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2ba45a60 DM |
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 "internal.h" | |
46 | #include "mathops.h" | |
47 | ||
48 | #define FLI_256_COLOR 4 | |
49 | #define FLI_DELTA 7 | |
50 | #define FLI_COLOR 11 | |
51 | #define FLI_LC 12 | |
52 | #define FLI_BLACK 13 | |
53 | #define FLI_BRUN 15 | |
54 | #define FLI_COPY 16 | |
55 | #define FLI_MINI 18 | |
56 | #define FLI_DTA_BRUN 25 | |
57 | #define FLI_DTA_COPY 26 | |
58 | #define FLI_DTA_LC 27 | |
59 | ||
60 | #define FLI_TYPE_CODE (0xAF11) | |
61 | #define FLC_FLX_TYPE_CODE (0xAF12) | |
62 | #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */ | |
63 | #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13) | |
64 | ||
65 | #define CHECK_PIXEL_PTR(n) \ | |
66 | if (pixel_ptr + n > pixel_limit) { \ | |
67 | av_log (s->avctx, AV_LOG_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \ | |
68 | pixel_ptr + n, pixel_limit); \ | |
69 | return AVERROR_INVALIDDATA; \ | |
70 | } \ | |
71 | ||
72 | typedef struct FlicDecodeContext { | |
73 | AVCodecContext *avctx; | |
74 | AVFrame *frame; | |
75 | ||
76 | unsigned int palette[256]; | |
77 | int new_palette; | |
78 | int fli_type; /* either 0xAF11 or 0xAF12, affects palette resolution */ | |
79 | } FlicDecodeContext; | |
80 | ||
81 | static av_cold int flic_decode_init(AVCodecContext *avctx) | |
82 | { | |
83 | FlicDecodeContext *s = avctx->priv_data; | |
84 | unsigned char *fli_header = (unsigned char *)avctx->extradata; | |
85 | int depth; | |
86 | ||
87 | if (avctx->extradata_size != 0 && | |
88 | avctx->extradata_size != 12 && | |
89 | avctx->extradata_size != 128 && | |
90 | avctx->extradata_size != 256 && | |
91 | avctx->extradata_size != 904 && | |
92 | avctx->extradata_size != 1024) { | |
93 | av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size); | |
94 | return AVERROR_INVALIDDATA; | |
95 | } | |
96 | ||
97 | s->avctx = avctx; | |
98 | ||
99 | if (s->avctx->extradata_size == 12) { | |
100 | /* special case for magic carpet FLIs */ | |
101 | s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE; | |
102 | depth = 8; | |
103 | } else if (avctx->extradata_size == 1024) { | |
104 | uint8_t *ptr = avctx->extradata; | |
105 | int i; | |
106 | ||
107 | for (i = 0; i < 256; i++) { | |
108 | s->palette[i] = AV_RL32(ptr); | |
109 | ptr += 4; | |
110 | } | |
111 | depth = 8; | |
112 | /* FLI in MOV, see e.g. FFmpeg trac issue #626 */ | |
113 | } else if (avctx->extradata_size == 0 || | |
114 | avctx->extradata_size == 256 || | |
115 | /* see FFmpeg ticket #1234 */ | |
116 | avctx->extradata_size == 904) { | |
117 | s->fli_type = FLI_TYPE_CODE; | |
118 | depth = 8; | |
119 | } else { | |
120 | s->fli_type = AV_RL16(&fli_header[4]); | |
121 | depth = AV_RL16(&fli_header[12]); | |
122 | } | |
123 | ||
124 | if (depth == 0) { | |
125 | depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */ | |
126 | } | |
127 | ||
128 | if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) { | |
129 | depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */ | |
130 | } | |
131 | ||
132 | switch (depth) { | |
133 | case 8 : avctx->pix_fmt = AV_PIX_FMT_PAL8; break; | |
134 | case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break; | |
135 | case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break; | |
136 | case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */ | |
