FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/gif.c
Date: 2024-07-17 14:05:47
Exec Total Coverage
Lines: 218 289 75.4%
Functions: 10 11 90.9%
Branches: 131 218 60.1%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2000 Fabrice Bellard
3 * Copyright (c) 2002 Francois Revol
4 * Copyright (c) 2006 Baptiste Coudurier
5 * Copyright (c) 2018 Bjorn Roche
6 * Copyright (c) 2018 Paul B Mahol
7 *
8 * first version by Francois Revol <revol@free.fr>
9 *
10 * This file is part of FFmpeg.
11 *
12 * FFmpeg is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
16 *
17 * FFmpeg is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with FFmpeg; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 */
26
27 /**
28 * @file
29 * GIF encoder
30 * @see http://www.w3.org/Graphics/GIF/spec-gif89a.txt
31 */
32
33 #include "libavutil/imgutils_internal.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/opt.h"
36 #include "avcodec.h"
37 #include "bytestream.h"
38 #include "codec_internal.h"
39 #include "encode.h"
40 #include "lzw.h"
41 #include "gif.h"
42
43 #define DEFAULT_TRANSPARENCY_INDEX 0x1f
44
45 typedef struct GIFContext {
46 const AVClass *class;
47 LZWState *lzw;
48 uint8_t *buf;
49 uint8_t *shrunk_buf;
50 int buf_size;
51 AVFrame *last_frame;
52 int flags;
53 int image;
54 int use_global_palette;
55 uint32_t palette[AVPALETTE_COUNT]; ///< local reference palette for !pal8
56 int palette_loaded;
57 int transparent_index;
58 uint8_t *tmpl; ///< temporary line buffer
59 } GIFContext;
60
61 enum {
62 GF_OFFSETTING = 1<<0,
63 GF_TRANSDIFF = 1<<1,
64 };
65
66 1 static void shrink_palette(const uint32_t *src, uint8_t *map,
67 uint32_t *dst, size_t *palette_count)
68 {
69 1 size_t colors_seen = 0;
70
71
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257 for (size_t i = 0; i < AVPALETTE_COUNT; i++) {
72 256 int seen = 0;
73
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32896 for (size_t c = 0; c < colors_seen; c++) {
74
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32640 if (src[i] == dst[c]) {
75 seen = 1;
76 break;
77 }
78 }
79
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256 if (!seen) {
80 256 dst[colors_seen] = src[i];
81 256 map[i] = colors_seen;
82 256 colors_seen++;
83 }
84 }
85
86 1 *palette_count = colors_seen;
87 1 }
88
89 1 static void remap_frame_to_palette(const uint8_t *src, int src_linesize,
90 uint8_t *dst, int dst_linesize,
91 int w, int h, uint8_t *map)
92 {
93
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218 for (int i = 0; i < h; i++)
94
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47306 for (int j = 0; j < w; j++)
95 47089 dst[i * dst_linesize + j] = map[src[i * src_linesize + j]];
96 1 }
97
98 1063 static int is_image_translucent(AVCodecContext *avctx,
99 const uint8_t *buf, const int linesize)
100 {
101 1063 GIFContext *s = avctx->priv_data;
102 1063 int trans = s->transparent_index;
103
104
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1063 if (trans < 0)
105 1063 return 0;
106
107 for (int y = 0; y < avctx->height; y++) {
108 for (int x = 0; x < avctx->width; x++) {
109 if (buf[x] == trans) {
110 return 1;
111 }
112 }
113 buf += linesize;
114 }
115
116 return 0;
117 }
118
119 39 static int get_palette_transparency_index(const uint32_t *palette)
120 {
121 39 int transparent_color_index = -1;
122 39 unsigned i, smallest_alpha = 0xff;
123
124
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39 if (!palette)
125 30 return -1;
126
127
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2313 for (i = 0; i < AVPALETTE_COUNT; i++) {
128 2304 const uint32_t v = palette[i];
129
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2304 if (v >> 24 < smallest_alpha) {
130 2 smallest_alpha = v >> 24;
131 2 transparent_color_index = i;
132 }
133 }
134
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9 return smallest_alpha < 128 ? transparent_color_index : -1;
135 }
136
137 1056 static int pick_palette_entry(const uint8_t *buf, int linesize, int w, int h)
138 {
139 1056 int histogram[AVPALETTE_COUNT] = {0};
140 int x, y, i;
141
142
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33543 for (y = 0; y < h; y++) {
143
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3190262 for (x = 0; x < w; x++)
144 3157775 histogram[buf[x]]++;
