FFmpeg  4.3.6
oggparsecelt.c
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1 /*
2  * Xiph CELT parser for Ogg
3  * Copyright (c) 2011 Nicolas George
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <string.h>
23 
24 #include "libavutil/intreadwrite.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "oggdec.h"
28 
31 };
32 
33 static int celt_header(AVFormatContext *s, int idx)
34 {
35  struct ogg *ogg = s->priv_data;
36  struct ogg_stream *os = ogg->streams + idx;
37  AVStream *st = s->streams[idx];
38  struct oggcelt_private *priv = os->private;
39  uint8_t *p = os->buf + os->pstart;
40  int ret;
41 
42  if (os->psize == 60 &&
44  /* Main header */
45 
46  uint32_t version, sample_rate, nb_channels;
47  uint32_t overlap, extra_headers;
48 
49  priv = av_malloc(sizeof(struct oggcelt_private));
50  if (!priv)
51  return AVERROR(ENOMEM);
52  ret = ff_alloc_extradata(st->codecpar, 2 * sizeof(uint32_t));
53  if (ret < 0) {
54  av_free(priv);
55  return ret;
56  }
57  version = AV_RL32(p + 28);
58  /* unused header size field skipped */
59  sample_rate = AV_RL32(p + 36);
60  nb_channels = AV_RL32(p + 40);
61  overlap = AV_RL32(p + 48);
62  /* unused bytes per packet field skipped */
63  extra_headers = AV_RL32(p + 56);
68  if (sample_rate)
69  avpriv_set_pts_info(st, 64, 1, sample_rate);
70 
71  if (os->private) {
72  av_free(priv);
73  priv = os->private;
74  }
75  os->private = priv;
76  priv->extra_headers_left = 1 + extra_headers;
77 
78  AV_WL32(st->codecpar->extradata + 0, overlap);
79  AV_WL32(st->codecpar->extradata + 4, version);
80  return 1;
81  } else if (priv && priv->extra_headers_left) {
82  /* Extra headers (vorbiscomment) */
83 
84  ff_vorbis_stream_comment(s, st, p, os->psize);
85  priv->extra_headers_left--;
86  return 1;
87  } else {
88  return 0;
89  }
90 }
91 
92 const struct ogg_codec ff_celt_codec = {
93  .magic = "CELT ",
94  .magicsize = 8,
95  .header = celt_header,
96  .nb_header = 2,
97 };
version
Definition: libkvazaar.c:292
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition: oggdec.h:31
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4948
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
static int celt_header(AVFormatContext *s, int idx)
Definition: oggparsecelt.c:33
Format I/O context.
Definition: avformat.h:1351
unsigned int psize
Definition: oggdec.h:66
uint8_t
#define av_malloc(s)
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#define AVERROR(e)
Definition: error.h:43
int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st, const uint8_t *buf, int size)
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3328
unsigned int pstart
Definition: oggdec.h:65
struct ogg_stream * streams
Definition: oggdec.h:103
#define s(width, name)
Definition: cbs_vp9.c:257
#define AV_RL32
Definition: intreadwrite.h:146
const struct ogg_codec ff_celt_codec
Definition: oggparsecelt.c:92
Stream structure.
Definition: avformat.h:876
sample_rate
void * private
Definition: oggdec.h:91
const int8_t * magic
Definition: oggdec.h:32
int sample_rate
Audio only.
Definition: codec_par.h:170
uint8_t * buf
Definition: oggdec.h:62
Main libavformat public API header.
#define av_free(p)
Definition: oggdec.h:102
void * priv_data
Format private data.
Definition: avformat.h:1379
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
uint8_t magicsize
Definition: oggdec.h:33
int channels
Audio only.
Definition: codec_par.h:166
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int nb_channels
#define AV_WL32(p, v)
Definition: intreadwrite.h:426