/* * Copyright (C) 2005 Matthieu CASTET * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <stdlib.h> #include "avformat.h" #include "bitstream.h" #include "ogg2.h" #define FLAC_STREAMINFO_SIZE 0x22 static int flac_header (AVFormatContext * s, int idx) { ogg_t *ogg = s->priv_data; ogg_stream_t *os = ogg->streams + idx; AVStream *st = s->streams[idx]; GetBitContext gb; int mdt; if (os->buf[os->pstart] == 0xff) return 0; init_get_bits(&gb, os->buf + os->pstart, os->psize*8); get_bits(&gb, 1); /* metadata_last */ mdt = get_bits(&gb, 7); if (mdt == 0x7f) { skip_bits(&gb, 4*8); /* "FLAC" */ if(get_bits(&gb, 8) != 1) /* unsupported major version */ return -1; skip_bits(&gb, 8 + 16); /* minor version + header count */ skip_bits(&gb, 4*8); /* "fLaC" */ /* METADATA_BLOCK_HEADER */ if (get_bits(&gb, 32) != FLAC_STREAMINFO_SIZE) return -1; skip_bits(&gb, 16*2+24*2); st->codec->sample_rate = get_bits_long(&gb, 20); st->codec->channels = get_bits(&gb, 3) + 1; st->codec->codec_type = CODEC_TYPE_AUDIO; st->codec->codec_id = CODEC_ID_FLAC; st->codec->extradata = av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); memcpy (st->codec->extradata, os->buf + os->pstart + 5 + 4 + 4 + 4, FLAC_STREAMINFO_SIZE); st->codec->extradata_size = FLAC_STREAMINFO_SIZE; } else if (mdt == 4) { vorbis_comment (s, os->buf + os->pstart + 4, os->psize - 4); } return 1; } ogg_codec_t flac_codec = { .magic = "\177FLAC", .magicsize = 5, .header = flac_header };