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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 "bufferqueue.h"

  27. #include "formats.h"

  28. #include "internal.h"

  29. #include "dualinput.h"

  30. #include "video.h"

  31. #include "blend.h"

  32. 

  33. #define TOP    0

  34. #define BOTTOM 1

  35. 

  36. typedef struct BlendContext {

  37.     const AVClass *class;

  38.     FFDualInputContext dinput;

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

  40.     int nb_planes;

  41.     char *all_expr;

  42.     enum BlendMode all_mode;

  43.     double all_opacity;

  44. 

  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.     { "shortest",    "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },

  120.     { "repeatlast",  "repeat last bottom frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },

  121.     { NULL }

  122. };

  123. 

  124. AVFILTER_DEFINE_CLASS(blend);

  125. 

  126. #define COPY(src)                                                            \

  127. static void blend_copy ## src(const uint8_t *top, ptrdiff_t top_linesize,    \

  128.                             const uint8_t *bottom, ptrdiff_t bottom_linesize,\

  129.                             uint8_t *dst, ptrdiff_t dst_linesize,            \

  130.                             ptrdiff_t width, ptrdiff_t height,               \

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

  132. {                                                                            \

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

  134.                         width, height);                                 \

  135. }

  136. 

  137. COPY(top)

  138. COPY(bottom)

  139. 

  140. #undef COPY

  141. 

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

  143.                               const uint8_t *bottom, ptrdiff_t bottom_linesize,

  144.                               uint8_t *dst, ptrdiff_t dst_linesize,

  145.                               ptrdiff_t width, ptrdiff_t height,

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

  147. {

  148.     const double opacity = param->opacity;

  149.     int i, j;

  150. 

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

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

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

  154.         }

  155.         dst    += dst_linesize;

  156.         top    += top_linesize;

  157.         bottom += bottom_linesize;

  158.     }

  159. }

  160. 

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

  162.                                   const uint8_t *_bottom, ptrdiff_t bottom_linesize,

  163.                                   uint8_t *_dst, ptrdiff_t dst_linesize,

  164.                                   ptrdiff_t width, ptrdiff_t height,

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

  166. {

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

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

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

  170.     const double opacity = param->opacity;

  171.     int i, j;

  172.     dst_linesize /= 2;

  173.     top_linesize /= 2;

  174.     bottom_linesize /= 2;

  175. 

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

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

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

  179.         }

  180.         dst    += dst_linesize;

  181.         top    += top_linesize;

  182.         bottom += bottom_linesize;

  183.     }

  184. }

  185. 

  186. #define DEFINE_BLEND8(name, expr)                                              \

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

  188.                                  const uint8_t *bottom, ptrdiff_t bottom_linesize,   \

  189.                                  uint8_t *dst, ptrdiff_t dst_linesize,               \

  190.                                  ptrdiff_t width, ptrdiff_t height,                \

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

  192. {                                                                              \

  193.     double opacity = param->opacity;                                           \

  194.     int i, j;                                                                  \

  195.                                                                                \

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

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

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

  199.         }                                                                      \

  200.         dst    += dst_linesize;                                                \

  201.         top    += top_linesize;                                                \

  202.         bottom += bottom_linesize;                                             \

  203.     }                                                                          \

  204. }

  205. 

  206. #define DEFINE_BLEND16(name, expr)                                             \

  207. static void blend_## name##_16bit(const uint8_t *_top, ptrdiff_t top_linesize,       \

  208.                                   const uint8_t *_bottom, ptrdiff_t bottom_linesize, \

  209.                                   uint8_t *_dst, ptrdiff_t dst_linesize,             \

  210.                                   ptrdiff_t width, ptrdiff_t height,           \

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

  212. {                                                                              \

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

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

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

  216.     double opacity = param->opacity;                                           \

  217.     int i, j;                                                                  \

  218.     dst_linesize /= 2;                                                         \

  219.     top_linesize /= 2;                                                         \

  220.     bottom_linesize /= 2;                                                      \

  221.                                                                                \

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

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

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

  225.         }                                                                      \

  226.         dst    += dst_linesize;                                                \

  227.         top    += top_linesize;                                                \

  228.         bottom += bottom_linesize;                                             \

  229.     }                                                                          \

  230. }

  231. 

