| 1 | /* |
| 2 | * Copyright (c) 2011 Stefano Sabatini |
| 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 | /** |
| 22 | * @file |
| 23 | * filter for selecting which frame passes in the filterchain |
| 24 | */ |
| 25 | |
| 26 | #include "libavutil/avstring.h" |
| 27 | #include "libavutil/eval.h" |
| 28 | #include "libavutil/fifo.h" |
| 29 | #include "libavutil/internal.h" |
| 30 | #include "libavutil/opt.h" |
| 31 | #include "libavutil/pixelutils.h" |
| 32 | #include "avfilter.h" |
| 33 | #include "audio.h" |
| 34 | #include "formats.h" |
| 35 | #include "internal.h" |
| 36 | #include "video.h" |
| 37 | |
| 38 | static const char *const var_names[] = { |
| 39 | "TB", ///< timebase |
| 40 | |
| 41 | "pts", ///< original pts in the file of the frame |
| 42 | "start_pts", ///< first PTS in the stream, expressed in TB units |
| 43 | "prev_pts", ///< previous frame PTS |
| 44 | "prev_selected_pts", ///< previous selected frame PTS |
| 45 | |
| 46 | "t", ///< timestamp expressed in seconds |
| 47 | "start_t", ///< first PTS in the stream, expressed in seconds |
| 48 | "prev_t", ///< previous frame time |
| 49 | "prev_selected_t", ///< previously selected time |
| 50 | |
| 51 | "pict_type", ///< the type of picture in the movie |
| 52 | "I", |
| 53 | "P", |
| 54 | "B", |
| 55 | "S", |
| 56 | "SI", |
| 57 | "SP", |
| 58 | "BI", |
| 59 | "PICT_TYPE_I", |
| 60 | "PICT_TYPE_P", |
| 61 | "PICT_TYPE_B", |
| 62 | "PICT_TYPE_S", |
| 63 | "PICT_TYPE_SI", |
| 64 | "PICT_TYPE_SP", |
| 65 | "PICT_TYPE_BI", |
| 66 | |
| 67 | "interlace_type", ///< the frame interlace type |
| 68 | "PROGRESSIVE", |
| 69 | "TOPFIRST", |
| 70 | "BOTTOMFIRST", |
| 71 | |
| 72 | "consumed_samples_n",///< number of samples consumed by the filter (only audio) |
| 73 | "samples_n", ///< number of samples in the current frame (only audio) |
| 74 | "sample_rate", ///< sample rate (only audio) |
| 75 | |
| 76 | "n", ///< frame number (starting from zero) |
| 77 | "selected_n", ///< selected frame number (starting from zero) |
| 78 | "prev_selected_n", ///< number of the last selected frame |
| 79 | |
| 80 | "key", ///< tell if the frame is a key frame |
| 81 | "pos", ///< original position in the file of the frame |
| 82 | |
| 83 | "scene", |
| 84 | |
| 85 | NULL |
| 86 | }; |
| 87 | |
| 88 | enum var_name { |
| 89 | VAR_TB, |
| 90 | |
| 91 | VAR_PTS, |
| 92 | VAR_START_PTS, |
| 93 | VAR_PREV_PTS, |
| 94 | VAR_PREV_SELECTED_PTS, |
| 95 | |
| 96 | VAR_T, |
| 97 | VAR_START_T, |
| 98 | VAR_PREV_T, |
| 99 | VAR_PREV_SELECTED_T, |
| 100 | |
| 101 | VAR_PICT_TYPE, |
| 102 | VAR_I, |
| 103 | VAR_P, |
| 104 | VAR_B, |
| 105 | VAR_S, |
| 106 | VAR_SI, |
| 107 | VAR_SP, |
| 108 | VAR_BI, |
| 109 | VAR_PICT_TYPE_I, |
| 110 | VAR_PICT_TYPE_P, |
| 111 | VAR_PICT_TYPE_B, |
| 112 | VAR_PICT_TYPE_S, |
| 113 | VAR_PICT_TYPE_SI, |
| 114 | VAR_PICT_TYPE_SP, |
| 115 | VAR_PICT_TYPE_BI, |
| 116 | |
| 117 | VAR_INTERLACE_TYPE, |
| 118 | VAR_INTERLACE_TYPE_P, |
| 119 | VAR_INTERLACE_TYPE_T, |
| 120 | VAR_INTERLACE_TYPE_B, |
| 121 | |
| 122 | VAR_CONSUMED_SAMPLES_N, |
| 123 | VAR_SAMPLES_N, |
| 124 | VAR_SAMPLE_RATE, |
| 125 | |
| 126 | VAR_N, |
| 127 | VAR_SELECTED_N, |
| 128 | VAR_PREV_SELECTED_N, |
| 129 | |
| 130 | VAR_KEY, |
| 131 | VAR_POS, |
| 132 | |
| 133 | VAR_SCENE, |
| 134 | |
| 135 | VAR_VARS_NB |
| 136 | }; |
| 137 | |
| 138 | typedef struct SelectContext { |
| 139 | const AVClass *class; |
| 140 | char *expr_str; |
| 141 | AVExpr *expr; |
