Add copy of opus library in deps/third_party.

opus/celt/modes.c

+/* Copyright (c) 2007-2008 CSIRO
+   Copyright (c) 2007-2009 Xiph.Org Foundation
+   Copyright (c) 2008 Gregory Maxwell
+   Written by Jean-Marc Valin and Gregory Maxwell */
+/*
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+   - Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "celt.h"
+#include "modes.h"
+#include "rate.h"
+#include "os_support.h"
+#include "stack_alloc.h"
+#include "quant_bands.h"
+
+static const opus_int16 eband5ms[] = {
+/*0  200 400 600 800  1k 1.2 1.4 1.6  2k 2.4 2.8 3.2  4k 4.8 5.6 6.8  8k 9.6 12k 15.6 */
+  0,  1,  2,  3,  4,  5,  6,  7,  8, 10, 12, 14, 16, 20, 24, 28, 34, 40, 48, 60, 78, 100
+};
+
+/* Alternate tuning (partially derived from Vorbis) */
+#define BITALLOC_SIZE 11
+/* Bit allocation table in units of 1/32 bit/sample (0.1875 dB SNR) */
+static const unsigned char band_allocation[] = {
+/*0  200 400 600 800  1k 1.2 1.4 1.6  2k 2.4 2.8 3.2  4k 4.8 5.6 6.8  8k 9.6 12k 15.6 */
+  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+ 90, 80, 75, 69, 63, 56, 49, 40, 34, 29, 20, 18, 10,  0,  0,  0,  0,  0,  0,  0,  0,
+110,100, 90, 84, 78, 71, 65, 58, 51, 45, 39, 32, 26, 20, 12,  0,  0,  0,  0,  0,  0,
+118,110,103, 93, 86, 80, 75, 70, 65, 59, 53, 47, 40, 31, 23, 15,  4,  0,  0,  0,  0,
+126,119,112,104, 95, 89, 83, 78, 72, 66, 60, 54, 47, 39, 32, 25, 17, 12,  1,  0,  0,
+134,127,120,114,103, 97, 91, 85, 78, 72, 66, 60, 54, 47, 41, 35, 29, 23, 16, 10,  1,
+144,137,130,124,113,107,101, 95, 88, 82, 76, 70, 64, 57, 51, 45, 39, 33, 26, 15,  1,
+152,145,138,132,123,117,111,105, 98, 92, 86, 80, 74, 67, 61, 55, 49, 43, 36, 20,  1,
+162,155,148,142,133,127,121,115,108,102, 96, 90, 84, 77, 71, 65, 59, 53, 46, 30,  1,
+172,165,158,152,143,137,131,125,118,112,106,100, 94, 87, 81, 75, 69, 63, 56, 45, 20,
+200,200,200,200,200,200,200,200,198,193,188,183,178,173,168,163,158,153,148,129,104,
+};
+
+#ifndef CUSTOM_MODES_ONLY
+ #ifdef FIXED_POINT
+  #include "static_modes_fixed.h"
+ #else
+  #include "static_modes_float.h"
+ #endif
+#endif /* CUSTOM_MODES_ONLY */
+
+#ifndef M_PI
+#define M_PI 3.141592653
+#endif
+
+#ifdef CUSTOM_MODES
+
+/* Defining 25 critical bands for the full 0-20 kHz audio bandwidth
+   Taken from http://ccrma.stanford.edu/~jos/bbt/Bark_Frequency_Scale.html */
+#define BARK_BANDS 25
+static const opus_int16 bark_freq[BARK_BANDS+1] = {
+      0,   100,   200,   300,   400,
+    510,   630,   770,   920,  1080,
+   1270,  1480,  1720,  2000,  2320,
+   2700,  3150,  3700,  4400,  5300,
+   6400,  7700,  9500, 12000, 15500,
+  20000};
+
+static opus_int16 *compute_ebands(opus_int32 Fs, int frame_size, int res, int *nbEBands)
+{
+   opus_int16 *eBands;
+   int i, j, lin, low, high, nBark, offset=0;
+
+   /* All modes that have 2.5 ms short blocks use the same definition */
+   if (Fs == 400*(opus_int32)frame_size)
+   {
+      *nbEBands = sizeof(eband5ms)/sizeof(eband5ms[0])-1;
+      eBands = opus_alloc(sizeof(opus_int16)*(*nbEBands+1));
+      for (i=0;i<*nbEBands+1;i++)
+         eBands[i] = eband5ms[i];
+      return eBands;
+   }
+   /* Find the number of critical bands supported by our sampling rate */
