ref: 82528814c05f863eb65157fa9238a94f5d3847b5
dir: /src/pitch.c/
/* libSoX effect: change the audio pitch (i.e. change pitch but not tempo) * Copyright (c) 2007 robs@users.sourceforge.net * * 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 2.1 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, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * * 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 "sox_i.h" #include <string.h> static int getopts(sox_effect_t * effp, int argc, char **argv) { double d; char dummy, arg[100], **argv2 = malloc(argc * sizeof(*argv2)); int ret, pos = (argc && !strcmp(*argv, "-q"))? 1 : 0; if (argc <= pos || sscanf(argv[pos], "%lf %c", &d, &dummy) != 1) return lsx_usage(effp); effp->global_info->speed *= d = pow(2., d / 1200); /* cents --> factor */ sprintf(arg, "%g", 1 / d); memcpy(argv2, argv, argc * sizeof(*argv2)); argv2[pos] = arg; ret = sox_tempo_effect_fn()->getopts(effp, argc, argv2); free(argv2); return ret; } sox_effect_handler_t const * sox_pitch_effect_fn(void) { static sox_effect_handler_t handler; handler = *sox_tempo_effect_fn(); handler.name = "pitch"; handler.usage = "[-q] shift-in-cents [segment-ms [search-ms [overlap-ms]]]", handler.getopts = getopts; handler.flags &= ~SOX_EFF_LENGTH; return &handler; } sox_effect_handler_t const * sox_key_effect_fn(void) /* old name for pitch */ { static sox_effect_handler_t handler; handler = *sox_pitch_effect_fn(); handler.name = "key"; handler.flags |= SOX_EFF_DEPRECATED; return &handler; }