2 * Xiph CELT / Opus parser for Ogg
3 * Copyright (c) 2011 Nicolas George
5 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavutil/intreadwrite.h"
27 struct oggcelt_private {
28 int extra_headers_left;
31 static int celt_header(AVFormatContext *s, int idx)
33 struct ogg *ogg = s->priv_data;
34 struct ogg_stream *os = ogg->streams + idx;
35 AVStream *st = s->streams[idx];
36 struct oggcelt_private *priv = os->private;
37 uint8_t *p = os->buf + os->pstart;
39 if (os->psize == 60 &&
40 !memcmp(p, ff_celt_codec.magic, ff_celt_codec.magicsize)) {
44 uint32_t version, header_size, sample_rate, nb_channels, frame_size;
45 uint32_t overlap, bytes_per_packet, extra_headers;
48 extradata = av_malloc(2 * sizeof(uint32_t) +
49 FF_INPUT_BUFFER_PADDING_SIZE);
50 priv = av_malloc(sizeof(struct oggcelt_private));
51 if (!extradata || !priv) {
54 return AVERROR(ENOMEM);
56 version = AV_RL32(p + 28);
57 header_size = AV_RL32(p + 32); /* unused */
58 sample_rate = AV_RL32(p + 36);
59 nb_channels = AV_RL32(p + 40);
60 frame_size = AV_RL32(p + 44);
61 overlap = AV_RL32(p + 48);
62 bytes_per_packet = AV_RL32(p + 52); /* unused */
63 extra_headers = AV_RL32(p + 56);
64 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
65 st->codec->codec_id = CODEC_ID_CELT;
66 st->codec->sample_rate = sample_rate;
67 st->codec->channels = nb_channels;
68 st->codec->frame_size = frame_size;
69 st->codec->sample_fmt = AV_SAMPLE_FMT_S16;
70 av_set_pts_info(st, 64, 1, sample_rate);
71 priv->extra_headers_left = 1 + extra_headers;
74 AV_WL32(extradata + 0, overlap);
75 AV_WL32(extradata + 4, version);
76 av_free(st->codec->extradata);
77 st->codec->extradata = extradata;
78 st->codec->extradata_size = 2 * sizeof(uint32_t);
81 } else if(priv && priv->extra_headers_left) {
83 /* Extra headers (vorbiscomment) */
85 ff_vorbis_comment(s, &st->metadata, p, os->psize);
86 priv->extra_headers_left--;
94 const struct ogg_codec ff_celt_codec = {
97 .header = celt_header,