[c41637b] | 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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[85755eb] | 34 | #define MAX_STRETCH_RATIO 40. |
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[c41637b] | 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 | fvec_t *in; |
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| 46 | uint_t eof; |
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| 47 | |
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| 48 | RubberBandState rb; |
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| 49 | RubberBandOptions rboptions; |
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| 50 | }; |
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| 51 | |
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| 52 | extern RubberBandOptions aubio_get_rubberband_opts(const char_t *mode); |
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| 53 | |
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[a874c48] | 54 | static void aubio_timestretch_warmup (aubio_timestretch_t * p); |
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| 55 | static sint_t aubio_timestretch_fetch(aubio_timestretch_t *p); |
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| 56 | |
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[c41637b] | 57 | aubio_timestretch_t * |
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| 58 | new_aubio_timestretch (const char_t * uri, const char_t * mode, |
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| 59 | smpl_t stretchratio, uint_t hopsize, uint_t samplerate) |
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| 60 | { |
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| 61 | aubio_timestretch_t *p = AUBIO_NEW (aubio_timestretch_t); |
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| 62 | p->samplerate = samplerate; |
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| 63 | p->hopsize = hopsize; |
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| 64 | p->pitchscale = 1.; |
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| 65 | p->eof = 0; |
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| 66 | |
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| 67 | p->source = new_aubio_source(uri, samplerate, hopsize); |
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| 68 | if (!p->source) goto beach; |
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| 69 | if (samplerate == 0 ) p->samplerate = aubio_source_get_samplerate(p->source); |
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| 70 | |
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| 71 | p->in = new_fvec(hopsize); |
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| 72 | |
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| 73 | if (stretchratio <= MAX_STRETCH_RATIO && stretchratio >= MIN_STRETCH_RATIO) { |
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| 74 | p->stretchratio = stretchratio; |
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| 75 | } else { |
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| 76 | AUBIO_ERR("timestretch: stretchratio should be in the range [%.3f, %.3f], got %f\n", |
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| 77 | MIN_STRETCH_RATIO, MAX_STRETCH_RATIO, stretchratio); |
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| 78 | goto beach; |
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| 79 | } |
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| 80 | |
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| 81 | p->rboptions = aubio_get_rubberband_opts(mode); |
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| 82 | if (p->rboptions < 0) { |
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| 83 | AUBIO_ERR("timestretch: unknown time stretching method %s\n", mode); |
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| 84 | goto beach; |
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| 85 | } |
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| 86 | |
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| 87 | p->rb = rubberband_new(p->samplerate, 1, p->rboptions, p->stretchratio, p->pitchscale); |
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| 88 | rubberband_set_max_process_size(p->rb, p->hopsize); |
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| 89 | //rubberband_set_debug_level(p->rb, 10); |
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| 90 | |
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[a874c48] | 91 | aubio_timestretch_warmup(p); |
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| 92 | |
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| 93 | return p; |
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| 94 | |
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| 95 | beach: |
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| 96 | del_aubio_timestretch(p); |
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| 97 | return NULL; |
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| 98 | } |
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| 99 | |
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| 100 | static void |
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| 101 | aubio_timestretch_warmup (aubio_timestretch_t * p) |
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| 102 | { |
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[c41637b] | 103 | // warm up rubber band |
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| 104 | uint_t source_read = 0; |
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| 105 | unsigned int latency = MAX(p->hopsize, rubberband_get_latency(p->rb)); |
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| 106 | int available = rubberband_available(p->rb); |
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| 107 | while (available <= (int)latency) { |
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| 108 | aubio_source_do(p->source, p->in, &source_read); |
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| 109 | // for very short samples |
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| 110 | if (source_read < p->hopsize) p->eof = 1; |
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| 111 | rubberband_process(p->rb, (const float* const*)&(p->in->data), p->hopsize, p->eof); |
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| 112 | available = rubberband_available(p->rb); |
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| 113 | } |
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| 114 | } |
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| 115 | |
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| 116 | void |
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| 117 | del_aubio_timestretch (aubio_timestretch_t * p) |
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| 118 | { |
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[456a784] | 119 | if (p->in) del_fvec(p->in); |
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[c41637b] | 120 | if (p->source) del_aubio_source(p->source); |
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| 121 | if (p->rb) { |
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| 122 | rubberband_delete(p->rb); |
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| 123 | } |
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| 124 | AUBIO_FREE (p); |
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| 125 | } |
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| 126 | |
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[fd99f0d] | 127 | uint_t |
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| 128 | aubio_timestretch_get_samplerate (aubio_timestretch_t * p) |
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| 129 | { |
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| 130 | return p->samplerate; |
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| 131 | } |
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| 132 | |
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[c41637b] | 133 | uint_t aubio_timestretch_get_latency (aubio_timestretch_t * p) { |
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| 134 | return rubberband_get_latency(p->rb); |
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| 135 | } |
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| 136 | |
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| 137 | uint_t |
