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1905 | serge | 1 | /* |
2 | format:routines to deal with audio (output) format |
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3 | |||
4 | copyright 2008-9 by the mpg123 project - free software under the terms of the LGPL 2.1 |
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5 | see COPYING and AUTHORS files in distribution or http://mpg123.org |
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6 | initially written by Thomas Orgis, starting with parts of the old audio.c, with only faintly manage to show now |
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7 | */ |
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8 | |||
9 | #include "mpg123lib_intern.h" |
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10 | #include "debug.h" |
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11 | |||
12 | /* static int chans[NUM_CHANNELS] = { 1 , 2 }; */ |
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13 | static const long my_rates[MPG123_RATES] = /* only the standard rates */ |
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14 | { |
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15 | 8000, 11025, 12000, |
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16 | 16000, 22050, 24000, |
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17 | 32000, 44100, 48000, |
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18 | }; |
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19 | |||
20 | static const int my_encodings[MPG123_ENCODINGS] = |
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21 | { |
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22 | MPG123_ENC_SIGNED_16, |
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23 | MPG123_ENC_UNSIGNED_16, |
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24 | MPG123_ENC_SIGNED_32, |
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25 | MPG123_ENC_UNSIGNED_32, |
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26 | MPG123_ENC_FLOAT_32, |
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27 | MPG123_ENC_FLOAT_64, |
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28 | MPG123_ENC_SIGNED_8, |
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29 | MPG123_ENC_UNSIGNED_8, |
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30 | MPG123_ENC_ULAW_8, |
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31 | MPG123_ENC_ALAW_8 |
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32 | }; |
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33 | |||
34 | /* Only one type of float is supported. */ |
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35 | # ifdef REAL_IS_FLOAT |
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36 | # define MPG123_FLOAT_ENC MPG123_ENC_FLOAT_32 |
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37 | # else |
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38 | # define MPG123_FLOAT_ENC MPG123_ENC_FLOAT_64 |
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39 | # endif |
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40 | |||
41 | /* The list of actually possible encodings. */ |
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42 | static const int good_encodings[] = |
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43 | { |
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44 | #ifndef NO_16BIT |
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45 | MPG123_ENC_SIGNED_16, |
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46 | MPG123_ENC_UNSIGNED_16, |
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47 | #endif |
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48 | #ifndef NO_32BIT |
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49 | MPG123_ENC_SIGNED_32, |
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50 | MPG123_ENC_UNSIGNED_32, |
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51 | #endif |
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52 | #ifndef NO_REAL |
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53 | MPG123_FLOAT_ENC, |
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54 | #endif |
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55 | #ifndef NO_8BIT |
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56 | MPG123_ENC_SIGNED_8, |
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57 | MPG123_ENC_UNSIGNED_8, |
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58 | MPG123_ENC_ULAW_8, |
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59 | MPG123_ENC_ALAW_8 |
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60 | #endif |
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61 | }; |
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62 | |||
63 | /* Check if encoding is a valid one in this build. |
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64 | ...lazy programming: linear search. */ |
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65 | static int good_enc(const int enc) |
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66 | { |
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67 | size_t i; |
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68 | for(i=0; i |
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69 | if(enc == good_encodings[i]) return TRUE; |
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70 | |||
71 | return FALSE; |
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72 | } |
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73 | |||
74 | void attribute_align_arg mpg123_rates(const long **list, size_t *number) |
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75 | { |
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76 | if(list != NULL) *list = my_rates; |
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77 | if(number != NULL) *number = sizeof(my_rates)/sizeof(long); |
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78 | } |
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79 | |||
80 | /* Now that's a bit tricky... One build of the library knows only a subset of the encodings. */ |
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81 | void attribute_align_arg mpg123_encodings(const int **list, size_t *number) |
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82 | { |
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83 | if(list != NULL) *list = good_encodings; |
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84 | if(number != NULL) *number = sizeof(good_encodings)/sizeof(int); |
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85 | } |
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86 | |||
87 | /* char audio_caps[NUM_CHANNELS][MPG123_RATES+1][MPG123_ENCODINGS]; */ |
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88 | |||
89 | static int rate2num(mpg123_pars *mp, long r) |
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90 | { |
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91 | int i; |
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92 | for(i=0;i |
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93 | #ifndef NO_NTOM |
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94 | if(mp && mp->force_rate != 0 && mp->force_rate == r) return MPG123_RATES; |
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95 | #endif |
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96 | |||
97 | return -1; |
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98 | } |
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99 | |||
100 | static int enc2num(int encoding) |
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101 | { |
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102 | int i; |
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103 | for(i=0;i |
