FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/flicvideo.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 186 603 30.8%
Branches: 110 409 26.9%

Line Branch Exec Source
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/BGR24. To use this decoder, be
31 * sure that your demuxer sends the FLI file header to the decoder via
32 * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
33 * large. The only exception is for FLI files from the game "Magic Carpet",
34 * in which the header is only 12 bytes.
35 */
36
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40
41 #include "libavutil/intreadwrite.h"
42 #include "avcodec.h"
43 #include "bytestream.h"
44 #include "internal.h"
45 #include "mathops.h"
46
47 #define FLI_256_COLOR 4
48 #define FLI_DELTA 7
49 #define FLI_COLOR 11
50 #define FLI_LC 12
51 #define FLI_BLACK 13
52 #define FLI_BRUN 15
53 #define FLI_COPY 16
54 #define FLI_MINI 18
55 #define FLI_DTA_BRUN 25
56 #define FLI_DTA_COPY 26
57 #define FLI_DTA_LC 27
58
59 #define FLI_TYPE_CODE (0xAF11)
60 #define FLC_FLX_TYPE_CODE (0xAF12)
61 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
62 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
63
64 #define CHECK_PIXEL_PTR(n) \
65 if (pixel_ptr + n > pixel_limit) { \
66 av_log (s->avctx, AV_LOG_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \
67 pixel_ptr + n, pixel_limit); \
68 return AVERROR_INVALIDDATA; \
69 } \
70
71 typedef struct FlicDecodeContext {
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 8 static av_cold int flic_decode_init(AVCodecContext *avctx)
81 {
82 8 FlicDecodeContext *s = avctx->priv_data;
83 8 unsigned char *fli_header = (unsigned char *)avctx->extradata;
84 int depth;
85
86
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8 if (avctx->extradata_size != 0 &&
87
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8 avctx->extradata_size != 12 &&
88
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6 avctx->extradata_size != 128 &&
89 avctx->extradata_size != 256 &&
90 avctx->extradata_size != 904 &&
91 avctx->extradata_size != 1024) {
92 av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size);
93 return AVERROR_INVALIDDATA;
94 }
95
96 8 s->avctx = avctx;
97
98
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8 if (s->avctx->extradata_size == 12) {
99 /* special case for magic carpet FLIs */
100 2 s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
101 2 depth = 8;
102
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6 } else if (avctx->extradata_size == 1024) {
103 uint8_t *ptr = avctx->extradata;
104 int i;
105
106 for (i = 0; i < 256; i++) {
107 s->palette[i] = AV_RL32(ptr);
108 ptr += 4;
109 }
110 depth = 8;
111 /* FLI in MOV, see e.g. FFmpeg trac issue #626 */
112
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6 } else if (avctx->extradata_size == 0 ||
113
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6 avctx->extradata_size == 256 ||
114 /* see FFmpeg ticket #1234 */
115
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6 avctx->extradata_size == 904) {
116 s->fli_type = FLI_TYPE_CODE;
117 depth = 8;
118 } else {
119 6 s->fli_type = AV_RL16(&fli_header[4]);
120 6 depth = AV_RL16(&fli_header[12]);
121 }
122
123
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8 if (depth == 0) {
124 depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
125 }
126
127
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8 if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
128 depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
129 }
130
131
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8 switch (depth) {
132 8 case 8 : avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
133 case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
134 case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;
135 case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
136 default :
137 av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
138 return AVERROR_INVALIDDATA;
139 }
140
141 8 s->frame = av_frame_alloc();
142
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8 if (!s->frame)
143 return AVERROR(ENOMEM);
144
145 8 s->new_palette = 0;
146
147 8 return 0;
148 }
149
150 501 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
151 void *data, int *got_frame,
152 const uint8_t *buf, int buf_size)
153 {
154 501 FlicDecodeContext *s = avctx->priv_data;
155
156 GetByteContext g2;
157 int pixel_ptr;
158 int palette_ptr;
159 unsigned char palette_idx1;
160 unsigned char palette_idx2;
161
162 unsigned int frame_size;
163 int num_chunks;
164
165 unsigned int chunk_size;
166 int chunk_type;
167
168 int i, j, ret;
169
170 int color_packets;
171 int color_changes;
172 int color_shift;
173 unsigned char r, g, b;
174
175 int lines;
176 int compressed_lines;
177 int starting_line;
178 int line_packets;
179 int y_ptr;
180 int byte_run;
181 int pixel_skip;
182 int pixel_countdown;
183 unsigned char *pixels;
184 unsigned int pixel_limit;
185
186 501 bytestream2_init(&g2, buf, buf_size);
187
