1 | /* |
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2 | Copyright (C) 2016 Paul Brossier <piem@aubio.org> |
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3 | |
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4 | This file is part of aubio. |
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5 | |
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6 | aubio is free software: you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation, either version 3 of the License, or |
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9 | (at your option) any later version. |
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10 | |
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11 | aubio is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
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18 | |
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19 | */ |
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20 | |
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21 | #include "config.h" |
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22 | |
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23 | #ifdef HAVE_RUBBERBAND |
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24 | |
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25 | #include "aubio_priv.h" |
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26 | #include "fvec.h" |
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27 | #include "fmat.h" |
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28 | #include "io/source.h" |
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29 | #include "effects/timestretch.h" |
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30 | |
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31 | #include "rubberband/rubberband-c.h" |
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32 | |
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33 | #define MIN_STRETCH_RATIO 0.025 |
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34 | #define MAX_STRETCH_RATIO 40. |
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35 | |
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36 | /** generic time stretching structure */ |
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37 | struct _aubio_timestretch_t |
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38 | { |
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39 | uint_t samplerate; /**< samplerate */ |
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40 | uint_t hopsize; /**< hop size */ |
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41 | smpl_t stretchratio; /**< time ratio */ |
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42 | smpl_t pitchscale; /**< pitch scale */ |
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43 | |
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44 | aubio_source_t *source; |
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45 | uint_t source_hopsize; /**< hop size at which the source is read */ |
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46 | fvec_t *in; |
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47 | uint_t eof; |
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48 | |
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49 | RubberBandState rb; |
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50 | RubberBandOptions rboptions; |
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51 | }; |
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52 | |
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53 | extern RubberBandOptions aubio_get_rubberband_opts(const char_t *mode); |
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54 | |
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55 | static void aubio_timestretch_warmup (aubio_timestretch_t * p); |
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56 | static sint_t aubio_timestretch_fetch(aubio_timestretch_t *p, uint_t fetch); |
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57 | |
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58 | aubio_timestretch_t * |
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59 | new_aubio_timestretch (const char_t * uri, const char_t * mode, |
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60 | smpl_t stretchratio, uint_t hopsize, uint_t samplerate) |
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61 | { |
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62 | aubio_timestretch_t *p = AUBIO_NEW (aubio_timestretch_t); |
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63 | p->samplerate = samplerate; |
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64 | p->hopsize = hopsize; |
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65 | p->source_hopsize = hopsize; |
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66 | p->pitchscale = 1.; |
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67 | p->eof = 0; |
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68 | |
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69 | p->source = new_aubio_source(uri, samplerate, p->source_hopsize); |
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70 | if (!p->source) goto beach; |
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71 | if (samplerate == 0 ) p->samplerate = aubio_source_get_samplerate(p->source); |
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72 | |
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73 | p->in = new_fvec(p->source_hopsize); |
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74 | |
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75 | if (stretchratio <= MAX_STRETCH_RATIO && stretchratio >= MIN_STRETCH_RATIO) { |
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76 | p->stretchratio = stretchratio; |
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77 | } else { |
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78 | AUBIO_ERR("timestretch: stretchratio should be in the range [%.3f, %.3f], got %f\n", |
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79 | MIN_STRETCH_RATIO, MAX_STRETCH_RATIO, stretchratio); |
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80 | goto beach; |
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81 | } |
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82 | |
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83 | p->rboptions = aubio_get_rubberband_opts(mode); |
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84 | if (p->rboptions < 0) { |
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85 | AUBIO_ERR("timestretch: unknown time stretching method %s\n", mode); |
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86 | goto beach; |
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87 | } |
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88 | |
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89 | p->rb = rubberband_new(p->samplerate, 1, p->rboptions, p->stretchratio, p->pitchscale); |
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90 | rubberband_set_max_process_size(p->rb, p->source_hopsize); |
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91 | //rubberband_set_debug_level(p->rb, 10); |
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92 | |
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93 | aubio_timestretch_warmup(p); |
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94 | |
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95 | return p; |
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96 | |
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97 | beach: |
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98 | del_aubio_timestretch(p); |
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99 | return NULL; |
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100 | } |
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101 | |
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102 | static void |
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103 | aubio_timestretch_warmup (aubio_timestretch_t * p) |
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104 | { |
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105 | // warm up rubber band |
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106 | unsigned int latency = MAX(p->hopsize, rubberband_get_latency(p->rb)); |
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107 | aubio_timestretch_fetch(p, latency); |
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108 | } |
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109 | |
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110 | void |
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111 | del_aubio_timestretch (aubio_timestretch_t * p) |
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112 | { |
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113 | if (p->in) del_fvec(p->in); |
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114 | if (p->source) del_aubio_source(p->source); |
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115 | if (p->rb) { |
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116 | rubberband_delete(p->rb); |
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117 | } |
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118 | AUBIO_FREE (p); |
