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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. 

  32. #define TOP    0

  33. #define BOTTOM 1

  34. 

  35. enum BlendMode {

  36.     BLEND_UNSET = -1,

  37.     BLEND_NORMAL,

  38.     BLEND_ADDITION,

  39.     BLEND_AND,

  40.     BLEND_AVERAGE,

  41.     BLEND_BURN,

  42.     BLEND_DARKEN,

  43.     BLEND_DIFFERENCE,

  44.     BLEND_DIFFERENCE128,

  45.     BLEND_DIVIDE,

  46.     BLEND_DODGE,

  47.     BLEND_EXCLUSION,

  48.     BLEND_HARDLIGHT,

  49.     BLEND_LIGHTEN,

  50.     BLEND_MULTIPLY,

  51.     BLEND_NEGATION,

  52.     BLEND_OR,

  53.     BLEND_OVERLAY,

  54.     BLEND_PHOENIX,

  55.     BLEND_PINLIGHT,

  56.     BLEND_REFLECT,

  57.     BLEND_SCREEN,

  58.     BLEND_SOFTLIGHT,

  59.     BLEND_SUBTRACT,

  60.     BLEND_VIVIDLIGHT,

  61.     BLEND_XOR,

  62.     BLEND_HARDMIX,

  63.     BLEND_LINEARLIGHT,

  64.     BLEND_GLOW,

  65.     BLEND_NB

  66. };

  67. 

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

  69. 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 };

  70. 

  71. typedef struct FilterParams {

  72.     enum BlendMode mode;

  73.     double opacity;

  74.     AVExpr *e;

  75.     char *expr_str;

  76.     void (*blend)(const uint8_t *top, int top_linesize,

  77.                   const uint8_t *bottom, int bottom_linesize,

  78.                   uint8_t *dst, int dst_linesize,

  79.                   int width, int start, int end,

  80.                   struct FilterParams *param, double *values);

  81. } FilterParams;

  82. 

  83. typedef struct ThreadData {

  84.     const AVFrame *top, *bottom;

  85.     AVFrame *dst;

  86.     AVFilterLink *inlink;

  87.     int plane;

  88.     int w, h;

  89.     FilterParams *param;

  90. } ThreadData;

  91. 

  92. typedef struct {

  93.     const AVClass *class;

  94.     FFDualInputContext dinput;

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

  96.     int nb_planes;

  97.     char *all_expr;

  98.     enum BlendMode all_mode;

  99.     double all_opacity;

  100. 

  101.     FilterParams params[4];

  102.     int tblend;

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

  104. } BlendContext;

  105. 

  106. #define COMMON_OPTIONS \

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  150. 

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

  152. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  153. 

  154. static const AVOption blend_options[] = {

  155.     COMMON_OPTIONS,

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

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

  158.     { NULL }

  159. };

  160. 

  161. AVFILTER_DEFINE_CLASS(blend);

  162. 

  163. static void blend_normal(const uint8_t *top, int top_linesize,

  164.                          const uint8_t *bottom, int bottom_linesize,

  165.                          uint8_t *dst, int dst_linesize,

  166.                          int width, int start, int end,

  167.                          FilterParams *param, double *values)

  168. {

  169.     av_image_copy_plane(dst, dst_linesize, top, top_linesize, width, end - start);

  170. }

  171. 

  172. #define DEFINE_BLEND8(name, expr)                                              \

  173. static void blend_## name##_8bit(const uint8_t *top, int top_linesize,         \

  174.                                  const uint8_t *bottom, int bottom_linesize,   \

  175.                                  uint8_t *dst, int dst_linesize,               \

  176.                                  int width, int start, int end,                \

  177.                                  FilterParams *param, double *values)          \

  178. {                                                                              \

  179.     double opacity = param->opacity;                                           \

  180.     int i, j;                                                                  \

  181.                                                                                \

  182.     for (i = start; i < end; i++) {                                            \

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

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

  185.         }                                                                      \

  186.         dst    += dst_linesize;                                                \

  187.         top    += top_linesize;                                                \

  188.         bottom += bottom_linesize;                                             \

  189.     }                                                                          \

  190. }

  191. 

  192. #define DEFINE_BLEND16(name, expr)                                             \

  193. static void blend_## name##_16bit(const uint8_t *_top, int top_linesize,       \

  194.                                   const uint8_t *_bottom, int bottom_linesize, \

  195.                                   uint8_t *_dst, int dst_linesize,             \

  196.                                   int width, int start, int end,               \

  197.                                   FilterParams *param, double *values)         \

  198. {                                                                              \

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

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

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

  202.     double opacity = param->opacity;                                           \

  203.     int i, j;                                                                  \

  204.     dst_linesize /= 2;                                                         \

  205.     top_linesize /= 2;                                                         \

  206.     bottom_linesize /= 2;                                                      \

  207.                                                                                \

  208.     for (i = start; i < end; i++) {                                            \

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

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

  211.         }                                                                      \

  212.         dst    += dst_linesize;                                                \

  213.         top    += top_linesize;                                                \

  214.         bottom += bottom_linesize;                                             \

  215.     }                                                                          \

  216. }

  217. 

