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90 lines
2.9 KiB
90 lines
2.9 KiB
/* |
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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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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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if (ff_alloc_extradata(st->codec, 2 * sizeof(uint32_t)) < 0) { |
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av_free(priv); |
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return AVERROR(ENOMEM); |
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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->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = AV_CODEC_ID_CELT; |
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st->codec->sample_rate = sample_rate; |
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st->codec->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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priv->extra_headers_left = 1 + extra_headers; |
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av_free(os->private); |
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os->private = priv; |
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AV_WL32(st->codec->extradata + 0, overlap); |
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AV_WL32(st->codec->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_comment(s, &st->metadata, p, os->psize, 1); |
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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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