ref: 0141f233364b96bee00bee7463c494a981f50e55
dir: /src/example1.c/
/* * Simple example of using SoX libraries * * Copyright (c) 2007 robs@users.sourceforge.net * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program 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 General * Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program. If not, write to the Free Software Foundation, Fifth * Floor, 51 Franklin Street, Boston, MA 02111-1301, USA. */ #include "sox.h" #include <stdio.h> #ifdef NDEBUG /* N.B. assert used with active statements so enable always */ #undef NDEBUG #endif #include <assert.h> static sox_format_t * in, * out; static int input_drain(sox_effect_t *effp, sox_sample_t * obuf, sox_size_t * osamp) { *osamp -= *osamp % effp->out_signal.channels; *osamp = sox_read(in, obuf, *osamp); *osamp -= *osamp % effp->out_signal.channels; if (!*osamp && in->sox_errno) fprintf(stderr, "%s: %s\n", in->filename, in->sox_errstr); return *osamp? SOX_SUCCESS : SOX_EOF; } static int output_flow(sox_effect_t *effp UNUSED, sox_sample_t const * ibuf, sox_sample_t * obuf UNUSED, sox_size_t * isamp, sox_size_t * osamp) { size_t len = sox_write(out, ibuf, *isamp); *osamp = 0; if (len != *isamp) { fprintf(stderr, "%s: %s\n", out->filename, out->sox_errstr); return SOX_EOF; } return SOX_SUCCESS; } static sox_effect_handler_t const * input_handler(void) { static sox_effect_handler_t handler = { "input", NULL, SOX_EFF_MCHAN, NULL, NULL, NULL, input_drain, NULL, NULL }; return &handler; } static sox_effect_handler_t const * output_handler(void) { static sox_effect_handler_t handler = { "output", NULL, SOX_EFF_MCHAN, NULL, NULL, output_flow, NULL, NULL, NULL }; return &handler; } /* * Reads input file, applies vol & reverb effects, stores in output file. * E.g. example1 monkey.au monkey.aiff */ int main(int argc, char * argv[]) { sox_effects_chain_t * chain; sox_effect_t e; char * vol[] = {"3dB"}; assert(argc == 3); assert(sox_format_init() == SOX_SUCCESS); assert(in = sox_open_read(argv[1], NULL, NULL, NULL)); assert(out = sox_open_write(NULL, argv[2], &in->signal, NULL, NULL, NULL, 0, NULL, 0)); chain = sox_create_effects_chain(&in->encoding, &out->encoding); sox_create_effect(&e, input_handler()); assert(sox_add_effect(chain, &e, &in->signal, &in->signal) == SOX_SUCCESS); sox_create_effect(&e, sox_find_effect("vol")); assert(e.handler.getopts(&e, 1, vol) == SOX_SUCCESS); assert(sox_add_effect(chain, &e, &in->signal, &in->signal) == SOX_SUCCESS); sox_create_effect(&e, sox_find_effect("reverb")); assert(e.handler.getopts(&e, 0, NULL) == SOX_SUCCESS); assert(sox_add_effect(chain, &e, &in->signal, &in->signal) == SOX_SUCCESS); sox_create_effect(&e, output_handler()); assert(sox_add_effect(chain, &e, &in->signal, &in->signal) == SOX_SUCCESS); sox_flow_effects(chain, NULL); sox_delete_effects(chain); sox_close(out); sox_close(in); sox_format_quit(); free(chain); return 0; }