]> git.sesse.net Git - ffmpeg/blob - libavfilter/vf_blend.c
Merge commit '5d2daebf3cc8de4cee1973db6a2229beaad3b7cd'
[ffmpeg] / libavfilter / vf_blend.c
1 /*
2  * Copyright (c) 2013 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 #include "libavutil/imgutils.h"
22 #include "libavutil/eval.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/pixfmt.h"
25 #include "avfilter.h"
26 #include "bufferqueue.h"
27 #include "formats.h"
28 #include "internal.h"
29 #include "dualinput.h"
30 #include "video.h"
31
32 #define TOP    0
33 #define BOTTOM 1
34
35 enum BlendMode {
36     BLEND_UNSET = -1,
37     BLEND_NORMAL,
38     BLEND_ADDITION,
39     BLEND_AND,
40     BLEND_AVERAGE,
41     BLEND_BURN,
42     BLEND_DARKEN,
43     BLEND_DIFFERENCE,
44     BLEND_DIFFERENCE128,
45     BLEND_DIVIDE,
46     BLEND_DODGE,
47     BLEND_EXCLUSION,
48     BLEND_HARDLIGHT,
49     BLEND_LIGHTEN,
50     BLEND_MULTIPLY,
51     BLEND_NEGATION,
52     BLEND_OR,
53     BLEND_OVERLAY,
54     BLEND_PHOENIX,
55     BLEND_PINLIGHT,
56     BLEND_REFLECT,
57     BLEND_SCREEN,
58     BLEND_SOFTLIGHT,
59     BLEND_SUBTRACT,
60     BLEND_VIVIDLIGHT,
61     BLEND_XOR,
62     BLEND_HARDMIX,
63     BLEND_LINEARLIGHT,
64     BLEND_GLOW,
65     BLEND_ADDITION128,
66     BLEND_NB
67 };
68
69 static const char *const var_names[] = {   "X",   "Y",   "W",   "H",   "SW",   "SH",   "T",   "N",   "A",   "B",   "TOP",   "BOTTOM",        NULL };
70 enum                                   { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_SW, VAR_SH, VAR_T, VAR_N, VAR_A, VAR_B, VAR_TOP, VAR_BOTTOM, VAR_VARS_NB };
71
72 typedef struct FilterParams {
73     enum BlendMode mode;
74     double opacity;
75     AVExpr *e;
76     char *expr_str;
77     void (*blend)(const uint8_t *top, int top_linesize,
78                   const uint8_t *bottom, int bottom_linesize,
79                   uint8_t *dst, int dst_linesize,
80                   int width, int start, int end,
81                   struct FilterParams *param, double *values);
82 } FilterParams;
83
84 typedef struct ThreadData {
85     const AVFrame *top, *bottom;
86     AVFrame *dst;
87     AVFilterLink *inlink;
88     int plane;
89     int w, h;
90     FilterParams *param;
91 } ThreadData;
92
93 typedef struct {
94     const AVClass *class;
95     FFDualInputContext dinput;
96     int hsub, vsub;             ///< chroma subsampling values
97     int nb_planes;
98     char *all_expr;
99     enum BlendMode all_mode;
100     double all_opacity;
101
102     FilterParams params[4];
103     int tblend;
104     AVFrame *prev_frame;        /* only used with tblend */
105 } BlendContext;
106
107 #define COMMON_OPTIONS \
108     { "c0_mode", "set component #0 blend mode", OFFSET(params[0].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
109     { "c1_mode", "set component #1 blend mode", OFFSET(params[1].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
110     { "c2_mode", "set component #2 blend mode", OFFSET(params[2].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
111     { "c3_mode", "set component #3 blend mode", OFFSET(params[3].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
112     { "all_mode", "set blend mode for all components", OFFSET(all_mode), AV_OPT_TYPE_INT, {.i64=-1},-1, BLEND_NB-1, FLAGS, "mode"},\
113     { "addition",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_ADDITION},   0, 0, FLAGS, "mode" },\
114     { "addition128", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_ADDITION128}, 0, 0, FLAGS, "mode" },\
115     { "and",        "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AND},        0, 0, FLAGS, "mode" },\
116     { "average",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AVERAGE},    0, 0, FLAGS, "mode" },\
117     { "burn",       "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_BURN},       0, 0, FLAGS, "mode" },\
118     { "darken",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DARKEN},     0, 0, FLAGS, "mode" },\
119     { "difference", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE}, 0, 0, FLAGS, "mode" },\
