1 | /*
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2 | * Real Audio 1.0 (14.4K)
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3 | * Copyright (c) 2003 the ffmpeg project
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4 | *
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5 | * This library is free software; you can redistribute it and/or
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6 | * modify it under the terms of the GNU Lesser General Public
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7 | * License as published by the Free Software Foundation; either
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8 | * version 2 of the License, or (at your option) any later version.
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9 | *
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10 | * This library is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 | * Lesser General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU Lesser General Public
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16 | * License along with this library; if not, write to the Free Software
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17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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18 | */
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19 |
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20 | #include "avcodec.h"
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21 | #include "ra144.h"
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22 |
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23 | #define DATABLOCK1 20 /* size of 14.4 input block in bytes */
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24 | #define DATACHUNK1 1440 /* size of 14.4 input chunk in bytes */
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25 | #define AUDIOBLOCK 160 /* size of output block in 16-bit words (320 bytes) */
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26 | #define AUDIOBUFFER 12288 /* size of output buffer in 16-bit words (24576 bytes) */
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27 | /* consts */
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28 | #define NBLOCKS 4 /* number of segments within a block */
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29 | #define BLOCKSIZE 40 /* (quarter) block size in 16-bit words (80 bytes) */
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30 | #define HALFBLOCK 20 /* BLOCKSIZE/2 */
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31 | #define BUFFERSIZE 146 /* for do_output */
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32 |
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33 |
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34 | /* internal globals */
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35 | typedef struct {
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36 | unsigned int resetflag, val, oldval;
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37 | unsigned int unpacked[28]; /* buffer for unpacked input */
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38 | unsigned int *iptr; /* pointer to current input (from unpacked) */
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39 | unsigned int gval;
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40 | unsigned short *gsp;
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41 | unsigned int gbuf1[8];
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42 | unsigned short gbuf2[120];
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43 | signed short output_buffer[40];
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44 | unsigned int *decptr; /* decoder ptr */
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45 | signed short *decsp;
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46 |
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47 | /* the swapped buffers */
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48 | unsigned int swapb1a[10];
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49 | unsigned int swapb2a[10];
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50 | unsigned int swapb1b[10];
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51 | unsigned int swapb2b[10];
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52 | unsigned int *swapbuf1;
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53 | unsigned int *swapbuf2;
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54 | unsigned int *swapbuf1alt;
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55 | unsigned int *swapbuf2alt;
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56 |
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57 | unsigned int buffer[5];
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58 | unsigned short int buffer_2[148];
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59 | unsigned short int buffer_a[40];
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60 | unsigned short int buffer_b[40];
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61 | unsigned short int buffer_c[40];
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62 | unsigned short int buffer_d[40];
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63 |
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64 | unsigned short int work[50];
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65 | unsigned short *sptr;
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66 |
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67 | int buffer1[10];
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68 | int buffer2[10];
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69 |
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70 | signed short wavtable1[2304];
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71 | unsigned short wavtable2[2304];
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72 | } Real144_internal;
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73 |
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74 | static int ra144_decode_init(AVCodecContext * avctx)
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75 | {
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76 | Real144_internal *glob=avctx->priv_data;
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77 |
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78 | memset(glob,0,sizeof(Real144_internal));
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79 | glob->resetflag=1;
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80 | glob->swapbuf1=glob->swapb1a;
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81 | glob->swapbuf2=glob->swapb2a;
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82 | glob->swapbuf1alt=glob->swapb1b;
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83 | glob->swapbuf2alt=glob->swapb2b;
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84 |
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85 | memcpy(glob->wavtable1,wavtable1,sizeof(wavtable1));
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86 | memcpy(glob->wavtable2,wavtable2,sizeof(wavtable2));
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87 |
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88 | return 0;
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89 | }
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90 |
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91 | static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len);
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92 | static void add_wav(Real144_internal *glob, int n, int f, int m1, int m2, int m3, short *s1, short *s2, short *s3, short *dest);
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93 | static int irms(short *data, int factor);
