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113 lines
3.9 KiB
113 lines
3.9 KiB
/* Simple example of using SoX libraries
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*
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* Copyright (c) 2007-9 robs@users.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef NDEBUG /* N.B. assert used with active statements so enable always. */
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#undef NDEBUG /* Must undef above assert.h or other that might include it. */
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#endif
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#include "sox.h"
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#include "util.h"
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#include <stdio.h>
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#include <assert.h>
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/*
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* Example of a custom output message handler.
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*/
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static void output_message(unsigned level, const char *filename, const char *fmt, va_list ap)
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{
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char const * const str[] = {"FAIL", "WARN", "INFO", "DBUG"};
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if (sox_globals.verbosity >= level) {
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char base_name[128];
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sox_basename(base_name, sizeof(base_name), filename);
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fprintf(stderr, "%s %s: ", str[min(level - 1, 3)], base_name);
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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}
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}
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/*
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* On an alsa capable system, plays an audio file starting 10 seconds in.
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* Copes with sample-rate and channel change if necessary since its
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* common for audio drivers to support a subset of rates and channel
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* counts.
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* E.g. example3 song2.ogg
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*
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* Can easily be changed to work with other audio device drivers supported
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* by libSoX; e.g. "oss", "ao", "coreaudio", etc.
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* See the soxformat(7) manual page.
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*/
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int main(int argc, char * argv[])
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{
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static sox_format_t * in, * out; /* input and output files */
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sox_effects_chain_t * chain;
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sox_effect_t * e;
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sox_signalinfo_t interm_signal;
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char * args[10];
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assert(argc == 2);
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sox_globals.output_message_handler = output_message;
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sox_globals.verbosity = 1;
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assert(sox_init() == SOX_SUCCESS);
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assert((in = sox_open_read(argv[1], NULL, NULL, NULL)));
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/* Change "alsa" in this line to use an alternative audio device driver: */
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assert((out= sox_open_write("default", &in->signal, NULL, "alsa", NULL, NULL)));
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chain = sox_create_effects_chain(&in->encoding, &out->encoding);
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interm_signal = in->signal; /* NB: deep copy */
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e = sox_create_effect(sox_find_effect("input"));
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args[0] = (char *)in, assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
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assert(sox_add_effect(chain, e, &interm_signal, &in->signal) == SOX_SUCCESS);
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free(e);
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e = sox_create_effect(sox_find_effect("trim"));
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args[0] = "10", assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
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assert(sox_add_effect(chain, e, &interm_signal, &in->signal) == SOX_SUCCESS);
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free(e);
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if (in->signal.rate != out->signal.rate) {
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e = sox_create_effect(sox_find_effect("rate"));
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assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS);
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assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS);
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free(e);
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}
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if (in->signal.channels != out->signal.channels) {
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e = sox_create_effect(sox_find_effect("channels"));
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assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS);
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assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS);
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free(e);
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}
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e = sox_create_effect(sox_find_effect("output"));
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args[0] = (char *)out, assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
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assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS);
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free(e);
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sox_flow_effects(chain, NULL, NULL);
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sox_delete_effects_chain(chain);
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sox_close(out);
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sox_close(in);
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sox_quit();
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return 0;
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}
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