  232. #define A top[j]

  233. #define B bottom[j]

  234. 

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

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

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

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

  239. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  261. 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))

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

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

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

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

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

  267. DEFINE_BLEND8(and,        A & B)

  268. DEFINE_BLEND8(or,         A | B)

  269. DEFINE_BLEND8(xor,        A ^ B)

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

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

  272. 

  273. #undef MULTIPLY

  274. #undef SCREEN

  275. #undef BURN

  276. #undef DODGE

  277. 

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

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

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

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

  282. 

  283. DEFINE_BLEND16(addition,   FFMIN(65535, A + B))

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

  285. DEFINE_BLEND16(average,    (A + B) / 2)

  286. DEFINE_BLEND16(subtract,   FFMAX(0, A - B))

  287. DEFINE_BLEND16(multiply,   MULTIPLY(1, A, B))

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

  289. DEFINE_BLEND16(negation,   65535 - FFABS(65535 - A - B))

  290. DEFINE_BLEND16(extremity,  FFABS(65535 - A - B))

  291. DEFINE_BLEND16(difference, FFABS(A - B))

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

  293. DEFINE_BLEND16(screen,     SCREEN(1, A, B))

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

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

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

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

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

  299. DEFINE_BLEND16(darken,     FFMIN(A, B))

  300. DEFINE_BLEND16(lighten,    FFMAX(A, B))

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

  302. DEFINE_BLEND16(dodge,      DODGE(A, B))

  303. DEFINE_BLEND16(burn,       BURN(A, B))

  304. 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))

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

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

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

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

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

  310. DEFINE_BLEND16(and,        A & B)

  311. DEFINE_BLEND16(or,         A | B)

  312. DEFINE_BLEND16(xor,        A ^ B)

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

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

  315. 

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

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

  318.                                const uint8_t *_bottom, ptrdiff_t bottom_linesize,    \

  319.                                uint8_t *_dst, ptrdiff_t dst_linesize,                \

  320.                                ptrdiff_t width, ptrdiff_t height,              \

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

  322. {                                                                              \

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

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

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

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

  327.     int y, x;                                                                  \

  328.     dst_linesize /= div;                                                       \

  329.     top_linesize /= div;                                                       \

  330.     bottom_linesize /= div;                                                    \

  331.                                                                                \

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

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

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

  335.             values[VAR_X]      = x;                                            \

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

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

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

  339.         }                                                                      \

  340.         dst    += dst_linesize;                                                \

  341.         top    += top_linesize;                                                \

  342.         bottom += bottom_linesize;                                             \

  343.     }                                                                          \

  344. }

  345. 

  346. DEFINE_BLEND_EXPR(uint8_t, 8bit, 1)

  347. DEFINE_BLEND_EXPR(uint16_t, 16bit, 2)

  348. 

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

  350. {

  351.     ThreadData *td = arg;

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

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

  354.     int height      = slice_end - slice_start;

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

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

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

  358.     double values[VAR_VARS_NB];

  359. 

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

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

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

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

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

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

  366. 

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

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

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

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

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

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

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

  374.     return 0;

  375. }

  376. 

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

  378.                             const AVFrame *bottom_buf)

  379. {

  380.     BlendContext *s = ctx->priv;

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

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

  383.     AVFrame *dst_buf;

  384.     int plane;

  385. 

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

  387.     if (!dst_buf)

  388.         return top_buf;

  389.     av_frame_copy_props(dst_buf, top_buf);

  390. 

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

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

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

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

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

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

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

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

  399.                           .inlink = inlink };

  400. 

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

  402.     }

  403. 

  404.     if (!s->tblend)

  405.         av_frame_free(&top_buf);

  406. 

  407.     return dst_buf;

  408. }

  409. 