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94 | static void rotate_block(short *source, short *target, int offset);
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95 | /* lookup square roots in table */
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96 | static int t_sqrt(unsigned int x)
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97 | {
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98 | int s=0;
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99 | while (x>0xfff) { s++; x=x>>2; }
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100 | return (sqrt_table[x]<<s)<<2;
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101 | }
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102 |
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103 | /* do 'voice' */
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104 | static void do_voice(int *a1, int *a2)
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105 | {
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106 | int buffer[10];
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107 | int *b1,*b2;
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108 | int x,y;
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109 | int *ptr,*tmp;
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110 |
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111 | b1=buffer;
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112 | b2=a2;
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113 |
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114 | for (x=0;x<10;x++) {
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115 | b1[x]=(*a1)<<4;
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116 |
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117 | if(x>0) {
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118 | ptr=b2+x;
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119 | for (y=0;y<=x-1;y++)
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120 | b1[y]=(((*a1)*(*(--ptr)))>>12)+b2[y];
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121 | }
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122 | tmp=b1;
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123 | b1=b2;
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124 | b2=tmp;
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125 | a1++;
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126 | }
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127 | ptr=a2+10;
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128 | while (ptr>a2) (*a2++)>>=4;
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129 | }
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130 |
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131 |
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132 | /* do quarter-block output */
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133 | static void do_output_subblock(Real144_internal *glob, unsigned int x)
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134 | {
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135 | int a,b,c,d,e,f,g;
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136 |
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137 | if (x==1) memset(glob->buffer,0,20);
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138 | if ((*glob->iptr)==0) a=0;
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139 | else a=(*glob->iptr)+HALFBLOCK-1;
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140 | glob->iptr++;
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141 | b=*(glob->iptr++);
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142 | c=*(glob->iptr++);
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143 | d=*(glob->iptr++);
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144 | if (a) rotate_block(glob->buffer_2,glob->buffer_a,a);
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145 | memcpy(glob->buffer_b,etable1+b*BLOCKSIZE,BLOCKSIZE*2);
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146 | e=((ftable1[b]>>4)*glob->gval)>>8;
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147 | memcpy(glob->buffer_c,etable2+c*BLOCKSIZE,BLOCKSIZE*2);
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148 | f=((ftable2[c]>>4)*glob->gval)>>8;
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149 | if (a) g=irms(glob->buffer_a,glob->gval)>>12;
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150 | else g=0;
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151 | add_wav(glob,d,a,g,e,f,glob->buffer_a,glob->buffer_b,glob->buffer_c,glob->buffer_d);
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152 | memmove(glob->buffer_2,glob->buffer_2+BLOCKSIZE,(BUFFERSIZE-BLOCKSIZE)*2);
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153 | memcpy(glob->buffer_2+BUFFERSIZE-BLOCKSIZE,glob->buffer_d,BLOCKSIZE*2);
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154 | final(glob,glob->gsp,glob->buffer_d,glob->output_buffer,glob->buffer,BLOCKSIZE);
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155 | }
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156 |
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157 | /* rotate block */
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158 | static void rotate_block(short *source, short *target, int offset)
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159 | {
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160 | short *end;
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161 | short *ptr1;
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162 | short *ptr2;
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163 | short *ptr3;
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164 | ptr2=source+BUFFERSIZE;
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165 | ptr3=ptr1=ptr2-offset;
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166 | end=target+BLOCKSIZE;
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167 | while (target<end) {
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168 | *(target++)=*(ptr3++);
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169 | if (ptr3==ptr2) ptr3=ptr1;
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170 | }
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171 | }
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172 |
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173 | /* inverse root mean square */
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174 | static int irms(short *data, int factor)
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175 | {
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176 | short *p1,*p2;
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177 | unsigned int sum;
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178 | p2=(p1=data)+BLOCKSIZE;
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179 | for (sum=0;p2>p1;p1++) sum+=(*p1)*(*p1);
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180 | if (sum==0) return 0; /* OOPS - division by zero */
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181 | return (0x20000000/(t_sqrt(sum)>>8))*factor;
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182 | }
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183 |
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184 | /* multiply/add wavetable */
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185 | static void add_wav(Real144_internal *glob, int n, int f, int m1, int m2, int m3, short *s1, short *s2, short *s3, short *dest)
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186 | {
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187 | int a,b,c;
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188 | short *ptr,*ptr2;
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189 |
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190 | ptr=glob->wavtable1+n*9;
