| 1 | /*
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| 2 | * Copyright (C) 2005 Matthieu CASTET
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| 3 | *
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| 4 | * This library is free software; you can redistribute it and/or
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| 5 | * modify it under the terms of the GNU Lesser General Public
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| 6 | * License as published by the Free Software Foundation; either
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| 7 | * version 2 of the License, or (at your option) any later version.
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| 8 | *
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| 9 | * This library is distributed in the hope that it will be useful,
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 12 | * Lesser General Public License for more details.
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| 13 | *
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| 14 | * You should have received a copy of the GNU Lesser General Public
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| 15 | * License along with this library; if not, write to the Free Software
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| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 17 | */
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| 18 |
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| 19 | #include <stdlib.h>
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| 20 | #include "avformat.h"
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| 21 | #include "bitstream.h"
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| 22 | #include "ogg2.h"
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| 23 |
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| 24 | #define FLAC_STREAMINFO_SIZE 0x22
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| 25 |
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| 26 | static int
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| 27 | flac_header (AVFormatContext * s, int idx)
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| 28 | {
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| 29 | ogg_t *ogg = s->priv_data;
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| 30 | ogg_stream_t *os = ogg->streams + idx;
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| 31 | AVStream *st = s->streams[idx];
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| 32 | GetBitContext gb;
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| 33 | int mdt;
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| 34 |
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| 35 | if (os->buf[os->pstart] == 0xff)
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| 36 | return 0;
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| 37 |
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| 38 | init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
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| 39 | get_bits(&gb, 1); /* metadata_last */
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| 40 | mdt = get_bits(&gb, 7);
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| 41 |
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| 42 | if (mdt == 0x7f) {
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| 43 | skip_bits(&gb, 4*8); /* "FLAC" */
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| 44 | if(get_bits(&gb, 8) != 1) /* unsupported major version */
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| 45 | return -1;
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| 46 | skip_bits(&gb, 8 + 16); /* minor version + header count */
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| 47 | skip_bits(&gb, 4*8); /* "fLaC" */
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| 48 |
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| 49 | /* METADATA_BLOCK_HEADER */
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| 50 | if (get_bits(&gb, 32) != FLAC_STREAMINFO_SIZE)
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| 51 | return -1;
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| 52 |
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| 53 | skip_bits(&gb, 16*2+24*2);
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| 54 |
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| 55 | st->codec->sample_rate = get_bits_long(&gb, 20);
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| 56 | st->codec->channels = get_bits(&gb, 3) + 1;
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| 57 |
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| 58 | st->codec->codec_type = CODEC_TYPE_AUDIO;
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| 59 | st->codec->codec_id = CODEC_ID_FLAC;
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| 60 |
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| 61 | st->codec->extradata =
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| 62 | av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
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| 63 | memcpy (st->codec->extradata, os->buf + os->pstart + 5 + 4 + 4 + 4,
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| 64 | FLAC_STREAMINFO_SIZE);
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| 65 | st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
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| 66 |
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| 67 | st->time_base.num = 1;
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| 68 | st->time_base.den = st->codec->sample_rate;
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| 69 | } else if (mdt == 4) {
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| 70 | vorbis_comment (s, os->buf + os->pstart + 4, os->psize - 4);
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| 71 | }
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| 72 |
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| 73 | return 1;
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| 74 | }
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| 75 |
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| 76 | ogg_codec_t flac_codec = {
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| 77 | .magic = "\177FLAC",
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| 78 | .magicsize = 5,
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| 79 | .header = flac_header
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| 80 | };
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