| 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 | #ifndef AVFORMAT_WV_H |
| 22 | #define AVFORMAT_WV_H |
| 23 | |
| 24 | #include <stdint.h> |
| 25 | |
| 26 | #define WV_HEADER_SIZE 32 |
| 27 | |
| 28 | #define WV_FLAG_INITIAL_BLOCK (1 << 11) |
| 29 | #define WV_FLAG_FINAL_BLOCK (1 << 12) |
| 30 | |
| 31 | // specs say that maximum block size is 1Mb |
| 32 | #define WV_BLOCK_LIMIT 1048576 |
| 33 | |
| 34 | typedef struct WvHeader { |
| 35 | uint32_t blocksize; //< size of the block data (excluding the header) |
| 36 | uint16_t version; //< bitstream version |
| 37 | uint32_t total_samples; //< total number of samples in the stream |
| 38 | uint32_t block_idx; //< index of the first sample in this block |
| 39 | uint32_t samples; //< number of samples in this block |
| 40 | uint32_t flags; |
| 41 | uint32_t crc; |
| 42 | |
| 43 | int initial, final; |
| 44 | } WvHeader; |
| 45 | |
| 46 | /** |
| 47 | * Parse a WavPack block header. |
| 48 | * |
| 49 | * @param wv this struct will be filled with parse header information |
| 50 | * @param data header data, must be WV_HEADER_SIZE bytes long |
| 51 | * |
| 52 | * @return 0 on success, a negative AVERROR code on failure |
| 53 | */ |
| 54 | int ff_wv_parse_header(WvHeader *wv, const uint8_t *data); |
| 55 | |
| 56 | #endif /* AVFORMAT_WV_H */ |