yading@11: /*
yading@11:  * Xiph CELT parser for Ogg
yading@11:  * Copyright (c) 2011 Nicolas George
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include <string.h>
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "oggdec.h"
yading@11: 
yading@11: struct oggcelt_private {
yading@11:     int extra_headers_left;
yading@11: };
yading@11: 
yading@11: static int celt_header(AVFormatContext *s, int idx)
yading@11: {
yading@11:     struct ogg *ogg = s->priv_data;
yading@11:     struct ogg_stream *os = ogg->streams + idx;
yading@11:     AVStream *st = s->streams[idx];
yading@11:     struct oggcelt_private *priv = os->private;
yading@11:     uint8_t *p = os->buf + os->pstart;
yading@11: 
yading@11:     if (os->psize == 60 &&
yading@11:         !memcmp(p, ff_celt_codec.magic, ff_celt_codec.magicsize)) {
yading@11:         /* Main header */
yading@11: 
yading@11:         uint32_t version, sample_rate, nb_channels, frame_size;
yading@11:         uint32_t overlap, extra_headers;
yading@11:         uint8_t *extradata;
yading@11: 
yading@11:         extradata = av_malloc(2 * sizeof(uint32_t) +
yading@11:                               FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:         priv = av_malloc(sizeof(struct oggcelt_private));
yading@11:         if (!extradata || !priv) {
yading@11:             av_free(extradata);
yading@11:             av_free(priv);
yading@11:             return AVERROR(ENOMEM);
yading@11:         }
yading@11:         version          = AV_RL32(p + 28);
yading@11:         /* unused header size field skipped */
yading@11:         sample_rate      = AV_RL32(p + 36);
yading@11:         nb_channels      = AV_RL32(p + 40);
yading@11:         frame_size       = AV_RL32(p + 44);
yading@11:         overlap          = AV_RL32(p + 48);
yading@11:         /* unused bytes per packet field skipped */
yading@11:         extra_headers    = AV_RL32(p + 56);
yading@11:         st->codec->codec_type     = AVMEDIA_TYPE_AUDIO;
yading@11:         st->codec->codec_id       = AV_CODEC_ID_CELT;
yading@11:         st->codec->sample_rate    = sample_rate;
yading@11:         st->codec->channels       = nb_channels;
yading@11:         st->codec->frame_size     = frame_size;
yading@11:         av_free(st->codec->extradata);
yading@11:         st->codec->extradata      = extradata;
yading@11:         st->codec->extradata_size = 2 * sizeof(uint32_t);
yading@11:         if (sample_rate)
yading@11:             avpriv_set_pts_info(st, 64, 1, sample_rate);
yading@11:         priv->extra_headers_left  = 1 + extra_headers;
yading@11:         av_free(os->private);
yading@11:         os->private = priv;
yading@11:         AV_WL32(extradata + 0, overlap);
yading@11:         AV_WL32(extradata + 4, version);
yading@11:         return 1;
yading@11:     } else if (priv && priv->extra_headers_left) {
yading@11:         /* Extra headers (vorbiscomment) */
yading@11: 
yading@11:         ff_vorbis_comment(s, &st->metadata, p, os->psize);
yading@11:         priv->extra_headers_left--;
yading@11:         return 1;
yading@11:     } else {
yading@11:         return 0;
yading@11:     }
yading@11: }
yading@11: 
yading@11: const struct ogg_codec ff_celt_codec = {
yading@11:     .magic     = "CELT    ",
yading@11:     .magicsize = 8,
yading@11:     .header    = celt_header,
yading@11:     .nb_header = 2,
yading@11: };