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191 | ptr2=glob->wavtable2+n*9;
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192 | if (f!=0) {
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193 | a=((*ptr)*m1)>>((*ptr2)+1);
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194 | } else {
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195 | a=0;
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196 | }
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197 | ptr++;ptr2++;
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198 | b=((*ptr)*m2)>>((*ptr2)+1);
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199 | ptr++;ptr2++;
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200 | c=((*ptr)*m3)>>((*ptr2)+1);
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201 | ptr2=(ptr=dest)+BLOCKSIZE;
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202 | if (f!=0)
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203 | while (ptr<ptr2)
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204 | *(ptr++)=((*(s1++))*a+(*(s2++))*b+(*(s3++))*c)>>12;
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205 | else
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206 | while (ptr<ptr2)
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207 | *(ptr++)=((*(s2++))*b+(*(s3++))*c)>>12;
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208 | }
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209 |
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210 |
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211 | static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len)
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212 | {
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213 | int x,sum;
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214 | int buffer[10];
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215 | short *ptr;
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216 | short *ptr2;
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217 |
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218 | memcpy(glob->work,statbuf,20);
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219 | memcpy(glob->work+10,i2,len*2);
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220 |
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221 | buffer[9]=i1[0];
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222 | buffer[8]=i1[1];
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223 | buffer[7]=i1[2];
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224 | buffer[6]=i1[3];
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225 | buffer[5]=i1[4];
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226 | buffer[4]=i1[5];
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227 | buffer[3]=i1[6];
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228 | buffer[2]=i1[7];
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229 | buffer[1]=i1[8];
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230 | buffer[0]=i1[9];
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231 |
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232 | ptr2=(ptr=glob->work)+len;
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233 | while (ptr<ptr2) {
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234 | for(sum=0,x=0;x<=9;x++)
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235 | sum+=buffer[x]*(ptr[x]);
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236 | sum=sum>>12;
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237 | x=ptr[10]-sum;
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238 | if (x<-32768 || x>32767)
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239 | {
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240 | memset(out,0,len*2);
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241 | memset(statbuf,0,20);
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242 | return;
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243 | }
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244 | ptr[10]=x;
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245 | ptr++;
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246 | }
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247 | memcpy(out,ptr+10-len,len*2);
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248 | memcpy(statbuf,ptr,20);
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249 | }
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250 |
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251 | /* Decode 20-byte input */
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252 | static void unpack_input(unsigned char *input, unsigned int *output)
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253 | {
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254 | unsigned int outbuffer[28];
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255 | unsigned short inbuffer[10];
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256 | unsigned int x;
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257 | unsigned int *ptr;
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258 |
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259 | /* fix endianness */
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260 | for (x=0;x<20;x+=2)
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261 | inbuffer[x/2]=(input[x]<<8)+input[x+1];
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262 |
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263 | /* unpack */
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264 | ptr=outbuffer;
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265 | *(ptr++)=27;
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266 | *(ptr++)=(inbuffer[0]>>10)&0x3f;
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267 | *(ptr++)=(inbuffer[0]>>5)&0x1f;
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268 | *(ptr++)=inbuffer[0]&0x1f;
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269 | *(ptr++)=(inbuffer[1]>>12)&0xf;
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270 | *(ptr++)=(inbuffer[1]>>8)&0xf;
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271 | *(ptr++)=(inbuffer[1]>>5)&7;
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272 | *(ptr++)=(inbuffer[1]>>2)&7;
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273 | *(ptr++)=((inbuffer[1]<<1)&6)|((inbuffer[2]>>15)&1);
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274 | *(ptr++)=(inbuffer[2]>>12)&7;
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275 | *(ptr++)=(inbuffer[2]>>10)&3;
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276 | *(ptr++)=(inbuffer[2]>>5)&0x1f;
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277 | *(ptr++)=((inbuffer[2]<<2)&0x7c)|((inbuffer[3]>>14)&3);
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278 | *(ptr++)=(inbuffer[3]>>6)&0xff;
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279 | *(ptr++)=((inbuffer[3]<<1)&0x7e)|((inbuffer[4]>>15)&1);
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280 | *(ptr++)=(inbuffer[4]>>8)&0x7f;
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281 | *(ptr++)=(inbuffer[4]>>1)&0x7f;
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282 | *(ptr++)=((inbuffer[4]<<7)&0x80)|((inbuffer[5]>>9)&0x7f);
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283 | *(ptr++)=(inbuffer[5]>>2)&0x7f;
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284 | *(ptr++)=((inbuffer[5]<<5)&0x60)|((inbuffer[6]>>11)&0x1f);
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285 | *(ptr++)=(inbuffer[6]>>4)&0x7f;
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286 | *(ptr++)=((inbuffer[6]<<4)&0xf0)|((inbuffer[7]>>12)&0xf);
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287 | *(ptr++)=(inbuffer[7]>>5)&0x7f;