145 32487 buf += linesize;
146 }
147
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7312 for (i = 0; i < FF_ARRAY_ELEMS(histogram); i++)
148
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7288 if (!histogram[i])
149 1032 return i;
150 24 return -1;
151 }
152
153 static void gif_crop_translucent(AVCodecContext *avctx,
154 const uint8_t *buf, const int linesize,
155 int *width, int *height,
156 int *x_start, int *y_start)
157 {
158 GIFContext *s = avctx->priv_data;
159 int trans = s->transparent_index;
160
161 /* Crop image */
162 if ((s->flags & GF_OFFSETTING) && trans >= 0) {
163 const int w = avctx->width;
164 const int h = avctx->height;
165 int x_end = w - 1,
166 y_end = h - 1;
167
168 // crop top
169 while (*y_start < y_end) {
170 int is_trans = 1;
171 for (int i = 0; i < w; i++) {
172 if (buf[linesize * *y_start + i] != trans) {
173 is_trans = 0;
174 break;
175 }
176 }
177
178 if (!is_trans)
179 break;
180 (*y_start)++;
181 }
182
183 // crop bottom
184 while (y_end > *y_start) {
185 int is_trans = 1;
186 for (int i = 0; i < w; i++) {
187 if (buf[linesize * y_end + i] != trans) {
188 is_trans = 0;
189 break;
190 }
191 }
192 if (!is_trans)
193 break;
194 y_end--;
195 }
196
197 // crop left
198 while (*x_start < x_end) {
199 int is_trans = 1;
200 for (int i = *y_start; i < y_end; i++) {
201 if (buf[linesize * i + *x_start] != trans) {
202 is_trans = 0;
203 break;
204 }
205 }
206 if (!is_trans)
207 break;
208 (*x_start)++;
209 }
210
211 // crop right
212 while (x_end > *x_start) {
213 int is_trans = 1;
214 for (int i = *y_start; i < y_end; i++) {
215 if (buf[linesize * i + x_end] != trans) {
216 is_trans = 0;
217 break;
218 }
219 }
220 if (!is_trans)
221 break;
222 x_end--;
223 }
224
225 *height = y_end + 1 - *y_start;
226 *width = x_end + 1 - *x_start;
227 av_log(avctx, AV_LOG_DEBUG,"%dx%d image at pos (%d;%d) [area:%dx%d]\n",
228 *width, *height, *x_start, *y_start, avctx->width, avctx->height);
229 }
230 }
231
232 1063 static void gif_crop_opaque(AVCodecContext *avctx,
233 const uint32_t *palette,
234 const uint8_t *buf, const int linesize,
235 int *width, int *height, int *x_start, int *y_start)
236 {
237 1063 GIFContext *s = avctx->priv_data;
238
239 /* Crop image */
240
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1063 if ((s->flags & GF_OFFSETTING) && s->last_frame && !palette) {
241 1056 const uint8_t *ref = s->last_frame->data[0];
242 1056 const int ref_linesize = s->last_frame->linesize[0];
243 1056 int x_end = avctx->width - 1,
244 1056 y_end = avctx->height - 1;
245
246 /* skip common lines */
247
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100704 while (*y_start < y_end) {
248
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100704 if (memcmp(ref + *y_start*ref_linesize, buf + *y_start*linesize, *width))
249 1056 break;
250 99648 (*y_start)++;
251 }
252
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99777 while (y_end > *y_start) {
253
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99777 if (memcmp(ref + y_end*ref_linesize, buf + y_end*linesize, *width))
254 1056 break;
255 98721 y_end--;
256 }
257 1056 *height = y_end + 1 - *y_start;
258
259 /* skip common columns */
260
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96923 while (*x_start < x_end) {
261 96923 int same_column = 1;
262
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2498501 for (int y = *y_start; y <= y_end; y++) {
263
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2402634 if (ref[y*ref_linesize + *x_start] != buf[y*linesize + *x_start]) {
264 1056 same_column = 0;
265 1056 break;
266 }
267 }
268
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96923 if (!same_column)
269 1056 break;
270 95867 (*x_start)++;
271 }
272
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104460 while (x_end > *x_start) {
273 104460 int same_column = 1;
274
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2546113 for (int y = *y_start; y <= y_end; y++) {
275
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2442709 if (ref[y*ref_linesize + x_end] != buf[y*linesize + x_end]) {
276 1056 same_column = 0;
277 1056 break;
278 }
279 }
280
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104460 if (!same_column)
281 1056 break;
282 103404 x_end--;
