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98 lines
2.8 KiB
98 lines
2.8 KiB
/* |
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* Copyright (C) 2005 Matthieu CASTET |
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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 <stdlib.h> |
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#include "libavcodec/bitstream.h" |
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#include "avformat.h" |
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#include "oggdec.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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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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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_long(&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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st->time_base.num = 1; |
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st->time_base.den = st->codec->sample_rate; |
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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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static int |
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old_flac_header (AVFormatContext * s, int idx) |
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{ |
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AVStream *st = s->streams[idx]; |
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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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return 0; |
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} |
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const struct ogg_codec ff_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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}; |
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const struct ogg_codec ff_old_flac_codec = { |
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.magic = "fLaC", |
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.magicsize = 4, |
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.header = old_flac_header |
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};
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