120     { "difference128", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE128}, 0, 0, FLAGS, "mode" },\
121     { "divide",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIVIDE},     0, 0, FLAGS, "mode" },\
122     { "dodge",      "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DODGE},      0, 0, FLAGS, "mode" },\
123     { "exclusion",  "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXCLUSION},  0, 0, FLAGS, "mode" },\
124     { "glow",       "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GLOW},       0, 0, FLAGS, "mode" },\
125     { "hardlight",  "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDLIGHT},  0, 0, FLAGS, "mode" },\
126     { "hardmix",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDMIX},    0, 0, FLAGS, "mode" },\
127     { "lighten",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LIGHTEN},    0, 0, FLAGS, "mode" },\
128     { "linearlight","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LINEARLIGHT},0, 0, FLAGS, "mode" },\
129     { "multiply",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY},   0, 0, FLAGS, "mode" },\
130     { "negation",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NEGATION},   0, 0, FLAGS, "mode" },\
131     { "normal",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NORMAL},     0, 0, FLAGS, "mode" },\
132     { "or",         "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OR},         0, 0, FLAGS, "mode" },\
133     { "overlay",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OVERLAY},    0, 0, FLAGS, "mode" },\
134     { "phoenix",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PHOENIX},    0, 0, FLAGS, "mode" },\
135     { "pinlight",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PINLIGHT},   0, 0, FLAGS, "mode" },\
136     { "reflect",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_REFLECT},    0, 0, FLAGS, "mode" },\
137     { "screen",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SCREEN},     0, 0, FLAGS, "mode" },\
138     { "softlight",  "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTLIGHT},  0, 0, FLAGS, "mode" },\
139     { "subtract",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SUBTRACT},   0, 0, FLAGS, "mode" },\
140     { "vividlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_VIVIDLIGHT}, 0, 0, FLAGS, "mode" },\
141     { "xor",        "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_XOR},        0, 0, FLAGS, "mode" },\
142     { "c0_expr",  "set color component #0 expression", OFFSET(params[0].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
143     { "c1_expr",  "set color component #1 expression", OFFSET(params[1].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
144     { "c2_expr",  "set color component #2 expression", OFFSET(params[2].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
145     { "c3_expr",  "set color component #3 expression", OFFSET(params[3].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
146     { "all_expr", "set expression for all color components", OFFSET(all_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
147     { "c0_opacity",  "set color component #0 opacity", OFFSET(params[0].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
148     { "c1_opacity",  "set color component #1 opacity", OFFSET(params[1].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
149     { "c2_opacity",  "set color component #2 opacity", OFFSET(params[2].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
150     { "c3_opacity",  "set color component #3 opacity", OFFSET(params[3].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
151     { "all_opacity", "set opacity for all color components", OFFSET(all_opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS}
152
153 #define OFFSET(x) offsetof(BlendContext, x)
154 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
155
156 static const AVOption blend_options[] = {
157     COMMON_OPTIONS,
158     { "shortest",    "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
159     { "repeatlast",  "repeat last bottom frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
