flicvideo.c
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1 /*
2  * FLI/FLC Animation Video Decoder
3  * Copyright (C) 2003, 2004 the ffmpeg project
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
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_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
67  pixel_ptr + n, pixel_limit); \
68  return -1; \
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 != 12 &&
87  avctx->extradata_size != 128) {
88  av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
89  return AVERROR_INVALIDDATA;
90  }
91 
92  s->avctx = avctx;
93 
94  s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
95 
96  depth = 0;
97  if (s->avctx->extradata_size == 12) {
98  /* special case for magic carpet FLIs */
100  depth = 8;
101  } else {
102  depth = AV_RL16(&fli_header[12]);
103  }
104 
105  if (depth == 0) {
106  depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
107  }
108 
109  if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
110  depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
111  }
112 
113  switch (depth) {
114  case 8 : avctx->pix_fmt = PIX_FMT_PAL8; break;
115  case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
116  case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
117  case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
118  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
119  return -1;
120  default :
121  av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
122  return -1;
123  }
124 
125  s->frame.data[0] = NULL;
126  s->new_palette = 0;
127 
128  return 0;
129 }
130 
132  void *data, int *data_size,
133  const uint8_t *buf, int buf_size)
134 {
135  FlicDecodeContext *s = avctx->priv_data;
136 
137  GetByteContext g2;
138  int stream_ptr_after_color_chunk;
139  int pixel_ptr;
140  int palette_ptr;
141  unsigned char palette_idx1;
142  unsigned char palette_idx2;
143 
144  unsigned int frame_size;
145  int num_chunks;
146 
147  unsigned int chunk_size;
148  int chunk_type;
149 
150  int i, j;
151 
152  int color_packets;
153  int color_changes;
154  int color_shift;
155  unsigned char r, g, b;
156 
157  int lines;
158  int compressed_lines;
159  int starting_line;
160  signed short line_packets;
161  int y_ptr;
162  int byte_run;
163  int pixel_skip;
164  int pixel_countdown;
165  unsigned char *pixels;
166  unsigned int pixel_limit;
167 
168  bytestream2_init(&g2, buf, buf_size);
169 
170  s->frame.reference = 1;
172  if (avctx->reget_buffer(avctx, &s->frame) < 0) {
173  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
174  return -1;
175  }
176 
177  pixels = s->frame.data[0];
178  pixel_limit = s->avctx->height * s->frame.linesize[0];
179  frame_size = bytestream2_get_le32(&g2);
180  bytestream2_skip(&g2, 2); /* skip the magic number */
181  num_chunks = bytestream2_get_le16(&g2);
182  bytestream2_skip(&g2, 8); /* skip padding */
183 
184  frame_size -= 16;
185 
186  /* iterate through the chunks */
187  while ((frame_size > 0) && (num_chunks > 0)) {
188  chunk_size = bytestream2_get_le32(&g2);
189  chunk_type = bytestream2_get_le16(&g2);
190 
191  switch (chunk_type) {
192  case FLI_256_COLOR:
193  case FLI_COLOR:
194  stream_ptr_after_color_chunk = bytestream2_tell(&g2) + chunk_size - 6;
195 
196  /* check special case: If this file is from the Magic Carpet
197  * game and uses 6-bit colors even though it reports 256-color
198  * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
199  * initialization) */
200  if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
201  color_shift = 0;
202  else
203  color_shift = 2;
204  /* set up the palette */
205  color_packets = bytestream2_get_le16(&g2);
206  palette_ptr = 0;
207  for (i = 0; i < color_packets; i++) {
208  /* first byte is how many colors to skip */
209  palette_ptr += bytestream2_get_byte(&g2);
210 
211  /* next byte indicates how many entries to change */
212  color_changes = bytestream2_get_byte(&g2);
213 
214  /* if there are 0 color changes, there are actually 256 */
215  if (color_changes == 0)
216  color_changes = 256;
217 
218  for (j = 0; j < color_changes; j++) {
