ref: 9228e6c128882dcb8bbd5a855eb7fb8a1a22d2a3
dir: /src/tempo.c++/
/* * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser * General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library. If not, write to the Free Software Foundation, * Fifth Floor, 51 Franklin Street, Boston, MA 02111-1301, USA. */ /* * (c) 2007 robs@users.sourceforge.net * * libSoX tempo effect: adjust the audio tempo (but not key) * * Adjustment is given as the ratio of the new tempo to the old tempo. * * libSoX key effect: adjust the audio pitch (but not tempo) * * Adjustment is given as a number of cents (100ths of a semitone) to * change. Implementation comprises a tempo change (performed by tempo) * and a speed change performed by whichever resampling effect is in effect. */ #include <soundtouch/SoundTouch.h> extern "C" { #include "sox_i.h" #include <math.h> #include <string.h> typedef struct tempo { soundtouch::SAMPLETYPE * buffer; soundtouch::SoundTouch * sound_touch; double factor; } * tempo_t; assert_static(sizeof(struct tempo) <= SOX_MAX_EFFECT_PRIVSIZE, /* else */ tempo_PRIVSIZE_too_big); static int create(sox_effect_t * effp, int n, char * * argv) { tempo_t p = (tempo_t) effp->priv; char dummy; if (n == 1 && sscanf(*argv, "%lf %c", &p->factor, &dummy) == 1 && p->factor >=0.05 && p->factor <= 20) return SOX_SUCCESS; return sox_usage(effp); } static int start(sox_effect_t * effp) { tempo_t p = (tempo_t) effp->priv; if (!p->factor) return SOX_EFF_NULL; p->buffer = new soundtouch::SAMPLETYPE[effp->global_info->global_info->bufsiz]; p->sound_touch = new soundtouch::SoundTouch; p->sound_touch->setSampleRate(static_cast<uint>(effp->ininfo.rate + 0.5)); p->sound_touch->setTempoChange(100 / p->factor - 100); p->sound_touch->setChannels(1); p->sound_touch->setPitchSemiTones(0); p->sound_touch->setRateChange(0); p->sound_touch->setSetting(SETTING_USE_AA_FILTER, 0); return SOX_SUCCESS; } static int flow(sox_effect_t * effp, const sox_ssample_t * ibuf, sox_ssample_t * obuf, sox_size_t * isamp, sox_size_t * osamp) { tempo_t p = (tempo_t) effp->priv; sox_size_t i; sox_size_t idone = 0; sox_size_t odone = p->sound_touch->receiveSamples(p->buffer, *osamp); for (i = 0; i < odone; ++i) obuf[i] = SOX_FLOAT_32BIT_TO_SAMPLE(p->buffer[i], effp->clips); if (odone < *osamp) if (*isamp && odone < *osamp) { for (i = 0; i < *isamp; ++i) p->buffer[i] = SOX_SAMPLE_TO_FLOAT_32BIT(ibuf[i], effp->clips); p->sound_touch->putSamples(p->buffer, idone = *isamp); } *isamp = idone; *osamp = odone; return SOX_SUCCESS; } static int drain(sox_effect_t * effp, sox_ssample_t * obuf, sox_size_t * osamp) { static sox_size_t isamp = 0; tempo_t p = (tempo_t) effp->priv; p->sound_touch->flush(); return flow(effp, 0, obuf, &isamp, osamp); } static int stop(sox_effect_t * effp) { tempo_t p = (tempo_t) effp->priv; delete p->sound_touch; delete[] p->buffer; return SOX_SUCCESS; } sox_effect_handler_t const *sox_tempo_effect_fn(void) { static sox_effect_handler_t handler = { "tempo", "factor", SOX_EFF_LENGTH, create, start, flow, drain, stop, 0}; return &handler; } static int key_create(sox_effect_t * effp, int argc, char * * argv) { double d; char dummy, arg[100]; char * args[10]; sox_size_t nargs = 0; if (!argc || sscanf(*argv, "%lf %c", &d, &dummy) != 1) return sox_usage(effp); d = pow(2., d/1200); effp->global_info->speed *= d; sprintf(arg, "%g", d); args[nargs++] = arg; ++argv, --argc; return argc ? sox_usage(effp) : sox_tempo_effect_fn()->getopts(effp, nargs, args); } sox_effect_handler_t const * sox_key_effect_fn(void) { static sox_effect_handler_t handler; handler = *sox_tempo_effect_fn(); handler.name = "key"; handler.usage = "shift-in-cents"; handler.getopts = key_create; return &handler; } } // extern "C"