160     { NULL }
161 };
162
163 AVFILTER_DEFINE_CLASS(blend);
164
165 static void blend_normal(const uint8_t *top, int top_linesize,
166                          const uint8_t *bottom, int bottom_linesize,
167                          uint8_t *dst, int dst_linesize,
168                          int width, int start, int end,
169                          FilterParams *param, double *values)
170 {
171     av_image_copy_plane(dst, dst_linesize, top, top_linesize, width, end - start);
172 }
173
174 #define DEFINE_BLEND8(name, expr)                                              \
175 static void blend_## name##_8bit(const uint8_t *top, int top_linesize,         \
176                                  const uint8_t *bottom, int bottom_linesize,   \
177                                  uint8_t *dst, int dst_linesize,               \
178                                  int width, int start, int end,                \
179                                  FilterParams *param, double *values)          \
180 {                                                                              \
181     double opacity = param->opacity;                                           \
182     int i, j;                                                                  \
183                                                                                \
184     for (i = start; i < end; i++) {                                            \
185         for (j = 0; j < width; j++) {                                          \
186             dst[j] = top[j] + ((expr) - top[j]) * opacity;                     \
187         }                                                                      \
188         dst    += dst_linesize;                                                \
189         top    += top_linesize;                                                \
190         bottom += bottom_linesize;                                             \
191     }                                                                          \
192 }
193
194 #define DEFINE_BLEND16(name, expr)                                             \
195 static void blend_## name##_16bit(const uint8_t *_top, int top_linesize,       \
196                                   const uint8_t *_bottom, int bottom_linesize, \
197                                   uint8_t *_dst, int dst_linesize,             \
198                                   int width, int start, int end,               \
199                                   FilterParams *param, double *values)         \
200 {                                                                              \
201     const uint16_t *top = (uint16_t*)_top;                                     \
202     const uint16_t *bottom = (uint16_t*)_bottom;                               \
203     uint16_t *dst = (uint16_t*)_dst;                                           \
204     double opacity = param->opacity;                                           \
205     int i, j;                                                                  \
206     dst_linesize /= 2;                                                         \
207     top_linesize /= 2;                                                         \
208     bottom_linesize /= 2;                                                      \
209                                                                                \
210     for (i = start; i < end; i++) {                                            \
211         for (j = 0; j < width; j++) {                                          \
212             dst[j] = top[j] + ((expr) - top[j]) * opacity;                     \
213         }                                                                      \
214         dst    += dst_linesize;                                                \
215         top    += top_linesize;                                                \
216         bottom += bottom_linesize;                                             \
217     }                                                                          \
218 }
219
220 #define A top[j]
