flicvideo: fix invalid reads
[libav.git] / libavcodec / flicvideo.c
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
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_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
67 pixel_ptr + n, pixel_limit); \
68 return -1; \
69 } \
70
71 typedef struct FlicDecodeContext {
72 AVCodecContext *avctx;
73 AVFrame frame;
74
75 unsigned int palette[256];
76 int new_palette;
77 int fli_type; /* either 0xAF11 or 0xAF12, affects palette resolution */
78 } FlicDecodeContext;
79
80 static av_cold int flic_decode_init(AVCodecContext *avctx)
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 */
99 s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
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
131 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
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;
171 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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
428 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
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;
462 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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
688 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
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
696 static int flic_decode_frame(AVCodecContext *avctx,
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
725 static av_cold int flic_decode_end(AVCodecContext *avctx)
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
735 AVCodec ff_flic_decoder = {
736 .name = "flic",
737 .type = AVMEDIA_TYPE_VIDEO,
738 .id = CODEC_ID_FLIC,
739 .priv_data_size = sizeof(FlicDecodeContext),
740 .init = flic_decode_init,
741 .close = flic_decode_end,
742 .decode = flic_decode_frame,
743 .capabilities = CODEC_CAP_DR1,
744 .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
745 };