FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/gifdec.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 201 272 73.9%
Branches: 89 139 64.0%

Line Branch Exec Source
1 /*
2 * GIF decoder
3 * Copyright (c) 2003 Fabrice Bellard
4 * Copyright (c) 2006 Baptiste Coudurier
5 * Copyright (c) 2012 Vitaliy E Sugrobov
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include "libavutil/imgutils.h"
25 #include "libavutil/opt.h"
26 #include "avcodec.h"
27 #include "bytestream.h"
28 #include "internal.h"
29 #include "lzw.h"
30 #include "gif.h"
31
32 /* This value is intentionally set to "transparent white" color.
33 * It is much better to have white background instead of black
34 * when gif image converted to format which not support transparency.
35 */
36 #define GIF_TRANSPARENT_COLOR 0x00ffffff
37
38 typedef struct GifState {
39 const AVClass *class;
40 AVFrame *frame;
41 int screen_width;
42 int screen_height;
43 int has_global_palette;
44 int bits_per_pixel;
45 uint32_t bg_color;
46 int background_color_index;
47 int transparent_color_index;
48 int color_resolution;
49 /* intermediate buffer for storing color indices
50 * obtained from lzw-encoded data stream */
51 uint8_t *idx_line;
52 int idx_line_size;
53
54 /* after the frame is displayed, the disposal method is used */
55 int gce_prev_disposal;
56 int gce_disposal;
57 /* rectangle describing area that must be disposed */
58 int gce_l, gce_t, gce_w, gce_h;
59 /* depending on disposal method we store either part of the image
60 * drawn on the canvas or background color that
61 * should be used upon disposal */
62 uint32_t * stored_img;
63 int stored_img_size;
64 int stored_bg_color;
65
66 GetByteContext gb;
67 LZWState *lzw;
68
69 /* aux buffers */
70 uint32_t global_palette[256];
71 uint32_t local_palette[256];
72
73 AVCodecContext *avctx;
74 int keyframe;
75 int keyframe_ok;
76 int trans_color; /**< color value that is used instead of transparent color */
77 } GifState;
78
79 1219 static void gif_read_palette(GifState *s, uint32_t *pal, int nb)
80 {
81 int i;
82
83
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300547 for (i = 0; i < nb; i++, pal++)
84 299328 *pal = (0xffu << 24) | bytestream2_get_be24u(&s->gb);
85 1219 }
86
87 13 static void gif_fill(AVFrame *picture, uint32_t color)
88 {
89 13 uint32_t *p = (uint32_t *)picture->data[0];
90 13 uint32_t *p_end = p + (picture->linesize[0] / sizeof(uint32_t)) * picture->height;
91
92
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727197 for (; p < p_end; p++)
93 727184 *p = color;
94 13 }
95
96 6 static void gif_fill_rect(AVFrame *picture, uint32_t color, int l, int t, int w, int h)
97 {
98 6 const int linesize = picture->linesize[0] / sizeof(uint32_t);
99 6 const uint32_t *py = (uint32_t *)picture->data[0] + t * linesize;
100 6 const uint32_t *pr, *pb = py + h * linesize;
101 uint32_t *px;
102
103
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222 for (; py < pb; py += linesize) {
104 216 px = (uint32_t *)py + l;
105 216 pr = px + w;
106
107
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15768 for (; px < pr; px++)
108 15552 *px = color;
109 }
110 6 }
111
112 3 static void gif_copy_img_rect(const uint32_t *src, uint32_t *dst,
113 int linesize, int l, int t, int w, int h)
114 {
115 3 const int y_start = t * linesize;
116 const uint32_t *src_px,
117 3 *src_py = src + y_start,
118 3 *dst_py = dst + y_start;
119 3 const uint32_t *src_pb = src_py + h * linesize;
120 uint32_t *dst_px;
121
122
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183 for (; src_py < src_pb; src_py += linesize, dst_py += linesize) {
123 180 src_px = src_py + l;
124 180 dst_px = (uint32_t *)dst_py + l;
125
126 180 memcpy(dst_px, src_px, w * sizeof(uint32_t));
127 }
128 3 }
129
130 1294 static int gif_read_image(GifState *s, AVFrame *frame)
131 {
132 int left, top, width, height, bits_per_pixel, code_size, flags, pw;
133 int is_interleaved, has_local_palette, y, pass, y1, linesize, pal_size, lzwed_len;
134 uint32_t *ptr, *pal, *px, *pr, *ptr1;
135 int ret;
136 uint8_t *idx;
137
138 /* At least 9 bytes of Image Descriptor. */
139
