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ffmpeg / libavformat / anm.c @ b7effd4e

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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
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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 (or AVERROR_xxx code) */
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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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    AVIOContext *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 (avio_rl16(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   = avio_rl16(pb);
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    anm->nb_records = avio_rl32(pb);
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    url_fskip(pb, 2); /* max records per page */
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    anm->page_table_offset = avio_rl16(pb);
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    if (avio_rl32(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 = AVMEDIA_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      = avio_rl16(pb);
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    st->codec->height     = avio_rl16(pb);
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    if (avio_r8(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 (avio_r8(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 (avio_r8(pb) != 0)
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        goto invalid;
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    if (avio_r8(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 (avio_r8(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 = avio_rl32(pb);
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    av_set_pts_info(st, 64, 1, avio_rl16(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 = avio_read(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 = avio_rl16(pb);
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        p->nb_records  = avio_rl16(pb);
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        p->size        = avio_rl16(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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    AVIOContext *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 anm->page;
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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 = avio_rl16(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 |= AV_PKT_FLAG_KEY;
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    anm->record++;
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    return 0;
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}
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AVInputFormat ff_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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};