/* * Copyright (c) 2015 Arwa Arif <arwaarif1994@gmail.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, * or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * FFT domain filtering. */ #include "libavfilter/internal.h" #include "libavutil/common.h" #include "libavutil/imgutils.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "libavcodec/avfft.h" #include "libavutil/eval.h" #define MAX_PLANES 4 enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB }; typedef struct FFTFILTContext { const AVClass *class; int eval_mode; int depth; int nb_planes; int planewidth[MAX_PLANES]; int planeheight[MAX_PLANES]; RDFTContext *hrdft[MAX_PLANES]; RDFTContext *vrdft[MAX_PLANES]; RDFTContext *ihrdft[MAX_PLANES]; RDFTContext *ivrdft[MAX_PLANES]; int rdft_hbits[MAX_PLANES]; int rdft_vbits[MAX_PLANES]; size_t rdft_hlen[MAX_PLANES]; size_t rdft_vlen[MAX_PLANES]; FFTSample *rdft_hdata[MAX_PLANES]; FFTSample *rdft_vdata[MAX_PLANES]; int dc[MAX_PLANES]; char *weight_str[MAX_PLANES]; AVExpr *weight_expr[MAX_PLANES]; double *weight[MAX_PLANES]; } FFTFILTContext; static const char *const var_names[] = { "X", "Y", "W", "H", "N", NULL }; enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_VARS_NB }; enum { Y = 0, U, V }; #define OFFSET(x) offsetof(FFTFILTContext, x) #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM static const AVOption fftfilt_options[] = { { "dc_Y", "adjust gain in Y plane", OFFSET(dc[Y]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS }, { "dc_U", "adjust gain in U plane", OFFSET(dc[U]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS }, { "dc_V", "adjust gain in V plane", OFFSET(dc[V]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS }, { "weight_Y", "set luminance expression in Y plane", OFFSET(weight_str[Y]), AV_OPT_TYPE_STRING, {.str = "1"}, CHAR_MIN, CHAR_MAX, FLAGS }, { "weight_U", "set chrominance expression in U plane", OFFSET(weight_str[U]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, { "weight_V", "set chrominance expression in V plane", OFFSET(weight_str[V]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" }, { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" }, { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" }, {NULL}, }; AVFILTER_DEFINE_CLASS(fftfilt); static inline double lum(void *priv, double x, double y, int plane) { FFTFILTContext *s = priv; return s->rdft_vdata[plane][(int)x * s->rdft_vlen[plane] + (int)y]; } static double weight_Y(void *priv, double x, double y) { return lum(priv, x, y, Y); } static double weight_U(void *priv, double x, double y) { return lum(priv, x, y, U); } static double weight_V(void *priv, double x, double y) { return lum(priv, x, y, V); } static void copy_rev (FFTSample *dest, int w, int w2) { int i; for (i = w; i < w + (w2-w)/2; i++) dest[i] = dest[2*w - i - 1]; for (; i < w2; i++) dest[i] = dest[w2 - i]; } /*Horizontal pass - RDFT*/ static void rdft_horizontal(FFTFILTContext *s, AVFrame *in, int w, int h, int plane) { int i, j; for (i = 0; i < h; i++) { for (j = 0; j < w; j++) s->rdft_hdata[plane][i * s->rdft_hlen[plane] + j] = *(in->data[plane] + in->linesize[plane] * i + j); copy_rev(s->rdft_hdata[plane] + i * s->rdft_hlen[plane], w, s->rdft_hlen[plane]); } for (i = 0; i < h; i++) av_rdft_calc(s->hrdft[plane], s->rdft_hdata[plane] + i * s->rdft_hlen[plane]); } /*Vertical pass - RDFT*/ static void rdft_vertical(FFTFILTContext *s, int h, int