mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 21118 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
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/*
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* Deluxe Paint Animation demuxer |
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* Copyright (c) 2009 Peter Ross |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file libavformat/anm.c |
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* Deluxe Paint Animation demuxer |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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typedef struct { |
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int base_record; |
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unsigned int nb_records; |
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int size; |
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} Page; |
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typedef struct { |
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unsigned int nb_pages; /** total pages in file */ |
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unsigned int nb_records; /** total records in file */ |
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int page_table_offset; |
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#define MAX_PAGES 256 /** Deluxe Paint hardcoded value */ |
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Page pt[MAX_PAGES]; /** page table */ |
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int page; /** current page */ |
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int record; /** current record (with in page) */ |
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} AnmDemuxContext; |
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#define LPF_TAG MKTAG('L','P','F',' ') |
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#define ANIM_TAG MKTAG('A','N','I','M') |
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static int probe(AVProbeData *p) |
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{ |
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/* verify tags and video dimensions */ |
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if (AV_RL32(&p->buf[0]) == LPF_TAG && |
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AV_RL32(&p->buf[16]) == ANIM_TAG && |
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AV_RL16(&p->buf[20]) && AV_RL16(&p->buf[22])) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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/**
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* @return page containing the requested record or AVERROR_XXX |
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*/ |
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static int find_record(const AnmDemuxContext *anm, int record) |
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{ |
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int i; |
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if (record >= anm->nb_records) |
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return AVERROR_EOF; |
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for (i = 0; i < MAX_PAGES; i++) { |
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const Page *p = &anm->pt[i]; |
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if (p->nb_records > 0 && record >= p->base_record && record < p->base_record + p->nb_records) |
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return i; |
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} |
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return AVERROR_INVALIDDATA; |
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} |
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static int read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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AnmDemuxContext *anm = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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AVStream *st; |
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int i, ret; |
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url_fskip(pb, 4); /* magic number */ |
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if (get_le16(pb) != MAX_PAGES) { |
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av_log_ask_for_sample(s, "max_pages != " AV_STRINGIFY(MAX_PAGES) "\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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anm->nb_pages = get_le16(pb); |
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anm->nb_records = get_le32(pb); |
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url_fskip(pb, 2); /* max records per page */ |
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anm->page_table_offset = get_le16(pb); |
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if (get_le32(pb) != ANIM_TAG) |
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return AVERROR_INVALIDDATA; |
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/* video stream */ |
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st = av_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = CODEC_TYPE_VIDEO; |
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st->codec->codec_id = CODEC_ID_ANM; |
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st->codec->codec_tag = 0; /* no fourcc */ |
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st->codec->width = get_le16(pb); |
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st->codec->height = get_le16(pb); |
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if (get_byte(pb) != 0) |
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goto invalid; |
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url_fskip(pb, 1); /* frame rate multiplier info */ |
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/* ignore last delta record (used for looping) */ |
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if (get_byte(pb)) /* has_last_delta */ |
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anm->nb_records = FFMAX(anm->nb_records - 1, 0); |
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url_fskip(pb, 1); /* last_delta_valid */ |
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if (get_byte(pb) != 0) |
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goto invalid; |
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if (get_byte(pb) != 1) |
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goto invalid; |
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url_fskip(pb, 1); /* other recs per frame */ |
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if (get_byte(pb) != 1) |
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goto invalid; |
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url_fskip(pb, 32); /* record_types */ |
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st->nb_frames = get_le32(pb); |
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av_set_pts_info(st, 64, 1, get_le16(pb)); |
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url_fskip(pb, 58); |
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/* color cycling and palette data */ |
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st->codec->extradata_size = 16*8 + 4*256; |
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st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!st->codec->extradata) { |
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ret = AVERROR(ENOMEM); |
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goto close_and_return; |
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} |
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ret = get_buffer(pb, st->codec->extradata, st->codec->extradata_size); |
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if (ret < 0) |
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goto close_and_return; |
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/* read page table */ |
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ret = url_fseek(pb, anm->page_table_offset, SEEK_SET); |
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if (ret < 0) |
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goto close_and_return; |
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for (i = 0; i < MAX_PAGES; i++) { |
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Page *p = &anm->pt[i]; |
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p->base_record = get_le16(pb); |
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p->nb_records = get_le16(pb); |
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p->size = get_le16(pb); |
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} |
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/* find page of first frame */ |
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anm->page = find_record(anm, 0); |
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if (anm->page < 0) { |
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ret = anm->page; |
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goto close_and_return; |
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} |
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anm->record = -1; |
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return 0; |
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invalid: |
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av_log_ask_for_sample(s, NULL); |
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ret = AVERROR_INVALIDDATA; |
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close_and_return: |
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av_close_input_stream(s); |
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return ret; |
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} |
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static int read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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AnmDemuxContext *anm = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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Page *p; |
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int tmp, record_size; |
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if (url_feof(s->pb)) |
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return AVERROR(EIO); |
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if (anm->page < 0) |
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return 0; |
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repeat: |
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p = &anm->pt[anm->page]; |
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/* parse page header */ |
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if (anm->record < 0) { |
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url_fseek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16), SEEK_SET); |
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url_fskip(pb, 8 + 2*p->nb_records); |
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anm->record = 0; |
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} |
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/* if we have fetched all records in this page, then find the
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next page and repeat */ |
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if (anm->record >= p->nb_records) { |
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anm->page = find_record(anm, p->base_record + p->nb_records); |
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if (anm->page < 0) |
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return anm->page; |
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anm->record = -1; |
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goto repeat; |
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} |
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/* fetch record size */ |
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tmp = url_ftell(pb); |
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url_fseek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16) + |
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8 + anm->record * 2, SEEK_SET); |
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record_size = get_le16(pb); |
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url_fseek(pb, tmp, SEEK_SET); |
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/* fetch record */ |
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pkt->size = av_get_packet(s->pb, pkt, record_size); |
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if (pkt->size < 0) |
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return pkt->size; |
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if (p->base_record + anm->record == 0) |
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pkt->flags |= PKT_FLAG_KEY; |
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anm->record++; |
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return 0; |
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} |
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AVInputFormat anm_demuxer = { |
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"anm", |
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NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"), |
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sizeof(AnmDemuxContext), |
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probe, |
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read_header, |
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read_packet, |
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}; |
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