| 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 | } |