/* * Deluxe Paint Animation demuxer * Copyright (c) 2009 Peter Ross * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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" #include "internal.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) { AnmDemuxContext *anm = s->priv_data; AVIOContext *pb = s->pb; AVStream *st; int i, ret; avio_skip(pb, 4); /* magic number */ if (avio_rl16(pb) != MAX_PAGES) { av_log_ask_for_sample(s, "max_pages != " AV_STRINGIFY(MAX_PAGES) "\n"); return AVERROR_PATCHWELCOME; } anm->nb_pages = avio_rl16(pb); anm->nb_records = avio_rl32(pb); avio_skip(pb, 2); /* max records per page */ anm->page_table_offset = avio_rl16(pb); if (avio_rl32(pb) != ANIM_TAG) return AVERROR_INVALIDDATA; /* video stream */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = AV_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_skip(pb, 1); /* 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_skip(pb, 1); /* last_delta_valid */ if (avio_r8(pb) != 0) goto invalid; if (avio_r8(pb) != 1) goto invalid; avio_skip(pb, 1); /* other recs per frame */ if (avio_r8(pb) != 1) goto invalid; avio_skip(pb, 32); /* record_types */ st->nb_frames = avio_rl32(pb); avpriv_set_pts_info(st, 64, 1, avio_rl16(pb)); avio_skip(pb, 58); /* 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) { return AVERROR(ENOMEM); } ret = avio_read(pb, st->codec->extradata, st->codec->extradata_size); if (ret < 0) return ret; /* read page table */ ret = avio_seek(pb, anm->page_table_offset, SEEK_SET); if (ret < 0) return ret; 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) { return anm->page; } anm->record = -1; return 0; invalid: av_log_ask_for_sample(s, NULL); return AVERROR_PATCHWELCOME; } static int read_packet(AVFormatContext *s, AVPacket *pkt) { AnmDemuxContext *anm = s->priv_data; AVIOContext *pb = s->pb; Page *p; int tmp, record_size; if (s->pb->eof_reached) 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_skip(pb, 8 + 2*p->nb_records); 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 = avio_tell(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 = { .name = "anm", .long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"), .priv_data_size = sizeof(AnmDemuxContext), .read_probe = probe, .read_header = read_header, .read_packet = read_packet, };