src/output.c

   1 /* libSoX effect: Output audio to a file   (c) 2008 robs@users.sourceforge.net
   2  *
   3  * This library is free software; you can redistribute it and/or modify it
   4  * under the terms of the GNU Lesser General Public License as published by
   5  * the Free Software Foundation; either version 2.1 of the License, or (at
   6  * your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this library; if not, write to the Free Software Foundation,
  15  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  16  */
  17
  18 #include "sox_i.h"
  19
  20 typedef struct {sox_format_t * file;} priv_t;
  21
  22 static int getopts(sox_effect_t * effp, int argc, char * * argv)
  23 {
  24   priv_t * p = (priv_t *)effp->priv;
  25   if (argc != 2 || !(p->file = (sox_format_t *)argv[1]) || p->file->mode != 'w')
  26     return SOX_EOF;
  27   return SOX_SUCCESS;
  28 }
  29
  30 static int flow(sox_effect_t *effp, sox_sample_t const * ibuf,
  31     sox_sample_t * obuf, size_t * isamp, size_t * osamp)
  32 {
  33   priv_t * p = (priv_t *)effp->priv;
  34   /* Write out *isamp samples */
  35   size_t len = sox_write(p->file, ibuf, *isamp);
  36
  37   /* len is the number of samples that were actually written out; if this is
  38    * different to *isamp, then something has gone wrong--most often, it's
  39    * out of disc space */
  40   if (len != *isamp) {
  41     lsx_fail("%s: %s", p->file->filename, p->file->sox_errstr);
  42     return SOX_EOF;
  43   }
  44
  45   /* Outputting is the last `effect' in the effect chain so always passes
  46    * 0 samples on to the next effect (as there isn't one!) */
  47   (void)obuf, *osamp = 0;
  48   return SOX_SUCCESS; /* All samples output successfully */
  49 }
  50
  51 sox_effect_handler_t const * lsx_output_effect_fn(void)
  52 {
  53   static sox_effect_handler_t handler = {
  54     "output", NULL, SOX_EFF_MCHAN | SOX_EFF_INTERNAL,
  55     getopts, NULL, flow, NULL, NULL, NULL, sizeof(priv_t)
  56   };
  57   return &handler;
  58 }
  59