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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
/*
* Beam Software SIFF demuxer
* Copyright (c) 2007 Konstantin Shishkov
*
* 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/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
enum SIFFTags {
TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
};
enum VBFlags {
VB_HAS_GMC = 0x01,
VB_HAS_AUDIO = 0x04,
VB_HAS_VIDEO = 0x08,
VB_HAS_PALETTE = 0x10,
VB_HAS_LENGTH = 0x20
};
typedef struct SIFFContext {
int frames;
int cur_frame;
int rate;
int bits;
int block_align;
int has_video;
int has_audio;
int curstrm;
unsigned int pktsize;
int gmcsize;
unsigned int sndsize;
unsigned int flags;
uint8_t gmc[4];
} SIFFContext;
static int siff_probe(const AVProbeData *p)
{
uint32_t tag = AV_RL32(p->buf + 8);
/* check file header */
if (AV_RL32(p->buf) != TAG_SIFF ||
(tag != TAG_VBV1 && tag != TAG_SOUN))
return 0;
return AVPROBE_SCORE_MAX;
}
static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
{
AVStream *ast;
ast = avformat_new_stream(s, NULL);
if (!ast)
return AVERROR(ENOMEM);
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
ast->codecpar->bits_per_coded_sample = 8;
ast->codecpar->sample_rate = c->rate;
avpriv_set_pts_info(ast, 16, 1, c->rate);
ast->start_time = 0;
return 0;
}
static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
{
AVStream *st;
int width, height;
if (avio_rl32(pb) != TAG_VBHD) {
av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
return AVERROR_INVALIDDATA;
}
if (avio_rb32(pb) != 32) {
av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
return AVERROR_INVALIDDATA;
}
if (avio_rl16(pb) != 1) {
av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
return AVERROR_INVALIDDATA;
}
width = avio_rl16(pb);
height = avio_rl16(pb);
avio_skip(pb, 4);
c->frames = avio_rl16(pb);
if (!c->frames) {
av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
return AVERROR_INVALIDDATA;
}
c->bits = avio_rl16(pb);
c->rate = avio_rl16(pb);
c->block_align = c->rate * (c->bits >> 3);
avio_skip(pb, 16); // zeroes
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_VB;
st->codecpar->codec_tag = MKTAG('V', 'B', 'V', '1');
st->codecpar->width = width;
st->codecpar->height = height;
st->codecpar->format = AV_PIX_FMT_PAL8;
st->nb_frames =
st->duration = c->frames;
avpriv_set_pts_info(st, 16, 1, 12);
c->cur_frame = 0;
c->has_video = 1;
c->has_audio = !!c->rate;
c->curstrm = -1;
if (c->has_audio)
return create_audio_stream(s, c);
return 0;
}
static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
{
if (avio_rl32(pb) != TAG_SHDR) {
av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
return AVERROR_INVALIDDATA;
}
if (avio_rb32(pb) != 8) {
av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
return AVERROR_INVALIDDATA;
}
avio_skip(pb, 4); // unknown value
c->rate = avio_rl16(pb);
c->bits = avio_rl16(pb);
c->block_align = c->rate * (c->bits >> 3);
return create_audio_stream(s, c);
}
static int siff_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
SIFFContext *c = s->priv_data;
uint32_t tag;
int ret;
if (avio_rl32(pb) != TAG_SIFF)
return AVERROR_INVALIDDATA;
avio_skip(pb, 4); // ignore size
tag = avio_rl32(pb);
if (tag != TAG_VBV1 && tag != TAG_SOUN) {
av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
return AVERROR_INVALIDDATA;
}
if (tag == TAG_VBV1 && (ret = siff_parse_vbv1(s, c, pb)) < 0)
return ret;
if (tag == TAG_SOUN && (ret = siff_parse_soun(s, c, pb)) < 0)
return ret;
if (avio_rl32(pb) != MKTAG('B', 'O', 'D', 'Y')) {
av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
return AVERROR_INVALIDDATA;
}
avio_skip(pb, 4); // ignore size
return 0;
}
static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
{
SIFFContext *c = s->priv_data;
int ret;
if (c->has_video) {
unsigned int size;
if (c->cur_frame >= c->frames)
return AVERROR_EOF;
if (c->curstrm == -1) {
c->pktsize = avio_rl32(s->pb) - 4;
c->flags = avio_rl16(s->pb);
if (c->flags & VB_HAS_AUDIO && !c->has_audio)
return AVERROR_INVALIDDATA;
c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
if (c->gmcsize)
avio_read(s->pb, c->gmc, c->gmcsize);
c->sndsize = (c->flags & VB_HAS_AUDIO) ? avio_rl32(s->pb) : 0;
c->curstrm = !!(c->flags & VB_HAS_AUDIO);
}
if (!c->curstrm) {
if (c->pktsize < 2LL + c->sndsize + c->gmcsize)
return AVERROR_INVALIDDATA;
size = c->pktsize - c->sndsize - c->gmcsize - 2;
size = ffio_limit(s->pb, size);
if ((ret = av_new_packet(pkt, size + c->gmcsize + 2)) < 0)
return ret;
AV_WL16(pkt->data, c->flags);
if (c->gmcsize)
memcpy(pkt->data + 2, c->gmc, c->gmcsize);
if (avio_read(s->pb, pkt->data + 2 + c->gmcsize, size) != size) {
return AVERROR_INVALIDDATA;
}
pkt->stream_index = 0;
c->curstrm = -1;
} else {
int pktsize = av_get_packet(s->pb, pkt, c->sndsize - 4);
if (pktsize < 0)
return AVERROR(EIO);
pkt->stream_index = 1;
pkt->duration = pktsize;
c->curstrm = 0;
}
if (!c->cur_frame || c->curstrm)
pkt->flags |= AV_PKT_FLAG_KEY;
if (c->curstrm == -1)
c->cur_frame++;
} else {
int pktsize = av_get_packet(s->pb, pkt, c->block_align);
if (!pktsize)
return AVERROR_EOF;
if (pktsize <= 0)
return AVERROR(EIO);
pkt->duration = pktsize;
}
return pkt->size;
}
const AVInputFormat ff_siff_demuxer = {
.name = "siff",
.long_name = NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
.priv_data_size = sizeof(SIFFContext),
.read_probe = siff_probe,
.read_header = siff_read_header,
.read_packet = siff_read_packet,
.extensions = "vb,son",
};
|