219  unsigned int entry;
220 
221  /* wrap around, for good measure */
222  if ((unsigned)palette_ptr >= 256)
223  palette_ptr = 0;
224 
225  r = bytestream2_get_byte(&g2) << color_shift;
226  g = bytestream2_get_byte(&g2) << color_shift;
227  b = bytestream2_get_byte(&g2) << color_shift;
228  entry = (r << 16) | (g << 8) | b;
229  if (s->palette[palette_ptr] != entry)
230  s->new_palette = 1;
231  s->palette[palette_ptr++] = entry;
232  }
233  }
234 
235  /* color chunks sometimes have weird 16-bit alignment issues;
236  * therefore, take the hardline approach and skip
237  * to the value calculated w.r.t. the size specified by the color
238  * chunk header */
239  if (stream_ptr_after_color_chunk - bytestream2_tell(&g2) > 0)
240  bytestream2_skip(&g2, stream_ptr_after_color_chunk - bytestream2_tell(&g2));
241 
242  break;
243 
244  case FLI_DELTA:
245  y_ptr = 0;
246  compressed_lines = bytestream2_get_le16(&g2);
247  while (compressed_lines > 0) {
248  line_packets = bytestream2_get_le16(&g2);
249  if ((line_packets & 0xC000) == 0xC000) {
250  // line skip opcode
251  line_packets = -line_packets;
252  y_ptr += line_packets * s->frame.linesize[0];
253  } else if ((line_packets & 0xC000) == 0x4000) {
254  av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
255  } else if ((line_packets & 0xC000) == 0x8000) {
256  // "last byte" opcode
257  pixel_ptr= y_ptr + s->frame.linesize[0] - 1;
258  CHECK_PIXEL_PTR(0);
259  pixels[pixel_ptr] = line_packets & 0xff;
260  } else {
261  compressed_lines--;
262  pixel_ptr = y_ptr;
263  CHECK_PIXEL_PTR(0);
264  pixel_countdown = s->avctx->width;
265  for (i = 0; i < line_packets; i++) {
266  /* account for the skip bytes */
267  pixel_skip = bytestream2_get_byte(&g2);
268  pixel_ptr += pixel_skip;
269  pixel_countdown -= pixel_skip;
270  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
271  if (byte_run < 0) {
272  byte_run = -byte_run;
273  palette_idx1 = bytestream2_get_byte(&g2);
274  palette_idx2 = bytestream2_get_byte(&g2);
275  CHECK_PIXEL_PTR(byte_run * 2);
276  for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
277  pixels[pixel_ptr++] = palette_idx1;
278  pixels[pixel_ptr++] = palette_idx2;
279  }
280  } else {
281  CHECK_PIXEL_PTR(byte_run * 2);
282  for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
283  pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
284  }
285  }
286  }
287 
288  y_ptr += s->frame.linesize[0];
289  }
290  }
291  break;
292 
293  case FLI_LC:
294  /* line compressed */
295  starting_line = bytestream2_get_le16(&g2);
296  y_ptr = 0;
297  y_ptr += starting_line * s->frame.linesize[0];
298 
299  compressed_lines = bytestream2_get_le16(&g2);
300  while (compressed_lines > 0) {
301  pixel_ptr = y_ptr;
302  CHECK_PIXEL_PTR(0);
303  pixel_countdown = s->avctx->width;
304  line_packets = bytestream2_get_byte(&g2);
305  if (line_packets > 0) {
306  for (i = 0; i < line_packets; i++) {
307  /* account for the skip bytes */
308  pixel_skip = bytestream2_get_byte(&g2);
309  pixel_ptr += pixel_skip;
310  pixel_countdown -= pixel_skip;
311  byte_run = sign_extend(bytestream2_get_byte(&g2),8);
312  if (byte_run > 0) {
313  CHECK_PIXEL_PTR(byte_run);
314  for (j = 0; j < byte_run; j++, pixel_countdown--) {
315  pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
316  }
317  } else if (byte_run < 0) {
318  byte_run = -byte_run;
319  palette_idx1 = bytestream2_get_byte(&g2);
320  CHECK_PIXEL_PTR(byte_run);
321  for (j = 0; j < byte_run; j++, pixel_countdown--) {
322  pixels[pixel_ptr++] = palette_idx1;
323  }
324  }
325  }
326  }
327 
328  y_ptr += s->frame.linesize[0];
329  compressed_lines--;
330  }
331  break;
332 
333  case FLI_BLACK:
334  /* set the whole frame to color 0 (which is usually black) */
335  memset(pixels, 0,
336  s->frame.linesize[0] * s->avctx->height);
337  break;
338 
339  case FLI_BRUN:
340  /* Byte run compression: This chunk type only occurs in the first
341  * FLI frame and it will update the entire frame. */
342  y_ptr = 0;
343  for (lines = 0; lines < s->avctx->height; lines++) {
344  pixel_ptr = y_ptr;
345  /* disregard the line packets; instead, iterate through all