| 142 | double var_values[VAR_VARS_NB]; |
| 143 | int do_scene_detect; ///< 1 if the expression requires scene detection variables, 0 otherwise |
| 144 | av_pixelutils_sad_fn sad; ///< Sum of the absolute difference function (scene detect only) |
| 145 | double prev_mafd; ///< previous MAFD (scene detect only) |
| 146 | AVFrame *prev_picref; ///< previous frame (scene detect only) |
| 147 | double select; |
| 148 | int select_out; ///< mark the selected output pad index |
| 149 | int nb_outputs; |
| 150 | } SelectContext; |
| 151 | |
| 152 | #define OFFSET(x) offsetof(SelectContext, x) |
| 153 | #define DEFINE_OPTIONS(filt_name, FLAGS) \ |
| 154 | static const AVOption filt_name##_options[] = { \ |
| 155 | { "expr", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \ |
| 156 | { "e", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \ |
| 157 | { "outputs", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \ |
| 158 | { "n", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \ |
| 159 | { NULL } \ |
| 160 | } |
| 161 | |
| 162 | static int request_frame(AVFilterLink *outlink); |
| 163 | |
| 164 | static av_cold int init(AVFilterContext *ctx) |
| 165 | { |
| 166 | SelectContext *select = ctx->priv; |
| 167 | int i, ret; |
| 168 | |
| 169 | if ((ret = av_expr_parse(&select->expr, select->expr_str, |
| 170 | var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) { |
| 171 | av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", |
| 172 | select->expr_str); |
| 173 | return ret; |
| 174 | } |
| 175 | select->do_scene_detect = !!strstr(select->expr_str, "scene"); |
| 176 | |
| 177 | for (i = 0; i < select->nb_outputs; i++) { |
| 178 | AVFilterPad pad = { 0 }; |
| 179 | |
| 180 | pad.name = av_asprintf("output%d", i); |
| 181 | if (!pad.name) |
| 182 | return AVERROR(ENOMEM); |
| 183 | pad.type = ctx->filter->inputs[0].type; |
| 184 | pad.request_frame = request_frame; |
| 185 | ff_insert_outpad(ctx, i, &pad); |
| 186 | } |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | #define INTERLACE_TYPE_P 0 |
| 192 | #define INTERLACE_TYPE_T 1 |
| 193 | #define INTERLACE_TYPE_B 2 |
| 194 | |
| 195 | static int config_input(AVFilterLink *inlink) |
| 196 | { |
| 197 | SelectContext *select = inlink->dst->priv; |
| 198 | |
| 199 | select->var_values[VAR_N] = 0.0; |
| 200 | select->var_values[VAR_SELECTED_N] = 0.0; |
| 201 | |
| 202 | select->var_values[VAR_TB] = av_q2d(inlink->time_base); |
| 203 | |
| 204 | select->var_values[VAR_PREV_PTS] = NAN; |
| 205 | select->var_values[VAR_PREV_SELECTED_PTS] = NAN; |
| 206 | select->var_values[VAR_PREV_SELECTED_T] = NAN; |
| 207 | select->var_values[VAR_PREV_T] = NAN; |
| 208 | select->var_values[VAR_START_PTS] = NAN; |
| 209 | select->var_values[VAR_START_T] = NAN; |
| 210 | |
| 211 | select->var_values[VAR_I] = AV_PICTURE_TYPE_I; |
| 212 | select->var_values[VAR_P] = AV_PICTURE_TYPE_P; |
| 213 | select->var_values[VAR_B] = AV_PICTURE_TYPE_B; |
| 214 | select->var_values[VAR_SI] = AV_PICTURE_TYPE_SI; |
| 215 | select->var_values[VAR_SP] = AV_PICTURE_TYPE_SP; |
| 216 | select->var_values[VAR_BI] = AV_PICTURE_TYPE_BI; |
| 217 | select->var_values[VAR_PICT_TYPE_I] = AV_PICTURE_TYPE_I; |
| 218 | select->var_values[VAR_PICT_TYPE_P] = AV_PICTURE_TYPE_P; |
| 219 | select->var_values[VAR_PICT_TYPE_B] = AV_PICTURE_TYPE_B; |
| 220 | select->var_values[VAR_PICT_TYPE_SI] = AV_PICTURE_TYPE_SI; |
| 221 | select->var_values[VAR_PICT_TYPE_SP] = AV_PICTURE_TYPE_SP; |
| 222 | select->var_values[VAR_PICT_TYPE_BI] = AV_PICTURE_TYPE_BI; |