188
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501 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
189 return ret;
190
191 501 pixels = s->frame->data[0];
192 501 pixel_limit = s->avctx->height * s->frame->linesize[0];
193
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501 if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + AV_INPUT_BUFFER_PADDING_SIZE))
194 return AVERROR_INVALIDDATA;
195 501 frame_size = bytestream2_get_le32(&g2);
196
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501 if (frame_size > buf_size)
197 frame_size = buf_size;
198 501 bytestream2_skip(&g2, 2); /* skip the magic number */
199 501 num_chunks = bytestream2_get_le16(&g2);
200 501 bytestream2_skip(&g2, 8); /* skip padding */
201
202
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501 if (frame_size < 16)
203 return AVERROR_INVALIDDATA;
204
205 501 frame_size -= 16;
206
207 /* iterate through the chunks */
208
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1549 while ((frame_size >= 6) && (num_chunks > 0) &&
209 524 bytestream2_get_bytes_left(&g2) >= 4) {
210 int stream_ptr_after_chunk;
211 524 chunk_size = bytestream2_get_le32(&g2);
212
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524 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 }
217 524 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
218
219 524 chunk_type = bytestream2_get_le16(&g2);
220
221
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524 switch (chunk_type) {
222 42 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
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42 if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
229 1 color_shift = 0;
230 else
231 41 color_shift = 2;
232 /* set up the palette */
233 42 color_packets = bytestream2_get_le16(&g2);
234 42 palette_ptr = 0;
235
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297 for (i = 0; i < color_packets; i++) {
236 /* first byte is how many colors to skip */
237 255 palette_ptr += bytestream2_get_byte(&g2);
238
239 /* next byte indicates how many entries to change */
240 255 color_changes = bytestream2_get_byte(&g2);
241
242 /* if there are 0 color changes, there are actually 256 */
243
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255 if (color_changes == 0)
244 4 color_changes = 256;
245
246
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255 if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk)
247 break;
248
249
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10643 for (j = 0; j < color_changes; j++) {
250 unsigned int entry;
251
252 /* wrap around, for good measure */
253
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10388 if ((unsigned)palette_ptr >= 256)
254 palette_ptr = 0;
255
256 10388 r = bytestream2_get_byte(&g2) << color_shift;
257 10388 g = bytestream2_get_byte(&g2) << color_shift;
258 10388 b = bytestream2_get_byte(&g2) << color_shift;
259 10388 entry = 0xFFU << 24 | r << 16 | g << 8 | b;
260
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10388 if (color_shift == 2)
261 10132 entry |= entry >> 6 & 0x30303;
262
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10388 if (s->palette[palette_ptr] != entry)
263 10388 s->new_palette = 1;
264 10388 s->palette[palette_ptr++] = entry;
265 }
266 }
267 42 break;
268
269 67 case FLI_DELTA:
270 67 y_ptr = 0;
271 67 compressed_lines = bytestream2_get_le16(&g2);
272
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8288 while (compressed_lines > 0) {
273
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8221 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
274 break;
275
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8221 if (y_ptr > pixel_limit)
276 return AVERROR_INVALIDDATA;
277 8221 line_packets = sign_extend(bytestream2_get_le16(&g2), 16);
278
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8221 if ((line_packets & 0xC000) == 0xC000) {
279 // line skip opcode
280 108 line_packets = -line_packets;
281
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108 if (line_packets > s->avctx->height)
282 return AVERROR_INVALIDDATA;
283 108 y_ptr += line_packets * s->frame->linesize[0];
284
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8113 } else if ((line_packets & 0xC000) == 0x4000) {
285 av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
286
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8113 } else if ((line_packets & 0xC000) == 0x8000) {
287 // "last byte" opcode
288 pixel_ptr= y_ptr + s->frame->linesize[0] - 1;
289 CHECK_PIXEL_PTR(0);
290 pixels[pixel_ptr] = line_packets & 0xff;
291 } else {
292 8113 compressed_lines--;
293 8113 pixel_ptr = y_ptr;
294
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8113 CHECK_PIXEL_PTR(0);
295 8113 pixel_countdown = s->avctx->width;
296
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132721 for (i = 0; i < line_packets; i++) {
297
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124608 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
298 break;
299 /* account for the skip bytes */
