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105 lines
3.1 KiB
105 lines
3.1 KiB
/* |
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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/bitstream.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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BitstreamContext bc; |
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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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bitstream_init8(&bc, os->buf + os->pstart, os->psize); |
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bitstream_skip(&bc, 1); /* metadata_last */ |
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mdt = bitstream_read(&bc, 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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bitstream_skip(&bc, 4 * 8); /* "FLAC" */ |
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if (bitstream_read(&bc, 8) != 1) /* unsupported major version */ |
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return -1; |
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bitstream_skip(&bc, 8 + 16); /* minor version + header count */ |
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bitstream_skip(&bc, 4 * 8); /* "fLaC" */ |
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/* METADATA_BLOCK_HEADER */ |
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if (bitstream_read(&bc, 32) != FLAC_STREAMINFO_SIZE) |
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return -1; |
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->codec_id = AV_CODEC_ID_FLAC; |
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st->need_parsing = AVSTREAM_PARSE_HEADERS; |
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st->codecpar->extradata = |
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av_malloc(FLAC_STREAMINFO_SIZE + AV_INPUT_BUFFER_PADDING_SIZE); |
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memcpy(st->codecpar->extradata, streaminfo_start, FLAC_STREAMINFO_SIZE); |
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st->codecpar->extradata_size = FLAC_STREAMINFO_SIZE; |
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samplerate = AV_RB24(st->codecpar->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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->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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