| 1 | /* |
| 2 | * Copyright (c) 2013 Stefano Sabatini |
| 3 | * Copyright (c) 2008 Vitor Sessak |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * rotation filter, partially based on the tests/rotozoom.c program |
| 25 | */ |
| 26 | |
| 27 | #include "libavutil/avstring.h" |
| 28 | #include "libavutil/eval.h" |
| 29 | #include "libavutil/opt.h" |
| 30 | #include "libavutil/intreadwrite.h" |
| 31 | #include "libavutil/parseutils.h" |
| 32 | #include "libavutil/pixdesc.h" |
| 33 | |
| 34 | #include "avfilter.h" |
| 35 | #include "drawutils.h" |
| 36 | #include "internal.h" |
| 37 | #include "video.h" |
| 38 | |
| 39 | #include <float.h> |
| 40 | |
| 41 | static const char * const var_names[] = { |
| 42 | "in_w" , "iw", ///< width of the input video |
| 43 | "in_h" , "ih", ///< height of the input video |
| 44 | "out_w", "ow", ///< width of the input video |
| 45 | "out_h", "oh", ///< height of the input video |
| 46 | "hsub", "vsub", |
| 47 | "n", ///< number of frame |
| 48 | "t", ///< timestamp expressed in seconds |
| 49 | NULL |
| 50 | }; |
| 51 | |
| 52 | enum var_name { |
| 53 | VAR_IN_W , VAR_IW, |
| 54 | VAR_IN_H , VAR_IH, |
| 55 | VAR_OUT_W, VAR_OW, |
| 56 | VAR_OUT_H, VAR_OH, |
| 57 | VAR_HSUB, VAR_VSUB, |
| 58 | VAR_N, |
| 59 | VAR_T, |
| 60 | VAR_VARS_NB |
| 61 | }; |
| 62 | |
| 63 | typedef struct { |
| 64 | const AVClass *class; |
| 65 | double angle; |
| 66 | char *angle_expr_str; ///< expression for the angle |
| 67 | AVExpr *angle_expr; ///< parsed expression for the angle |
| 68 | char *outw_expr_str, *outh_expr_str; |
| 69 | int outh, outw; |
| 70 | uint8_t fillcolor[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area |
| 71 | char *fillcolor_str; |
| 72 | int fillcolor_enable; |
| 73 | int hsub, vsub; |
| 74 | int nb_planes; |
| 75 | int use_bilinear; |
| 76 | float sinx, cosx; |
| 77 | double var_values[VAR_VARS_NB]; |
| 78 | FFDrawContext draw; |
| 79 | FFDrawColor color; |
| 80 | } RotContext; |
| 81 | |
| 82 | typedef struct ThreadData { |
| 83 | AVFrame *in, *out; |
| 84 | int inw, inh; |
| 85 | int outw, outh; |
| 86 | int plane; |
| 87 | int xi, yi; |
| 88 | int xprime, yprime; |
| 89 | int c, s; |
| 90 | } ThreadData; |
| 91 | |
| 92 | #define OFFSET(x) offsetof(RotContext, x) |
| 93 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 94 | |
| 95 | static const AVOption rotate_options[] = { |
| 96 | { "angle", "set angle (in radians)", OFFSET(angle_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS }, |
| 97 | { "a", "set angle (in radians)", OFFSET(angle_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS }, |
| 98 | { "out_w", "set output width expression", OFFSET(outw_expr_str), AV_OPT_TYPE_STRING, {.str="iw"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS }, |
| 99 | { "ow", "set output width expression", OFFSET(outw_expr_str), AV_OPT_TYPE_STRING, {.str="iw"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS }, |
| 100 | { "out_h", "set output height expression", OFFSET(outh_expr_str), AV_OPT_TYPE_STRING, {.str="ih"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS }, |
| 101 | { "oh", "set output height expression", OFFSET(outh_expr_str), AV_OPT_TYPE_STRING, {.str="ih"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS }, |
| 102 | { "fillcolor", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS }, |
| 103 | { "c", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, .flags=FLAGS }, |
