forked from KolibriOS/kolibrios
ffmpeg-2.1.1: move directory
git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Sergey Semyonov (Serge)
229
contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavformat/anm.c
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229
contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavformat/anm.c
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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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#include "internal.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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{
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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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avio_skip(pb, 4); /* magic number */
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if (avio_rl16(pb) != MAX_PAGES) {
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avpriv_request_sample(s, "max_pages != " AV_STRINGIFY(MAX_PAGES));
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return AVERROR_PATCHWELCOME;
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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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avio_skip(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 = avformat_new_stream(s, NULL);
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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 = AV_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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avio_skip(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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avio_skip(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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avio_skip(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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avio_skip(pb, 32); /* record_types */
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st->nb_frames = avio_rl32(pb);
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avpriv_set_pts_info(st, 64, 1, avio_rl16(pb));
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avio_skip(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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return AVERROR(ENOMEM);
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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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return ret;
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/* read page table */
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ret = avio_seek(pb, anm->page_table_offset, SEEK_SET);
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if (ret < 0)
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return ret;
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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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return anm->page;
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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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avpriv_request_sample(s, "Invalid header element");
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return AVERROR_PATCHWELCOME;
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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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avio_seek(pb, anm->page_table_offset + MAX_PAGES*6 + (anm->page<<16), SEEK_SET);
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avio_skip(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 = avio_tell(pb);
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avio_seek(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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avio_seek(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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.name = "anm",
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.long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
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.priv_data_size = sizeof(AnmDemuxContext),
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.read_probe = probe,
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.read_header = read_header,
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.read_packet = read_packet,
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};
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