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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; | |
42 | } DTSHDDemuxContext; | |
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 | ||
51 | static int dtshd_read_header(AVFormatContext *s) | |
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); | |
63 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
64 | st->codec->codec_id = AV_CODEC_ID_DTS; | |
65 | st->need_parsing = AVSTREAM_PARSE_FULL_RAW; | |
66 | ||
67 | while (!avio_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, | |
96 | AV_DICT_DONT_STRDUP_VAL); | |
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 | ||
109 | static int raw_read_packet(AVFormatContext *s, AVPacket *pkt) | |
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 | ||
129 | AVInputFormat ff_dtshd_demuxer = { | |
130 | .name = "dtshd", | |
131 | .long_name = NULL_IF_CONFIG_SMALL("raw DTS-HD"), | |
132 | .priv_data_size = sizeof(DTSHDDemuxContext), | |
133 | .read_probe = dtshd_probe, | |
134 | .read_header = dtshd_read_header, | |
135 | .read_packet = raw_read_packet, | |
136 | .flags = AVFMT_GENERIC_INDEX, | |
137 | .extensions = "dtshd", | |
138 | .raw_codec_id = AV_CODEC_ID_DTS, | |
139 | }; |