aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/dtshddec.c
blob: 1bd403c8435626aa0849a6a9744f451a207959c7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
 * Raw DTS-HD demuxer
 * Copyright (c) 2012 Paul B Mahol
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavcodec/dca.h"
#include "avformat.h"
#include "internal.h"

#define AUPR_HDR 0x415550522D484452
#define AUPRINFO 0x41555052494E464F
#define BITSHVTB 0x4249545348565442
#define BLACKOUT 0x424C41434B4F5554
#define BRANCHPT 0x4252414E43485054
#define BUILDVER 0x4255494C44564552
#define CORESSMD 0x434F524553534D44
#define DTSHDHDR 0x4454534844484452
#define EXTSS_MD 0x45585453535f4d44
#define FILEINFO 0x46494C45494E464F
#define NAVI_TBL 0x4E4156492D54424C
#define STRMDATA 0x5354524D44415441
#define TIMECODE 0x54494D45434F4445

typedef struct DTSHDDemuxContext {
    uint64_t    data_end;
} DTSHDDemuxContext;

static int dtshd_probe(AVProbeData *p)
{
    if (AV_RB64(p->buf) == DTSHDHDR)
        return AVPROBE_SCORE_MAX;
    return 0;
}

static int dtshd_read_header(AVFormatContext *s)
{
    DTSHDDemuxContext *dtshd = s->priv_data;
    AVIOContext *pb = s->pb;
    uint64_t chunk_type, chunk_size;
    int64_t duration, data_start;
    AVStream *st;
    int ret;
    char *value;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);
    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
    st->codecpar->codec_id   = AV_CODEC_ID_DTS;
    st->need_parsing         = AVSTREAM_PARSE_FULL_RAW;

    for (;;) {
        chunk_type = avio_rb64(pb);
        chunk_size = avio_rb64(pb);

        if (avio_feof(pb))
            break;

        if (chunk_size < 4) {
            av_log(s, AV_LOG_ERROR, "chunk size too small\n");
            return AVERROR_INVALIDDATA;
        }
        if (chunk_size > ((uint64_t)1 << 61)) {
            av_log(s, AV_LOG_ERROR, "chunk size too big\n");
            return AVERROR_INVALIDDATA;
        }

        switch (chunk_type) {
        case STRMDATA:
            data_start = avio_tell(pb);
            dtshd->data_end = data_start + chunk_size;
            if (dtshd->data_end <= chunk_size)
                return AVERROR_INVALIDDATA;
            if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
                goto break_loop;
            goto skip;
            break;
        case AUPR_HDR:
            if (chunk_size < 21)
                return AVERROR_INVALIDDATA;
            avio_skip(pb, 3);
            st->codecpar->sample_rate = avio_rb24(pb);
            if (!st->codecpar->sample_rate)
                return AVERROR_INVALIDDATA;
            duration  = avio_rb32(pb); // num_frames
            duration *= avio_rb16(pb); // samples_per_frames
            st->duration = duration;
            avio_skip(pb, 5);
            st->codecpar->channels = ff_dca_count_chs_for_mask(avio_rb16(pb));
            st->codecpar->initial_padding = avio_rb16(pb);
            avio_skip(pb, chunk_size - 21);
            break;
        case FILEINFO:
            if (chunk_size > INT_MAX)
                goto skip;
            value = av_malloc(chunk_size);
            if (!value)
                goto skip;
            avio_read(pb, value, chunk_size);
            value[chunk_size - 1] = 0;
            av_dict_set(&s->metadata, "fileinfo", value,
                        AV_DICT_DONT_STRDUP_VAL);
            break;
        default:
skip:
            ret = avio_skip(pb, chunk_size);
            if (ret < 0)
                return ret;
        };
    }

    if (!dtshd->data_end)
        return AVERROR_EOF;

    avio_seek(pb, data_start, SEEK_SET);

break_loop:
    if (st->codecpar->sample_rate)
        avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

    return 0;
}

static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    DTSHDDemuxContext *dtshd = s->priv_data;
    int64_t size, left;
    int ret;

    left = dtshd->data_end - avio_tell(s->pb);
    size = FFMIN(left, 1024);
    if (size <= 0)
        return AVERROR_EOF;

    ret = av_get_packet(s->pb, pkt, size);
    if (ret < 0)
        return ret;

    pkt->stream_index = 0;

    return ret;
}

AVInputFormat ff_dtshd_demuxer = {
    .name           = "dtshd",
    .long_name      = NULL_IF_CONFIG_SMALL("raw DTS-HD"),
    .priv_data_size = sizeof(DTSHDDemuxContext),
    .read_probe     = dtshd_probe,
    .read_header    = dtshd_read_header,
    .read_packet    = raw_read_packet,
    .flags          = AVFMT_GENERIC_INDEX,
    .extensions     = "dtshd",
    .raw_codec_id   = AV_CODEC_ID_DTS,
};