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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 |
* 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 games "Magic Carpet" and "X-COM: Terror from the Deep". |
*/ |
|
#include "libavutil/channel_layout.h" |
#include "libavutil/intreadwrite.h" |
#include "avformat.h" |
#include "internal.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_TFTD_CHUNK_AUDIO 0xAAAA /* Audio chunk. Used in Terror from the Deep. |
Has 10 B extra header not accounted for in the chunk header */ |
#define FLIC_TFTD_SAMPLE_RATE 22050 |
|
#define FLIC_HEADER_SIZE 128 |
#define FLIC_PREAMBLE_SIZE 6 |
|
typedef struct FlicDemuxContext { |
int video_stream_index; |
int audio_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 - 1; |
} |
|
static int flic_read_header(AVFormatContext *s) |
{ |
FlicDemuxContext *flic = s->priv_data; |
AVIOContext *pb = s->pb; |
unsigned char header[FLIC_HEADER_SIZE]; |
AVStream *st, *ast; |
int speed; |
int magic_number; |
unsigned char preamble[FLIC_PREAMBLE_SIZE]; |
|
flic->frame_number = 0; |
|
/* load the whole header and pull out the width and height */ |
if (avio_read(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 = avformat_new_stream(s, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
flic->video_stream_index = st->index; |
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
st->codec->codec_id = AV_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 */ |
if (ff_alloc_extradata(st->codec, FLIC_HEADER_SIZE)) |
return AVERROR(ENOMEM); |
memcpy(st->codec->extradata, header, FLIC_HEADER_SIZE); |
|
/* peek at the preamble to detect TFTD videos - they seem to always start with an audio chunk */ |
if (avio_read(pb, preamble, FLIC_PREAMBLE_SIZE) != FLIC_PREAMBLE_SIZE) { |
av_log(s, AV_LOG_ERROR, "Failed to peek at preamble\n"); |
return AVERROR(EIO); |
} |
|
avio_seek(pb, -FLIC_PREAMBLE_SIZE, SEEK_CUR); |
|
/* Time to figure out the framerate: |
* If the first preamble's magic number is 0xAAAA then this file is from |
* X-COM: Terror from the Deep. If on the other hand there is a FLIC chunk |
* magic number at offset 0x10 assume this file is from Magic Carpet instead. |
* If neither of the above is true then this is a normal FLIC file. |
*/ |
if (AV_RL16(&preamble[4]) == FLIC_TFTD_CHUNK_AUDIO) { |
/* TFTD videos have an extra 22050 Hz 8-bit mono audio stream */ |
ast = avformat_new_stream(s, NULL); |
if (!ast) |
return AVERROR(ENOMEM); |
|
flic->audio_stream_index = ast->index; |
|
/* all audio frames are the same size, so use the size of the first chunk for block_align */ |
ast->codec->block_align = AV_RL32(&preamble[0]); |
ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
ast->codec->codec_id = AV_CODEC_ID_PCM_U8; |
ast->codec->codec_tag = 0; |
ast->codec->sample_rate = FLIC_TFTD_SAMPLE_RATE; |
ast->codec->channels = 1; |
ast->codec->bit_rate = st->codec->sample_rate * 8; |
ast->codec->bits_per_coded_sample = 8; |
ast->codec->channel_layout = AV_CH_LAYOUT_MONO; |
ast->codec->extradata_size = 0; |
|
/* Since the header information is incorrect we have to figure out the |
* framerate using block_align and the fact that the audio is 22050 Hz. |
* We usually have two cases: 2205 -> 10 fps and 1470 -> 15 fps */ |
avpriv_set_pts_info(st, 64, ast->codec->block_align, FLIC_TFTD_SAMPLE_RATE); |
avpriv_set_pts_info(ast, 64, 1, FLIC_TFTD_SAMPLE_RATE); |
} else if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) { |
avpriv_set_pts_info(st, 64, FLIC_MC_SPEED, 70); |
|
/* rewind the stream since the first chunk is at offset 12 */ |
avio_seek(pb, 12, SEEK_SET); |
|
/* send over abbreviated FLIC header chunk */ |
av_free(st->codec->extradata); |
if (ff_alloc_extradata(st->codec, 12)) |
return AVERROR(ENOMEM); |
memcpy(st->codec->extradata, header, 12); |
|
} else if (magic_number == FLIC_FILE_MAGIC_1) { |
avpriv_set_pts_info(st, 64, speed, 70); |
} else if ((magic_number == FLIC_FILE_MAGIC_2) || |
(magic_number == FLIC_FILE_MAGIC_3)) { |
avpriv_set_pts_info(st, 64, speed, 1000); |
} else { |
av_log(s, AV_LOG_ERROR, "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; |
AVIOContext *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 = avio_read(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 = avio_tell(pb); |
memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE); |
ret = avio_read(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 if (magic == FLIC_TFTD_CHUNK_AUDIO) { |
if (av_new_packet(pkt, size)) { |
ret = AVERROR(EIO); |
break; |
} |
|
/* skip useless 10B sub-header (yes, it's not accounted for in the chunk header) */ |
avio_skip(pb, 10); |
|
pkt->stream_index = flic->audio_stream_index; |
pkt->pos = avio_tell(pb); |
ret = avio_read(pb, pkt->data, size); |
|
if (ret != size) { |
av_free_packet(pkt); |
ret = AVERROR(EIO); |
} |
|
packet_read = 1; |
} else { |
/* not interested in this chunk */ |
avio_skip(pb, size - 6); |
} |
} |
|
return ret; |
} |
|
AVInputFormat ff_flic_demuxer = { |
.name = "flic", |
.long_name = NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation"), |
.priv_data_size = sizeof(FlicDemuxContext), |
.read_probe = flic_probe, |
.read_header = flic_read_header, |
.read_packet = flic_read_packet, |
}; |