221 #define B bottom[j]
222
223 #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 255))
224 #define SCREEN(x, a, b)   (255 - (x) * ((255 - (a)) * (255 - (b)) / 255))
225 #define BURN(a, b)        (((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a)))
226 #define DODGE(a, b)       (((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a)))))
227
228 DEFINE_BLEND8(addition,   FFMIN(255, A + B))
229 DEFINE_BLEND8(addition128, av_clip_uint8(A + B - 128))
230 DEFINE_BLEND8(average,    (A + B) / 2)
231 DEFINE_BLEND8(subtract,   FFMAX(0, A - B))
232 DEFINE_BLEND8(multiply,   MULTIPLY(1, A, B))
233 DEFINE_BLEND8(negation,   255 - FFABS(255 - A - B))
234 DEFINE_BLEND8(difference, FFABS(A - B))
235 DEFINE_BLEND8(difference128, av_clip_uint8(128 + A - B))
236 DEFINE_BLEND8(screen,     SCREEN(1, A, B))
237 DEFINE_BLEND8(overlay,    (A < 128) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))
238 DEFINE_BLEND8(hardlight,  (B < 128) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))
239 DEFINE_BLEND8(hardmix,    (A < (255 - B)) ? 0: 255)
240 DEFINE_BLEND8(darken,     FFMIN(A, B))
241 DEFINE_BLEND8(lighten,    FFMAX(A, B))
242 DEFINE_BLEND8(divide,     av_clip_uint8(((float)A / ((float)B) * 255)))
243 DEFINE_BLEND8(dodge,      DODGE(A, B))
244 DEFINE_BLEND8(burn,       BURN(A, B))
245 DEFINE_BLEND8(softlight,  (A > 127) ? B + (255 - B) * (A - 127.5) / 127.5 * (0.5 - FFABS(B - 127.5) / 255): B - B * ((127.5 - A) / 127.5) * (0.5 - FFABS(B - 127.5)/255))
246 DEFINE_BLEND8(exclusion,  A + B - 2 * A * B / 255)
247 DEFINE_BLEND8(pinlight,   (B < 128) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 128)))
248 DEFINE_BLEND8(phoenix,    FFMIN(A, B) - FFMAX(A, B) + 255)
249 DEFINE_BLEND8(reflect,    (B == 255) ? B : FFMIN(255, (A * A / (255 - B))))
250 DEFINE_BLEND8(glow,       (A == 255) ? A : FFMIN(255, (B * B / (255 - A))))
251 DEFINE_BLEND8(and,        A & B)
252 DEFINE_BLEND8(or,         A | B)
253 DEFINE_BLEND8(xor,        A ^ B)
254 DEFINE_BLEND8(vividlight, (A < 128) ? BURN(2 * A, B) : DODGE(2 * (A - 128), B))
255 DEFINE_BLEND8(linearlight,av_clip_uint8((B < 128) ? B + 2 * A - 255 : B + 2 * (A - 128)))
256
257 #undef MULTIPLY
258 #undef SCREEN
259 #undef BURN
260 #undef DODGE
261
262 #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 65535))
263 #define SCREEN(x, a, b)   (65535 - (x) * ((65535 - (a)) * (65535 - (b)) / 65535))
264 #define BURN(a, b)        (((a) == 0) ? (a) : FFMAX(0, 65535 - ((65535 - (b)) << 16) / (a)))
265 #define DODGE(a, b)       (((a) == 65535) ? (a) : FFMIN(65535, (((b) << 16) / (65535 - (a)))))
266
267 DEFINE_BLEND16(addition,   FFMIN(65535, A + B))
268 DEFINE_BLEND16(addition128, av_clip_uint16(A + B - 32768))
269 DEFINE_BLEND16(average,    (A + B) / 2)
270 DEFINE_BLEND16(subtract,   FFMAX(0, A - B))
271 DEFINE_BLEND16(multiply,   MULTIPLY(1, A, B))
272 DEFINE_BLEND16(negation,   65535 - FFABS(65535 - A - B))
273 DEFINE_BLEND16(difference, FFABS(A - B))
274 DEFINE_BLEND16(difference128, av_clip_uint16(32768 + A - B))
275 DEFINE_BLEND16(screen,     SCREEN(1, A, B))
276 DEFINE_BLEND16(overlay,    (A < 32768) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))
277 DEFINE_BLEND16(hardlight,  (B < 32768) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))
278 DEFINE_BLEND16(hardmix,    (A < (65535 - B)) ? 0: 65535)
279 DEFINE_BLEND16(darken,     FFMIN(A, B))
280 DEFINE_BLEND16(lighten,    FFMAX(A, B))
281 DEFINE_BLEND16(divide,     av_clip_uint16(((float)A / ((float)B) * 65535)))
282 DEFINE_BLEND16(dodge,      DODGE(A, B))
283 DEFINE_BLEND16(burn,       BURN(A, B))
284 DEFINE_BLEND16(softlight,  (A > 32767) ? B + (65535 - B) * (A - 32767.5) / 32767.5 * (0.5 - FFABS(B - 32767.5) / 65535): B - B * ((32767.5 - A) / 32767.5) * (0.5 - FFABS(B - 32767.5)/65535))
285 DEFINE_BLEND16(exclusion,  A + B - 2 * A * B / 65535)
286 DEFINE_BLEND16(pinlight,   (B < 32768) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 32768)))
287 DEFINE_BLEND16(phoenix,    FFMIN(A, B) - FFMAX(A, B) + 65535)
288 DEFINE_BLEND16(reflect,    (B == 65535) ? B : FFMIN(65535, (A * A / (65535 - B))))
