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ffmpeg / libavformat / oggparseflac.c @ 01f4895c

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/*
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 *    Copyright (C) 2005  Matthieu CASTET
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 * 
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 * This library 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 of the License, or (at your option) any later version.
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 *
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 * This library 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 this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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#include <stdlib.h>
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#include "avformat.h"
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#include "bitstream.h"
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#include "ogg2.h"
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#define FLAC_STREAMINFO_SIZE 0x22
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static int
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flac_header (AVFormatContext * s, int idx)
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{
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    ogg_t *ogg = s->priv_data;
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    ogg_stream_t *os = ogg->streams + idx;
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    AVStream *st = s->streams[idx];
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    GetBitContext gb;
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    int mdt;
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    if (os->buf[os->pstart] == 0xff)
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        return 0;
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    init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
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    get_bits(&gb, 1); /* metadata_last */
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    mdt = get_bits(&gb, 7);
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    if (mdt == 0x7f) {
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        skip_bits(&gb, 4*8); /* "FLAC" */
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        if(get_bits(&gb, 8) != 1) /* unsupported major version */
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            return -1;
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        skip_bits(&gb, 8 + 16);      /* minor version + header count */
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        skip_bits(&gb, 4*8); /* "fLaC" */
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        /* METADATA_BLOCK_HEADER */
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        if (get_bits(&gb, 32) != FLAC_STREAMINFO_SIZE)
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            return -1;
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        skip_bits(&gb, 16*2+24*2);
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        st->codec->sample_rate = get_bits_long(&gb, 20);
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        st->codec->channels = get_bits(&gb, 3) + 1;
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        st->codec->codec_type = CODEC_TYPE_AUDIO;
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        st->codec->codec_id = CODEC_ID_FLAC;
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        st->codec->extradata =
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            av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
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        memcpy (st->codec->extradata, os->buf + os->pstart + 5 + 4 + 4 + 4,
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                FLAC_STREAMINFO_SIZE);
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        st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
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    } else if (mdt == 4) {
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        vorbis_comment (s, os->buf + os->pstart + 4, os->psize - 4);
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    }
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    return 1;
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}
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ogg_codec_t flac_codec = {
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    .magic = "\177FLAC",
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    .magicsize = 5,
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    .header = flac_header
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};