137 | avpriv_request_sample(avctx, "24Bpp FLC/FLX"); | |
138 | return AVERROR_PATCHWELCOME; | |
139 | default : | |
140 | av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth); | |
141 | return AVERROR_INVALIDDATA; | |
142 | } | |
143 | ||
144 | s->frame = av_frame_alloc(); | |
145 | if (!s->frame) | |
146 | return AVERROR(ENOMEM); | |
147 | ||
148 | s->new_palette = 0; | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int flic_decode_frame_8BPP(AVCodecContext *avctx, | |
154 | void *data, int *got_frame, | |
155 | const uint8_t *buf, int buf_size) | |
156 | { | |
157 | FlicDecodeContext *s = avctx->priv_data; | |
158 | ||
159 | GetByteContext g2; | |
160 | int pixel_ptr; | |
161 | int palette_ptr; | |
162 | unsigned char palette_idx1; | |
163 | unsigned char palette_idx2; | |
164 | ||
165 | unsigned int frame_size; | |
166 | int num_chunks; | |
167 | ||
168 | unsigned int chunk_size; | |
169 | int chunk_type; | |
170 | ||
171 | int i, j, ret; | |
172 | ||
173 | int color_packets; | |
174 | int color_changes; | |
175 | int color_shift; | |
176 | unsigned char r, g, b; | |
177 | ||
178 | int lines; | |
179 | int compressed_lines; | |
180 | int starting_line; | |
181 | signed short line_packets; | |
182 | int y_ptr; | |
183 | int byte_run; | |
184 | int pixel_skip; | |
185 | int pixel_countdown; | |
186 | unsigned char *pixels; | |
187 | unsigned int pixel_limit; | |
188 | ||
189 | bytestream2_init(&g2, buf, buf_size); | |
190 | ||
191 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) | |
192 | return ret; | |
193 | ||
194 | pixels = s->frame->data[0]; | |
195 | pixel_limit = s->avctx->height * s->frame->linesize[0]; | |
196 | if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + FF_INPUT_BUFFER_PADDING_SIZE)) | |
197 | return AVERROR_INVALIDDATA; | |
198 | frame_size = bytestream2_get_le32(&g2); | |
199 | if (frame_size > buf_size) | |
200 | frame_size = buf_size; | |
201 | bytestream2_skip(&g2, 2); /* skip the magic number */ | |
202 | num_chunks = bytestream2_get_le16(&g2); | |
203 | bytestream2_skip(&g2, 8); /* skip padding */ | |
204 | ||
205 | frame_size -= 16; | |
206 | ||
207 | /* iterate through the chunks */ | |
208 | while ((frame_size >= 6) && (num_chunks > 0) && | |
209 | bytestream2_get_bytes_left(&g2) >= 4) { | |
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 | if ((ret = av_frame_ref(data, s->frame)) < 0) | |
470 | return ret; | |
471 | ||
472 | *got_frame = 1; | |
473 | ||
474 | return buf_size; | |
475 | } | |
476 | ||
477 | static int flic_decode_frame_15_16BPP(AVCodecContext *avctx, | |
478 | void *data, int *got_frame, | |
479 | const uint8_t *buf, int buf_size) | |
480 | { | |
481 | /* Note, the only difference between the 15Bpp and 16Bpp */ | |
482 | /* Format is the pixel format, the packets are processed the same. */ | |
483 | FlicDecodeContext *s = avctx->priv_data; | |
484 | ||
485 | GetByteContext g2; | |
486 | int pixel_ptr; | |
487 | unsigned char palette_idx1; | |
488 | ||
489 | unsigned int frame_size; | |
490 | int num_chunks; | |
491 | ||
492 | unsigned int chunk_size; | |
493 | int chunk_type; | |
494 | ||
495 | int i, j, ret; | |
496 | ||
497 | int lines; | |
498 | int compressed_lines; | |
499 | signed short line_packets; | |
500 | int y_ptr; | |
501 | int byte_run; | |
502 | int pixel_skip; | |
503 | int pixel_countdown; | |
504 | unsigned char *pixels; | |