| 104 | { "bilinear", "use bilinear interpolation", OFFSET(use_bilinear), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, .flags=FLAGS }, |
| 105 | { NULL } |
| 106 | }; |
| 107 | |
| 108 | AVFILTER_DEFINE_CLASS(rotate); |
| 109 | |
| 110 | static av_cold int init(AVFilterContext *ctx) |
| 111 | { |
| 112 | RotContext *rot = ctx->priv; |
| 113 | |
| 114 | if (!strcmp(rot->fillcolor_str, "none")) |
| 115 | rot->fillcolor_enable = 0; |
| 116 | else if (av_parse_color(rot->fillcolor, rot->fillcolor_str, -1, ctx) >= 0) |
| 117 | rot->fillcolor_enable = 1; |
| 118 | else |
| 119 | return AVERROR(EINVAL); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static av_cold void uninit(AVFilterContext *ctx) |
| 124 | { |
| 125 | RotContext *rot = ctx->priv; |
| 126 | |
| 127 | av_expr_free(rot->angle_expr); |
| 128 | rot->angle_expr = NULL; |
| 129 | } |
| 130 | |
| 131 | static int query_formats(AVFilterContext *ctx) |
| 132 | { |
| 133 | static const enum PixelFormat pix_fmts[] = { |
| 134 | AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, |
| 135 | AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, |
| 136 | AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, |
| 137 | AV_PIX_FMT_0RGB, AV_PIX_FMT_RGB0, |
| 138 | AV_PIX_FMT_0BGR, AV_PIX_FMT_BGR0, |
| 139 | AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, |
| 140 | AV_PIX_FMT_GRAY8, |
| 141 | AV_PIX_FMT_YUV410P, |
| 142 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, |
| 143 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, |
| 144 | AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA420P, |
| 145 | AV_PIX_FMT_NONE |
| 146 | }; |
| 147 | |
| 148 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | static double get_rotated_w(void *opaque, double angle) |
| 153 | { |
| 154 | RotContext *rot = opaque; |
| 155 | double inw = rot->var_values[VAR_IN_W]; |
| 156 | double inh = rot->var_values[VAR_IN_H]; |
| 157 | float sinx = sin(angle); |
| 158 | float cosx = cos(angle); |
| 159 | |
| 160 | return FFMAX(0, inh * sinx) + FFMAX(0, -inw * cosx) + |
| 161 | FFMAX(0, inw * cosx) + FFMAX(0, -inh * sinx); |
| 162 | } |
| 163 | |
| 164 | static double get_rotated_h(void *opaque, double angle) |
| 165 | { |
| 166 | RotContext *rot = opaque; |
| 167 | double inw = rot->var_values[VAR_IN_W]; |
| 168 | double inh = rot->var_values[VAR_IN_H]; |
| 169 | float sinx = sin(angle); |
| 170 | float cosx = cos(angle); |
| 171 | |
| 172 | return FFMAX(0, -inh * cosx) + FFMAX(0, -inw * sinx) + |
| 173 | FFMAX(0, inh * cosx) + FFMAX(0, inw * sinx); |
| 174 | } |
| 175 | |
| 176 | static double (* const func1[])(void *, double) = { |
| 177 | get_rotated_w, |
| 178 | get_rotated_h, |
| 179 | NULL |
| 180 | }; |
| 181 | |
| 182 | static const char * const func1_names[] = { |
| 183 | "rotw", |
| 184 | "roth", |
| 185 | NULL |
| 186 | }; |
| 187 | |
| 188 | static int config_props(AVFilterLink *outlink) |
| 189 | { |
| 190 | AVFilterContext *ctx = outlink->src; |
| 191 | RotContext *rot = ctx->priv; |
| 192 | AVFilterLink *inlink = ctx->inputs[0]; |
| 193 | const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format); |
| 194 | int ret; |
| 195 | double res; |
| 196 | char *expr; |
| 197 | |
| 198 | ff_draw_init(&rot->draw, inlink->format, 0); |
| 199 | ff_draw_color(&rot->draw, &rot->color, rot->fillcolor); |
| 200 | |
| 201 | rot->hsub = pixdesc->log2_chroma_w; |
| 202 | rot->vsub = pixdesc->log2_chroma_h; |
| 203 | |
| 204 | rot->var_values[VAR_IN_W] = rot->var_values[VAR_IW] = inlink->w; |
