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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/attributes.h" | ||
34 | #include "libavutil/imgutils_internal.h" | ||
35 | #include "libavutil/mem.h" | ||
36 | #include "libavutil/opt.h" | ||
37 | #include "avcodec.h" | ||
38 | #include "bytestream.h" | ||
39 | #include "codec_internal.h" | ||
40 | #include "encode.h" | ||
41 | #include "lzw.h" | ||
42 | #include "gif.h" | ||
43 | |||
44 | #define DEFAULT_TRANSPARENCY_INDEX 0x1f | ||
45 | |||
46 | typedef struct GIFContext { | ||
47 | const AVClass *class; | ||
48 | LZWState *lzw; | ||
49 | uint8_t *buf; | ||
50 | uint8_t *shrunk_buf; | ||
51 | int buf_size; | ||
52 | AVFrame *last_frame; | ||
53 | int flags; | ||
54 | int image; | ||
55 | int use_global_palette; | ||
56 | uint32_t palette[AVPALETTE_COUNT]; ///< local reference palette for !pal8 | ||
57 | int palette_loaded; | ||
58 | int transparent_index; | ||
59 | uint8_t *tmpl; ///< temporary line buffer | ||
60 | } GIFContext; | ||
61 | |||
62 | enum { | ||
63 | GF_OFFSETTING = 1<<0, | ||
64 | GF_TRANSDIFF = 1<<1, | ||
65 | }; | ||
66 | |||
67 | 1 | static void shrink_palette(const uint32_t *src, uint8_t *map, | |
68 | uint32_t *dst, size_t *palette_count) | ||
69 | { | ||
70 | 1 | size_t colors_seen = 0; | |
71 | |||
72 |
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257 | for (size_t i = 0; i < AVPALETTE_COUNT; i++) { |
73 | 256 | int seen = 0; | |
74 |
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32896 | for (size_t c = 0; c < colors_seen; c++) { |
75 |
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32640 | if (src[i] == dst[c]) { |
76 | ✗ | seen = 1; | |
77 | ✗ | break; | |
78 | } | ||
79 | } | ||
80 |
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256 | if (!seen) { |
81 | 256 | dst[colors_seen] = src[i]; | |
82 | 256 | map[i] = colors_seen; | |
83 | 256 | colors_seen++; | |
84 | } | ||
85 | } | ||
86 | |||
87 | 1 | *palette_count = colors_seen; | |
88 | 1 | } | |
89 | |||
90 | 1 | static void remap_frame_to_palette(const uint8_t *src, int src_linesize, | |
91 | uint8_t *dst, int dst_linesize, | ||
92 | int w, int h, uint8_t *map) | ||
93 | { | ||
94 |
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218 | for (int i = 0; i < h; i++) |
95 |
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47306 | for (int j = 0; j < w; j++) |
96 | 47089 | dst[i * dst_linesize + j] = map[src[i * src_linesize + j]]; | |
97 | 1 | } | |
98 | |||
99 | 1063 | static int is_image_translucent(AVCodecContext *avctx, | |
100 | const uint8_t *buf, const int linesize) | ||
101 | { | ||
102 | 1063 | GIFContext *s = avctx->priv_data; | |
103 | 1063 | int trans = s->transparent_index; | |
104 | |||
105 |
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1063 | if (trans < 0) |
106 | 1063 | return 0; | |
107 | |||
108 | ✗ | for (int y = 0; y < avctx->height; y++) { | |
109 | ✗ | for (int x = 0; x < avctx->width; x++) { | |
110 | ✗ | if (buf[x] == trans) { | |
111 | ✗ | return 1; | |
112 | } | ||
113 | } | ||
114 | ✗ | buf += linesize; | |
115 | } | ||
116 | |||
117 | ✗ | return 0; | |
118 | } | ||
119 | |||
120 | 39 | static int get_palette_transparency_index(const uint32_t *palette) | |
121 | { | ||
122 | 39 | int transparent_color_index = -1; | |
123 | 39 | unsigned i, smallest_alpha = 0xff; | |
124 | |||
125 |
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39 | if (!palette) |
126 | 30 | return -1; | |
127 | |||
128 |