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| 138 | aubio_timestretch_set_stretch (aubio_timestretch_t * p, smpl_t stretch) |
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| 139 | { |
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| 140 | if (stretch >= MIN_STRETCH_RATIO && stretch <= MAX_STRETCH_RATIO) { |
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| 141 | p->stretchratio = stretch; |
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[85755eb] | 142 | rubberband_set_time_ratio(p->rb, 1./p->stretchratio); |
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[c41637b] | 143 | return AUBIO_OK; |
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| 144 | } else { |
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| 145 | AUBIO_ERR("timestretch: could not set stretch ratio to %.2f\n", stretch); |
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| 146 | return AUBIO_FAIL; |
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| 147 | } |
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| 148 | } |
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| 149 | |
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| 150 | smpl_t |
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| 151 | aubio_timestretch_get_stretch (aubio_timestretch_t * p) |
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| 152 | { |
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| 153 | return p->stretchratio; |
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| 154 | } |
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| 155 | |
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| 156 | uint_t |
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| 157 | aubio_timestretch_set_pitchscale (aubio_timestretch_t * p, smpl_t pitchscale) |
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| 158 | { |
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| 159 | if (pitchscale >= 0.0625 && pitchscale <= 4.) { |
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| 160 | p->pitchscale = pitchscale; |
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| 161 | rubberband_set_pitch_scale(p->rb, p->pitchscale); |
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| 162 | return AUBIO_OK; |
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| 163 | } else { |
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| 164 | AUBIO_ERR("timestretch: could not set pitchscale to %.2f\n", pitchscale); |
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| 165 | return AUBIO_FAIL; |
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| 166 | } |
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| 167 | } |
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| 168 | |
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| 169 | smpl_t |
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| 170 | aubio_timestretch_get_pitchscale (aubio_timestretch_t * p) |
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| 171 | { |
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| 172 | return p->pitchscale; |
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| 173 | } |
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| 174 | |
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| 175 | uint_t |
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| 176 | aubio_timestretch_set_transpose(aubio_timestretch_t * p, smpl_t transpose) |
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| 177 | { |
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| 178 | if (transpose >= -24. && transpose <= 24.) { |
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| 179 | smpl_t pitchscale = POW(2., transpose / 12.); |
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| 180 | return aubio_timestretch_set_pitchscale(p, pitchscale); |
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| 181 | } else { |
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| 182 | AUBIO_ERR("timestretch: could not set transpose to %.2f\n", transpose); |
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| 183 | return AUBIO_FAIL; |
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| 184 | } |
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| 185 | } |
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| 186 | |
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| 187 | smpl_t |
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| 188 | aubio_timestretch_get_transpose(aubio_timestretch_t * p) |
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| 189 | { |
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| 190 | return 12. * LOG(p->pitchscale) / LOG(2.0); |
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| 191 | } |
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| 192 | |
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[a874c48] | 193 | sint_t |
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| 194 | aubio_timestretch_fetch(aubio_timestretch_t *p) |
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[c41637b] | 195 | { |
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| 196 | uint_t source_read = p->hopsize; |
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| 197 | // read more samples from source until we have enough available or eof is reached |
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| 198 | int available = rubberband_available(p->rb); |
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| 199 | while ((available < (int)p->hopsize) && (p->eof == 0)) { |
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| 200 | aubio_source_do(p->source, p->in, &source_read); |
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| 201 | if (source_read < p->hopsize) { |
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| 202 | p->eof = 1; |
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| 203 | } |
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| 204 | rubberband_process(p->rb, (const float* const*)&(p->in->data), source_read, p->eof); |
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| 205 | available = rubberband_available(p->rb); |
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| 206 | } |
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[a874c48] | 207 | return source_read; |
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| 208 | } |
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| 209 | |
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| 210 | void |
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| 211 | aubio_timestretch_do (aubio_timestretch_t * p, fvec_t * out, uint_t * read) |
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| 212 | { |
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| 213 | int available = aubio_timestretch_fetch(p); |
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[c41637b] | 214 | // now retrieve the samples and write them into out->data |
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| 215 | if (available >= (int)p->hopsize) { |
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| 216 | rubberband_retrieve(p->rb, (float* const*)&(out->data), p->hopsize); |
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| 217 | *read = p->hopsize; |
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| 218 | } else { |
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| 219 | rubberband_retrieve(p->rb, (float* const*)&(out->data), available); |
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| 220 | *read = available; |
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| 221 | } |
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| 222 | } |
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| 223 | |
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[a0a4d01] | 224 | uint_t |
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| 225 | aubio_timestretch_seek (aubio_timestretch_t *p, uint_t pos) |
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| 226 | { |
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| 227 | p->eof = 0; |
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| 228 | rubberband_reset(p->rb); |
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| 229 | return aubio_source_seek(p->source, pos); |
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| 230 | } |
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| 231 | |
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[c41637b] | 232 | #endif |
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