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flic.c
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1 /*
2  * FLI/FLC Animation File Demuxer
3  * Copyright (c) 2003 The FFmpeg Project
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * FLI/FLC file demuxer
25  * by Mike Melanson (melanson@pcisys.net)
26  * for more information on the .fli/.flc file format and all of its many
27  * variations, visit:
28  * http://www.compuphase.com/flic.htm
29  *
30  * This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also handles
31  * special FLIs from the PC games "Magic Carpet" and "X-COM: Terror from the Deep".
32  */
33 
35 #include "libavutil/intreadwrite.h"
36 #include "avformat.h"
37 #include "internal.h"
38 
39 #define FLIC_FILE_MAGIC_1 0xAF11
40 #define FLIC_FILE_MAGIC_2 0xAF12
41 #define FLIC_FILE_MAGIC_3 0xAF44 /* Flic Type for Extended FLX Format which
42  originated in Dave's Targa Animator (DTA) */
43 #define FLIC_CHUNK_MAGIC_1 0xF1FA
44 #define FLIC_CHUNK_MAGIC_2 0xF5FA
45 #define FLIC_MC_SPEED 5 /* speed for Magic Carpet game FLIs */
46 #define FLIC_DEFAULT_SPEED 5 /* for FLIs that have 0 speed */
47 #define FLIC_TFTD_CHUNK_AUDIO 0xAAAA /* Audio chunk. Used in Terror from the Deep.
48  Has 10 B extra header not accounted for in the chunk header */
49 #define FLIC_TFTD_SAMPLE_RATE 22050
50 
51 #define FLIC_HEADER_SIZE 128
52 #define FLIC_PREAMBLE_SIZE 6
53 
54 typedef struct FlicDemuxContext {
59 
60 static int flic_probe(AVProbeData *p)
61 {
62  int magic_number;
63 
64  if(p->buf_size < FLIC_HEADER_SIZE)
65  return 0;
66 
67  magic_number = AV_RL16(&p->buf[4]);
68  if ((magic_number != FLIC_FILE_MAGIC_1) &&
69  (magic_number != FLIC_FILE_MAGIC_2) &&
70  (magic_number != FLIC_FILE_MAGIC_3))
71  return 0;
72 
73  if(AV_RL16(&p->buf[0x10]) != FLIC_CHUNK_MAGIC_1){
74  if(AV_RL32(&p->buf[0x10]) > 2000)
75  return 0;
76  }
77 
78  if( AV_RL16(&p->buf[0x08]) > 4096
79  || AV_RL16(&p->buf[0x0A]) > 4096)
80  return 0;
81 
82 
83  return AVPROBE_SCORE_MAX - 1;
84 }
85 
87 {
88  FlicDemuxContext *flic = s->priv_data;
89  AVIOContext *pb = s->pb;
90  unsigned char header[FLIC_HEADER_SIZE];
91  AVStream *st, *ast;
92  int speed;
93  int magic_number;
94  unsigned char preamble[FLIC_PREAMBLE_SIZE];
95 
96  flic->frame_number = 0;
97 
98  /* load the whole header and pull out the width and height */
99  if (avio_read(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE)
100  return AVERROR(EIO);
101 
102  magic_number = AV_RL16(&header[4]);
103  speed = AV_RL32(&header[0x10]);
104  if (speed == 0)
105  speed = FLIC_DEFAULT_SPEED;
106 
107  /* initialize the decoder streams */
108  st = avformat_new_stream(s, NULL);
109  if (!st)
110  return AVERROR(ENOMEM);
111  flic->video_stream_index = st->index;
114  st->codec->codec_tag = 0; /* no fourcc */
115  st->codec->width = AV_RL16(&header[0x08]);
116  st->codec->height = AV_RL16(&header[0x0A]);
117 
118  if (!st->codec->width || !st->codec->height) {
119  /* Ugly hack needed for the following sample: */
120  /* http://samples.mplayerhq.hu/fli-flc/fli-bugs/specular.flc */
122  "File with no specified width/height. Trying 640x480.\n");
123  st->codec->width = 640;
124  st->codec->height = 480;
125  }
126 
127  /* send over the whole 128-byte FLIC header */
129  return AVERROR(ENOMEM);
130  memcpy(st->codec->extradata, header, FLIC_HEADER_SIZE);
131 
132  /* peek at the preamble to detect TFTD videos - they seem to always start with an audio chunk */
133  if (avio_read(pb, preamble, FLIC_PREAMBLE_SIZE) != FLIC_PREAMBLE_SIZE) {
134  av_log(s, AV_LOG_ERROR, "Failed to peek at preamble\n");
135  return AVERROR(EIO);
136  }
137 
138  avio_seek(pb, -FLIC_PREAMBLE_SIZE, SEEK_CUR);
139 
140  /* Time to figure out the framerate:
141  * If the first preamble's magic number is 0xAAAA then this file is from
142  * X-COM: Terror from the Deep. If on the other hand there is a FLIC chunk
143  * magic number at offset 0x10 assume this file is from Magic Carpet instead.