+   for (nBark=1;nBark<BARK_BANDS;nBark++)
+    if (bark_freq[nBark+1]*2 >= Fs)
+       break;
+
+   /* Find where the linear part ends (i.e. where the spacing is more than min_width */
+   for (lin=0;lin<nBark;lin++)
+      if (bark_freq[lin+1]-bark_freq[lin] >= res)
+         break;
+
+   low = (bark_freq[lin]+res/2)/res;
+   high = nBark-lin;
+   *nbEBands = low+high;
+   eBands = opus_alloc(sizeof(opus_int16)*(*nbEBands+2));
+
+   if (eBands==NULL)
+      return NULL;
+
+   /* Linear spacing (min_width) */
+   for (i=0;i<low;i++)
+      eBands[i] = i;
+   if (low>0)
+      offset = eBands[low-1]*res - bark_freq[lin-1];
+   /* Spacing follows critical bands */
+   for (i=0;i<high;i++)
+   {
+      int target = bark_freq[lin+i];
+      /* Round to an even value */
+      eBands[i+low] = (target+offset/2+res)/(2*res)*2;
+      offset = eBands[i+low]*res - target;
+   }
+   /* Enforce the minimum spacing at the boundary */
+   for (i=0;i<*nbEBands;i++)
+      if (eBands[i] < i)
+         eBands[i] = i;
+   /* Round to an even value */
+   eBands[*nbEBands] = (bark_freq[nBark]+res)/(2*res)*2;
+   if (eBands[*nbEBands] > frame_size)
+      eBands[*nbEBands] = frame_size;
+   for (i=1;i<*nbEBands-1;i++)
+   {
+      if (eBands[i+1]-eBands[i] < eBands[i]-eBands[i-1])
+      {
+         eBands[i] -= (2*eBands[i]-eBands[i-1]-eBands[i+1])/2;
+      }
+   }
+   /* Remove any empty bands. */
+   for (i=j=0;i<*nbEBands;i++)
+      if(eBands[i+1]>eBands[j])
+         eBands[++j]=eBands[i+1];
+   *nbEBands=j;
+
+   for (i=1;i<*nbEBands;i++)
+   {
+      /* Every band must be smaller than the last band. */
+      celt_assert(eBands[i]-eBands[i-1]<=eBands[*nbEBands]-eBands[*nbEBands-1]);
+      /* Each band must be no larger than twice the size of the previous one. */
+      celt_assert(eBands[i+1]-eBands[i]<=2*(eBands[i]-eBands[i-1]));
+   }
+
+   return eBands;
+}
+
+static void compute_allocation_table(CELTMode *mode)
+{
+   int i, j;
+   unsigned char *allocVectors;
+   int maxBands = sizeof(eband5ms)/sizeof(eband5ms[0])-1;
+
+   mode->nbAllocVectors = BITALLOC_SIZE;
+   allocVectors = opus_alloc(sizeof(unsigned char)*(BITALLOC_SIZE*mode->nbEBands));
+   if (allocVectors==NULL)
+      return;
+
+   /* Check for standard mode */
+   if (mode->Fs == 400*(opus_int32)mode->shortMdctSize)
+   {
+      for (i=0;i<BITALLOC_SIZE*mode->nbEBands;i++)
+         allocVectors[i] = band_allocation[i];
+      mode->allocVectors = allocVectors;
+      return;
+   }
+   /* If not the standard mode, interpolate */
+   /* Compute per-codec-band allocation from per-critical-band matrix */
+   for (i=0;i<BITALLOC_SIZE;i++)
+   {
+      for (j=0;j<mode->nbEBands;j++)
+      {
+         int k;
+         for (k=0;k<maxBands;k++)
+         {
+            if (400*(opus_int32)eband5ms[k] > mode->eBands[j]*(opus_int32)mode->Fs/mode->shortMdctSize)
+               break;
+         }
+         if (k>maxBands-1)
+            allocVectors[i*mode->nbEBands+j] = band_allocation[i*maxBands + maxBands-1];
+         else {
+            opus_int32 a0, a1;
+            a1 = mode->eBands[j]*(opus_int32)mode->Fs/mode->shortMdctSize - 400*(opus_int32)eband5ms[k-1];
