ref: 9228e6c128882dcb8bbd5a855eb7fb8a1a22d2a3
dir: /src/nulfile.c/
/* * File format: null (c) 2006-7 SoX contributors * Based on an original idea by Carsten Borchardt * * 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. */ #include "sox_i.h" #include <string.h> static int startread(sox_format_t * ft) { /* If format parameters are not given, set somewhat arbitrary * (but commonly used) defaults: */ if (!ft->signal.rate) { ft->signal.rate = 44100; sox_report("sample rate not specified; using %g", ft->signal.rate); } if (ft->signal.size <= 0) { ft->signal.size = SOX_SIZE_16BIT; sox_report("precision not specified; using %s", sox_size_bits_str[ft->signal.size]); } if (ft->signal.encoding == SOX_ENCODING_UNKNOWN) { ft->signal.encoding = SOX_ENCODING_SIGN2; sox_report("encoding not specified; using %s", sox_encodings_str[ft->signal.encoding]); } return SOX_SUCCESS; } static sox_size_t read(sox_format_t * ft UNUSED, sox_ssample_t *buf, sox_size_t len) { /* Reading from null generates silence i.e. (sox_sample_t)0. */ memset(buf, 0, sizeof(sox_ssample_t) * len); return len; /* Return number of samples "read". */ } static sox_size_t write(sox_format_t * ft UNUSED, const sox_ssample_t *buf UNUSED, sox_size_t len) { /* Writing to null just discards the samples */ return len; /* Return number of samples "written". */ } const sox_format_handler_t *sox_nul_format_fn(void); const sox_format_handler_t *sox_nul_format_fn(void) { static const char *names[] = { "null", "nul"/* with -t; deprecated*/, NULL}; static sox_format_handler_t handler = { names, SOX_FILE_DEVICE | SOX_FILE_PHONY | SOX_FILE_NOSTDIO, startread, read, 0, 0, write, 0, 0 }; return &handler; }