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2313 | for (i = 0; i < AVPALETTE_COUNT; i++) { |
129 | 2304 | const uint32_t v = palette[i]; | |
130 |
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2304 | if (v >> 24 < smallest_alpha) { |
131 | 2 | smallest_alpha = v >> 24; | |
132 | 2 | transparent_color_index = i; | |
133 | } | ||
134 | } | ||
135 |
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9 | return smallest_alpha < 128 ? transparent_color_index : -1; |
136 | } | ||
137 | |||
138 | 1056 | static int pick_palette_entry(const uint8_t *buf, int linesize, int w, int h) | |
139 | { | ||
140 | 1056 | int histogram[AVPALETTE_COUNT] = {0}; | |
141 | int x, y, i; | ||
142 | |||
143 |
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33543 | for (y = 0; y < h; y++) { |
144 |
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3190262 | for (x = 0; x < w; x++) |
145 | 3157775 | histogram[buf[x]]++; | |
146 | 32487 | buf += linesize; | |
147 | } | ||
148 |
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7312 | for (i = 0; i < FF_ARRAY_ELEMS(histogram); i++) |
149 |
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7288 | if (!histogram[i]) |
150 | 1032 | return i; | |
151 | 24 | return -1; | |
152 | } | ||
153 | |||
154 | ✗ | static void gif_crop_translucent(AVCodecContext *avctx, | |
155 | const uint8_t *buf, const int linesize, | ||
156 | int *width, int *height, | ||
157 | int *x_start, int *y_start) | ||
158 | { | ||
159 | ✗ | GIFContext *s = avctx->priv_data; | |
160 | ✗ | int trans = s->transparent_index; | |
161 | |||
162 | /* Crop image */ | ||
163 | ✗ | if ((s->flags & GF_OFFSETTING) && trans >= 0) { | |
164 | ✗ | const int w = avctx->width; | |
165 | ✗ | const int h = avctx->height; | |
166 | ✗ | int x_end = w - 1, | |
167 | ✗ | y_end = h - 1; | |
168 | |||
169 | // crop top | ||
170 | ✗ | while (*y_start < y_end) { | |
171 | ✗ | int is_trans = 1; | |
172 | ✗ | for (int i = 0; i < w; i++) { | |
173 | ✗ | if (buf[linesize * *y_start + i] != trans) { | |
174 | ✗ | is_trans = 0; | |
175 | ✗ | break; | |
176 | } | ||
177 | } | ||
178 | |||
179 | ✗ | if (!is_trans) | |
180 | ✗ | break; | |
181 | ✗ | (*y_start)++; | |
182 | } | ||
183 | |||
184 | // crop bottom | ||
185 | ✗ | while (y_end > *y_start) { | |
186 | ✗ | int is_trans = 1; | |
187 | ✗ | for (int i = 0; i < w; i++) { | |
188 | ✗ | if (buf[linesize * y_end + i] != trans) { | |
189 | ✗ | is_trans = 0; | |
190 | ✗ | break; | |
191 | } | ||
192 | } | ||
193 | ✗ | if (!is_trans) | |
194 | ✗ | break; | |
195 | ✗ | y_end--; | |
196 | } | ||
197 | |||
198 | // crop left | ||
199 | ✗ | while (*x_start < x_end) { | |
200 | ✗ | int is_trans = 1; | |
201 | ✗ | for (int i = *y_start; i < y_end; i++) { | |
202 | ✗ | if (buf[linesize * i + *x_start] != trans) { | |
203 | ✗ | is_trans = 0; | |
204 | ✗ | break; | |
205 | } | ||
206 | } | ||
207 | ✗ | if (!is_trans) | |
208 | ✗ | break; | |
209 | ✗ | (*x_start)++; | |
210 | } | ||
211 | |||
212 | // crop right | ||
213 | ✗ | while (x_end > *x_start) { | |
214 | ✗ | int is_trans = 1; | |
215 | ✗ | for (int i = *y_start; i < y_end; i++) { | |
216 | ✗ | if (buf[linesize * i + x_end] != trans) { | |
217 | ✗ | is_trans = 0; | |
218 | ✗ | break; | |
219 | } | ||
220 | } | ||
221 | ✗ | if (!is_trans) | |
222 | ✗ | break; | |
223 | ✗ | x_end--; | |
224 | } | ||
225 | |||
226 | ✗ | *height = y_end + 1 - *y_start; | |
227 | ✗ | *width = x_end + 1 - *x_start; | |
228 | ✗ | av_log(avctx, AV_LOG_DEBUG,"%dx%d image at pos (%d;%d) [area:%dx%d]\n", | |
