nochmal c++ nach delphi

[Newbie44]

hallo dp fans,

ich muss was für jemanden schreiben und auch etwas vorhandenes irgendwie in delphi umsetzen hier ist der code den ich in delphi irgendwie formulieren muss:

Delphi-Quellcode:

void imdct_do_256(double data[], double delay[]);
void imdct_do_512(double data[], double delay[]);

typedef struct complex_s
{
   double real;
   double imag;
}   complex_t;

static uint_8 bit_reverse_512[128] = {
   0x00, 0x40, 0x20, 0x60, 0x10, 0x50, 0x30, 0x70, 
   0x08, 0x48, 0x28, 0x68, 0x18, 0x58, 0x38, 0x78, 
   0x04, 0x44, 0x24, 0x64, 0x14, 0x54, 0x34, 0x74, 
   0x0c, 0x4c, 0x2c, 0x6c, 0x1c, 0x5c, 0x3c, 0x7c, 
   0x02, 0x42, 0x22, 0x62, 0x12, 0x52, 0x32, 0x72, 
   0x0a, 0x4a, 0x2a, 0x6a, 0x1a, 0x5a, 0x3a, 0x7a, 
   0x06, 0x46, 0x26, 0x66, 0x16, 0x56, 0x36, 0x76, 
   0x0e, 0x4e, 0x2e, 0x6e, 0x1e, 0x5e, 0x3e, 0x7e, 
   0x01, 0x41, 0x21, 0x61, 0x11, 0x51, 0x31, 0x71, 
   0x09, 0x49, 0x29, 0x69, 0x19, 0x59, 0x39, 0x79, 
   0x05, 0x45, 0x25, 0x65, 0x15, 0x55, 0x35, 0x75, 
   0x0d, 0x4d, 0x2d, 0x6d, 0x1d, 0x5d, 0x3d, 0x7d, 
   0x03, 0x43, 0x23, 0x63, 0x13, 0x53, 0x33, 0x73, 
   0x0b, 0x4b, 0x2b, 0x6b, 0x1b, 0x5b, 0x3b, 0x7b, 
   0x07, 0x47, 0x27, 0x67, 0x17, 0x57, 0x37, 0x77, 
   0x0f, 0x4f, 0x2f, 0x6f, 0x1f, 0x5f, 0x3f, 0x7f};

static uint_8 bit_reverse_256[64] = {
   0x00, 0x20, 0x10, 0x30, 0x08, 0x28, 0x18, 0x38, 
   0x04, 0x24, 0x14, 0x34, 0x0c, 0x2c, 0x1c, 0x3c, 
   0x02, 0x22, 0x12, 0x32, 0x0a, 0x2a, 0x1a, 0x3a, 
   0x06, 0x26, 0x16, 0x36, 0x0e, 0x2e, 0x1e, 0x3e, 
   0x01, 0x21, 0x11, 0x31, 0x09, 0x29, 0x19, 0x39, 
   0x05, 0x25, 0x15, 0x35, 0x0d, 0x2d, 0x1d, 0x3d, 
   0x03, 0x23, 0x13, 0x33, 0x0b, 0x2b, 0x1b, 0x3b, 
   0x07, 0x27, 0x17, 0x37, 0x0f, 0x2f, 0x1f, 0x3f};

static complex_t buf[128];

/* Twiddle factor LUT */
static complex_t *w[7];
static complex_t w_1[1];
static complex_t w_2[2];
static complex_t w_4[4];
static complex_t w_8[8];
static complex_t w_16[16];
static complex_t w_32[32];
static complex_t w_64[64];

/* Twiddle factors for IMDCT */
static double xcos1[128];
static double xsin1[128];
static double xcos2[64];
static double xsin2[64];

/* Delay buffer for time domain interleaving */
static double delay[6][256];

