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dtshddec.c
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1 /*
2  * Raw DTS-HD demuxer
3  * Copyright (c) 2012 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/dict.h"
24 #include "avformat.h"
25 
26 #define AUPR_HDR 0x415550522D484452
27 #define AUPRINFO 0x41555052494E464F
28 #define BITSHVTB 0x4249545348565442
29 #define BLACKOUT 0x424C41434B4F5554
30 #define BRANCHPT 0x4252414E43485054
31 #define BUILDVER 0x4255494C44564552
32 #define CORESSMD 0x434F524553534D44
33 #define DTSHDHDR 0x4454534844484452
34 #define EXTSS_MD 0x45585453535f4d44
35 #define FILEINFO 0x46494C45494E464F
36 #define NAVI_TBL 0x4E4156492D54424C
37 #define STRMDATA 0x5354524D44415441
38 #define TIMECODE 0x54494D45434F4445
39 
40 typedef struct DTSHDDemuxContext {
41  uint64_t data_end;
43 
44 static int dtshd_probe(AVProbeData *p)
45 {
46  if (AV_RB64(p->buf) == DTSHDHDR)
47  return AVPROBE_SCORE_MAX;
48  return 0;
49 }
50 
52 {
53  DTSHDDemuxContext *dtshd = s->priv_data;
54  AVIOContext *pb = s->pb;
55  uint64_t chunk_type, chunk_size;
56  AVStream *st;
57  int ret;
58  char *value;
59 
60  st = avformat_new_stream(s, NULL);
61  if (!st)
62  return AVERROR(ENOMEM);
66 
67  while (!url_feof(pb)) {
68  chunk_type = avio_rb64(pb);
69  chunk_size = avio_rb64(pb);
70 
71  if (chunk_size < 4) {
72  av_log(s, AV_LOG_ERROR, "chunk size too small\n");
73  return AVERROR_INVALIDDATA;
74  }
75  if (chunk_size > ((uint64_t)1 << 61)) {
76  av_log(s, AV_LOG_ERROR, "chunk size too big\n");
77  return AVERROR_INVALIDDATA;
78  }
79 
80  switch (chunk_type) {
81  case STRMDATA:
82  dtshd->data_end = chunk_size + avio_tell(pb);
83  if (dtshd->data_end <= chunk_size)
84  return AVERROR_INVALIDDATA;
85  return 0;
86  break;
87  case FILEINFO:
88  if (chunk_size > INT_MAX)
89  goto skip;
90  value = av_malloc(chunk_size);
91  if (!value)
92  goto skip;
93  avio_read(pb, value, chunk_size);
94  value[chunk_size - 1] = 0;
95  av_dict_set(&s->metadata, "fileinfo", value,
97  break;
98  default:
99 skip:
100  ret = avio_skip(pb, chunk_size);
101  if (ret < 0)
102  return ret;
103  };
104  }
105 
106  return AVERROR_EOF;
107 }
108 
110 {
111  DTSHDDemuxContext *dtshd = s->priv_data;
112  int64_t size, left;
113  int ret;
114 
115  left = dtshd->data_end - avio_tell(s->pb);
116  size = FFMIN(left, 1024);
117  if (size <= 0)
118  return AVERROR_EOF;
119 
120  ret = av_get_packet(s->pb, pkt, size);
121  if (ret < 0)
122  return ret;
123 
124  pkt->stream_index = 0;
125 
126  return ret;
127 }
128 
130  .name = "dtshd",
131  .long_name = NULL_IF_CONFIG_SMALL("raw DTS-HD"),
132  .priv_data_size = sizeof(DTSHDDemuxContext),
137  .extensions = "dtshd",
138  .raw_codec_id = AV_CODEC_ID_DTS,
139 };