src/wve.c

   1 /* libSoX file format: Psion wve   (c) 2008 robs@users.sourceforge.net
   2  *
   3  * See http://filext.com/file-extension/WVE
   4  *
   5  * This library is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Lesser General Public License as published by
   7  * the Free Software Foundation; either version 2.1 of the License, or (at
   8  * your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public License
  16  * along with this library; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #include "sox_i.h"
  21 #include <string.h>
  22
  23 static char const ID1[18] = "ALawSoundFile**\0\017\020";
  24 static char const ID2[] = {0,0,0,1,0,0,0,0,0,0}; /* pad & repeat info: ignore */
  25
  26 static int start_read(sox_format_t * ft)
  27 {
  28   char buf[sizeof(ID1)];
  29   uint32_t num_samples;
  30
  31   if (lsx_readchars(ft, buf, sizeof(buf)) || lsx_readdw(ft, &num_samples) ||
  32       lsx_skipbytes(ft, sizeof(ID2)))
  33     return SOX_EOF;
  34   if (memcmp(ID1, buf, sizeof(buf))) {
  35     lsx_fail_errno(ft, SOX_EHDR, "wve: can't find Psion identifier");
  36     return SOX_EOF;
  37   }
  38   return lsx_check_read_params(ft, 1, 8000., SOX_ENCODING_ALAW, 8, (uint64_t)num_samples, sox_true);
  39 }
  40
  41 static int write_header(sox_format_t * ft)
  42 {
  43   uint64_t size64 = ft->olength? ft->olength:ft->signal.length;
  44   unsigned size = size64 > UINT_MAX ? 0 : (unsigned)size64;
  45   return lsx_writechars(ft, ID1, sizeof(ID1))
  46       || lsx_writedw(ft, size)
  47       || lsx_writechars(ft, ID2, sizeof(ID2))? SOX_EOF:SOX_SUCCESS;
  48 }
  49
  50 LSX_FORMAT_HANDLER(wve)
  51 {
  52   static char const * const names[] = {"wve", NULL};
  53   static sox_rate_t   const write_rates[] = {8000, 0};
  54   static unsigned     const write_encodings[] = {SOX_ENCODING_ALAW, 8, 0, 0};
  55   static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE,
  56     "Psion 3 audio format",
  57     names, SOX_FILE_BIG_END | SOX_FILE_MONO | SOX_FILE_REWIND,
  58     start_read, lsx_rawread, NULL,
  59     write_header, lsx_rawwrite, NULL,
  60     lsx_rawseek, write_encodings, write_rates, 0
  61   };
  62   return &handler;
  63 }