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