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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / flicvideo.c
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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
72typedef 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
81static 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
153static 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
477static 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
762static 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
770static 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
799static 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
808AVCodec 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};
ffmpeg Piment Noir Debian package repository