289 DEFINE_BLEND16(glow,       (A == 65535) ? A : FFMIN(65535, (B * B / (65535 - A))))
290 DEFINE_BLEND16(and,        A & B)
291 DEFINE_BLEND16(or,         A | B)
292 DEFINE_BLEND16(xor,        A ^ B)
293 DEFINE_BLEND16(vividlight, (A < 32768) ? BURN(2 * A, B) : DODGE(2 * (A - 32768), B))
294 DEFINE_BLEND16(linearlight,av_clip_uint16((B < 32768) ? B + 2 * A - 65535 : B + 2 * (A - 32768)))
295
296 #define DEFINE_BLEND_EXPR(type, name, div)                                     \
297 static void blend_expr_## name(const uint8_t *_top, int top_linesize,          \
298                                const uint8_t *_bottom, int bottom_linesize,    \
299                                uint8_t *_dst, int dst_linesize,                \
300                                int width, int start, int end,                  \
301                                FilterParams *param, double *values)            \
302 {                                                                              \
303     const type *top = (type*)_top;                                             \
304     const type *bottom = (type*)_bottom;                                       \
305     type *dst = (type*)_dst;                                                   \
306     AVExpr *e = param->e;                                                      \
307     int y, x;                                                                  \
308     dst_linesize /= div;                                                       \
309     top_linesize /= div;                                                       \
310     bottom_linesize /= div;                                                    \
311                                                                                \
312     for (y = start; y < end; y++) {                                            \
313         values[VAR_Y] = y;                                                     \
314         for (x = 0; x < width; x++) {                                          \
315             values[VAR_X]      = x;                                            \
316             values[VAR_TOP]    = values[VAR_A] = top[x];                       \
317             values[VAR_BOTTOM] = values[VAR_B] = bottom[x];                    \
318             dst[x] = av_expr_eval(e, values, NULL);                            \
319         }                                                                      \
320         dst    += dst_linesize;                                                \
321         top    += top_linesize;                                                \
322         bottom += bottom_linesize;                                             \
323     }                                                                          \
324 }
325
326 DEFINE_BLEND_EXPR(uint8_t, 8bit, 1)
327 DEFINE_BLEND_EXPR(uint16_t, 16bit, 2)
328
329 static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
330 {
331     ThreadData *td = arg;
332     int slice_start = (td->h *  jobnr   ) / nb_jobs;
333     int slice_end   = (td->h * (jobnr+1)) / nb_jobs;
334     const uint8_t *top    = td->top->data[td->plane];
335     const uint8_t *bottom = td->bottom->data[td->plane];
336     uint8_t *dst    = td->dst->data[td->plane];
337     double values[VAR_VARS_NB];
338
339     values[VAR_N]  = td->inlink->frame_count;
340     values[VAR_T]  = td->dst->pts == AV_NOPTS_VALUE ? NAN : td->dst->pts * av_q2d(td->inlink->time_base);
341     values[VAR_W]  = td->w;
342     values[VAR_H]  = td->h;
343     values[VAR_SW] = td->w / (double)td->dst->width;
344     values[VAR_SH] = td->h / (double)td->dst->height;
345
346     td->param->blend(top + slice_start * td->top->linesize[td->plane],
347                      td->top->linesize[td->plane],
348                      bottom + slice_start * td->bottom->linesize[td->plane],
349                      td->bottom->linesize[td->plane],
350                      dst + slice_start * td->dst->linesize[td->plane],
351                      td->dst->linesize[td->plane],
352                      td->w, slice_start, slice_end, td->param, &values[0]);