300 124608 pixel_skip = bytestream2_get_byte(&g2);
301 124608 pixel_ptr += pixel_skip;
302 124608 pixel_countdown -= pixel_skip;
303 124608 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
304
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124608 if (byte_run < 0) {
305 37508 byte_run = -byte_run;
306 37508 palette_idx1 = bytestream2_get_byte(&g2);
307 37508 palette_idx2 = bytestream2_get_byte(&g2);
308
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37508 CHECK_PIXEL_PTR(byte_run * 2);
309
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220003 for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
310 182495 pixels[pixel_ptr++] = palette_idx1;
311 182495 pixels[pixel_ptr++] = palette_idx2;
312 }
313 } else {
314
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87100 CHECK_PIXEL_PTR(byte_run * 2);
315
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87100 if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk)
316 break;
317
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906386 for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
318 819286 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
319 }
320 }
321 }
322
323 8113 y_ptr += s->frame->linesize[0];
324 }
325 }
326 67 break;
327
328 411 case FLI_LC:
329 /* line compressed */
330 411 starting_line = bytestream2_get_le16(&g2);
331
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411 if (starting_line >= s->avctx->height)
332 return AVERROR_INVALIDDATA;
333 411 y_ptr = 0;
334 411 y_ptr += starting_line * s->frame->linesize[0];
335
336 411 compressed_lines = bytestream2_get_le16(&g2);
337
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53677 while (compressed_lines > 0) {
338 53266 pixel_ptr = y_ptr;
339
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53266 CHECK_PIXEL_PTR(0);
340 53266 pixel_countdown = s->avctx->width;
341
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53266 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
342 break;
343 53266 line_packets = bytestream2_get_byte(&g2);
344
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53266 if (line_packets > 0) {
345
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369126 for (i = 0; i < line_packets; i++) {
346 /* account for the skip bytes */
347
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320826 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
348 break;
349 320826 pixel_skip = bytestream2_get_byte(&g2);
350 320826 pixel_ptr += pixel_skip;
351 320826 pixel_countdown -= pixel_skip;
352 320826 byte_run = sign_extend(bytestream2_get_byte(&g2),8);
353
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320826 if (byte_run > 0) {
354
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235604 CHECK_PIXEL_PTR(byte_run);
355
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235604 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
356 break;
357
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1600390 for (j = 0; j < byte_run; j++, pixel_countdown--) {
358 1364786 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
359 }
360
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85222 } else if (byte_run < 0) {
361 85222 byte_run = -byte_run;
362 85222 palette_idx1 = bytestream2_get_byte(&g2);
363
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85222 CHECK_PIXEL_PTR(byte_run);
364
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625612 for (j = 0; j < byte_run; j++, pixel_countdown--) {
365 540390 pixels[pixel_ptr++] = palette_idx1;
366 }
367 }
368 }
369 }
370
371 53266 y_ptr += s->frame->linesize[0];
372 53266 compressed_lines--;
373 }
374 411 break;
375
376 case FLI_BLACK:
377 /* set the whole frame to color 0 (which is usually black) */
378 memset(pixels, 0,
379 s->frame->linesize[0] * s->avctx->height);
380 break;
381
382 4 case FLI_BRUN:
383 /* Byte run compression: This chunk type only occurs in the first
384 * FLI frame and it will update the entire frame. */
385 4 y_ptr = 0;
386
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1084 for (lines = 0; lines < s->avctx->height; lines++) {
387 1080 pixel_ptr = y_ptr;
388 /* disregard the line packets; instead, iterate through all
389 * pixels on a row */
390 1080 bytestream2_skip(&g2, 1);
391 1080 pixel_countdown = s->avctx->width;
392
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23867 while (pixel_countdown > 0) {
393
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22787 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
394 break;
395 22787 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
396
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22787 if (!byte_run) {
397 av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n");
398 return AVERROR_INVALIDDATA;
399 }
400
401
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22787 if (byte_run > 0) {
402 14467 palette_idx1 = bytestream2_get_byte(&g2);
403
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14467 CHECK_PIXEL_PTR(byte_run);
404