| 223 | |
| 224 | select->var_values[VAR_INTERLACE_TYPE_P] = INTERLACE_TYPE_P; |
| 225 | select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T; |
| 226 | select->var_values[VAR_INTERLACE_TYPE_B] = INTERLACE_TYPE_B; |
| 227 | |
| 228 | select->var_values[VAR_PICT_TYPE] = NAN; |
| 229 | select->var_values[VAR_INTERLACE_TYPE] = NAN; |
| 230 | select->var_values[VAR_SCENE] = NAN; |
| 231 | select->var_values[VAR_CONSUMED_SAMPLES_N] = NAN; |
| 232 | select->var_values[VAR_SAMPLES_N] = NAN; |
| 233 | |
| 234 | select->var_values[VAR_SAMPLE_RATE] = |
| 235 | inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN; |
| 236 | |
| 237 | if (select->do_scene_detect) { |
| 238 | select->sad = av_pixelutils_get_sad_fn(3, 3, 2, select); // 8x8 both sources aligned |
| 239 | if (!select->sad) |
| 240 | return AVERROR(EINVAL); |
| 241 | } |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static double get_scene_score(AVFilterContext *ctx, AVFrame *frame) |
| 246 | { |
| 247 | double ret = 0; |
| 248 | SelectContext *select = ctx->priv; |
| 249 | AVFrame *prev_picref = select->prev_picref; |
| 250 | |
| 251 | if (prev_picref && |
| 252 | frame->height == prev_picref->height && |
| 253 | frame->width == prev_picref->width) { |
| 254 | int x, y, nb_sad = 0; |
| 255 | int64_t sad = 0; |
| 256 | double mafd, diff; |
| 257 | uint8_t *p1 = frame->data[0]; |
| 258 | uint8_t *p2 = prev_picref->data[0]; |
| 259 | const int p1_linesize = frame->linesize[0]; |
| 260 | const int p2_linesize = prev_picref->linesize[0]; |
| 261 | |
| 262 | for (y = 0; y < frame->height - 7; y += 8) { |
| 263 | for (x = 0; x < frame->width*3 - 7; x += 8) { |
| 264 | sad += select->sad(p1 + x, p1_linesize, p2 + x, p2_linesize); |
| 265 | nb_sad += 8 * 8; |
| 266 | } |
| 267 | p1 += 8 * p1_linesize; |
| 268 | p2 += 8 * p2_linesize; |
| 269 | } |
| 270 | emms_c(); |
| 271 | mafd = nb_sad ? (double)sad / nb_sad : 0; |
| 272 | diff = fabs(mafd - select->prev_mafd); |
| 273 | ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1); |
| 274 | select->prev_mafd = mafd; |
| 275 | av_frame_free(&prev_picref); |
| 276 | } |
| 277 | select->prev_picref = av_frame_clone(frame); |
| 278 | return ret; |
| 279 | } |
| 280 | |
| 281 | #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d)) |
| 282 | #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)) |
| 283 | |
| 284 | static void select_frame(AVFilterContext *ctx, AVFrame *frame) |
| 285 | { |
| 286 | SelectContext *select = ctx->priv; |
| 287 | AVFilterLink *inlink = ctx->inputs[0]; |
| 288 | double res; |
| 289 | |
| 290 | if (isnan(select->var_values[VAR_START_PTS])) |
| 291 | select->var_values[VAR_START_PTS] = TS2D(frame->pts); |
| 292 | if (isnan(select->var_values[VAR_START_T])) |
| 293 | select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base); |
| 294 | |
| 295 | select->var_values[VAR_N ] = inlink->frame_count; |
| 296 | select->var_values[VAR_PTS] = TS2D(frame->pts); |
| 297 | select->var_values[VAR_T ] = TS2D(frame->pts) * av_q2d(inlink->time_base); |
| 298 | select->var_values[VAR_POS] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame); |
| 299 | select->var_values[VAR_KEY] = frame->key_frame; |
| 300 | |
| 301 | switch (inlink->type) { |
| 302 | case AVMEDIA_TYPE_AUDIO: |
| 303 | select->var_values[VAR_SAMPLES_N] = frame->nb_samples; |
| 304 | break; |
| 305 | |
| 306 | case AVMEDIA_TYPE_VIDEO: |
| 307 | select->var_values[VAR_INTERLACE_TYPE] = |
