libcelt/modes.c - platform/external/libopus - Gitiles

 /* 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.

    - Neither the name of the Xiph.org Foundation nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.

    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 FOUNDATION 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 celt_int16 eband5ms[] = {
   0,  1,  2,  3,  4,  5,  6,  7,  8, 10, 12, 14, 16, 20, 24, 28, 34, 40, 48, 60, 78, 100
 };

 #if 0

 #define BITALLOC_SIZE 9
 /* 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,
  95, 90, 80, 75, 65, 60, 55, 50, 44, 40, 35, 30, 15,  1,  0,  0,  0,  0,  0,  0,  0,
 100, 95, 90, 88, 85, 82, 78, 74, 70, 65, 60, 54, 45, 35, 25, 15,  1,  0,  0,  0,  0,
 120,110,110,110,100, 96, 90, 88, 84, 76, 70, 65, 60, 45, 35, 25, 20,  1,  1,  0,  0,
 135,125,125,125,115,112,104,104,100, 96, 83, 78, 70, 55, 46, 36, 32, 28, 20,  8,  0,
 170,165,157,155,149,145,143,138,138,138,129,124,108, 96, 88, 83, 72, 56, 44, 28,  2,
 192,192,160,160,160,160,160,160,160,160,150,140,120,110,100, 90, 80, 70, 60, 50, 20,
 224,224,192,192,192,192,192,192,192,160,160,160,160,160,160,160,160,120, 80, 64, 40,
 255,255,224,224,224,224,224,224,224,192,192,192,192,192,192,192,192,192,192,192,120,
 };

 #else

 /* Alternate tuning (partially derived from Vorbis) */
 #define BITALLOC_SIZE 12
 /* 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,
 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,251,251,239,204,129,104,
 };
 #endif

 #ifndef CUSTOM_MODES_ONLY
  #ifdef FIXED_POINT
   #include "static_modes_fixed.c"
  #else
   #include "static_modes_float.c"
  #endif
 #endif /* CUSTOM_MODES_ONLY */

 #ifndef M_PI
 #define M_PI 3.141592653
 #endif


 int celt_mode_info(const CELTMode *mode, int request, celt_int32 *value)
 {
    switch (request)
    {
       case CELT_GET_LOOKAHEAD:
          *value = mode->overlap;
          break;
       case CELT_GET_BITSTREAM_VERSION:
          *value = CELT_BITSTREAM_VERSION;
          break;
       case CELT_GET_SAMPLE_RATE:
          *value = mode->Fs;
          break;
       default:
          return CELT_UNIMPLEMENTED;
    }
    return CELT_OK;
 }

 #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 celt_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 celt_int16 *compute_ebands(celt_int32 Fs, int frame_size, int res, int *nbEBands)
 {
    celt_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*(celt_int32)frame_size)
    {
       *nbEBands = sizeof(eband5ms)/sizeof(eband5ms[0])-1;
       eBands = celt_alloc(sizeof(celt_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 = celt_alloc(sizeof(celt_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]));
    }

    /*for (i=0;i<=*nbEBands+1;i++)
       printf ("%d ", eBands[i]);
    printf ("\n");
    exit(1);*/
    /* FIXME: Remove last band if too small */
    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 = celt_alloc(sizeof(unsigned char)*(BITALLOC_SIZE*mode->nbEBands));
    if (allocVectors==NULL)
       return;