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492515 for (j = 0; j < byte_run; j++) {
405 478048 pixels[pixel_ptr++] = palette_idx1;
406 478048 pixel_countdown--;
407
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478048 if (pixel_countdown < 0)
408 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
409 pixel_countdown, lines);
410 }
411 } else { /* copy bytes if byte_run < 0 */
412 8320 byte_run = -byte_run;
413
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8320 CHECK_PIXEL_PTR(byte_run);
414
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8320 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
415 break;
416
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29472 for (j = 0; j < byte_run; j++) {
417 21152 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
418 21152 pixel_countdown--;
419
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21152 if (pixel_countdown < 0)
420 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
421 pixel_countdown, lines);
422 }
423 }
424 }
425
426 1080 y_ptr += s->frame->linesize[0];
427 }
428 4 break;
429
430 case FLI_COPY:
431 /* copy the chunk (uncompressed frame) */
432 if (chunk_size - 6 != FFALIGN(s->avctx->width, 4) * s->avctx->height) {
433 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
434 "has incorrect size, skipping chunk\n", chunk_size - 6);
435 bytestream2_skip(&g2, chunk_size - 6);
436 } else {
437 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
438 y_ptr += s->frame->linesize[0]) {
439 bytestream2_get_buffer(&g2, &pixels[y_ptr],
440 s->avctx->width);
441 if (s->avctx->width & 3)
442 bytestream2_skip(&g2, 4 - (s->avctx->width & 3));
443 }
444 }
445 break;
446
447 case FLI_MINI:
448 /* some sort of a thumbnail? disregard this chunk... */
449 break;
450
451 default:
452 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
453 break;
454 }
455
456
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524 if (stream_ptr_after_chunk - bytestream2_tell(&g2) >= 0) {
457 524 bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
458 } else {
459 av_log(avctx, AV_LOG_ERROR, "Chunk overread\n");
460 break;
461 }
462
463 524 frame_size -= chunk_size;
464 524 num_chunks--;
465 }
466
467 /* by the end of the chunk, the stream ptr should equal the frame
468 * size (minus 1 or 2, possibly); if it doesn't, issue a warning */
469
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501 if (bytestream2_get_bytes_left(&g2) > 2)
470 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
471 "and final chunk ptr = %d\n", buf_size,
472 buf_size - bytestream2_get_bytes_left(&g2));
473
474 /* make the palette available on the way out */
475 501 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
476
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501 if (s->new_palette) {
477 42 s->frame->palette_has_changed = 1;
478 42 s->new_palette = 0;
479 }
480
481
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501 if ((ret = av_frame_ref(data, s->frame)) < 0)
482 return ret;
483
484 501 *got_frame = 1;
485
486 501 return buf_size;
487 }
488
489 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
490 void *data, int *got_frame,
491 const uint8_t *buf, int buf_size)
492 {
493 /* Note, the only difference between the 15Bpp and 16Bpp */
494 /* Format is the pixel format, the packets are processed the same. */
495 FlicDecodeContext *s = avctx->priv_data;
496
497 GetByteContext g2;
498 int pixel_ptr;
499 unsigned char palette_idx1;
500
501 unsigned int frame_size;
502 int num_chunks;
503
504 unsigned int chunk_size;
505 int chunk_type;
506
507 int i, j, ret;
508
509 int lines;
510 int compressed_lines;
511 int line_packets;
512 int y_ptr;
513 int byte_run;
514 int pixel_skip;
515 int pixel_countdown;
516 unsigned char *pixels;
517 int pixel;
518 unsigned int pixel_limit;
519
520 bytestream2_init(&g2, buf, buf_size);
521
522 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
523 return ret;
524
525 pixels = s->frame->data[0];
526 pixel_limit = s->avctx->height * s->frame->linesize[0];
527
528 frame_size = bytestream2_get_le32(&g2);
529 bytestream2_skip(&g2, 2); /* skip the magic number */
530 num_chunks = bytestream2_get_le16(&g2);
531 bytestream2_skip(&g2, 8); /* skip padding */
532 if (frame_size > buf_size)
533 frame_size = buf_size;
534
535 if (frame_size < 16)
536 return AVERROR_INVALIDDATA;
537 frame_size -= 16;
538
539 /* iterate through the chunks */
540 while ((frame_size > 0) && (num_chunks > 0) &&
541 bytestream2_get_bytes_left(&g2) >= 4) {
542 int stream_ptr_after_chunk;
543 chunk_size = bytestream2_get_le32(&g2);
544 if (chunk_size > frame_size) {
545 av_log(avctx, AV_LOG_WARNING,
546 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
547 chunk_size = frame_size;
548 }
549 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
550
551 chunk_type = bytestream2_get_le16(&g2);
552
553
554 switch (chunk_type) {
555 case FLI_256_COLOR:
556 case FLI_COLOR:
557 /* For some reason, it seems that non-palettized flics do
558 * include one of these chunks in their first frame.