| 308 | !frame->interlaced_frame ? INTERLACE_TYPE_P : |
| 309 | frame->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B; |
| 310 | select->var_values[VAR_PICT_TYPE] = frame->pict_type; |
| 311 | if (select->do_scene_detect) { |
| 312 | char buf[32]; |
| 313 | select->var_values[VAR_SCENE] = get_scene_score(ctx, frame); |
| 314 | // TODO: document metadata |
| 315 | snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]); |
| 316 | av_dict_set(avpriv_frame_get_metadatap(frame), "lavfi.scene_score", buf, 0); |
| 317 | } |
| 318 | break; |
| 319 | } |
| 320 | |
| 321 | select->select = res = av_expr_eval(select->expr, select->var_values, NULL); |
| 322 | av_log(inlink->dst, AV_LOG_DEBUG, |
| 323 | "n:%f pts:%f t:%f key:%d", |
| 324 | select->var_values[VAR_N], |
| 325 | select->var_values[VAR_PTS], |
| 326 | select->var_values[VAR_T], |
| 327 | frame->key_frame); |
| 328 | |
| 329 | switch (inlink->type) { |
| 330 | case AVMEDIA_TYPE_VIDEO: |
| 331 | av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c scene:%f", |
| 332 | (!frame->interlaced_frame) ? 'P' : |
| 333 | frame->top_field_first ? 'T' : 'B', |
| 334 | av_get_picture_type_char(frame->pict_type), |
| 335 | select->var_values[VAR_SCENE]); |
| 336 | break; |
| 337 | case AVMEDIA_TYPE_AUDIO: |
| 338 | av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%f", |
| 339 | frame->nb_samples, |
| 340 | select->var_values[VAR_CONSUMED_SAMPLES_N]); |
| 341 | break; |
| 342 | } |
| 343 | |
| 344 | if (res == 0) { |
| 345 | select->select_out = -1; /* drop */ |
| 346 | } else if (isnan(res) || res < 0) { |
| 347 | select->select_out = 0; /* first output */ |
| 348 | } else { |
| 349 | select->select_out = FFMIN(ceilf(res)-1, select->nb_outputs-1); /* other outputs */ |
| 350 | } |
| 351 | |
| 352 | av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f select_out:%d\n", res, select->select_out); |
| 353 | |
| 354 | if (res) { |
| 355 | select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N]; |
| 356 | select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS]; |
| 357 | select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T]; |
| 358 | select->var_values[VAR_SELECTED_N] += 1.0; |
| 359 | if (inlink->type == AVMEDIA_TYPE_AUDIO) |
| 360 | select->var_values[VAR_CONSUMED_SAMPLES_N] += frame->nb_samples; |
| 361 | } |
| 362 | |
| 363 | select->var_values[VAR_PREV_PTS] = select->var_values[VAR_PTS]; |
| 364 | select->var_values[VAR_PREV_T] = select->var_values[VAR_T]; |
| 365 | } |
| 366 | |
| 367 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
| 368 | { |
| 369 | AVFilterContext *ctx = inlink->dst; |
| 370 | SelectContext *select = ctx->priv; |
| 371 | |
| 372 | select_frame(ctx, frame); |
| 373 | if (select->select) |
| 374 | return ff_filter_frame(ctx->outputs[select->select_out], frame); |
| 375 | |
| 376 | av_frame_free(&frame); |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | static int request_frame(AVFilterLink *outlink) |
| 381 | { |
| 382 | AVFilterContext *ctx = outlink->src; |
| 383 | SelectContext *select = ctx->priv; |
| 384 | AVFilterLink *inlink = outlink->src->inputs[0]; |
| 385 | int out_no = FF_OUTLINK_IDX(outlink); |
| 386 | |
| 387 | do { |
| 388 | int ret = ff_request_frame(inlink); |
| 389 | if (ret < 0) |
| 390 | return ret; |
| 391 | } while (select->select_out != out_no); |
| 392 | |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | static av_cold void uninit(AVFilterContext *ctx) |
| 397 | { |
