annotate decoders/mpglib/layer2.c @ 439:48b56888964d

Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 12 Jan 2003 21:12:19 +0000
parents ad4c8f34136a
children
rev   line source
261
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1 /*
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2 * Mpeg Layer-2 audio decoder
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3 * --------------------------
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4 * copyright (c) 1995 by Michael Hipp, All rights reserved. See also 'README'
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5 *
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6 */
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7
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8 #include "mpg123_sdlsound.h"
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9 #include "l2tables.h"
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10
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11 static int grp_3tab[32 * 3] = { 0, }; /* used: 27 */
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12 static int grp_5tab[128 * 3] = { 0, }; /* used: 125 */
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13 static int grp_9tab[1024 * 3] = { 0, }; /* used: 729 */
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14
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15 real muls[27][64]; /* also used by layer 1 */
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16
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17 void init_layer2(void)
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18 {
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19 static double mulmul[27] = {
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20 0.0 , -2.0/3.0 , 2.0/3.0 ,
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21 2.0/7.0 , 2.0/15.0 , 2.0/31.0, 2.0/63.0 , 2.0/127.0 , 2.0/255.0 ,
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22 2.0/511.0 , 2.0/1023.0 , 2.0/2047.0 , 2.0/4095.0 , 2.0/8191.0 ,
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23 2.0/16383.0 , 2.0/32767.0 , 2.0/65535.0 ,
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24 -4.0/5.0 , -2.0/5.0 , 2.0/5.0, 4.0/5.0 ,
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25 -8.0/9.0 , -4.0/9.0 , -2.0/9.0 , 2.0/9.0 , 4.0/9.0 , 8.0/9.0 };
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26 static int base[3][9] = {
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27 { 1 , 0, 2 , } ,
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28 { 17, 18, 0 , 19, 20 , } ,
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29 { 21, 1, 22, 23, 0, 24, 25, 2, 26 } };
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30 int i,j,k,l,len;
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31 real *table;
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32 static int tablen[3] = { 3 , 5 , 9 };
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33 static int *itable,*tables[3] = { grp_3tab , grp_5tab , grp_9tab };
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34
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35 for(i=0;i<3;i++)
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36 {
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37 itable = tables[i];
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38 len = tablen[i];
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39 for(j=0;j<len;j++)
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40 for(k=0;k<len;k++)
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41 for(l=0;l<len;l++)
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42 {
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43 *itable++ = base[i][l];
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44 *itable++ = base[i][k];
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45 *itable++ = base[i][j];
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46 }
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47 }
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48
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49 for(k=0;k<27;k++)
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50 {
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51 double m=mulmul[k];
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52 table = muls[k];
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53 for(j=3,i=0;i<63;i++,j--)
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54 *table++ = m * pow(2.0,(double) j / 3.0);
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55 *table++ = 0.0;
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56 }
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57 }
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58
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59
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60 void II_step_one(unsigned int *bit_alloc,int *scale,struct frame *fr)
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61 {
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62 int stereo = fr->stereo-1;
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63 int sblimit = fr->II_sblimit;
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64 int jsbound = fr->jsbound;
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65 int sblimit2 = fr->II_sblimit<<stereo;
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66 struct al_table *alloc1 = fr->alloc;
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67 int i;
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68 static unsigned int scfsi_buf[64];
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69 unsigned int *scfsi,*bita;
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70 int sc,step;
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71
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72 bita = bit_alloc;
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73 if(stereo)
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74 {
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75 for (i=jsbound;i;i--,alloc1+=(1<<step))
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76 {
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77 *bita++ = (char) getbits(step=alloc1->bits);
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78 *bita++ = (char) getbits(step);
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79 }
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80 for (i=sblimit-jsbound;i;i--,alloc1+=(1<<step))
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81 {
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82 bita[0] = (char) getbits(step=alloc1->bits);
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83 bita[1] = bita[0];
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84 bita+=2;
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85 }
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86 bita = bit_alloc;
