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ffmpeg/libavformat/flic.c

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/*
* FLI/FLC Animation File Demuxer
* Copyright (c) 2003 The ffmpeg Project
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file 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 "avformat.h"
#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
(((uint8_t*)(x))[2] << 16) | \
(((uint8_t*)(x))[1] << 8) | \
((uint8_t*)(x))[0])
#define FLIC_FILE_MAGIC_1 0xAF11
#define FLIC_FILE_MAGIC_2 0xAF12
#define FLIC_CHUNK_MAGIC_1 0xF1FA
#define FLIC_CHUNK_MAGIC_2 0xF5FA
#define FLIC_MC_PTS_INC 6000 /* pts increment for Magic Carpet game FLIs */
#define FLIC_DEFAULT_PTS_INC 6000 /* for FLIs that have 0 speed */
#define FLIC_HEADER_SIZE 128
#define FLIC_PREAMBLE_SIZE 6
typedef struct FlicDemuxContext {
int frame_pts_inc;
int64_t pts;
int video_stream_index;
} FlicDemuxContext;
static int flic_probe(AVProbeData *p)
{
int magic_number;
if (p->buf_size < 6)
return 0;
magic_number = LE_16(&p->buf[4]);
if ((magic_number != FLIC_FILE_MAGIC_1) &&
(magic_number != FLIC_FILE_MAGIC_2))
return 0;
return AVPROBE_SCORE_MAX;
}
static int flic_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data;
ByteIOContext *pb = &s->pb;
unsigned char header[FLIC_HEADER_SIZE];
AVStream *st;
int speed;
int magic_number;
flic->pts = 0;
/* load the whole header and pull out the width and height */
if (get_buffer(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE)
return -EIO;
magic_number = LE_16(&header[4]);
speed = LE_32(&header[0x10]);
/* initialize the decoder streams */
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
flic->video_stream_index = st->index;
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_FLIC;
st->codec.codec_tag = 0; /* no fourcc */
st->codec.width = LE_16(&header[0x08]);
st->codec.height = LE_16(&header[0x0A]);
if (!st->codec.width || !st->codec.height)
return AVERROR_INVALIDDATA;
/* 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);
/* set the pts reference (1 pts = 1/90000) */
s->pts_num = 1;
s->pts_den = 90000;
/* 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 (LE_16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) {
flic->frame_pts_inc = FLIC_MC_PTS_INC;
/* 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) {
/*
* in this case, the speed (n) is number of 1/70s ticks between frames:
*
* pts n * frame #
* -------- = ----------- => pts = n * (90000/70) * frame #
* 90000 70
*
* therefore, the frame pts increment = n * 1285.7
*/
flic->frame_pts_inc = speed * 1285.7;
} else if (magic_number == FLIC_FILE_MAGIC_2) {
/*
* in this case, the speed (n) is number of milliseconds between frames:
*
* pts n * frame #
* -------- = ----------- => pts = n * 90 * frame #
* 90000 1000
*
* therefore, the frame pts increment = n * 90
*/
flic->frame_pts_inc = speed * 90;
} else
return AVERROR_INVALIDDATA;
if (flic->frame_pts_inc == 0)
flic->frame_pts_inc = FLIC_DEFAULT_PTS_INC;
return 0;
}
static int flic_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
FlicDemuxContext *flic = (FlicDemuxContext *)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 = -EIO;
break;
}
size = LE_32(&preamble[0]);
magic = LE_16(&preamble[4]);
if ((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) {
if (av_new_packet(pkt, size)) {
ret = -EIO;
break;
}
pkt->stream_index = flic->video_stream_index;
pkt->pts = flic->pts;
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 = -EIO;
}
flic->pts += flic->frame_pts_inc;
packet_read = 1;
} else {
/* not interested in this chunk */
url_fseek(pb, size - 6, SEEK_CUR);
}
}
return ret;
}
static int flic_read_close(AVFormatContext *s)
{
// FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data;
return 0;
}
static AVInputFormat flic_iformat = {
"flic",
"FLI/FLC animation format",
sizeof(FlicDemuxContext),
flic_probe,
flic_read_header,
flic_read_packet,
flic_read_close,
};
int flic_init(void)
{
av_register_input_format(&flic_iformat);
return 0;
}
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