From 81f052cb7dc3f6c6b8192436dbbaff6d1f2bf676 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Sat, 28 Feb 2009 17:24:46 +0000 Subject: Separate the raw FLAC demuxer from raw.c and put in a new file, flacdec.c. Originally committed as revision 17660 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/flacdec.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 libavformat/flacdec.c (limited to 'libavformat/flacdec.c') diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c new file mode 100644 index 0000000000..94d916a728 --- /dev/null +++ b/libavformat/flacdec.c @@ -0,0 +1,72 @@ +/* + * 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, +}; -- cgit v1.2.3