1 | //convert.c: |
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2 | |
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3 | #include "libroar.h" |
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4 | |
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5 | int roar_conv_bits (void * out, void * in, int samples, int from, int to) { |
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6 | if ( from == to ) { |
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7 | if ( in == out ) |
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8 | return 0; |
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9 | |
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10 | memcpy(out, in, samples * from / 8); |
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11 | return 0; |
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12 | } |
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13 | |
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14 | if ( from == 8 && to == 16 ) |
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15 | return roar_conv_bits_8to16(out, in, samples); |
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16 | |
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17 | if ( from == 16 && to == 8 ) |
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18 | return roar_conv_bits_16to8(out, in, samples); |
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19 | |
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20 | return -1; |
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21 | } |
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22 | |
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23 | int roar_conv_bits_8to16 (void * out, void * in, int samples) { |
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24 | char * ip = (char *)in; |
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25 | int16_t * op = (int16_t*)out; |
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26 | int i; |
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27 | |
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28 | for (i = samples - 1; i >= 0; i--) |
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29 | op[i] = ip[i] << 8; |
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30 | |
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31 | return 0; |
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32 | } |
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33 | |
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34 | int roar_conv_bits_16to8 (void * out, void * in, int samples) { |
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35 | int16_t * ip = (int16_t*)in; |
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36 | char * op = (char *)out; |
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37 | int i; |
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38 | |
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39 | for (i = 0; i < samples; i++) |
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40 | op[i] = ip[i] >> 8; |
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41 | |
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42 | return 0; |
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43 | } |
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44 | |
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45 | |
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46 | int roar_conv_chans (void * out, void * in, int samples, int from, int to, int bits) { |
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47 | if ( from == 1 ) { |
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48 | if ( bits == 8 ) { |
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49 | return roar_conv_chans_1ton8(out, in, samples, to); |
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50 | } else if ( bits == 16 ) { |
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51 | return roar_conv_chans_1ton16(out, in, samples, to); |
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52 | } else { |
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53 | return -1; |
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54 | } |
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55 | } |
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56 | |
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57 | return -1; |
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58 | } |
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59 | |
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60 | int roar_conv_chans_1ton8 (void * out, void * in, int samples, int to) { |
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61 | char * ip = (char*) in, * op = (char*) out; |
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62 | int i; |
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63 | int c; |
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64 | |
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65 | for (i = samples - 1; i >= 0; i--) |
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66 | for (c = to - 1; c >= 0; c--) |
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67 | op[i*to + c] = ip[i]; |
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68 | |
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69 | return 0; |
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70 | } |
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71 | |
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72 | int roar_conv_chans_1ton16 (void * out, void * in, int samples, int to) { |
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73 | int16_t * ip = (int16_t*) in, * op = (int16_t*) out; |
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74 | int i; |
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75 | int c; |
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76 | |
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77 | for (i = samples - 1; i >= 0; i--) |
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78 | for (c = to - 1; c >= 0; c--) |
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79 | op[i*to + c] = ip[i]; |
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80 | |
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81 | return 0; |
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82 | } |
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83 | |
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84 | int roar_conv_rate (void * out, void * in, int samples, int from, int to, int bits, int channels) { |
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85 | if ( bits == 8 ) |
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86 | return roar_conv_rate_8(out, in, samples, from, to, channels); |
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87 | |
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88 | if ( bits == 16 ) |
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89 | return roar_conv_rate_16(out, in, samples, from, to, channels); |
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90 | |
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91 | return -1; |
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92 | } |
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93 | |
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94 | int roar_conv_rate_8 (void * out, void * in, int samples, int from, int to, int channels) { |
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95 | return -1; |
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96 | } |
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97 | |
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98 | int roar_conv_rate_16 (void * out, void * in, int samples, int from, int to, int channels) { |
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99 | int16_t * ip = (int16_t*) in, * op = (int16_t*) out; |
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100 | int i, j; |
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101 | int max; |
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102 | int teiler = -1; |
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103 | |
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104 | |
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105 | if ( from > to ) { |
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106 | return -1; |
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107 | } else { |
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108 | for (i = 8; i > 0; i--) { |
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109 | if ( from * i == to ) { |
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110 | teiler = i; |
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111 | break; |
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112 | } |
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113 | } |
