FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
flicvideo.c
Go to the documentation of this file.
1 /*
2  * FLI/FLC Animation Video Decoder
3  * Copyright (C) 2003, 2004 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  * Autodesk Animator FLI/FLC Video Decoder
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 decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24
31  * colorspace data, depending on the FLC. To use this decoder, be
32  * sure that your demuxer sends the FLI file header to the decoder via
33  * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
34  * large. The only exception is for FLI files from the game "Magic Carpet",
35  * in which the header is only 12 bytes.
36  */
37 
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 
42 #include "libavutil/intreadwrite.h"
43 #include "avcodec.h"
44 #include "bytestream.h"
45 #include "mathops.h"
46 
47 #define FLI_256_COLOR 4
48 #define FLI_DELTA 7
49 #define FLI_COLOR 11
50 #define FLI_LC 12
51 #define FLI_BLACK 13
52 #define FLI_BRUN 15
53 #define FLI_COPY 16
54 #define FLI_MINI 18
55 #define FLI_DTA_BRUN 25
56 #define FLI_DTA_COPY 26
57 #define FLI_DTA_LC 27
58 
59 #define FLI_TYPE_CODE (0xAF11)
60 #define FLC_FLX_TYPE_CODE (0xAF12)
61 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
62 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
63 
64 #define CHECK_PIXEL_PTR(n) \
65  if (pixel_ptr + n > pixel_limit) { \
66  av_log (s->avctx, AV_LOG_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \
67  pixel_ptr + n, pixel_limit); \
68  return AVERROR_INVALIDDATA; \
69  } \
70 
71 typedef struct FlicDecodeContext {
74 
75  unsigned int palette[256];
77  int fli_type; /* either 0xAF11 or 0xAF12, affects palette resolution */
79 
81 {
82  FlicDecodeContext *s = avctx->priv_data;
83  unsigned char *fli_header = (unsigned char *)avctx->extradata;
84  int depth;
85 
86  if (avctx->extradata_size != 0 &&
87  avctx->extradata_size != 12 &&
88  avctx->extradata_size != 128 &&
89  avctx->extradata_size != 256 &&
90  avctx->extradata_size != 904 &&
91  avctx->extradata_size != 1024) {
92  av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size);
93  return AVERROR_INVALIDDATA;
94  }
95 
96  s->avctx = avctx;
97 
98  if (s->avctx->extradata_size == 12) {
99  /* special case for magic carpet FLIs */
101  depth = 8;
102  } else if (avctx->extradata_size == 1024) {
103  uint8_t *ptr = avctx->extradata;
104  int i;
105 
106  for (i = 0; i < 256; i++) {
107  s->palette[i] = AV_RL32(ptr);
108  ptr += 4;
109  }
110  depth = 8;
111  /* FLI in MOV, see e.g. FFmpeg trac issue #626 */
112  } else if (avctx->extradata_size == 0 ||
113  avctx->extradata_size == 256 ||
114  /* see FFmpeg ticket #1234 */
115  avctx->extradata_size == 904) {
116  s->fli_type = FLI_TYPE_CODE;
117  depth = 8;
118  } else {
119  s->fli_type = AV_RL16(&fli_header[4]);
120  depth = AV_RL16(&fli_header[12]);
121  }
122 
123  if (depth == 0) {
124  depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
125  }
126 
127  if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
128  depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
129  }
130 
131  switch (depth) {
132  case 8 : avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
133  case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
134  case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;
135  case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
136  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
137  return AVERROR_PATCHWELCOME;
138  default :
139  av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
140  return AVERROR_INVALIDDATA;
141  }
142 
144  s->frame.data[0] = NULL;
145  s->new_palette = 0;
146 
147  return 0;
148 }
149 
151  void *data, int *got_frame,
152  const uint8_t *buf, int buf_size)
153 {
154  FlicDecodeContext *s = avctx->priv_data;
155 
156  GetByteContext g2;
157  int pixel_ptr;
158  int palette_ptr;