559 * Why I do not know, it seems rather extraneous. */
560 ff_dlog(avctx,
561 "Unexpected Palette chunk %d in non-palettized FLC\n",
562 chunk_type);
563 bytestream2_skip(&g2, chunk_size - 6);
564 break;
565
566 case FLI_DELTA:
567 case FLI_DTA_LC:
568 y_ptr = 0;
569 compressed_lines = bytestream2_get_le16(&g2);
570 while (compressed_lines > 0) {
571 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
572 break;
573 if (y_ptr > pixel_limit)
574 return AVERROR_INVALIDDATA;
575 line_packets = sign_extend(bytestream2_get_le16(&g2), 16);
576 if (line_packets < 0) {
577 line_packets = -line_packets;
578 if (line_packets > s->avctx->height)
579 return AVERROR_INVALIDDATA;
580 y_ptr += line_packets * s->frame->linesize[0];
581 } else {
582 compressed_lines--;
583 pixel_ptr = y_ptr;
584 CHECK_PIXEL_PTR(0);
585 pixel_countdown = s->avctx->width;
586 for (i = 0; i < line_packets; i++) {
587 /* account for the skip bytes */
588 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
589 break;
590 pixel_skip = bytestream2_get_byte(&g2);
591 pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
592 pixel_countdown -= pixel_skip;
593 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
594 if (byte_run < 0) {
595 byte_run = -byte_run;
596 pixel = bytestream2_get_le16(&g2);
597 CHECK_PIXEL_PTR(2 * byte_run);
598 for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
599 *((signed short*)(&pixels[pixel_ptr])) = pixel;
600 pixel_ptr += 2;
601 }
602 } else {
603 if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
604 break;
605 CHECK_PIXEL_PTR(2 * byte_run);
606 for (j = 0; j < byte_run; j++, pixel_countdown--) {
607 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
608 pixel_ptr += 2;
609 }
610 }
611 }
612
613 y_ptr += s->frame->linesize[0];
614 }
615 }
616 break;
617
618 case FLI_LC:
619 av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");
620 bytestream2_skip(&g2, chunk_size - 6);
621 break;
622
623 case FLI_BLACK:
624 /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
625 memset(pixels, 0x0000,
626 s->frame->linesize[0] * s->avctx->height);
627 break;
628
629 case FLI_BRUN:
630 y_ptr = 0;
631 for (lines = 0; lines < s->avctx->height; lines++) {
632 pixel_ptr = y_ptr;
633 /* disregard the line packets; instead, iterate through all
634 * pixels on a row */
635 bytestream2_skip(&g2, 1);
636 pixel_countdown = (s->avctx->width * 2);
637
638 while (pixel_countdown > 0) {
639 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
640 break;
641 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
642 if (byte_run > 0) {
643 palette_idx1 = bytestream2_get_byte(&g2);
644 CHECK_PIXEL_PTR(byte_run);
645 for (j = 0; j < byte_run; j++) {
646 pixels[pixel_ptr++] = palette_idx1;
647 pixel_countdown--;
648 if (pixel_countdown < 0)
649 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
650 pixel_countdown, lines);
651 }
652 } else { /* copy bytes if byte_run < 0 */
653 byte_run = -byte_run;
654 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
655 break;
656 CHECK_PIXEL_PTR(byte_run);
657 for (j = 0; j < byte_run; j++) {
658 palette_idx1 = bytestream2_get_byte(&g2);
659 pixels[pixel_ptr++] = palette_idx1;
660 pixel_countdown--;
661 if (pixel_countdown < 0)
662 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
663 pixel_countdown, lines);
664 }
665 }
666 }
667
668 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
669 * This does not give us any good opportunity to perform word endian conversion
670 * during decompression. So if it is required (i.e., this is not a LE target, we do
671 * a second pass over the line here, swapping the bytes.