+            a0 = 400*(opus_int32)eband5ms[k] - mode->eBands[j]*(opus_int32)mode->Fs/mode->shortMdctSize;
+            allocVectors[i*mode->nbEBands+j] = (a0*band_allocation[i*maxBands+k-1]
+                                             + a1*band_allocation[i*maxBands+k])/(a0+a1);
+         }
+      }
+   }
+
+   /*printf ("\n");
+   for (i=0;i<BITALLOC_SIZE;i++)
+   {
+      for (j=0;j<mode->nbEBands;j++)
+         printf ("%d ", allocVectors[i*mode->nbEBands+j]);
+      printf ("\n");
+   }
+   exit(0);*/
+
+   mode->allocVectors = allocVectors;
+}
+
+#endif /* CUSTOM_MODES */
+
+CELTMode *opus_custom_mode_create(opus_int32 Fs, int frame_size, int *error)
+{
+   int i;
+#ifdef CUSTOM_MODES
+   CELTMode *mode=NULL;
+   int res;
+   opus_val16 *window;
+   opus_int16 *logN;
+   int LM;
+   ALLOC_STACK;
+#if !defined(VAR_ARRAYS) && !defined(USE_ALLOCA)
+   if (global_stack==NULL)
+      goto failure;
+#endif
+#endif
+
+#ifndef CUSTOM_MODES_ONLY
+   for (i=0;i<TOTAL_MODES;i++)
+   {
+      int j;
+      for (j=0;j<4;j++)
+      {
+         if (Fs == static_mode_list[i]->Fs &&
+               (frame_size<<j) == static_mode_list[i]->shortMdctSize*static_mode_list[i]->nbShortMdcts)
+         {
+            if (error)
+               *error = OPUS_OK;
+            return (CELTMode*)static_mode_list[i];
+         }
+      }
+   }
+#endif /* CUSTOM_MODES_ONLY */
+
+#ifndef CUSTOM_MODES
+   if (error)
+      *error = OPUS_BAD_ARG;
+   return NULL;
+#else
+
+   /* The good thing here is that permutation of the arguments will automatically be invalid */
+
+   if (Fs < 8000 || Fs > 96000)
+   {
+      if (error)
+         *error = OPUS_BAD_ARG;
+      return NULL;
+   }
+   if (frame_size < 40 || frame_size > 1024 || frame_size%2!=0)
+   {
+      if (error)
+         *error = OPUS_BAD_ARG;
+      return NULL;
+   }
+   /* Frames of less than 1ms are not supported. */
+   if ((opus_int32)frame_size*1000 < Fs)
+   {
+      if (error)
+         *error = OPUS_BAD_ARG;
+      return NULL;
+   }
+
+   if ((opus_int32)frame_size*75 >= Fs && (frame_size%16)==0)
+   {
+     LM = 3;
+   } else if ((opus_int32)frame_size*150 >= Fs && (frame_size%8)==0)
+   {
+     LM = 2;
+   } else if ((opus_int32)frame_size*300 >= Fs && (frame_size%4)==0)
+   {
+     LM = 1;
+   } else
+   {
+     LM = 0;
+   }
+
+   /* Shorts longer than 3.3ms are not supported. */
+   if ((opus_int32)(frame_size>>LM)*300 > Fs)
+   {
+      if (error)
+         *error = OPUS_BAD_ARG;
+      return NULL;
+   }
+
+   mode = opus_alloc(sizeof(CELTMode));
+   if (mode==NULL)
+      goto failure;
+   mode->Fs = Fs;
+
+   /* Pre/de-emphasis depends on sampling rate. The "standard" pre-emphasis
+      is defined as A(z) = 1 - 0.85*z^-1 at 48 kHz. Other rates should
+      approximate that. */
+   if(Fs < 12000) /* 8 kHz */
+   {
+      mode->preemph[0] =  QCONST16(0.3500061035f, 15);
+      mode->preemph[1] = -QCONST16(0.1799926758f, 15);
+      mode->preemph[2] =  QCONST16(0.2719968125f, SIG_SHIFT); /* exact 1/preemph[3] */
+      mode->preemph[3] =  QCONST16(3.6765136719f, 13);
+   } else if(Fs < 24000) /* 16 kHz */
+   {
+      mode->preemph[0] =  QCONST16(0.6000061035f, 15);
+      mode->preemph[1] = -QCONST16(0.1799926758f, 15);
