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562
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1 /*
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2 format:routines to deal with audio (output) format
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3
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4 copyright 2008 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
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9 #include "mpg123lib_intern.h"
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10 #include "debug.h"
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11
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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 static const int my_encodings[MPG123_ENCODINGS] =
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20 {
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21 MPG123_ENC_SIGNED_16,
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22 MPG123_ENC_UNSIGNED_16,
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23 MPG123_ENC_UNSIGNED_8,
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24 MPG123_ENC_SIGNED_8,
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25 MPG123_ENC_ULAW_8,
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26 MPG123_ENC_ALAW_8,
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27 MPG123_ENC_SIGNED_32,
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28 MPG123_ENC_UNSIGNED_32,
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29 MPG123_ENC_FLOAT_32,
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30 MPG123_ENC_FLOAT_64
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31 };
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32
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33 /* Check if encoding (mask) is a valid one in this build. */
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34 static int good_enc(int enc)
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35 {
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36 if(!(enc & MPG123_ENC_ANY)) return FALSE;
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37 #ifdef FLOATOUT
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38 #ifdef REAL_IS_FLOAT /* we know only 32bit*/
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39 if(enc != MPG123_ENC_FLOAT_32) return FALSE;
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40 #else
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41 if(enc != MPG123_ENC_FLOAT_64) return FALSE;
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42 #endif
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43 #else
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44 if(enc & MPG123_ENC_FLOAT) return FALSE;
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45 #endif
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46 if(enc & MPG123_ENC_32) return FALSE; /* Not supported yet. */
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47 if(enc == MPG123_ENC_UNSIGNED_16) return FALSE; /* Not supported yet... ever? */
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48
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49 return TRUE;
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50 }
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51
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52 void attribute_align_arg mpg123_rates(const long **list, size_t *number)
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53 {
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54 if(list != NULL) *list = my_rates;
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55 if(number != NULL) *number = sizeof(my_rates)/sizeof(long);
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56 }
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57
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58 /* Now that's a bit tricky... One build of the library knows only a subset of the encodings. */
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59 void attribute_align_arg mpg123_encodings(const int **list, size_t *number)
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60 {
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61 size_t offset = 0;
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62 size_t n = sizeof(my_encodings)/sizeof(int)-4; /* The last 4 are special. */
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63 #ifdef FLOATOUT /* Skip integer encodings. */
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64 n = 1;
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65 #ifdef REAL_IS_FLOAT /* we know only 32bit*/
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66 offset = 8; /* Only 32bit float */
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67 #else
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68 offset = 9; /* Only 64bit float */
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69 #endif
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70 #endif /* There should be a branch for 32bit integer; but that's not anywhere now. */
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71 if(list != NULL) *list = my_encodings+offset;
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72 if(number != NULL) *number = n;
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73 }
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74
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75 /* char audio_caps[NUM_CHANNELS][MPG123_RATES+1][MPG123_ENCODINGS]; */
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76
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77 static int rate2num(mpg123_pars *mp, long r)
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78 {
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79 int i;
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80 for(i=0;i<MPG123_RATES;i++) if(my_rates[i] == r) return i;
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81 if(mp && mp->force_rate != 0 && mp->force_rate == r) return MPG123_RATES;
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82
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83 return -1;
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84 }
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85
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86 static int enc2num(int encoding)
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87 {
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88 int i;
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89 for(i=0;i<MPG123_ENCODINGS;++i)
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90 if(my_encodings[i] == encoding) return i;
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91
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92 return -1;
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93 }
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94
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95 static int cap_fit(mpg123_handle *fr, struct audioformat *nf, int f0, int f2)
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96 {
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97 int i;
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98 int c = nf->channels-1;
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99 int rn = rate2num(&fr->p, nf->rate);
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100 if(rn >= 0) for(i=f0;i<f2;i++)
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101 {
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102 if(fr->p.audio_caps[c][rn][i])
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103 {
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104 nf->encoding = my_encodings[i];
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105 return 1;
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106 }
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107 }
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108 return 0;
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109 }
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110
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111 static int freq_fit(mpg123_handle *fr, struct audioformat *nf, int f0, int f2)
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112 {
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113 nf->rate = frame_freq(fr)>>fr->p.down_sample;
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114 if(cap_fit(fr,nf,f0,f2)) return 1;
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115 nf->rate>>=1;
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116 if(cap_fit(fr,nf,f0,f2)) return 1;
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117 nf->rate>>=1;
