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https://git.ffmpeg.org/ffmpeg.git
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73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/*
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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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