  218. #define A top[j]

  219. #define B bottom[j]

  220. 

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

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

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

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

  225. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  239. DEFINE_BLEND8(divide,     av_clip_uint8(((float)A / ((float)B) * 255)))

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

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

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

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

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

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

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

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

  248. DEFINE_BLEND8(and,        A & B)

  249. DEFINE_BLEND8(or,         A | B)

  250. DEFINE_BLEND8(xor,        A ^ B)

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

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

  253. 

  254. #undef MULTIPLY

  255. #undef SCREEN

  256. #undef BURN

  257. #undef DODGE

  258. 

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

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

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

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

  263. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  277. DEFINE_BLEND16(divide,     av_clip_uint16(((float)A / ((float)B) * 65535)))

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

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

  280. DEFINE_BLEND16(softlight,  (A > 32767) ? B + (65535 - B) * (A - 32767.5) / 32767.5 * (0.5 - FFABS(B - 32767.5) / 65535): B - B * ((32767.5 - A) / 32767.5) * (0.5 - FFABS(B - 32767.5)/65535))

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

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

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

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

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

  286. DEFINE_BLEND16(and,        A & B)

  287. DEFINE_BLEND16(or,         A | B)

  288. DEFINE_BLEND16(xor,        A ^ B)

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

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

  291. 

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

  293. static void blend_expr_## name(const uint8_t *_top, int top_linesize,          \

  294.                                const uint8_t *_bottom, int bottom_linesize,    \

  295.                                uint8_t *_dst, int dst_linesize,                \

  296.                                int width, int start, int end,                  \

  297.                                FilterParams *param, double *values)            \

  298. {                                                                              \

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

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

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

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

  303.     int y, x;                                                                  \

  304.     dst_linesize /= div;                                                       \

  305.     top_linesize /= div;                                                       \

  306.     bottom_linesize /= div;                                                    \

  307.                                                                                \

  308.     for (y = start; y < end; y++) {                                            \

  309.         values[VAR_Y] = y;                                                     \

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

  311.             values[VAR_X]      = x;                                            \

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

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

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

  315.         }                                                                      \

  316.         dst    += dst_linesize;                                                \

  317.         top    += top_linesize;                                                \

  318.         bottom += bottom_linesize;                                             \

  319.     }                                                                          \

  320. }

  321. 

  322. DEFINE_BLEND_EXPR(uint8_t, 8bit, 1)

  323. DEFINE_BLEND_EXPR(uint16_t, 16bit, 2)

  324. 

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

  326. {

  327.     ThreadData *td = arg;

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

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

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

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

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

  333.     double values[VAR_VARS_NB];

  334. 

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

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

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

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

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

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

  341. 

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

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

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

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

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

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

  348.                      td->w, slice_start, slice_end, td->param, &values[0]);

  349.     return 0;

  350. }

  351. 

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

  353.                             const AVFrame *bottom_buf)

  354. {

  355.     BlendContext *s = ctx->priv;

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

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

  358.     AVFrame *dst_buf;

  359.     int plane;

  360. 

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

  362.     if (!dst_buf)

  363.         return top_buf;

  364.     av_frame_copy_props(dst_buf, top_buf);

  365. 

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

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

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

  369.         int outw = FF_CEIL_RSHIFT(dst_buf->width,  hsub);

  370.         int outh = FF_CEIL_RSHIFT(dst_buf->height, vsub);

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

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

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

  374.                           .inlink = inlink };

  375. 

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

  377.     }

  378. 

  379.     if (!s->tblend)

  380.         av_frame_free(&top_buf);

  381. 

  382.     return dst_buf;

  383. }

  384. 

  385. static av_cold int init(AVFilterContext *ctx)

  386. {

  387.     BlendContext *s = ctx->priv;

  388. 

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

  390. 

  391.     s->dinput.process = blend_frame;

  392.     return 0;

  393. }

  394. 

  395. static int query_formats(AVFilterContext *ctx)

  396. {

  397.     static const enum AVPixelFormat pix_fmts[] = {

  398.         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,

  399.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,

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

  401.         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8,

  402.         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,

  403.         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,

  404.         AV_PIX_FMT_GBRP16, AV_PIX_FMT_GRAY16,

  405.         AV_PIX_FMT_NONE

  406.     };

  407. 

  408.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);

  409.     if (!fmts_list)

  410.         return AVERROR(ENOMEM);

  411.     return ff_set_common_formats(ctx, fmts_list);

  412. }

  413. 

  414. static av_cold void uninit(AVFilterContext *ctx)

  415. {

  416.     BlendContext *s = ctx->priv;

  417.     int i;

  418. 

