On Sat, Feb 28, 2015 at 2:42 PM, Carl Eugen Hoyos <ceho...@ag.or.at> wrote:
> arwa arif <arwaarif1994 <at> gmail.com> writes: > > > * FFmpeg is free software; you can redistribute it and/or modify > > * it under the terms of the GNU General Public License as published by > > If you want this filter to be licensed under GPL you > have to add a line to configure. > > I am sorry I didn't pay attention to the licensing part. I have updated it to LGPL. > Carl Eugen > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >
From 63bd20d116464dc37db1a02b714a934a7d1ca912 Mon Sep 17 00:00:00 2001 From: Arwa Arif <arwaarif1...@gmail.com> Date: Tue, 24 Feb 2015 12:17:30 +0530 Subject: [PATCH] Port FFT domain filter. --- libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/vf_fftfilt.c | 238 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 240 insertions(+) create mode 100644 libavfilter/vf_fftfilt.c diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 289c63b..b184f07 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -120,6 +120,7 @@ OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o OBJS-$(CONFIG_EQ_FILTER) += vf_eq.o OBJS-$(CONFIG_EXTRACTPLANES_FILTER) += vf_extractplanes.o OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o +OBJS-$(CONFIG_FFTFILT_FILTER) += vf_fftfilt.o OBJS-$(CONFIG_FIELD_FILTER) += vf_field.o OBJS-$(CONFIG_FIELDMATCH_FILTER) += vf_fieldmatch.o OBJS-$(CONFIG_FIELDORDER_FILTER) += vf_fieldorder.o diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index 55de154..043ac56 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -136,6 +136,7 @@ void avfilter_register_all(void) REGISTER_FILTER(EQ, eq, vf); REGISTER_FILTER(EXTRACTPLANES, extractplanes, vf); REGISTER_FILTER(FADE, fade, vf); + REGISTER_FILTER(FFTFILT, fftfilt, vf); REGISTER_FILTER(FIELD, field, vf); REGISTER_FILTER(FIELDMATCH, fieldmatch, vf); REGISTER_FILTER(FIELDORDER, fieldorder, vf); diff --git a/libavfilter/vf_fftfilt.c b/libavfilter/vf_fftfilt.c new file mode 100644 index 0000000..a9dc107 --- /dev/null +++ b/libavfilter/vf_fftfilt.c @@ -0,0 +1,238 @@ +/* + * Copyright (c) 2015 Arwa Arif <arwaarif1...@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" + +typedef struct { + const AVClass *class; + + RDFTContext *rdft; + int rdft_hbits; + int rdft_vbits; + size_t rdft_vlen; + FFTSample *rdft_hdata; + FFTSample *rdft_vdata; + + int dc; + char *lum_str; + AVExpr *lum_expr; + +} FFTFILTContext; + +static const char *const var_names[] = { "X", "Y", "W", "H", NULL }; +enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_VARS_NB }; + +#define OFFSET(x) offsetof(FFTFILTContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM + +static const AVOption fftfilt_options[] = { + { "dc", "adjust gain", OFFSET(dc), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS }, + { "lum", "set luminance expression", OFFSET(lum_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, + {NULL}, +}; + +AVFILTER_DEFINE_CLASS(fftfilt); + +static inline double lum(void *priv, double x, double y) +{ + FFTFILTContext *fftfilt = priv; + FFTSample *rdft_data = fftfilt->rdft_vdata; + size_t rdft_vlen = fftfilt->rdft_vlen; + + return rdft_data[(int)x * rdft_vlen + (int)y]; +} + +static av_cold int initialize(AVFilterContext *ctx) +{ + FFTFILTContext *fftfilt = ctx->priv; + int ret = 0; + + static double (*p[])(void *, double, double) = {lum}; + const char *const func2_names[] = {"lum", NULL }; + double (*func2[])(void *, double, double) = {lum, p[0], NULL }; + ret = av_expr_parse(&fftfilt->lum_expr, fftfilt->lum_str, var_names, NULL, NULL, func2_names, func2, 0, ctx); + return ret; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + AVFilterContext *ctx = inlink->dst; + AVFilterLink *outlink = inlink->dst->outputs[0]; + FFTFILTContext *fftfilt = ctx->priv; + AVFrame *out; + int i, j, rdft_hbits, rdft_vbits; + size_t rdft_hlen, rdft_vlen, w, h; + double values[VAR_VARS_NB]; + + w = inlink->w; + h = inlink->h; + + /* RDFT - Array initialization for Horizontal pass*/ + for (rdft_hbits = 1; 1 << rdft_hbits < w; rdft_hbits++); + rdft_hlen = 1 << rdft_hbits; + if (!