672 */
673 #if HAVE_BIGENDIAN
674 pixel_ptr = y_ptr;
675 pixel_countdown = s->avctx->width;
676 while (pixel_countdown > 0) {
677 *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
678 pixel_ptr += 2;
679 }
680 #endif
681 y_ptr += s->frame->linesize[0];
682 }
683 break;
684
685 case FLI_DTA_BRUN:
686 y_ptr = 0;
687 for (lines = 0; lines < s->avctx->height; lines++) {
688 pixel_ptr = y_ptr;
689 /* disregard the line packets; instead, iterate through all
690 * pixels on a row */
691 bytestream2_skip(&g2, 1);
692 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
693
694 while (pixel_countdown > 0) {
695 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
696 break;
697 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
698 if (byte_run > 0) {
699 pixel = bytestream2_get_le16(&g2);
700 CHECK_PIXEL_PTR(2 * byte_run);
701 for (j = 0; j < byte_run; j++) {
702 *((signed short*)(&pixels[pixel_ptr])) = pixel;
703 pixel_ptr += 2;
704 pixel_countdown--;
705 if (pixel_countdown < 0)
706 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
707 pixel_countdown);
708 }
709 } else { /* copy pixels if byte_run < 0 */
710 byte_run = -byte_run;
711 if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)
712 break;
713 CHECK_PIXEL_PTR(2 * byte_run);
714 for (j = 0; j < byte_run; j++) {
715 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
716 pixel_ptr += 2;
717 pixel_countdown--;
718 if (pixel_countdown < 0)
719 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
720 pixel_countdown);
721 }
722 }
723 }
724
725 y_ptr += s->frame->linesize[0];
726 }
727 break;
728
729 case FLI_COPY:
730 case FLI_DTA_COPY:
731 /* copy the chunk (uncompressed frame) */
732 if (chunk_size - 6 > (unsigned int)(FFALIGN(s->avctx->width, 2) * s->avctx->height)*2) {
733 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
734 "bigger than image, skipping chunk\n", chunk_size - 6);
735 bytestream2_skip(&g2, chunk_size - 6);
736 } else {
737
738 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
739 y_ptr += s->frame->linesize[0]) {
740
741 pixel_countdown = s->avctx->width;
742 pixel_ptr = 0;
743 while (pixel_countdown > 0) {
744 *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
745 pixel_ptr += 2;
746 pixel_countdown--;
747 }
748 if (s->avctx->width & 1)
749 bytestream2_skip(&g2, 2);
750 }
751 }
752 break;
753
754 case FLI_MINI:
755 /* some sort of a thumbnail? disregard this chunk... */
756 bytestream2_skip(&g2, chunk_size - 6);
757 break;
758
759 default:
760 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
761 break;
762 }
763
764 if (stream_ptr_after_chunk - bytestream2_tell(&g2) >= 0) {
765 bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
766 } else {
767 av_log(avctx, AV_LOG_ERROR, "Chunk overread\n");
768 break;
769 }
770
771 frame_size -= chunk_size;
772 num_chunks--;
773 }
774
775 /* by the end of the chunk, the stream ptr should equal the frame
776 * size (minus 1, possibly); if it doesn't, issue a warning */
777 if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
778 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
779 "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
780
781 if ((ret = av_frame_ref(data, s->frame)) < 0)
782 return ret;
783
784 *got_frame = 1;
785
786 return buf_size;
787 }
788
789 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
790 void *data, int *got_frame,
791 const uint8_t *buf, int buf_size)
792 {
793 FlicDecodeContext *s = avctx->priv_data;
794
795 GetByteContext g2;
796 int pixel_ptr;
797 unsigned char palette_idx1;
798
799 unsigned int frame_size;
800 int num_chunks;
801
802 unsigned int chunk_size;
803 int chunk_type;
804
805 int i, j, ret;
806
807 int lines;
808 int compressed_lines;
809 int line_packets;
810 int y_ptr;
811 int byte_run;
812 int pixel_skip;
813 int pixel_countdown;
814 unsigned char *pixels;
815 int pixel;
816 unsigned int pixel_limit;
817
818 bytestream2_init(&g2, buf, buf_size);
819
820 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
821 return ret;
822
823 pixels = s->frame->data[0];
824 pixel_limit = s->avctx->height * s->frame->linesize[0];
825
826 frame_size = bytestream2_get_le32(&g2);
827 bytestream2_skip(&g2, 2); /* skip the magic number */
828 num_chunks = bytestream2_get_le16(&g2);
829 bytestream2_skip(&g2, 8); /* skip padding */
830 if (frame_size > buf_size)
831 frame_size = buf_size;
832
833 if (frame_size < 16)
834 return AVERROR_INVALIDDATA;
835 frame_size -= 16;
836
837 /* iterate through the chunks */
838 while ((frame_size > 0) && (num_chunks > 0) &&
839 bytestream2_get_bytes_left(&g2) >= 4) {
840 int stream_ptr_after_chunk;
841 chunk_size = bytestream2_get_le32(&g2);
842 if (chunk_size > frame_size) {
843 av_log(avctx, AV_LOG_WARNING,
844 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
845 chunk_size = frame_size;
846 }
847 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
848
849 chunk_type = bytestream2_get_le16(&g2);
850
851
852 switch (chunk_type) {
853 case FLI_256_COLOR:
854 case FLI_COLOR:
855 /* For some reason, it seems that non-palettized flics do
856 * include one of these chunks in their first frame.
