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 "libavcodec/dca.h"
25 #include "avformat.h"
26 #include "internal.h"
27
28 #define AUPR_HDR 0x415550522D484452
29 #define AUPRINFO 0x41555052494E464F
30 #define BITSHVTB 0x4249545348565442
31 #define BLACKOUT 0x424C41434B4F5554
32 #define BRANCHPT 0x4252414E43485054
33 #define BUILDVER 0x4255494C44564552
34 #define CORESSMD 0x434F524553534D44
35 #define DTSHDHDR 0x4454534844484452
36 #define EXTSS_MD 0x45585453535f4d44
37 #define FILEINFO 0x46494C45494E464F
38 #define NAVI_TBL 0x4E4156492D54424C
39 #define STRMDATA 0x5354524D44415441
40 #define TIMECODE 0x54494D45434F4445
41
42 typedef struct DTSHDDemuxContext {
43 uint64_t data_end;
44 } DTSHDDemuxContext;
45
dtshd_probe(AVProbeData * p)46 static int dtshd_probe(AVProbeData *p)
47 {
48 if (AV_RB64(p->buf) == DTSHDHDR)
49 return AVPROBE_SCORE_MAX;
50 return 0;
51 }
52
dtshd_read_header(AVFormatContext * s)53 static int dtshd_read_header(AVFormatContext *s)
54 {
55 DTSHDDemuxContext *dtshd = s->priv_data;
56 AVIOContext *pb = s->pb;
57 uint64_t chunk_type, chunk_size;
58 int64_t duration, data_start;
59 AVStream *st;
60 int ret;
61 char *value;
62
63 st = avformat_new_stream(s, NULL);
64 if (!st)
65 return AVERROR(ENOMEM);
66 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
67 st->codecpar->codec_id = AV_CODEC_ID_DTS;
68 st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
69
70 for (;;) {
71 chunk_type = avio_rb64(pb);
72 chunk_size = avio_rb64(pb);
73
74 if (avio_feof(pb))
75 break;
76
77 if (chunk_size < 4) {
78 av_log(s, AV_LOG_ERROR, "chunk size too small\n");
79 return AVERROR_INVALIDDATA;
80 }
81 if (chunk_size > ((uint64_t)1 << 61)) {
82 av_log(s, AV_LOG_ERROR, "chunk size too big\n");
83 return AVERROR_INVALIDDATA;
84 }
85
86 switch (chunk_type) {
87 case STRMDATA:
88 data_start = avio_tell(pb);
89 dtshd->data_end = data_start + chunk_size;
90 if (dtshd->data_end <= chunk_size)
91 return AVERROR_INVALIDDATA;
92 if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
93 goto break_loop;
94 goto skip;
95 break;
96 case AUPR_HDR:
97 if (chunk_size < 21)
98 return AVERROR_INVALIDDATA;
99 avio_skip(pb, 3);
100 st->codecpar->sample_rate = avio_rb24(pb);
101 if (!st->codecpar->sample_rate)
102 return AVERROR_INVALIDDATA;
103 duration = avio_rb32(pb); // num_frames
104 duration *= avio_rb16(pb); // samples_per_frames
105 st->duration = duration;
106 avio_skip(pb, 5);
107 st->codecpar->channels = ff_dca_count_chs_for_mask(avio_rb16(pb));
108 st->codecpar->initial_padding = avio_rb16(pb);
109 avio_skip(pb, chunk_size - 21);
110 break;
111 case FILEINFO:
112 if (chunk_size > INT_MAX)
113 goto skip;
114 value = av_malloc(chunk_size);
115 if (!value)
116 goto skip;
117 avio_read(pb, value, chunk_size);
118 value[chunk_size - 1] = 0;
119 av_dict_set(&s->metadata, "fileinfo", value,
120 AV_DICT_DONT_STRDUP_VAL);
121 break;
122 default:
123 skip:
124 ret = avio_skip(pb, chunk_size);
125 if (ret < 0)
126 return ret;
127 };
128 }
129
130 if (!dtshd->data_end)
131 return AVERROR_EOF;
132
133 avio_seek(pb, data_start, SEEK_SET);
134
135 break_loop:
136 if (st->codecpar->sample_rate)
137 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
138
139 return 0;
140 }
141
raw_read_packet(AVFormatContext * s,AVPacket * pkt)142 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
143 {
144 DTSHDDemuxContext *dtshd = s->priv_data;
145 int64_t size, left;
146 int ret;
147
148 left = dtshd->data_end - avio_tell(s->pb);
149 size = FFMIN(left, 1024);
150 if (size <= 0)
151 return AVERROR_EOF;
152
153 ret = av_get_packet(s->pb, pkt, size);
154 if (ret < 0)
155 return ret;
156
157 pkt->stream_index = 0;
158
159 return ret;
160 }
161
162 AVInputFormat ff_dtshd_demuxer = {
163 .name = "dtshd",
164 .long_name = NULL_IF_CONFIG_SMALL("raw DTS-HD"),
165 .priv_data_size = sizeof(DTSHDDemuxContext),
166 .read_probe = dtshd_probe,
167 .read_header = dtshd_read_header,
168 .read_packet = raw_read_packet,
169 .flags = AVFMT_GENERIC_INDEX,
170 .extensions = "dtshd",
171 .raw_codec_id = AV_CODEC_ID_DTS,
172 };
173