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104 | if(my_encodings[i] == encoding) return i; |
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105 | |||
106 | return -1; |
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107 | } |
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108 | |||
109 | static int cap_fit(mpg123_handle *fr, struct audioformat *nf, int f0, int f2) |
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110 | { |
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111 | int i; |
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112 | int c = nf->channels-1; |
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113 | int rn = rate2num(&fr->p, nf->rate); |
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114 | if(rn >= 0) for(i=f0;i |
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115 | { |
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116 | if(fr->p.audio_caps[c][rn][i]) |
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117 | { |
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118 | nf->encoding = my_encodings[i]; |
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119 | return 1; |
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120 | } |
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121 | } |
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122 | return 0; |
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123 | } |
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124 | |||
125 | static int freq_fit(mpg123_handle *fr, struct audioformat *nf, int f0, int f2) |
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126 | { |
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127 | nf->rate = frame_freq(fr)>>fr->p.down_sample; |
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128 | if(cap_fit(fr,nf,f0,f2)) return 1; |
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129 | nf->rate>>=1; |
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130 | if(cap_fit(fr,nf,f0,f2)) return 1; |
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131 | nf->rate>>=1; |
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132 | if(cap_fit(fr,nf,f0,f2)) return 1; |
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133 | #ifndef NO_NTOM |
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134 | /* If nothing worked, try the other rates, only without constrains from user. |
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135 | In case you didn't guess: We enable flexible resampling if we find a working rate. */ |
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136 | if(!fr->p.force_rate && fr->p.down_sample == 0) |
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137 | { |
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138 | int i; |
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139 | int c = nf->channels-1; |
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140 | int rn = rate2num(&fr->p, frame_freq(fr)); |
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141 | int rrn; |
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142 | if(rn < 0) return 0; |
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143 | /* Try higher rates first. */ |
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144 | for(i=f0;i |
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145 | if(fr->p.audio_caps[c][rrn][i]) |
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146 | { |
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147 | nf->rate = my_rates[rrn]; |
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148 | nf->encoding = my_encodings[i]; |
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149 | return 1; |
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150 | } |
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151 | /* Then lower rates. */ |
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152 | for(i=f0;i |
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153 | if(fr->p.audio_caps[c][rrn][i]) |
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154 | { |
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155 | nf->rate = my_rates[rrn]; |
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156 | nf->encoding = my_encodings[i]; |
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157 | return 1; |
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158 | } |
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159 | } |
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160 | #endif |
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161 | |||
162 | return 0; |
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163 | } |
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164 | |||
165 | /* match constraints against supported audio formats, store possible setup in frame |
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166 | return: -1: error; 0: no format change; 1: format change */ |
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167 | int frame_output_format(mpg123_handle *fr) |
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168 | { |
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169 | struct audioformat nf; |
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170 | int f0=0; |
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171 | int f2=MPG123_ENCODINGS; /* Omit the 32bit and float encodings. */ |
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172 | mpg123_pars *p = &fr->p; |
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173 | /* initialize new format, encoding comes later */ |
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174 | nf.channels = fr->stereo; |
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175 | |||
176 | /* All this forcing should be removed in favour of the capabilities table... */ |
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177 | if(p->flags & MPG123_FORCE_8BIT) |
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178 | { |
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179 | f0 = 6; |
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180 | f2 = 10; |
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181 | } |
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182 | if(p->flags & MPG123_FORCE_FLOAT) |
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183 | { |
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184 | f0 = 4; |
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185 | f2 = 6; |
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186 | } |
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187 | |||
188 | /* force stereo is stronger */ |
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189 | if(p->flags & MPG123_FORCE_MONO) nf.channels = 1; |
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190 | if(p->flags & MPG123_FORCE_STEREO) nf.channels = 2; |
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191 | |||
192 | #ifndef NO_NTOM |
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193 | if(p->force_rate) |
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194 | { |
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195 | nf.rate = p->force_rate; |
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196 | if(cap_fit(fr,&nf,f0,2)) goto end; /* 16bit encodings */ |
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197 | if(cap_fit(fr,&nf,f0<=2 ? 2 : f0,f2)) goto end; /* 8bit encodings */ |
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198 | |||
199 | /* try again with different stereoness */ |
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200 | if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1; |
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201 | else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2; |