346  * pixels on a row */
347  bytestream2_skip(&g2, 1);
348  pixel_countdown = s->avctx->width;
349  while (pixel_countdown > 0) {
350  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
351  if (byte_run > 0) {
352  palette_idx1 = bytestream2_get_byte(&g2);
353  CHECK_PIXEL_PTR(byte_run);
354  for (j = 0; j < byte_run; j++) {
355  pixels[pixel_ptr++] = palette_idx1;
356  pixel_countdown--;
357  if (pixel_countdown < 0)
358  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
359  pixel_countdown, lines);
360  }
361  } else { /* copy bytes if byte_run < 0 */
362  byte_run = -byte_run;
363  CHECK_PIXEL_PTR(byte_run);
364  for (j = 0; j < byte_run; j++) {
365  pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
366  pixel_countdown--;
367  if (pixel_countdown < 0)
368  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
369  pixel_countdown, lines);
370  }
371  }
372  }
373 
374  y_ptr += s->frame.linesize[0];
375  }
376  break;
377 
378  case FLI_COPY:
379  /* copy the chunk (uncompressed frame) */
380  if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
381  av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
382  "bigger than image, skipping chunk\n", chunk_size - 6);
383  bytestream2_skip(&g2, chunk_size - 6);
384  } else {
385  for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
386  y_ptr += s->frame.linesize[0]) {
387  bytestream2_get_buffer(&g2, &pixels[y_ptr],
388  s->avctx->width);
389  }
390  }
391  break;
392 
393  case FLI_MINI:
394  /* some sort of a thumbnail? disregard this chunk... */
395  bytestream2_skip(&g2, chunk_size - 6);
396  break;
397 
398  default:
399  av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
400  break;
401  }
402 
403  frame_size -= chunk_size;
404  num_chunks--;
405  }
406 
407  /* by the end of the chunk, the stream ptr should equal the frame
408  * size (minus 1, possibly); if it doesn't, issue a warning */
409  if ((bytestream2_get_bytes_left(&g2) != 0) &&
410  (bytestream2_get_bytes_left(&g2) != 1))
411  av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
412  "and final chunk ptr = %d\n", buf_size,
413  buf_size - bytestream2_get_bytes_left(&g2));
414 
415  /* make the palette available on the way out */
416  memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
417  if (s->new_palette) {
418  s->frame.palette_has_changed = 1;
419  s->new_palette = 0;
420  }
421 
422  *data_size=sizeof(AVFrame);
423  *(AVFrame*)data = s->frame;
424 
425  return buf_size;
426 }
427 
429  void *data, int *data_size,
430  const uint8_t *buf, int buf_size)
431 {
432  /* Note, the only difference between the 15Bpp and 16Bpp */
433  /* Format is the pixel format, the packets are processed the same. */
434  FlicDecodeContext *s = avctx->priv_data;
435 
436  GetByteContext g2;
437  int pixel_ptr;
438  unsigned char palette_idx1;
439 
440  unsigned int frame_size;
441  int num_chunks;
442 
443  unsigned int chunk_size;
444  int chunk_type;
445 
446  int i, j;
447 
448  int lines;
449  int compressed_lines;
450  signed short line_packets;
451  int y_ptr;
452  int byte_run;
453  int pixel_skip;
454  int pixel_countdown;
455  unsigned char *pixels;
456  int pixel;
457  unsigned int pixel_limit;
458 
459  bytestream2_init(&g2, buf, buf_size);
460 
461  s->frame.reference = 1;
463  if (avctx->reget_buffer(avctx, &s->frame) < 0) {
464  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
465  return -1;
466  }
467 
468  pixels = s->frame.data[0];
469  pixel_limit = s->avctx->height * s->frame.linesize[0];
470 
471  frame_size = bytestream2_get_le32(&g2);
472  bytestream2_skip(&g2, 2); /* skip the magic number */
473  num_chunks = bytestream2_get_le16(&g2);
474  bytestream2_skip(&g2, 8); /* skip padding */
475 
476  frame_size -= 16;
477 
478  /* iterate through the chunks */
479  while ((frame_size > 0) && (num_chunks > 0)) {
480  chunk_size = bytestream2_get_le32(&g2);
481  chunk_type = bytestream2_get_le16(&g2);
482 
483  switch (chunk_type) {
484  case FLI_256_COLOR:
485  case FLI_COLOR:
486  /* For some reason, it seems that non-palettized flics do
487  * include one of these chunks in their first frame.
