src/cdr.c

   1 /* libSoX file format: cdda   (c) 2006-8 SoX contributors
   2  * Based on an original idea by David Elliott
   3  *
   4  * This library is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU Lesser General Public License as published by
   6  * the Free Software Foundation; either version 2.1 of the License, or (at
   7  * your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public License
  15  * along with this library; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include "sox_i.h"
  20
  21 static int start(sox_format_t * ft)
  22 {
  23   return lsx_check_read_params(ft, 2, 44100., SOX_ENCODING_SIGN2, 16, (uint64_t)0, sox_true);
  24 }
  25
  26 static int stopwrite(sox_format_t * ft)
  27 {
  28   unsigned const sector_num_samples = 588 * ft->signal.channels;
  29   unsigned i = ft->olength % sector_num_samples;
  30
  31   if (i) while (i++ < sector_num_samples)    /* Pad with silence to multiple */
  32     lsx_writew(ft, 0);                       /* of 1/75th of a second. */
  33   return SOX_SUCCESS;
  34 }
  35
  36 LSX_FORMAT_HANDLER(cdr)
  37 {
  38   static char const * const names[] = {"cdda", "cdr", NULL};
  39   static unsigned const write_encodings[] = {SOX_ENCODING_SIGN2, 16, 0, 0};
  40   static sox_rate_t const write_rates[] = {44100, 0};
  41   static sox_format_handler_t handler = {SOX_LIB_VERSION_CODE,
  42     "Red Book Compact Disc Digital Audio",
  43     names, SOX_FILE_BIG_END|SOX_FILE_STEREO,
  44     start, lsx_rawread, NULL,
  45     NULL, lsx_rawwrite, stopwrite,
  46     lsx_rawseek, write_encodings, write_rates, 0
  47   };
  48   return &handler;
  49 }