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87 scfsi=scfsi_buf;
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88 for (i=sblimit2;i;i--)
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89 if (*bita++)
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90 *scfsi++ = (char) getbits_fast(2);
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91 }
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92 else /* mono */
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93 {
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94 for (i=sblimit;i;i--,alloc1+=(1<<step))
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95 *bita++ = (char) getbits(step=alloc1->bits);
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96 bita = bit_alloc;
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97 scfsi=scfsi_buf;
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98 for (i=sblimit;i;i--)
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99 if (*bita++)
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100 *scfsi++ = (char) getbits_fast(2);
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101 }
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102
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103 bita = bit_alloc;
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104 scfsi=scfsi_buf;
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105 for (i=sblimit2;i;i--)
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106 if (*bita++)
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107 switch (*scfsi++)
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108 {
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109 case 0:
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110 *scale++ = getbits_fast(6);
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111 *scale++ = getbits_fast(6);
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112 *scale++ = getbits_fast(6);
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113 break;
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114 case 1 :
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115 *scale++ = sc = getbits_fast(6);
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116 *scale++ = sc;
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117 *scale++ = getbits_fast(6);
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118 break;
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119 case 2:
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120 *scale++ = sc = getbits_fast(6);
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121 *scale++ = sc;
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122 *scale++ = sc;
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123 break;
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124 default: /* case 3 */
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125 *scale++ = getbits_fast(6);
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126 *scale++ = sc = getbits_fast(6);
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127 *scale++ = sc;
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128 break;
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129 }
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130
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131 }
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132
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133 void II_step_two(unsigned int *bit_alloc,real fraction[2][4][SBLIMIT],int *scale,struct frame *fr,int x1)
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134 {
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135 int i,j,k,ba;
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136 int stereo = fr->stereo;
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137 int sblimit = fr->II_sblimit;
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138 int jsbound = fr->jsbound;
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139 struct al_table *alloc2,*alloc1 = fr->alloc;
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140 unsigned int *bita=bit_alloc;
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141 int d1,step;
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142
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143 for (i=0;i<jsbound;i++,alloc1+=(1<<step))
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144 {
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145 step = alloc1->bits;
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146 for (j=0;j<stereo;j++)
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147 {
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148 if ( (ba=*bita++) )
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149 {
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150 k=(alloc2 = alloc1+ba)->bits;
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151 if( (d1=alloc2->d) < 0)
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152 {
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153 real cm=muls[k][scale[x1]];
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154 fraction[j][0][i] = ((real) ((int)getbits(k) + d1)) * cm;
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155 fraction[j][1][i] = ((real) ((int)getbits(k) + d1)) * cm;
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156 fraction[j][2][i] = ((real) ((int)getbits(k) + d1)) * cm;
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157 }
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158 else
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159 {
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160 static int *table[] = { 0,0,0,grp_3tab,0,grp_5tab,0,0,0,grp_9tab };
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
161 unsigned int idx,*tab,m=scale[x1];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
162 idx = (unsigned int) getbits(k);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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163 tab = (unsigned int *) (table[d1] + idx + idx + idx);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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164 fraction[j][0][i] = muls[*tab++][m];
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Ryan C. Gordon <icculus@icculus.org>
parents:
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165 fraction[j][1][i] = muls[*tab++][m];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
166 fraction[j][2][i] = muls[*tab][m];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
167 }
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Ryan C. Gordon <icculus@icculus.org>
parents:
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168 scale+=3;
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Ryan C. Gordon <icculus@icculus.org>
parents:
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169 }
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170 else