488  * Why I do not know, it seems rather extraneous. */
489 /* av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
490  bytestream2_skip(&g2, chunk_size - 6);
491  break;
492 
493  case FLI_DELTA:
494  case FLI_DTA_LC:
495  y_ptr = 0;
496  compressed_lines = bytestream2_get_le16(&g2);
497  while (compressed_lines > 0) {
498  line_packets = bytestream2_get_le16(&g2);
499  if (line_packets < 0) {
500  line_packets = -line_packets;
501  y_ptr += line_packets * s->frame.linesize[0];
502  } else {
503  compressed_lines--;
504  pixel_ptr = y_ptr;
505  CHECK_PIXEL_PTR(0);
506  pixel_countdown = s->avctx->width;
507  for (i = 0; i < line_packets; i++) {
508  /* account for the skip bytes */
509  pixel_skip = bytestream2_get_byte(&g2);
510  pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
511  pixel_countdown -= pixel_skip;
512  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
513  if (byte_run < 0) {
514  byte_run = -byte_run;
515  pixel = bytestream2_get_le16(&g2);
516  CHECK_PIXEL_PTR(2 * byte_run);
517  for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
518  *((signed short*)(&pixels[pixel_ptr])) = pixel;
519  pixel_ptr += 2;
520  }
521  } else {
522  CHECK_PIXEL_PTR(2 * byte_run);
523  for (j = 0; j < byte_run; j++, pixel_countdown--) {
524  *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
525  pixel_ptr += 2;
526  }
527  }
528  }
529 
530  y_ptr += s->frame.linesize[0];
531  }
532  }
533  break;
534 
535  case FLI_LC:
536  av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
537  bytestream2_skip(&g2, chunk_size - 6);
538  break;
539 
540  case FLI_BLACK:
541  /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
542  memset(pixels, 0x0000,
543  s->frame.linesize[0] * s->avctx->height);
544  break;
545 
546  case FLI_BRUN:
547  y_ptr = 0;
548  for (lines = 0; lines < s->avctx->height; lines++) {
549  pixel_ptr = y_ptr;
550  /* disregard the line packets; instead, iterate through all
551  * pixels on a row */
552  bytestream2_skip(&g2, 1);
553  pixel_countdown = (s->avctx->width * 2);
554 
555  while (pixel_countdown > 0) {
556  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
557  if (byte_run > 0) {
558  palette_idx1 = bytestream2_get_byte(&g2);
559  CHECK_PIXEL_PTR(byte_run);
560  for (j = 0; j < byte_run; j++) {
561  pixels[pixel_ptr++] = palette_idx1;
562  pixel_countdown--;
563  if (pixel_countdown < 0)
564  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
565  pixel_countdown, lines);
566  }
567  } else { /* copy bytes if byte_run < 0 */
568  byte_run = -byte_run;
569  CHECK_PIXEL_PTR(byte_run);
570  for (j = 0; j < byte_run; j++) {
571  palette_idx1 = bytestream2_get_byte(&g2);
572  pixels[pixel_ptr++] = palette_idx1;
573  pixel_countdown--;
574  if (pixel_countdown < 0)
575  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
576  pixel_countdown, lines);
577  }
578  }
579  }
580 
581  /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
582  * This does not give us any good oportunity to perform word endian conversion
583  * during decompression. So if it is required (i.e., this is not a LE target, we do
584  * a second pass over the line here, swapping the bytes.