159  unsigned char palette_idx1;
160  unsigned char palette_idx2;
161 
162  unsigned int frame_size;
163  int num_chunks;
164 
165  unsigned int chunk_size;
166  int chunk_type;
167 
168  int i, j, ret;
169 
170  int color_packets;
171  int color_changes;
172  int color_shift;
173  unsigned char r, g, b;
174 
175  int lines;
176  int compressed_lines;
177  int starting_line;
178  signed short line_packets;
179  int y_ptr;
180  int byte_run;
181  int pixel_skip;
182  int pixel_countdown;
183  unsigned char *pixels;
184  unsigned int pixel_limit;
185 
186  bytestream2_init(&g2, buf, buf_size);
187 
188  s->frame.reference = 3;
190  if ((ret = avctx->reget_buffer(avctx, &s->frame)) < 0) {
191  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
192  return ret;
193  }
194 
195  pixels = s->frame.data[0];
196  pixel_limit = s->avctx->height * s->frame.linesize[0];
197  if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + FF_INPUT_BUFFER_PADDING_SIZE))
198  return AVERROR_INVALIDDATA;
199  frame_size = bytestream2_get_le32(&g2);
200  if (frame_size > buf_size)
201  frame_size = buf_size;
202  bytestream2_skip(&g2, 2); /* skip the magic number */
203  num_chunks = bytestream2_get_le16(&g2);
204  bytestream2_skip(&g2, 8); /* skip padding */
205 
206  frame_size -= 16;
207 
208  /* iterate through the chunks */
209  while ((frame_size >= 6) && (num_chunks > 0)) {
210  int stream_ptr_after_chunk;
211  chunk_size = bytestream2_get_le32(&g2);
212  if (chunk_size > frame_size) {
213  av_log(avctx, AV_LOG_WARNING,
214  "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
215  chunk_size = frame_size;
216  }
217  stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
218 
219  chunk_type = bytestream2_get_le16(&g2);
220 
221  switch (chunk_type) {
222  case FLI_256_COLOR:
223  case FLI_COLOR:
224  /* check special case: If this file is from the Magic Carpet
225  * game and uses 6-bit colors even though it reports 256-color
226  * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
227  * initialization) */
228  if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
229  color_shift = 0;
230  else
231  color_shift = 2;
232  /* set up the palette */
233  color_packets = bytestream2_get_le16(&g2);
234  palette_ptr = 0;
235  for (i = 0; i < color_packets; i++) {
236  /* first byte is how many colors to skip */
237  palette_ptr += bytestream2_get_byte(&g2);
238 
239  /* next byte indicates how many entries to change */
240  color_changes = bytestream2_get_byte(&g2);
241 
242  /* if there are 0 color changes, there are actually 256 */
243  if (color_changes == 0)
244  color_changes = 256;
245 
246  if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk)
247  break;
248 
249  for (j = 0; j < color_changes; j++) {
250  unsigned int entry;
251 
252  /* wrap around, for good measure */
253  if ((unsigned)palette_ptr >= 256)
254  palette_ptr = 0;
255 
256  r = bytestream2_get_byte(&g2) << color_shift;
257  g = bytestream2_get_byte(&g2) << color_shift;
258  b = bytestream2_get_byte(&g2) << color_shift;
259  entry = 0xFFU << 24 | r << 16 | g << 8 | b;
260  if (color_shift == 2)
261  entry |= entry >> 6 & 0x30303;
262  if (s->palette[palette_ptr] != entry)
263  s->new_palette = 1;
264  s->palette[palette_ptr++] = entry;
265  }
266  }
267  break;
268 
269  case FLI_DELTA:
270  y_ptr = 0;
271  compressed_lines = bytestream2_get_le16(&g2);
272  while (compressed_lines > 0) {
273  if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
274  break;
275  line_packets = bytestream2_get_le16(&g2);
276  if ((line_packets & 0xC000) == 0xC000) {
277  // line skip opcode
278  line_packets = -line_packets;
279  y_ptr += line_packets * s->frame.linesize[0];
280  } else if ((line_packets & 0xC000) == 0x4000) {
281  av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
282  } else if ((line_packets & 0xC000) == 0x8000) {
283  // "last byte" opcode
284  pixel_ptr= y_ptr + s->frame.linesize[0] - 1;