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1294 if (bytestream2_get_bytes_left(&s->gb) < 9)
140 return AVERROR_INVALIDDATA;
141
142 1294 left = bytestream2_get_le16u(&s->gb);
143 1294 top = bytestream2_get_le16u(&s->gb);
144 1294 width = bytestream2_get_le16u(&s->gb);
145 1294 height = bytestream2_get_le16u(&s->gb);
146 1294 flags = bytestream2_get_byteu(&s->gb);
147 1294 is_interleaved = flags & 0x40;
148 1294 has_local_palette = flags & 0x80;
149 1294 bits_per_pixel = (flags & 0x07) + 1;
150
151 ff_dlog(s->avctx, "image x=%d y=%d w=%d h=%d\n", left, top, width, height);
152
153
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1294 if (has_local_palette) {
154 1213 pal_size = 1 << bits_per_pixel;
155
156
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1213 if (bytestream2_get_bytes_left(&s->gb) < pal_size * 3)
157 return AVERROR_INVALIDDATA;
158
159 1213 gif_read_palette(s, s->local_palette, pal_size);
160 1213 pal = s->local_palette;
161 } else {
162
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81 if (!s->has_global_palette) {
163 av_log(s->avctx, AV_LOG_ERROR, "picture doesn't have either global or local palette.\n");
164 return AVERROR_INVALIDDATA;
165 }
166
167 81 pal = s->global_palette;
168 }
169
170
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1294 if (s->keyframe) {
171
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13 if (s->transparent_color_index == -1 && s->has_global_palette) {
172 /* transparency wasn't set before the first frame, fill with background color */
173 5 gif_fill(frame, s->bg_color);
174 } else {
175 /* otherwise fill with transparent color.
176 * this is necessary since by default picture filled with 0x80808080. */
177 8 gif_fill(frame, s->trans_color);
178 }
179 }
180
181 /* verify that all the image is inside the screen dimensions */
182
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1294 if (!width || width > s->screen_width) {
183 av_log(s->avctx, AV_LOG_WARNING, "Invalid image width: %d, truncating.\n", width);
184 width = s->screen_width;
185 }
186
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1294 if (left >= s->screen_width) {
187 av_log(s->avctx, AV_LOG_ERROR, "Invalid left position: %d.\n", left);
188 return AVERROR_INVALIDDATA;
189 }
190
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1294 if (!height || height > s->screen_height) {
191 av_log(s->avctx, AV_LOG_WARNING, "Invalid image height: %d, truncating.\n", height);
192 height = s->screen_height;
193 }
194
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1294 if (top >= s->screen_height) {
195 av_log(s->avctx, AV_LOG_ERROR, "Invalid top position: %d.\n", top);
196 return AVERROR_INVALIDDATA;
197 }
198
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1294 if (left + width > s->screen_width) {
199 /* width must be kept around to avoid lzw vs line desync */
200 pw = s->screen_width - left;
201 av_log(s->avctx, AV_LOG_WARNING, "Image too wide by %d, truncating.\n",
202 left + width - s->screen_width);
203 } else {
204 1294 pw = width;
205 }
206
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1294 if (top + height > s->screen_height) {
207 /* we don't care about the extra invisible lines */
208 av_log(s->avctx, AV_LOG_WARNING, "Image too high by %d, truncating.\n",
209 top + height - s->screen_height);
210 height = s->screen_height - top;
211 }
212
213 /* process disposal method */
214
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1294 if (s->gce_prev_disposal == GCE_DISPOSAL_BACKGROUND) {
215 6 gif_fill_rect(frame, s->stored_bg_color, s->gce_l, s->gce_t, s->gce_w, s->gce_h);
216
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1288 } else if (s->gce_prev_disposal == GCE_DISPOSAL_RESTORE) {
217 1 gif_copy_img_rect(s->stored_img, (uint32_t *)frame->data[0],
218 1 frame->linesize[0] / sizeof(uint32_t), s->gce_l, s->gce_t, s->gce_w, s->gce_h);
219 }
220
221 1294 s->gce_prev_disposal = s->gce_disposal;
222
223
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1294 if (s->gce_disposal != GCE_DISPOSAL_NONE) {
224 1293 s->gce_l = left; s->gce_t = top;
225 1293 s->gce_w = pw; s->gce_h = height;
226
227
