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
|
/*
* Simbiosis game demuxer
*
* Copyright (C) 2021 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 "avformat.h"
#include "internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avassert.h"
#include "libavutil/internal.h"
#include "argo_asf.h"
#define IMX_TAG MKTAG('I', 'M', 'A', 'X')
typedef struct SimbiosisIMXDemuxContext {
uint8_t pal[AVPALETTE_SIZE];
int pal_changed;
} SimbiosisIMXDemuxContext;
static int simbiosis_imx_probe(const AVProbeData *p)
{
if (AV_RL32(p->buf) != IMX_TAG)
return 0;
if (AV_RN32(p->buf+4) == 0)
return 0;
if (AV_RN16(p->buf+8) == 0)
return 0;
if (AV_RL16(p->buf+10) != 0x102)
return 0;
return AVPROBE_SCORE_EXTENSION + 10;
}
static int simbiosis_imx_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVStream *vst, *ast;
int rate;
vst = avformat_new_stream(s, NULL);
ast = avformat_new_stream(s, NULL);
if (!vst || !ast)
return AVERROR(ENOMEM);
avio_skip(pb, 4);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_tag = 0;
vst->codecpar->format = AV_PIX_FMT_PAL8;
vst->codecpar->codec_id = AV_CODEC_ID_SIMBIOSIS_IMX;
vst->start_time = 0;
vst->nb_frames = avio_rl32(pb);
rate = avio_rl16(pb);
avio_skip(pb, 12);
avpriv_set_pts_info(vst, 64, 1, rate);
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_tag = 0;
ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
ast->codecpar->channels = 1;
ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
ast->codecpar->sample_rate = 22050;
ast->start_time = 0;
avpriv_set_pts_info(ast, 64, 1, 22050);
return 0;
}
static int simbiosis_imx_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
SimbiosisIMXDemuxContext *imx = s->priv_data;
uint32_t chunk_size, chunk_type;
int64_t pos = avio_tell(pb);
int ret, idx = -1;
retry:
if (avio_feof(pb))
return AVERROR_EOF;
chunk_size = avio_rl32(pb);
chunk_type = avio_rl32(pb);
switch (chunk_type) {
case 0xAAFF:
return AVERROR_EOF;
case 0xAA99:
idx = 1;
break;
case 0xAA97:
idx = 0;
break;
case 0xAA98:
for (int i = 0; i < chunk_size / 3; i++) {
unsigned r = avio_r8(pb) << 18;
unsigned g = avio_r8(pb) << 10;
unsigned b = avio_r8(pb) << 2;
AV_WL32(imx->pal + i * 4, (0xFFU << 24) | r | g | b);
}
imx->pal_changed = 1;
idx = -1;
break;
default:
return AVERROR_INVALIDDATA;
}
if (idx == -1)
goto retry;
ret = av_get_packet(pb, pkt, chunk_size);
if (ret < 0)
return ret;
if (imx->pal_changed && idx == 0) {
uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
AVPALETTE_SIZE);
if (!pal)
return AVERROR(ENOMEM);
memcpy(pal, imx->pal, AVPALETTE_SIZE);
imx->pal_changed = 0;
pkt->flags |= AV_PKT_FLAG_KEY;
}
pkt->pos = pos;
pkt->stream_index = idx;
pkt->duration = idx ? chunk_size : 1;
return ret;
}
AVInputFormat ff_simbiosis_imx_demuxer = {
.name = "simbiosis_imx",
.long_name = NULL_IF_CONFIG_SMALL("Simbiosis Interactive IMX"),
.priv_data_size = sizeof(SimbiosisIMXDemuxContext),
.read_probe = simbiosis_imx_probe,
.read_header = simbiosis_imx_read_header,
.read_packet = simbiosis_imx_read_packet,
.extensions = "imx",
.flags = AVFMT_GENERIC_INDEX,
};
|
