src/example5.c

   1 /* Simple example of using SoX libraries
   2  *
   3  * Copyright (c) 2009 robs@users.sourceforge.net
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This program 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 General
  13  * Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #ifdef NDEBUG /* N.B. assert used with active statements so enable always. */
  21 #undef NDEBUG /* Must undef above assert.h or other that might include it. */
  22 #endif
  23
  24 #include "sox.h"
  25 #include "util.h"
  26 #include <stdio.h>
  27 #include <assert.h>
  28
  29 /* Example of reading and writing audio files stored in memory buffers
  30  * rather than actual files.
  31  *
  32  * Usage: example5 input output
  33  */
  34
  35 /* Uncomment following line for fixed instead of malloc'd buffer: */
  36 /*#define FIXED_BUFFER */
  37
  38 #if defined FIXED_BUFFER
  39 #define buffer_size 123456
  40 static char buffer[buffer_size];
  41 #endif
  42
  43 int main(int argc, char * argv[])
  44 {
  45   static sox_format_t * in, * out; /* input and output files */
  46   #define MAX_SAMPLES (size_t)2048
  47   sox_sample_t samples[MAX_SAMPLES]; /* Temporary store whilst copying. */
  48 #if !defined FIXED_BUFFER
  49   char * buffer;
  50   size_t buffer_size;
  51 #endif
  52   size_t number_read;
  53
  54   assert(argc == 3);
  55
  56   /* All libSoX applications must start by initialising the SoX library */
  57   assert(sox_init() == SOX_SUCCESS);
  58
  59   /* Open the input file (with default parameters) */
  60   assert((in = sox_open_read(argv[1], NULL, NULL, NULL)));
  61 #if defined FIXED_BUFFER
  62   assert((out = sox_open_mem_write(buffer, buffer_size, &in->signal, NULL, "sox", NULL)));
  63 #else
  64   assert((out = sox_open_memstream_write(&buffer, &buffer_size, &in->signal, NULL, "sox", NULL)));
  65 #endif
  66   while ((number_read = sox_read(in, samples, MAX_SAMPLES)))
  67     assert(sox_write(out, samples, number_read) == number_read);
  68   sox_close(out);
  69   sox_close(in);
  70
  71   assert((in = sox_open_mem_read(buffer, buffer_size, NULL, NULL, NULL)));
  72   assert((out = sox_open_write(argv[2], &in->signal, NULL, NULL, NULL, NULL)));
  73   while ((number_read = sox_read(in, samples, MAX_SAMPLES)))
  74     assert(sox_write(out, samples, number_read) == number_read);
  75   sox_close(out);
  76   sox_close(in);
  77 #if !defined FIXED_BUFFER
  78   free(buffer);
  79 #endif
  80
  81   sox_quit();
  82   return 0;
  83 }