/*
  * Copyright (c) 2017 Paul B Mahol
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <mysofa.h>
 
 int main(int argc, char **argv)
 {
     struct MYSOFA_HRTF *hrtf;
     int sample_rate;
     int err, i, j;
 
     if (argc < 3) {
         printf("usage: %s input_SOFA_file output_directory\n", argv[0]);
         return 1;
     }
 
     hrtf = mysofa_load(argv[1], &err);
     if (!hrtf || err) {
         printf("invalid input SOFA file: %s\n", argv[1]);
         return 1;
     }
 
     if (hrtf->DataSamplingRate.elements != 1)
         goto fail;
     sample_rate = hrtf->DataSamplingRate.values[0];
 
     err = mkdir(argv[2], 0744);
     if (err)
         goto fail;
 
     err = chdir(argv[2]);
     if (err)
         goto fail;
 
     for (i = 0; i < hrtf->M; i++) {
         FILE *file;
         int bps = 32;
         int blkalign = 8;
         int bytespersec = blkalign * sample_rate;
         char filename[1024];
         int azi = hrtf->SourcePosition.values[i * 3];
         int ele = hrtf->SourcePosition.values[i * 3 + 1];
         int dis = hrtf->SourcePosition.values[i * 3 + 2];
         int size = 8 * hrtf->N;
         int offset = i * 2 * hrtf->N;
 
         snprintf(filename, sizeof(filename), "azi_%d_ele_%d_dis_%d.wav", azi, ele, dis);
         file = fopen(filename, "w+");
         fwrite("RIFF", 4, 1, file);
         fwrite("\xFF\xFF\xFF\xFF", 4, 1, file);
         fwrite("WAVE", 4, 1, file);
         fwrite("fmt ", 4, 1, file);
         fwrite("\x10\x00\00\00", 4, 1, file);
         fwrite("\x03\x00", 2, 1, file);
         fwrite("\x02\x00", 2, 1, file);
         fwrite(&sample_rate, 4, 1, file);
         fwrite(&bytespersec, 4, 1, file);
         fwrite(&blkalign, 2, 1, file);
         fwrite(&bps, 2, 1, file);
         fwrite("data", 4, 1, file);
         fwrite(&size, 4, 1, file);
 
         for (j = 0; j < hrtf->N; j++) {
             float l, r;
 
             l = hrtf->DataIR.values[offset + j];
             r = hrtf->DataIR.values[offset + j + hrtf->N];
             fwrite(&l, 4, 1, file);
             fwrite(&r, 4, 1, file);
         }
         fclose(file);
     }
 
 fail:
     mysofa_free(hrtf);
 
     return 0;
 }