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1293 if (s->gce_disposal == GCE_DISPOSAL_BACKGROUND) {
228
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8 if (s->transparent_color_index >= 0)
229 8 s->stored_bg_color = s->trans_color;
230 else
231 s->stored_bg_color = s->bg_color;
232
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1285 } else if (s->gce_disposal == GCE_DISPOSAL_RESTORE) {
233 2 av_fast_malloc(&s->stored_img, &s->stored_img_size, frame->linesize[0] * frame->height);
234
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2 if (!s->stored_img)
235 return AVERROR(ENOMEM);
236
237 2 gif_copy_img_rect((uint32_t *)frame->data[0], s->stored_img,
238 2 frame->linesize[0] / sizeof(uint32_t), left, top, pw, height);
239 }
240 }
241
242 /* Expect at least 2 bytes: 1 for lzw code size and 1 for block size. */
243
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1294 if (bytestream2_get_bytes_left(&s->gb) < 2)
244 return AVERROR_INVALIDDATA;
245
246 /* now get the image data */
247 1294 code_size = bytestream2_get_byteu(&s->gb);
248
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1294 if ((ret = ff_lzw_decode_init(s->lzw, code_size, s->gb.buffer,
249 bytestream2_get_bytes_left(&s->gb), FF_LZW_GIF)) < 0) {
250 av_log(s->avctx, AV_LOG_ERROR, "LZW init failed\n");
251 return ret;
252 }
253
254 /* read all the image */
255 1294 linesize = frame->linesize[0] / sizeof(uint32_t);
256 1294 ptr1 = (uint32_t *)frame->data[0] + top * linesize + left;
257 1294 ptr = ptr1;
258 1294 pass = 0;
259 1294 y1 = 0;
260
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39267 for (y = 0; y < height; y++) {
261 37973 int count = ff_lzw_decode(s->lzw, s->idx_line, width);
262
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37973 if (count != width) {
263 if (count)
264 av_log(s->avctx, AV_LOG_ERROR, "LZW decode failed\n");
265 goto decode_tail;
266 }
267
268 37973 pr = ptr + pw;
269
270
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5366572 for (px = ptr, idx = s->idx_line; px < pr; px++, idx++) {
271
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5328599 if (*idx != s->transparent_color_index)
272 3988325 *px = pal[*idx];
273 }
274
275
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37973 if (is_interleaved) {
276 switch(pass) {
277 default:
278 case 0:
279 case 1:
280 y1 += 8;
281 ptr += linesize * 8;
282 break;
283 case 2:
284 y1 += 4;
285 ptr += linesize * 4;
286 break;
287 case 3:
288 y1 += 2;
289 ptr += linesize * 2;
290 break;
291 }
292 while (y1 >= height) {
293 y1 = 4 >> pass;
294 ptr = ptr1 + linesize * y1;
295 pass++;
296 }
297 } else {
298 37973 ptr += linesize;
299 }
300 }
301
302 1294 decode_tail:
303 /* read the garbage data until end marker is found */
304 1294 lzwed_len = ff_lzw_decode_tail(s->lzw);
305 1294 bytestream2_skipu(&s->gb, lzwed_len);
306
307 /* Graphic Control Extension's scope is single frame.
308 * Remove its influence. */
309 1294 s->transparent_color_index = -1;
310 1294 s->gce_disposal = GCE_DISPOSAL_NONE;
311
312 1294 return 0;
313 }
314
315 1303 static int gif_read_extension(GifState *s)
316 {
317 int ext_code, ext_len, gce_flags, gce_transparent_index;
318
319 /* There must be at least 2 bytes:
320 * 1 for extension label and 1 for extension length. */
321
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1303 if (bytestream2_get_bytes_left(&s->gb) < 2)
322 return AVERROR_INVALIDDATA;
323
324 1303 ext_code = bytestream2_get_byteu(&s->gb);
325 1303 ext_len = bytestream2_get_byteu(&s->gb);
326
327 ff_dlog(s->avctx, "ext_code=0x%x len=%d\n", ext_code, ext_len);
328
329
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1303 switch(ext_code) {
330 1294 case GIF_GCE_EXT_LABEL:
331
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1294 if (ext_len != 4)
332 goto discard_ext;
333
334 /* We need at least 5 bytes more: 4 is for extension body
335 * and 1 for next block size. */
336
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1294 if (bytestream2_get_bytes_left(&s->gb) < 5)
337 return AVERROR_INVALIDDATA;
338
339 1294 gce_flags = bytestream2_get_byteu(&s->gb);
340 1294 bytestream2_skipu(&s->gb, 2); // delay during which the frame is shown