/* Windowing function for Modified DCT */
static double window[] = {
   0.00014, 0.00024, 0.00037, 0.00051, 0.00067, 0.00086, 0.00107, 0.00130,
   0.00157, 0.00187, 0.00220, 0.00256, 0.00297, 0.00341, 0.00390, 0.00443,
   0.00501, 0.00564, 0.00632, 0.00706, 0.00785, 0.00871, 0.00962, 0.01061,
   0.01166, 0.01279, 0.01399, 0.01526, 0.01662, 0.01806, 0.01959, 0.02121,
   0.02292, 0.02472, 0.02662, 0.02863, 0.03073, 0.03294, 0.03527, 0.03770,
   0.04025, 0.04292, 0.04571, 0.04862, 0.05165, 0.05481, 0.05810, 0.06153,
   0.06508, 0.06878, 0.07261, 0.07658, 0.08069, 0.08495, 0.08935, 0.09389,
   0.09859, 0.10343, 0.10842, 0.11356, 0.11885, 0.12429, 0.12988, 0.13563,
   0.14152, 0.14757, 0.15376, 0.16011, 0.16661, 0.17325, 0.18005, 0.18699,
   0.19407, 0.20130, 0.20867, 0.21618, 0.22382, 0.23161, 0.23952, 0.24757,
   0.25574, 0.26404, 0.27246, 0.28100, 0.28965, 0.29841, 0.30729, 0.31626,
   0.32533, 0.33450, 0.34376, 0.35311, 0.36253, 0.37204, 0.38161, 0.39126,
   0.40096, 0.41072, 0.42054, 0.43040, 0.44030, 0.45023, 0.46020, 0.47019,
   0.48020, 0.49022, 0.50025, 0.51028, 0.52031, 0.53033, 0.54033, 0.55031,
   0.56026, 0.57019, 0.58007, 0.58991, 0.59970, 0.60944, 0.61912, 0.62873,
   0.63827, 0.64774, 0.65713, 0.66643, 0.67564, 0.68476, 0.69377, 0.70269,
   0.71150, 0.72019, 0.72877, 0.73723, 0.74557, 0.75378, 0.76186, 0.76981,
   0.77762, 0.78530, 0.79283, 0.80022, 0.80747, 0.81457, 0.82151, 0.82831,
   0.83496, 0.84145, 0.84779, 0.85398, 0.86001, 0.86588, 0.87160, 0.87716,
   0.88257, 0.88782, 0.89291, 0.89785, 0.90264, 0.90728, 0.91176, 0.91610,
   0.92028, 0.92432, 0.92822, 0.93197, 0.93558, 0.93906, 0.94240, 0.94560,
   0.94867, 0.95162, 0.95444, 0.95713, 0.95971, 0.96217, 0.96451, 0.96674,
   0.96887, 0.97089, 0.97281, 0.97463, 0.97635, 0.97799, 0.97953, 0.98099,
   0.98236, 0.98366, 0.98488, 0.98602, 0.98710, 0.98811, 0.98905, 0.98994,
   0.99076, 0.99153, 0.99225, 0.99291, 0.99353, 0.99411, 0.99464, 0.99513,
   0.99558, 0.99600, 0.99639, 0.99674, 0.99706, 0.99736, 0.99763, 0.99788,
   0.99811, 0.99831, 0.99850, 0.99867, 0.99882, 0.99895, 0.99908, 0.99919,
   0.99929, 0.99938, 0.99946, 0.99953, 0.99959, 0.99965, 0.99969, 0.99974,
   0.99978, 0.99981, 0.99984, 0.99986, 0.99988, 0.99990, 0.99992, 0.99993,
   0.99994, 0.99995, 0.99996, 0.99997, 0.99998, 0.99998, 0.99998, 0.99999,
   0.99999, 0.99999, 0.99999, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000,
   1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000 };

static complex_t cmplx_mult(complex_t a, complex_t b)
{
   complex_t ret;

   ret.real = a.real * b.real - a.imag * b.imag;
   ret.imag = a.real * b.imag + a.imag * b.real;

   return ret;
}

void imdct_init()
{
   int i, k;
   complex_t angle_step;
   complex_t current_angle;

   /* Twiddle factors to turn IFFT into IMDCT */
   for(i=0; i<128; i++)
   {
      xcos1[i] = cos(2.0 * M_PI * (8*i+1)/(8*N));
      xsin1[i] = sin(2.0 * M_PI * (8*i+1)/(8*N));
   }
   
   /* More twiddle factors to turn IFFT into IMDCT */
   for(i=0; i<64; i++)
   {
      xcos2[i] = cos(2.0 * M_PI * (8*i+1)/(4*N));
      xsin2[i] = sin(2.0 * M_PI * (8*i+1)/(4*N));
   }

   /* Canonical twiddle factors for FFT */
   w[0] = w_1;
   w[1] = w_2;
   w[2] = w_4;
   w[3] = w_8;
   w[4] = w_16;
   w[5] = w_32;
   w[6] = w_64;

   for( i = 0; i < 7; i++)
   {
      angle_step.real = cos(-2.0 * M_PI / (1 << (i+1)));
      angle_step.imag = sin(-2.0 * M_PI / (1 << (i+1)));

      current_angle.real = 1.0;
      current_angle.imag = 0.0;

      for (k = 0; k < 1 << i; k++)
      {
         w[i][k] = current_angle;
         current_angle = cmplx_mult(current_angle, angle_step);
      }
   }