  410. static av_cold int init(AVFilterContext *ctx)

  411. {

  412.     BlendContext *s = ctx->priv;

  413. 

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

  415. 

  416.     s->dinput.process = blend_frame;

  417.     return 0;

  418. }

  419. 

  420. static int query_formats(AVFilterContext *ctx)

  421. {

  422.     static const enum AVPixelFormat pix_fmts[] = {

  423.         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,

  424.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,

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

  426.         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8,

  427.         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,

  428.         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,

  429.         AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GRAY16,

  430.         AV_PIX_FMT_NONE

  431.     };

  432. 

  433.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);

  434.     if (!fmts_list)

  435.         return AVERROR(ENOMEM);

  436.     return ff_set_common_formats(ctx, fmts_list);

  437. }

  438. 

  439. static av_cold void uninit(AVFilterContext *ctx)

  440. {

  441.     BlendContext *s = ctx->priv;

  442.     int i;

  443. 

  444.     ff_dualinput_uninit(&s->dinput);

  445.     av_frame_free(&s->prev_frame);

  446. 

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

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

  449. }

  450. 

  451. void ff_blend_init(FilterParams *param, int is_16bit)

  452. {

  453.     switch (param->mode) {

  454.     case BLEND_ADDITION:   param->blend = is_16bit ? blend_addition_16bit   : blend_addition_8bit;   break;

  455.     case BLEND_GRAINMERGE: param->blend = is_16bit ? blend_grainmerge_16bit : blend_grainmerge_8bit; break;

  456.     case BLEND_AND:        param->blend = is_16bit ? blend_and_16bit        : blend_and_8bit;        break;

  457.     case BLEND_AVERAGE:    param->blend = is_16bit ? blend_average_16bit    : blend_average_8bit;    break;

  458.     case BLEND_BURN:       param->blend = is_16bit ? blend_burn_16bit       : blend_burn_8bit;       break;

  459.     case BLEND_DARKEN:     param->blend = is_16bit ? blend_darken_16bit     : blend_darken_8bit;     break;

  460.     case BLEND_DIFFERENCE: param->blend = is_16bit ? blend_difference_16bit : blend_difference_8bit; break;

  461.     case BLEND_GRAINEXTRACT: param->blend = is_16bit ? blend_grainextract_16bit: blend_grainextract_8bit; break;

  462.     case BLEND_DIVIDE:     param->blend = is_16bit ? blend_divide_16bit     : blend_divide_8bit;     break;

  463.     case BLEND_DODGE:      param->blend = is_16bit ? blend_dodge_16bit      : blend_dodge_8bit;      break;

  464.     case BLEND_EXCLUSION:  param->blend = is_16bit ? blend_exclusion_16bit  : blend_exclusion_8bit;  break;

  465.     case BLEND_EXTREMITY:  param->blend = is_16bit ? blend_extremity_16bit  : blend_extremity_8bit;  break;

  466.     case BLEND_FREEZE:     param->blend = is_16bit ? blend_freeze_16bit     : blend_freeze_8bit;     break;

  467.     case BLEND_GLOW:       param->blend = is_16bit ? blend_glow_16bit       : blend_glow_8bit;       break;

  468.     case BLEND_HARDLIGHT:  param->blend = is_16bit ? blend_hardlight_16bit  : blend_hardlight_8bit;  break;

  469.     case BLEND_HARDMIX:    param->blend = is_16bit ? blend_hardmix_16bit    : blend_hardmix_8bit;    break;

  470.     case BLEND_HEAT:       param->blend = is_16bit ? blend_heat_16bit       : blend_heat_8bit;       break;

  471.     case BLEND_LIGHTEN:    param->blend = is_16bit ? blend_lighten_16bit    : blend_lighten_8bit;    break;

  472.     case BLEND_LINEARLIGHT:param->blend = is_16bit ? blend_linearlight_16bit: blend_linearlight_8bit;break;

  473.     case BLEND_MULTIPLY:   param->blend = is_16bit ? blend_multiply_16bit   : blend_multiply_8bit;   break;