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118 if(cap_fit(fr,nf,f0,f2)) return 1;
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119 return 0;
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120 }
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121
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122 /* match constraints against supported audio formats, store possible setup in frame
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123 return: -1: error; 0: no format change; 1: format change */
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124 int frame_output_format(mpg123_handle *fr)
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125 {
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126 struct audioformat nf;
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127 int f0=0;
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128 int f2=MPG123_ENCODINGS-4; /* Omit the 32bit and float encodings. */
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129 mpg123_pars *p = &fr->p;
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130 /* initialize new format, encoding comes later */
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131 nf.channels = fr->stereo;
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132
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133 #ifdef FLOATOUT /* Skip integer encodings. */
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134 #ifdef REAL_IS_FLOAT /* we know only 32bit*/
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135 f0 = 8; /* Only 32bit float */
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136 #else
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137 f0 = 9; /* Only 64bit float */
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138 #endif
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139 f2 = f0+1; /* Only one encoding to try... */
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140 #else
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141 if(p->flags & MPG123_FORCE_8BIT) f0 = 2; /* skip the 16bit encodings */
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142 #endif /* There should be a branch for 32bit integer; but that's not anywhere now. */
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143
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144 /* force stereo is stronger */
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145 if(p->flags & MPG123_FORCE_MONO) nf.channels = 1;
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146 if(p->flags & MPG123_FORCE_STEREO) nf.channels = 2;
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147
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148 if(p->force_rate)
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149 {
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150 nf.rate = p->force_rate;
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151 if(cap_fit(fr,&nf,f0,2)) goto end; /* 16bit encodings */
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152 if(cap_fit(fr,&nf,2,f2)) goto end; /* 8bit encodings */
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153
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154 /* try again with different stereoness */
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155 if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1;
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156 else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2;
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157
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158 if(cap_fit(fr,&nf,f0,2)) goto end; /* 16bit encodings */
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159 if(cap_fit(fr,&nf,2,f2)) goto end; /* 8bit encodings */
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160
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161 if(NOQUIET)
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162 error3( "Unable to set up output format! Constraints: %s%s%liHz.",
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163 ( p->flags & MPG123_FORCE_STEREO ? "stereo, " :
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164 (p->flags & MPG123_FORCE_MONO ? "mono, " : "") ),
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165 (p->flags & MPG123_FORCE_8BIT ? "8bit, " : ""),
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166 p->force_rate );
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167 /* if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */
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168
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169 fr->err = MPG123_BAD_OUTFORMAT;
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170 return -1;
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171 }
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172
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173 if(freq_fit(fr, &nf, f0, 2)) goto end; /* try rates with 16bit */
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174 if(freq_fit(fr, &nf, 2, f2)) goto end; /* ... 8bit */
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175
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176 /* try again with different stereoness */
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177 if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1;
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178 else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2;
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179
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180 if(freq_fit(fr, &nf, f0, 2)) goto end; /* try rates with 16bit */
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181 if(freq_fit(fr, &nf, 2, f2)) goto end; /* ... 8bit */
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182
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183 /* Here is the _bad_ end. */
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184 if(NOQUIET)
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185 error5( "Unable to set up output format! Constraints: %s%s%li, %li or %liHz.",
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186 ( p->flags & MPG123_FORCE_STEREO ? "stereo, " :
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187 (p->flags & MPG123_FORCE_MONO ? "mono, " : "") ),
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188 (p->flags & MPG123_FORCE_8BIT ? "8bit, " : ""),
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189 frame_freq(fr), frame_freq(fr)>>1, frame_freq(fr)>>2 );
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190 /* if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */
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191
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192 fr->err = MPG123_BAD_OUTFORMAT;
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193 return -1;
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194
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195 end: /* Here is the _good_ end. */
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196 /* we had a successful match, now see if there's a change */
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197 if(nf.rate == fr->af.rate && nf.channels == fr->af.channels && nf.encoding == fr->af.encoding)
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198 {
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199 debug("Old format!");
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200 return 0; /* the same format as before */
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201 }
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202 else /* a new format */
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203 {
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204 debug("New format!");
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205 fr->af.rate = nf.rate;
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206 fr->af.channels = nf.channels;
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207 fr->af.encoding = nf.encoding;
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208 return 1;
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209 }
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210 }
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211
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212 int attribute_align_arg mpg123_format_none(mpg123_handle *mh)
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213 {
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214 int r;
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215 if(mh == NULL) return MPG123_ERR;
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216
