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
|
/*
* HCA demuxer
* Copyright (c) 2020 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/opt.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "internal.h"
#define HCA_MASK 0x7f7f7f7f
typedef struct HCADemuxContext {
AVClass *class;
int64_t keyl;
int64_t keyh;
int subkey;
} HCADemuxContext;
static int hca_probe(const AVProbeData *p)
{
if ((AV_RL32(p->buf) & HCA_MASK) != MKTAG('H', 'C', 'A', 0))
return 0;
if ((AV_RL32(p->buf + 8) & HCA_MASK) != MKTAG('f', 'm', 't', 0))
return 0;
return AVPROBE_SCORE_MAX / 3;
}
static int hca_read_header(AVFormatContext *s)
{
HCADemuxContext *hca = s->priv_data;
AVCodecParameters *par;
GetByteContext gb;
AVIOContext *pb = s->pb;
AVStream *st;
uint32_t chunk;
uint16_t version;
uint32_t block_count;
uint16_t block_size, data_offset;
int ret;
avio_skip(pb, 4);
version = avio_rb16(pb);
data_offset = avio_rb16(pb);
if (data_offset <= 8)
return AVERROR_INVALIDDATA;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
par = st->codecpar;
ret = ff_alloc_extradata(par, data_offset + 10);
if (ret < 0)
return ret;
ret = avio_read(pb, par->extradata + 8, par->extradata_size - 8 - 10);
if (ret < par->extradata_size - 8 - 10)
return AVERROR(EIO);
AV_WL32(par->extradata, MKTAG('H', 'C', 'A', 0));
AV_WB16(par->extradata + 4, version);
AV_WB16(par->extradata + 6, data_offset);
AV_WB32(par->extradata + par->extradata_size - 10, hca->keyh);
AV_WB32(par->extradata + par->extradata_size - 6, hca->keyl);
AV_WB16(par->extradata + par->extradata_size - 2, hca->subkey);
bytestream2_init(&gb, par->extradata + 8, par->extradata_size - 8);
if ((bytestream2_get_le32(&gb) & HCA_MASK) != MKTAG('f', 'm', 't', 0))
return AVERROR_INVALIDDATA;
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->codec_id = AV_CODEC_ID_HCA;
par->codec_tag = 0;
st->codecpar->ch_layout.nb_channels = bytestream2_get_byte(&gb);
par->sample_rate = bytestream2_get_be24(&gb);
block_count = bytestream2_get_be32(&gb);
bytestream2_skip(&gb, 4);
chunk = bytestream2_get_le32(&gb) & HCA_MASK;
if (chunk == MKTAG('c', 'o', 'm', 'p')) {
block_size = bytestream2_get_be16(&gb);
} else if (chunk == MKTAG('d', 'e', 'c', 0)) {
block_size = bytestream2_get_be16(&gb);
} else {
return AVERROR_INVALIDDATA;
}
if (block_size < 8)
return AVERROR_INVALIDDATA;
par->block_align = block_size;
st->duration = 1024 * block_count;
avio_seek(pb, data_offset, SEEK_SET);
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
return 0;
}
static int hca_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVCodecParameters *par = s->streams[0]->codecpar;
int ret;
ret = av_get_packet(s->pb, pkt, par->block_align);
pkt->duration = 1024;
return ret;
}
#define OFFSET(x) offsetof(HCADemuxContext, x)
static const AVOption hca_options[] = {
{ "hca_lowkey",
"Low key used for handling CRI HCA files", OFFSET(keyl),
AV_OPT_TYPE_INT64, {.i64=0}, .min = 0, .max = UINT32_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM, },
{ "hca_highkey",
"High key used for handling CRI HCA files", OFFSET(keyh),
AV_OPT_TYPE_INT64, {.i64=0}, .min = 0, .max = UINT32_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM, },
{ "hca_subkey",
"Subkey used for handling CRI HCA files", OFFSET(subkey),
AV_OPT_TYPE_INT, {.i64=0}, .min = 0, .max = UINT16_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass hca_class = {
.class_name = "hca",
.option = hca_options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVInputFormat ff_hca_demuxer = {
.name = "hca",
.long_name = NULL_IF_CONFIG_SMALL("CRI HCA"),
.priv_class = &hca_class,
.priv_data_size = sizeof(HCADemuxContext),
.read_probe = hca_probe,
.read_header = hca_read_header,
.read_packet = hca_read_packet,
.extensions = "hca",
.flags = AVFMT_GENERIC_INDEX,
};
|
