mirror of
https://github.com/librempeg/librempeg
synced 2024-11-23 11:39:47 +00:00
140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*
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* Raw DTS-HD demuxer
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "libavutil/intreadwrite.h"
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#include "libavutil/dict.h"
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#include "avformat.h"
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#define AUPR_HDR 0x415550522D484452
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#define AUPRINFO 0x41555052494E464F
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#define BITSHVTB 0x4249545348565442
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#define BLACKOUT 0x424C41434B4F5554
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#define BRANCHPT 0x4252414E43485054
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#define BUILDVER 0x4255494C44564552
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#define CORESSMD 0x434F524553534D44
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#define DTSHDHDR 0x4454534844484452
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#define EXTSS_MD 0x45585453535f4d44
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#define FILEINFO 0x46494C45494E464F
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#define NAVI_TBL 0x4E4156492D54424C
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#define STRMDATA 0x5354524D44415441
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#define TIMECODE 0x54494D45434F4445
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typedef struct DTSHDDemuxContext {
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uint64_t data_end;
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} DTSHDDemuxContext;
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static int dtshd_probe(AVProbeData *p)
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{
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if (AV_RB64(p->buf) == DTSHDHDR)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int dtshd_read_header(AVFormatContext *s)
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{
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DTSHDDemuxContext *dtshd = s->priv_data;
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AVIOContext *pb = s->pb;
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uint64_t chunk_type, chunk_size;
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AVStream *st;
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int ret;
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char *value;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = AV_CODEC_ID_DTS;
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st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
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while (!url_feof(pb)) {
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chunk_type = avio_rb64(pb);
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chunk_size = avio_rb64(pb);
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if (chunk_size < 4) {
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av_log(s, AV_LOG_ERROR, "chunk size too small\n");
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return AVERROR_INVALIDDATA;
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}
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if (chunk_size > ((uint64_t)1 << 61)) {
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av_log(s, AV_LOG_ERROR, "chunk size too big\n");
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return AVERROR_INVALIDDATA;
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}
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switch (chunk_type) {
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case STRMDATA:
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dtshd->data_end = chunk_size + avio_tell(pb);
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if (dtshd->data_end <= chunk_size)
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return AVERROR_INVALIDDATA;
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return 0;
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break;
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case FILEINFO:
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if (chunk_size > INT_MAX)
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goto skip;
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value = av_malloc(chunk_size);
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if (!value)
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goto skip;
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avio_read(pb, value, chunk_size);
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value[chunk_size - 1] = 0;
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av_dict_set(&s->metadata, "fileinfo", value,
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AV_DICT_DONT_STRDUP_VAL);
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break;
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default:
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skip:
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ret = avio_skip(pb, chunk_size);
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if (ret < 0)
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return ret;
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};
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}
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return AVERROR_EOF;
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}
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static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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DTSHDDemuxContext *dtshd = s->priv_data;
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int64_t size, left;
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int ret;
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left = dtshd->data_end - avio_tell(s->pb);
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size = FFMIN(left, 1024);
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if (size <= 0)
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return AVERROR_EOF;
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ret = av_get_packet(s->pb, pkt, size);
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if (ret < 0)
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return ret;
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pkt->stream_index = 0;
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return ret;
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}
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AVInputFormat ff_dtshd_demuxer = {
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.name = "dtshd",
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.long_name = NULL_IF_CONFIG_SMALL("raw DTS-HD"),
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.priv_data_size = sizeof(DTSHDDemuxContext),
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.read_probe = dtshd_probe,
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.read_header = dtshd_read_header,
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.read_packet = raw_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "dtshd",
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.raw_codec_id = AV_CODEC_ID_DTS,
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};
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