/* *    Copyright (C) 2005  Matthieu CASTET * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */#include <stdlib.h>#include "avformat.h"#include "bitstream.h"#include "ogg2.h"#define FLAC_STREAMINFO_SIZE 0x22static intflac_header (AVFormatContext * s, int idx){    ogg_t *ogg = s->priv_data;    ogg_stream_t *os = ogg->streams + idx;    AVStream *st = s->streams[idx];    GetBitContext gb;    int mdt;    if (os->buf[os->pstart] == 0xff)        return 0;    init_get_bits(&gb, os->buf + os->pstart, os->psize*8);    get_bits(&gb, 1); /* metadata_last */    mdt = get_bits(&gb, 7);    if (mdt == 0x7f) {        skip_bits(&gb, 4*8); /* "FLAC" */        if(get_bits(&gb, 8) != 1) /* unsupported major version */            return -1;        skip_bits(&gb, 8 + 16);      /* minor version + header count */        skip_bits(&gb, 4*8); /* "fLaC" */        /* METADATA_BLOCK_HEADER */        if (get_bits(&gb, 32) != FLAC_STREAMINFO_SIZE)            return -1;        skip_bits(&gb, 16*2+24*2);        st->codec->sample_rate = get_bits_long(&gb, 20);        st->codec->channels = get_bits(&gb, 3) + 1;        st->codec->codec_type = CODEC_TYPE_AUDIO;        st->codec->codec_id = CODEC_ID_FLAC;        st->codec->extradata =            av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);        memcpy (st->codec->extradata, os->buf + os->pstart + 5 + 4 + 4 + 4,                FLAC_STREAMINFO_SIZE);        st->codec->extradata_size = FLAC_STREAMINFO_SIZE;    } else if (mdt == 4) {        vorbis_comment (s, os->buf + os->pstart + 4, os->psize - 4);    }    return 1;}ogg_codec_t flac_codec = {    .magic = "\177FLAC",    .magicsize = 5,    .header = flac_header};