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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_ADDITION128}, 0, 0, FLAGS, "mode" },\

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

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

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

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

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

  75.     { "difference128", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE128}, 0, 0, FLAGS, "mode" },\

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  108. 

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

  110. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  111. 

  112. static const AVOption blend_options[] = {

  113.     COMMON_OPTIONS,

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

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

  116.     { NULL }

  117. };

  118. 

  119. AVFILTER_DEFINE_CLASS(blend);

  120. 

  121. #define COPY(src)                                                            \

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

  123.                             const uint8_t *bottom, ptrdiff_t bottom_linesize,\

  124.                             uint8_t *dst, ptrdiff_t dst_linesize,            \

  125.                             ptrdiff_t width, ptrdiff_t height,               \

  126.                             FilterParams *param, double *values)             \

  127. {                                                                            \

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

  129.                         width, height);                                 \

  130. }

  131. 

  132. COPY(top)

  133. COPY(bottom)

  134. 

  135. #undef COPY

  136. 

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

  138.                               const uint8_t *bottom, ptrdiff_t bottom_linesize,

  139.                               uint8_t *dst, ptrdiff_t dst_linesize,

  140.                               ptrdiff_t width, ptrdiff_t height,

  141.                               FilterParams *param, double *values)

  142. {

  143.     const double opacity = param->opacity;

  144.     int i, j;

  145. 

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

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

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

  149.         }

  150.         dst    += dst_linesize;

  151.         top    += top_linesize;

  152.         bottom += bottom_linesize;

  153.     }

  154. }

  155. 

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

  157.                                   const uint8_t *_bottom, ptrdiff_t bottom_linesize,

  158.                                   uint8_t *_dst, ptrdiff_t dst_linesize,

  159.                                   ptrdiff_t width, ptrdiff_t height,

  160.                                   FilterParams *param, double *values)

  161. {

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

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

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

  165.     const double opacity = param->opacity;

  166.     int i, j;

  167.     dst_linesize /= 2;

  168.     top_linesize /= 2;

  169.     bottom_linesize /= 2;

  170. 

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

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

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

  174.         }

  175.         dst    += dst_linesize;

  176.         top    += top_linesize;

  177.         bottom += bottom_linesize;

  178.     }

  179. }

  180. 

  181. #define DEFINE_BLEND8(name, expr)                                              \

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

  183.                                  const uint8_t *bottom, ptrdiff_t bottom_linesize,   \

  184.                                  uint8_t *dst, ptrdiff_t dst_linesize,               \

  185.                                  ptrdiff_t width, ptrdiff_t height,                \

  186.                                  FilterParams *param, double *values)          \

  187. {                                                                              \

  188.     double opacity = param->opacity;                                           \

  189.     int i, j;                                                                  \

  190.                                                                                \

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

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

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

  194.         }                                                                      \

  195.         dst    += dst_linesize;                                                \

  196.         top    += top_linesize;                                                \

  197.         bottom += bottom_linesize;                                             \

  198.     }                                                                          \

  199. }

  200. 

  201. #define DEFINE_BLEND16(name, expr)                                             \

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

  203.                                   const uint8_t *_bottom, ptrdiff_t bottom_linesize, \

  204.                                   uint8_t *_dst, ptrdiff_t dst_linesize,             \

  205.                                   ptrdiff_t width, ptrdiff_t height,           \

  206.                                   FilterParams *param, double *values)         \

  207. {                                                                              \

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

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

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

  211.     double opacity = param->opacity;                                           \

  212.     int i, j;                                                                  \

  213.     dst_linesize /= 2;                                                         \

  214.     top_linesize /= 2;                                                         \

  215.     bottom_linesize /= 2;                                                      \

  216.                                                                                \

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

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

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

  220.         }                                                                      \

  221.         dst    += dst_linesize;                                                \

  222.         top    += top_linesize;                                                \

  223.         bottom += bottom_linesize;                                             \

  224.     }                                                                          \

  225. }

  226. 

  227. #define A top[j]

  228. #define B bottom[j]

  229. 

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

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

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

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

  234. 

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

  236. DEFINE_BLEND8(addition128, av_clip_uint8(A + B - 128))

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

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

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

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

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

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

  243. DEFINE_BLEND8(difference128, av_clip_uint8(128 + A - B))

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

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

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

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

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

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

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

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

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

  253. 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))

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

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

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

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

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

  259. DEFINE_BLEND8(and,        A & B)

  260. DEFINE_BLEND8(or,         A | B)

  261. DEFINE_BLEND8(xor,        A ^ B)

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

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

  264. 

  265. #undef MULTIPLY

  266. #undef SCREEN

  267. #undef BURN

  268. #undef DODGE

  269. 