285  CHECK_PIXEL_PTR(0);
286  pixels[pixel_ptr] = line_packets & 0xff;
287  } else {
288  compressed_lines--;
289  pixel_ptr = y_ptr;
290  CHECK_PIXEL_PTR(0);
291  pixel_countdown = s->avctx->width;
292  for (i = 0; i < line_packets; i++) {
293  if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
294  break;
295  /* account for the skip bytes */
296  pixel_skip = bytestream2_get_byte(&g2);
297  pixel_ptr += pixel_skip;
298  pixel_countdown -= pixel_skip;
299  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
300  if (byte_run < 0) {
301  byte_run = -byte_run;
302  palette_idx1 = bytestream2_get_byte(&g2);
303  palette_idx2 = bytestream2_get_byte(&g2);
304  CHECK_PIXEL_PTR(byte_run * 2);
305  for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
306  pixels[pixel_ptr++] = palette_idx1;
307  pixels[pixel_ptr++] = palette_idx2;
308  }
309  } else {
310  CHECK_PIXEL_PTR(byte_run * 2);
311  if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk)
312  break;
313  for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
314  pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
315  }
316  }
317  }
318 
319  y_ptr += s->frame.linesize[0];
320  }
321  }
322  break;
323 
324  case FLI_LC:
325  /* line compressed */
326  starting_line = bytestream2_get_le16(&g2);
327  y_ptr = 0;
328  y_ptr += starting_line * s->frame.linesize[0];
329 
330  compressed_lines = bytestream2_get_le16(&g2);
331  while (compressed_lines > 0) {
332  pixel_ptr = y_ptr;
333  CHECK_PIXEL_PTR(0);
334  pixel_countdown = s->avctx->width;
335  if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
336  break;
337  line_packets = bytestream2_get_byte(&g2);
338  if (line_packets > 0) {
339  for (i = 0; i < line_packets; i++) {
340  /* account for the skip bytes */
341  if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
342  break;
343  pixel_skip = bytestream2_get_byte(&g2);
344  pixel_ptr += pixel_skip;
345  pixel_countdown -= pixel_skip;
346  byte_run = sign_extend(bytestream2_get_byte(&g2),8);
347  if (byte_run > 0) {
348  CHECK_PIXEL_PTR(byte_run);
349  if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
350  break;
351  for (j = 0; j < byte_run; j++, pixel_countdown--) {
352  pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
353  }
354  } else if (byte_run < 0) {
355  byte_run = -byte_run;
356  palette_idx1 = bytestream2_get_byte(&g2);
357  CHECK_PIXEL_PTR(byte_run);
358  for (j = 0; j < byte_run; j++, pixel_countdown--) {
359  pixels[pixel_ptr++] = palette_idx1;
360  }
361  }
362  }
363  }
364 
365  y_ptr += s->frame.linesize[0];
366  compressed_lines--;
367  }
368  break;
369 
370  case FLI_BLACK:
371  /* set the whole frame to color 0 (which is usually black) */
372  memset(pixels, 0,
373  s->frame.linesize[0] * s->avctx->height);
374  break;
375 
376  case FLI_BRUN:
377  /* Byte run compression: This chunk type only occurs in the first
378  * FLI frame and it will update the entire frame. */
379  y_ptr = 0;
380  for (lines = 0; lines < s->avctx->height; lines++) {
381  pixel_ptr = y_ptr;
382  /* disregard the line packets; instead, iterate through all
383  * pixels on a row */
384  bytestream2_skip(&g2, 1);
385  pixel_countdown = s->avctx->width;
386  while (pixel_countdown > 0) {
387  if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
388  break;
389  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
390  if (!byte_run) {
391  av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n");
392  return AVERROR_INVALIDDATA;
393  }
394 
395  if (byte_run > 0) {
396  palette_idx1 = bytestream2_get_byte(&g2);
397  CHECK_PIXEL_PTR(byte_run);
398  for (j = 0; j < byte_run; j++) {
399  pixels[pixel_ptr++] = palette_idx1;
400  pixel_countdown--;
401  if (pixel_countdown < 0)
402  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
403  pixel_countdown, lines);
404  }
405  } else { /* copy bytes if byte_run < 0 */
406  byte_run = -byte_run;
407  CHECK_PIXEL_PTR(byte_run);