+      mode->preemph[2] =  QCONST16(0.4424998650f, SIG_SHIFT); /* exact 1/preemph[3] */
+      mode->preemph[3] =  QCONST16(2.2598876953f, 13);
+   } else if(Fs < 40000) /* 32 kHz */
+   {
+      mode->preemph[0] =  QCONST16(0.7799987793f, 15);
+      mode->preemph[1] = -QCONST16(0.1000061035f, 15);
+      mode->preemph[2] =  QCONST16(0.7499771125f, SIG_SHIFT); /* exact 1/preemph[3] */
+      mode->preemph[3] =  QCONST16(1.3333740234f, 13);
+   } else /* 48 kHz */
+   {
+      mode->preemph[0] =  QCONST16(0.8500061035f, 15);
+      mode->preemph[1] =  QCONST16(0.0f, 15);
+      mode->preemph[2] =  QCONST16(1.f, SIG_SHIFT);
+      mode->preemph[3] =  QCONST16(1.f, 13);
+   }
+
+   mode->maxLM = LM;
+   mode->nbShortMdcts = 1<<LM;
+   mode->shortMdctSize = frame_size/mode->nbShortMdcts;
+   res = (mode->Fs+mode->shortMdctSize)/(2*mode->shortMdctSize);
+
+   mode->eBands = compute_ebands(Fs, mode->shortMdctSize, res, &mode->nbEBands);
+   if (mode->eBands==NULL)
+      goto failure;
+
+   mode->effEBands = mode->nbEBands;
+   while (mode->eBands[mode->effEBands] > mode->shortMdctSize)
+      mode->effEBands--;
+
+   /* Overlap must be divisible by 4 */
+   mode->overlap = ((mode->shortMdctSize>>2)<<2);
+
+   compute_allocation_table(mode);
+   if (mode->allocVectors==NULL)
+      goto failure;
+
+   window = (opus_val16*)opus_alloc(mode->overlap*sizeof(opus_val16));
+   if (window==NULL)
+      goto failure;
+
+#ifndef FIXED_POINT
+   for (i=0;i<mode->overlap;i++)
+      window[i] = Q15ONE*sin(.5*M_PI* sin(.5*M_PI*(i+.5)/mode->overlap) * sin(.5*M_PI*(i+.5)/mode->overlap));
+#else
+   for (i=0;i<mode->overlap;i++)
+      window[i] = MIN32(32767,floor(.5+32768.*sin(.5*M_PI* sin(.5*M_PI*(i+.5)/mode->overlap) * sin(.5*M_PI*(i+.5)/mode->overlap))));
+#endif
+   mode->window = window;
+
+   logN = (opus_int16*)opus_alloc(mode->nbEBands*sizeof(opus_int16));
+   if (logN==NULL)
+      goto failure;
+
+   for (i=0;i<mode->nbEBands;i++)
+      logN[i] = log2_frac(mode->eBands[i+1]-mode->eBands[i], BITRES);
+   mode->logN = logN;
+
+   compute_pulse_cache(mode, mode->maxLM);
+
+   if (clt_mdct_init(&mode->mdct, 2*mode->shortMdctSize*mode->nbShortMdcts,
+           mode->maxLM) == 0)
+      goto failure;
+
+   if (error)
+      *error = OPUS_OK;
+
+   return mode;
+failure:
+   if (error)
+      *error = OPUS_ALLOC_FAIL;
+   if (mode!=NULL)
+      opus_custom_mode_destroy(mode);
+   return NULL;
+#endif /* !CUSTOM_MODES */
+}
+
+#ifdef CUSTOM_MODES
+void opus_custom_mode_destroy(CELTMode *mode)
+{
+   if (mode == NULL)
+      return;
+#ifndef CUSTOM_MODES_ONLY
+   {
+     int i;
+     for (i=0;i<TOTAL_MODES;i++)
+     {
+        if (mode == static_mode_list[i])
+        {
+           return;
+        }
+     }
+   }
+#endif /* CUSTOM_MODES_ONLY */
+   opus_free((opus_int16*)mode->eBands);
+   opus_free((opus_int16*)mode->allocVectors);
+
+   opus_free((opus_val16*)mode->window);
+   opus_free((opus_int16*)mode->logN);
+
+   opus_free((opus_int16*)mode->cache.index);
+   opus_free((unsigned char*)mode->cache.bits);
+   opus_free((unsigned char*)mode->cache.caps);
+   clt_mdct_clear(&mode->mdct);
+
+   opus_free((CELTMode *)mode);
+}
+#endif