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171 fraction[j][0][i] = fraction[j][1][i] = fraction[j][2][i] = 0.0;
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172 }
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Ryan C. Gordon <icculus@icculus.org>
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173 }
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
174
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
175 for (i=jsbound;i<sblimit;i++,alloc1+=(1<<step))
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Ryan C. Gordon <icculus@icculus.org>
parents:
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176 {
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Ryan C. Gordon <icculus@icculus.org>
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177 step = alloc1->bits;
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Ryan C. Gordon <icculus@icculus.org>
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178 bita++; /* channel 1 and channel 2 bitalloc are the same */
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Ryan C. Gordon <icculus@icculus.org>
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179 if ( (ba=*bita++) )
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Ryan C. Gordon <icculus@icculus.org>
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180 {
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Ryan C. Gordon <icculus@icculus.org>
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181 k=(alloc2 = alloc1+ba)->bits;
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Ryan C. Gordon <icculus@icculus.org>
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182 if( (d1=alloc2->d) < 0)
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Ryan C. Gordon <icculus@icculus.org>
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183 {
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Ryan C. Gordon <icculus@icculus.org>
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184 real cm;
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Ryan C. Gordon <icculus@icculus.org>
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185 cm=muls[k][scale[x1+3]];
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Ryan C. Gordon <icculus@icculus.org>
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186 fraction[1][0][i] = (fraction[0][0][i] = (real) ((int)getbits(k) + d1) ) * cm;
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187 fraction[1][1][i] = (fraction[0][1][i] = (real) ((int)getbits(k) + d1) ) * cm;
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Ryan C. Gordon <icculus@icculus.org>
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188 fraction[1][2][i] = (fraction[0][2][i] = (real) ((int)getbits(k) + d1) ) * cm;
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Ryan C. Gordon <icculus@icculus.org>
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189 cm=muls[k][scale[x1]];
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Ryan C. Gordon <icculus@icculus.org>
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190 fraction[0][0][i] *= cm; fraction[0][1][i] *= cm; fraction[0][2][i] *= cm;
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Ryan C. Gordon <icculus@icculus.org>
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191 }
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Ryan C. Gordon <icculus@icculus.org>
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192 else
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193 {
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Ryan C. Gordon <icculus@icculus.org>
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194 static int *table[] = { 0,0,0,grp_3tab,0,grp_5tab,0,0,0,grp_9tab };
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195 unsigned int idx,*tab,m1,m2;
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Ryan C. Gordon <icculus@icculus.org>
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196 m1 = scale[x1]; m2 = scale[x1+3];
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Ryan C. Gordon <icculus@icculus.org>
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197 idx = (unsigned int) getbits(k);
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Ryan C. Gordon <icculus@icculus.org>
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198 tab = (unsigned int *) (table[d1] + idx + idx + idx);
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199 fraction[0][0][i] = muls[*tab][m1]; fraction[1][0][i] = muls[*tab++][m2];
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200 fraction[0][1][i] = muls[*tab][m1]; fraction[1][1][i] = muls[*tab++][m2];
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Ryan C. Gordon <icculus@icculus.org>
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201 fraction[0][2][i] = muls[*tab][m1]; fraction[1][2][i] = muls[*tab][m2];
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202 }
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Ryan C. Gordon <icculus@icculus.org>
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203 scale+=6;
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Ryan C. Gordon <icculus@icculus.org>
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204 }
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Ryan C. Gordon <icculus@icculus.org>
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205 else {
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Ryan C. Gordon <icculus@icculus.org>
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206 fraction[0][0][i] = fraction[0][1][i] = fraction[0][2][i] =
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207 fraction[1][0][i] = fraction[1][1][i] = fraction[1][2][i] = 0.0;
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208 }
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Ryan C. Gordon <icculus@icculus.org>
parents:
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209 /*
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
210 should we use individual scalefac for channel 2 or
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Ryan C. Gordon <icculus@icculus.org>
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211 is the current way the right one , where we just copy channel 1 to
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Ryan C. Gordon <icculus@icculus.org>
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212 channel 2 ??
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Ryan C. Gordon <icculus@icculus.org>
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213 The current 'strange' thing is, that we throw away the scalefac
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Ryan C. Gordon <icculus@icculus.org>
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214 values for the second channel ...!!
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Ryan C. Gordon <icculus@icculus.org>
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215 -> changed .. now we use the scalefac values of channel one !!
