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/*
* FLI/FLC Animation File Demuxer
* Copyright (c) 2003 The ffmpeg Project
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavformat/flic.c
* FLI/FLC file demuxer
* by Mike Melanson (melanson@pcisys.net)
* for more information on the .fli/.flc file format and all of its many
* variations, visit:
* http://www.compuphase.com/flic.htm
*
* This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also
* handles special FLIs from the PC game "Magic Carpet".
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#define FLIC_FILE_MAGIC_1 0xAF11
#define FLIC_FILE_MAGIC_2 0xAF12
#define FLIC_FILE_MAGIC_3 0xAF44 /* Flic Type for Extended FLX Format which
originated in Dave's Targa Animator (DTA) */
#define FLIC_CHUNK_MAGIC_1 0xF1FA
#define FLIC_CHUNK_MAGIC_2 0xF5FA
#define FLIC_MC_SPEED 5 /* speed for Magic Carpet game FLIs */
#define FLIC_DEFAULT_SPEED 5 /* for FLIs that have 0 speed */
#define FLIC_HEADER_SIZE 128
#define FLIC_PREAMBLE_SIZE 6
typedef struct FlicDemuxContext {
int video_stream_index;
int frame_number;
} FlicDemuxContext;
static int flic_probe(AVProbeData *p)
{
int magic_number;
if(p->buf_size < FLIC_HEADER_SIZE)
return 0;
magic_number = AV_RL16(&p->buf[4]);
if ((magic_number != FLIC_FILE_MAGIC_1) &&
(magic_number != FLIC_FILE_MAGIC_2) &&
(magic_number != FLIC_FILE_MAGIC_3))
return 0;
if(AV_RL16(&p->buf[0x10]) != FLIC_CHUNK_MAGIC_1){
if(AV_RL32(&p->buf[0x10]) > 2000)
return 0;
}
if( AV_RL16(&p->buf[0x08]) > 4096
|| AV_RL16(&p->buf[0x0A]) > 4096)
return 0;
return AVPROBE_SCORE_MAX;
}
static int flic_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
FlicDemuxContext *flic = s->priv_data;
ByteIOContext *pb = s->pb;
unsigned char header[FLIC_HEADER_SIZE];
AVStream *st;
int speed;
int magic_number;
flic->frame_number = 0;
/* load the whole header and pull out the width and height */
if (get_buffer(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE)
return AVERROR(EIO);
magic_number = AV_RL16(&header[4]);
speed = AV_RL32(&header[0x10]);
if (speed == 0)
speed = FLIC_DEFAULT_SPEED;
/* initialize the decoder streams */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
flic->video_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_FLIC;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = AV_RL16(&header[0x08]);
st->codec->height = AV_RL16(&header[0x0A]);
if (!st->codec->width || !st->codec->height) {
/* Ugly hack needed for the following sample: */
/* http://samples.mplayerhq.hu/fli-flc/fli-bugs/specular.flc */
av_log(s, AV_LOG_WARNING,
"File with no specified width/height. Trying 640x480.\n");
st->codec->width = 640;
st->codec->height = 480;
}
/* send over the whole 128-byte FLIC header */
st->codec->extradata_size = FLIC_HEADER_SIZE;
st->codec->extradata = av_malloc(FLIC_HEADER_SIZE);
memcpy(st->codec->extradata, header, FLIC_HEADER_SIZE);
/* Time to figure out the framerate: If there is a FLIC chunk magic
* number at offset 0x10, assume this is from the Bullfrog game,
* Magic Carpet. */
if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) {
av_set_pts_info(st, 64, FLIC_MC_SPEED, 70);
/* rewind the stream since the first chunk is at offset 12 */
url_fseek(pb, 12, SEEK_SET);
/* send over abbreviated FLIC header chunk */
av_free(st->codec->extradata);
st->codec->extradata_size = 12;
st->codec->extradata = av_malloc(12);
memcpy(st->codec->extradata, header, 12);
} else if (magic_number == FLIC_FILE_MAGIC_1) {
av_set_pts_info(st, 64, speed, 70);
} else if ((magic_number == FLIC_FILE_MAGIC_2) ||
(magic_number == FLIC_FILE_MAGIC_3)) {
av_set_pts_info(st, 64, speed, 1000);
} else {
av_log(s, AV_LOG_INFO, "Invalid or unsupported magic chunk in file\n");
return AVERROR_INVALIDDATA;
}
return 0;
}
static int flic_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
FlicDemuxContext *flic = s->priv_data;
ByteIOContext *pb = s->pb;
int packet_read = 0;
unsigned int size;
int magic;
int ret = 0;
unsigned char preamble[FLIC_PREAMBLE_SIZE];
while (!packet_read) {
if ((ret = get_buffer(pb, preamble, FLIC_PREAMBLE_SIZE)) !=
FLIC_PREAMBLE_SIZE) {
ret = AVERROR(EIO);
break;
}
size = AV_RL32(&preamble[0]);
magic = AV_RL16(&preamble[4]);
if (((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) && size > FLIC_PREAMBLE_SIZE) {
if (av_new_packet(pkt, size)) {
ret = AVERROR(EIO);
break;
}
pkt->stream_index = flic->video_stream_index;
pkt->pts = flic->frame_number++;
pkt->pos = url_ftell(pb);
memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE);
ret = get_buffer(pb, pkt->data + FLIC_PREAMBLE_SIZE,
size - FLIC_PREAMBLE_SIZE);
if (ret != size - FLIC_PREAMBLE_SIZE) {
av_free_packet(pkt);
ret = AVERROR(EIO);
}
packet_read = 1;
} else {
/* not interested in this chunk */
url_fseek(pb, size - 6, SEEK_CUR);
}
}
return ret;
}
AVInputFormat flic_demuxer = {
"flic",
NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation format"),
sizeof(FlicDemuxContext),
flic_probe,
flic_read_header,
flic_read_packet,
};
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