   ZeroMemory(&delay, sizeof(delay));
}

void imdct_do_512(double data[], double delay[])
{
   int i, k;
   int p, q;
   int m;
   int two_m;
   int two_m_plus_one;

   double tmp_a_i, tmp_a_r, tmp_b_i, tmp_b_r;
   double *data_ptr, *delay_ptr, *window_ptr;

   // Pre IFFT complex multiply plus IFFT cmplx conjugate and bit reverse permutation
   for(i=0; i < 128; i++)
   {
      k = bit_reverse_512[i];

      /* z[i] = (X[256-2*i-1] + j * X[2*i]) * (xcos1[i] + j * xsin1[i]) ; */ 
      buf[k].real = data[255 - (i<<1)] * xcos1[i] - data[i<<1] * xsin1[i];
       buf[k].imag = - data[i<<1] * xcos1[i] - data[255 - (i<<1)] * xsin1[i];
   }

   // FFT Merge 
   for (m=0; m<7; m++)
   {
      if (m)
         two_m = 1<<m;
      else
         two_m = 1;

      two_m_plus_one = 1<<(m+1);

      for(k=0; k<two_m; k++)
      {
         for(i=0; i<128; i+=two_m_plus_one)
         {
            p = k + i;
            q = p + two_m;
            tmp_a_r = buf[p].real;
            tmp_a_i = buf[p].imag;
            tmp_b_r = buf[q].real * w[m][k].real - buf[q].imag * w[m][k].imag;
            tmp_b_i = buf[q].imag * w[m][k].real + buf[q].real * w[m][k].imag;
            buf[p].real = tmp_a_r + tmp_b_r;
            buf[p].imag = tmp_a_i + tmp_b_i;
            buf[q].real = tmp_a_r - tmp_b_r;
            buf[q].imag = tmp_a_i - tmp_b_i;

         }
      }
   }

   /* Post IFFT complex multiply  plus IFFT complex conjugate*/
   for(i=0; i<128; i++)
   {
      /* y[n] = z[n] * (xcos1[n] + j * xsin1[n]) ; */
      tmp_a_r = buf[i].real;
      tmp_a_i = buf[i].imag;

      // Note that I flipped the signs on the imaginary ops to do the complex conj
      buf[i].real = tmp_a_r * xcos1[i] + tmp_a_i * xsin1[i];
       buf[i].imag = tmp_a_r * xsin1[i] - tmp_a_i * xcos1[i];
   }
   
   data_ptr = data;
   delay_ptr = delay;
   window_ptr = window;

   /* Window and convert to real valued signal */
   for(i=0; i<64; i++) 
   { 
      *data_ptr++ = 2.0 * (-buf[64+i].imag * *window_ptr++ + *delay_ptr++); 
      *data_ptr++ = 2.0 * ( buf[63-i].real * *window_ptr++ + *delay_ptr++); 
   }

   for(i=0; i<64; i++) 
   { 
      *data_ptr++ = 2.0 * (-buf[i].real     * *window_ptr++ + *delay_ptr++); 
      *data_ptr++ = 2.0 * ( buf[127-i].imag * *window_ptr++ + *delay_ptr++); 
   }
   
   /* The trailing edge of the window goes into the delay line */
   delay_ptr = delay;

   for(i=0; i<64; i++) 
   { 
      *delay_ptr++ = -buf[64+i].real * *--window_ptr;      // 64 - 127
      *delay_ptr++ =  buf[63-i].imag * *--window_ptr;      // 63 - 0
   }

   for(i=0; i<64; i++) 
   {
      *delay_ptr++ =  buf[i].imag     * *--window_ptr;   // 0 - 63
      *delay_ptr++ = -buf[127-i].real * *--window_ptr;   // 127 - 64
   }
}

void imdct_do_256(double data[], double delay[])
{
   int i, k;
   int p, q;
   int m;
   int two_m;
   int two_m_plus_one;

   double tmp_a_i, tmp_a_r, tmp_b_i, tmp_b_r;
   double *data_ptr, *delay_ptr, *window_ptr;

   complex_t *buf_1, *buf_2;

   buf_1 = &buf[0];
   buf_2 = &buf[64];

   // Pre IFFT complex multiply plus IFFT cmplx conjugate and bit reverse
   // permutation
   for(i=0; i<64; i++) 
   { 
      /* X1[i] = X[2*i]  */
      /* X2[i] = X[2*i+1]     */

      k = bit_reverse_256[i];

      p = (127 - (i<<1))<<1;
      q = i<<2;