| 398 | SelectContext *select = ctx->priv; |
| 399 | int i; |
| 400 | |
| 401 | av_expr_free(select->expr); |
| 402 | select->expr = NULL; |
| 403 | |
| 404 | for (i = 0; i < ctx->nb_outputs; i++) |
| 405 | av_freep(&ctx->output_pads[i].name); |
| 406 | |
| 407 | if (select->do_scene_detect) { |
| 408 | av_frame_free(&select->prev_picref); |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | static int query_formats(AVFilterContext *ctx) |
| 413 | { |
| 414 | SelectContext *select = ctx->priv; |
| 415 | |
| 416 | if (!select->do_scene_detect) { |
| 417 | return ff_default_query_formats(ctx); |
| 418 | } else { |
| 419 | static const enum AVPixelFormat pix_fmts[] = { |
| 420 | AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, |
| 421 | AV_PIX_FMT_NONE |
| 422 | }; |
| 423 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| 424 | } |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | #if CONFIG_ASELECT_FILTER |
| 429 | |
| 430 | DEFINE_OPTIONS(aselect, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM); |
| 431 | AVFILTER_DEFINE_CLASS(aselect); |
| 432 | |
| 433 | static av_cold int aselect_init(AVFilterContext *ctx) |
| 434 | { |
| 435 | SelectContext *select = ctx->priv; |
| 436 | int ret; |
| 437 | |
| 438 | if ((ret = init(ctx)) < 0) |
| 439 | return ret; |
| 440 | |
| 441 | if (select->do_scene_detect) { |
| 442 | av_log(ctx, AV_LOG_ERROR, "Scene detection is ignored in aselect filter\n"); |
| 443 | return AVERROR(EINVAL); |
| 444 | } |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | static const AVFilterPad avfilter_af_aselect_inputs[] = { |
| 450 | { |
| 451 | .name = "default", |
| 452 | .type = AVMEDIA_TYPE_AUDIO, |
| 453 | .config_props = config_input, |
| 454 | .filter_frame = filter_frame, |
| 455 | }, |
| 456 | { NULL } |
| 457 | }; |
| 458 | |
| 459 | AVFilter ff_af_aselect = { |
| 460 | .name = "aselect", |
| 461 | .description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."), |
| 462 | .init = aselect_init, |
| 463 | .uninit = uninit, |
| 464 | .priv_size = sizeof(SelectContext), |
| 465 | .inputs = avfilter_af_aselect_inputs, |
| 466 | .priv_class = &aselect_class, |
| 467 | .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS, |
| 468 | }; |
| 469 | #endif /* CONFIG_ASELECT_FILTER */ |
| 470 | |
| 471 | #if CONFIG_SELECT_FILTER |
| 472 | |
| 473 | DEFINE_OPTIONS(select, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM); |
| 474 | AVFILTER_DEFINE_CLASS(select); |
| 475 | |
| 476 | static av_cold int select_init(AVFilterContext *ctx) |
| 477 | { |
| 478 | int ret; |
| 479 | |
| 480 | if ((ret = init(ctx)) < 0) |
| 481 | return ret; |
| 482 | |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | static const AVFilterPad avfilter_vf_select_inputs[] = { |
| 487 | { |
| 488 | .name = "default", |
| 489 | .type = AVMEDIA_TYPE_VIDEO, |
| 490 | .config_props = config_input, |
| 491 | .filter_frame = filter_frame, |
| 492 | }, |
| 493 | { NULL } |
| 494 | }; |
| 495 | |
| 496 | AVFilter ff_vf_select = { |
| 497 | .name = "select", |
| 498 | .description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."), |
| 499 | .init = select_init, |
| 500 | .uninit = uninit, |
| 501 | .query_formats = query_formats, |
| 502 | .priv_size = sizeof(SelectContext), |
| 503 | .priv_class = &select_class, |
| 504 | .inputs = avfilter_vf_select_inputs, |
| 505 | .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS, |
| 506 | }; |
| 507 | #endif /* CONFIG_SELECT_FILTER */ |