505 | int pixel; | |
506 | unsigned int pixel_limit; | |
507 | ||
508 | bytestream2_init(&g2, buf, buf_size); | |
509 | ||
510 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) | |
511 | return ret; | |
512 | ||
513 | pixels = s->frame->data[0]; | |
514 | pixel_limit = s->avctx->height * s->frame->linesize[0]; | |
515 | ||
516 | frame_size = bytestream2_get_le32(&g2); | |
517 | bytestream2_skip(&g2, 2); /* skip the magic number */ | |
518 | num_chunks = bytestream2_get_le16(&g2); | |
519 | bytestream2_skip(&g2, 8); /* skip padding */ | |
520 | if (frame_size > buf_size) | |
521 | frame_size = buf_size; | |
522 | ||
523 | frame_size -= 16; | |
524 | ||
525 | /* iterate through the chunks */ | |
526 | while ((frame_size > 0) && (num_chunks > 0) && | |
527 | bytestream2_get_bytes_left(&g2) >= 4) { | |
528 | int stream_ptr_after_chunk; | |
529 | chunk_size = bytestream2_get_le32(&g2); | |
530 | if (chunk_size > frame_size) { | |
531 | av_log(avctx, AV_LOG_WARNING, | |
532 | "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size); | |
533 | chunk_size = frame_size; | |
534 | } | |
535 | stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size; | |
536 | ||
537 | chunk_type = bytestream2_get_le16(&g2); | |
538 | ||
539 | ||
540 | switch (chunk_type) { | |
541 | case FLI_256_COLOR: | |
542 | case FLI_COLOR: | |
543 | /* For some reason, it seems that non-palettized flics do | |
544 | * include one of these chunks in their first frame. | |
545 | * Why I do not know, it seems rather extraneous. */ | |
546 | av_dlog(avctx, | |
547 | "Unexpected Palette chunk %d in non-palettized FLC\n", | |
548 | chunk_type); | |
549 | bytestream2_skip(&g2, chunk_size - 6); | |
550 | break; | |
551 | ||
552 | case FLI_DELTA: | |
553 | case FLI_DTA_LC: | |
554 | y_ptr = 0; | |
555 | compressed_lines = bytestream2_get_le16(&g2); | |
556 | while (compressed_lines > 0) { | |
557 | if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk) | |
558 | break; | |
559 | line_packets = bytestream2_get_le16(&g2); | |
560 | if (line_packets < 0) { | |
561 | line_packets = -line_packets; | |
562 | y_ptr += line_packets * s->frame->linesize[0]; | |
563 | } else { | |
564 | compressed_lines--; | |
565 | pixel_ptr = y_ptr; | |
566 | CHECK_PIXEL_PTR(0); | |
567 | pixel_countdown = s->avctx->width; | |
568 | for (i = 0; i < line_packets; i++) { | |
569 | /* account for the skip bytes */ | |
570 | if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk) | |
571 | break; | |
572 | pixel_skip = bytestream2_get_byte(&g2); | |
573 | pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */ | |
574 | pixel_countdown -= pixel_skip; | |
575 | byte_run = sign_extend(bytestream2_get_byte(&g2), 8); | |
576 | if (byte_run < 0) { | |
577 | byte_run = -byte_run; | |
578 | pixel = bytestream2_get_le16(&g2); | |
579 | CHECK_PIXEL_PTR(2 * byte_run); | |
580 | for (j = 0; j < byte_run; j++, pixel_countdown -= 2) { | |
581 | *((signed short*)(&pixels[pixel_ptr])) = pixel; | |
582 | pixel_ptr += 2; | |
583 | } | |
584 | } else { | |
585 | if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk) | |
586 | break; | |
587 | CHECK_PIXEL_PTR(2 * byte_run); | |
588 | for (j = 0; j < byte_run; j++, pixel_countdown--) { | |
589 | *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2); | |
590 | pixel_ptr += 2; | |
591 | } | |
592 | } | |
593 | } | |
594 | ||
595 | y_ptr += s->frame->linesize[0]; | |