408  if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
409  break;
410  for (j = 0; j < byte_run; j++) {
411  pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
412  pixel_countdown--;
413  if (pixel_countdown < 0)
414  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
415  pixel_countdown, lines);
416  }
417  }
418  }
419 
420  y_ptr += s->frame.linesize[0];
421  }
422  break;
423 
424  case FLI_COPY:
425  /* copy the chunk (uncompressed frame) */
426  if (chunk_size - 6 != s->avctx->width * s->avctx->height) {
427  av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
428  "has incorrect size, skipping chunk\n", chunk_size - 6);
429  bytestream2_skip(&g2, chunk_size - 6);
430  } else {
431  for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
432  y_ptr += s->frame.linesize[0]) {
433  bytestream2_get_buffer(&g2, &pixels[y_ptr],
434  s->avctx->width);
435  }
436  }
437  break;
438 
439  case FLI_MINI:
440  /* some sort of a thumbnail? disregard this chunk... */
441  break;
442 
443  default:
444  av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
445  break;
446  }
447 
448  if (stream_ptr_after_chunk - bytestream2_tell(&g2) > 0)
449  bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
450 
451  frame_size -= chunk_size;
452  num_chunks--;
453  }
454 
455  /* by the end of the chunk, the stream ptr should equal the frame
456  * size (minus 1 or 2, possibly); if it doesn't, issue a warning */
457  if (bytestream2_get_bytes_left(&g2) > 2)
458  av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
459  "and final chunk ptr = %d\n", buf_size,
460  buf_size - bytestream2_get_bytes_left(&g2));
461 
462  /* make the palette available on the way out */
463  memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
464  if (s->new_palette) {
465  s->frame.palette_has_changed = 1;
466  s->new_palette = 0;
467  }
468 
469  *got_frame = 1;
470  *(AVFrame*)data = s->frame;
471 
472  return buf_size;
473 }
474 
476  void *data, int *got_frame,
477  const uint8_t *buf, int buf_size)
478 {
479  /* Note, the only difference between the 15Bpp and 16Bpp */
480  /* Format is the pixel format, the packets are processed the same. */
481  FlicDecodeContext *s = avctx->priv_data;
482 
483  GetByteContext g2;
484  int pixel_ptr;
485  unsigned char palette_idx1;
486 
487  unsigned int frame_size;
488  int num_chunks;
489 
490  unsigned int chunk_size;
491  int chunk_type;
492 
493  int i, j, ret;
494 
495  int lines;
496  int compressed_lines;
497  signed short line_packets;
498  int y_ptr;
499  int byte_run;
500  int pixel_skip;
501  int pixel_countdown;
502  unsigned char *pixels;
503  int pixel;
504  unsigned int pixel_limit;
505 
506  bytestream2_init(&g2, buf, buf_size);
507 
508  s->frame.reference = 3;
510  if ((ret = avctx->reget_buffer(avctx, &s->frame)) < 0) {
511  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
512  return ret;
513  }
514 
515  pixels = s->frame.data[0];
516  pixel_limit = s->avctx->height * s->frame.linesize[0];
517 
518  frame_size = bytestream2_get_le32(&g2);
519  bytestream2_skip(&g2, 2); /* skip the magic number */
520  num_chunks = bytestream2_get_le16(&g2);
521  bytestream2_skip(&g2, 8); /* skip padding */
522  if (frame_size > buf_size)
523  frame_size = buf_size;
524 
525  frame_size -= 16;
526 
527  /* iterate through the chunks */
528  while ((frame_size > 0) && (num_chunks > 0)) {
529  int stream_ptr_after_chunk;
530  chunk_size = bytestream2_get_le32(&g2);
531  if (chunk_size > frame_size) {
532  av_log(avctx, AV_LOG_WARNING,
533  "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
534  chunk_size = frame_size;
535  }
536  stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
537 
538  chunk_type = bytestream2_get_le16(&g2);
539 
540 
541  switch (chunk_type) {
542  case FLI_256_COLOR:
543  case FLI_COLOR:
544  /* For some reason, it seems that non-palettized flics do
545  * include one of these chunks in their first frame.