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216 */
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217 }
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218
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Ryan C. Gordon <icculus@icculus.org>
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219 for(i=sblimit;i<SBLIMIT;i++)
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Ryan C. Gordon <icculus@icculus.org>
parents:
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220 for (j=0;j<stereo;j++)
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parents:
diff changeset
221 fraction[j][0][i] = fraction[j][1][i] = fraction[j][2][i] = 0.0;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222
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Ryan C. Gordon <icculus@icculus.org>
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223 }
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224
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225 static void II_select_table(struct frame *fr)
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Ryan C. Gordon <icculus@icculus.org>
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226 {
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227 static int translate[3][2][16] =
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228 { { { 0,2,2,2,2,2,2,0,0,0,1,1,1,1,1,0 } ,
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229 { 0,2,2,0,0,0,1,1,1,1,1,1,1,1,1,0 } } ,
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parents:
diff changeset
230 { { 0,2,2,2,2,2,2,0,0,0,0,0,0,0,0,0 } ,
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parents:
diff changeset
231 { 0,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0 } } ,
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 { { 0,3,3,3,3,3,3,0,0,0,1,1,1,1,1,0 } ,
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
233 { 0,3,3,0,0,0,1,1,1,1,1,1,1,1,1,0 } } };
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234
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diff changeset
235 int table,sblim;
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
236 static struct al_table *tables[5] =
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
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237 { alloc_0, alloc_1, alloc_2, alloc_3 , alloc_4 };
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Ryan C. Gordon <icculus@icculus.org>
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238 static int sblims[5] = { 27 , 30 , 8, 12 , 30 };
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
240 if(fr->lsf)
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
241 table = 4;
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Ryan C. Gordon <icculus@icculus.org>
parents:
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242 else
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 table = translate[fr->sampling_frequency][2-fr->stereo][fr->bitrate_index];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 sblim = sblims[table];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246 fr->alloc = tables[table];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247 fr->II_sblimit = sblim;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
248 }
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parents:
diff changeset
249
281
ad4c8f34136a Minor formatting updates.
Ryan C. Gordon <icculus@icculus.org>
parents: 279
diff changeset
250 int do_layer2(struct frame *fr,unsigned char *pcm_sample,
ad4c8f34136a Minor formatting updates.
Ryan C. Gordon <icculus@icculus.org>
parents: 279
diff changeset
251 int *pcm_point,struct mpstr *mp)
261
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parents:
diff changeset
252 {
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
253 int clip=0;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 int i,j;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 int stereo = fr->stereo;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 real fraction[2][4][SBLIMIT]; /* pick_table clears unused subbands */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257 unsigned int bit_alloc[64];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 int scale[192];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259 int single = fr->single;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261 II_select_table(fr);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262 fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 (fr->mode_ext<<2)+4 : fr->II_sblimit;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 if(stereo == 1 || single == 3)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266 single = 0;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 II_step_one(bit_alloc, scale, fr);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270 for (i=0;i<SCALE_BLOCK;i++)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271 {
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 II_step_two(bit_alloc,fraction,scale,fr,i>>2);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 for (j=0;j<3;j++) {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 if(single >= 0) {
279
52b9f37998db Removed global state variable; should be thread safe now.
Ryan C. Gordon <icculus@icculus.org>
parents: 261
diff changeset
275 clip += synth_1to1_mono(fraction[0][j],pcm_sample,pcm_point,mp);
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 }
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 else {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 int p1 = *pcm_point;
279
52b9f37998db Removed global state variable; should be thread safe now.
Ryan C. Gordon <icculus@icculus.org>
parents: 261
diff changeset
279 clip += synth_1to1(fraction[0][j],0,pcm_sample,&p1,mp);
52b9f37998db Removed global state variable; should be thread safe now.
Ryan C. Gordon <icculus@icculus.org>
parents: 261
diff changeset
280 clip += synth_1to1(fraction[1][j],1,pcm_sample,pcm_point,mp);
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
281 }
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 }
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284 }
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 return clip;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287 }
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289