596 | } | |
597 | } | |
598 | break; | |
599 | ||
600 | case FLI_LC: | |
601 | av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n"); | |
602 | bytestream2_skip(&g2, chunk_size - 6); | |
603 | break; | |
604 | ||
605 | case FLI_BLACK: | |
606 | /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */ | |
607 | memset(pixels, 0x0000, | |
608 | s->frame->linesize[0] * s->avctx->height); | |
609 | break; | |
610 | ||
611 | case FLI_BRUN: | |
612 | y_ptr = 0; | |
613 | for (lines = 0; lines < s->avctx->height; lines++) { | |
614 | pixel_ptr = y_ptr; | |
615 | /* disregard the line packets; instead, iterate through all | |
616 | * pixels on a row */ | |
617 | bytestream2_skip(&g2, 1); | |
618 | pixel_countdown = (s->avctx->width * 2); | |
619 | ||
620 | while (pixel_countdown > 0) { | |
621 | if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk) | |
622 | break; | |
623 | byte_run = sign_extend(bytestream2_get_byte(&g2), 8); | |
624 | if (byte_run > 0) { | |
625 | palette_idx1 = bytestream2_get_byte(&g2); | |
626 | CHECK_PIXEL_PTR(byte_run); | |
627 | for (j = 0; j < byte_run; j++) { | |
628 | pixels[pixel_ptr++] = palette_idx1; | |
629 | pixel_countdown--; | |
630 | if (pixel_countdown < 0) | |
631 | av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n", | |
632 | pixel_countdown, lines); | |
633 | } | |
634 | } else { /* copy bytes if byte_run < 0 */ | |
635 | byte_run = -byte_run; | |
636 | if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk) | |
637 | break; | |
638 | CHECK_PIXEL_PTR(byte_run); | |
639 | for (j = 0; j < byte_run; j++) { | |
640 | palette_idx1 = bytestream2_get_byte(&g2); | |
641 | pixels[pixel_ptr++] = palette_idx1; | |
642 | pixel_countdown--; | |
643 | if (pixel_countdown < 0) | |
644 | av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n", | |
645 | pixel_countdown, lines); | |
646 | } | |
647 | } | |
648 | } | |
649 | ||
650 | /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed. | |
651 | * This does not give us any good opportunity to perform word endian conversion | |
652 | * during decompression. So if it is required (i.e., this is not a LE target, we do | |
653 | * a second pass over the line here, swapping the bytes. | |
654 | */ | |
655 | #if HAVE_BIGENDIAN | |
656 | pixel_ptr = y_ptr; | |
657 | pixel_countdown = s->avctx->width; | |
658 | while (pixel_countdown > 0) { | |
659 | *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]); | |
660 | pixel_ptr += 2; | |
661 | } | |
662 | #endif | |
663 | y_ptr += s->frame->linesize[0]; | |
664 | } | |
665 | break; | |
666 | ||
667 | case FLI_DTA_BRUN: | |
668 | y_ptr = 0; | |
669 | for (lines = 0; lines < s->avctx->height; lines++) { | |
670 | pixel_ptr = y_ptr; | |
671 | /* disregard the line packets; instead, iterate through all | |
672 | * pixels on a row */ | |
673 | bytestream2_skip(&g2, 1); | |
674 | pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */ | |
675 | ||
676 | while (pixel_countdown > 0) { | |
677 | if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk) | |
678 | break; | |
679 | byte_run = sign_extend(bytestream2_get_byte(&g2), 8); | |
680 | if (byte_run > 0) { | |
681 | pixel = bytestream2_get_le16(&g2); | |
682 | CHECK_PIXEL_PTR(2 * byte_run); | |
683 | for (j = 0; j < byte_run; j++) { | |
684 | *((signed short*)(&pixels[pixel_ptr])) = pixel; | |
685 | pixel_ptr += 2; | |
686 | pixel_countdown--; | |