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288 | *(ptr++)=((inbuffer[7]<<2)&0x7c)|((inbuffer[8]>>14)&3);
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289 | *(ptr++)=(inbuffer[8]>>7)&0x7f;
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290 | *(ptr++)=((inbuffer[8]<<1)&0xfe)|((inbuffer[9]>>15)&1);
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291 | *(ptr++)=(inbuffer[9]>>8)&0x7f;
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292 | *(ptr++)=(inbuffer[9]>>1)&0x7f;
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293 |
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294 | *(output++)=outbuffer[11];
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295 | for (x=1;x<11;*(output++)=outbuffer[x++]);
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296 | ptr=outbuffer+12;
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297 | for (x=0;x<16;x+=4)
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298 | {
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299 | *(output++)=ptr[x];
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300 | *(output++)=ptr[x+2];
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301 | *(output++)=ptr[x+3];
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302 | *(output++)=ptr[x+1];
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303 | }
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304 | }
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305 |
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306 | static unsigned int rms(int *data, int f)
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307 | {
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308 | int *c;
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309 | int x;
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310 | unsigned int res;
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311 | int b;
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312 |
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313 | c=data;
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314 | b=0;
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315 | res=0x10000;
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316 | for (x=0;x<10;x++)
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317 | {
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318 | res=(((0x1000000-(*c)*(*c))>>12)*res)>>12;
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319 | if (res==0) return 0;
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320 | if (res<=0x3fff)
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321 | {
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322 | while (res<=0x3fff)
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323 | {
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324 | b++;
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325 | res<<=2;
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326 | }
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327 | } else {
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328 | if (res>0x10000)
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329 | return 0; /* We're screwed, might as well go out with a bang. :P */
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330 | }
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331 | c++;
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332 | }
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333 | if (res>0) res=t_sqrt(res);
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334 |
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335 | res>>=(b+10);
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336 | res=(res*f)>>10;
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337 | return res;
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338 | }
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339 |
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340 | static void dec1(Real144_internal *glob, int *data, int *inp, int n, int f)
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341 | {
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342 | short *ptr,*end;
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343 |
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344 | *(glob->decptr++)=rms(data,f);
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345 | glob->decptr++;
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346 | end=(ptr=glob->decsp)+(n*10);
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347 | while (ptr<end) *(ptr++)=*(inp++);
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348 | }
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349 |
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350 | static int eq(Real144_internal *glob, short *in, int *target)
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351 | {
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352 | int retval;
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353 | int a;
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354 | int b;
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355 | int c;
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356 | unsigned int u;
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357 | short *sptr;
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358 | int *ptr1,*ptr2,*ptr3;
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359 | int *bp1,*bp2,*temp;
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360 |
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361 | retval=0;
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362 | bp1=glob->buffer1;
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363 | bp2=glob->buffer2;
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364 | ptr2=(ptr3=glob->buffer2)+9;
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365 | sptr=in;
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366 | while (ptr2>=ptr3)
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367 | *(ptr3++)=*(sptr++);
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368 |
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369 | target+=9;
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370 | a=bp2[9];
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371 | *target=a;
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372 | if (a+0x1000>0x1fff)
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373 | return 0; /* We're screwed, might as well go out with a bang. :P */
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374 | c=8;u=a;
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375 | while (c>=0)
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376 | {
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377 | if (u==0x1000) u++;
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378 | if (u==0xfffff000) u--;
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379 | b=0x1000-((u*u)>>12);
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380 | if (b==0) b++;
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381 | ptr2=bp1;
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382 | ptr1=(ptr3=bp2)+c;
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383 | for (u=0;u<=c;u++)
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384 | *(ptr2++)=((*(ptr3++)-(((*target)*(*(ptr1--)))>>12))*(0x1000000/b))>>12;
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385 | *(--target)=u=bp1[(c--)];
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386 | if ((u+0x1000)>0x1fff) retval=1;
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387 | temp=bp2;
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388 | bp2=bp1;
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389 | bp1=temp;
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390 | }
