blob: b31757ab0adf38b6abc21b977539dca5624cfccc
1 | /* |
2 | * Deluxe Paint Animation demuxer |
3 | * Copyright (c) 2009 Peter Ross |
4 | * |
5 | * This file is part of FFmpeg. |
6 | * |
7 | * FFmpeg is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU Lesser General Public |
9 | * License as published by the Free Software Foundation; either |
10 | * version 2.1 of the License, or (at your option) any later version. |
11 | * |
12 | * FFmpeg is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Lesser General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU Lesser General Public |
18 | * License along with FFmpeg; if not, write to the Free Software |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 | */ |
21 | |
22 | /** |
23 | * @file |
24 | * Deluxe Paint Animation demuxer |
25 | */ |
26 | |
27 | #include "libavutil/intreadwrite.h" |
28 | #include "avformat.h" |
29 | #include "internal.h" |
30 | |
31 | typedef struct Page { |
32 | int base_record; |
33 | unsigned int nb_records; |
34 | int size; |
35 | } Page; |
36 | |
37 | typedef struct AnmDemuxContext { |
38 | unsigned int nb_pages; /**< total pages in file */ |
39 | unsigned int nb_records; /**< total records in file */ |
40 | int page_table_offset; |
41 | #define MAX_PAGES 256 /**< Deluxe Paint hardcoded value */ |
42 | Page pt[MAX_PAGES]; /**< page table */ |
43 | int page; /**< current page (or AVERROR_xxx code) */ |
44 | int record; /**< current record (with in page) */ |
45 | } AnmDemuxContext; |
46 | |
47 | #define LPF_TAG MKTAG('L','P','F',' ') |
48 | #define ANIM_TAG MKTAG('A','N','I','M') |
49 | |
50 | static int probe(AVProbeData *p) |
51 | { |
52 | /* verify tags and video dimensions */ |
53 | if (AV_RL32(&p->buf[0]) == LPF_TAG && |
54 | AV_RL32(&p->buf[16]) == ANIM_TAG && |
55 | AV_RL16(&p->buf[20]) && AV_RL16(&p->buf[22])) |
56 | return AVPROBE_SCORE_MAX; |
57 | return 0; |
58 | } |
59 | |
60 | /** |
61 | * @return page containing the requested record or AVERROR_XXX |
62 | */ |
63 | static int find_record(const AnmDemuxContext *anm, int record) |
64 | { |
65 | int i; |
66 | |
67 | if (record >= anm->nb_records) |
68 | return AVERROR_EOF; |
69 | |
70 | for (i = 0; i < MAX_PAGES; i++) { |
71 | const Page *p = &anm->pt[i]; |
72 | if (p->nb_records > 0 && record >= p->base_record && record < p->base_record + p->nb_records) |
73 | return i; |
74 | } |
75 | |
76 | return AVERROR_INVALIDDATA; |
77 | } |
78 | |
79 | static int read_header(AVFormatContext *s) |
80 | { |
81 | AnmDemuxContext *anm = s->priv_data; |
82 | AVIOContext *pb = s->pb; |
83 | AVStream *st; |
84 | int i, ret; |
85 | |
86 | avio_skip(pb, 4); /* magic number */ |
87 | if (avio_rl16(pb) != MAX_PAGES) { |
88 | avpriv_request_sample(s, "max_pages != " AV_STRINGIFY(MAX_PAGES)); |
89 | return AVERROR_PATCHWELCOME; |
90 | } |
91 | |
92 | anm->nb_pages = avio_rl16(pb); |
93 | anm->nb_records = avio_rl32(pb); |
94 | avio_skip(pb, 2); /* max records per page */ |
95 | anm->page_table_offset = avio_rl16(pb); |
96 | if (avio_rl32(pb) != ANIM_TAG) |
97 | return AVERROR_INVALIDDATA; |
98 | |
99 | /* video stream */ |
100 | st = avformat_new_stream(s, NULL); |
101 | if (!st) |
102 | return AVERROR(ENOMEM); |
103 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
104 | st->codecpar->codec_id = AV_CODEC_ID_ANM; |
105 | st->codecpar->codec_tag = 0; /* no fourcc */ |
106 | st->codecpar->width = avio_rl16(pb); |
107 | st->codecpar->height = avio_rl16(pb); |
108 | if (avio_r8(pb) != 0) |
109 | goto invalid; |
110 | avio_skip(pb, 1); /* frame rate multiplier info */ |
111 | |