      /* Z1[i] = (X1[128-2*i-1] + j * X1[2*i]) * (xcos2[i] + j * xsin2[i]); */ 
      buf_1[k].real =   data[p] * xcos2[i] - data[q] * xsin2[i];
      buf_1[k].imag = - data[q] * xcos2[i] - data[p] * xsin2[i]; 
      /* Z2[i] = (X2[128-2*i-1] + j * X2[2*i]) * (xcos2[i] + j * xsin2[i]); */ 
      buf_2[k].real =   data[p + 1] * xcos2[i] - data[q + 1] * xsin2[i];
      buf_2[k].imag = - data[q + 1] * xcos2[i] - data[p + 1] * xsin2[i]; 
   }

   // FFT Merge 
   for (m=0; m<6; m++)
   {
      two_m = 1<<m;
      two_m_plus_one = 1<<(m+1);

      if(m)
         two_m = 1<<m;
      else
         two_m = 1;

      for(k=0; k<two_m; k++)
      {
         for(i=0; i<64; i+=two_m_plus_one)
         {
            p = k + i;
            q = p + two_m;
            // Do block 1
            tmp_a_r = buf_1[p].real;
            tmp_a_i = buf_1[p].imag;
            tmp_b_r = buf_1[q].real * w[m][k].real - buf_1[q].imag * w[m][k].imag;
            tmp_b_i = buf_1[q].imag * w[m][k].real + buf_1[q].real * w[m][k].imag;
            buf_1[p].real = tmp_a_r + tmp_b_r;
            buf_1[p].imag = tmp_a_i + tmp_b_i;
            buf_1[q].real = tmp_a_r - tmp_b_r;
            buf_1[q].imag = tmp_a_i - tmp_b_i;

            //Do block 2
            tmp_a_r = buf_2[p].real;
            tmp_a_i = buf_2[p].imag;
            tmp_b_r = buf_2[q].real * w[m][k].real - buf_2[q].imag * w[m][k].imag;
            tmp_b_i = buf_2[q].imag * w[m][k].real + buf_2[q].real * w[m][k].imag;
            buf_2[p].real = tmp_a_r + tmp_b_r;
            buf_2[p].imag = tmp_a_i + tmp_b_i;
            buf_2[q].real = tmp_a_r - tmp_b_r;
            buf_2[q].imag = tmp_a_i - tmp_b_i;

         }
      }
   }

   // Post IFFT complex multiply 
   for(i=0; i<64; i++)
   {
      // Note that I flipped the signs on the imaginary ops to do the complex conj

      /* y1[n] = z1[n] * (xcos2[n] + j * xsin2[n]) ; */ 
      tmp_a_r = buf_1[i].real;
      tmp_a_i = buf_1[i].imag;
      buf_1[i].real = tmp_a_r * xcos2[i] + tmp_a_i * xsin2[i];
      buf_1[i].imag = tmp_a_r * xsin2[i] - tmp_a_i * xcos2[i];

      /* y2[n] = z2[n] * (xcos2[n] + j * xsin2[n]) ; */ 
      tmp_a_r = buf_2[i].real;
      tmp_a_i = buf_2[i].imag;
      buf_2[i].real = tmp_a_r * xcos2[i] + tmp_a_i  * xsin2[i];
      buf_2[i].imag = tmp_a_r * xsin2[i] - tmp_a_i  * xcos2[i];
   }
   
   data_ptr = data;
   delay_ptr = delay;
   window_ptr = window;

   /* Window and convert to real valued signal */
   for(i=0; i<64; i++) 
   { 
      *data_ptr++ = 2.0 * (-buf_1[i].imag    * *window_ptr++ + *delay_ptr++);
      *data_ptr++ = 2.0 * ( buf_1[63-i].real * *window_ptr++ + *delay_ptr++);
   }

   for(i=0; i<64; i++) 
   {
      *data_ptr++ = 2.0 * (-buf_1[i].real    * *window_ptr++ + *delay_ptr++);
      *data_ptr++ = 2.0 * ( buf_1[63-i].imag * *window_ptr++ + *delay_ptr++);
   }
   
   delay_ptr = delay;

   for(i=0; i<64; i++) 
   {
      *delay_ptr++ = -buf_2[i].real    * *--window_ptr;
      *delay_ptr++ =  buf_2[63-i].imag * *--window_ptr;
   }

   for(i=0; i<64; i++) 
   {
      *delay_ptr++ =  buf_2[i].imag    * *--window_ptr;
      *delay_ptr++ = -buf_2[63-i].real * *--window_ptr;
   }
}

void imdct(bsi_t *bsi, audblk_t *audblk, stream_samples_t samples)
{
   int i;

   for(i=0; i<bsi->nfchans; i++)
   {
      if(audblk->blksw[i])
         imdct_do_256(samples[i], delay[i]);
      else
         imdct_do_512(samples[i], delay[i]);
   }

   if (bsi->lfeon)
      imdct_do_512(samples[5], delay[5]);
}

Hier die ac3.h die math.h ist ja bei c++ schon vorhanden

Delphi-Quellcode:

