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https://github.com/FFmpeg/FFmpeg.git
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d9cca9fc6a
Specifically, ff_flac_parse_streaminfo, ff_flac_is_extradata_valid and ff_flac_parse_block_header
97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/*
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* Copyright (C) 2005 Matthieu CASTET
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 <stdlib.h>
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#include "libavcodec/get_bits.h"
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "oggdec.h"
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#define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F
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static int
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flac_header (AVFormatContext * s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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AVStream *st = s->streams[idx];
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GetBitContext gb;
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FLACStreaminfo si;
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int mdt;
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if (os->buf[os->pstart] == 0xff)
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return 0;
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init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
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skip_bits1(&gb); /* metadata_last */
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mdt = get_bits(&gb, 7);
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if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
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uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;
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skip_bits_long(&gb, 4*8); /* "FLAC" */
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if(get_bits(&gb, 8) != 1) /* unsupported major version */
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return -1;
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skip_bits_long(&gb, 8 + 16); /* minor version + header count */
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skip_bits_long(&gb, 4*8); /* "fLaC" */
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/* METADATA_BLOCK_HEADER */
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if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)
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return -1;
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avpriv_flac_parse_streaminfo(st->codec, &si, streaminfo_start);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_FLAC;
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st->codec->extradata =
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av_malloc(FLAC_STREAMINFO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(st->codec->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE);
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st->codec->extradata_size = FLAC_STREAMINFO_SIZE;
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av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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} else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
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ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 4, os->psize - 4);
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}
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return 1;
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}
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static int
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old_flac_header (AVFormatContext * s, int idx)
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{
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AVStream *st = s->streams[idx];
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_FLAC;
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return 0;
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}
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const struct ogg_codec ff_flac_codec = {
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.magic = "\177FLAC",
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.magicsize = 5,
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.header = flac_header
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};
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const struct ogg_codec ff_old_flac_codec = {
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.magic = "fLaC",
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.magicsize = 4,
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.header = old_flac_header
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};
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