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"
32 unsigned int nb_records;
37 unsigned int nb_pages; /**< total pages in file */
38 unsigned int nb_records; /**< total records in file */
39 int page_table_offset;
40 #define MAX_PAGES 256 /**< Deluxe Paint hardcoded value */
41 Page pt[MAX_PAGES]; /**< page table */
42 int page; /**< current page (or AVERROR_xxx code) */
43 int record; /**< current record (with in page) */
46 #define LPF_TAG MKTAG('L','P','F',' ')
47 #define ANIM_TAG MKTAG('A','N','I','M')
49 static int probe(AVProbeData *p)
51 /* verify tags and video dimensions */
52 if (AV_RL32(&p->buf[0]) == LPF_TAG &&
53 AV_RL32(&p->buf[16]) == ANIM_TAG &&
54 AV_RL16(&p->buf[20]) && AV_RL16(&p->buf[22]))
55 return AVPROBE_SCORE_MAX;
60 * @return page containing the requested record or AVERROR_XXX
62 static int find_record(const AnmDemuxContext *anm, int record)
66 if (record >= anm->nb_records)
69 for (i = 0; i < MAX_PAGES; i++) {
70 const Page *p = &anm->pt[i];
71 if (p->nb_records > 0 && record >= p->base_record && record < p->base_record + p->nb_records)
75 return AVERROR_INVALIDDATA;
78 static int read_header(AVFormatContext *s,
79 AVFormatParameters *ap)
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 av_log_ask_for_sample(s, "max_pages != " AV_STRINGIFY(MAX_PAGES) "\n");
89 return AVERROR_INVALIDDATA;
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 = av_new_stream(s, 0);
102 return AVERROR(ENOMEM);
103 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
104 st->codec->codec_id = CODEC_ID_ANM;
105 st->codec->codec_tag = 0; /* no fourcc */
106 st->codec->width = avio_rl16(pb);
107 st->codec->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 av_set_pts_info(st, 64, 1, avio_rl16(pb));
134 /* color cycling and palette data */
135 st->codec->extradata_size = 16*8 + 4*256;
136 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
137 if (!st->codec->extradata) {
138 ret = AVERROR(ENOMEM);
139 goto close_and_return;
141 ret = avio_read(pb, st->codec->extradata, st->codec->extradata_size);
143 goto close_and_return;
145 /* read page table */
146 ret = avio_seek(pb, anm->page_table_offset, SEEK_SET);
148 goto close_and_return;
150 for (i = 0; i < MAX_PAGES; i++) {
151 Page *p = &anm->pt[i];
152 p->base_record = avio_rl16(pb);
153 p->nb_records = avio_rl16(pb);
154 p->size = avio_rl16(pb);
157 /* find page of first frame */
158 anm->page = find_record(anm, 0);
161 goto close_and_return;
168 av_log_ask_for_sample(s, NULL);
169 ret = AVERROR_INVALIDDATA;
172 av_close_input_stream(s);
176 static int read_packet(AVFormatContext *s,
179 AnmDemuxContext *anm = s->priv_data;
180 AVIOContext *pb = s->pb;
182 int tmp, record_size;
191 p = &anm->pt[anm->page];
193 /* parse page header */
194 if (anm->record < 0) {
195 avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16), SEEK_SET);
196 avio_skip(pb, 8 + 2*p->nb_records);
200 /* if we have fetched all records in this page, then find the
201 next page and repeat */
202 if (anm->record >= p->nb_records) {
203 anm->page = find_record(anm, p->base_record + p->nb_records);
210 /* fetch record size */
212 avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16) +
213 8 + anm->record * 2, SEEK_SET);
214 record_size = avio_rl16(pb);
215 avio_seek(pb, tmp, SEEK_SET);
218 pkt->size = av_get_packet(s->pb, pkt, record_size);
221 if (p->base_record + anm->record == 0)
222 pkt->flags |= AV_PKT_FLAG_KEY;
228 AVInputFormat ff_anm_demuxer = {
230 NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
231 sizeof(AnmDemuxContext),