283 }
284 1056 *width = x_end + 1 - *x_start;
285
286 1056 av_log(avctx, AV_LOG_DEBUG,"%dx%d image at pos (%d;%d) [area:%dx%d]\n",
287 *width, *height, *x_start, *y_start, avctx->width, avctx->height);
288 }
289 1063 }
290
291 1063 static int gif_image_write_image(AVCodecContext *avctx,
292 uint8_t **bytestream, uint8_t *end,
293 const uint32_t *palette,
294 const uint8_t *buf, const int linesize,
295 AVPacket *pkt)
296 {
297 1063 GIFContext *s = avctx->priv_data;
298 1063 int disposal, len = 0, height = avctx->height, width = avctx->width, x, y;
299 1063 int x_start = 0, y_start = 0, trans = s->transparent_index;
300
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1063 int bcid = -1, honor_transparency = (s->flags & GF_TRANSDIFF) && s->last_frame && !palette;
301 const uint8_t *ptr;
302 uint32_t shrunk_palette[AVPALETTE_COUNT];
303 1063 uint8_t map[AVPALETTE_COUNT] = { 0 };
304 1063 size_t shrunk_palette_count = 0;
305
306 /*
307 * We memset to 0xff instead of 0x00 so that the transparency detection
308 * doesn't pick anything after the palette entries as the transparency
309 * index, and because GIF89a requires us to always write a power-of-2
310 * number of palette entries.
311 */
312 1063 memset(shrunk_palette, 0xff, AVPALETTE_SIZE);
313
314
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1063 if (!s->image && is_image_translucent(avctx, buf, linesize)) {
315 gif_crop_translucent(avctx, buf, linesize, &width, &height, &x_start, &y_start);
316 honor_transparency = 0;
317 disposal = GCE_DISPOSAL_BACKGROUND;
318 } else {
319 1063 gif_crop_opaque(avctx, palette, buf, linesize, &width, &height, &x_start, &y_start);
320 1063 disposal = GCE_DISPOSAL_INPLACE;
321 }
322
323
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1063 if (s->image || !avctx->frame_num) { /* GIF header */
324
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7 const uint32_t *global_palette = palette ? palette : s->palette;
325 7 const AVRational sar = avctx->sample_aspect_ratio;
326 7 int64_t aspect = 0;
327
328
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7 if (sar.num > 0 && sar.den > 0) {
329 aspect = sar.num * 64LL / sar.den - 15;
330 if (aspect < 0 || aspect > 255)
331 aspect = 0;
332 }
333
334 7 bytestream_put_buffer(bytestream, gif89a_sig, sizeof(gif89a_sig));
335 7 bytestream_put_le16(bytestream, avctx->width);
336 7 bytestream_put_le16(bytestream, avctx->height);
337
338 7 bcid = get_palette_transparency_index(global_palette);
339
340
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7 bytestream_put_byte(bytestream, ((uint8_t) s->use_global_palette << 7) | 0x70 | (s->use_global_palette ? 7 : 0)); /* flags: global clut, 256 entries */
341
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7 bytestream_put_byte(bytestream, bcid < 0 ? DEFAULT_TRANSPARENCY_INDEX : bcid); /* background color index */
342 7 bytestream_put_byte(bytestream, aspect);
343
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7 if (s->use_global_palette) {
344
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1799 for (int i = 0; i < 256; i++) {
345 1792 const uint32_t v = global_palette[i] & 0xffffff;
346 1792 bytestream_put_be24(bytestream, v);
347 }
348 }
349 }
350
351
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1063 if (honor_transparency && trans < 0) {
352 1056 trans = pick_palette_entry(buf + y_start*linesize + x_start,
353 linesize, width, height);
354
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1056 if (trans < 0) // TODO, patch welcome
355 24 av_log(avctx, AV_LOG_DEBUG, "No available color, can not use transparency\n");
356 }
357
358
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1063 if (trans < 0)
359 31 honor_transparency = 0;
360
361
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1063 if (palette || !s->use_global_palette) {
362
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1 const uint32_t *pal = palette ? palette : s->palette;
363 1 shrink_palette(pal, map, shrunk_palette, &shrunk_palette_count);
364 }
365
366
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1063 bcid = honor_transparency || disposal == GCE_DISPOSAL_BACKGROUND ? trans : get_palette_transparency_index(palette);
367
368 /* graphic control extension */