(fftfilt->rdft_hdata = av_malloc_array(h, rdft_hlen * sizeof(FFTSample)))) + return AVERROR(ENOMEM); + + /* RDFT - Array initialization for Vertical pass*/ + for (rdft_vbits = 1; 1 << rdft_vbits < h; rdft_vbits++); + rdft_vlen = 1 << rdft_vbits; + if (!(fftfilt->rdft_vdata = av_malloc_array(rdft_hlen, rdft_vlen * sizeof(FFTSample)))) + return AVERROR(ENOMEM); + fftfilt->rdft_vlen = rdft_vlen; + + out = ff_get_video_buffer(outlink, inlink->w, inlink->h); + if (!out) + return AVERROR(ENOMEM); + + av_frame_copy_props(out, in); + + /*Horizontal pass - RDFT*/ + fftfilt->rdft = av_rdft_init(rdft_hbits, DFT_R2C); + for (i = 0; i < h; i++) + { + memset(fftfilt->rdft_hdata + i * rdft_hlen, 0, rdft_hlen * sizeof(*fftfilt->rdft_hdata)); + for (j = 0; j < w; j++) + fftfilt->rdft_hdata[i * rdft_hlen + j] = *(in->data[0] + in->linesize[0] * i + j); + } + + for (i = 0; i < h; i++) + av_rdft_calc(fftfilt->rdft, fftfilt->rdft_hdata + i * rdft_hlen); + + av_rdft_end(fftfilt->rdft); + + /*Vertical pass - RDFT*/ + fftfilt->rdft = av_rdft_init(rdft_vbits, DFT_R2C); + for (i = 0; i < rdft_hlen; i++) + { + memset(fftfilt->rdft_vdata + i * rdft_vlen, 0, rdft_vlen * sizeof(*fftfilt->rdft_vdata)); + for (j = 0; j < h; j++) + fftfilt->rdft_vdata[i * rdft_vlen + j] = fftfilt->rdft_hdata[j * rdft_hlen + i]; + } + + for (i = 0; i < rdft_hlen; i++) + av_rdft_calc(fftfilt->rdft, fftfilt->rdft_vdata + i * rdft_vlen); + + av_rdft_end(fftfilt->rdft); + + /*Change user defined parameters*/ + values[VAR_W] = w; + values[VAR_H] = h; + + for (i = 0; i < rdft_hlen; i++) + { + values[VAR_X] = i; + for (j = 0; j < rdft_vlen; j++) + { + values[VAR_Y] = j; + fftfilt->rdft_vdata[i * rdft_vlen + j] *= av_expr_eval(fftfilt->lum_expr, values, fftfilt); + } + } + fftfilt->rdft_vdata[0] += rdft_hlen * rdft_vlen * fftfilt->dc; + + /*Vertical pass - IRDFT*/ + fftfilt->rdft = av_rdft_init(rdft_vbits, IDFT_C2R); + + for (i = 0; i < rdft_hlen; i++) + av_rdft_calc(fftfilt->rdft, fftfilt->rdft_vdata + i * rdft_vlen); + + for (i = 0; i < rdft_hlen; i++) + for (j = 0; j < h; j++) + fftfilt->rdft_hdata[j * rdft_hlen + i] = fftfilt->rdft_vdata[i * rdft_vlen + j]; + + av_rdft_end(fftfilt->rdft); + + /*Horizontal pass - IRDFT*/ + fftfilt->rdft = av_rdft_init(rdft_hbits, IDFT_C2R); + + for (i = 0; i < h; i++) + av_rdft_calc(fftfilt->rdft, fftfilt->rdft_hdata + i * rdft_hlen); + + for (i = 0; i < h; i++) + for (j = 0; j < w; j++) + *(out->data[0] + out->linesize[0] * i + j) = av_clip(fftfilt->rdft_hdata[i * rdft_hlen + j] + * 4 / (rdft_hlen * rdft_vlen), 0, 255); + + av_rdft_end(fftfilt->rdft); + + av_free(fftfilt->rdft_hdata); + av_free(fftfilt->rdft_vdata); + + av_frame_free(&in); + + return ff_filter_frame(outlink, out); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + FFTFILTContext *fftfilt = ctx->priv; + av_expr_free(fftfilt->lum_expr); +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pixel_fmts_fftfilt[] = { + AV_PIX_FMT_GRAY8, + AV_PIX_FMT_NONE + }; + + ff_set_common_formats(ctx, ff_make_format_list(pixel_fmts_fftfilt)); + + return 0; +} + +static const AVFilterPad fftfilt_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .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("Adjust gain."), + .priv_size = sizeof(FFTFILTContext), + .priv_class = &fftfilt_class, + .inputs = fftfilt_inputs, + .outputs = fftfilt_outputs, + .query_formats = query_formats, + .init = initialize, + .uninit = uninit, +}; -- 1.7.9.5
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