#include <windows.h>

typedef unsigned int   uint_32;
typedef unsigned short   uint_16;
typedef unsigned char   uint_8;

typedef signed int      sint_32;
typedef signed short   sint_16;
typedef signed char      sint_8;

uint_32 ac3_decode_data(uint_8 *data_start, uint_32 length, uint_32 start);

/* Exponent strategy constants */
#define EXP_REUSE   (0)
#define EXP_D15      (1)
#define EXP_D25      (2)
#define EXP_D45      (3)

/* Delta bit allocation constants */
#define DELTA_BIT_REUSE      (0)
#define DELTA_BIT_NEW      (1)
#define DELTA_BIT_NONE      (2)
#define DELTA_BIT_RESERVED   (3)

/* samples work structure */
typedef double stream_samples_t[6][256];

typedef struct syncinfo_s
{
   /* Sync word == 0x0B77 */
   uint_16 syncword; 
   /* crc for the first 5/8 of the sync block */
   /* uint_16   crc1; */
   /* Stream Sampling Rate (kHz) 0 = 48, 1 = 44.1, 2 = 32, 3 = reserved */
   uint_16   fscod;   
   /* Frame size code */
   uint_16   frmsizecod;

   /* Information not in the AC-3 bitstream, but derived */
   /* Frame size in 16 bit words */
   uint_16 frame_size;
   /* Bit rate in kilobits */
   uint_16 bit_rate;
   /* sampling rate in hertz */
   uint_32 sampling_rate;
}   syncinfo_t;

typedef struct bsi_s
{
   /* Bit stream identification == 0x8 */
   uint_16 bsid;   
   /* Bit stream mode */
   uint_16 bsmod;
   /* Audio coding mode */
   uint_16 acmod;
   /* If we're using the centre channel then */
      /* centre mix level */
      uint_16 cmixlev;
   /* If we're using the surround channel then */
      /* surround mix level */
      uint_16 surmixlev;
   /* If we're in 2/0 mode then */
      /* Dolby surround mix level - NOT USED - */
      uint_16 dsurmod;
   /* Low frequency effects on */
   uint_16 lfeon;
   /* Dialogue Normalization level */
   uint_16 dialnorm;
   /* Compression exists */
   uint_16 compre;
      /* Compression level */
      uint_16 compr;
   /* Language code exists */
   uint_16 langcode;
      /* Language code */
      uint_16 langcod;
   /* Audio production info exists*/
   uint_16 audprodie;
      uint_16 mixlevel;
      uint_16 roomtyp;
   /* If we're in dual mono mode (acmod == 0) then extra stuff */
      uint_16 dialnorm2;
      uint_16 compr2e;
         uint_16 compr2;
      uint_16 langcod2e;
         uint_16 langcod2;
      uint_16 audprodi2e;
         uint_16 mixlevel2;
         uint_16 roomtyp2;
   /* Copyright bit */
   uint_16 copyrightb;
   /* Original bit */
   uint_16 origbs;
   /* Timecode 1 exists */
   uint_16 timecod1e;
      /* Timecode 1 */
      uint_16 timecod1;
   /* Timecode 2 exists */
   uint_16 timecod2e;
      /* Timecode 2 */
      uint_16 timecod2;
   /* Additional bit stream info exists */
   uint_16 addbsie;
      /* Additional bit stream length - 1 (in bytes) */
      uint_16 addbsil;
      /* Additional bit stream information (max 64 bytes) */
      uint_8   addbsi[64];

   /* Information not in the AC-3 bitstream, but derived */
   /* Number of channels (excluding LFE)
    * Derived from acmod */
   uint_16 nfchans;
}   bsi_t;

