2 * Deluxe Paint Animation demuxer
3 * Copyright (c) 2009 Peter Ross
5 * This file is part of FFmpeg.
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.
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.
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
24 * Deluxe Paint Animation demuxer
27 #include "libavutil/intreadwrite.h"
33 unsigned int nb_records;
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) */
47 #define LPF_TAG MKTAG('L','P','F',' ')
48 #define ANIM_TAG MKTAG('A','N','I','M')
50 static int probe(const AVProbeData *p)
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;
61 * @return page containing the requested record or AVERROR_XXX
63 static int find_record(const AnmDemuxContext *anm, int record)
67 if (record >= anm->nb_records)
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)
76 return AVERROR_INVALIDDATA;
79 static int read_header(AVFormatContext *s)
81 AnmDemuxContext *anm = s->priv_data;
82 AVIOContext *pb = s->pb;
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;
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;
100 st = avformat_new_stream(s, NULL);
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)
110 avio_skip(pb, 1); /* frame rate multiplier info */
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);
116 avio_skip(pb, 1); /* last_delta_valid */
118 if (avio_r8(pb) != 0)
121 if (avio_r8(pb) != 1)
124 avio_skip(pb, 1); /* other recs per frame */
126 if (avio_r8(pb) != 1)
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));
134 /* color cycling and palette data */
135 ret = ff_get_extradata(s, st->codecpar, s->pb, 16*8 + 4*256);
139 /* read page table */
140 ret = avio_seek(pb, anm->page_table_offset, SEEK_SET);
144 for (i = 0; i < MAX_PAGES; i++) {
145 Page *p = &anm->pt[i];
146 p->base_record = avio_rl16(pb);
147 p->nb_records = avio_rl16(pb);
148 p->size = avio_rl16(pb);
151 /* find page of first frame */
152 anm->page = find_record(anm, 0);
161 avpriv_request_sample(s, "Invalid header element");
162 return AVERROR_PATCHWELCOME;
165 static int read_packet(AVFormatContext *s,
168 AnmDemuxContext *anm = s->priv_data;
169 AVIOContext *pb = s->pb;
171 int tmp, record_size;
173 if (avio_feof(s->pb))
180 p = &anm->pt[anm->page];
182 /* parse page header */
183 if (anm->record < 0) {
184 avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16), SEEK_SET);
185 avio_skip(pb, 8 + 2*p->nb_records);
189 /* if we have fetched all records in this page, then find the
190 next page and repeat */
191 if (anm->record >= p->nb_records) {
192 anm->page = find_record(anm, p->base_record + p->nb_records);
199 /* fetch record size */
201 avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16) +
202 8 + anm->record * 2, SEEK_SET);
203 record_size = avio_rl16(pb);
204 avio_seek(pb, tmp, SEEK_SET);
207 pkt->size = av_get_packet(s->pb, pkt, record_size);
210 if (p->base_record + anm->record == 0)
211 pkt->flags |= AV_PKT_FLAG_KEY;
217 AVInputFormat ff_anm_demuxer = {
219 .long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
220 .priv_data_size = sizeof(AnmDemuxContext),
222 .read_header = read_header,
223 .read_packet = read_packet,