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