144  * If neither of the above is true then this is a normal FLIC file.
145  */
146  if (AV_RL16(&preamble[4]) == FLIC_TFTD_CHUNK_AUDIO) {
147  /* TFTD videos have an extra 22050 Hz 8-bit mono audio stream */
148  ast = avformat_new_stream(s, NULL);
149  if (!ast)
150  return AVERROR(ENOMEM);
151 
152  flic->audio_stream_index = ast->index;
153 
154  /* all audio frames are the same size, so use the size of the first chunk for block_align */
155  ast->codec->block_align = AV_RL32(&preamble[0]);
158  ast->codec->codec_tag = 0;
160  ast->codec->channels = 1;
161  ast->codec->bit_rate = st->codec->sample_rate * 8;
162  ast->codec->bits_per_coded_sample = 8;
164  ast->codec->extradata_size = 0;
165 
166  /* Since the header information is incorrect we have to figure out the
167  * framerate using block_align and the fact that the audio is 22050 Hz.
168  * We usually have two cases: 2205 -> 10 fps and 1470 -> 15 fps */
171  } else if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) {
172  avpriv_set_pts_info(st, 64, FLIC_MC_SPEED, 70);
173 
174  /* rewind the stream since the first chunk is at offset 12 */
175  avio_seek(pb, 12, SEEK_SET);
176 
177  /* send over abbreviated FLIC header chunk */
178  av_freep(&st->codec->extradata);
179  if (ff_alloc_extradata(st->codec, 12))
180  return AVERROR(ENOMEM);
181  memcpy(st->codec->extradata, header, 12);
182 
183  } else if (magic_number == FLIC_FILE_MAGIC_1) {
184  avpriv_set_pts_info(st, 64, speed, 70);
185  } else if ((magic_number == FLIC_FILE_MAGIC_2) ||
186  (magic_number == FLIC_FILE_MAGIC_3)) {
187  avpriv_set_pts_info(st, 64, speed, 1000);
188  } else {
189  av_log(s, AV_LOG_ERROR, "Invalid or unsupported magic chunk in file\n");
190  return AVERROR_INVALIDDATA;
191  }
192 
193  return 0;
194 }
195 
197  AVPacket *pkt)
198 {
199  FlicDemuxContext *flic = s->priv_data;
200  AVIOContext *pb = s->pb;
201  int packet_read = 0;
202  unsigned int size;
203  int magic;
204  int ret = 0;
205  unsigned char preamble[FLIC_PREAMBLE_SIZE];
206 
207  while (!packet_read) {
208 
209  if ((ret = avio_read(pb, preamble, FLIC_PREAMBLE_SIZE)) !=
211  ret = AVERROR(EIO);
212  break;
213  }
214 
215  size = AV_RL32(&preamble[0]);
216  magic = AV_RL16(&preamble[4]);
217 
218  if (((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) && size > FLIC_PREAMBLE_SIZE) {
219  if (av_new_packet(pkt, size)) {
220  ret = AVERROR(EIO);
221  break;
222  }
223  pkt->stream_index = flic->video_stream_index;
224  pkt->pts = flic->frame_number++;
225  pkt->pos = avio_tell(pb);
226  memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE);
227  ret = avio_read(pb, pkt->data + FLIC_PREAMBLE_SIZE,
228  size - FLIC_PREAMBLE_SIZE);
229  if (ret != size - FLIC_PREAMBLE_SIZE) {
230  av_free_packet(pkt);
231  ret = AVERROR(EIO);
232  }
233  packet_read = 1;
234  } else if (magic == FLIC_TFTD_CHUNK_AUDIO) {
235  if (av_new_packet(pkt, size)) {
236  ret = AVERROR(EIO);
237  break;
238  }
239 
240  /* skip useless 10B sub-header (yes, it's not accounted for in the chunk header) */
241  avio_skip(pb, 10);
242 
243  pkt->stream_index = flic->audio_stream_index;
244  pkt->pos = avio_tell(pb);
245  ret = avio_read(pb, pkt->data, size);
246 
247  if (ret != size) {
248  av_free_packet(pkt);
249  ret = AVERROR(EIO);
250  }
251 
252  packet_read = 1;
253  } else {
254  /* not interested in this chunk */
255  avio_skip(pb, size - 6);
256  }
257  }
258 
259  return ret;
260 }
261 
263  .name = "flic",