353     return 0;
354 }
355
356 static AVFrame *blend_frame(AVFilterContext *ctx, AVFrame *top_buf,
357                             const AVFrame *bottom_buf)
358 {
359     BlendContext *s = ctx->priv;
360     AVFilterLink *inlink = ctx->inputs[0];
361     AVFilterLink *outlink = ctx->outputs[0];
362     AVFrame *dst_buf;
363     int plane;
364
365     dst_buf = ff_get_video_buffer(outlink, outlink->w, outlink->h);
366     if (!dst_buf)
367         return top_buf;
368     av_frame_copy_props(dst_buf, top_buf);
369
370     for (plane = 0; plane < s->nb_planes; plane++) {
371         int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
372         int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
373         int outw = FF_CEIL_RSHIFT(dst_buf->width,  hsub);
374         int outh = FF_CEIL_RSHIFT(dst_buf->height, vsub);
375         FilterParams *param = &s->params[plane];
376         ThreadData td = { .top = top_buf, .bottom = bottom_buf, .dst = dst_buf,
377                           .w = outw, .h = outh, .param = param, .plane = plane,
378                           .inlink = inlink };
379
380         ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outh, ctx->graph->nb_threads));
381     }
382
383     if (!s->tblend)
384         av_frame_free(&top_buf);
385
386     return dst_buf;
387 }
388
389 static av_cold int init(AVFilterContext *ctx)
390 {
391     BlendContext *s = ctx->priv;
392
393     s->tblend = !strcmp(ctx->filter->name, "tblend");
394
395     s->dinput.process = blend_frame;
396     return 0;
397 }
398
399 static int query_formats(AVFilterContext *ctx)
400 {
401     static const enum AVPixelFormat pix_fmts[] = {
402         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
403         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
404         AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
405         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8,
406         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
407         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
408         AV_PIX_FMT_GBRP16, AV_PIX_FMT_GRAY16,
409         AV_PIX_FMT_NONE
410     };
411
412     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
413     if (!fmts_list)
414         return AVERROR(ENOMEM);
415     return ff_set_common_formats(ctx, fmts_list);
416 }
417
418 static av_cold void uninit(AVFilterContext *ctx)
419 {
420     BlendContext *s = ctx->priv;
421     int i;
422
423     ff_dualinput_uninit(&s->dinput);
424     av_frame_free(&s->prev_frame);
425
426     for (i = 0; i < FF_ARRAY_ELEMS(s->params); i++)
427         av_expr_free(s->params[i].e);
428 }
429
430 static int config_output(AVFilterLink *outlink)
431 {
432     AVFilterContext *ctx = outlink->src;
433     AVFilterLink *toplink = ctx->inputs[TOP];
434     BlendContext *s = ctx->priv;
435     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(toplink->format);
436     int ret, plane, is_16bit;
437
438     if (!s->tblend) {
439         AVFilterLink *bottomlink = ctx->inputs[BOTTOM];
440
441         if (toplink->format != bottomlink->format) {
442             av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
443             return AVERROR(EINVAL);
444         }
445         if (toplink->w                       != bottomlink->w ||
446             toplink->h                       != bottomlink->h ||
447             toplink->sample_aspect_ratio.num != bottomlink->sample_aspect_ratio.num ||
448             toplink->sample_aspect_ratio.den != bottomlink->sample_aspect_ratio.den) {
449             av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
450                    "(size %dx%d, SAR %d:%d) do not match the corresponding "
451                    "second input link %s parameters (%dx%d, SAR %d:%d)\n",
452                    ctx->input_pads[TOP].name, toplink->w, toplink->h,
453                    toplink->sample_aspect_ratio.num,
454                    toplink->sample_aspect_ratio.den,
455                    ctx->input_pads[BOTTOM].name, bottomlink->w, bottomlink->h,
