mirror of https://git.ffmpeg.org/ffmpeg.git
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/*
|
|
* 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 "libavutil/mem.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;
|
|
int ret;
|
|
|
|
if (os->psize == 60 &&
|
|
!memcmp(p, ff_celt_codec.magic, ff_celt_codec.magicsize)) {
|
|
/* Main header */
|
|
|
|
uint32_t version, sample_rate, nb_channels;
|
|
uint32_t overlap, extra_headers;
|
|
|
|
priv = av_malloc(sizeof(struct oggcelt_private));
|
|
if (!priv)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_alloc_extradata(st->codecpar, 2 * sizeof(uint32_t));
|
|
if (ret < 0) {
|
|
av_free(priv);
|
|
return ret;
|
|
}
|
|
version = AV_RL32(p + 28);
|
|
/* unused header size field skipped */
|
|
sample_rate = AV_RL32(p + 36);
|
|
nb_channels = AV_RL32(p + 40);
|
|
overlap = AV_RL32(p + 48);
|
|
/* unused bytes per packet field skipped */
|
|
extra_headers = AV_RL32(p + 56);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_CELT;
|
|
st->codecpar->sample_rate = sample_rate;
|
|
st->codecpar->ch_layout.nb_channels = nb_channels;
|
|
if (sample_rate)
|
|
avpriv_set_pts_info(st, 64, 1, sample_rate);
|
|
|
|
if (os->private) {
|
|
av_free(priv);
|
|
priv = os->private;
|
|
}
|
|
os->private = priv;
|
|
priv->extra_headers_left = 1 + extra_headers;
|
|
|
|
AV_WL32(st->codecpar->extradata + 0, overlap);
|
|
AV_WL32(st->codecpar->extradata + 4, version);
|
|
return 1;
|
|
} else if (priv && priv->extra_headers_left) {
|
|
/* Extra headers (vorbiscomment) */
|
|
|
|
ff_vorbis_stream_comment(s, st, p, os->psize);
|
|
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,
|
|
};
|