546  * Why I do not know, it seems rather extraneous. */
547  av_dlog(avctx,
548  "Unexpected Palette chunk %d in non-palettized FLC\n",
549  chunk_type);
550  bytestream2_skip(&g2, chunk_size - 6);
551  break;
552 
553  case FLI_DELTA:
554  case FLI_DTA_LC:
555  y_ptr = 0;
556  compressed_lines = bytestream2_get_le16(&g2);
557  while (compressed_lines > 0) {
558  if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
559  break;
560  line_packets = bytestream2_get_le16(&g2);
561  if (line_packets < 0) {
562  line_packets = -line_packets;
563  y_ptr += line_packets * s->frame.linesize[0];
564  } else {
565  compressed_lines--;
566  pixel_ptr = y_ptr;
567  CHECK_PIXEL_PTR(0);
568  pixel_countdown = s->avctx->width;
569  for (i = 0; i < line_packets; i++) {
570  /* account for the skip bytes */
571  if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
572  break;
573  pixel_skip = bytestream2_get_byte(&g2);
574  pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
575  pixel_countdown -= pixel_skip;
576  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
577  if (byte_run < 0) {
578  byte_run = -byte_run;
579  pixel = bytestream2_get_le16(&g2);
580  CHECK_PIXEL_PTR(2 * byte_run);
581  for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
582  *((signed short*)(&pixels[pixel_ptr])) = pixel;
583  pixel_ptr += 2;
584  }
585  } else {
586  if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
587  break;
588  CHECK_PIXEL_PTR(2 * byte_run);
589  for (j = 0; j < byte_run; j++, pixel_countdown--) {
590  *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
591  pixel_ptr += 2;
592  }
593  }
594  }
595 
596  y_ptr += s->frame.linesize[0];
597  }
598  }
599  break;
600 
601  case FLI_LC:
602  av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
603  bytestream2_skip(&g2, chunk_size - 6);
604  break;
605 
606  case FLI_BLACK:
607  /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
608  memset(pixels, 0x0000,
609  s->frame.linesize[0] * s->avctx->height);
610  break;
611 
612  case FLI_BRUN:
613  y_ptr = 0;
614  for (lines = 0; lines < s->avctx->height; lines++) {
615  pixel_ptr = y_ptr;
616  /* disregard the line packets; instead, iterate through all
617  * pixels on a row */
618  bytestream2_skip(&g2, 1);
619  pixel_countdown = (s->avctx->width * 2);
620 
621  while (pixel_countdown > 0) {
622  if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
623  break;
624  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
625  if (byte_run > 0) {
626  palette_idx1 = bytestream2_get_byte(&g2);
627  CHECK_PIXEL_PTR(byte_run);
628  for (j = 0; j < byte_run; j++) {
629  pixels[pixel_ptr++] = palette_idx1;
630  pixel_countdown--;
631  if (pixel_countdown < 0)
632  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
633  pixel_countdown, lines);
634  }
635  } else { /* copy bytes if byte_run < 0 */
636  byte_run = -byte_run;
637  if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
638  break;
639  CHECK_PIXEL_PTR(byte_run);
640  for (j = 0; j < byte_run; j++) {
641  palette_idx1 = bytestream2_get_byte(&g2);
642  pixels[pixel_ptr++] = palette_idx1;
643  pixel_countdown--;
644  if (pixel_countdown < 0)
645  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
646  pixel_countdown, lines);
647  }
648  }
649  }
650 
651  /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
652  * This does not give us any good opportunity to perform word endian conversion
653  * during decompression. So if it is required (i.e., this is not a LE target, we do
654  * a second pass over the line here, swapping the bytes.