585  */
586 #if HAVE_BIGENDIAN
587  pixel_ptr = y_ptr;
588  pixel_countdown = s->avctx->width;
589  while (pixel_countdown > 0) {
590  *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
591  pixel_ptr += 2;
592  }
593 #endif
594  y_ptr += s->frame.linesize[0];
595  }
596  break;
597 
598  case FLI_DTA_BRUN:
599  y_ptr = 0;
600  for (lines = 0; lines < s->avctx->height; lines++) {
601  pixel_ptr = y_ptr;
602  /* disregard the line packets; instead, iterate through all
603  * pixels on a row */
604  bytestream2_skip(&g2, 1);
605  pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
606 
607  while (pixel_countdown > 0) {
608  byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
609  if (byte_run > 0) {
610  pixel = bytestream2_get_le16(&g2);
611  CHECK_PIXEL_PTR(2 * byte_run);
612  for (j = 0; j < byte_run; j++) {
613  *((signed short*)(&pixels[pixel_ptr])) = pixel;
614  pixel_ptr += 2;
615  pixel_countdown--;
616  if (pixel_countdown < 0)
617  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
618  pixel_countdown);
619  }
620  } else { /* copy pixels if byte_run < 0 */
621  byte_run = -byte_run;
622  CHECK_PIXEL_PTR(2 * byte_run);
623  for (j = 0; j < byte_run; j++) {
624  *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
625  pixel_ptr += 2;
626  pixel_countdown--;
627  if (pixel_countdown < 0)
628  av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
629  pixel_countdown);
630  }
631  }
632  }
633 
634  y_ptr += s->frame.linesize[0];
635  }
636  break;
637 
638  case FLI_COPY:
639  case FLI_DTA_COPY:
640  /* copy the chunk (uncompressed frame) */
641  if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
642  av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
643  "bigger than image, skipping chunk\n", chunk_size - 6);
644  bytestream2_skip(&g2, chunk_size - 6);
645  } else {
646 
647  for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
648  y_ptr += s->frame.linesize[0]) {
649 
650  pixel_countdown = s->avctx->width;
651  pixel_ptr = 0;
652  while (pixel_countdown > 0) {
653  *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
654  pixel_ptr += 2;
655  pixel_countdown--;
656  }
657  }
658  }
659  break;
660 
661  case FLI_MINI:
662  /* some sort of a thumbnail? disregard this chunk... */
663  bytestream2_skip(&g2, chunk_size - 6);
664  break;
665 
666  default:
667  av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
668  break;
669  }
670 
671  frame_size -= chunk_size;
672  num_chunks--;
673  }
674 
675  /* by the end of the chunk, the stream ptr should equal the frame
676  * size (minus 1, possibly); if it doesn't, issue a warning */
677  if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
678  av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
679  "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
680 
681 
682  *data_size=sizeof(AVFrame);
683  *(AVFrame*)data = s->frame;
684 
685  return buf_size;
686 }
687 
689  void *data, int *data_size,
690  const uint8_t *buf, int buf_size)
691 {
692  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
693  return -1;
694 }
695 
697  void *data, int *data_size,
698  AVPacket *avpkt)
699 {
700  const uint8_t *buf = avpkt->data;
701  int buf_size = avpkt->size;
702  if (avctx->pix_fmt == PIX_FMT_PAL8) {
703  return flic_decode_frame_8BPP(avctx, data, data_size,
704  buf, buf_size);
705  }
706  else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
707  (avctx->pix_fmt == PIX_FMT_RGB565)) {
708  return flic_decode_frame_15_16BPP(avctx, data, data_size,
709  buf, buf_size);
710  }
711  else if (avctx->pix_fmt == PIX_FMT_BGR24) {
712  return flic_decode_frame_24BPP(avctx, data, data_size,
713  buf, buf_size);
714  }
715 
716  /* Should not get here, ever as the pix_fmt is processed */
717  /* in flic_decode_init and the above if should deal with */
718  /* the finite set of possibilites allowable by here. */
719  /* But in case we do, just error out. */
720  av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
721  return -1;
722 }
723 
724 
726 {
727  FlicDecodeContext *s = avctx->priv_data;
728 
729  if (s->frame.data[0])
730  avctx->release_buffer(avctx, &s->frame);
731 
732  return 0;
733 }
734 
736  .name = "flic",
737  .type = AVMEDIA_TYPE_VIDEO,
738  .id = CODEC_ID_FLIC,
739  .priv_data_size = sizeof(FlicDecodeContext),
743  .capabilities = CODEC_CAP_DR1,
744  .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
745 };