369 1063 bytestream_put_byte(bytestream, GIF_EXTENSION_INTRODUCER);
370 1063 bytestream_put_byte(bytestream, GIF_GCE_EXT_LABEL);
371 1063 bytestream_put_byte(bytestream, 0x04); /* block size */
372 1063 bytestream_put_byte(bytestream, disposal<<2 | (bcid >= 0));
373 1063 bytestream_put_le16(bytestream, 5); // default delay
374
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1063 bytestream_put_byte(bytestream, bcid < 0 ? DEFAULT_TRANSPARENCY_INDEX : (shrunk_palette_count ? map[bcid] : bcid));
375 1063 bytestream_put_byte(bytestream, 0x00);
376
377 /* image block */
378 1063 bytestream_put_byte(bytestream, GIF_IMAGE_SEPARATOR);
379 1063 bytestream_put_le16(bytestream, x_start);
380 1063 bytestream_put_le16(bytestream, y_start);
381 1063 bytestream_put_le16(bytestream, width);
382 1063 bytestream_put_le16(bytestream, height);
383
384
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1064 if (palette || !s->use_global_palette) {
385 1 unsigned pow2_count = av_log2(shrunk_palette_count - 1);
386 unsigned i;
387
388 1 bytestream_put_byte(bytestream, 1<<7 | pow2_count); /* flags */
389
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257 for (i = 0; i < 1 << (pow2_count + 1); i++) {
390 256 const uint32_t v = shrunk_palette[i];
391 256 bytestream_put_be24(bytestream, v);
392 }
393 } else {
394 1062 bytestream_put_byte(bytestream, 0x00); /* flags */
395 }
396
397 1063 bytestream_put_byte(bytestream, 0x08);
398
399 1063 ff_lzw_encode_init(s->lzw, s->buf, s->buf_size,
400 12, FF_LZW_GIF, 1);
401
402
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1063 if (shrunk_palette_count) {
403
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1 if (!s->shrunk_buf) {
404 1 s->shrunk_buf = av_malloc(avctx->height * linesize);
405
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1 if (!s->shrunk_buf) {
406 av_log(avctx, AV_LOG_ERROR, "Could not allocated remapped frame buffer.\n");
407 return AVERROR(ENOMEM);
408 }
409 }
410 1 remap_frame_to_palette(buf, linesize, s->shrunk_buf, linesize, avctx->width, avctx->height, map);
411 1 ptr = s->shrunk_buf + y_start*linesize + x_start;
412 } else {
413 1062 ptr = buf + y_start*linesize + x_start;
414 }
415
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1063 if (honor_transparency) {
416 1032 const int ref_linesize = s->last_frame->linesize[0];
417 1032 const uint8_t *ref = s->last_frame->data[0] + y_start*ref_linesize + x_start;
418
419
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26607 for (y = 0; y < height; y++) {
420 25575 memcpy(s->tmpl, ptr, width);
421
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750326 for (x = 0; x < width; x++)
422
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724751 if (ref[x] == ptr[x])
423 367271 s->tmpl[x] = trans;
424 25575 len += ff_lzw_encode(s->lzw, s->tmpl, width);
425 25575 ptr += linesize;
426 25575 ref += ref_linesize;
427 }
428 } else {
429
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8533 for (y = 0; y < height; y++) {
430 8502 len += ff_lzw_encode(s->lzw, ptr, width);
431 8502 ptr += linesize;
432 }
433 }
434 1063 len += ff_lzw_encode_flush(s->lzw);
435
436 1063 ptr = s->buf;
437
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10314 while (len > 0) {
438 9251 int size = FFMIN(255, len);
439 9251 bytestream_put_byte(bytestream, size);
440
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9251 if (end - *bytestream < size)
441 return -1;
442 9251 bytestream_put_buffer(bytestream, ptr, size);
443 9251 ptr += size;
444 9251 len -= size;
445 }
446 1063 bytestream_put_byte(bytestream, 0x00); /* end of image block */
447 1063 return 0;
448 }
449
450 7 static av_cold int gif_encode_init(AVCodecContext *avctx)
451 {
452 7 GIFContext *s = avctx->priv_data;
453
454
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7 if (avctx->width > 65535 || avctx->height > 65535) {
455 av_log(avctx, AV_LOG_ERROR, "GIF does not support resolutions above 65535x65535\n");
456 return AVERROR(EINVAL);
457 }
458
459 7 s->transparent_index = -1;
460
461 7 s->lzw = av_mallocz(ff_lzw_encode_state_size);
462 7 s->buf_size = avctx->width*avctx->height*2 + 1000;
463 7 s->buf = av_malloc(s->buf_size);
464 7 s->tmpl = av_malloc(avctx->width);
465
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7 if (!s->tmpl || !s->buf || !s->lzw)