  474.     case BLEND_MULTIPLY128:param->blend = is_16bit ? blend_multiply128_16bit: blend_multiply128_8bit;break;

  475.     case BLEND_NEGATION:   param->blend = is_16bit ? blend_negation_16bit   : blend_negation_8bit;   break;

  476.     case BLEND_NORMAL:     param->blend = param->opacity == 1 ? blend_copytop :

  477.                                           param->opacity == 0 ? blend_copybottom :

  478.                                           is_16bit ? blend_normal_16bit     : blend_normal_8bit;     break;

  479.     case BLEND_OR:         param->blend = is_16bit ? blend_or_16bit         : blend_or_8bit;         break;

  480.     case BLEND_OVERLAY:    param->blend = is_16bit ? blend_overlay_16bit    : blend_overlay_8bit;    break;

  481.     case BLEND_PHOENIX:    param->blend = is_16bit ? blend_phoenix_16bit    : blend_phoenix_8bit;    break;

  482.     case BLEND_PINLIGHT:   param->blend = is_16bit ? blend_pinlight_16bit   : blend_pinlight_8bit;   break;

  483.     case BLEND_REFLECT:    param->blend = is_16bit ? blend_reflect_16bit    : blend_reflect_8bit;    break;

  484.     case BLEND_SCREEN:     param->blend = is_16bit ? blend_screen_16bit     : blend_screen_8bit;     break;

  485.     case BLEND_SOFTLIGHT:  param->blend = is_16bit ? blend_softlight_16bit  : blend_softlight_8bit;  break;

  486.     case BLEND_SUBTRACT:   param->blend = is_16bit ? blend_subtract_16bit   : blend_subtract_8bit;   break;

  487.     case BLEND_VIVIDLIGHT: param->blend = is_16bit ? blend_vividlight_16bit : blend_vividlight_8bit; break;

  488.     case BLEND_XOR:        param->blend = is_16bit ? blend_xor_16bit        : blend_xor_8bit;        break;

  489.     }

  490. 

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

  492.         param->blend = blend_copytop;

  493.     }

  494. 

  495.     if (ARCH_X86)

  496.         ff_blend_init_x86(param, is_16bit);

  497. }

  498. 

  499. static int config_output(AVFilterLink *outlink)

  500. {

  501.     AVFilterContext *ctx = outlink->src;

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

  503.     BlendContext *s = ctx->priv;

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

  505.     int ret, plane, is_16bit;

  506. 

  507.     if (!s->tblend) {

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

  509. 

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

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

  512.             return AVERROR(EINVAL);

  513.         }

  514.         if (toplink->w                       != bottomlink->w ||

  515.             toplink->h                       != bottomlink->h ||

  516.             toplink->sample_aspect_ratio.num != bottomlink->sample_aspect_ratio.num ||

  517.             toplink->sample_aspect_ratio.den != bottomlink->sample_aspect_ratio.den) {

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

  519.                    "(size %dx%d, SAR %d:%d) do not match the corresponding "

  520.                    "second input link %s parameters (%dx%d, SAR %d:%d)\n",

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

  522.                    toplink->sample_aspect_ratio.num,

  523.                    toplink->sample_aspect_ratio.den,

  524.                    ctx->input_pads[BOTTOM].name, bottomlink->w, bottomlink->h,

  525.                    bottomlink->sample_aspect_ratio.num,

  526.                    bottomlink->sample_aspect_ratio.den);

  527.             return AVERROR(EINVAL);

  528.         }

  529.     }

  530. 

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

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

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

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

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

  536. 

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

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

  539. 

  540.     is_16bit = pix_desc->comp[0].depth == 16;

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

  542. 

  543.     if (!s->tblend)

  544.         if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)

  545.             return ret;

  546. 

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

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

  549. 

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

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

  552.         if (s->all_opacity < 1)

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

  554. 

  555.         ff_blend_init(param, is_16bit);

  556. 

