Libav
vocdec.c
Go to the documentation of this file.
1 /*
2  * Creative Voice File demuxer.
3  * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "voc.h"
24 #include "internal.h"
25 
26 static int voc_probe(AVProbeData *p)
27 {
28  int version, check;
29 
30  if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1))
31  return 0;
32  version = AV_RL16(p->buf + 22);
33  check = AV_RL16(p->buf + 24);
34  if (~version + 0x1234 != check)
35  return 10;
36 
37  return AVPROBE_SCORE_MAX;
38 }
39 
41 {
42  VocDecContext *voc = s->priv_data;
43  AVIOContext *pb = s->pb;
44  int header_size;
45 
46  avio_skip(pb, 20);
47  header_size = avio_rl16(pb) - 22;
48  if (header_size != 4) {
49  av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
50  return AVERROR(ENOSYS);
51  }
52  avio_skip(pb, header_size);
53 
55 
56  voc->remaining_size = 0;
57  return 0;
58 }
59 
61 {
62  if (!s->nb_streams) {
64  if (!st)
65  return AVERROR(ENOMEM);
67  }
68  return ff_voc_get_packet(s, pkt, s->streams[0], 0);
69 }
70 
72  .name = "voc",
73  .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
74  .priv_data_size = sizeof(VocDecContext),
78  .codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
79 };
Bytestream IO Context.
Definition: avio.h:104
int ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
Definition: voc_packet.c:24
static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vocdec.c:60
AVInputFormat ff_voc_demuxer
Definition: vocdec.c:71
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
#define AV_RL16
Definition: intreadwrite.h:42
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:989
Format I/O context.
Definition: avformat.h:940
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:919
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2648
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1008
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3479
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:400
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:996
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:286
static int voc_probe(AVProbeData *p)
Definition: vocdec.c:26
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:546
Stream structure.
Definition: avformat.h:705
NULL
Definition: eval.c:55
const AVCodecTag ff_voc_codec_tags[]
Definition: voc.c:27
version
Definition: ffv1enc.c:1091
AVIOContext * pb
I/O context.
Definition: avformat.h:982
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
This structure contains the data a format has to probe a file.
Definition: avformat.h:398
const unsigned char ff_voc_magic[21]
Definition: voc.c:25
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:407
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:649
void * priv_data
Format private data.
Definition: avformat.h:968
int64_t remaining_size
Definition: voc.h:29
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:529
AVCodecParameters * codecpar
Definition: avformat.h:831
static int voc_read_header(AVFormatContext *s)
Definition: vocdec.c:40
This structure stores compressed data.
Definition: avcodec.h:1323
#define check(x, y, S, v)