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  1. /*
  2.  * WavPack shared functions
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include <stdint.h>
  22. #include <string.h>
  23.  
  24. #include "libavutil/common.h"
  25. #include "libavutil/intreadwrite.h"
  26.  
  27. #include "wv.h"
  28.  
  29. int ff_wv_parse_header(WvHeader *wv, const uint8_t *data)
  30. {
  31.     memset(wv, 0, sizeof(*wv));
  32.  
  33.     if (AV_RL32(data) != MKTAG('w', 'v', 'p', 'k'))
  34.         return AVERROR_INVALIDDATA;
  35.  
  36.     wv->blocksize     = AV_RL32(data + 4);
  37.     if (wv->blocksize < 24 || wv->blocksize > WV_BLOCK_LIMIT)
  38.         return AVERROR_INVALIDDATA;
  39.     wv->blocksize -= 24;
  40.  
  41.     wv->version       = AV_RL16(data + 8);
  42.     wv->total_samples = AV_RL32(data + 12);
  43.     wv->block_idx     = AV_RL32(data + 16);
  44.     wv->samples       = AV_RL32(data + 20);
  45.     wv->flags         = AV_RL32(data + 24);
  46.     wv->crc           = AV_RL32(data + 28);
  47.  
  48.     wv->initial = !!(wv->flags & WV_FLAG_INITIAL_BLOCK);
  49.     wv->final   = !!(wv->flags & WV_FLAG_FINAL_BLOCK);
  50.  
  51.     return 0;
  52. }
  53.