From 4ca59d19485afce923c6f1d8ccef980011b76f50 Mon Sep 17 00:00:00 2001 From: Nicolas George Date: Mon, 26 Sep 2011 13:19:05 +0200 Subject: oggdec: add support for Xiph's CELT codec This patch also introduces CODEC_ID_CELT. Signed-off-by: Nicolas George Signed-off-by: Diego Biurrun --- libavformat/oggparsecelt.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 libavformat/oggparsecelt.c (limited to 'libavformat/oggparsecelt.c') diff --git a/libavformat/oggparsecelt.c b/libavformat/oggparsecelt.c new file mode 100644 index 0000000000..82a842c612 --- /dev/null +++ b/libavformat/oggparsecelt.c @@ -0,0 +1,96 @@ +/* + * Xiph CELT / Opus parser for Ogg + * Copyright (c) 2011 Nicolas George + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include + +#include "libavutil/intreadwrite.h" +#include "avformat.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; + 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); + /* 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); + 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, +}; -- cgit v1.2.3