112 | /* ignore last delta record (used for looping) */ |
113 | if (avio_r8(pb)) /* has_last_delta */ |
114 | anm->nb_records = FFMAX(anm->nb_records - 1, 0); |
115 | |
116 | avio_skip(pb, 1); /* last_delta_valid */ |
117 | |
118 | if (avio_r8(pb) != 0) |
119 | goto invalid; |
120 | |
121 | if (avio_r8(pb) != 1) |
122 | goto invalid; |
123 | |
124 | avio_skip(pb, 1); /* other recs per frame */ |
125 | |
126 | if (avio_r8(pb) != 1) |
127 | goto invalid; |
128 | |
129 | avio_skip(pb, 32); /* record_types */ |
130 | st->nb_frames = avio_rl32(pb); |
131 | avpriv_set_pts_info(st, 64, 1, avio_rl16(pb)); |
132 | avio_skip(pb, 58); |
133 | |
134 | /* color cycling and palette data */ |
135 | st->codecpar->extradata_size = 16*8 + 4*256; |
136 | st->codecpar->extradata = av_mallocz(st->codecpar->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); |
137 | if (!st->codecpar->extradata) { |
138 | return AVERROR(ENOMEM); |
139 | } |
140 | ret = avio_read(pb, st->codecpar->extradata, st->codecpar->extradata_size); |
141 | if (ret < 0) |
142 | return ret; |
143 | |
144 | /* read page table */ |
145 | ret = avio_seek(pb, anm->page_table_offset, SEEK_SET); |
146 | if (ret < 0) |
147 | return ret; |
148 | |
149 | for (i = 0; i < MAX_PAGES; i++) { |
150 | Page *p = &anm->pt[i]; |
151 | p->base_record = avio_rl16(pb); |
152 | p->nb_records = avio_rl16(pb); |
153 | p->size = avio_rl16(pb); |
154 | } |
155 | |
156 | /* find page of first frame */ |
157 | anm->page = find_record(anm, 0); |
158 | if (anm->page < 0) { |
159 | return anm->page; |
160 | } |
161 | |
162 | anm->record = -1; |
163 | return 0; |
164 | |
165 | invalid: |
166 | avpriv_request_sample(s, "Invalid header element"); |
167 | return AVERROR_PATCHWELCOME; |
168 | } |
169 | |
170 | static int read_packet(AVFormatContext *s, |
171 | AVPacket *pkt) |
172 | { |
173 | AnmDemuxContext *anm = s->priv_data; |
174 | AVIOContext *pb = s->pb; |
175 | Page *p; |
176 | int tmp, record_size; |
177 | |
178 | if (avio_feof(s->pb)) |
179 | return AVERROR(EIO); |
180 | |
181 | if (anm->page < 0) |
182 | return anm->page; |
183 | |
184 | repeat: |
185 | p = &anm->pt[anm->page]; |
186 | |
187 | /* parse page header */ |
188 | if (anm->record < 0) { |
189 | avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16), SEEK_SET); |
190 | avio_skip(pb, 8 + 2*p->nb_records); |
191 | anm->record = 0; |
192 | } |
193 | |
194 | /* if we have fetched all records in this page, then find the |
195 | next page and repeat */ |
196 | if (anm->record >= p->nb_records) { |
197 | anm->page = find_record(anm, p->base_record + p->nb_records); |
198 | if (anm->page < 0) |
199 | return anm->page; |
200 | anm->record = -1; |
201 | goto repeat; |
202 | } |
203 | |
204 | /* fetch record size */ |
205 | tmp = avio_tell(pb); |
206 | avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16) + |
207 | 8 + anm->record * 2, SEEK_SET); |
208 | record_size = avio_rl16(pb); |
209 | avio_seek(pb, tmp, SEEK_SET); |
210 | |
211 | /* fetch record */ |
212 | pkt->size = av_get_packet(s->pb, pkt, record_size); |
213 | if (pkt->size < 0) |
214 | return pkt->size; |
215 | if (p->base_record + anm->record == 0) |
216 | pkt->flags |= AV_PKT_FLAG_KEY; |
217 | |
218 | anm->record++; |
219 | return 0; |
220 | } |
221 | |
222 | AVInputFormat ff_anm_demuxer = { |
223 | .name = "anm", |
224 | .long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"), |
225 | .priv_data_size = sizeof(AnmDemuxContext), |
226 | .read_probe = probe, |
227 | .read_header = read_header, |
228 | .read_packet = read_packet, |
229 | }; |
230 |