/* * Copyright (C) 2005 Matthieu CASTET * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdlib.h> #include "libavcodec/get_bits.h" #include "libavcodec/flac.h" #include "avformat.h" #include "internal.h" #include "oggdec.h" #define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F static int flac_header (AVFormatContext * s, int idx) { struct ogg *ogg = s->priv_data; struct ogg_stream *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); skip_bits1(&gb); /* metadata_last */ mdt = get_bits(&gb, 7); if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) { uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4; uint32_t samplerate; skip_bits_long(&gb, 4*8); /* "FLAC" */ if(get_bits(&gb, 8) != 1) /* unsupported major version */ return -1; skip_bits_long(&gb, 8 + 16); /* minor version + header count */ skip_bits_long(&gb, 4*8); /* "fLaC" */ /* METADATA_BLOCK_HEADER */ if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE) return -1; st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_FLAC; st->need_parsing = AVSTREAM_PARSE_HEADERS; if (ff_alloc_extradata(st->codecpar, FLAC_STREAMINFO_SIZE) < 0) return AVERROR(ENOMEM); memcpy(st->codecpar->extradata, streaminfo_start, st->codecpar->extradata_size); samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4; if (!samplerate) return AVERROR_INVALIDDATA; avpriv_set_pts_info(st, 64, 1, samplerate); } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) { ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4); } return 1; } static int old_flac_header (AVFormatContext * s, int idx) { struct ogg *ogg = s->priv_data; AVStream *st = s->streams[idx]; struct ogg_stream *os = ogg->streams + idx; AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC); AVCodecContext *avctx; int size, ret; uint8_t *data; if (!parser) return -1; st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_FLAC; avctx = avcodec_alloc_context3(NULL); if (!avctx) { ret = AVERROR(ENOMEM); goto fail; } ret = avcodec_parameters_to_context(avctx, st->codecpar); if (ret < 0) goto fail; parser->flags = PARSER_FLAG_COMPLETE_FRAMES; av_parser_parse2(parser, avctx, &data, &size, os->buf + os->pstart, os->psize, AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1); av_parser_close(parser); if (avctx->sample_rate) { avpriv_set_pts_info(st, 64, 1, avctx->sample_rate); avcodec_free_context(&avctx); return 0; } avcodec_free_context(&avctx); return 1; fail: av_parser_close(parser); avcodec_free_context(&avctx); return ret; } const struct ogg_codec ff_flac_codec = { .magic = "\177FLAC", .magicsize = 5, .header = flac_header, .nb_header = 2, }; const struct ogg_codec ff_old_flac_codec = { .magic = "fLaC", .magicsize = 4, .header = old_flac_header, .nb_header = 0, };