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

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

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

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

  274. 

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

  276. DEFINE_BLEND16(addition128, av_clip_uint16(A + B - 32768))

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

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

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

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

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

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

  283. DEFINE_BLEND16(difference128, av_clip_uint16(32768 + A - B))

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

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

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

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

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

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

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

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

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

  293. 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))

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

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

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

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

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

  299. DEFINE_BLEND16(and,        A & B)

  300. DEFINE_BLEND16(or,         A | B)

  301. DEFINE_BLEND16(xor,        A ^ B)

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

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

  304. 

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

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

  307.                                const uint8_t *_bottom, ptrdiff_t bottom_linesize,    \

  308.                                uint8_t *_dst, ptrdiff_t dst_linesize,                \

  309.                                ptrdiff_t width, ptrdiff_t height,              \

  310.                                FilterParams *param, double *values)            \

  311. {                                                                              \

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

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

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

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

  316.     int y, x;                                                                  \

  317.     dst_linesize /= div;                                                       \

  318.     top_linesize /= div;                                                       \

  319.     bottom_linesize /= div;                                                    \

  320.                                                                                \

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

  322.         values[VAR_Y] = y;                                                     \

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

  324.             values[VAR_X]      = x;                                            \

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

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

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

  328.         }                                                                      \

  329.         dst    += dst_linesize;                                                \

  330.         top    += top_linesize;                                                \

  331.         bottom += bottom_linesize;                                             \

  332.     }                                                                          \

  333. }

  334. 

  335. DEFINE_BLEND_EXPR(uint8_t, 8bit, 1)

  336. DEFINE_BLEND_EXPR(uint16_t, 16bit, 2)

  337. 

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

  339. {

  340.     ThreadData *td = arg;

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

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

  343.     int height      = slice_end - slice_start;

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

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

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

  347.     double values[VAR_VARS_NB];

  348. 

  349.     values[VAR_N]  = td->inlink->frame_count;

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

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

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

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

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

  355. 

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

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

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

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

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

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

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

  363.     return 0;

  364. }

  365. 

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

  367.                             const AVFrame *bottom_buf)

  368. {

  369.     BlendContext *s = ctx->priv;

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

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

  372.     AVFrame *dst_buf;

  373.     int plane;

  374. 

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

  376.     if (!dst_buf)

  377.         return top_buf;

  378.     av_frame_copy_props(dst_buf, top_buf);

  379. 

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

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

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

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

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

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

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

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

  388.                           .inlink = inlink };

  389. 

  390.         ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outh, ctx->graph->nb_threads));

  391.     }

  392. 

  393.     if (!s->tblend)

  394.         av_frame_free(&top_buf);

  395. 

  396.     return dst_buf;

  397. }

  398. 

  399. static av_cold int init(AVFilterContext *ctx)

  400. {

  401.     BlendContext *s = ctx->priv;

  402. 

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

  404. 

  405.     s->dinput.process = blend_frame;

  406.     return 0;

  407. }

  408. 

  409. static int query_formats(AVFilterContext *ctx)

  410. {

  411.     static const enum AVPixelFormat pix_fmts[] = {

  412.         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,

  413.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,

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

  415.         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8,

  416.         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,

  417.         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,

  418.         AV_PIX_FMT_GBRP16, AV_PIX_FMT_GRAY16,

  419.         AV_PIX_FMT_NONE

  420.     };

  421. 

  422.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);

  423.     if (!fmts_list)

  424.         return AVERROR(ENOMEM);

  425.     return ff_set_common_formats(ctx, fmts_list);

  426. }

  427. 

  428. static av_cold void uninit(AVFilterContext *ctx)

  429. {

  430.     BlendContext *s = ctx->priv;

  431.     int i;

  432. 

  433.     ff_dualinput_uninit(&s->dinput);

  434.     av_frame_free(&s->prev_frame);

  435. 

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

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

  438. }

  439. 

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

  441. {

  442.     switch (param->mode) {

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

  444.     case BLEND_ADDITION128: param->blend = is_16bit ? blend_addition128_16bit : blend_addition128_8bit; break;

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

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

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

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

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

  450.     case BLEND_DIFFERENCE128: param->blend = is_16bit ? blend_difference128_16bit: blend_difference128_8bit; break;

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

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

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

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

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

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

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

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

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

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

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

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

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

  464.                                           is_16bit ? blend_normal_16bit     : blend_normal_8bit;     break;

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

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

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

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

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

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

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

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

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

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

  475.     }

  476. 

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

  478.         param->blend = blend_copytop;

  479.     }

  480. 