341 1294 gce_transparent_index = bytestream2_get_byteu(&s->gb);
342
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1294 if (gce_flags & 0x01)
343 46 s->transparent_color_index = gce_transparent_index;
344 else
345 1248 s->transparent_color_index = -1;
346 1294 s->gce_disposal = (gce_flags >> 2) & 0x7;
347
348 ff_dlog(s->avctx, "gce_flags=%x tcolor=%d disposal=%d\n",
349 gce_flags,
350 s->transparent_color_index, s->gce_disposal);
351
352
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1294 if (s->gce_disposal > 3) {
353 s->gce_disposal = GCE_DISPOSAL_NONE;
354 ff_dlog(s->avctx, "invalid value in gce_disposal (%d). Using default value of 0.\n", ext_len);
355 }
356
357 1294 ext_len = bytestream2_get_byteu(&s->gb);
358 1294 break;
359 }
360
361 /* NOTE: many extension blocks can come after */
362 1303 discard_ext:
363
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1330 while (ext_len) {
364 /* There must be at least ext_len bytes and 1 for next block size byte. */
365
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27 if (bytestream2_get_bytes_left(&s->gb) < ext_len + 1)
366 return AVERROR_INVALIDDATA;
367
368 27 bytestream2_skipu(&s->gb, ext_len);
369 27 ext_len = bytestream2_get_byteu(&s->gb);
370
371 ff_dlog(s->avctx, "ext_len1=%d\n", ext_len);
372 }
373 1303 return 0;
374 }
375
376 13 static int gif_read_header1(GifState *s)
377 {
378 uint8_t sig[6];
379 int v, n;
380 int background_color_index;
381
382
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13 if (bytestream2_get_bytes_left(&s->gb) < 13)
383 return AVERROR_INVALIDDATA;
384
385 /* read gif signature */
386 13 bytestream2_get_bufferu(&s->gb, sig, 6);
387
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13 if (memcmp(sig, gif87a_sig, 6) &&
388
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13 memcmp(sig, gif89a_sig, 6))
389 return AVERROR_INVALIDDATA;
390
391 /* read screen header */
392 13 s->transparent_color_index = -1;
393 13 s->screen_width = bytestream2_get_le16u(&s->gb);
394 13 s->screen_height = bytestream2_get_le16u(&s->gb);
395
396 13 v = bytestream2_get_byteu(&s->gb);
397 13 s->color_resolution = ((v & 0x70) >> 4) + 1;
398 13 s->has_global_palette = (v & 0x80);
399 13 s->bits_per_pixel = (v & 0x07) + 1;
400 13 background_color_index = bytestream2_get_byteu(&s->gb);
401 13 n = bytestream2_get_byteu(&s->gb);
402
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13 if (n) {
403 s->avctx->sample_aspect_ratio.num = n + 15;
404 s->avctx->sample_aspect_ratio.den = 64;
405 }
406
407 ff_dlog(s->avctx, "screen_w=%d screen_h=%d bpp=%d global_palette=%d\n",
408 s->screen_width, s->screen_height, s->bits_per_pixel,
409 s->has_global_palette);
410
411
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13 if (s->has_global_palette) {
412 6 s->background_color_index = background_color_index;
413 6 n = 1 << s->bits_per_pixel;
414
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6 if (bytestream2_get_bytes_left(&s->gb) < n * 3)
415 return AVERROR_INVALIDDATA;
416
417 6 gif_read_palette(s, s->global_palette, n);
418 6 s->bg_color = s->global_palette[s->background_color_index];
419 } else
420 7 s->background_color_index = -1;
421
422 13 return 0;
423 }
424
425 1294 static int gif_parse_next_image(GifState *s, AVFrame *frame)
426 {
427
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2597 while (bytestream2_get_bytes_left(&s->gb) > 0) {
428 2597 int code = bytestream2_get_byte(&s->gb);
429 int ret;
430
431 2597 av_log(s->avctx, AV_LOG_DEBUG, "code=%02x '%c'\n", code, code);
432
433
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2597 switch (code) {
434 1294 case GIF_IMAGE_SEPARATOR:
435 1294 return gif_read_image(s, frame);
436 1303 case GIF_EXTENSION_INTRODUCER:
437
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1303 if ((ret = gif_read_extension(s)) < 0)
438 return ret;
439 1303 break;
440 case GIF_TRAILER:
441 /* end of image */
442 return AVERROR_EOF;
443 default:
444 /* erroneous block label */
445 return AVERROR_INVALIDDATA;
446 }
447 }
448 return AVERROR_EOF;
449 }
450
451 28 static av_cold int gif_decode_init(AVCodecContext *avctx)