| 205 | rot->var_values[VAR_IN_H] = rot->var_values[VAR_IH] = inlink->h; |
| 206 | rot->var_values[VAR_HSUB] = 1<<rot->hsub; |
| 207 | rot->var_values[VAR_VSUB] = 1<<rot->vsub; |
| 208 | rot->var_values[VAR_N] = NAN; |
| 209 | rot->var_values[VAR_T] = NAN; |
| 210 | rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = NAN; |
| 211 | rot->var_values[VAR_OUT_H] = rot->var_values[VAR_OH] = NAN; |
| 212 | |
| 213 | av_expr_free(rot->angle_expr); |
| 214 | rot->angle_expr = NULL; |
| 215 | if ((ret = av_expr_parse(&rot->angle_expr, expr = rot->angle_expr_str, var_names, |
| 216 | func1_names, func1, NULL, NULL, 0, ctx)) < 0) { |
| 217 | av_log(ctx, AV_LOG_ERROR, |
| 218 | "Error occurred parsing angle expression '%s'\n", rot->angle_expr_str); |
| 219 | return ret; |
| 220 | } |
| 221 | |
| 222 | #define SET_SIZE_EXPR(name, opt_name) do { \ |
| 223 | ret = av_expr_parse_and_eval(&res, expr = rot->name##_expr_str, \ |
| 224 | var_names, rot->var_values, \ |
| 225 | func1_names, func1, NULL, NULL, rot, 0, ctx); \ |
| 226 | if (ret < 0 || isnan(res) || isinf(res) || res <= 0) { \ |
| 227 | av_log(ctx, AV_LOG_ERROR, \ |
| 228 | "Error parsing or evaluating expression for option %s: " \ |
| 229 | "invalid expression '%s' or non-positive or indefinite value %f\n", \ |
| 230 | opt_name, expr, res); \ |
| 231 | return ret; \ |
| 232 | } \ |
| 233 | } while (0) |
| 234 | |
| 235 | /* evaluate width and height */ |
| 236 | av_expr_parse_and_eval(&res, expr = rot->outw_expr_str, var_names, rot->var_values, |
| 237 | func1_names, func1, NULL, NULL, rot, 0, ctx); |
| 238 | rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = res; |
| 239 | rot->outw = res + 0.5; |
| 240 | SET_SIZE_EXPR(outh, "out_w"); |
| 241 | rot->var_values[VAR_OUT_H] = rot->var_values[VAR_OH] = res; |
| 242 | rot->outh = res + 0.5; |
| 243 | |
| 244 | /* evaluate the width again, as it may depend on the evaluated output height */ |
| 245 | SET_SIZE_EXPR(outw, "out_h"); |
| 246 | rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = res; |
| 247 | rot->outw = res + 0.5; |
| 248 | |
| 249 | /* compute number of planes */ |
| 250 | rot->nb_planes = av_pix_fmt_count_planes(inlink->format); |
| 251 | outlink->w = rot->outw; |
| 252 | outlink->h = rot->outh; |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | #define FIXP (1<<16) |
| 257 | #define FIXP2 (1<<20) |
| 258 | #define INT_PI 3294199 //(M_PI * FIXP2) |
| 259 | |
| 260 | /** |
| 261 | * Compute the sin of a using integer values. |
| 262 | * Input is scaled by FIXP2 and output values are scaled by FIXP. |
| 263 | */ |
| 264 | static int64_t int_sin(int64_t a) |
| 265 | { |
| 266 | int64_t a2, res = 0; |
| 267 | int i; |
| 268 | if (a < 0) a = INT_PI-a; // 0..inf |
| 269 | a %= 2 * INT_PI; // 0..2PI |
| 270 | |
| 271 | if (a >= INT_PI*3/2) a -= 2*INT_PI; // -PI/2 .. 3PI/2 |
| 272 | if (a >= INT_PI/2 ) a = INT_PI - a; // -PI/2 .. PI/2 |
| 273 | |
| 274 | /* compute sin using Taylor series approximated to the fifth term */ |
| 275 | a2 = (a*a)/(FIXP2); |
| 276 | for (i = 2; i < 11; i += 2) { |
| 277 | res += a; |
| 278 | a = -a*a2 / (FIXP2*i*(i+1)); |
| 279 | } |
| 280 | return (res + 8)>>4; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Interpolate the color in src at position x and y using bilinear |
| 285 | * interpolation. |
| 286 | */ |
| 287 | static uint8_t *interpolate_bilinear(uint8_t *dst_color, |
| 288 | const uint8_t *src, int src_linesize, int src_linestep, |
