625 | special_hybrid_folding(m, norm, norm2, start, M, dual_stereo); |
| 1626 | /* Encode and round up. */ |
| 1627 | ctx.theta_round = 1; |
| 1628 | x_cm = quant_band_stereo(&ctx, X, Y, N, b, B, |
| 1629 | effective_lowband != -1 ? norm+effective_lowband : NULL, LM, |
| 1630 | last?NULL:norm+M*eBands[i]-norm_offset, lowband_scratch, cm); |
| 1631 | dist1 = MULT16_32_Q15(w[0], celt_inner_prod(X_save, X, N, arch)) + MULT16_32_Q15(w[1], celt_inner_prod(Y_save, Y, N, arch)); |
| 1632 | if (dist0 >= dist1) { |
| 1633 | x_cm = cm2; |
| 1634 | *ec = ec_save2; |
| 1635 | ctx = ctx_save2; |
| 1636 | OPUS_COPY(X, X_save2, N); |
| 1637 | OPUS_COPY(Y, Y_save2, N); |
| 1638 | if (!last) |
| 1639 | OPUS_COPY(norm+M*eBands[i]-norm_offset, norm_save2, N); |
| 1640 | OPUS_COPY(bytes_buf, bytes_save, save_bytes); |
| 1641 | } |
| 1642 | } else { |
| 1643 | ctx.theta_round = 0; |
| 1644 | x_cm = quant_band_stereo(&ctx, X, Y, N, b, B, |
| 1645 | effective_lowband != -1 ? norm+effective_lowband : NULL, LM, |
| 1646 | last?NULL:norm+M*eBands[i]-norm_offset, lowband_scratch, x_cm|y_cm); |
| 1647 | } |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1648 | } else { |
| 1649 | x_cm = quant_band(&ctx, X, N, b, B, |
| 1650 | effective_lowband != -1 ? norm+effective_lowband : NULL, LM, |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1651 | last?NULL:norm+M*eBands[i]-norm_offset, Q15ONE, lowband_scratch, x_cm|y_cm); |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1652 | } |
| 1653 | y_cm = x_cm; |
| 1654 | } |
| 1655 | collapse_masks[i*C+0] = (unsigned char)x_cm; |
| 1656 | collapse_masks[i*C+C-1] = (unsigned char)y_cm; |
| 1657 | balance += pulses[i] + tell; |
| 1658 | |
| 1659 | /* Update the folding position only as long as we have 1 bit/sample depth. */ |
| 1660 | update_lowband = b>(N<<BITRES); |
Felicia Lim | 0c2090c | 2017-07-05 17:36:56 -0700 | [diff] [blame] | 1661 | /* We only need to avoid noise on a split for the first band. After that, we |
| 1662 | have folding. */ |
| 1663 | ctx.avoid_split_noise = 0; |
Vignesh Venkatasubramanian | 2bd8b54 | 2014-02-20 10:50:35 -0800 | [diff] [blame] | 1664 | } |
| 1665 | *seed = ctx.seed; |
| 1666 | |
| 1667 | RESTORE_STACK; |
| 1668 | } |
| 1669 | |