plane) { int i, j; for (i = 0; i < s->rdft_hlen[plane]; i++) { for (j = 0; j < h; j++) s->rdft_vdata[plane][i * s->rdft_vlen[plane] + j] = s->rdft_hdata[plane][j * s->rdft_hlen[plane] + i]; copy_rev(s->rdft_vdata[plane] + i * s->rdft_vlen[plane], h, s->rdft_vlen[plane]); } for (i = 0; i < s->rdft_hlen[plane]; i++) av_rdft_calc(s->vrdft[plane], s->rdft_vdata[plane] + i * s->rdft_vlen[plane]); } /*Vertical pass - IRDFT*/ static void irdft_vertical(FFTFILTContext *s, int h, int plane) { int i, j; for (i = 0; i < s->rdft_hlen[plane]; i++) av_rdft_calc(s->ivrdft[plane], s->rdft_vdata[plane] + i * s->rdft_vlen[plane]); for (i = 0; i < s->rdft_hlen[plane]; i++) for (j = 0; j < h; j++) s->rdft_hdata[plane][j * s->rdft_hlen[plane] + i] = s->rdft_vdata[plane][i * s->rdft_vlen[plane] + j]; } /*Horizontal pass - IRDFT*/ static void irdft_horizontal(FFTFILTContext *s, AVFrame *out, int w, int h, int plane) { int i, j; for (i = 0; i < h; i++) av_rdft_calc(s->ihrdft[plane], s->rdft_hdata[plane] + i * s->rdft_hlen[plane]); for (i = 0; i < h; i++) for (j = 0; j < w; j++) *(out->data[plane] + out->linesize[plane] * i + j) = av_clip(s->rdft_hdata[plane][i *s->rdft_hlen[plane] + j] * 4 / (s->rdft_hlen[plane] * s->rdft_vlen[plane]), 0, 255); } static av_cold int initialize(AVFilterContext *ctx) { FFTFILTContext *s = ctx->priv; int ret = 0, plane; if (!s->dc[U] && !s->dc[V]) { s->dc[U] = s->dc[Y]; s->dc[V] = s->dc[Y]; } else { if (!s->dc[U]) s->dc[U] = s->dc[V]; if (!s->dc[V]) s->dc[V] = s->dc[U]; } if (!s->weight_str[U] && !s->weight_str[V]) { s->weight_str[U] = av_strdup(s->weight_str[Y]); s->weight_str[V] = av_strdup(s->weight_str[Y]); } else { if (!s->weight_str[U]) s->weight_str[U] = av_strdup(s->weight_str[V]); if (!s->weight_str[V]) s->weight_str[V] = av_strdup(s->weight_str[U]); } for (plane = 0; plane < 3; plane++) { static double (*p[])(void *, double, double) = { weight_Y, weight_U, weight_V }; const char *const func2_names[] = {"weight_Y", "weight_U", "weight_V", NULL }; double (*func2[])(void *, double, double) = { weight_Y, weight_U, weight_V, p[plane], NULL }; ret = av_expr_parse(&s->weight_expr[plane], s->weight_str[plane], var_names, NULL, NULL, func2_names, func2, 0, ctx); if (ret < 0) break; } return ret; } static void do_eval(FFTFILTContext *s, AVFilterLink *inlink, int plane) { double values[VAR_VARS_NB]; int i, j; values[VAR_N] = inlink->frame_count_out; values[VAR_W] = s->planewidth[plane]; values[VAR_H] = s->planeheight[plane]; for (i = 0; i < s->rdft_hlen[plane]; i++) { values[VAR_X] = i; for (j = 0; j < s->rdft_vlen[plane]; j++) { values[VAR_Y] = j; s->weight[plane][i * s->rdft_vlen[plane] + j] = av_expr_eval(s->weight_expr[plane], values, s); } } } static int config_props(AVFilterLink *inlink) { FFTFILTContext *s = inlink->dst->priv; const AVPixFmtDescriptor *desc; int rdft_hbits, rdft_vbits, i, plane; desc = av_pix_fmt_desc_get(inlink->format); s->depth = desc->comp[0].depth; s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w); s->planewidth[0] = s->planewidth[3] = inlink->w; s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); s->planeheight[0] = s->planeheight[3] = inlink->h; s->nb_planes = av_pix_fmt_count_planes(inlink->format); for (i = 0; i < desc->nb_components; i++) { int w = s->planewidth[i]; int h = s->planeheight[i]; /* RDFT - Array initialization for Horizontal pass*/ for (rdft_hbits = 1; 1 << rdft_hbits < w*10/9; rdft_hbits++); s->rdft_hbits[i] = rdft_hbits; s->rdft_hlen[i] = 1 << rdft_hbits; if (!