687 | if (pixel_countdown < 0) | |
688 | av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n", | |
689 | pixel_countdown); | |
690 | } | |
691 | } else { /* copy pixels if byte_run < 0 */ | |
692 | byte_run = -byte_run; | |
693 | if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk) | |
694 | break; | |
695 | CHECK_PIXEL_PTR(2 * byte_run); | |
696 | for (j = 0; j < byte_run; j++) { | |
697 | *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2); | |
698 | pixel_ptr += 2; | |
699 | pixel_countdown--; | |
700 | if (pixel_countdown < 0) | |
701 | av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n", | |
702 | pixel_countdown); | |
703 | } | |
704 | } | |
705 | } | |
706 | ||
707 | y_ptr += s->frame->linesize[0]; | |
708 | } | |
709 | break; | |
710 | ||
711 | case FLI_COPY: | |
712 | case FLI_DTA_COPY: | |
713 | /* copy the chunk (uncompressed frame) */ | |
714 | if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) { | |
715 | av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \ | |
716 | "bigger than image, skipping chunk\n", chunk_size - 6); | |
717 | bytestream2_skip(&g2, chunk_size - 6); | |
718 | } else { | |
719 | ||
720 | for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height; | |
721 | y_ptr += s->frame->linesize[0]) { | |
722 | ||
723 | pixel_countdown = s->avctx->width; | |
724 | pixel_ptr = 0; | |
725 | while (pixel_countdown > 0) { | |
726 | *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2); | |
727 | pixel_ptr += 2; | |
728 | pixel_countdown--; | |
729 | } | |
730 | } | |
731 | } | |
732 | break; | |
733 | ||
734 | case FLI_MINI: | |
735 | /* some sort of a thumbnail? disregard this chunk... */ | |
736 | bytestream2_skip(&g2, chunk_size - 6); | |
737 | break; | |
738 | ||
739 | default: | |
740 | av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type); | |
741 | break; | |
742 | } | |
743 | ||
744 | frame_size -= chunk_size; | |
745 | num_chunks--; | |
746 | } | |
747 | ||
748 | /* by the end of the chunk, the stream ptr should equal the frame | |
749 | * size (minus 1, possibly); if it doesn't, issue a warning */ | |
750 | if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1)) | |
751 | av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \ | |
752 | "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2)); | |
753 | ||
754 | if ((ret = av_frame_ref(data, s->frame)) < 0) | |
755 | return ret; | |
756 | ||
757 | *got_frame = 1; | |
758 | ||
759 | return buf_size; | |
760 | } | |
761 | ||
762 | static int flic_decode_frame_24BPP(AVCodecContext *avctx, | |
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 | ||
770 | static int flic_decode_frame(AVCodecContext *avctx, | |
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 | ||
799 | static av_cold int flic_decode_end(AVCodecContext *avctx) | |
800 | { | |
801 | FlicDecodeContext *s = avctx->priv_data; | |
802 | ||
803 | av_frame_free(&s->frame); | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
808 | AVCodec ff_flic_decoder = { | |
809 | .name = "flic", | |
810 | .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"), | |
811 | .type = AVMEDIA_TYPE_VIDEO, | |
812 | .id = AV_CODEC_ID_FLIC, | |
813 | .priv_data_size = sizeof(FlicDecodeContext), | |
814 | .init = flic_decode_init, | |
815 | .close = flic_decode_end, | |
816 | .decode = flic_decode_frame, | |
817 | .capabilities = CODEC_CAP_DR1, | |
818 | }; |