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202 | |||
203 | if(cap_fit(fr,&nf,f0,2)) goto end; /* 16bit encodings */ |
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204 | if(cap_fit(fr,&nf,f0<=2 ? 2 : f0,f2)) goto end; /* 8bit encodings */ |
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205 | |||
206 | if(NOQUIET) |
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207 | error3( "Unable to set up output format! Constraints: %s%s%liHz.", |
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208 | ( p->flags & MPG123_FORCE_STEREO ? "stereo, " : |
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209 | (p->flags & MPG123_FORCE_MONO ? "mono, " : "") ), |
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210 | (p->flags & MPG123_FORCE_8BIT ? "8bit, " : ""), |
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211 | p->force_rate ); |
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212 | /* if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */ |
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213 | |||
214 | fr->err = MPG123_BAD_OUTFORMAT; |
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215 | return -1; |
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216 | } |
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217 | #endif |
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218 | |||
219 | if(freq_fit(fr, &nf, f0, 2)) goto end; /* try rates with 16bit */ |
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220 | if(freq_fit(fr, &nf, f0<=2 ? 2 : f0, f2)) goto end; /* ... 8bit */ |
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221 | |||
222 | /* try again with different stereoness */ |
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223 | if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1; |
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224 | else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2; |
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225 | |||
226 | if(freq_fit(fr, &nf, f0, 2)) goto end; /* try rates with 16bit */ |
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227 | if(freq_fit(fr, &nf, f0<=2 ? 2 : f0, f2)) goto end; /* ... 8bit */ |
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228 | |||
229 | /* Here is the _bad_ end. */ |
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230 | if(NOQUIET) |
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231 | { |
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232 | error5( "Unable to set up output format! Constraints: %s%s%li, %li or %liHz.", |
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233 | ( p->flags & MPG123_FORCE_STEREO ? "stereo, " : |
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234 | (p->flags & MPG123_FORCE_MONO ? "mono, " : "") ), |
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235 | (p->flags & MPG123_FORCE_8BIT ? "8bit, " : ""), |
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236 | frame_freq(fr), frame_freq(fr)>>1, frame_freq(fr)>>2 ); |
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237 | } |
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238 | /* if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */ |
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239 | |||
240 | fr->err = MPG123_BAD_OUTFORMAT; |
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241 | return -1; |
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242 | |||
243 | end: /* Here is the _good_ end. */ |
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244 | /* we had a successful match, now see if there's a change */ |
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245 | if(nf.rate == fr->af.rate && nf.channels == fr->af.channels && nf.encoding == fr->af.encoding) |
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246 | { |
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247 | debug2("Old format with %i channels, and FORCE_MONO=%li", nf.channels, p->flags & MPG123_FORCE_MONO); |
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248 | return 0; /* the same format as before */ |
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249 | } |
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250 | else /* a new format */ |
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251 | { |
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252 | debug1("New format with %i channels!", nf.channels); |
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253 | fr->af.rate = nf.rate; |
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254 | fr->af.channels = nf.channels; |
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255 | fr->af.encoding = nf.encoding; |
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256 | /* Cache the size of one sample in bytes, for ease of use. */ |
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257 | if(fr->af.encoding & MPG123_ENC_8) |
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258 | fr->af.encsize = 1; |
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259 | else if(fr->af.encoding & MPG123_ENC_16) |
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260 | fr->af.encsize = 2; |
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261 | else if(fr->af.encoding & MPG123_ENC_32 || fr->af.encoding == MPG123_ENC_FLOAT_32) |
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262 | fr->af.encsize = 4; |
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263 | else if(fr->af.encoding == MPG123_ENC_FLOAT_64) |
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264 | fr->af.encsize = 8; |
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265 | else |
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266 | { |
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267 | if(NOQUIET) error1("Some unknown encoding??? (%i)", fr->af.encoding); |
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268 | |||
269 | fr->err = MPG123_BAD_OUTFORMAT; |
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270 | return -1; |
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271 | } |
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272 | return 1; |
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273 | } |
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274 | } |
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275 | |||
276 | int attribute_align_arg mpg123_format_none(mpg123_handle *mh) |
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277 | { |
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278 | int r; |
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279 | if(mh == NULL) return MPG123_ERR; |
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280 | |||
281 | r = mpg123_fmt_none(&mh->p); |
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282 | if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; } |
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283 | |||
284 | return r; |
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285 | } |
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286 | |||
287 | int attribute_align_arg mpg123_fmt_none(mpg123_pars *mp) |
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288 | { |
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289 | if(mp == NULL) return MPG123_BAD_PARS; |
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290 | |||
291 | if(PVERB(mp,3)) fprintf(stderr, "Note: Disabling all formats.\n"); |
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292 | |||
293 | memset(mp->audio_caps,0,sizeof(mp->audio_caps)); |
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294 | return MPG123_OK; |
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295 | } |
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296 | |||
