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
|
/*
* Deluxe Paint Animation demuxer
* Copyright (c) 2009 Peter Ross
*
* 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
*/
/**
* @file
* Deluxe Paint Animation demuxer
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
typedef struct {
int base_record;
unsigned int nb_records;
int size;
} Page;
typedef struct {
unsigned int nb_pages; /**< total pages in file */
unsigned int nb_records; /**< total records in file */
int page_table_offset;
#define MAX_PAGES 256 /**< Deluxe Paint hardcoded value */
Page pt[MAX_PAGES]; /**< page table */
int page; /**< current page (or AVERROR_xxx code) */
int record; /**< current record (with in page) */
} AnmDemuxContext;
#define LPF_TAG MKTAG('L','P','F',' ')
#define ANIM_TAG MKTAG('A','N','I','M')
static int probe(AVProbeData *p)
{
/* verify tags and video dimensions */
if (AV_RL32(&p->buf[0]) == LPF_TAG &&
AV_RL32(&p->buf[16]) == ANIM_TAG &&
AV_RL16(&p->buf[20]) && AV_RL16(&p->buf[22]))
return AVPROBE_SCORE_MAX;
return 0;
}
/**
* @return page containing the requested record or AVERROR_XXX
*/
static int find_record(const AnmDemuxContext *anm, int record)
{
int i;
if (record >= anm->nb_records)
return AVERROR_EOF;
for (i = 0; i < MAX_PAGES; i++) {
const Page *p = &anm->pt[i];
if (p->nb_records > 0 && record >= p->base_record && record < p->base_record + p->nb_records)
return i;
}
return AVERROR_INVALIDDATA;
}
static int read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AnmDemuxContext *anm = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
int i, ret;
avio_seek(pb, 4, SEEK_CUR); /* magic number */
if (avio_rl16(pb) != MAX_PAGES) {
av_log_ask_for_sample(s, "max_pages != " AV_STRINGIFY(MAX_PAGES) "\n");
return AVERROR_INVALIDDATA;
}
anm->nb_pages = avio_rl16(pb);
anm->nb_records = avio_rl32(pb);
avio_seek(pb, 2, SEEK_CUR); /* max records per page */
anm->page_table_offset = avio_rl16(pb);
if (avio_rl32(pb) != ANIM_TAG)
return AVERROR_INVALIDDATA;
/* video stream */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_ANM;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = avio_rl16(pb);
st->codec->height = avio_rl16(pb);
if (avio_r8(pb) != 0)
goto invalid;
avio_seek(pb, 1, SEEK_CUR); /* frame rate multiplier info */
/* ignore last delta record (used for looping) */
if (avio_r8(pb)) /* has_last_delta */
anm->nb_records = FFMAX(anm->nb_records - 1, 0);
avio_seek(pb, 1, SEEK_CUR); /* last_delta_valid */
if (avio_r8(pb) != 0)
goto invalid;
if (avio_r8(pb) != 1)
goto invalid;
avio_seek(pb, 1, SEEK_CUR); /* other recs per frame */
if (avio_r8(pb) != 1)
goto invalid;
avio_seek(pb, 32, SEEK_CUR); /* record_types */
st->nb_frames = avio_rl32(pb);
av_set_pts_info(st, 64, 1, avio_rl16(pb));
avio_seek(pb, 58, SEEK_CUR);
/* color cycling and palette data */
st->codec->extradata_size = 16*8 + 4*256;
st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata) {
ret = AVERROR(ENOMEM);
goto close_and_return;
}
ret = avio_read(pb, st->codec->extradata, st->codec->extradata_size);
if (ret < 0)
goto close_and_return;
/* read page table */
ret = avio_seek(pb, anm->page_table_offset, SEEK_SET);
if (ret < 0)
goto close_and_return;
for (i = 0; i < MAX_PAGES; i++) {
Page *p = &anm->pt[i];
p->base_record = avio_rl16(pb);
p->nb_records = avio_rl16(pb);
p->size = avio_rl16(pb);
}
/* find page of first frame */
anm->page = find_record(anm, 0);
if (anm->page < 0) {
ret = anm->page;
goto close_and_return;
}
anm->record = -1;
return 0;
invalid:
av_log_ask_for_sample(s, NULL);
ret = AVERROR_INVALIDDATA;
close_and_return:
av_close_input_stream(s);
return ret;
}
static int read_packet(AVFormatContext *s,
AVPacket *pkt)
{
AnmDemuxContext *anm = s->priv_data;
AVIOContext *pb = s->pb;
Page *p;
int tmp, record_size;
if (url_feof(s->pb))
return AVERROR(EIO);
if (anm->page < 0)
return anm->page;
repeat:
p = &anm->pt[anm->page];
/* parse page header */
if (anm->record < 0) {
avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16), SEEK_SET);
avio_seek(pb, 8 + 2*p->nb_records, SEEK_CUR);
anm->record = 0;
}
/* if we have fetched all records in this page, then find the
next page and repeat */
if (anm->record >= p->nb_records) {
anm->page = find_record(anm, p->base_record + p->nb_records);
if (anm->page < 0)
return anm->page;
anm->record = -1;
goto repeat;
}
/* fetch record size */
tmp = url_ftell(pb);
avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16) +
8 + anm->record * 2, SEEK_SET);
record_size = avio_rl16(pb);
avio_seek(pb, tmp, SEEK_SET);
/* fetch record */
pkt->size = av_get_packet(s->pb, pkt, record_size);
if (pkt->size < 0)
return pkt->size;
if (p->base_record + anm->record == 0)
pkt->flags |= AV_PKT_FLAG_KEY;
anm->record++;
return 0;
}
AVInputFormat ff_anm_demuxer = {
"anm",
NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
sizeof(AnmDemuxContext),
probe,
read_header,
read_packet,
};
|