655  */
656 #if HAVE_BIGENDIAN
657  pixel_ptr = y_ptr;
658  pixel_countdown = s->avctx->width;
659  while (pixel_countdown > 0) {
660  *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
661  pixel_ptr += 2;
662  }
663 #endif
664  y_ptr += s->frame.linesize[0];
665  }
666  break;
667 
668  case FLI_DTA_BRUN:
669  y_ptr = 0;
670  for (lines = 0; lines < s->avctx->height; lines++) {
671  pixel_ptr = y_ptr;
672  /* disregard the line packets; instead, iterate through all
673  * pixels on a row */
674  bytestream2_skip(&g2, 1);
675  pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
676 
677  while (pixel_countdown > 0) {
678  if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
679  break;
680  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
681  if (byte_run > 0) {
682  pixel = bytestream2_get_le16(&g2);
683  CHECK_PIXEL_PTR(2 * byte_run);
684  for (j = 0; j < byte_run; j++) {
685  *((signed short*)(&pixels[pixel_ptr])) = pixel;
686  pixel_ptr += 2;
687  pixel_countdown--;
688  if (pixel_countdown < 0)
689  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
690  pixel_countdown);
691  }
692  } else { /* copy pixels if byte_run < 0 */
693  byte_run = -byte_run;
694  if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)
695  break;
696  CHECK_PIXEL_PTR(2 * byte_run);
697  for (j = 0; j < byte_run; j++) {
698  *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
699  pixel_ptr += 2;
700  pixel_countdown--;
701  if (pixel_countdown < 0)
702  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
703  pixel_countdown);
704  }
705  }
706  }
707 
708  y_ptr += s->frame.linesize[0];
709  }
710  break;
711 
712  case FLI_COPY:
713  case FLI_DTA_COPY:
714  /* copy the chunk (uncompressed frame) */
715  if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
716  av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
717  "bigger than image, skipping chunk\n", chunk_size - 6);
718  bytestream2_skip(&g2, chunk_size - 6);
719  } else {
720 
721  for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
722  y_ptr += s->frame.linesize[0]) {
723 
724  pixel_countdown = s->avctx->width;
725  pixel_ptr = 0;
726  while (pixel_countdown > 0) {
727  *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
728  pixel_ptr += 2;
729  pixel_countdown--;
730  }
731  }
732  }
733  break;
734 
735  case FLI_MINI:
736  /* some sort of a thumbnail? disregard this chunk... */
737  bytestream2_skip(&g2, chunk_size - 6);
738  break;
739 
740  default:
741  av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
742  break;
743  }
744 
745  frame_size -= chunk_size;
746  num_chunks--;
747  }
748 
749  /* by the end of the chunk, the stream ptr should equal the frame
750  * size (minus 1, possibly); if it doesn't, issue a warning */
751  if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
752  av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
753  "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
754 
755 
756  *got_frame = 1;
757  *(AVFrame*)data = s->frame;
758 
759  return buf_size;
760 }
761 
763  void *data, int *got_frame,
764  const uint8_t *buf, int buf_size)
765 {
766  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
767  return AVERROR_PATCHWELCOME;
768 }
769 
771  void *data, int *got_frame,
772  AVPacket *avpkt)
773 {
774  const uint8_t *buf = avpkt->data;
775  int buf_size = avpkt->size;
776  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
777  return flic_decode_frame_8BPP(avctx, data, got_frame,
778  buf, buf_size);
779  }
780  else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) ||
781  (avctx->pix_fmt == AV_PIX_FMT_RGB565)) {
782  return flic_decode_frame_15_16BPP(avctx, data, got_frame,
783  buf, buf_size);
784  }
785  else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
786  return flic_decode_frame_24BPP(avctx, data, got_frame,
787  buf, buf_size);
788  }
789 
790  /* Should not get here, ever as the pix_fmt is processed */
791  /* in flic_decode_init and the above if should deal with */
792  /* the finite set of possibilites allowable by here. */
793  /* But in case we do, just error out. */
794  av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
795  return AVERROR_BUG;
796 }
797 
798 
800 {
801  FlicDecodeContext *s = avctx->priv_data;
802 
803  if (s->frame.data[0])
804  avctx->release_buffer(avctx, &s->frame);
805 
806  return 0;
807 }
808 
810  .name = "flic",
811  .type = AVMEDIA_TYPE_VIDEO,
812  .id = AV_CODEC_ID_FLIC,
813  .priv_data_size = sizeof(FlicDecodeContext),
817  .capabilities = CODEC_CAP_DR1,
818  .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
819 };