297 | int attribute_align_arg mpg123_format_all(mpg123_handle *mh) |
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298 | { |
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299 | int r; |
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300 | if(mh == NULL) return MPG123_ERR; |
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301 | |||
302 | r = mpg123_fmt_all(&mh->p); |
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303 | if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; } |
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304 | |||
305 | return r; |
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306 | } |
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307 | |||
308 | int attribute_align_arg mpg123_fmt_all(mpg123_pars *mp) |
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309 | { |
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310 | size_t rate, ch, enc; |
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311 | if(mp == NULL) return MPG123_BAD_PARS; |
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312 | |||
313 | if(PVERB(mp,3)) fprintf(stderr, "Note: Enabling all formats.\n"); |
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314 | |||
315 | for(ch=0; ch < NUM_CHANNELS; ++ch) |
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316 | for(rate=0; rate < MPG123_RATES+1; ++rate) |
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317 | for(enc=0; enc < MPG123_ENCODINGS; ++enc) |
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318 | mp->audio_caps[ch][rate][enc] = good_enc(my_encodings[enc]) ? 1 : 0; |
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319 | |||
320 | return MPG123_OK; |
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321 | } |
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322 | |||
323 | int attribute_align_arg mpg123_format(mpg123_handle *mh, long rate, int channels, int encodings) |
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324 | { |
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325 | int r; |
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326 | if(mh == NULL) return MPG123_ERR; |
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327 | r = mpg123_fmt(&mh->p, rate, channels, encodings); |
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328 | if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; } |
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329 | |||
330 | return r; |
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331 | } |
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332 | |||
333 | int attribute_align_arg mpg123_fmt(mpg123_pars *mp, long rate, int channels, int encodings) |
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334 | { |
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335 | int ie, ic, ratei; |
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336 | int ch[2] = {0, 1}; |
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337 | if(mp == NULL) return MPG123_BAD_PARS; |
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338 | if(!(channels & (MPG123_MONO|MPG123_STEREO))) return MPG123_BAD_CHANNEL; |
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339 | |||
340 | if(PVERB(mp,3)) fprintf(stderr, "Note: Want to enable format %li/%i for encodings 0x%x.\n", rate, channels, encodings); |
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341 | |||
342 | if(!(channels & MPG123_STEREO)) ch[1] = 0; /* {0,0} */ |
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343 | else if(!(channels & MPG123_MONO)) ch[0] = 1; /* {1,1} */ |
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344 | ratei = rate2num(mp, rate); |
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345 | if(ratei < 0) return MPG123_BAD_RATE; |
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346 | |||
347 | /* now match the encodings */ |
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348 | for(ic = 0; ic < 2; ++ic) |
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349 | { |
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350 | for(ie = 0; ie < MPG123_ENCODINGS; ++ie) |
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351 | if(good_enc(my_encodings[ie]) && ((my_encodings[ie] & encodings) == my_encodings[ie])) |
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352 | mp->audio_caps[ch[ic]][ratei][ie] = 1; |
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353 | |||
354 | if(ch[0] == ch[1]) break; /* no need to do it again */ |
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355 | } |
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356 | |||
357 | return MPG123_OK; |
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358 | } |
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359 | |||
360 | int attribute_align_arg mpg123_format_support(mpg123_handle *mh, long rate, int encoding) |
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361 | { |
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362 | if(mh == NULL) return 0; |
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363 | else return mpg123_fmt_support(&mh->p, rate, encoding); |
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364 | } |
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365 | |||
366 | int attribute_align_arg mpg123_fmt_support(mpg123_pars *mp, long rate, int encoding) |
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367 | { |
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368 | int ch = 0; |
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369 | int ratei, enci; |
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370 | ratei = rate2num(mp, rate); |
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371 | enci = enc2num(encoding); |
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372 | if(mp == NULL || ratei < 0 || enci < 0) return 0; |
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373 | if(mp->audio_caps[0][ratei][enci]) ch |= MPG123_MONO; |
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374 | if(mp->audio_caps[1][ratei][enci]) ch |= MPG123_STEREO; |
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375 | return ch; |
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376 | } |
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377 | |||
378 | /* Call this one to ensure that any valid format will be something different than this. */ |
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379 | void invalidate_format(struct audioformat *af) |
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380 | { |
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381 | af->encoding = 0; |
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382 | af->rate = 0; |
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383 | af->channels = 0; |
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384 | } |
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385 | |||
386 | /* take into account: channels, bytes per sample -- NOT resampling!*/ |
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387 | off_t samples_to_bytes(mpg123_handle *fr , off_t s) |
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388 | { |
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389 | return s * fr->af.encsize * fr->af.channels; |
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390 | } |
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391 | |||
392 | off_t bytes_to_samples(mpg123_handle *fr , off_t b) |
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393 | { |
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394 | return b / fr->af.encsize / fr->af.channels; |
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395 | }>>>>>>>>=>=2>=2>=>=2>=2>> |