229 | *width, *height, *x_start, *y_start, avctx->width, avctx->height); | ||
230 | } | ||
231 | ✗ | } | |
232 | |||
233 | 1063 | static void gif_crop_opaque(AVCodecContext *avctx, | |
234 | const uint32_t *palette, | ||
235 | const uint8_t *buf, const int linesize, | ||
236 | int *width, int *height, int *x_start, int *y_start) | ||
237 | { | ||
238 | 1063 | GIFContext *s = avctx->priv_data; | |
239 | |||
240 | /* Crop image */ | ||
241 |
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1063 | if ((s->flags & GF_OFFSETTING) && s->last_frame && !palette) { |
242 | 1056 | const uint8_t *ref = s->last_frame->data[0]; | |
243 | 1056 | const int ref_linesize = s->last_frame->linesize[0]; | |
244 | 1056 | int x_end = avctx->width - 1, | |
245 | 1056 | y_end = avctx->height - 1; | |
246 | |||
247 | /* skip common lines */ | ||
248 |
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100704 | while (*y_start < y_end) { |
249 |
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100704 | if (memcmp(ref + *y_start*ref_linesize, buf + *y_start*linesize, *width)) |
250 | 1056 | break; | |
251 | 99648 | (*y_start)++; | |
252 | } | ||
253 |
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99777 | while (y_end > *y_start) { |
254 |
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99777 | if (memcmp(ref + y_end*ref_linesize, buf + y_end*linesize, *width)) |
255 | 1056 | break; | |
256 | 98721 | y_end--; | |
257 | } | ||
258 | 1056 | *height = y_end + 1 - *y_start; | |
259 | |||
260 | /* skip common columns */ | ||
261 |
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96923 | while (*x_start < x_end) { |
262 | 96923 | int same_column = 1; | |
263 |
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2498501 | for (int y = *y_start; y <= y_end; y++) { |
264 |
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2402634 | if (ref[y*ref_linesize + *x_start] != buf[y*linesize + *x_start]) { |
265 | 1056 | same_column = 0; | |
266 | 1056 | break; | |
267 | } | ||
268 | } | ||
269 |
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96923 | if (!same_column) |
270 | 1056 | break; | |
271 | 95867 | (*x_start)++; | |
272 | } | ||
273 |
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104460 | while (x_end > *x_start) { |
274 | 104460 | int same_column = 1; | |
275 |
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2546113 | for (int y = *y_start; y <= y_end; y++) { |
276 |
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2442709 | if (ref[y*ref_linesize + x_end] != buf[y*linesize + x_end]) { |
277 | 1056 | same_column = 0; | |
278 | 1056 | break; | |
279 | } | ||
280 | } | ||
281 |
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104460 | if (!same_column) |
282 | 1056 | break; | |
283 | 103404 | x_end--; | |
284 | } | ||
285 | 1056 | *width = x_end + 1 - *x_start; | |
286 | |||
287 | 1056 | av_log(avctx, AV_LOG_DEBUG,"%dx%d image at pos (%d;%d) [area:%dx%d]\n", | |
288 | *width, *height, *x_start, *y_start, avctx->width, avctx->height); | ||
289 | } | ||
290 | 1063 | } | |
291 | |||
292 | 1063 | static int gif_image_write_image(AVCodecContext *avctx, | |
293 | uint8_t **bytestream, uint8_t *end, | ||
294 | const uint32_t *palette, | ||
295 | const uint8_t *buf, const int linesize, | ||
296 | AVPacket *pkt) | ||
297 | { | ||
298 | 1063 | GIFContext *s = avctx->priv_data; | |
299 | 1063 | int disposal, len = 0, height = avctx->height, width = avctx->width, x, y; | |
