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78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
/* libSoX SoundTool format handler (c) 2008 robs@users.sourceforge.net
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* See description in sndtl26.zip on the net.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at
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* your option) any later version.
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*
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* This library 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 Lesser
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "sox_i.h"
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#include <string.h>
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static char const ID1[6] = "SOUND\x1a";
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#define text_field_len (size_t)96 /* Includes null-terminator */
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static int start_read(sox_format_t * ft)
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{
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char id1[sizeof(ID1)], comments[text_field_len + 1];
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uint32_t nsamples;
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uint16_t rate;
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if (lsx_readchars(ft, id1, sizeof(ID1)) ||
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lsx_skipbytes(ft, (size_t) 10) || lsx_readdw(ft, &nsamples) ||
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lsx_readw(ft, &rate) || lsx_skipbytes(ft, (size_t) 6) ||
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lsx_readchars(ft, comments, text_field_len))
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return SOX_EOF;
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if (memcmp(ID1, id1, sizeof(id1))) {
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lsx_fail_errno(ft, SOX_EHDR, "soundtool: can't find SoundTool identifier");
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return SOX_EOF;
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}
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comments[text_field_len] = '\0'; /* Be defensive against incorrect files */
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sox_append_comments(&ft->oob.comments, comments);
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return lsx_check_read_params(ft, 1, (sox_rate_t)rate, SOX_ENCODING_UNSIGNED, 8, (uint64_t)nsamples, sox_true);
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}
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static int write_header(sox_format_t * ft)
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{
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char * comment = lsx_cat_comments(ft->oob.comments);
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char text_buf[text_field_len];
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uint64_t length = ft->olength? ft->olength:ft->signal.length;
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memset(text_buf, 0, sizeof(text_buf));
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strncpy(text_buf, comment, text_field_len - 1);
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free(comment);
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return lsx_writechars(ft, ID1, sizeof(ID1))
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|| lsx_writew (ft, 0) /* GSound: not used */
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|| lsx_writedw (ft, (unsigned) length) /* length of complete sample */
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|| lsx_writedw (ft, 0) /* first byte to play from sample */
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|| lsx_writedw (ft, (unsigned) length) /* first byte NOT to play from sample */
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|| lsx_writew (ft, min(65535, (unsigned)(ft->signal.rate + .5)))
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|| lsx_writew (ft, 0) /* sample size/type */
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|| lsx_writew (ft, 10) /* speaker driver volume */
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|| lsx_writew (ft, 4) /* speaker driver DC shift */
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|| lsx_writechars(ft, text_buf, sizeof(text_buf))? SOX_EOF:SOX_SUCCESS;
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}
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LSX_FORMAT_HANDLER(soundtool)
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{
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static char const * const names[] = {"sndt", NULL};
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static unsigned const write_encodings[] = {SOX_ENCODING_UNSIGNED, 8, 0, 0};
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static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE,
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"8-bit linear audio as used by Martin Hepperle's `SoundTool' of 1991/2",
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names, SOX_FILE_LIT_END | SOX_FILE_MONO | SOX_FILE_REWIND,
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start_read, lsx_rawread, NULL,
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write_header, lsx_rawwrite, NULL,
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lsx_rawseek, write_encodings, NULL, 0
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};
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return &handler;
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}
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