/* more pain */
typedef struct audblk_s
{
   /* block switch bit indexed by channel num */
   uint_16 blksw[5];
   /* dither enable bit indexed by channel num */
   uint_16 dithflag[5];
   /* dynamic range gain exists */
   uint_16 dynrnge;
      /* dynamic range gain */
      uint_16 dynrng;
   /* if acmod==0 then */
   /* dynamic range 2 gain exists */
   uint_16 dynrng2e;
      /* dynamic range 2 gain */
      uint_16 dynrng2;
   /* coupling strategy exists */
   uint_16 cplstre;
      /* coupling in use */
      uint_16 cplinu;
         /* channel coupled */
         uint_16 chincpl[5];
         /* if acmod==2 then */
            /* Phase flags in use */
            uint_16 phsflginu;
         /* coupling begin frequency code */
         uint_16 cplbegf;
         /* coupling end frequency code */
         uint_16 cplendf;
         /* coupling band structure bits */
         uint_16 cplbndstrc[18];
         /* Do coupling co-ords exist for this channel? */
         uint_16 cplcoe[5];
         /* Master coupling co-ordinate */
         uint_16 mstrcplco[5];
         /* Per coupling band coupling co-ordinates */
         uint_16 cplcoexp[5][18];
         uint_16 cplcomant[5][18];
         /* Phase flags for dual mono */
         uint_16 phsflg[18];
   /* Is there a rematrixing strategy */
   uint_16 rematstr;
      /* Rematrixing bits */
      uint_16 rematflg[4];
   /* Coupling exponent strategy */
   uint_16 cplexpstr;
   /* Exponent strategy for full bandwidth channels */
   uint_16 chexpstr[5];
   /* Exponent strategy for lfe channel */
   uint_16 lfeexpstr;
   /* Channel bandwidth for independent channels */
   uint_16 chbwcod[5];
      /* The absolute coupling exponent */
      uint_16 cplabsexp;
      /* Coupling channel exponents (D15 mode gives 18 * 12 /3  encoded exponents */
      uint_16 cplexps[18 * 12 / 3];

   /* fbw channel exponents */
   uint_16 exps[5][252 / 3];
   /* channel gain range */
   uint_16 gainrng[5];
   /* low frequency exponents */
   uint_16 lfeexps[3];

   /* Bit allocation info */
   uint_16 baie;
      /* Slow decay code */
      uint_16 sdcycod;
      /* Fast decay code */
      uint_16 fdcycod;
      /* Slow gain code */
      uint_16 sgaincod;
      /* dB per bit code */
      uint_16 dbpbcod;
      /* masking floor code */
      uint_16 floorcod;

   /* SNR offset info */
   uint_16 snroffste;
      /* coarse SNR offset */
      uint_16 csnroffst;
      /* coupling fine SNR offset */
      uint_16 cplfsnroffst;
      /* coupling fast gain code */
      uint_16 cplfgaincod;
      /* fbw fine SNR offset */
      uint_16 fsnroffst[5];
      /* fbw fast gain code */
      uint_16 fgaincod[5];
      /* lfe fine SNR offset */
      uint_16 lfefsnroffst;
      /* lfe fast gain code */
      uint_16 lfefgaincod;
   
   /* Coupling leak info */
   uint_16 cplleake;
      /* coupling fast leak initialization */
      uint_16 cplfleak;
      /* coupling slow leak initialization */
      uint_16 cplsleak;
   
   /* delta bit allocation info */
   uint_16 deltbaie;
      /* coupling delta bit allocation exists */
      uint_16 cpldeltbae;
      /* fbw delta bit allocation exists */
      uint_16 deltbae[5];
      /* number of cpl delta bit segments */
      uint_16 cpldeltnseg;
         /* coupling delta bit allocation offset */
         uint_16 cpldeltoffst[8];
         /* coupling delta bit allocation length */
         uint_16 cpldeltlen[8];
         /* coupling delta bit allocation length */
         uint_16 cpldeltba[8];
      /* number of delta bit segments */
      uint_16 deltnseg[5];
         /* fbw delta bit allocation offset */
         uint_16 deltoffst[5][8];
         /* fbw delta bit allocation length */
         uint_16 deltlen[5][8];
         /* fbw delta bit allocation length */
         uint_16 deltba[5][8];

   /* skip length exists */
   uint_16 skiple;
      /* skip length */
      uint_16 skipl;

   //Removed Feb 2000 -ah
   /* channel mantissas */
   //sint_16 chmant[5][256];

   /* coupling mantissas */
   sint_16 cplmant[256];

   //Removed Feb 2000 -ah
   /* coupling mantissas */
   //sint_16 lfemant[7];

   /* Number of coupling sub-bands */
   uint_16 ncplsubnd;

   /* Number of combined coupling sub-bands
    * Derived from ncplsubnd and cplbndstrc */
   uint_16 ncplbnd;

   /* Number of exponent groups by channel
    * Derived from strmant, endmant */
   uint_16 nchgrps[5];

   /* Number of coupling exponent groups
    * Derived from cplbegf, cplendf, cplexpstr */
   uint_16 ncplgrps;
         
   /* End mantissa numbers of fbw channels */
   uint_16 endmant[5];