466 return AVERROR(ENOMEM);
467
468
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7 if (avpriv_set_systematic_pal2(s->palette, avctx->pix_fmt) < 0)
469
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1 av_assert0(avctx->pix_fmt == AV_PIX_FMT_PAL8);
470
471 7 return 0;
472 }
473
474 1063 static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
475 const AVFrame *pict, int *got_packet)
476 {
477 1063 GIFContext *s = avctx->priv_data;
478 uint8_t *outbuf_ptr, *end;
479 1063 const uint32_t *palette = NULL;
480 int ret;
481
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1063 if ((ret = ff_alloc_packet(avctx, pkt, avctx->width*avctx->height*7/5 + FF_INPUT_BUFFER_MIN_SIZE)) < 0)
483 return ret;
484 1063 outbuf_ptr = pkt->data;
485 1063 end = pkt->data + pkt->size;
486
487
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1063 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
488 173 palette = (uint32_t*)pict->data[1];
489
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173 if (!s->palette_loaded) {
491 1 memcpy(s->palette, palette, AVPALETTE_SIZE);
492 1 s->transparent_index = get_palette_transparency_index(palette);
493 1 s->palette_loaded = 1;
494
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172 } else if (!memcmp(s->palette, palette, AVPALETTE_SIZE)) {
495 172 palette = NULL;
496 }
497 }
498
499 1063 gif_image_write_image(avctx, &outbuf_ptr, end, palette,
500 1063 pict->data[0], pict->linesize[0], pkt);
501
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1063 if (!s->last_frame && !s->image) {
502 7 s->last_frame = av_frame_alloc();
503
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7 if (!s->last_frame)
504 return AVERROR(ENOMEM);
505 }
506
507
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1063 if (!s->image) {
508 1063 ret = av_frame_replace(s->last_frame, pict);
509
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1063 if (ret < 0)
510 return ret;
511 }
512
513 1063 pkt->size = outbuf_ptr - pkt->data;
514
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1063 if (s->image || !avctx->frame_num)
515 7 pkt->flags |= AV_PKT_FLAG_KEY;
516 1063 *got_packet = 1;
517
518 1063 return 0;
519 }
520
521 7 static int gif_encode_close(AVCodecContext *avctx)
522 {
523 7 GIFContext *s = avctx->priv_data;
524
525 7 av_freep(&s->lzw);
526 7 av_freep(&s->buf);
527 7 av_freep(&s->shrunk_buf);
528 7 s->buf_size = 0;
529 7 av_frame_free(&s->last_frame);
530 7 av_freep(&s->tmpl);
531 7 return 0;
532 }
533
534 #define OFFSET(x) offsetof(GIFContext, x)
535 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
536 static const AVOption gif_options[] = {
537 { "gifflags", "set GIF flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = GF_OFFSETTING|GF_TRANSDIFF}, 0, INT_MAX, FLAGS, .unit = "flags" },
538 { "offsetting", "enable picture offsetting", 0, AV_OPT_TYPE_CONST, {.i64=GF_OFFSETTING}, INT_MIN, INT_MAX, FLAGS, .unit = "flags" },
539 { "transdiff", "enable transparency detection between frames", 0, AV_OPT_TYPE_CONST, {.i64=GF_TRANSDIFF}, INT_MIN, INT_MAX, FLAGS, .unit = "flags" },
540 { "gifimage", "enable encoding only images per frame", OFFSET(image), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
541 { "global_palette", "write a palette to the global gif header where feasible", OFFSET(use_global_palette), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
542 { NULL }
543 };
544
545 static const AVClass gif_class = {
546 .class_name = "GIF encoder",
547 .item_name = av_default_item_name,
548 .option = gif_options,
549 .version = LIBAVUTIL_VERSION_INT,
550 };
551
552 const FFCodec ff_gif_encoder = {
553 .p.name = "gif",
554 CODEC_LONG_NAME("GIF (Graphics Interchange Format)"),
555 .p.type = AVMEDIA_TYPE_VIDEO,
556 .p.id = AV_CODEC_ID_GIF,
557 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
558 .priv_data_size = sizeof(GIFContext),
559 .init = gif_encode_init,
560 FF_CODEC_ENCODE_CB(gif_encode_frame),
561 .close = gif_encode_close,
562 .p.pix_fmts = (const enum AVPixelFormat[]){
563 AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
564 AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE
565 },
566 .p.priv_class = &gif_class,
567 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
568 };
569