| 289 | int x, int y, int max_x, int max_y) |
| 290 | { |
| 291 | int int_x = av_clip(x>>16, 0, max_x); |
| 292 | int int_y = av_clip(y>>16, 0, max_y); |
| 293 | int frac_x = x&0xFFFF; |
| 294 | int frac_y = y&0xFFFF; |
| 295 | int i; |
| 296 | int int_x1 = FFMIN(int_x+1, max_x); |
| 297 | int int_y1 = FFMIN(int_y+1, max_y); |
| 298 | |
| 299 | for (i = 0; i < src_linestep; i++) { |
| 300 | int s00 = src[src_linestep * int_x + i + src_linesize * int_y ]; |
| 301 | int s01 = src[src_linestep * int_x1 + i + src_linesize * int_y ]; |
| 302 | int s10 = src[src_linestep * int_x + i + src_linesize * int_y1]; |
| 303 | int s11 = src[src_linestep * int_x1 + i + src_linesize * int_y1]; |
| 304 | int s0 = (((1<<16) - frac_x)*s00 + frac_x*s01); |
| 305 | int s1 = (((1<<16) - frac_x)*s10 + frac_x*s11); |
| 306 | |
| 307 | dst_color[i] = ((int64_t)((1<<16) - frac_y)*s0 + (int64_t)frac_y*s1) >> 32; |
| 308 | } |
| 309 | |
| 310 | return dst_color; |
| 311 | } |
| 312 | |
| 313 | static av_always_inline void copy_elem(uint8_t *pout, const uint8_t *pin, int elem_size) |
| 314 | { |
| 315 | int v; |
| 316 | switch (elem_size) { |
| 317 | case 1: |
| 318 | *pout = *pin; |
| 319 | break; |
| 320 | case 2: |
| 321 | *((uint16_t *)pout) = *((uint16_t *)pin); |
| 322 | break; |
| 323 | case 3: |
| 324 | v = AV_RB24(pin); |
| 325 | AV_WB24(pout, v); |
| 326 | break; |
| 327 | case 4: |
| 328 | *((uint32_t *)pout) = *((uint32_t *)pin); |
| 329 | break; |
| 330 | default: |
| 331 | memcpy(pout, pin, elem_size); |
| 332 | break; |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | static av_always_inline void simple_rotate_internal(uint8_t *dst, const uint8_t *src, int src_linesize, int angle, int elem_size, int len) |
| 337 | { |
| 338 | int i; |
| 339 | switch(angle) { |
| 340 | case 0: |
| 341 | memcpy(dst, src, elem_size * len); |
| 342 | break; |
| 343 | case 1: |
| 344 | for (i = 0; i<len; i++) |
| 345 | copy_elem(dst + i*elem_size, src + (len-i-1)*src_linesize, elem_size); |
| 346 | break; |
| 347 | case 2: |
| 348 | for (i = 0; i<len; i++) |
| 349 | copy_elem(dst + i*elem_size, src + (len-i-1)*elem_size, elem_size); |
| 350 | break; |
| 351 | case 3: |
| 352 | for (i = 0; i<len; i++) |
| 353 | copy_elem(dst + i*elem_size, src + i*src_linesize, elem_size); |
| 354 | break; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | static av_always_inline void simple_rotate(uint8_t *dst, const uint8_t *src, int src_linesize, int angle, int elem_size, int len) |
| 359 | { |
| 360 | switch(elem_size) { |
| 361 | case 1 : simple_rotate_internal(dst, src, src_linesize, angle, 1, len); break; |
| 362 | case 2 : simple_rotate_internal(dst, src, src_linesize, angle, 2, len); break; |
| 363 | case 3 : simple_rotate_internal(dst, src, src_linesize, angle, 3, len); break; |
| 364 | case 4 : simple_rotate_internal(dst, src, src_linesize, angle, 4, len); break; |
| 365 | default: simple_rotate_internal(dst, src, src_linesize, angle, elem_size, len); break; |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb)) |
| 370 | |
| 371 | static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs) |
| 372 | { |
| 373 | ThreadData *td = arg; |
| 374 | AVFrame *in = td->in; |
| 375 | AVFrame *out = td->out; |
| 376 | RotContext *rot = ctx->priv; |
| 377 | const int outw = td->outw, outh = td->outh; |
| 378 | const int inw = td->inw, inh = td->inh; |
| 379 | const int plane = td->plane; |
| 380 | const int xi = td->xi, yi = td->yi; |
