| 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/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 |