300 | 1063 | int x_start = 0, y_start = 0, trans = s->transparent_index; | |
301 |
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1063 | int bcid = -1, honor_transparency = (s->flags & GF_TRANSDIFF) && s->last_frame && !palette; |
302 | const uint8_t *ptr; | ||
303 | uint32_t shrunk_palette[AVPALETTE_COUNT]; | ||
304 | 1063 | uint8_t map[AVPALETTE_COUNT] = { 0 }; | |
305 | 1063 | size_t shrunk_palette_count = 0; | |
306 | |||
307 | /* | ||
308 | * We memset to 0xff instead of 0x00 so that the transparency detection | ||
309 | * doesn't pick anything after the palette entries as the transparency | ||
310 | * index, and because GIF89a requires us to always write a power-of-2 | ||
311 | * number of palette entries. | ||
312 | */ | ||
313 | 1063 | memset(shrunk_palette, 0xff, AVPALETTE_SIZE); | |
314 | |||
315 |
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1063 | if (!s->image && is_image_translucent(avctx, buf, linesize)) { |
316 | ✗ | gif_crop_translucent(avctx, buf, linesize, &width, &height, &x_start, &y_start); | |
317 | ✗ | honor_transparency = 0; | |
318 | ✗ | disposal = GCE_DISPOSAL_BACKGROUND; | |
319 | } else { | ||
320 | 1063 | gif_crop_opaque(avctx, palette, buf, linesize, &width, &height, &x_start, &y_start); | |
321 | 1063 | disposal = GCE_DISPOSAL_INPLACE; | |
322 | } | ||
323 | |||
324 |
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1063 | if (s->image || !avctx->frame_num) { /* GIF header */ |
325 |
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7 | const uint32_t *global_palette = palette ? palette : s->palette; |
326 | 7 | const AVRational sar = avctx->sample_aspect_ratio; | |
327 | 7 | int64_t aspect = 0; | |
328 | |||
329 |
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7 | if (sar.num > 0 && sar.den > 0) { |
330 | ✗ | aspect = sar.num * 64LL / sar.den - 15; | |
331 | ✗ | if (aspect < 0 || aspect > 255) | |
332 | ✗ | aspect = 0; | |
333 | } | ||
334 | |||
335 | 7 | bytestream_put_buffer(bytestream, gif89a_sig, sizeof(gif89a_sig)); | |
336 | 7 | bytestream_put_le16(bytestream, avctx->width); | |
337 | 7 | bytestream_put_le16(bytestream, avctx->height); | |
338 | |||
339 | 7 | bcid = get_palette_transparency_index(global_palette); | |
340 | |||
341 |
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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 */ |
342 |
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7 | bytestream_put_byte(bytestream, bcid < 0 ? DEFAULT_TRANSPARENCY_INDEX : bcid); /* background color index */ |
343 | 7 | bytestream_put_byte(bytestream, aspect); | |
344 |
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7 | if (s->use_global_palette) { |
345 |
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1799 | for (int i = 0; i < 256; i++) { |
346 | 1792 | const uint32_t v = global_palette[i] & 0xffffff; | |
347 | 1792 | bytestream_put_be24(bytestream, v); | |
348 | } | ||
349 | } | ||
350 | } | ||
351 | |||
352 |
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1063 | if (honor_transparency && trans < 0) { |
353 | 1056 | trans = pick_palette_entry(buf + y_start*linesize + x_start, | |
354 | linesize, width, height); | ||
355 |
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1056 | if (trans < 0) // TODO, patch welcome |
356 | 24 | av_log(avctx, AV_LOG_DEBUG, "No available color, can not use transparency\n"); | |
357 | } | ||
358 | |||
359 |
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1063 | if (trans < 0) |
360 | 31 | honor_transparency = 0; | |
361 | |||
362 |
