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 30int 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