| 381 | const int c = td->c, s = td->s; |
| 382 | const int start = (outh * job ) / nb_jobs; |
| 383 | const int end = (outh * (job+1)) / nb_jobs; |
| 384 | int xprime = td->xprime + start * s; |
| 385 | int yprime = td->yprime + start * c; |
| 386 | int i, j, x, y; |
| 387 | |
| 388 | for (j = start; j < end; j++) { |
| 389 | x = xprime + xi + FIXP*(inw-1)/2; |
| 390 | y = yprime + yi + FIXP*(inh-1)/2; |
| 391 | |
| 392 | if (fabs(rot->angle - 0) < FLT_EPSILON && outw == inw && outh == inh) { |
| 393 | simple_rotate(out->data[plane] + j * out->linesize[plane], |
| 394 | in->data[plane] + j * in->linesize[plane], |
| 395 | in->linesize[plane], 0, rot->draw.pixelstep[plane], outw); |
| 396 | } else if (fabs(rot->angle - M_PI/2) < FLT_EPSILON && outw == inh && outh == inw) { |
| 397 | simple_rotate(out->data[plane] + j * out->linesize[plane], |
| 398 | in->data[plane] + j * rot->draw.pixelstep[plane], |
| 399 | in->linesize[plane], 1, rot->draw.pixelstep[plane], outw); |
| 400 | } else if (fabs(rot->angle - M_PI) < FLT_EPSILON && outw == inw && outh == inh) { |
| 401 | simple_rotate(out->data[plane] + j * out->linesize[plane], |
| 402 | in->data[plane] + (outh-j-1) * in->linesize[plane], |
| 403 | in->linesize[plane], 2, rot->draw.pixelstep[plane], outw); |
| 404 | } else if (fabs(rot->angle - 3*M_PI/2) < FLT_EPSILON && outw == inh && outh == inw) { |
| 405 | simple_rotate(out->data[plane] + j * out->linesize[plane], |
| 406 | in->data[plane] + (outh-j-1) * rot->draw.pixelstep[plane], |
| 407 | in->linesize[plane], 3, rot->draw.pixelstep[plane], outw); |
| 408 | } else { |
| 409 | |
| 410 | for (i = 0; i < outw; i++) { |
| 411 | int32_t v; |
| 412 | int x1, y1; |
| 413 | uint8_t *pin, *pout; |
| 414 | x1 = x>>16; |
| 415 | y1 = y>>16; |
| 416 | |
| 417 | /* the out-of-range values avoid border artifacts */ |
| 418 | if (x1 >= -1 && x1 <= inw && y1 >= -1 && y1 <= inh) { |
| 419 | uint8_t inp_inv[4]; /* interpolated input value */ |
| 420 | pout = out->data[plane] + j * out->linesize[plane] + i * rot->draw.pixelstep[plane]; |
| 421 | if (rot->use_bilinear) { |
| 422 | pin = interpolate_bilinear(inp_inv, |
| 423 | in->data[plane], in->linesize[plane], rot->draw.pixelstep[plane], |
| 424 | x, y, inw-1, inh-1); |
| 425 | } else { |
| 426 | int x2 = av_clip(x1, 0, inw-1); |
| 427 | int y2 = av_clip(y1, 0, inh-1); |
| 428 | pin = in->data[plane] + y2 * in->linesize[plane] + x2 * rot->draw.pixelstep[plane]; |
| 429 | } |
| 430 | switch (rot->draw.pixelstep[plane]) { |
| 431 | case 1: |
| 432 | *pout = *pin; |
| 433 | break; |
| 434 | case 2: |
| 435 | *((uint16_t *)pout) = *((uint16_t *)pin); |
| 436 | break; |
| 437 | case 3: |
| 438 | v = AV_RB24(pin); |
| 439 | AV_WB24(pout, v); |
| 440 | break; |
| 441 | case 4: |
| 442 | *((uint32_t *)pout) = *((uint32_t *)pin); |
| 443 | break; |
| 444 | default: |
| 445 | memcpy(pout, pin, rot->draw.pixelstep[plane]); |
| 446 | break; |
| 447 | } |
| 448 | } |
| 449 | x += c; |
| 450 | y -= s; |
| 451 | } |
| 452 | } |
| 453 | xprime += s; |
| 454 | yprime += c; |
| 455 | } |
| 456 | |
| 457 | return 0; |
| 458 | } |
| 459 | |
| 460 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| 461 | { |
| 462 | AVFilterContext *ctx = inlink->dst; |
| 463 | AVFilterLink *outlink = ctx->outputs[0]; |
| 464 | AVFrame *out; |
| 465 | RotContext *rot = ctx->priv; |
| 466 | int angle_int, s, c, plane; |
| 467 | double res; |
| 468 | |
| 469 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 470 | if (!out) { |