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217 r = mpg123_fmt_none(&mh->p);
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218 if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; }
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219
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220 return r;
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221 }
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222
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223 int attribute_align_arg mpg123_fmt_none(mpg123_pars *mp)
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224 {
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225 if(mp == NULL) return MPG123_BAD_PARS;
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226
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227 if(PVERB(mp,3)) fprintf(stderr, "Note: Disabling all formats.\n");
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228
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229 memset(mp->audio_caps,0,sizeof(mp->audio_caps));
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230 return MPG123_OK;
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231 }
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232
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233 int attribute_align_arg mpg123_format_all(mpg123_handle *mh)
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234 {
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235 int r;
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236 if(mh == NULL) return MPG123_ERR;
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237
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238 r = mpg123_fmt_all(&mh->p);
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239 if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; }
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240
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241 return r;
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242 }
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243
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244 int attribute_align_arg mpg123_fmt_all(mpg123_pars *mp)
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245 {
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246 size_t rate, ch, enc;
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247 if(mp == NULL) return MPG123_BAD_PARS;
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248
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249 if(PVERB(mp,3)) fprintf(stderr, "Note: Enabling all formats.\n");
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250
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251 for(ch=0; ch < NUM_CHANNELS; ++ch)
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252 for(rate=0; rate < MPG123_RATES+1; ++rate)
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253 for(enc=0; enc < MPG123_ENCODINGS; ++enc)
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254 mp->audio_caps[ch][rate][enc] = good_enc(my_encodings[enc]) ? 1 : 0;
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255
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256 return MPG123_OK;
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257 }
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258
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259 int attribute_align_arg mpg123_format(mpg123_handle *mh, long rate, int channels, int encodings)
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260 {
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261 int r;
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262 if(mh == NULL) return MPG123_ERR;
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263 r = mpg123_fmt(&mh->p, rate, channels, encodings);
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264 if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; }
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265
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266 return r;
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267 }
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268
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269 int attribute_align_arg mpg123_fmt(mpg123_pars *mp, long rate, int channels, int encodings)
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270 {
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271 int ie, ic, ratei;
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272 int ch[2] = {0, 1};
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273 if(mp == NULL) return MPG123_BAD_PARS;
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274 if(!(channels & (MPG123_MONO|MPG123_STEREO))) return MPG123_BAD_CHANNEL;
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275
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276 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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277
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278 if(!(channels & MPG123_STEREO)) ch[1] = 0; /* {0,0} */
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279 else if(!(channels & MPG123_MONO)) ch[0] = 1; /* {1,1} */
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280 ratei = rate2num(mp, rate);
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281 if(ratei < 0) return MPG123_BAD_RATE;
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282
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283 /* now match the encodings */
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284 for(ic = 0; ic < 2; ++ic)
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285 {
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286 for(ie = 0; ie < MPG123_ENCODINGS; ++ie)
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287 if(good_enc(my_encodings[ie]) && ((my_encodings[ie] & encodings) == my_encodings[ie]))
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288 mp->audio_caps[ch[ic]][ratei][ie] = 1;
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289
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290 if(ch[0] == ch[1]) break; /* no need to do it again */
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291 }
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292
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293 return MPG123_OK;
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294 }
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295
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296 int attribute_align_arg mpg123_format_support(mpg123_handle *mh, long rate, int encoding)
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297 {
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298 if(mh == NULL) return 0;
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299 else return mpg123_fmt_support(&mh->p, rate, encoding);
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300 }
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301
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302 int attribute_align_arg mpg123_fmt_support(mpg123_pars *mp, long rate, int encoding)
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303 {
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304 int ch = 0;
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305 int ratei, enci;
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306 ratei = rate2num(mp, rate);
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307 enci = enc2num(encoding);
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308 if(mp == NULL || ratei < 0 || enci < 0) return 0;
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309 if(mp->audio_caps[0][ratei][enci]) ch |= MPG123_MONO;
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310 if(mp->audio_caps[1][ratei][enci]) ch |= MPG123_STEREO;
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311 return ch;
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312 }
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313
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314 /* Call this one to ensure that any valid format will be something different than this. */
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315 void invalidate_format(struct audioformat *af)
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316 {
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317 af->encoding = 0;
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318 af->rate = 0;
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319 af->channels = 0;
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320 }
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321
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