FFmpeg
wv.c
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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 
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 }
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
uint32_t samples
Definition: wv.h:39
int initial
Definition: wv.h:43
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
#define WV_BLOCK_LIMIT
Definition: wv.h:32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
uint8_t
uint32_t flags
Definition: wv.h:40
Definition: wv.h:34
int final
Definition: wv.h:43
uint32_t crc
Definition: wv.h:41
uint16_t version
Definition: wv.h:36
int ff_wv_parse_header(WvHeader *wv, const uint8_t *data)
Parse a WavPack block header.
Definition: wv.c:29
uint32_t total_samples
Definition: wv.h:37
uint32_t block_idx
Definition: wv.h:38
common internal and external API header
#define WV_FLAG_INITIAL_BLOCK
Definition: wv.h:28
#define MKTAG(a, b, c, d)
Definition: common.h:366
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
#define WV_FLAG_FINAL_BLOCK
Definition: wv.h:29
uint32_t blocksize
Definition: wv.h:35