| 471 | av_frame_free(&in); |
| 472 | return AVERROR(ENOMEM); |
| 473 | } |
| 474 | av_frame_copy_props(out, in); |
| 475 | |
| 476 | rot->var_values[VAR_N] = inlink->frame_count; |
| 477 | rot->var_values[VAR_T] = TS2T(in->pts, inlink->time_base); |
| 478 | rot->angle = res = av_expr_eval(rot->angle_expr, rot->var_values, rot); |
| 479 | |
| 480 | av_log(ctx, AV_LOG_DEBUG, "n:%f time:%f angle:%f/PI\n", |
| 481 | rot->var_values[VAR_N], rot->var_values[VAR_T], rot->angle/M_PI); |
| 482 | |
| 483 | angle_int = res * FIXP * 16; |
| 484 | s = int_sin(angle_int); |
| 485 | c = int_sin(angle_int + INT_PI/2); |
| 486 | |
| 487 | /* fill background */ |
| 488 | if (rot->fillcolor_enable) |
| 489 | ff_fill_rectangle(&rot->draw, &rot->color, out->data, out->linesize, |
| 490 | 0, 0, outlink->w, outlink->h); |
| 491 | |
| 492 | for (plane = 0; plane < rot->nb_planes; plane++) { |
| 493 | int hsub = plane == 1 || plane == 2 ? rot->hsub : 0; |
| 494 | int vsub = plane == 1 || plane == 2 ? rot->vsub : 0; |
| 495 | const int outw = FF_CEIL_RSHIFT(outlink->w, hsub); |
| 496 | const int outh = FF_CEIL_RSHIFT(outlink->h, vsub); |
| 497 | ThreadData td = { .in = in, .out = out, |
| 498 | .inw = FF_CEIL_RSHIFT(inlink->w, hsub), |
| 499 | .inh = FF_CEIL_RSHIFT(inlink->h, vsub), |
| 500 | .outh = outh, .outw = outw, |
| 501 | .xi = -(outw-1) * c / 2, .yi = (outw-1) * s / 2, |
| 502 | .xprime = -(outh-1) * s / 2, |
| 503 | .yprime = -(outh-1) * c / 2, |
| 504 | .plane = plane, .c = c, .s = s }; |
| 505 | |
| 506 | |
| 507 | ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outh, ctx->graph->nb_threads)); |
| 508 | } |
| 509 | |
| 510 | av_frame_free(&in); |
| 511 | return ff_filter_frame(outlink, out); |
| 512 | } |
| 513 | |
| 514 | static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
| 515 | char *res, int res_len, int flags) |
| 516 | { |
| 517 | RotContext *rot = ctx->priv; |
| 518 | int ret; |
| 519 | |
| 520 | if (!strcmp(cmd, "angle") || !strcmp(cmd, "a")) { |
| 521 | AVExpr *old = rot->angle_expr; |
| 522 | ret = av_expr_parse(&rot->angle_expr, args, var_names, |
| 523 | NULL, NULL, NULL, NULL, 0, ctx); |
| 524 | if (ret < 0) { |
| 525 | av_log(ctx, AV_LOG_ERROR, |
| 526 | "Error when parsing the expression '%s' for angle command\n", args); |
| 527 | rot->angle_expr = old; |
| 528 | return ret; |
| 529 | } |
| 530 | av_expr_free(old); |
| 531 | } else |
| 532 | ret = AVERROR(ENOSYS); |
| 533 | |
| 534 | return ret; |
| 535 | } |
| 536 | |
| 537 | static const AVFilterPad rotate_inputs[] = { |
| 538 | { |
| 539 | .name = "default", |
| 540 | .type = AVMEDIA_TYPE_VIDEO, |
| 541 | .filter_frame = filter_frame, |
| 542 | }, |
| 543 | { NULL } |
| 544 | }; |
| 545 | |
| 546 | static const AVFilterPad rotate_outputs[] = { |
| 547 | { |
| 548 | .name = "default", |
| 549 | .type = AVMEDIA_TYPE_VIDEO, |
| 550 | .config_props = config_props, |
| 551 | }, |
| 552 | { NULL } |
| 553 | }; |
| 554 | |
| 555 | AVFilter ff_vf_rotate = { |
| 556 | .name = "rotate", |
| 557 | .description = NULL_IF_CONFIG_SMALL("Rotate the input image."), |
| 558 | .priv_size = sizeof(RotContext), |
| 559 | .init = init, |
| 560 | .uninit = uninit, |
| 561 | .query_formats = query_formats, |
| 562 | .process_command = process_command, |
| 563 | .inputs = rotate_inputs, |
| 564 | .outputs = rotate_outputs, |
| 565 | .priv_class = &rotate_class, |
| 566 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, |
| 567 | }; |