yading@11: /*
yading@11:  * Raw DTS-HD demuxer
yading@11:  * Copyright (c) 2012 Paul B Mahol
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "avformat.h"
yading@11: 
yading@11: #define AUPR_HDR 0x415550522D484452
yading@11: #define AUPRINFO 0x41555052494E464F
yading@11: #define BITSHVTB 0x4249545348565442
yading@11: #define BLACKOUT 0x424C41434B4F5554
yading@11: #define BRANCHPT 0x4252414E43485054
yading@11: #define BUILDVER 0x4255494C44564552
yading@11: #define CORESSMD 0x434F524553534D44
yading@11: #define DTSHDHDR 0x4454534844484452
yading@11: #define EXTSS_MD 0x45585453535f4d44
yading@11: #define FILEINFO 0x46494C45494E464F
yading@11: #define NAVI_TBL 0x4E4156492D54424C
yading@11: #define STRMDATA 0x5354524D44415441
yading@11: #define TIMECODE 0x54494D45434F4445
yading@11: 
yading@11: typedef struct DTSHDDemuxContext {
yading@11:     uint64_t    data_end;
yading@11: } DTSHDDemuxContext;
yading@11: 
yading@11: static int dtshd_probe(AVProbeData *p)
yading@11: {
yading@11:     if (AV_RB64(p->buf) == DTSHDHDR)
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int dtshd_read_header(AVFormatContext *s)
yading@11: {
yading@11:     DTSHDDemuxContext *dtshd = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint64_t chunk_type, chunk_size;
yading@11:     AVStream *st;
yading@11:     int ret;
yading@11:     char *value;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_id   = AV_CODEC_ID_DTS;
yading@11:     st->need_parsing      = AVSTREAM_PARSE_FULL_RAW;
yading@11: 
yading@11:     while (!url_feof(pb)) {
yading@11:         chunk_type = avio_rb64(pb);
yading@11:         chunk_size = avio_rb64(pb);
yading@11: 
yading@11:         if (chunk_size < 4) {
yading@11:             av_log(s, AV_LOG_ERROR, "chunk size too small\n");
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         if (chunk_size > ((uint64_t)1 << 61)) {
yading@11:             av_log(s, AV_LOG_ERROR, "chunk size too big\n");
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11: 
yading@11:         switch (chunk_type) {
yading@11:         case STRMDATA:
yading@11:             dtshd->data_end = chunk_size + avio_tell(pb);
yading@11:             if (dtshd->data_end <= chunk_size)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             return 0;
yading@11:             break;
yading@11:         case FILEINFO:
yading@11:             if (chunk_size > INT_MAX)
yading@11:                 goto skip;
yading@11:             value = av_malloc(chunk_size);
yading@11:             if (!value)
yading@11:                 goto skip;
yading@11:             avio_read(pb, value, chunk_size);
yading@11:             value[chunk_size - 1] = 0;
yading@11:             av_dict_set(&s->metadata, "fileinfo", value,
yading@11:                         AV_DICT_DONT_STRDUP_VAL);
yading@11:             break;
yading@11:         default:
yading@11: skip:
yading@11:             ret = avio_skip(pb, chunk_size);
yading@11:             if (ret < 0)
yading@11:                 return ret;
yading@11:         };
yading@11:     }
yading@11: 
yading@11:     return AVERROR_EOF;
yading@11: }
yading@11: 
yading@11: static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     DTSHDDemuxContext *dtshd = s->priv_data;
yading@11:     int64_t size, left;
yading@11:     int ret;
yading@11: 
yading@11:     left = dtshd->data_end - avio_tell(s->pb);
yading@11:     size = FFMIN(left, 1024);
yading@11:     if (size <= 0)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     ret = av_get_packet(s->pb, pkt, size);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     pkt->stream_index = 0;
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_dtshd_demuxer = {
yading@11:     .name           = "dtshd",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("raw DTS-HD"),
yading@11:     .priv_data_size = sizeof(DTSHDDemuxContext),
yading@11:     .read_probe     = dtshd_probe,
yading@11:     .read_header    = dtshd_read_header,
yading@11:     .read_packet    = raw_read_packet,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11:     .extensions     = "dtshd",
yading@11:     .raw_codec_id   = AV_CODEC_ID_DTS,
yading@11: };