1/* 2 * Copyright (C) 2005 Matthieu CASTET 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include <stdlib.h> 22#include "libavcodec/get_bits.h" 23#include "libavcodec/flac.h" 24#include "avformat.h" 25#include "internal.h" 26#include "oggdec.h" 27 28#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F 29 30static int 31flac_header (AVFormatContext * s, int idx) 32{ 33 struct ogg *ogg = s->priv_data; 34 struct ogg_stream *os = ogg->streams + idx; 35 AVStream *st = s->streams[idx]; 36 GetBitContext gb; 37 FLACStreaminfo si; 38 int mdt; 39 40 if (os->buf[os->pstart] == 0xff) 41 return 0; 42 43 init_get_bits(&gb, os->buf + os->pstart, os->psize*8); 44 skip_bits1(&gb); /* metadata_last */ 45 mdt = get_bits(&gb, 7); 46 47 if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) { 48 uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4; 49 skip_bits_long(&gb, 4*8); /* "FLAC" */ 50 if(get_bits(&gb, 8) != 1) /* unsupported major version */ 51 return -1; 52 skip_bits_long(&gb, 8 + 16); /* minor version + header count */ 53 skip_bits_long(&gb, 4*8); /* "fLaC" */ 54 55 /* METADATA_BLOCK_HEADER */ 56 if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE) 57 return -1; 58 59 avpriv_flac_parse_streaminfo(st->codec, &si, streaminfo_start); 60 61 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 62 st->codec->codec_id = AV_CODEC_ID_FLAC; 63 st->need_parsing = AVSTREAM_PARSE_HEADERS; 64 65 if (ff_alloc_extradata(st->codec, FLAC_STREAMINFO_SIZE) < 0) 66 return AVERROR(ENOMEM); 67 memcpy(st->codec->extradata, streaminfo_start, st->codec->extradata_size); 68 69 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); 70 } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) { 71 ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 4, os->psize - 4, 1); 72 } 73 74 return 1; 75} 76 77static int 78old_flac_header (AVFormatContext * s, int idx) 79{ 80 struct ogg *ogg = s->priv_data; 81 AVStream *st = s->streams[idx]; 82 struct ogg_stream *os = ogg->streams + idx; 83 AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC); 84 int size; 85 uint8_t *data; 86 87 if (!parser) 88 return -1; 89 90 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 91 st->codec->codec_id = AV_CODEC_ID_FLAC; 92 93 parser->flags = PARSER_FLAG_COMPLETE_FRAMES; 94 av_parser_parse2(parser, st->codec, 95 &data, &size, os->buf + os->pstart, os->psize, 96 AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1); 97 98 av_parser_close(parser); 99 100 if (st->codec->sample_rate) { 101 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); 102 return 0; 103 } 104 105 return 1; 106} 107 108const struct ogg_codec ff_flac_codec = { 109 .magic = "\177FLAC", 110 .magicsize = 5, 111 .header = flac_header, 112 .nb_header = 2, 113}; 114 115const struct ogg_codec ff_old_flac_codec = { 116 .magic = "fLaC", 117 .magicsize = 4, 118 .header = old_flac_header, 119 .nb_header = 0, 120}; 121