    /* Check for standard mode */
    if (mode->Fs == 400*(celt_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*(celt_int32)eband5ms[k] > mode->eBands[j]*(celt_int32)mode->Fs/mode->shortMdctSize)
                break;
          }
          if (k>mode->nbEBands-1)
             allocVectors[i*mode->nbEBands+j] = band_allocation[i*maxBands + maxBands-1];
          else {
             celt_int32 a0, a1;
             a1 = mode->eBands[j]*(celt_int32)mode->Fs/mode->shortMdctSize - 400*(celt_int32)eband5ms[k-1];
             a0 = 400*(celt_int32)eband5ms[k] - mode->eBands[j]*(celt_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 *celt_mode_create(celt_int32 Fs, int frame_size, int *error)
 {
    int i;
    int res;
    CELTMode *mode=NULL;
    celt_word16 *window;
    celt_int16 *logN;
    int LM;
 #ifdef STDIN_TUNING
    scanf("%d ", &MIN_BINS);
    scanf("%d ", &BITALLOC_SIZE);
    band_allocation = celt_alloc(sizeof(int)*BARK_BANDS*BITALLOC_SIZE);
    for (i=0;i<BARK_BANDS*BITALLOC_SIZE;i++)
    {
       scanf("%d ", band_allocation+i);
    }
 #endif
    ALLOC_STACK;
 #if !defined(VAR_ARRAYS) && !defined(USE_ALLOCA)
    if (global_stack==NULL)
       goto failure;
 #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 = CELT_OK;
             return (CELTMode*)static_mode_list[i];
          }
       }
    }
 #endif /* CUSTOM_MODES_ONLY */

 #ifndef CUSTOM_MODES
    if (error)
       *error = CELT_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 = CELT_BAD_ARG;
       return NULL;
    }
    if (frame_size < 40 || frame_size > 1024 || frame_size%2!=0)
    {
       if (error)
          *error = CELT_BAD_ARG;
       return NULL;
    }

    mode = celt_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);
    }

    if ((celt_int32)frame_size*75 >= Fs && (frame_size%16)==0)
    {
      LM = 3;
    } else if ((celt_int32)frame_size*150 >= Fs && (frame_size%8)==0)
    {
      LM = 2;
    } else if ((celt_int32)frame_size*300 >= Fs && (frame_size%4)==0)
    {
      LM = 1;
    } else
    {
      LM = 0;
    }

    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 = (celt_word16*)celt_alloc(mode->overlap*sizeof(celt_word16));
    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 = (celt_int16*)celt_alloc(mode->nbEBands*sizeof(celt_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);

    clt_mdct_init(&mode->mdct, 2*mode->shortMdctSize*mode->nbShortMdcts, mode->maxLM);
    if ((mode->mdct.trig==NULL)
 #ifndef ENABLE_TI_DSPLIB55
          || (mode->mdct.kfft==NULL)
 #endif
    )
       goto failure;

    if (error)
       *error = CELT_OK;

    return mode;
 failure:
    if (error)
       *error = CELT_INVALID_MODE;
    if (mode!=NULL)
       celt_mode_destroy(mode);
    return NULL;
 #endif /* !CUSTOM_MODES */
 }

 void celt_mode_destroy(CELTMode *mode)
 {
 #ifdef CUSTOM_MODES
    int i;
    if (mode == NULL)
       return;
 #ifndef CUSTOM_MODES_ONLY
    for (i=0;i<TOTAL_MODES;i++)
    {
       if (mode == static_mode_list[i])
       {
          return;
       }
    }
 #endif /* CUSTOM_MODES_ONLY */
    celt_free((celt_int16*)mode->eBands);
    celt_free((celt_int16*)mode->allocVectors);

    celt_free((celt_word16*)mode->window);
    celt_free((celt_int16*)mode->logN);

    celt_free((celt_int16*)mode->cache.index);
    celt_free((unsigned char*)mode->cache.bits);
    celt_free((unsigned char*)mode->cache.caps);
    clt_mdct_clear(&mode->mdct);

    celt_free((CELTMode *)mode);
 #endif
 }
	/* 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.

	- Neither the name of the Xiph.org Foundation nor the names of its
	contributors may be used to endorse or promote products derived from
	this software without specific prior written permission.

