blob: 0f4f80761acab039b6d763d71bd07977f2e8f823
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 |