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1063 | if (palette || !s->use_global_palette) { |
363 |
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1 | const uint32_t *pal = palette ? palette : s->palette; |
364 | 1 | shrink_palette(pal, map, shrunk_palette, &shrunk_palette_count); | |
365 | } | ||
366 | |||
367 |
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1063 | bcid = honor_transparency || disposal == GCE_DISPOSAL_BACKGROUND ? trans : get_palette_transparency_index(palette); |
368 | |||
369 | /* graphic control extension */ | ||
370 | 1063 | bytestream_put_byte(bytestream, GIF_EXTENSION_INTRODUCER); | |
371 | 1063 | bytestream_put_byte(bytestream, GIF_GCE_EXT_LABEL); | |
372 | 1063 | bytestream_put_byte(bytestream, 0x04); /* block size */ | |
373 | 1063 | bytestream_put_byte(bytestream, disposal<<2 | (bcid >= 0)); | |
374 | 1063 | bytestream_put_le16(bytestream, 5); // default delay | |
375 |
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1063 | bytestream_put_byte(bytestream, bcid < 0 ? DEFAULT_TRANSPARENCY_INDEX : (shrunk_palette_count ? map[bcid] : bcid)); |
376 | 1063 | bytestream_put_byte(bytestream, 0x00); | |
377 | |||
378 | /* image block */ | ||
379 | 1063 | bytestream_put_byte(bytestream, GIF_IMAGE_SEPARATOR); | |
380 | 1063 | bytestream_put_le16(bytestream, x_start); | |
381 | 1063 | bytestream_put_le16(bytestream, y_start); | |
382 | 1063 | bytestream_put_le16(bytestream, width); | |
383 | 1063 | bytestream_put_le16(bytestream, height); | |
384 | |||
385 |
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1064 | if (palette || !s->use_global_palette) { |
386 | 1 | unsigned pow2_count = av_log2(shrunk_palette_count - 1); | |
387 | unsigned i; | ||
388 | |||
389 | 1 | bytestream_put_byte(bytestream, 1<<7 | pow2_count); /* flags */ | |
390 |
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257 | for (i = 0; i < 1 << (pow2_count + 1); i++) { |
391 | 256 | const uint32_t v = shrunk_palette[i]; | |
392 | 256 | bytestream_put_be24(bytestream, v); | |
393 | } | ||
394 | } else { | ||
395 | 1062 | bytestream_put_byte(bytestream, 0x00); /* flags */ | |
396 | } | ||
397 | |||
398 | 1063 | bytestream_put_byte(bytestream, 0x08); | |
399 | |||
400 | 1063 | ff_lzw_encode_init(s->lzw, s->buf, s->buf_size, | |
401 | 12, FF_LZW_GIF, 1); | ||
402 | |||
403 |
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1063 | if (shrunk_palette_count) { |
404 |
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1 | if (!s->shrunk_buf) { |
405 | 1 | s->shrunk_buf = av_malloc(avctx->height * linesize); | |
406 |
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1 | if (!s->shrunk_buf) { |
407 | ✗ | av_log(avctx, AV_LOG_ERROR, "Could not allocated remapped frame buffer.\n"); | |
408 | ✗ | return AVERROR(ENOMEM); | |
409 | } | ||
410 | } | ||
411 | 1 | remap_frame_to_palette(buf, linesize, s->shrunk_buf, linesize, avctx->width, avctx->height, map); | |
412 | 1 | ptr = s->shrunk_buf + y_start*linesize + x_start; | |
413 | } else { | ||
414 | 1062 | ptr = buf + y_start*linesize + x_start; | |
415 | } | ||
416 |
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1063 | if (honor_transparency) { |
417 | 1032 | const int ref_linesize = s->last_frame->linesize[0]; | |
418 | 1032 | const uint8_t *ref = s->last_frame->data[0] + y_start*ref_linesize + x_start; | |
419 | |||
420 |
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26607 | for (y = 0; y < height; y++) { |
421 | 25575 | memcpy(s->tmpl, ptr, width); | |