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

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

  559.             if (!param->expr_str)

  560.                 return AVERROR(ENOMEM);

  561.         }

  562.         if (param->expr_str) {

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

  564.                                 NULL, NULL, NULL, NULL, 0, ctx);

  565.             if (ret < 0)

  566.                 return ret;

  567.             param->blend = is_16bit? blend_expr_16bit : blend_expr_8bit;

  568.         }

  569.     }

  570. 

  571.     return 0;

  572. }

  573. 

  574. #if CONFIG_BLEND_FILTER

  575. 

  576. static int request_frame(AVFilterLink *outlink)

  577. {

  578.     BlendContext *s = outlink->src->priv;

  579.     return ff_dualinput_request_frame(&s->dinput, outlink);

  580. }

  581. 

  582. static int filter_frame(AVFilterLink *inlink, AVFrame *buf)

  583. {

  584.     BlendContext *s = inlink->dst->priv;

  585.     return ff_dualinput_filter_frame(&s->dinput, inlink, buf);

  586. }

  587. 

  588. static const AVFilterPad blend_inputs[] = {

  589.     {

  590.         .name          = "top",

  591.         .type          = AVMEDIA_TYPE_VIDEO,

  592.         .filter_frame  = filter_frame,

  593.     },{

  594.         .name          = "bottom",

  595.         .type          = AVMEDIA_TYPE_VIDEO,

  596.         .filter_frame  = filter_frame,

  597.     },

  598.     { NULL }

  599. };

  600. 

  601. static const AVFilterPad blend_outputs[] = {

  602.     {

  603.         .name          = "default",

  604.         .type          = AVMEDIA_TYPE_VIDEO,

  605.         .config_props  = config_output,

  606.         .request_frame = request_frame,

  607.     },

  608.     { NULL }

  609. };

  610. 

  611. AVFilter ff_vf_blend = {

  612.     .name          = "blend",

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

  614.     .init          = init,

  615.     .uninit        = uninit,

  616.     .priv_size     = sizeof(BlendContext),

  617.     .query_formats = query_formats,

  618.     .inputs        = blend_inputs,

  619.     .outputs       = blend_outputs,

  620.     .priv_class    = &blend_class,

  621.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,

  622. };

  623. 

  624. #endif

  625. 

  626. #if CONFIG_TBLEND_FILTER

  627. 

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

  629. {

  630.     BlendContext *s = inlink->dst->priv;

  631.     AVFilterLink *outlink = inlink->dst->outputs[0];

  632. 

  633.     if (s->prev_frame) {

  634.         AVFrame *out = blend_frame(inlink->dst, frame, s->prev_frame);

  635.         av_frame_free(&s->prev_frame);

  636.         s->prev_frame = frame;

  637.         return ff_filter_frame(outlink, out);

  638.     }

  639.     s->prev_frame = frame;

  640.     return 0;

  641. }

  642. 

  643. static const AVOption tblend_options[] = {

  644.     COMMON_OPTIONS,

  645.     { NULL }

  646. };

  647. 

  648. AVFILTER_DEFINE_CLASS(tblend);

  649. 

  650. static const AVFilterPad tblend_inputs[] = {

  651.     {

  652.         .name          = "default",

  653.         .type          = AVMEDIA_TYPE_VIDEO,

  654.         .filter_frame  = tblend_filter_frame,

  655.     },

  656.     { NULL }

  657. };

  658. 

  659. static const AVFilterPad tblend_outputs[] = {

  660.     {

  661.         .name          = "default",

  662.         .type          = AVMEDIA_TYPE_VIDEO,

  663.         .config_props  = config_output,

  664.     },

  665.     { NULL }

  666. };

  667. 

  668. AVFilter ff_vf_tblend = {

  669.     .name          = "tblend",

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

  671.     .priv_size     = sizeof(BlendContext),

  672.     .priv_class    = &tblend_class,

  673.     .query_formats = query_formats,

  674.     .init          = init,

  675.     .uninit        = uninit,

  676.     .inputs        = tblend_inputs,

  677.     .outputs       = tblend_outputs,

  678.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  679. };

  680. 

  681. #endif