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