  481.     if (ARCH_X86)

  482.         ff_blend_init_x86(param, is_16bit);

  483. }

  484. 

  485. static int config_output(AVFilterLink *outlink)

  486. {

  487.     AVFilterContext *ctx = outlink->src;

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

  489.     BlendContext *s = ctx->priv;

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

  491.     int ret, plane, is_16bit;

  492. 

  493.     if (!s->tblend) {

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

  495. 

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

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

  498.             return AVERROR(EINVAL);

  499.         }

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

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

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

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

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

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

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

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

  508.                    toplink->sample_aspect_ratio.num,

  509.                    toplink->sample_aspect_ratio.den,

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

  511.                    bottomlink->sample_aspect_ratio.num,

  512.                    bottomlink->sample_aspect_ratio.den);

  513.             return AVERROR(EINVAL);

  514.         }

  515.     }

  516. 

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

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

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

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

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

  522. 

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

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

  525. 

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

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

  528. 

  529.     if (!s->tblend)

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

  531.             return ret;

  532. 

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

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

  535. 

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

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

  538.         if (s->all_opacity < 1)

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

  540. 

  541.         ff_blend_init(param, is_16bit);

  542. 

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

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

  545.             if (!param->expr_str)

  546.                 return AVERROR(ENOMEM);

  547.         }

  548.         if (param->expr_str) {

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

  550.                                 NULL, NULL, NULL, NULL, 0, ctx);

  551.             if (ret < 0)

  552.                 return ret;

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

  554.         }

  555.     }

  556. 

  557.     return 0;

  558. }

  559. 

  560. #if CONFIG_BLEND_FILTER

  561. 

  562. static int request_frame(AVFilterLink *outlink)

  563. {

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

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

  566. }

  567. 

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

  569. {

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

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

  572. }

  573. 

  574. static const AVFilterPad blend_inputs[] = {

  575.     {

  576.         .name          = "top",

  577.         .type          = AVMEDIA_TYPE_VIDEO,

  578.         .filter_frame  = filter_frame,

  579.     },{

  580.         .name          = "bottom",

  581.         .type          = AVMEDIA_TYPE_VIDEO,

  582.         .filter_frame  = filter_frame,

  583.     },

  584.     { NULL }

  585. };

  586. 

  587. static const AVFilterPad blend_outputs[] = {

  588.     {

  589.         .name          = "default",

  590.         .type          = AVMEDIA_TYPE_VIDEO,

  591.         .config_props  = config_output,

  592.         .request_frame = request_frame,

  593.     },

  594.     { NULL }

  595. };

  596. 

  597. AVFilter ff_vf_blend = {

  598.     .name          = "blend",

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

  600.     .init          = init,

  601.     .uninit        = uninit,

  602.     .priv_size     = sizeof(BlendContext),

  603.     .query_formats = query_formats,

  604.     .inputs        = blend_inputs,

  605.     .outputs       = blend_outputs,

  606.     .priv_class    = &blend_class,

  607.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,

  608. };

  609. 

  610. #endif

  611. 

  612. #if CONFIG_TBLEND_FILTER

  613. 

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

  615. {

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

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

  618. 

  619.     if (s->prev_frame) {

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

  621.         av_frame_free(&s->prev_frame);

  622.         s->prev_frame = frame;

  623.         return ff_filter_frame(outlink, out);

  624.     }

  625.     s->prev_frame = frame;

  626.     return 0;

  627. }

  628. 

  629. static const AVOption tblend_options[] = {

  630.     COMMON_OPTIONS,

  631.     { NULL }

  632. };

  633. 

  634. AVFILTER_DEFINE_CLASS(tblend);

  635. 

  636. static const AVFilterPad tblend_inputs[] = {

  637.     {

  638.         .name          = "default",

  639.         .type          = AVMEDIA_TYPE_VIDEO,

  640.         .filter_frame  = tblend_filter_frame,

  641.     },

  642.     { NULL }

  643. };

  644. 

  645. static const AVFilterPad tblend_outputs[] = {

  646.     {

  647.         .name          = "default",

  648.         .type          = AVMEDIA_TYPE_VIDEO,

  649.         .config_props  = config_output,

  650.     },

  651.     { NULL }

  652. };

  653. 

  654. AVFilter ff_vf_tblend = {

  655.     .name          = "tblend",

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

  657.     .priv_size     = sizeof(BlendContext),

  658.     .priv_class    = &tblend_class,

  659.     .query_formats = query_formats,

  660.     .init          = init,

  661.     .uninit        = uninit,

  662.     .inputs        = tblend_inputs,

  663.     .outputs       = tblend_outputs,

  664.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  665. };

  666. 

  667. #endif