   /* Start and end mantissa numbers for the coupling channel */
   uint_16 cplstrtmant;
   uint_16 cplendmant;

   /* Decoded exponent info */
   uint_16 fbw_exp[5][256];
   uint_16 cpl_exp[256];
   uint_16 lfe_exp[7];

   /* Bit allocation pointer results */
   uint_16 fbw_bap[5][256];
   uint_16 cpl_bap[256];
   uint_16 lfe_bap[7];
}   audblk_t;

/* coeff */
void mantissa_init(void);
void coeff_unpack(bsi_t *bsi, audblk_t *audblk, stream_samples_t samples);

/* crc */
int crc_process_frame(uint_8 *data,uint_32 num_bytes);

/* downmix */
void drc_init(void);
void downmix(audblk_t *audblk, bsi_t* bsi, stream_samples_t stream_samples, sint_16 *s16_samples);

/* exponent */
#define UNPACK_FBW  1
#define UNPACK_CPL  2
#define UNPACK_LFE  4

void exponent_init(void);
void exponent_unpack( bsi_t *bsi, audblk_t *audblk);

/* imdct */
void imdct(bsi_t *bsi,audblk_t *audblk, stream_samples_t samples);
void imdct_init(void);

/* parse */
void parse_syncinfo(syncinfo_t *syncinfo,uint_8 *data);
void parse_audblk(bsi_t *bsi,audblk_t *audblk);
void parse_bsi(bsi_t *bsi);

/* rematrix */
void rematrix(audblk_t *audblk, stream_samples_t samples);

/* sanity check */
void sanity_check(bsi_t *bsi, audblk_t *audblk);

void InitialAC3(void);
unsigned char AC3Dec_Buffer[49152];      // 48KB/frame for 64~448 Kbps

uint_32 error_flag;

es ist sehr dringend ich bin jedoch leider damit etwas überfordert.

ich hoffe es gibt hier leute die mir helfen können

danke schon im vorraus

gruß

sebby

[NicoDE]

Das ist eine Menge Quellcode den Du da konvertiert haben willst.
Es wäre hilfreich, wenn Du schreibst, womit Du nicht zurecht kommst (der Rest ist stupide Tipparbeit).

[Newbie44]

DAs hauptproblem dabei ist für mich dieser absatz:

Delphi-Quellcode:

void imdct_init()
{
   int i, k;
   complex_t angle_step;
   complex_t current_angle;

   /* Twiddle factors to turn IFFT into IMDCT */
   for(i=0; i<128; i++)
   {
      xcos1[i] = cos(2.0 * M_PI * (8*i+1)/(8*N));
      xsin1[i] = sin(2.0 * M_PI * (8*i+1)/(8*N));
   }
   
   /* More twiddle factors to turn IFFT into IMDCT */
   for(i=0; i<64; i++)
   {
      xcos2[i] = cos(2.0 * M_PI * (8*i+1)/(4*N));
      xsin2[i] = sin(2.0 * M_PI * (8*i+1)/(4*N));
   }

   /* Canonical twiddle factors for FFT */
   w[0] = w_1;
   w[1] = w_2;
   w[2] = w_4;
   w[3] = w_8;
   w[4] = w_16;
   w[5] = w_32;
   w[6] = w_64;

   for( i = 0; i < 7; i++)
   {
      angle_step.real = cos(-2.0 * M_PI / (1 << (i+1)));
      angle_step.imag = sin(-2.0 * M_PI / (1 << (i+1)));

      current_angle.real = 1.0;
      current_angle.imag = 0.0;

      for (k = 0; k < 1 << i; k++)
      {
         w[i][k] = current_angle;
         current_angle = cmplx_mult(current_angle, angle_step);
      }
   }

   ZeroMemory(&delay, sizeof(delay));
}

void imdct_do_512(double data[], double delay[])
{
   int i, k;
   int p, q;
   int m;
   int two_m;
   int two_m_plus_one;

   double tmp_a_i, tmp_a_r, tmp_b_i, tmp_b_r;
   double *data_ptr, *delay_ptr, *window_ptr;

da steht so viel drinnen da blick ich nicht so richtig durch

[NicoDE]

Zitat von Newbie44:

DAs hauptproblem dabei ist für mich dieser absatz:

Code:

void imdct_init()
{
    int i, k;
    complex_t angle_step;
    complex_t current_angle;

    /* Twiddle factors to turn IFFT into IMDCT */
    for(i=0; i<128; i++)
    {
        //...

