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/error.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/macros.h"
27
28 #include "wv.h"
29
ff_wv_parse_header(WvHeader * wv,const uint8_t * data)30 int ff_wv_parse_header(WvHeader *wv, const uint8_t *data)
31 {
32 memset(wv, 0, sizeof(*wv));
33
34 if (AV_RL32(data) != MKTAG('w', 'v', 'p', 'k'))
35 return AVERROR_INVALIDDATA;
36
37 wv->blocksize = AV_RL32(data + 4);
38 if (wv->blocksize < 24 || wv->blocksize > WV_BLOCK_LIMIT)
39 return AVERROR_INVALIDDATA;
40 wv->blocksize -= 24;
41
42 wv->version = AV_RL16(data + 8);
43 wv->total_samples = AV_RL32(data + 12);
44 wv->block_idx = AV_RL32(data + 16);
45 wv->samples = AV_RL32(data + 20);
46 wv->flags = AV_RL32(data + 24);
47 wv->crc = AV_RL32(data + 28);
48
49 wv->initial = !!(wv->flags & WV_FLAG_INITIAL_BLOCK);
50 wv->final = !!(wv->flags & WV_FLAG_FINAL_BLOCK);
51
52 return 0;
53 }
54