blob: 6d567f988a307a7e0cd01c0cd5e67b3e1b38b98d
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 | |
29 | struct oggcelt_private { |
30 | int extra_headers_left; |
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 | |
41 | if (os->psize == 60 && |
42 | !memcmp(p, ff_celt_codec.magic, ff_celt_codec.magicsize)) { |
43 | /* Main header */ |
44 | |
45 | uint32_t version, sample_rate, nb_channels; |
46 | uint32_t overlap, extra_headers; |
47 | |
48 | priv = av_malloc(sizeof(struct oggcelt_private)); |
49 | if (!priv) |
50 | return AVERROR(ENOMEM); |
51 | if (ff_alloc_extradata(st->codecpar, 2 * sizeof(uint32_t)) < 0) { |
52 | av_free(priv); |
53 | return AVERROR(ENOMEM); |
54 | } |
55 | version = AV_RL32(p + 28); |
56 | /* unused header size field skipped */ |
57 | sample_rate = AV_RL32(p + 36); |
58 | nb_channels = AV_RL32(p + 40); |
59 | overlap = AV_RL32(p + 48); |
60 | /* unused bytes per packet field skipped */ |
61 | extra_headers = AV_RL32(p + 56); |
62 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
63 | st->codecpar->codec_id = AV_CODEC_ID_CELT; |
64 | st->codecpar->sample_rate = sample_rate; |
65 | st->codecpar->channels = nb_channels; |
66 | if (sample_rate) |
67 | avpriv_set_pts_info(st, 64, 1, sample_rate); |
68 | priv->extra_headers_left = 1 + extra_headers; |
69 | av_free(os->private); |
70 | os->private = priv; |
71 | AV_WL32(st->codecpar->extradata + 0, overlap); |
72 | AV_WL32(st->codecpar->extradata + 4, version); |
73 | return 1; |
74 | } else if (priv && priv->extra_headers_left) { |
75 | /* Extra headers (vorbiscomment) */ |
76 | |
77 | ff_vorbis_stream_comment(s, st, p, os->psize); |
78 | priv->extra_headers_left--; |
79 | return 1; |
80 | } else { |
81 | return 0; |
82 | } |
83 | } |
84 | |
85 | const struct ogg_codec ff_celt_codec = { |
86 | .magic = "CELT ", |
87 | .magicsize = 8, |
88 | .header = celt_header, |
89 | .nb_header = 2, |
90 | }; |
91 |