456                    bottomlink->sample_aspect_ratio.num,
457                    bottomlink->sample_aspect_ratio.den);
458             return AVERROR(EINVAL);
459         }
460     }
461
462     outlink->w = toplink->w;
463     outlink->h = toplink->h;
464     outlink->time_base = toplink->time_base;
465     outlink->sample_aspect_ratio = toplink->sample_aspect_ratio;
466     outlink->frame_rate = toplink->frame_rate;
467
468     s->hsub = pix_desc->log2_chroma_w;
469     s->vsub = pix_desc->log2_chroma_h;
470
471     is_16bit = pix_desc->comp[0].depth == 16;
472     s->nb_planes = av_pix_fmt_count_planes(toplink->format);
473
474     if (!s->tblend)
475         if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
476             return ret;
477
478     for (plane = 0; plane < FF_ARRAY_ELEMS(s->params); plane++) {
479         FilterParams *param = &s->params[plane];
480
481         if (s->all_mode >= 0)
482             param->mode = s->all_mode;
483         if (s->all_opacity < 1)
484             param->opacity = s->all_opacity;
485
486         switch (param->mode) {
487         case BLEND_ADDITION:   param->blend = is_16bit ? blend_addition_16bit   : blend_addition_8bit;   break;
488         case BLEND_ADDITION128: param->blend = is_16bit ? blend_addition128_16bit : blend_addition128_8bit; break;
489         case BLEND_AND:        param->blend = is_16bit ? blend_and_16bit        : blend_and_8bit;        break;
490         case BLEND_AVERAGE:    param->blend = is_16bit ? blend_average_16bit    : blend_average_8bit;    break;
491         case BLEND_BURN:       param->blend = is_16bit ? blend_burn_16bit       : blend_burn_8bit;       break;
492         case BLEND_DARKEN:     param->blend = is_16bit ? blend_darken_16bit     : blend_darken_8bit;     break;
493         case BLEND_DIFFERENCE: param->blend = is_16bit ? blend_difference_16bit : blend_difference_8bit; break;
494         case BLEND_DIFFERENCE128: param->blend = is_16bit ? blend_difference128_16bit: blend_difference128_8bit; break;
495         case BLEND_DIVIDE:     param->blend = is_16bit ? blend_divide_16bit     : blend_divide_8bit;     break;
496         case BLEND_DODGE:      param->blend = is_16bit ? blend_dodge_16bit      : blend_dodge_8bit;      break;
497         case BLEND_EXCLUSION:  param->blend = is_16bit ? blend_exclusion_16bit  : blend_exclusion_8bit;  break;
498         case BLEND_GLOW:       param->blend = is_16bit ? blend_glow_16bit       : blend_glow_8bit;       break;
499         case BLEND_HARDLIGHT:  param->blend = is_16bit ? blend_hardlight_16bit  : blend_hardlight_8bit;  break;
500         case BLEND_HARDMIX:    param->blend = is_16bit ? blend_hardmix_16bit    : blend_hardmix_8bit;    break;
501         case BLEND_LIGHTEN:    param->blend = is_16bit ? blend_lighten_16bit    : blend_lighten_8bit;    break;
502         case BLEND_LINEARLIGHT:param->blend = is_16bit ? blend_linearlight_16bit: blend_linearlight_8bit;break;
503         case BLEND_MULTIPLY:   param->blend = is_16bit ? blend_multiply_16bit   : blend_multiply_8bit;   break;
504         case BLEND_NEGATION:   param->blend = is_16bit ? blend_negation_16bit   : blend_negation_8bit;   break;
505         case BLEND_NORMAL:     param->blend = blend_normal;                                              break;
506         case BLEND_OR:         param->blend = is_16bit ? blend_or_16bit         : blend_or_8bit;         break;
507         case BLEND_OVERLAY:    param->blend = is_16bit ? blend_overlay_16bit    : blend_overlay_8bit;    break;
508         case BLEND_PHOENIX:    param->blend = is_16bit ? blend_phoenix_16bit    : blend_phoenix_8bit;    break;
509         case BLEND_PINLIGHT:   param->blend = is_16bit ? blend_pinlight_16bit   : blend_pinlight_8bit;   break;
510         case BLEND_REFLECT:    param->blend = is_16bit ? blend_reflect_16bit    : blend_reflect_8bit;    break;
511         case BLEND_SCREEN:     param->blend = is_16bit ? blend_screen_16bit     : blend_screen_8bit;     break;
512         case BLEND_SOFTLIGHT:  param->blend = is_16bit ? blend_softlight_16bit  : blend_softlight_8bit;  break;