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114 | |
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115 | if ( teiler == -1 ) |
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116 | return -1; |
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117 | |
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118 | if ( channels == 2 ) { |
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119 | max = (samples-1)/(2*teiler); |
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120 | |
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121 | for (i = 0; i < max; i++) { |
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122 | for (j = 0; j < teiler; j++) { |
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123 | op[teiler*i*2 + j] = ip[i]; |
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124 | op[teiler*i*2 + 2 + j] = ip[i+1]; |
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125 | } |
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126 | } |
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127 | |
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128 | } else if ( channels == 1 ) { |
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129 | max = (samples-1)/teiler; |
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130 | |
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131 | for (i = 0; i < max; i++) { |
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132 | for (j = 0; j < teiler; j++) { |
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133 | op[teiler*i + j] = ip[i]; |
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134 | } |
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135 | } |
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136 | |
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137 | } else { |
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138 | return -1; |
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139 | max = (samples-1)/teiler; |
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140 | |
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141 | for (i = 0; i < max; i++) { |
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142 | for (j = 0; j < teiler; j++) { |
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143 | // printf("op[teiler*i + j = %i] = ip[i=%i]; // samples=%i, teiler=%i, channels=%i\n", |
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144 | // teiler*i + j, i + ((i+j) % channels), samples, teiler, channels); |
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145 | op[teiler*i + j] = ip[i + ((i+j) % channels)]; |
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146 | } |
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147 | } |
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148 | } |
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149 | |
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150 | return 0; |
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151 | } |
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152 | |
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153 | return -1; |
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154 | } |
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155 | |
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156 | int raor_conv_codec (void * out, void * in, int samples, int from, int to, int bits) { |
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157 | int inbo = ROAR_CODEC_BYTE_ORDER(from), outbo = ROAR_CODEC_BYTE_ORDER(to); |
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158 | int ins = ROAR_CODEC_IS_SIGNED(from), outs = ROAR_CODEC_IS_SIGNED(to); |
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159 | |
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160 | if ( inbo != outbo ) |
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161 | return -1; |
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162 | |
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163 | if ( ins != outs ) { |
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164 | if ( ins && !outs ) { |
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165 | if ( bits == 8 ) { |
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166 | roar_conv_codec_s2u8(out, in, samples); |
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167 | } else { |
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168 | return -1; |
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169 | } |
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170 | } else { |
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171 | return -1; |
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172 | } |
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173 | } |
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174 | |
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175 | return 0; |
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176 | } |
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177 | |
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178 | int roar_conv_codec_s2u8 (void * out, void * in, int samples) { |
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179 | char * ip = in; |
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180 | unsigned char * op = out; |
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181 | int i; |
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182 | |
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183 | for(i = 0; i < samples; i++) |
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184 | op[i] = ip[i] + 128; |
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185 | |
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186 | return 0; |
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187 | } |
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188 | |
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189 | |
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190 | int roar_conv (void * out, void * in, int samples, struct roar_audio_info * from, struct roar_audio_info * to) { |
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191 | void * ip = in; |
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192 | |
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193 | // TODO: decide how to work around both in and out beeing to small to hold all |
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194 | // data between the steps. |
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195 | // for the moment: guess out >= in |
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196 | |
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197 | if ( from->bits != to->bits ) { |
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198 | if ( roar_conv_bits(out, ip, samples, from->bits, to->bits) == -1 ) |
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199 | return -1; |
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200 | else |
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201 | ip = out; |
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202 | } |
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203 | |
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204 | if ( from->channels != to->channels ) { |
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205 | if ( roar_conv_chans(out, ip, samples, from->channels, to->channels, to->bits) == -1 ) |
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206 | return -1; |
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207 | else |
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208 | ip = out; |
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209 | } |
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210 | |
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211 | if ( from->rate != to->rate ) { |
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212 | if ( roar_conv_rate(out, ip, samples, from->rate, to->rate, to->bits, to->channels) == -1 ) |
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213 | return -1; |
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214 | else |
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215 | ip = out; |
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216 | } |
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217 | |
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218 | if ( from->codec != to->codec ) |
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219 | return -1; |
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220 | |
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221 | return 0; |
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222 | } |
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223 | |
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224 | //ll |
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