857 * Why I do not know, it seems rather extraneous. */
858 ff_dlog(avctx,
859 "Unexpected Palette chunk %d in non-palettized FLC\n",
860 chunk_type);
861 bytestream2_skip(&g2, chunk_size - 6);
862 break;
863
864 case FLI_DELTA:
865 case FLI_DTA_LC:
866 y_ptr = 0;
867 compressed_lines = bytestream2_get_le16(&g2);
868 while (compressed_lines > 0) {
869 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
870 break;
871 if (y_ptr > pixel_limit)
872 return AVERROR_INVALIDDATA;
873 line_packets = sign_extend(bytestream2_get_le16(&g2), 16);
874 if (line_packets < 0) {
875 line_packets = -line_packets;
876 if (line_packets > s->avctx->height)
877 return AVERROR_INVALIDDATA;
878 y_ptr += line_packets * s->frame->linesize[0];
879 } else {
880 compressed_lines--;
881 pixel_ptr = y_ptr;
882 CHECK_PIXEL_PTR(0);
883 pixel_countdown = s->avctx->width;
884 for (i = 0; i < line_packets; i++) {
885 /* account for the skip bytes */
886 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
887 break;
888 pixel_skip = bytestream2_get_byte(&g2);
889 pixel_ptr += (pixel_skip*3); /* Pixel is 3 bytes wide */
890 pixel_countdown -= pixel_skip;
891 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
892 if (byte_run < 0) {
893 byte_run = -byte_run;
894 pixel = bytestream2_get_le24(&g2);
895 CHECK_PIXEL_PTR(3 * byte_run);
896 for (j = 0; j < byte_run; j++, pixel_countdown -= 1) {
897 AV_WL24(&pixels[pixel_ptr], pixel);
898 pixel_ptr += 3;
899 }
900 } else {
901 if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
902 break;
903 CHECK_PIXEL_PTR(3 * byte_run);
904 for (j = 0; j < byte_run; j++, pixel_countdown--) {
905 pixel = bytestream2_get_le24(&g2);
906 AV_WL24(&pixels[pixel_ptr], pixel);
907 pixel_ptr += 3;
908 }
909 }
910 }
911
912 y_ptr += s->frame->linesize[0];
913 }
914 }
915 break;
916
917 case FLI_LC:
918 av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");
919 bytestream2_skip(&g2, chunk_size - 6);
920 break;
921
922 case FLI_BLACK:
923 /* set the whole frame to 0x00 which is black for 24 bit mode. */
924 memset(pixels, 0x00,
925 s->frame->linesize[0] * s->avctx->height);
926 break;
927
928 case FLI_BRUN:
929 y_ptr = 0;
930 for (lines = 0; lines < s->avctx->height; lines++) {
931 pixel_ptr = y_ptr;
932 /* disregard the line packets; instead, iterate through all
933 * pixels on a row */
934 bytestream2_skip(&g2, 1);
935 pixel_countdown = (s->avctx->width * 3);
936
937 while (pixel_countdown > 0) {
938 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
939 break;
940 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
941 if (byte_run > 0) {
942 palette_idx1 = bytestream2_get_byte(&g2);
943 CHECK_PIXEL_PTR(byte_run);
944 for (j = 0; j < byte_run; j++) {
945 pixels[pixel_ptr++] = palette_idx1;
946 pixel_countdown--;
947 if (pixel_countdown < 0)
948 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
949 pixel_countdown, lines);
950 }
951 } else { /* copy bytes if byte_run < 0 */
952 byte_run = -byte_run;
953 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
954 break;
955 CHECK_PIXEL_PTR(byte_run);
956 for (j = 0; j < byte_run; j++) {
957 palette_idx1 = bytestream2_get_byte(&g2);
958 pixels[pixel_ptr++] = palette_idx1;
959 pixel_countdown--;
960 if (pixel_countdown < 0)
961 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
962 pixel_countdown, lines);
963 }
964 }
965 }
966
967 y_ptr += s->frame->linesize[0];
968 }
969 break;
970
971 case FLI_DTA_BRUN:
972 y_ptr = 0;
973 for (lines = 0; lines < s->avctx->height; lines++) {
974 pixel_ptr = y_ptr;
975 /* disregard the line packets; instead, iterate through all
976 * pixels on a row */
977 bytestream2_skip(&g2, 1);
978 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
979
980 while (pixel_countdown > 0) {
981 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
982 break;
983 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
984 if (byte_run > 0) {
985 pixel = bytestream2_get_le24(&g2);
986 CHECK_PIXEL_PTR(3 * byte_run);
987 for (j = 0; j < byte_run; j++) {
988 AV_WL24(pixels + pixel_ptr, pixel);