422 |
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750326 | for (x = 0; x < width; x++) |
423 |
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724751 | if (ref[x] == ptr[x]) |
424 | 367271 | s->tmpl[x] = trans; | |
425 | 25575 | len += ff_lzw_encode(s->lzw, s->tmpl, width); | |
426 | 25575 | ptr += linesize; | |
427 | 25575 | ref += ref_linesize; | |
428 | } | ||
429 | } else { | ||
430 |
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8533 | for (y = 0; y < height; y++) { |
431 | 8502 | len += ff_lzw_encode(s->lzw, ptr, width); | |
432 | 8502 | ptr += linesize; | |
433 | } | ||
434 | } | ||
435 | 1063 | len += ff_lzw_encode_flush(s->lzw); | |
436 | |||
437 | 1063 | ptr = s->buf; | |
438 |
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10314 | while (len > 0) { |
439 | 9251 | int size = FFMIN(255, len); | |
440 | 9251 | bytestream_put_byte(bytestream, size); | |
441 |
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9251 | if (end - *bytestream < size) |
442 | ✗ | return -1; | |
443 | 9251 | bytestream_put_buffer(bytestream, ptr, size); | |
444 | 9251 | ptr += size; | |
445 | 9251 | len -= size; | |
446 | } | ||
447 | 1063 | bytestream_put_byte(bytestream, 0x00); /* end of image block */ | |
448 | 1063 | return 0; | |
449 | } | ||
450 | |||
451 | 7 | static av_cold int gif_encode_init(AVCodecContext *avctx) | |
452 | { | ||
453 | 7 | GIFContext *s = avctx->priv_data; | |
454 | |||
455 |
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7 | if (avctx->width > 65535 || avctx->height > 65535) { |
456 | ✗ | av_log(avctx, AV_LOG_ERROR, "GIF does not support resolutions above 65535x65535\n"); | |
457 | ✗ | return AVERROR(EINVAL); | |
458 | } | ||
459 | |||
460 | 7 | s->transparent_index = -1; | |
461 | |||
462 | 7 | s->lzw = av_mallocz(ff_lzw_encode_state_size); | |
463 | 7 | s->buf_size = avctx->width*avctx->height*2 + 1000; | |
464 | 7 | s->buf = av_malloc(s->buf_size); | |
465 | 7 | s->tmpl = av_malloc(avctx->width); | |
466 |
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7 | if (!s->tmpl || !s->buf || !s->lzw) |
467 | ✗ | return AVERROR(ENOMEM); | |
468 | |||
469 |
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7 | if (avpriv_set_systematic_pal2(s->palette, avctx->pix_fmt) < 0) |
470 |
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1 | av_assert0(avctx->pix_fmt == AV_PIX_FMT_PAL8); |
471 | |||
472 | 7 | return 0; | |
473 | } | ||
474 | |||
475 | 1063 | static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt, | |
476 | const AVFrame *pict, int *got_packet) | ||
477 | { | ||
478 | 1063 | GIFContext *s = avctx->priv_data; | |
479 | uint8_t *outbuf_ptr, *end; | ||
480 | 1063 | const uint32_t *palette = NULL; | |
481 | int ret; | ||
482 | |||
483 |
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1063 | if ((ret = ff_alloc_packet(avctx, pkt, avctx->width*avctx->height*7/5 + FF_INPUT_BUFFER_MIN_SIZE)) < 0) |
484 | ✗ | return ret; | |
485 | 1063 | outbuf_ptr = pkt->data; | |
486 | 1063 | end = pkt->data + pkt->size; | |
487 | |||
488 |
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1063 | if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { |
489 | 173 | palette = (uint32_t*)pict->data[1]; | |
490 | |||
491 |
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173 | if (!s->palette_loaded) { |
492 | 1 | memcpy(s->palette, palette, AVPALETTE_SIZE); | |
493 | 1 | s->transparent_index = get_palette_transparency_index(palette); | |
494 | 1 | s->palette_loaded = 1; | |