452 {
453 28 GifState *s = avctx->priv_data;
454
455 28 s->avctx = avctx;
456
457 28 avctx->pix_fmt = AV_PIX_FMT_RGB32;
458 28 s->frame = av_frame_alloc();
459
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28 if (!s->frame)
460 return AVERROR(ENOMEM);
461 28 ff_lzw_decode_open(&s->lzw);
462
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28 if (!s->lzw)
463 return AVERROR(ENOMEM);
464 28 return 0;
465 }
466
467 1294 static int gif_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
468 {
469 1294 GifState *s = avctx->priv_data;
470 int ret;
471
472 1294 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
473
474 1294 s->frame->pts = avpkt->pts;
475 1294 s->frame->pkt_dts = avpkt->dts;
476 1294 s->frame->pkt_duration = avpkt->duration;
477
478
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1294 if (avpkt->size >= 6) {
479
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2588 s->keyframe = memcmp(avpkt->data, gif87a_sig, 6) == 0 ||
480
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1294 memcmp(avpkt->data, gif89a_sig, 6) == 0;
481 } else {
482 s->keyframe = 0;
483 }
484
485
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1294 if (s->keyframe) {
486 13 s->keyframe_ok = 0;
487 13 s->gce_prev_disposal = GCE_DISPOSAL_NONE;
488
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13 if ((ret = gif_read_header1(s)) < 0)
489 return ret;
490
491
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13 if ((ret = ff_set_dimensions(avctx, s->screen_width, s->screen_height)) < 0)
492 return ret;
493
494 13 av_frame_unref(s->frame);
495
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13 if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0)
496 return ret;
497
498 13 av_fast_malloc(&s->idx_line, &s->idx_line_size, s->screen_width);
499
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13 if (!s->idx_line)
500 return AVERROR(ENOMEM);
501
502 13 s->frame->pict_type = AV_PICTURE_TYPE_I;
503 13 s->frame->key_frame = 1;
504 13 s->keyframe_ok = 1;
505 } else {
506
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1281 if (!s->keyframe_ok) {
507 av_log(avctx, AV_LOG_ERROR, "cannot decode frame without keyframe\n");
508 return AVERROR_INVALIDDATA;
509 }
510
511
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1281 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
512 return ret;
513
514 1281 s->frame->pict_type = AV_PICTURE_TYPE_P;
515 1281 s->frame->key_frame = 0;
516 }
517
518 1294 ret = gif_parse_next_image(s, s->frame);
519
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1294 if (ret < 0)
520 return ret;
521
522
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1294 if ((ret = av_frame_ref(data, s->frame)) < 0)
523 return ret;
524 1294 *got_frame = 1;
525
526 1294 return bytestream2_tell(&s->gb);
527 }
528
529 28 static av_cold int gif_decode_close(AVCodecContext *avctx)
530 {
531 28 GifState *s = avctx->priv_data;
532
533 28 ff_lzw_decode_close(&s->lzw);
534 28 av_frame_free(&s->frame);
535 28 av_freep(&s->idx_line);
536 28 av_freep(&s->stored_img);
537
538 28 return 0;
539 }
540
541 static const AVOption options[] = {
542 { "trans_color", "color value (ARGB) that is used instead of transparent color",
543 offsetof(GifState, trans_color), AV_OPT_TYPE_INT,
544 {.i64 = GIF_TRANSPARENT_COLOR}, 0, 0xffffffff,
545 AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM },
546 { NULL },
547 };
548
549 static const AVClass decoder_class = {
550 .class_name = "gif decoder",
551 .item_name = av_default_item_name,
552 .option = options,
553 .version = LIBAVUTIL_VERSION_INT,
554 .category = AV_CLASS_CATEGORY_DECODER,
555 };
556
557 const AVCodec ff_gif_decoder = {
558 .name = "gif",
559 .long_name = NULL_IF_CONFIG_SMALL("GIF (Graphics Interchange Format)"),
560 .type = AVMEDIA_TYPE_VIDEO,
561 .id = AV_CODEC_ID_GIF,
562 .priv_data_size = sizeof(GifState),
563 .init = gif_decode_init,
564 .close = gif_decode_close,
565 .decode = gif_decode_frame,
566 .capabilities = AV_CODEC_CAP_DR1,
567 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
568 FF_CODEC_CAP_INIT_CLEANUP,
569 .priv_class = &decoder_class,
570 };
571