989 pixel_ptr += 3;
990 pixel_countdown--;
991 if (pixel_countdown < 0)
992 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
993 pixel_countdown);
994 }
995 } else { /* copy pixels if byte_run < 0 */
996 byte_run = -byte_run;
997 if (bytestream2_tell(&g2) + 3 * byte_run > stream_ptr_after_chunk)
998 break;
999 CHECK_PIXEL_PTR(3 * byte_run);
1000 for (j = 0; j < byte_run; j++) {
1001 pixel = bytestream2_get_le24(&g2);
1002 AV_WL24(pixels + pixel_ptr, pixel);
1003 pixel_ptr += 3;
1004 pixel_countdown--;
1005 if (pixel_countdown < 0)
1006 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
1007 pixel_countdown);
1008 }
1009 }
1010 }
1011
1012 y_ptr += s->frame->linesize[0];
1013 }
1014 break;
1015
1016 case FLI_COPY:
1017 case FLI_DTA_COPY:
1018 /* copy the chunk (uncompressed frame) */
1019 if (chunk_size - 6 > (unsigned int)(FFALIGN(s->avctx->width, 2) * s->avctx->height)*3) {
1020 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
1021 "bigger than image, skipping chunk\n", chunk_size - 6);
1022 bytestream2_skip(&g2, chunk_size - 6);
1023 } else {
1024 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
1025 y_ptr += s->frame->linesize[0]) {
1026
1027 bytestream2_get_buffer(&g2, pixels + y_ptr, 3*s->avctx->width);
1028 if (s->avctx->width & 1)
1029 bytestream2_skip(&g2, 3);
1030 }
1031 }
1032 break;
1033
1034 case FLI_MINI:
1035 /* some sort of a thumbnail? disregard this chunk... */
1036 bytestream2_skip(&g2, chunk_size - 6);
1037 break;
1038
1039 default:
1040 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
1041 break;
1042 }
1043
1044 if (stream_ptr_after_chunk - bytestream2_tell(&g2) >= 0) {
1045 bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
1046 } else {
1047 av_log(avctx, AV_LOG_ERROR, "Chunk overread\n");
1048 break;
1049 }
1050
1051 frame_size -= chunk_size;
1052 num_chunks--;
1053 }
1054
1055 /* by the end of the chunk, the stream ptr should equal the frame
1056 * size (minus 1, possibly); if it doesn't, issue a warning */
1057 if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
1058 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
1059 "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
1060
1061 if ((ret = av_frame_ref(data, s->frame)) < 0)
1062 return ret;
1063
1064 *got_frame = 1;
1065
1066 return buf_size;
1067 }
1068
1069 501 static int flic_decode_frame(AVCodecContext *avctx,
1070 void *data, int *got_frame,
1071 AVPacket *avpkt)
1072 {
1073 501 const uint8_t *buf = avpkt->data;
1074 501 int buf_size = avpkt->size;
1075
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501 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1076 501 return flic_decode_frame_8BPP(avctx, data, got_frame,
1077 buf, buf_size);
1078 } else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) ||
1079 (avctx->pix_fmt == AV_PIX_FMT_RGB565)) {
1080 return flic_decode_frame_15_16BPP(avctx, data, got_frame,
1081 buf, buf_size);
1082 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
1083 return flic_decode_frame_24BPP(avctx, data, got_frame,
1084 buf, buf_size);
1085 }
1086
1087 /* Should not get here, ever as the pix_fmt is processed */
1088 /* in flic_decode_init and the above if should deal with */
1089 /* the finite set of possibilities allowable by here. */
1090 /* But in case we do, just error out. */
1091 av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
1092 return AVERROR_BUG;
1093 }
1094
1095
1096 8 static av_cold int flic_decode_end(AVCodecContext *avctx)
1097 {
1098 8 FlicDecodeContext *s = avctx->priv_data;
1099
1100 8 av_frame_free(&s->frame);
1101
1102 8 return 0;
1103 }
1104
1105 const AVCodec ff_flic_decoder = {
1106 .name = "flic",
1107 .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
1108 .type = AVMEDIA_TYPE_VIDEO,
1109 .id = AV_CODEC_ID_FLIC,
1110 .priv_data_size = sizeof(FlicDecodeContext),
1111 .init = flic_decode_init,
1112 .close = flic_decode_end,
1113 .decode = flic_decode_frame,
1114 .capabilities = AV_CODEC_CAP_DR1,
1115 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
1116 };
1117