495 |
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172 | } else if (!memcmp(s->palette, palette, AVPALETTE_SIZE)) { |
496 | 172 | palette = NULL; | |
497 | } | ||
498 | } | ||
499 | |||
500 | 1063 | gif_image_write_image(avctx, &outbuf_ptr, end, palette, | |
501 | 1063 | pict->data[0], pict->linesize[0], pkt); | |
502 |
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1063 | if (!s->last_frame && !s->image) { |
503 | 7 | s->last_frame = av_frame_alloc(); | |
504 |
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7 | if (!s->last_frame) |
505 | ✗ | return AVERROR(ENOMEM); | |
506 | } | ||
507 | |||
508 |
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1063 | if (!s->image) { |
509 | 1063 | ret = av_frame_replace(s->last_frame, pict); | |
510 |
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1063 | if (ret < 0) |
511 | ✗ | return ret; | |
512 | } | ||
513 | |||
514 | 1063 | pkt->size = outbuf_ptr - pkt->data; | |
515 |
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1063 | if (s->image || !avctx->frame_num) |
516 | 7 | pkt->flags |= AV_PKT_FLAG_KEY; | |
517 | 1063 | *got_packet = 1; | |
518 | |||
519 | 1063 | return 0; | |
520 | } | ||
521 | |||
522 | 7 | static av_cold int gif_encode_close(AVCodecContext *avctx) | |
523 | { | ||
524 | 7 | GIFContext *s = avctx->priv_data; | |
525 | |||
526 | 7 | av_freep(&s->lzw); | |
527 | 7 | av_freep(&s->buf); | |
528 | 7 | av_freep(&s->shrunk_buf); | |
529 | 7 | s->buf_size = 0; | |
530 | 7 | av_frame_free(&s->last_frame); | |
531 | 7 | av_freep(&s->tmpl); | |
532 | 7 | return 0; | |
533 | } | ||
534 | |||
535 | #define OFFSET(x) offsetof(GIFContext, x) | ||
536 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM | ||
537 | static const AVOption gif_options[] = { | ||
538 | { "gifflags", "set GIF flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = GF_OFFSETTING|GF_TRANSDIFF}, 0, INT_MAX, FLAGS, .unit = "flags" }, | ||
539 | { "offsetting", "enable picture offsetting", 0, AV_OPT_TYPE_CONST, {.i64=GF_OFFSETTING}, INT_MIN, INT_MAX, FLAGS, .unit = "flags" }, | ||
540 | { "transdiff", "enable transparency detection between frames", 0, AV_OPT_TYPE_CONST, {.i64=GF_TRANSDIFF}, INT_MIN, INT_MAX, FLAGS, .unit = "flags" }, | ||
541 | { "gifimage", "enable encoding only images per frame", OFFSET(image), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS }, | ||
542 | { "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 }, | ||
543 | { NULL } | ||
544 | }; | ||
545 | |||
546 | static const AVClass gif_class = { | ||
547 | .class_name = "GIF encoder", | ||
548 | .item_name = av_default_item_name, | ||
549 | .option = gif_options, | ||
550 | .version = LIBAVUTIL_VERSION_INT, | ||
551 | }; | ||
552 | |||
553 | const FFCodec ff_gif_encoder = { | ||
554 | .p.name = "gif", | ||
555 | CODEC_LONG_NAME("GIF (Graphics Interchange Format)"), | ||
556 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
557 | .p.id = AV_CODEC_ID_GIF, | ||
558 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, | ||
559 | .priv_data_size = sizeof(GIFContext), | ||
560 | .init = gif_encode_init, | ||
561 | FF_CODEC_ENCODE_CB(gif_encode_frame), | ||
562 | .close = gif_encode_close, | ||
563 | CODEC_PIXFMTS(AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, | ||
564 | AV_PIX_FMT_BGR4_BYTE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8), | ||
565 | .p.priv_class = &gif_class, | ||
566 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
567 | }; | ||
568 |