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119 | } |
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120 | |
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121 | uint_t |
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122 | aubio_timestretch_get_samplerate (aubio_timestretch_t * p) |
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123 | { |
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124 | return p->samplerate; |
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125 | } |
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126 | |
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127 | uint_t aubio_timestretch_get_latency (aubio_timestretch_t * p) { |
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128 | return rubberband_get_latency(p->rb); |
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129 | } |
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130 | |
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131 | uint_t |
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132 | aubio_timestretch_set_stretch (aubio_timestretch_t * p, smpl_t stretch) |
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133 | { |
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134 | if (stretch >= MIN_STRETCH_RATIO && stretch <= MAX_STRETCH_RATIO) { |
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135 | p->stretchratio = stretch; |
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136 | rubberband_set_time_ratio(p->rb, 1./p->stretchratio); |
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137 | return AUBIO_OK; |
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138 | } else { |
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139 | AUBIO_ERR("timestretch: could not set stretch ratio to %.2f\n", stretch); |
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140 | return AUBIO_FAIL; |
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141 | } |
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142 | } |
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143 | |
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144 | smpl_t |
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145 | aubio_timestretch_get_stretch (aubio_timestretch_t * p) |
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146 | { |
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147 | return p->stretchratio; |
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148 | } |
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149 | |
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150 | uint_t |
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151 | aubio_timestretch_set_pitchscale (aubio_timestretch_t * p, smpl_t pitchscale) |
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152 | { |
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153 | if (pitchscale >= 0.0625 && pitchscale <= 4.) { |
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154 | p->pitchscale = pitchscale; |
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155 | rubberband_set_pitch_scale(p->rb, p->pitchscale); |
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156 | return AUBIO_OK; |
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157 | } else { |
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158 | AUBIO_ERR("timestretch: could not set pitchscale to %.2f\n", pitchscale); |
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159 | return AUBIO_FAIL; |
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160 | } |
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161 | } |
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162 | |
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163 | smpl_t |
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164 | aubio_timestretch_get_pitchscale (aubio_timestretch_t * p) |
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165 | { |
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166 | return p->pitchscale; |
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167 | } |
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168 | |
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169 | uint_t |
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170 | aubio_timestretch_set_transpose(aubio_timestretch_t * p, smpl_t transpose) |
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171 | { |
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172 | if (transpose >= -24. && transpose <= 24.) { |
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173 | smpl_t pitchscale = POW(2., transpose / 12.); |
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174 | return aubio_timestretch_set_pitchscale(p, pitchscale); |
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175 | } else { |
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176 | AUBIO_ERR("timestretch: could not set transpose to %.2f\n", transpose); |
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177 | return AUBIO_FAIL; |
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178 | } |
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179 | } |
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180 | |
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181 | smpl_t |
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182 | aubio_timestretch_get_transpose(aubio_timestretch_t * p) |
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183 | { |
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184 | return 12. * LOG(p->pitchscale) / LOG(2.0); |
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185 | } |
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186 | |
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187 | sint_t |
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188 | aubio_timestretch_fetch(aubio_timestretch_t *p, uint_t length) |
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189 | { |
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190 | uint_t source_read = p->source_hopsize; |
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191 | // read more samples from source until we have enough available or eof is reached |
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192 | int available = rubberband_available(p->rb); |
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193 | while ((available < (int)length) && (p->eof == 0)) { |
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194 | aubio_source_do(p->source, p->in, &source_read); |
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195 | if (source_read < p->source_hopsize) { |
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196 | p->eof = 1; |
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197 | } |
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198 | rubberband_process(p->rb, (const float* const*)&(p->in->data), source_read, p->eof); |
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199 | available = rubberband_available(p->rb); |
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200 | } |
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201 | return available; |
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202 | } |
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203 | |
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204 | void |
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205 | aubio_timestretch_do (aubio_timestretch_t * p, fvec_t * out, uint_t * read) |
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206 | { |
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207 | int available = aubio_timestretch_fetch(p, p->hopsize); |
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208 | // now retrieve the samples and write them into out->data |
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209 | if (available >= (int)p->hopsize) { |
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210 | rubberband_retrieve(p->rb, (float* const*)&(out->data), p->hopsize); |
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211 | *read = p->hopsize; |
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212 | } else { |
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213 | rubberband_retrieve(p->rb, (float* const*)&(out->data), available); |
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214 | *read = available; |
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215 | } |
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216 | } |
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217 | |
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218 | uint_t |
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219 | aubio_timestretch_seek (aubio_timestretch_t *p, uint_t pos) |
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220 | { |
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221 | p->eof = 0; |
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222 | rubberband_reset(p->rb); |
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223 | return aubio_source_seek(p->source, pos); |
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224 | } |
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225 | |
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226 | #endif |
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