513         case BLEND_SUBTRACT:   param->blend = is_16bit ? blend_subtract_16bit   : blend_subtract_8bit;   break;
514         case BLEND_VIVIDLIGHT: param->blend = is_16bit ? blend_vividlight_16bit : blend_vividlight_8bit; break;
515         case BLEND_XOR:        param->blend = is_16bit ? blend_xor_16bit        : blend_xor_8bit;        break;
516         }
517
518         if (s->all_expr && !param->expr_str) {
519             param->expr_str = av_strdup(s->all_expr);
520             if (!param->expr_str)
521                 return AVERROR(ENOMEM);
522         }
523         if (param->expr_str) {
524             ret = av_expr_parse(&param->e, param->expr_str, var_names,
525                                 NULL, NULL, NULL, NULL, 0, ctx);
526             if (ret < 0)
527                 return ret;
528             param->blend = is_16bit? blend_expr_16bit : blend_expr_8bit;
529         }
530     }
531
532     return 0;
533 }
534
535 #if CONFIG_BLEND_FILTER
536
537 static int request_frame(AVFilterLink *outlink)
538 {
539     BlendContext *s = outlink->src->priv;
540     return ff_dualinput_request_frame(&s->dinput, outlink);
541 }
542
543 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
544 {
545     BlendContext *s = inlink->dst->priv;
546     return ff_dualinput_filter_frame(&s->dinput, inlink, buf);
547 }
548
549 static const AVFilterPad blend_inputs[] = {
550     {
551         .name          = "top",
552         .type          = AVMEDIA_TYPE_VIDEO,
553         .filter_frame  = filter_frame,
554     },{
555         .name          = "bottom",
556         .type          = AVMEDIA_TYPE_VIDEO,
557         .filter_frame  = filter_frame,
558     },
559     { NULL }
560 };
561
562 static const AVFilterPad blend_outputs[] = {
563     {
564         .name          = "default",
565         .type          = AVMEDIA_TYPE_VIDEO,
566         .config_props  = config_output,
567         .request_frame = request_frame,
568     },
569     { NULL }
570 };
571
572 AVFilter ff_vf_blend = {
573     .name          = "blend",
574     .description   = NULL_IF_CONFIG_SMALL("Blend two video frames into each other."),
575     .init          = init,
576     .uninit        = uninit,
577     .priv_size     = sizeof(BlendContext),
578     .query_formats = query_formats,
579     .inputs        = blend_inputs,
580     .outputs       = blend_outputs,
581     .priv_class    = &blend_class,
582     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
583 };
584
585 #endif
586
587 #if CONFIG_TBLEND_FILTER
588
589 static int tblend_filter_frame(AVFilterLink *inlink, AVFrame *frame)
590 {
591     BlendContext *s = inlink->dst->priv;
592     AVFilterLink *outlink = inlink->dst->outputs[0];
593
594     if (s->prev_frame) {
595         AVFrame *out = blend_frame(inlink->dst, frame, s->prev_frame);
596         av_frame_free(&s->prev_frame);
597         s->prev_frame = frame;
598         return ff_filter_frame(outlink, out);
599     }
600     s->prev_frame = frame;
601     return 0;
602 }
603
604 static const AVOption tblend_options[] = {
605     COMMON_OPTIONS,
606     { NULL }
607 };
608
609 AVFILTER_DEFINE_CLASS(tblend);
610
611 static const AVFilterPad tblend_inputs[] = {
612     {
613         .name          = "default",
614         .type          = AVMEDIA_TYPE_VIDEO,
615         .filter_frame  = tblend_filter_frame,
616     },
617     { NULL }
618 };
619
620 static const AVFilterPad tblend_outputs[] = {
621     {
622         .name          = "default",
623         .type          = AVMEDIA_TYPE_VIDEO,
624         .config_props  = config_output,
625     },
626     { NULL }
627 };
628
629 AVFilter ff_vf_tblend = {
630     .name          = "tblend",
631     .description   = NULL_IF_CONFIG_SMALL("Blend successive frames."),
632     .priv_size     = sizeof(BlendContext),
633     .priv_class    = &tblend_class,
634     .query_formats = query_formats,
635     .init          = init,
636     .uninit        = uninit,
637     .inputs        = tblend_inputs,
638     .outputs       = tblend_outputs,
639     .flags         = AVFILTER_FLAG_SLICE_THREADS,
640 };
641
642 #endif