	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 FOUNDATION 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 celt_int16 eband5ms[] = {
	0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 34, 40, 48, 60, 78, 100
	};

	#if 0

	#define BITALLOC_SIZE 9
	/* 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,
	95, 90, 80, 75, 65, 60, 55, 50, 44, 40, 35, 30, 15, 1, 0, 0, 0, 0, 0, 0, 0,
	100, 95, 90, 88, 85, 82, 78, 74, 70, 65, 60, 54, 45, 35, 25, 15, 1, 0, 0, 0, 0,
	120,110,110,110,100, 96, 90, 88, 84, 76, 70, 65, 60, 45, 35, 25, 20, 1, 1, 0, 0,
	135,125,125,125,115,112,104,104,100, 96, 83, 78, 70, 55, 46, 36, 32, 28, 20, 8, 0,
	170,165,157,155,149,145,143,138,138,138,129,124,108, 96, 88, 83, 72, 56, 44, 28, 2,
	192,192,160,160,160,160,160,160,160,160,150,140,120,110,100, 90, 80, 70, 60, 50, 20,
	224,224,192,192,192,192,192,192,192,160,160,160,160,160,160,160,160,120, 80, 64, 40,
	255,255,224,224,224,224,224,224,224,192,192,192,192,192,192,192,192,192,192,192,120,
	};

	#else

	/* Alternate tuning (partially derived from Vorbis) */
	#define BITALLOC_SIZE 12
	/* 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,
	255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,251,251,239,204,129,104,
	};
	#endif

	#ifndef CUSTOM_MODES_ONLY
	#ifdef FIXED_POINT
	#include "static_modes_fixed.c"
	#else
	#include "static_modes_float.c"
	#endif
	#endif /* CUSTOM_MODES_ONLY */

	#ifndef M_PI
	#define M_PI 3.141592653
	#endif


	int celt_mode_info(const CELTMode mode, int request, celt_int32 value)
	{
	switch (request)
	{
	case CELT_GET_LOOKAHEAD:
	*value = mode->overlap;
	break;
	case CELT_GET_BITSTREAM_VERSION:
	*value = CELT_BITSTREAM_VERSION;
	break;
	case CELT_GET_SAMPLE_RATE:
	*value = mode->Fs;
	break;
	default:
	return CELT_UNIMPLEMENTED;
	}
	return CELT_OK;
	}

	#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 celt_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 celt_int16 compute_ebands(celt_int32 Fs, int frame_size, int res, int nbEBands)
	{
	celt_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*(celt_int32)frame_size)
	{
	*nbEBands = sizeof(eband5ms)/sizeof(eband5ms[0])-1;
	eBands = celt_alloc(sizeof(celt_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 = celt_alloc(sizeof(celt_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)/(2res)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)/(2res)*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]));
	}

	/for (i=0;i<=nbEBands+1;i++)
	printf ("%d ", eBands[i]);
	printf ("\n");
	exit(1);*/
	/* FIXME: Remove last band if too small */
	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 = celt_alloc(sizeof(unsigned char)(BITALLOC_SIZEmode->nbEBands));
	if (allocVectors==NULL)
	return;

	/* Check for standard mode */
	if (mode->Fs == 400*(celt_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(celt_int32)eband5ms[k] > mode->eBands[j](celt_int32)mode->Fs/mode->shortMdctSize)
	break;
	}
	if (k>mode->nbEBands-1)
	allocVectors[imode->nbEBands+j] = band_allocation[imaxBands + maxBands-1];
	else {
	celt_int32 a0, a1;
	a1 = mode->eBands[j](celt_int32)mode->Fs/mode->shortMdctSize - 400(celt_int32)eband5ms[k-1];
	a0 = 400(celt_int32)eband5ms[k] - mode->eBands[j](celt_int32)mode->Fs/mode->shortMdctSize;
	allocVectors[imode->nbEBands+j] = (a0band_allocation[i*maxBands+k-1]
	+ a1band_allocation[imaxBands+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 celt_mode_create(celt_int32 Fs, int frame_size, int error)
	{
	int i;
	int res;
	CELTMode *mode=NULL;
	celt_word16 *window;
	celt_int16 *logN;
	int LM;
	#ifdef STDIN_TUNING
	scanf("%d ", &MIN_BINS);
	scanf("%d ", &BITALLOC_SIZE);
	band_allocation = celt_alloc(sizeof(int)BARK_BANDSBITALLOC_SIZE);
	for (i=0;i<BARK_BANDS*BITALLOC_SIZE;i++)
	{
	scanf("%d ", band_allocation+i);
	}
	#endif
	ALLOC_STACK;
	#if !defined(VAR_ARRAYS) && !defined(USE_ALLOCA)
	if (global_stack==NULL)
	goto failure;
	#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 = CELT_OK;
	return (CELTMode*)static_mode_list[i];
	}
	}
	}
	#endif /* CUSTOM_MODES_ONLY */