264  .long_name = NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation"),
265  .priv_data_size = sizeof(FlicDemuxContext),
269 };
#define FLIC_CHUNK_MAGIC_2
Definition: flic.c:44
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:280
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1187
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4006
#define FLIC_FILE_MAGIC_2
Definition: flic.c:40
int index
stream index in AVFormatContext
Definition: avformat.h:843
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:203
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:276
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:85
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2022
Format I/O context.
Definition: avformat.h:1272
#define FLIC_TFTD_CHUNK_AUDIO
Definition: flic.c:47
int frame_number
Definition: flic.c:57
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1355
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3672
uint8_t * data
Definition: avcodec.h:1162
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:365
static const uint8_t header[24]
Definition: sdr2.c:67
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2720
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:537
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:83
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
#define FLIC_FILE_MAGIC_3
Definition: flic.c:41
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2046
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int audio_stream_index
Definition: flic.c:56
int bit_rate
the average bitrate
Definition: avcodec.h:1305
audio channel layout utility functions
int video_stream_index
Definition: flic.c:55
static int flic_probe(AVProbeData *p)
Definition: flic.c:60
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
ret
Definition: avfilter.c:974
int width
picture width / height.
Definition: avcodec.h:1414
#define FLIC_TFTD_SAMPLE_RATE
Definition: flic.c:49
#define FLIC_MC_SPEED
Definition: flic.c:45
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:620
Stream structure.
Definition: avformat.h:842
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define FLIC_FILE_MAGIC_1
Definition: flic.c:39
enum AVMediaType codec_type
Definition: avcodec.h:1249
static int flic_read_header(AVFormatContext *s)
Definition: flic.c:86
enum AVCodecID codec_id
Definition: avcodec.h:1258
int sample_rate
samples per second
Definition: avcodec.h:1985
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
AVInputFormat ff_flic_demuxer
Definition: flic.c:262
#define FLIC_CHUNK_MAGIC_1
Definition: flic.c:43
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1273
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2864
int extradata_size
Definition: avcodec.h:1356
#define FLIC_PREAMBLE_SIZE
Definition: flic.c:52
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
#define FLIC_DEFAULT_SPEED
Definition: flic.c:46
int channels
number of audio channels
Definition: avcodec.h:1986
void * priv_data
Format private data.
Definition: avformat.h:1300
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
int stream_index
Definition: avcodec.h:1164
#define AV_CH_LAYOUT_MONO
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:85
This structure stores compressed data.
Definition: avcodec.h:1139
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1155
#define FLIC_HEADER_SIZE
Definition: flic.c:51
static int flic_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: flic.c:196