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72 lines
2.2 KiB
72 lines
2.2 KiB
/* |
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* Raw FLAC demuxer |
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* Copyright (c) 2001 Fabrice Bellard |
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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 "avformat.h" |
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#include "raw.h" |
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#include "id3v2.h" |
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static int flac_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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uint8_t buf[ID3v2_HEADER_SIZE]; |
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int ret; |
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AVStream *st = av_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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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->need_parsing = AVSTREAM_PARSE_FULL; |
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/* the parameters will be extracted from the compressed bitstream */ |
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/* skip ID3v2 header if found */ |
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ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE); |
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if (ret == ID3v2_HEADER_SIZE && ff_id3v2_match(buf)) { |
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int len = ff_id3v2_tag_len(buf); |
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url_fseek(s->pb, len - ID3v2_HEADER_SIZE, SEEK_CUR); |
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} else { |
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url_fseek(s->pb, 0, SEEK_SET); |
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} |
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return 0; |
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} |
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static int flac_probe(AVProbeData *p) |
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{ |
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uint8_t *bufptr = p->buf; |
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uint8_t *end = p->buf + p->buf_size; |
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if(ff_id3v2_match(bufptr)) |
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bufptr += ff_id3v2_tag_len(bufptr); |
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if(bufptr > end-4 || memcmp(bufptr, "fLaC", 4)) return 0; |
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else return AVPROBE_SCORE_MAX/2; |
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} |
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AVInputFormat flac_demuxer = { |
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"flac", |
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NULL_IF_CONFIG_SMALL("raw FLAC"), |
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0, |
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flac_probe, |
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flac_read_header, |
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ff_raw_read_partial_packet, |
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.flags= AVFMT_GENERIC_INDEX, |
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.extensions = "flac", |
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.value = CODEC_ID_FLAC, |
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};
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