(s->rdft_hdata[i] = av_malloc_array(h, s->rdft_hlen[i] * sizeof(FFTSample)))) return AVERROR(ENOMEM); if (!(s->hrdft[i] = av_rdft_init(s->rdft_hbits[i], DFT_R2C))) return AVERROR(ENOMEM); if (!(s->ihrdft[i] = av_rdft_init(s->rdft_hbits[i], IDFT_C2R))) return AVERROR(ENOMEM); /* RDFT - Array initialization for Vertical pass*/ for (rdft_vbits = 1; 1 << rdft_vbits < h*10/9; rdft_vbits++); s->rdft_vbits[i] = rdft_vbits; s->rdft_vlen[i] = 1 << rdft_vbits; if (!(s->rdft_vdata[i] = av_malloc_array(s->rdft_hlen[i], s->rdft_vlen[i] * sizeof(FFTSample)))) return AVERROR(ENOMEM); if (!(s->vrdft[i] = av_rdft_init(s->rdft_vbits[i], DFT_R2C))) return AVERROR(ENOMEM); if (!(s->ivrdft[i] = av_rdft_init(s->rdft_vbits[i], IDFT_C2R))) return AVERROR(ENOMEM); } /*Luminance value - Array initialization*/ for (plane = 0; plane < 3; plane++) { if(!(s->weight[plane] = av_malloc_array(s->rdft_hlen[plane], s->rdft_vlen[plane] * sizeof(double)))) return AVERROR(ENOMEM); if (s->eval_mode == EVAL_MODE_INIT) do_eval(s, inlink, plane); } return 0; } static int filter_frame(AVFilterLink *inlink, AVFrame *in) { AVFilterContext *ctx = inlink->dst; AVFilterLink *outlink = inlink->dst->outputs[0]; FFTFILTContext *s = ctx->priv; AVFrame *out; int i, j, plane; out = ff_get_video_buffer(outlink, inlink->w, inlink->h); if (!out) { av_frame_free(&in); return AVERROR(ENOMEM); } av_frame_copy_props(out, in); for (plane = 0; plane < s->nb_planes; plane++) { int w = s->planewidth[plane]; int h = s->planeheight[plane]; if (s->eval_mode == EVAL_MODE_FRAME) do_eval(s, inlink, plane); rdft_horizontal(s, in, w, h, plane); rdft_vertical(s, h, plane); /*Change user defined parameters*/ for (i = 0; i < s->rdft_hlen[plane]; i++) for (j = 0; j < s->rdft_vlen[plane]; j++) s->rdft_vdata[plane][i * s->rdft_vlen[plane] + j] *= s->weight[plane][i * s->rdft_vlen[plane] + j]; s->rdft_vdata[plane][0] += s->rdft_hlen[plane] * s->rdft_vlen[plane] * s->dc[plane]; irdft_vertical(s, h, plane); irdft_horizontal(s, out, w, h, plane); } av_frame_free(&in); return ff_filter_frame(outlink, out); } static av_cold void uninit(AVFilterContext *ctx) { FFTFILTContext *s = ctx->priv; int i; for (i = 0; i < MAX_PLANES; i++) { av_free(s->rdft_hdata[i]); av_free(s->rdft_vdata[i]); av_expr_free(s->weight_expr[i]); av_free(s->weight[i]); av_rdft_end(s->hrdft[i]); av_rdft_end(s->ihrdft[i]); av_rdft_end(s->vrdft[i]); av_rdft_end(s->ivrdft[i]); } } static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pixel_fmts_fftfilt[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_NONE }; AVFilterFormats *fmts_list = ff_make_format_list(pixel_fmts_fftfilt); if (!fmts_list) return AVERROR(ENOMEM); return ff_set_common_formats(ctx, fmts_list); } static const AVFilterPad fftfilt_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = config_props, .filter_frame = filter_frame, }, { NULL } }; static const AVFilterPad fftfilt_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter ff_vf_fftfilt = { .name = "fftfilt", .description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to pixels in frequency domain."), .priv_size = sizeof(FFTFILTContext), .priv_class = &fftfilt_class, .inputs = fftfilt_inputs, .outputs = fftfilt_outputs, .query_formats = query_formats, .init = initialize, .uninit = uninit, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, };