	#ifndef CUSTOM_MODES
	if (error)
	*error = CELT_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 = CELT_BAD_ARG;
	return NULL;
	}
	if (frame_size < 40 \|\| frame_size > 1024 \|\| frame_size%2!=0)
	{
	if (error)
	*error = CELT_BAD_ARG;
	return NULL;
	}

	mode = celt_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);
	}

	if ((celt_int32)frame_size*75 >= Fs && (frame_size%16)==0)
	{
	LM = 3;
	} else if ((celt_int32)frame_size*150 >= Fs && (frame_size%8)==0)
	{
	LM = 2;
	} else if ((celt_int32)frame_size*300 >= Fs && (frame_size%4)==0)
	{
	LM = 1;
	} else
	{
	LM = 0;
	}

	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 = (celt_word16)celt_alloc(mode->overlapsizeof(celt_word16));
	if (window==NULL)
	goto failure;

	#ifndef FIXED_POINT
	for (i=0;i<mode->overlap;i++)
	window[i] = Q15ONEsin(.5M_PI* sin(.5M_PI(i+.5)/mode->overlap) * sin(.5M_PI(i+.5)/mode->overlap));
	#else
	for (i=0;i<mode->overlap;i++)
	window[i] = MIN32(32767,floor(.5+32768.sin(.5M_PI* sin(.5M_PI(i+.5)/mode->overlap) * sin(.5M_PI(i+.5)/mode->overlap))));
	#endif
	mode->window = window;

	logN = (celt_int16)celt_alloc(mode->nbEBandssizeof(celt_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);

	clt_mdct_init(&mode->mdct, 2mode->shortMdctSizemode->nbShortMdcts, mode->maxLM);
	if ((mode->mdct.trig==NULL)
	#ifndef ENABLE_TI_DSPLIB55
	\|\| (mode->mdct.kfft==NULL)
	#endif
	)
	goto failure;

	if (error)
	*error = CELT_OK;

	return mode;
	failure:
	if (error)
	*error = CELT_INVALID_MODE;
	if (mode!=NULL)
	celt_mode_destroy(mode);
	return NULL;
	#endif /* !CUSTOM_MODES */
	}

	void celt_mode_destroy(CELTMode *mode)
	{
	#ifdef CUSTOM_MODES
	int i;
	if (mode == NULL)
	return;
	#ifndef CUSTOM_MODES_ONLY
	for (i=0;i<TOTAL_MODES;i++)
	{
	if (mode == static_mode_list[i])
	{
	return;
	}
	}
	#endif /* CUSTOM_MODES_ONLY */
	celt_free((celt_int16*)mode->eBands);
	celt_free((celt_int16*)mode->allocVectors);

	celt_free((celt_word16*)mode->window);
	celt_free((celt_int16*)mode->logN);

	celt_free((celt_int16*)mode->cache.index);
	celt_free((unsigned char*)mode->cache.bits);
	celt_free((unsigned char*)mode->cache.caps);
	clt_mdct_clear(&mode->mdct);

	celt_free((CELTMode *)mode);
	#endif
	}