mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
3.0 KiB
92 lines
3.0 KiB
/* |
|
* Xiph CELT parser for Ogg |
|
* Copyright (c) 2011 Nicolas George |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#include <string.h> |
|
|
|
#include "libavutil/intreadwrite.h" |
|
#include "avformat.h" |
|
#include "internal.h" |
|
#include "oggdec.h" |
|
|
|
struct oggcelt_private { |
|
int extra_headers_left; |
|
}; |
|
|
|
static int celt_header(AVFormatContext *s, int idx) |
|
{ |
|
struct ogg *ogg = s->priv_data; |
|
struct ogg_stream *os = ogg->streams + idx; |
|
AVStream *st = s->streams[idx]; |
|
struct oggcelt_private *priv = os->private; |
|
uint8_t *p = os->buf + os->pstart; |
|
|
|
if (os->psize == 60 && |
|
!memcmp(p, ff_celt_codec.magic, ff_celt_codec.magicsize)) { |
|
/* Main header */ |
|
|
|
uint32_t version, sample_rate, nb_channels, frame_size; |
|
uint32_t overlap, extra_headers; |
|
|
|
priv = av_malloc(sizeof(struct oggcelt_private)); |
|
if (!priv) |
|
return AVERROR(ENOMEM); |
|
if (ff_alloc_extradata(st->codec, 2 * sizeof(uint32_t)) < 0) { |
|
av_free(priv); |
|
return AVERROR(ENOMEM); |
|
} |
|
version = AV_RL32(p + 28); |
|
/* unused header size field skipped */ |
|
sample_rate = AV_RL32(p + 36); |
|
nb_channels = AV_RL32(p + 40); |
|
frame_size = AV_RL32(p + 44); |
|
overlap = AV_RL32(p + 48); |
|
/* unused bytes per packet field skipped */ |
|
extra_headers = AV_RL32(p + 56); |
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
|
st->codec->codec_id = AV_CODEC_ID_CELT; |
|
st->codec->sample_rate = sample_rate; |
|
st->codec->channels = nb_channels; |
|
st->codec->frame_size = frame_size; |
|
if (sample_rate) |
|
avpriv_set_pts_info(st, 64, 1, sample_rate); |
|
priv->extra_headers_left = 1 + extra_headers; |
|
av_free(os->private); |
|
os->private = priv; |
|
AV_WL32(st->codec->extradata + 0, overlap); |
|
AV_WL32(st->codec->extradata + 4, version); |
|
return 1; |
|
} else if (priv && priv->extra_headers_left) { |
|
/* Extra headers (vorbiscomment) */ |
|
|
|
ff_vorbis_comment(s, &st->metadata, p, os->psize, 1); |
|
priv->extra_headers_left--; |
|
return 1; |
|
} else { |
|
return 0; |
|
} |
|
} |
|
|
|
const struct ogg_codec ff_celt_codec = { |
|
.magic = "CELT ", |
|
.magicsize = 8, |
|
.header = celt_header, |
|
.nb_header = 2, |
|
};
|
|
|