Delphi-Quellcode:

procedure imdct_init;
var
  i, k: Integer;
  angle_step: complex_t;
  current_angle: complex_t;
begin
  (* Twiddle factors to turn IFFT into IMDCT *)
  for i := 0 to 127 do
  begin
    //...

Der Rest ist selbsterklärend.

[sniper_w]

..und den selbserklärenden Rest zu bringen...

Delphi-Quellcode:

procedure imdct_init()
 var i,k : Integer;
     angle_step, current_angle: complex_t;
begin
   // Twiddle factors to turn IFFT into IMDCT */
   for i:=0 to 127 do
   begin
      xcos1[i] := cos(2.0 * M_PI * (8*i+1)/(8*N));
      xsin1[i] := sin(2.0 * M_PI * (8*i+1)/(8*N));
   end;

   // More twiddle factors to turn IFFT into IMDCT */
   for i:=0 to  63 do
   begin
      xcos2[i] := cos(2.0 * M_PI * (8*i+1)/(4*N));
      xsin2[i] := sin(2.0 * M_PI * (8*i+1)/(4*N));
   end;

   //* Canonical twiddle factors for FFT */
   w[0] := w_1;
   w[1] := w_2;
   w[2] := w_4;
   w[3] := w_8;
   w[4] := w_16;
   w[5] := w_32;
   w[6] := w_64;

   for i:=0 to 6 do
   begin
      angle_step.real := cos(-2.0 * M_PI / (1 shl (i+1)));
      angle_step.imag := sin(-2.0 * M_PI / (1 shl (i+1)));

      current_angle.real := 1.0;
      current_angle.imag := 0.0;

      k:=0;
      while(k<(1 shl i))do
      begin
        w[i,k] := current_angle;
        current_angle := cmplx_mult(current_angle, angle_step);
        Inc(k);
      end;
//      for (k = 0; k < 1 << i; k++)
//      {
//         w[i][k] = current_angle;
//         current_angle = cmplx_mult(current_angle, angle_step);
//      }
   end;

   ZeroMemory(@delay, sizeof(delay));
end;

procedure imdct_do_512(var data, delay:array of double);
  var i,k
      p,q,
      m,
      two_m,
      two_m_plus_one:Integer;
      tmp_a_i, tmp_a_r, tmp_b_i, tmp_b_r:double;
      data_ptr, delay_ptr, window_ptr : ^Double;;

begin

[Newbie44]

Danke für die antwort, aber ich hab noch ne stelle gefunden wo es sehr hakt nämlich diese hier:

Delphi-Quellcode:

for(i=0; i<64; i++) 
   { 
      /* X1[i] = X[2*i]  */
      /* X2[i] = X[2*i+1]     */

      k = bit_reverse_256[i];

      p = (127 - (i<<1))<<1;
      q = i<<2;

      /* Z1[i] = (X1[128-2*i-1] + j * X1[2*i]) * (xcos2[i] + j * xsin2[i]); */ 
      buf_1[k].real =   data[p] * xcos2[i] - data[q] * xsin2[i];
      buf_1[k].imag = - data[q] * xcos2[i] - data[p] * xsin2[i]; 
      /* Z2[i] = (X2[128-2*i-1] + j * X2[2*i]) * (xcos2[i] + j * xsin2[i]); */ 
      buf_2[k].real =   data[p + 1] * xcos2[i] - data[q + 1] * xsin2[i];
      buf_2[k].imag = - data[q + 1] * xcos2[i] - data[p + 1] * xsin2[i]; 
   }

ich komme mit dem vielen sinus und kosinus durcheinander und erkenne teilweise nicht so recht den sinn der formel

[sniper_w]

Delphi-Quellcode:

for i:=0 to 63 do
begin
//      /* X1[i] = X[2*i]  */
//      /* X2[i] = X[2*i+1]     */

      k := bit_reverse_256[i];

      p := (127 - (i shl 1)) shl 1;
      q := i shl 2;

//      /* Z1[i] = (X1[128-2*i-1] + j * X1[2*i]) * (xcos2[i] + j * xsin2[i]); */
      buf_1[k].real :=   data[p] * xcos2[i] - data[q] * xsin2[i];
      buf_1[k].imag := - data[q] * xcos2[i] - data[p] * xsin2[i];
//      /* Z2[i] = (X2[128-2*i-1] + j * X2[2*i]) * (xcos2[i] + j * xsin2[i]); */
      buf_2[k].real :=   data[p + 1] * xcos2[i] - data[q + 1] * xsin2[i];
      buf_2[k].imag := - data[q + 1] * xcos2[i] - data[p + 1] * xsin2[i];
end;

[Newbie44]

DAnke für die schnelle Hilfe nun kann ich weitermachen