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Ogg: add support for Xiph's CELT (Opus) codec.

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This patch also introduces CODEC_ID_CELT.

Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
This commit is contained in:
Nicolas George 2011-04-15 19:18:04 +02:00
parent 484a330890
commit e61b83d29e
6 changed files with 105 additions and 1 deletions
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1
libavcodec/avcodec.h
View File

@ -342,6 +342,7 @@ enum CodecID {
CODEC_ID_BINKAUDIO_DCT,
CODEC_ID_AAC_LATM,
CODEC_ID_QDMC,
CODEC_ID_CELT,
/* subtitle codecs */
CODEC_ID_DVD_SUBTITLE= 0x17000,

1
libavformat/Makefile
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@ -164,6 +164,7 @@ OBJS-$(CONFIG_NUT_DEMUXER) += nutdec.o nut.o riff.o
OBJS-$(CONFIG_NUT_MUXER) += nutenc.o nut.o riff.o
OBJS-$(CONFIG_NUV_DEMUXER) += nuv.o riff.o
OBJS-$(CONFIG_OGG_DEMUXER) += oggdec.o \
oggparsecelt.o \
oggparsedirac.o \
oggparseflac.o \
oggparseogm.o \

1
libavformat/oggdec.c
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@ -45,6 +45,7 @@ static const struct ogg_codec * const ogg_codecs[] = {
&ff_vorbis_codec,
&ff_theora_codec,
&ff_flac_codec,
&ff_celt_codec,
&ff_old_dirac_codec,
&ff_old_flac_codec,
&ff_ogm_video_codec,

1
libavformat/oggdec.h
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@ -98,6 +98,7 @@ struct ogg {
#define OGG_FLAG_BOS 2
#define OGG_FLAG_EOS 4
extern const struct ogg_codec ff_celt_codec;
extern const struct ogg_codec ff_dirac_codec;
extern const struct ogg_codec ff_flac_codec;
extern const struct ogg_codec ff_ogm_audio_codec;

99
libavformat/oggparsecelt.c Normal file
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@ -0,0 +1,99 @@
/*
* Xiph CELT / Opus 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 "avformat.h"
#include "oggdec.h"
#include "libavutil/intreadwrite.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, header_size, sample_rate, nb_channels, frame_size;
uint32_t overlap, bytes_per_packet, extra_headers;
uint8_t *extradata;
extradata = av_malloc(2 * sizeof(uint32_t) +
FF_INPUT_BUFFER_PADDING_SIZE);
priv = av_malloc(sizeof(struct oggcelt_private));
if (!extradata || !priv) {
av_free(extradata);
av_free(priv);
return AVERROR(ENOMEM);
}
version = AV_RL32(p + 28);
header_size = AV_RL32(p + 32); /* unused */
sample_rate = AV_RL32(p + 36);
nb_channels = AV_RL32(p + 40);
frame_size = AV_RL32(p + 44);
overlap = AV_RL32(p + 48);
bytes_per_packet = AV_RL32(p + 52); /* unused */
extra_headers = AV_RL32(p + 56);
av_free(os->private);
av_free(st->codec->extradata);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_CELT;
st->codec->sample_rate = sample_rate;
st->codec->channels = nb_channels;
st->codec->frame_size = frame_size;
st->codec->sample_fmt = AV_SAMPLE_FMT_S16;
st->codec->extradata = extradata;
st->codec->extradata_size = 2 * sizeof(uint32_t);
if (sample_rate)
av_set_pts_info(st, 64, 1, sample_rate);
priv->extra_headers_left = 1 + extra_headers;
os->private = priv;
AV_WL32(extradata + 0, overlap);
AV_WL32(extradata + 4, version);
return 1;
} else if(priv && priv->extra_headers_left) {
/* Extra headers (vorbiscomment) */
ff_vorbis_comment(s, &st->metadata, 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,
};

3
libavformat/utils.c
View File

@ -2084,7 +2084,8 @@ static int has_codec_parameters(AVCodecContext *enc)
enc->codec_id == CODEC_ID_MP1 ||
enc->codec_id == CODEC_ID_MP2 ||
enc->codec_id == CODEC_ID_MP3 ||
enc->codec_id == CODEC_ID_SPEEX))
enc->codec_id == CODEC_ID_SPEEX ||
enc->codec_id == CODEC_ID_CELT))
return 0;
break;
case AVMEDIA_TYPE_VIDEO: