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FFmpeg/libavfilter/vf_blend.c

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  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 "formats.h"

  27. #include "framesync.h"

  28. #include "internal.h"

  29. #include "video.h"

  30. #include "blend.h"

  31. 

  32. #define TOP    0

  33. #define BOTTOM 1

  34. 

  35. typedef struct BlendContext {

  36.     const AVClass *class;

  37.     FFFrameSync fs;

  38.     int hsub, vsub;             ///< chroma subsampling values

  39.     int nb_planes;

  40.     char *all_expr;

  41.     enum BlendMode all_mode;

  42.     double all_opacity;

  43. 

  44.     int depth;

  45.     FilterParams params[4];

  46.     int tblend;

  47.     AVFrame *prev_frame;        /* only used with tblend */

  48. } BlendContext;

  49. 

  50. static const char *const var_names[] = {   "X",   "Y",   "W",   "H",   "SW",   "SH",   "T",   "N",   "A",   "B",   "TOP",   "BOTTOM",        NULL };

  51. 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 };

  52. 

  53. typedef struct ThreadData {

  54.     const AVFrame *top, *bottom;

  55.     AVFrame *dst;

  56.     AVFilterLink *inlink;

  57.     int plane;

  58.     int w, h;

  59.     FilterParams *param;

  60. } ThreadData;

  61. 

  62. #define COMMON_OPTIONS \

  63.     { "c0_mode", "set component #0 blend mode", OFFSET(params[0].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\

  64.     { "c1_mode", "set component #1 blend mode", OFFSET(params[1].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\

  65.     { "c2_mode", "set component #2 blend mode", OFFSET(params[2].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\

  66.     { "c3_mode", "set component #3 blend mode", OFFSET(params[3].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\

  67.     { "all_mode", "set blend mode for all components", OFFSET(all_mode), AV_OPT_TYPE_INT, {.i64=-1},-1, BLEND_NB-1, FLAGS, "mode"},\

  68.     { "addition",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_ADDITION},   0, 0, FLAGS, "mode" },\

  69.     { "addition128","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GRAINMERGE}, 0, 0, FLAGS, "mode" },\

  70.     { "grainmerge", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GRAINMERGE}, 0, 0, FLAGS, "mode" },\

  71.     { "and",        "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AND},        0, 0, FLAGS, "mode" },\

  72.     { "average",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AVERAGE},    0, 0, FLAGS, "mode" },\

  73.     { "burn",       "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_BURN},       0, 0, FLAGS, "mode" },\

  74.     { "darken",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DARKEN},     0, 0, FLAGS, "mode" },\

  75.     { "difference", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE}, 0, 0, FLAGS, "mode" },\

  76.     { "difference128", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GRAINEXTRACT}, 0, 0, FLAGS, "mode" },\

  77.     { "grainextract", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GRAINEXTRACT}, 0, 0, FLAGS, "mode" },\

  78.     { "divide",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIVIDE},     0, 0, FLAGS, "mode" },\

  79.     { "dodge",      "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DODGE},      0, 0, FLAGS, "mode" },\

  80.     { "exclusion",  "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXCLUSION},  0, 0, FLAGS, "mode" },\

  81.     { "extremity",  "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXTREMITY},  0, 0, FLAGS, "mode" },\

  82.     { "freeze",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_FREEZE},     0, 0, FLAGS, "mode" },\

  83.     { "glow",       "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GLOW},       0, 0, FLAGS, "mode" },\

  84.     { "hardlight",  "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDLIGHT},  0, 0, FLAGS, "mode" },\

  85.     { "hardmix",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDMIX},    0, 0, FLAGS, "mode" },\

  86.     { "heat",       "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HEAT},       0, 0, FLAGS, "mode" },\

  87.     { "lighten",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LIGHTEN},    0, 0, FLAGS, "mode" },\

  88.     { "linearlight","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LINEARLIGHT},0, 0, FLAGS, "mode" },\

  89.     { "multiply",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY},   0, 0, FLAGS, "mode" },\

  90.     { "multiply128","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY128},0, 0, FLAGS, "mode" },\

  91.     { "negation",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NEGATION},   0, 0, FLAGS, "mode" },\

  92.     { "normal",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NORMAL},     0, 0, FLAGS, "mode" },\

  93.     { "or",         "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OR},         0, 0, FLAGS, "mode" },\

  94.     { "overlay",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OVERLAY},    0, 0, FLAGS, "mode" },\

  95.     { "phoenix",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PHOENIX},    0, 0, FLAGS, "mode" },\

  96.     { "pinlight",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PINLIGHT},   0, 0, FLAGS, "mode" },\

  97.     { "reflect",    "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_REFLECT},    0, 0, FLAGS, "mode" },\

  98.     { "screen",     "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SCREEN},     0, 0, FLAGS, "mode" },\

  99.     { "softlight",  "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTLIGHT},  0, 0, FLAGS, "mode" },\

  100.     { "subtract",   "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SUBTRACT},   0, 0, FLAGS, "mode" },\

  101.     { "vividlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_VIVIDLIGHT}, 0, 0, FLAGS, "mode" },\

  102.     { "xor",        "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_XOR},        0, 0, FLAGS, "mode" },\

  103.     { "c0_expr",  "set color component #0 expression", OFFSET(params[0].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

  104.     { "c1_expr",  "set color component #1 expression", OFFSET(params[1].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

  105.     { "c2_expr",  "set color component #2 expression", OFFSET(params[2].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

  106.     { "c3_expr",  "set color component #3 expression", OFFSET(params[3].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

  107.     { "all_expr", "set expression for all color components", OFFSET(all_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

  108.     { "c0_opacity",  "set color component #0 opacity", OFFSET(params[0].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\

  109.     { "c1_opacity",  "set color component #1 opacity", OFFSET(params[1].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\

  110.     { "c2_opacity",  "set color component #2 opacity", OFFSET(params[2].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\

  111.     { "c3_opacity",  "set color component #3 opacity", OFFSET(params[3].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\

  112.     { "all_opacity", "set opacity for all color components", OFFSET(all_opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS}

  113. 

  114. #define OFFSET(x) offsetof(BlendContext, x)

  115. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  116. 

  117. static const AVOption blend_options[] = {

  118.     COMMON_OPTIONS,

  119.     { NULL }

  120. };

  121. 

  122. FRAMESYNC_DEFINE_CLASS(blend, BlendContext, fs);

  123. 

  124. #define COPY(src, depth)                                                            \

  125. static void blend_copy ## src##_##depth(const uint8_t *top, ptrdiff_t top_linesize,    \

  126.                             const uint8_t *bottom, ptrdiff_t bottom_linesize,\

  127.                             uint8_t *dst, ptrdiff_t dst_linesize,            \

  128.                             ptrdiff_t width, ptrdiff_t height,               \

  129.                             FilterParams *param, double *values, int starty) \

  130. {                                                                            \

  131.     av_image_copy_plane(dst, dst_linesize, src, src ## _linesize,            \

  132.                         width * depth / 8, height);                          \

  133. }

  134. 

  135. COPY(top, 8)

  136. COPY(bottom, 8)

  137. 

  138. COPY(top, 16)

  139. COPY(bottom, 16)

  140. 

  141. #undef COPY

  142. 

  143. static void blend_normal_8bit(const uint8_t *top, ptrdiff_t top_linesize,

  144.                               const uint8_t *bottom, ptrdiff_t bottom_linesize,

  145.                               uint8_t *dst, ptrdiff_t dst_linesize,

  146.                               ptrdiff_t width, ptrdiff_t height,

  147.                               FilterParams *param, double *values, int starty)

  148. {

  149.     const double opacity = param->opacity;

  150.     int i, j;

  151. 

  152.     for (i = 0; i < height; i++) {

  153.         for (j = 0; j < width; j++) {

  154.             dst[j] = top[j] * opacity + bottom[j] * (1. - opacity);

  155.         }

  156.         dst    += dst_linesize;

  157.         top    += top_linesize;

  158.         bottom += bottom_linesize;

  159.     }

  160. }

  161. 

  162. static void blend_normal_16bit(const uint8_t *_top, ptrdiff_t top_linesize,

  163.                                   const uint8_t *_bottom, ptrdiff_t bottom_linesize,

  164.                                   uint8_t *_dst, ptrdiff_t dst_linesize,

  165.                                   ptrdiff_t width, ptrdiff_t height,

  166.                                   FilterParams *param, double *values, int starty)

  167. {

  168.     const uint16_t *top = (uint16_t*)_top;

  169.     const uint16_t *bottom = (uint16_t*)_bottom;

  170.     uint16_t *dst = (uint16_t*)_dst;

  171.     const double opacity = param->opacity;

  172.     int i, j;

  173.     dst_linesize /= 2;

  174.     top_linesize /= 2;

  175.     bottom_linesize /= 2;

  176. 

  177.     for (i = 0; i < height; i++) {

  178.         for (j = 0; j < width; j++) {

  179.             dst[j] = top[j] * opacity + bottom[j] * (1. - opacity);

  180.         }

  181.         dst    += dst_linesize;

  182.         top    += top_linesize;

  183.         bottom += bottom_linesize;

  184.     }

  185. }

  186. 

  187. #define DEFINE_BLEND8(name, expr)                                              \

  188. static void blend_## name##_8bit(const uint8_t *top, ptrdiff_t top_linesize,         \

  189.                                  const uint8_t *bottom, ptrdiff_t bottom_linesize,   \

  190.                                  uint8_t *dst, ptrdiff_t dst_linesize,               \

  191.                                  ptrdiff_t width, ptrdiff_t height,                \

  192.                                  FilterParams *param, double *values, int starty) \

  193. {                                                                              \

  194.     double opacity = param->opacity;                                           \

  195.     int i, j;                                                                  \

  196.                                                                                \

  197.     for (i = 0; i < height; i++) {                                             \

  198.         for (j = 0; j < width; j++) {                                          \

  199.             dst[j] = top[j] + ((expr) - top[j]) * opacity;                     \

  200.         }                                                                      \

  201.         dst    += dst_linesize;                                                \

  202.         top    += top_linesize;                                                \

  203.         bottom += bottom_linesize;                                             \

  204.     }                                                                          \

  205. }

  206. 

  207. #define DEFINE_BLEND16(name, expr, depth)                                            \

  208. static void blend_## name##_##depth##bit(const uint8_t *_top, ptrdiff_t top_linesize,\

  209.                                   const uint8_t *_bottom, ptrdiff_t bottom_linesize, \

  210.                                   uint8_t *_dst, ptrdiff_t dst_linesize,             \

  211.                                   ptrdiff_t width, ptrdiff_t height,           \

  212.                                   FilterParams *param, double *values, int starty)         \

  213. {                                                                              \

  214.     const uint16_t *top = (const uint16_t*)_top;                               \

  215.     const uint16_t *bottom = (const uint16_t*)_bottom;                         \

  216.     uint16_t *dst = (uint16_t*)_dst;                                           \

  217.     double opacity = param->opacity;                                           \

  218.     int i, j;                                                                  \

  219.     dst_linesize /= 2;                                                         \

  220.     top_linesize /= 2;                                                         \

  221.     bottom_linesize /= 2;                                                      \

  222.                                                                                \

  223.     for (i = 0; i < height; i++) {                                             \

  224.         for (j = 0; j < width; j++) {                                          \

  225.             dst[j] = top[j] + ((expr) - top[j]) * opacity;                     \

  226.         }                                                                      \

  227.         dst    += dst_linesize;                                                \

  228.         top    += top_linesize;                                                \

  229.         bottom += bottom_linesize;                                             \

  230.     }                                                                          \

  231. }

  232. 

  233. #define A top[j]

  234. #define B bottom[j]

  235. 

  236. #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 255))

  237. #define SCREEN(x, a, b)   (255 - (x) * ((255 - (a)) * (255 - (b)) / 255))

  238. #define BURN(a, b)        (((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a)))

  239. #define DODGE(a, b)       (((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a)))))

  240. 

  241. DEFINE_BLEND8(addition,   FFMIN(255, A + B))

  242. DEFINE_BLEND8(grainmerge, av_clip_uint8(A + B - 128))

  243. DEFINE_BLEND8(average,    (A + B) / 2)

  244. DEFINE_BLEND8(subtract,   FFMAX(0, A - B))

  245. DEFINE_BLEND8(multiply,   MULTIPLY(1, A, B))

  246. DEFINE_BLEND8(multiply128,av_clip_uint8((A - 128) * B / 32. + 128))

  247. DEFINE_BLEND8(negation,   255 - FFABS(255 - A - B))

  248. DEFINE_BLEND8(extremity,  FFABS(255 - A - B))

  249. DEFINE_BLEND8(difference, FFABS(A - B))

  250. DEFINE_BLEND8(grainextract, av_clip_uint8(128 + A - B))

  251. DEFINE_BLEND8(screen,     SCREEN(1, A, B))

  252. DEFINE_BLEND8(overlay,    (A < 128) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))

  253. DEFINE_BLEND8(hardlight,  (B < 128) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))

  254. DEFINE_BLEND8(hardmix,    (A < (255 - B)) ? 0: 255)

  255. DEFINE_BLEND8(heat,       (A == 0) ? 0 : 255 - FFMIN(((255 - B) * (255 - B)) / A, 255))

  256. DEFINE_BLEND8(freeze,     (B == 0) ? 0 : 255 - FFMIN(((255 - A) * (255 - A)) / B, 255))

  257. DEFINE_BLEND8(darken,     FFMIN(A, B))

  258. DEFINE_BLEND8(lighten,    FFMAX(A, B))

  259. DEFINE_BLEND8(divide,     av_clip_uint8(B == 0 ? 255 : 255 * A / B))

  260. DEFINE_BLEND8(dodge,      DODGE(A, B))

  261. DEFINE_BLEND8(burn,       BURN(A, B))

  262. DEFINE_BLEND8(softlight,  (A > 127) ? B + (255 - B) * (A - 127.5) / 127.5 * (0.5 - fabs(B - 127.5) / 255): B - B * ((127.5 - A) / 127.5) * (0.5 - fabs(B - 127.5)/255))

  263. DEFINE_BLEND8(exclusion,  A + B - 2 * A * B / 255)

  264. DEFINE_BLEND8(pinlight,   (B < 128) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 128)))

  265. DEFINE_BLEND8(phoenix,    FFMIN(A, B) - FFMAX(A, B) + 255)

  266. DEFINE_BLEND8(reflect,    (B == 255) ? B : FFMIN(255, (A * A / (255 - B))))

  267. DEFINE_BLEND8(glow,       (A == 255) ? A : FFMIN(255, (B * B / (255 - A))))

  268. DEFINE_BLEND8(and,        A & B)

  269. DEFINE_BLEND8(or,         A | B)

  270. DEFINE_BLEND8(xor,        A ^ B)

  271. DEFINE_BLEND8(vividlight, (A < 128) ? BURN(2 * A, B) : DODGE(2 * (A - 128), B))

  272. DEFINE_BLEND8(linearlight,av_clip_uint8((B < 128) ? B + 2 * A - 255 : B + 2 * (A - 128)))

  273. 

  274. #undef MULTIPLY

  275. #undef SCREEN

  276. #undef BURN

  277. #undef DODGE

  278. 

  279. #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 65535))

  280. #define SCREEN(x, a, b)   (65535 - (x) * ((65535 - (a)) * (65535 - (b)) / 65535))

  281. #define BURN(a, b)        (((a) == 0) ? (a) : FFMAX(0, 65535 - ((65535 - (b)) << 16) / (a)))

  282. #define DODGE(a, b)       (((a) == 65535) ? (a) : FFMIN(65535, (((b) << 16) / (65535 - (a)))))

  283. 

  284. DEFINE_BLEND16(addition,   FFMIN(65535, A + B), 16)

  285. DEFINE_BLEND16(grainmerge, av_clip_uint16(A + B - 32768), 16)

  286. DEFINE_BLEND16(average,    (A + B) / 2, 16)

  287. DEFINE_BLEND16(subtract,   FFMAX(0, A - B), 16)

  288. DEFINE_BLEND16(multiply,   MULTIPLY(1, A, B), 16)

  289. DEFINE_BLEND16(multiply128, av_clip_uint16((A - 32768) * B / 8192. + 32768), 16)

  290. DEFINE_BLEND16(negation,   65535 - FFABS(65535 - A - B), 16)

  291. DEFINE_BLEND16(extremity,  FFABS(65535 - A - B), 16)

  292. DEFINE_BLEND16(difference, FFABS(A - B), 16)

  293. DEFINE_BLEND16(grainextract, av_clip_uint16(32768 + A - B), 16)

  294. DEFINE_BLEND16(screen,     SCREEN(1, A, B), 16)

  295. DEFINE_BLEND16(overlay,    (A < 32768) ? MULTIPLY(2, A, B) : SCREEN(2, A, B), 16)

  296. DEFINE_BLEND16(hardlight,  (B < 32768) ? MULTIPLY(2, B, A) : SCREEN(2, B, A), 16)

  297. DEFINE_BLEND16(hardmix,    (A < (65535 - B)) ? 0: 65535, 16)

  298. DEFINE_BLEND16(heat,       (A == 0) ? 0 : 65535 - FFMIN(((65535 - B) * (65535 - B)) / A, 65535), 16)

  299. DEFINE_BLEND16(freeze,     (B == 0) ? 0 : 65535 - FFMIN(((65535 - A) * (65535 - A)) / B, 65535), 16)

  300. DEFINE_BLEND16(darken,     FFMIN(A, B), 16)

  301. DEFINE_BLEND16(lighten,    FFMAX(A, B), 16)

  302. DEFINE_BLEND16(divide,     av_clip_uint16(B == 0 ? 65535 : 65535 * A / B), 16)

  303. DEFINE_BLEND16(dodge,      DODGE(A, B), 16)

  304. DEFINE_BLEND16(burn,       BURN(A, B), 16)

  305. DEFINE_BLEND16(softlight,  (A > 32767) ? B + (65535 - B) * (A - 32767.5) / 32767.5 * (0.5 - fabs(B - 32767.5) / 65535): B - B * ((32767.5 - A) / 32767.5) * (0.5 - fabs(B - 32767.5)/65535), 16)

  306. DEFINE_BLEND16(exclusion,  A + B - 2 * A * B / 65535, 16)

  307. DEFINE_BLEND16(pinlight,   (B < 32768) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 32768)), 16)

  308. DEFINE_BLEND16(phoenix,    FFMIN(A, B) - FFMAX(A, B) + 65535, 16)

  309. DEFINE_BLEND16(reflect,    (B == 65535) ? B : FFMIN(65535, (A * A / (65535 - B))), 16)

  310. DEFINE_BLEND16(glow,       (A == 65535) ? A : FFMIN(65535, (B * B / (65535 - A))), 16)

  311. DEFINE_BLEND16(and,        A & B, 16)

  312. DEFINE_BLEND16(or,         A | B, 16)

  313. DEFINE_BLEND16(xor,        A ^ B, 16)

  314. DEFINE_BLEND16(vividlight, (A < 32768) ? BURN(2 * A, B) : DODGE(2 * (A - 32768), B), 16)

  315. DEFINE_BLEND16(linearlight,av_clip_uint16((B < 32768) ? B + 2 * A - 65535 : B + 2 * (A - 32768)), 16)

  316. 

  317. #undef MULTIPLY

  318. #undef SCREEN

  319. #undef BURN

  320. #undef DODGE

  321. 

  322. #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 1023))

  323. #define SCREEN(x, a, b)   (1023 - (x) * ((1023 - (a)) * (1023 - (b)) / 1023))

  324. #define BURN(a, b)        (((a) == 0) ? (a) : FFMAX(0, 1023 - ((1023 - (b)) << 10) / (a)))

  325. #define DODGE(a, b)       (((a) == 1023) ? (a) : FFMIN(1023, (((b) << 10) / (1023 - (a)))))

  326. 

  327. DEFINE_BLEND16(addition,   FFMIN(1023, A + B), 10)

  328. DEFINE_BLEND16(grainmerge, (int)av_clip_uintp2(A + B - 512, 10), 10)

  329. DEFINE_BLEND16(average,    (A + B) / 2, 10)

  330. DEFINE_BLEND16(subtract,   FFMAX(0, A - B), 10)

  331. DEFINE_BLEND16(multiply,   MULTIPLY(1, A, B), 10)

  332. DEFINE_BLEND16(multiply128, (int)av_clip_uintp2((A - 512) * B / 128. + 512, 10), 10)

  333. DEFINE_BLEND16(negation,   1023 - FFABS(1023 - A - B), 10)

  334. DEFINE_BLEND16(extremity,  FFABS(1023 - A - B), 10)

  335. DEFINE_BLEND16(difference, FFABS(A - B), 10)

  336. DEFINE_BLEND16(grainextract, (int)av_clip_uintp2(512 + A - B, 10), 10)

  337. DEFINE_BLEND16(screen,     SCREEN(1, A, B), 10)

  338. DEFINE_BLEND16(overlay,    (A < 512) ? MULTIPLY(2, A, B) : SCREEN(2, A, B), 10)

  339. DEFINE_BLEND16(hardlight,  (B < 512) ? MULTIPLY(2, B, A) : SCREEN(2, B, A), 10)

  340. DEFINE_BLEND16(hardmix,    (A < (1023 - B)) ? 0: 1023, 10)

  341. DEFINE_BLEND16(heat,       (A == 0) ? 0 : 1023 - FFMIN(((1023 - B) * (1023 - B)) / A, 1023), 10)

  342. DEFINE_BLEND16(freeze,     (B == 0) ? 0 : 1023 - FFMIN(((1023 - A) * (1023 - A)) / B, 1023), 10)

  343. DEFINE_BLEND16(darken,     FFMIN(A, B), 10)

  344. DEFINE_BLEND16(lighten,    FFMAX(A, B), 10)

  345. DEFINE_BLEND16(divide,     (int)av_clip_uintp2(B == 0 ? 1023 : 1023 * A / B, 10), 10)

  346. DEFINE_BLEND16(dodge,      DODGE(A, B), 10)

  347. DEFINE_BLEND16(burn,       BURN(A, B), 10)

  348. DEFINE_BLEND16(softlight,  (A > 511) ? B + (1023 - B) * (A - 511.5) / 511.5 * (0.5 - fabs(B - 511.5) / 1023): B - B * ((511.5 - A) / 511.5) * (0.5 - fabs(B - 511.5)/1023), 10)

  349. DEFINE_BLEND16(exclusion,  A + B - 2 * A * B / 1023, 10)

  350. DEFINE_BLEND16(pinlight,   (B < 512) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 512)), 10)

  351. DEFINE_BLEND16(phoenix,    FFMIN(A, B) - FFMAX(A, B) + 1023, 10)

  352. DEFINE_BLEND16(reflect,    (B == 1023) ? B : FFMIN(1023, (A * A / (1023 - B))), 10)

  353. DEFINE_BLEND16(glow,       (A == 1023) ? A : FFMIN(1023, (B * B / (1023 - A))), 10)

  354. DEFINE_BLEND16(and,        A & B, 10)

  355. DEFINE_BLEND16(or,         A | B, 10)

  356. DEFINE_BLEND16(xor,        A ^ B, 10)

  357. DEFINE_BLEND16(vividlight, (A < 512) ? BURN(2 * A, B) : DODGE(2 * (A - 512), B), 10)

  358. DEFINE_BLEND16(linearlight,(int)av_clip_uintp2((B < 512) ? B + 2 * A - 1023 : B + 2 * (A - 512), 10), 10)

  359. 

  360. #undef MULTIPLY

  361. #undef SCREEN

  362. #undef BURN

  363. #undef DODGE

  364. 

  365. #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 4095))

  366. #define SCREEN(x, a, b)   (4095 - (x) * ((4095 - (a)) * (4095 - (b)) / 4095))

  367. #define BURN(a, b)        (((a) == 0) ? (a) : FFMAX(0, 4095 - ((4095 - (b)) << 12) / (a)))

  368. #define DODGE(a, b)       (((a) == 4095) ? (a) : FFMIN(4095, (((b) << 12) / (4095 - (a)))))

  369. 

  370. DEFINE_BLEND16(addition,   FFMIN(4095, A + B), 12)

  371. DEFINE_BLEND16(grainmerge, (int)av_clip_uintp2(A + B - 2048, 12), 12)

  372. DEFINE_BLEND16(average,    (A + B) / 2, 12)

  373. DEFINE_BLEND16(subtract,   FFMAX(0, A - B), 12)

  374. DEFINE_BLEND16(multiply,   MULTIPLY(1, A, B), 12)

  375. DEFINE_BLEND16(multiply128, (int)av_clip_uintp2((A - 2048) * B / 512. + 2048, 12), 12)

  376. DEFINE_BLEND16(negation,   4095 - FFABS(4095 - A - B), 12)

  377. DEFINE_BLEND16(extremity,  FFABS(4095 - A - B), 12)

  378. DEFINE_BLEND16(difference, FFABS(A - B), 12)

  379. DEFINE_BLEND16(grainextract, (int)av_clip_uintp2(2048 + A - B, 12), 12)

  380. DEFINE_BLEND16(screen,     SCREEN(1, A, B), 12)

  381. DEFINE_BLEND16(overlay,    (A < 2048) ? MULTIPLY(2, A, B) : SCREEN(2, A, B), 12)

  382. DEFINE_BLEND16(hardlight,  (B < 2048) ? MULTIPLY(2, B, A) : SCREEN(2, B, A), 12)

  383. DEFINE_BLEND16(hardmix,    (A < (4095 - B)) ? 0: 4095, 12)

  384. DEFINE_BLEND16(heat,       (A == 0) ? 0 : 4095 - FFMIN(((4095 - B) * (4095 - B)) / A, 4095), 12)

  385. DEFINE_BLEND16(freeze,     (B == 0) ? 0 : 4095 - FFMIN(((4095 - A) * (4095 - A)) / B, 4095), 12)

  386. DEFINE_BLEND16(darken,     FFMIN(A, B), 12)

  387. DEFINE_BLEND16(lighten,    FFMAX(A, B), 12)

  388. DEFINE_BLEND16(divide,     (int)av_clip_uintp2(B == 0 ? 4095 : 4095 * A / B, 12), 12)

  389. DEFINE_BLEND16(dodge,      DODGE(A, B), 12)

  390. DEFINE_BLEND16(burn,       BURN(A, B), 12)

  391. DEFINE_BLEND16(softlight,  (A > 2047) ? B + (4095 - B) * (A - 2047.5) / 2047.5 * (0.5 - fabs(B - 2047.5) / 4095): B - B * ((2047.5 - A) / 2047.5) * (0.5 - fabs(B - 2047.5)/4095), 12)

  392. DEFINE_BLEND16(exclusion,  A + B - 2 * A * B / 4095, 12)

  393. DEFINE_BLEND16(pinlight,   (B < 2048) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 2048)), 12)

  394. DEFINE_BLEND16(phoenix,    FFMIN(A, B) - FFMAX(A, B) + 4095, 12)

  395. DEFINE_BLEND16(reflect,    (B == 4095) ? B : FFMIN(4095, (A * A / (4095 - B))), 12)

  396. DEFINE_BLEND16(glow,       (A == 4095) ? A : FFMIN(4095, (B * B / (4095 - A))), 12)

  397. DEFINE_BLEND16(and,        A & B, 12)

  398. DEFINE_BLEND16(or,         A | B, 12)

  399. DEFINE_BLEND16(xor,        A ^ B, 12)

  400. DEFINE_BLEND16(vividlight, (A < 2048) ? BURN(2 * A, B) : DODGE(2 * (A - 2048), B), 12)

  401. DEFINE_BLEND16(linearlight,(int)av_clip_uintp2((B < 2048) ? B + 2 * A - 4095 : B + 2 * (A - 2048), 12), 12)

  402. 

  403. #define DEFINE_BLEND_EXPR(type, name, div)                                     \

  404. static void blend_expr_## name(const uint8_t *_top, ptrdiff_t top_linesize,          \

  405.                                const uint8_t *_bottom, ptrdiff_t bottom_linesize,    \

  406.                                uint8_t *_dst, ptrdiff_t dst_linesize,                \

  407.                                ptrdiff_t width, ptrdiff_t height,              \

  408.                                FilterParams *param, double *values, int starty) \

  409. {                                                                              \

  410.     const type *top = (type*)_top;                                             \

  411.     const type *bottom = (type*)_bottom;                                       \

  412.     type *dst = (type*)_dst;                                                   \

  413.     AVExpr *e = param->e;                                                      \

  414.     int y, x;                                                                  \

  415.     dst_linesize /= div;                                                       \

  416.     top_linesize /= div;                                                       \

  417.     bottom_linesize /= div;                                                    \

  418.                                                                                \

  419.     for (y = 0; y < height; y++) {                                             \

  420.         values[VAR_Y] = y + starty;                                            \

  421.         for (x = 0; x < width; x++) {                                          \

  422.             values[VAR_X]      = x;                                            \

  423.             values[VAR_TOP]    = values[VAR_A] = top[x];                       \

  424.             values[VAR_BOTTOM] = values[VAR_B] = bottom[x];                    \

  425.             dst[x] = av_expr_eval(e, values, NULL);                            \

  426.         }                                                                      \

  427.         dst    += dst_linesize;                                                \

  428.         top    += top_linesize;                                                \

  429.         bottom += bottom_linesize;                                             \

  430.     }                                                                          \

  431. }

  432. 

  433. DEFINE_BLEND_EXPR(uint8_t, 8bit, 1)

  434. DEFINE_BLEND_EXPR(uint16_t, 16bit, 2)

  435. 

  436. static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  437. {

  438.     ThreadData *td = arg;

  439.     int slice_start = (td->h *  jobnr   ) / nb_jobs;

  440.     int slice_end   = (td->h * (jobnr+1)) / nb_jobs;

  441.     int height      = slice_end - slice_start;

  442.     const uint8_t *top    = td->top->data[td->plane];

  443.     const uint8_t *bottom = td->bottom->data[td->plane];

  444.     uint8_t *dst    = td->dst->data[td->plane];

  445.     double values[VAR_VARS_NB];

  446. 

  447.     values[VAR_N]  = td->inlink->frame_count_out;

  448.     values[VAR_T]  = td->dst->pts == AV_NOPTS_VALUE ? NAN : td->dst->pts * av_q2d(td->inlink->time_base);

  449.     values[VAR_W]  = td->w;

  450.     values[VAR_H]  = td->h;

  451.     values[VAR_SW] = td->w / (double)td->dst->width;

  452.     values[VAR_SH] = td->h / (double)td->dst->height;

  453. 

  454.     td->param->blend(top + slice_start * td->top->linesize[td->plane],

  455.                      td->top->linesize[td->plane],

  456.                      bottom + slice_start * td->bottom->linesize[td->plane],

  457.                      td->bottom->linesize[td->plane],

  458.                      dst + slice_start * td->dst->linesize[td->plane],

  459.                      td->dst->linesize[td->plane],

  460.                      td->w, height, td->param, &values[0], slice_start);

  461.     return 0;

  462. }

  463. 

  464. static AVFrame *blend_frame(AVFilterContext *ctx, AVFrame *top_buf,

  465.                             const AVFrame *bottom_buf)

  466. {

  467.     BlendContext *s = ctx->priv;

  468.     AVFilterLink *inlink = ctx->inputs[0];

  469.     AVFilterLink *outlink = ctx->outputs[0];

  470.     AVFrame *dst_buf;

  471.     int plane;

  472. 

  473.     dst_buf = ff_get_video_buffer(outlink, outlink->w, outlink->h);

  474.     if (!dst_buf)

  475.         return top_buf;

  476.     av_frame_copy_props(dst_buf, top_buf);

  477. 

  478.     for (plane = 0; plane < s->nb_planes; plane++) {

  479.         int hsub = plane == 1 || plane == 2 ? s->hsub : 0;

  480.         int vsub = plane == 1 || plane == 2 ? s->vsub : 0;

  481.         int outw = AV_CEIL_RSHIFT(dst_buf->width,  hsub);

  482.         int outh = AV_CEIL_RSHIFT(dst_buf->height, vsub);

  483.         FilterParams *param = &s->params[plane];

  484.         ThreadData td = { .top = top_buf, .bottom = bottom_buf, .dst = dst_buf,

  485.                           .w = outw, .h = outh, .param = param, .plane = plane,

  486.                           .inlink = inlink };

  487. 

  488.         ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outh, ff_filter_get_nb_threads(ctx)));

  489.     }

  490. 

  491.     if (!s->tblend)

  492.         av_frame_free(&top_buf);

  493. 

  494.     return dst_buf;

  495. }

  496. 

  497. static int blend_frame_for_dualinput(FFFrameSync *fs)

  498. {

  499.     AVFilterContext *ctx = fs->parent;

  500.     AVFrame *top_buf, *bottom_buf, *dst_buf;

  501.     int ret;

  502. 

  503.     ret = ff_framesync_dualinput_get(fs, &top_buf, &bottom_buf);

  504.     if (ret < 0)

  505.         return ret;

  506.     if (!bottom_buf)

  507.         return ff_filter_frame(ctx->outputs[0], top_buf);

  508.     dst_buf = blend_frame(ctx, top_buf, bottom_buf);

  509.     return ff_filter_frame(ctx->outputs[0], dst_buf);

  510. }

  511. 

  512. static av_cold int init(AVFilterContext *ctx)

  513. {

  514.     BlendContext *s = ctx->priv;

  515. 

  516.     s->tblend = !strcmp(ctx->filter->name, "tblend");

  517. 

  518.     s->fs.on_event = blend_frame_for_dualinput;

  519.     return 0;

  520. }

  521. 

  522. static int query_formats(AVFilterContext *ctx)

  523. {

  524.     static const enum AVPixelFormat pix_fmts[] = {

  525.         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,

  526.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,

  527.         AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,

  528.         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8,

  529.         AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV440P10,

  530.         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,

  531.         AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GRAY10,

  532.         AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,

  533.         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GRAY12,

  534.         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,

  535.         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,

  536.         AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GRAY16,

  537.         AV_PIX_FMT_NONE

  538.     };

  539. 

  540.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);

  541.     if (!fmts_list)

  542.         return AVERROR(ENOMEM);

  543.     return ff_set_common_formats(ctx, fmts_list);

  544. }

  545. 

  546. static av_cold void uninit(AVFilterContext *ctx)

  547. {

  548.     BlendContext *s = ctx->priv;

  549.     int i;

  550. 

  551.     ff_framesync_uninit(&s->fs);

  552.     av_frame_free(&s->prev_frame);

  553. 

  554.     for (i = 0; i < FF_ARRAY_ELEMS(s->params); i++)

  555.         av_expr_free(s->params[i].e);

  556. }

  557. 

  558. #define DEFINE_INIT_BLEND_FUNC(depth, nbits)                                              \

  559. static av_cold void init_blend_func_##depth##_##nbits##bit(FilterParams *param)           \

  560. {                                                                                         \

  561.     switch (param->mode) {                                                                \

  562.         case BLEND_ADDITION:   param->blend = blend_addition_##depth##bit;   break;       \

  563.         case BLEND_GRAINMERGE: param->blend = blend_grainmerge_##depth##bit; break;       \

  564.         case BLEND_AND:        param->blend = blend_and_##depth##bit;        break;       \

  565.         case BLEND_AVERAGE:    param->blend = blend_average_##depth##bit;    break;       \

  566.         case BLEND_BURN:       param->blend = blend_burn_##depth##bit;       break;       \

  567.         case BLEND_DARKEN:     param->blend = blend_darken_##depth##bit;     break;       \

  568.         case BLEND_DIFFERENCE: param->blend = blend_difference_##depth##bit; break;       \

  569.         case BLEND_GRAINEXTRACT: param->blend = blend_grainextract_##depth##bit; break;   \

  570.         case BLEND_DIVIDE:     param->blend = blend_divide_##depth##bit;     break;       \

  571.         case BLEND_DODGE:      param->blend = blend_dodge_##depth##bit;      break;       \

  572.         case BLEND_EXCLUSION:  param->blend = blend_exclusion_##depth##bit;  break;       \

  573.         case BLEND_EXTREMITY:  param->blend = blend_extremity_##depth##bit;  break;       \

  574.         case BLEND_FREEZE:     param->blend = blend_freeze_##depth##bit;     break;       \

  575.         case BLEND_GLOW:       param->blend = blend_glow_##depth##bit;       break;       \

  576.         case BLEND_HARDLIGHT:  param->blend = blend_hardlight_##depth##bit;  break;       \

  577.         case BLEND_HARDMIX:    param->blend = blend_hardmix_##depth##bit;    break;       \

  578.         case BLEND_HEAT:       param->blend = blend_heat_##depth##bit;       break;       \

  579.         case BLEND_LIGHTEN:    param->blend = blend_lighten_##depth##bit;    break;       \

  580.         case BLEND_LINEARLIGHT:param->blend = blend_linearlight_##depth##bit;break;       \

  581.         case BLEND_MULTIPLY:   param->blend = blend_multiply_##depth##bit;   break;       \

  582.         case BLEND_MULTIPLY128:param->blend = blend_multiply128_##depth##bit;break;       \

  583.         case BLEND_NEGATION:   param->blend = blend_negation_##depth##bit;   break;       \

  584.         case BLEND_NORMAL:     param->blend = blend_normal_##nbits##bit;     break;       \

  585.         case BLEND_OR:         param->blend = blend_or_##depth##bit;         break;       \

  586.         case BLEND_OVERLAY:    param->blend = blend_overlay_##depth##bit;    break;       \

  587.         case BLEND_PHOENIX:    param->blend = blend_phoenix_##depth##bit;    break;       \

  588.         case BLEND_PINLIGHT:   param->blend = blend_pinlight_##depth##bit;   break;       \

  589.         case BLEND_REFLECT:    param->blend = blend_reflect_##depth##bit;    break;       \

  590.         case BLEND_SCREEN:     param->blend = blend_screen_##depth##bit;     break;       \

  591.         case BLEND_SOFTLIGHT:  param->blend = blend_softlight_##depth##bit;  break;       \

  592.         case BLEND_SUBTRACT:   param->blend = blend_subtract_##depth##bit;   break;       \

  593.         case BLEND_VIVIDLIGHT: param->blend = blend_vividlight_##depth##bit; break;       \

  594.         case BLEND_XOR:        param->blend = blend_xor_##depth##bit;        break;       \

  595.     }                                                                                     \

  596. }

  597. DEFINE_INIT_BLEND_FUNC(8, 8);

  598. DEFINE_INIT_BLEND_FUNC(10, 16);

  599. DEFINE_INIT_BLEND_FUNC(12, 16);

  600. DEFINE_INIT_BLEND_FUNC(16, 16);

  601. 

  602. void ff_blend_init(FilterParams *param, int depth)

  603. {

  604.     switch (depth) {

  605.     case 8:

  606.         init_blend_func_8_8bit(param);

  607.         break;

  608.     case 10:

  609.         init_blend_func_10_16bit(param);

  610.         break;

  611.     case 12:

  612.         init_blend_func_12_16bit(param);

  613.         break;

  614.     case 16:

  615.         init_blend_func_16_16bit(param);

  616.         break;

  617.     }

  618. 

  619.     if (param->opacity == 0 && param->mode != BLEND_NORMAL) {

  620.         param->blend = depth > 8 ? blend_copytop_16 : blend_copytop_8;

  621.     } else if (param->mode == BLEND_NORMAL) {

  622.         if (param->opacity == 1)

  623.             param->blend = depth > 8 ? blend_copytop_16 : blend_copytop_8;

  624.         else if (param->opacity == 0)

  625.             param->blend = depth > 8 ? blend_copybottom_16 : blend_copybottom_8;

  626.     }

  627. 

  628.     if (ARCH_X86)

  629.         ff_blend_init_x86(param, depth);

  630. }

  631. 

  632. static int config_output(AVFilterLink *outlink)

  633. {

  634.     AVFilterContext *ctx = outlink->src;

  635.     AVFilterLink *toplink = ctx->inputs[TOP];

  636.     BlendContext *s = ctx->priv;

  637.     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(toplink->format);

  638.     int ret, plane;

  639. 

  640.     if (!s->tblend) {

  641.         AVFilterLink *bottomlink = ctx->inputs[BOTTOM];

  642. 

  643.         if (toplink->format != bottomlink->format) {

  644.             av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");

  645.             return AVERROR(EINVAL);

  646.         }

  647.         if (toplink->w != bottomlink->w || toplink->h != bottomlink->h) {

  648.             av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "

  649.                    "(size %dx%d) do not match the corresponding "

  650.                    "second input link %s parameters (size %dx%d)\n",

  651.                    ctx->input_pads[TOP].name, toplink->w, toplink->h,

  652.                    ctx->input_pads[BOTTOM].name, bottomlink->w, bottomlink->h);

  653.             return AVERROR(EINVAL);

  654.         }

  655.     }

  656. 

  657.     outlink->w = toplink->w;

  658.     outlink->h = toplink->h;

  659.     outlink->time_base = toplink->time_base;

  660.     outlink->sample_aspect_ratio = toplink->sample_aspect_ratio;

  661.     outlink->frame_rate = toplink->frame_rate;

  662. 

  663.     s->hsub = pix_desc->log2_chroma_w;

  664.     s->vsub = pix_desc->log2_chroma_h;

  665. 

  666.     s->depth = pix_desc->comp[0].depth;

  667.     s->nb_planes = av_pix_fmt_count_planes(toplink->format);

  668. 

  669.     if (!s->tblend)

  670.         if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)

  671.             return ret;

  672. 

  673.     for (plane = 0; plane < FF_ARRAY_ELEMS(s->params); plane++) {

  674.         FilterParams *param = &s->params[plane];

  675. 

  676.         if (s->all_mode >= 0)

  677.             param->mode = s->all_mode;

  678.         if (s->all_opacity < 1)

  679.             param->opacity = s->all_opacity;

  680. 

  681.         ff_blend_init(param, s->depth);

  682. 

  683.         if (s->all_expr && !param->expr_str) {

  684.             param->expr_str = av_strdup(s->all_expr);

  685.             if (!param->expr_str)

  686.                 return AVERROR(ENOMEM);

  687.         }

  688.         if (param->expr_str) {

  689.             ret = av_expr_parse(&param->e, param->expr_str, var_names,

  690.                                 NULL, NULL, NULL, NULL, 0, ctx);

  691.             if (ret < 0)

  692.                 return ret;

  693.             param->blend = s->depth > 8 ? blend_expr_16bit : blend_expr_8bit;

  694.         }

  695.     }

  696. 

  697.     if (s->tblend)

  698.         return 0;

  699. 

  700.     ret = ff_framesync_configure(&s->fs);

  701.     outlink->time_base = s->fs.time_base;

  702. 

  703.     return ret;

  704. }

  705. 

  706. #if CONFIG_BLEND_FILTER

  707. 

  708. static int activate(AVFilterContext *ctx)

  709. {

  710.     BlendContext *s = ctx->priv;

  711.     return ff_framesync_activate(&s->fs);

  712. }

  713. 

  714. static const AVFilterPad blend_inputs[] = {

  715.     {

  716.         .name          = "top",

  717.         .type          = AVMEDIA_TYPE_VIDEO,

  718.     },{

  719.         .name          = "bottom",

  720.         .type          = AVMEDIA_TYPE_VIDEO,

  721.     },

  722.     { NULL }

  723. };

  724. 

  725. static const AVFilterPad blend_outputs[] = {

  726.     {

  727.         .name          = "default",

  728.         .type          = AVMEDIA_TYPE_VIDEO,

  729.         .config_props  = config_output,

  730.     },

  731.     { NULL }

  732. };

  733. 

  734. AVFilter ff_vf_blend = {

  735.     .name          = "blend",

  736.     .description   = NULL_IF_CONFIG_SMALL("Blend two video frames into each other."),

  737.     .preinit       = blend_framesync_preinit,

  738.     .init          = init,

  739.     .uninit        = uninit,

  740.     .priv_size     = sizeof(BlendContext),

  741.     .query_formats = query_formats,

  742.     .activate      = activate,

  743.     .inputs        = blend_inputs,

  744.     .outputs       = blend_outputs,

  745.     .priv_class    = &blend_class,

  746.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,

  747. };

  748. 

  749. #endif

  750. 

  751. #if CONFIG_TBLEND_FILTER

  752. 

  753. static int tblend_filter_frame(AVFilterLink *inlink, AVFrame *frame)

  754. {

  755.     AVFilterContext *ctx = inlink->dst;

  756.     BlendContext *s = ctx->priv;

  757.     AVFilterLink *outlink = ctx->outputs[0];

  758. 

  759.     if (s->prev_frame) {

  760.         AVFrame *out;

  761. 

  762.         if (ctx->is_disabled)

  763.             out = av_frame_clone(frame);

  764.         else

  765.             out = blend_frame(ctx, frame, s->prev_frame);

  766.         av_frame_free(&s->prev_frame);

  767.         s->prev_frame = frame;

  768.         return ff_filter_frame(outlink, out);

  769.     }

  770.     s->prev_frame = frame;

  771.     return 0;

  772. }

  773. 

  774. static const AVOption tblend_options[] = {

  775.     COMMON_OPTIONS,

  776.     { NULL }

  777. };

  778. 

  779. AVFILTER_DEFINE_CLASS(tblend);

  780. 

  781. static const AVFilterPad tblend_inputs[] = {

  782.     {

  783.         .name          = "default",

  784.         .type          = AVMEDIA_TYPE_VIDEO,

  785.         .filter_frame  = tblend_filter_frame,

  786.     },

  787.     { NULL }

  788. };

  789. 

  790. static const AVFilterPad tblend_outputs[] = {

  791.     {

  792.         .name          = "default",

  793.         .type          = AVMEDIA_TYPE_VIDEO,

  794.         .config_props  = config_output,

  795.     },

  796.     { NULL }

  797. };

  798. 

  799. AVFilter ff_vf_tblend = {

  800.     .name          = "tblend",

  801.     .description   = NULL_IF_CONFIG_SMALL("Blend successive frames."),

  802.     .priv_size     = sizeof(BlendContext),

  803.     .priv_class    = &tblend_class,

  804.     .query_formats = query_formats,

  805.     .init          = init,

  806.     .uninit        = uninit,

  807.     .inputs        = tblend_inputs,

  808.     .outputs       = tblend_outputs,

  809.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,

  810. };

  811. 

  812. #endif