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2ba45a60 DM |
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 | } |