  419.     ff_dualinput_uninit(&s->dinput);

  420.     av_frame_free(&s->prev_frame);

  421. 

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

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

  424. }

  425. 

  426. static int config_output(AVFilterLink *outlink)

  427. {

  428.     AVFilterContext *ctx = outlink->src;

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

  430.     BlendContext *s = ctx->priv;

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

  432.     int ret, plane, is_16bit;

  433. 

  434.     if (!s->tblend) {

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

  436. 

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

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

  439.             return AVERROR(EINVAL);

  440.         }

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

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

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

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

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

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

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

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

  449.                    toplink->sample_aspect_ratio.num,

  450.                    toplink->sample_aspect_ratio.den,

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

  452.                    bottomlink->sample_aspect_ratio.num,

  453.                    bottomlink->sample_aspect_ratio.den);

  454.             return AVERROR(EINVAL);

  455.         }

  456.     }

  457. 

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

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

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

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

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

  463. 

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

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

  466. 

  467.     is_16bit = pix_desc->comp[0].depth_minus1 == 15;

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

  469. 

  470.     if (s->tblend)

  471.         outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

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

  473.             return ret;

  474. 

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

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

  477. 

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

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

  480.         if (s->all_opacity < 1)

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

  482. 

  483.         switch (param->mode) {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  501.         case BLEND_NORMAL:     param->blend = blend_normal;                                              break;

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

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

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

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

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

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

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

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

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

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

  512.         }

  513. 

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

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

  516.             if (!param->expr_str)

  517.                 return AVERROR(ENOMEM);

  518.         }

  519.         if (param->expr_str) {

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

  521.                                 NULL, NULL, NULL, NULL, 0, ctx);

  522.             if (ret < 0)

  523.                 return ret;

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

  525.         }

  526.     }

  527. 

  528.     return 0;

  529. }

  530. 

  531. #if CONFIG_BLEND_FILTER

  532. 

  533. static int request_frame(AVFilterLink *outlink)

  534. {

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

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

  537. }

  538. 

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

  540. {

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

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

  543. }

  544. 

  545. static const AVFilterPad blend_inputs[] = {

  546.     {

  547.         .name          = "top",

  548.         .type          = AVMEDIA_TYPE_VIDEO,

  549.         .filter_frame  = filter_frame,

  550.     },{

  551.         .name          = "bottom",

  552.         .type          = AVMEDIA_TYPE_VIDEO,

  553.         .filter_frame  = filter_frame,

  554.     },

  555.     { NULL }

  556. };

  557. 

  558. static const AVFilterPad blend_outputs[] = {

  559.     {

  560.         .name          = "default",

  561.         .type          = AVMEDIA_TYPE_VIDEO,

  562.         .config_props  = config_output,

  563.         .request_frame = request_frame,

  564.     },

  565.     { NULL }

  566. };

  567. 

  568. AVFilter ff_vf_blend = {

  569.     .name          = "blend",

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

  571.     .init          = init,

  572.     .uninit        = uninit,

  573.     .priv_size     = sizeof(BlendContext),

  574.     .query_formats = query_formats,

  575.     .inputs        = blend_inputs,

  576.     .outputs       = blend_outputs,

  577.     .priv_class    = &blend_class,

  578.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,

  579. };

  580. 

  581. #endif

  582. 

  583. #if CONFIG_TBLEND_FILTER

  584. 

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

  586. {

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

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

  589. 

  590.     if (s->prev_frame) {

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

  592.         av_frame_free(&s->prev_frame);

  593.         s->prev_frame = frame;

  594.         return ff_filter_frame(outlink, out);

  595.     }

  596.     s->prev_frame = frame;

  597.     return 0;

  598. }

  599. 

  600. static const AVOption tblend_options[] = {

  601.     COMMON_OPTIONS,

  602.     { NULL }

  603. };

  604. 

  605. AVFILTER_DEFINE_CLASS(tblend);

  606. 

  607. static const AVFilterPad tblend_inputs[] = {

  608.     {

  609.         .name          = "default",

  610.         .type          = AVMEDIA_TYPE_VIDEO,

  611.         .filter_frame  = tblend_filter_frame,

  612.     },

  613.     { NULL }

  614. };

  615. 

  616. static const AVFilterPad tblend_outputs[] = {

  617.     {

  618.         .name          = "default",

  619.         .type          = AVMEDIA_TYPE_VIDEO,

  620.         .config_props  = config_output,

  621.     },

  622.     { NULL }

  623. };

  624. 

  625. AVFilter ff_vf_tblend = {

  626.     .name          = "tblend",

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

  628.     .priv_size     = sizeof(BlendContext),

  629.     .priv_class    = &tblend_class,

  630.     .query_formats = query_formats,

  631.     .init          = init,

  632.     .uninit        = uninit,

  633.     .inputs        = tblend_inputs,

  634.     .outputs       = tblend_outputs,

  635.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  636. };

  637. 

  638. #endif