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391 | return retval;
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392 | }
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393 |
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394 | static void dec2(Real144_internal *glob, int *data, int *inp, int n, int f, int *inp2, int l)
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395 | {
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396 | unsigned int *ptr1,*ptr2;
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397 | int work[10];
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398 | int a,b;
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399 | int x;
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400 | int result;
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401 |
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402 | if(l+1<NBLOCKS/2) a=NBLOCKS-(l+1);
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403 | else a=l+1;
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404 | b=NBLOCKS-a;
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405 | if (l==0)
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406 | {
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407 | glob->decsp=glob->sptr=glob->gbuf2;
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408 | glob->decptr=glob->gbuf1;
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409 | }
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410 | ptr1=inp;
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411 | ptr2=inp2;
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412 | for (x=0;x<10*n;x++)
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413 | *(glob->sptr++)=(a*(*ptr1++)+b*(*ptr2++))>>2;
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414 | result=eq(glob,glob->decsp,work);
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415 | if (result==1)
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416 | {
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417 | dec1(glob,data,inp,n,f);
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418 | } else {
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419 | *(glob->decptr++)=rms(work,f);
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420 | glob->decptr++;
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421 | }
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422 | glob->decsp+=n*10;
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423 | }
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424 |
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425 | /* Uncompress one block (20 bytes -> 160*2 bytes) */
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426 | static int ra144_decode_frame(AVCodecContext * avctx,
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427 | void *vdata, int *data_size,
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428 | uint8_t * buf, int buf_size)
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429 | {
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430 | unsigned int a,b,c;
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431 | long s;
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432 | signed short *shptr;
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433 | unsigned int *lptr,*temp;
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434 | const short **dptr;
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435 | int16_t *datao;
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436 | int16_t *data = vdata;
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437 | Real144_internal *glob=avctx->priv_data;
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438 |
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439 | if(buf_size==0)
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440 | return 0;
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441 |
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442 | datao = data;
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443 | unpack_input(buf,glob->unpacked);
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444 |
|
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445 | glob->iptr=glob->unpacked;
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446 | glob->val=decodetable[0][(*(glob->iptr++))<<1];
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447 |
|
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448 | dptr=decodetable+1;
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449 | lptr=glob->swapbuf1;
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450 | while (lptr<glob->swapbuf1+10)
|
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451 | *(lptr++)=(*(dptr++))[(*(glob->iptr++))<<1];
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452 |
|
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453 | do_voice(glob->swapbuf1,glob->swapbuf2);
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454 |
|
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455 | a=t_sqrt(glob->val*glob->oldval)>>12;
|
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456 |
|
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457 | for (c=0;c<NBLOCKS;c++) {
|
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458 | if (c==(NBLOCKS-1)) {
|
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459 | dec1(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val);
|
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460 | } else {
|
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461 | if (c*2==(NBLOCKS-2)) {
|
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462 | if (glob->oldval<glob->val) {
|
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463 | dec2(glob,glob->swapbuf1,glob->swapbuf2,3,a,glob->swapbuf2alt,c);
|
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464 | } else {
|
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465 | dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,a,glob->swapbuf2,c);
|
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466 | }
|
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467 | } else {
|
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468 | if (c*2<(NBLOCKS-2)) {
|
---|
469 | dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,glob->oldval,glob->swapbuf2,c);
|
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470 | } else {
|
---|
471 | dec2(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val,glob->swapbuf2alt,c);
|
---|
472 | }
|
---|
473 | }
|
---|
474 | }
|
---|
475 | }
|
---|
476 |
|
---|
477 | /* do output */
|
---|
478 | for (b=0,c=0;c<4;c++) {
|
---|
479 | glob->gval=glob->gbuf1[c*2];
|
---|
480 | glob->gsp=glob->gbuf2+b;
|
---|
481 | do_output_subblock(glob,glob->resetflag);
|
---|
482 | glob->resetflag=0;
|
---|
483 |
|
---|
484 | shptr=glob->output_buffer;
|
---|
485 | while (shptr<glob->output_buffer+BLOCKSIZE) {
|
---|
486 | s=*(shptr++)<<2;
|
---|
487 | *data=s;
|
---|
488 | if (s>32767) *data=32767;
|
---|
489 | if (s<-32767) *data=-32768;
|
---|
490 | data++;
|
---|
491 | }
|
---|
492 | b+=30;
|
---|
493 | }
|
---|
494 |
|
---|
495 | glob->oldval=glob->val;
|
---|
496 | temp=glob->swapbuf1alt;
|
---|
497 | glob->swapbuf1alt=glob->swapbuf1;
|
---|
498 | glob->swapbuf1=temp;
|
---|
499 | temp=glob->swapbuf2alt;
|
---|
500 | glob->swapbuf2alt=glob->swapbuf2;
|
---|
501 | glob->swapbuf2=temp;
|
---|
502 | *data_size=(data-datao)*sizeof(*data);
|
---|
503 | return 20;
|
---|
504 | }
|
---|
505 |
|
---|
506 |
|
---|
507 | AVCodec ra_144_decoder =
|
---|
508 | {
|
---|
509 | "real_144",
|
---|
510 | CODEC_TYPE_AUDIO,
|
---|
511 | CODEC_ID_RA_144,
|
---|
512 | sizeof(Real144_internal),
|
---|
513 | ra144_decode_init,
|
---|
514 | NULL,
|
---|
515 | NULL,
|
---|
516 | ra144_decode_frame,
|
---|
517 | };
|
---|