wv.h

Go to the documentation of this file.

/*
 * WavPack shared functions
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVFORMAT_WV_H
#define AVFORMAT_WV_H

#include <stdint.h>

#define WV_HEADER_SIZE 32

#define WV_FLAG_INITIAL_BLOCK (1 << 11)
#define WV_FLAG_FINAL_BLOCK   (1 << 12)

// specs say that maximum block size is 1Mb
#define WV_BLOCK_LIMIT 1048576

typedef struct WvHeader {
    uint32_t blocksize;     //< size of the block data (excluding the header)
    uint16_t version;       //< bitstream version
    uint32_t total_samples; //< total number of samples in the stream
    uint32_t block_idx;     //< index of the first sample in this block
    uint32_t samples;       //< number of samples in this block
    uint32_t flags;
    uint32_t crc;

    int initial, final;
} WvHeader;

/**
 * Parse a WavPack block header.
 *
 * @param wv   this struct will be filled with parse header information
 * @param data header data, must be WV_HEADER_SIZE bytes long
 *
 * @return 0 on success, a negative AVERROR code on failure
 */
int ff_wv_parse_header(WvHeader *wv, const uint8_t *data);

#endif /* AVFORMAT_WV_H */