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7784f47762
The only parameters needed by the demuxers are the sample rate and sample count, which can be trivially extracted manually, without resorting to an avpriv function.
104 lines
3.1 KiB
C
104 lines
3.1 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 "internal.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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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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uint32_t samplerate;
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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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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = AV_CODEC_ID_FLAC;
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st->need_parsing = AVSTREAM_PARSE_HEADERS;
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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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samplerate = AV_RB24(st->codec->extradata + 10) >> 4;
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if (!samplerate)
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return AVERROR_INVALIDDATA;
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avpriv_set_pts_info(st, 64, 1, samplerate);
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} else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
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ff_vorbis_stream_comment(s, st, 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 = AV_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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.nb_header = 2,
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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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.nb_header = 0,
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};
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