PeerStreamer

/*

 *    Copyright (C) 2005  Matthieu CASTET

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include <stdlib.h>

#include "libavcodec/get_bits.h"

#include "libavcodec/flac.h"

#include "avformat.h"

#include "oggdec.h"

#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F

static int

flac_header (AVFormatContext * s, int idx)

{

    struct ogg *ogg = s->priv_data;

    struct ogg_stream *os = ogg->streams + idx;

    AVStream *st = s->streams[idx];

    GetBitContext gb;

    FLACStreaminfo si;

    int mdt;

    if (os->buf[os->pstart] == 0xff)

        return 0;

    init_get_bits(&gb, os->buf + os->pstart, os->psize*8);

    skip_bits1(&gb); /* metadata_last */

    mdt = get_bits(&gb, 7);

    if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {

        uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;

        skip_bits_long(&gb, 4*8); /* "FLAC" */

        if(get_bits(&gb, 8) != 1) /* unsupported major version */

            return -1;

        skip_bits_long(&gb, 8 + 16); /* minor version + header count */

        skip_bits_long(&gb, 4*8); /* "fLaC" */

        /* METADATA_BLOCK_HEADER */

        if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)

            return -1;

        ff_flac_parse_streaminfo(st->codec, &si, streaminfo_start);

        st->codec->codec_type = AVMEDIA_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, streaminfo_start, FLAC_STREAMINFO_SIZE);

        st->codec->extradata_size = FLAC_STREAMINFO_SIZE;

        av_set_pts_info(st, 64, 1, st->codec->sample_rate);

    } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {

        ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 4, os->psize - 4);

    }

    return 1;

}

static int

old_flac_header (AVFormatContext * s, int idx)

{

    AVStream *st = s->streams[idx];

    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

    st->codec->codec_id = CODEC_ID_FLAC;

    return 0;

}

const struct ogg_codec ff_flac_codec = {

    .magic = "\177FLAC",

    .magicsize = 5,

    .header = flac_header

};

const struct ogg_codec ff_old_flac_codec = {

    .magic = "fLaC",

    .magicsize = 4,

    .header = old_flac_header

};