Updated the patch.
From ba761516b97b146f4c62d6c5c08dc5ea02c06af5 Mon Sep 17 00:00:00 2001
From: Arwa Arif <[email protected]>
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 | 258 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 260 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..6d0a961
--- /dev/null
+++ b/libavfilter/vf_fftfilt.c
@@ -0,0 +1,258 @@
+/*
+ * Copyright (c) 2015 Arwa Arif <[email protected]>
+ *
+ * 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_hlen;
+ size_t rdft_vlen;
+ FFTSample *rdft_hdata;
+ FFTSample *rdft_vdata;
+
+ int dc;
+ char *lum_str;
+ AVExpr *lum_expr;
+ double *lum_data;
+
+} 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 = "1"}, 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 config_props(AVFilterLink *inlink)
+{
+ FFTFILTContext *fftfilt = inlink->dst->priv;
+ int w = inlink->w;
+ int h = inlink->h;
+ int rdft_hbits, rdft_vbits, i, j;
+ double values[VAR_VARS_NB];
+
+ /* RDFT - Array initialization for Horizontal pass*/
+ for (rdft_hbits = 1; 1 << rdft_hbits < w; rdft_hbits++);
+ fftfilt->rdft_hbits = rdft_hbits;
+ fftfilt->rdft_hlen = 1 << rdft_hbits;
+ if (!(fftfilt->rdft_hdata = av_malloc_array(h, fftfilt->rdft_hlen * sizeof(FFTSample))))
+ return AVERROR(ENOMEM);
+
+ /* RDFT - Array initialization for Vertical pass*/
+ for (rdft_vbits = 1; 1 << rdft_vbits < h; rdft_vbits++);
+ fftfilt->rdft_vbits = rdft_vbits;
+ fftfilt->rdft_vlen = 1 << rdft_vbits;
+ if (!(fftfilt->rdft_vdata = av_malloc_array(fftfilt->rdft_hlen, fftfilt->rdft_vlen * sizeof(FFTSample))))
+ return AVERROR(ENOMEM);
+
+ /*Luminance value - Array initialization*/
+ if(!(fftfilt->lum_data = av_malloc_array(fftfilt->rdft_hlen, fftfilt->rdft_vlen * sizeof(double))))
+ return AVERROR(ENOMEM);
+ values[VAR_W] = w;
+ values[VAR_H] = h;
+ for (i = 0; i < fftfilt->rdft_hlen; i++)
+ {
+ values[VAR_X] = i;
+ for (j = 0; j < fftfilt->rdft_vlen; j++)
+ {
+ values[VAR_Y] = j;
+ fftfilt->lum_data[i * fftfilt->rdft_vlen + j] = av_expr_eval(fftfilt->lum_expr, values, fftfilt);
+ }
+ }
+ return 0;
+}
+
+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 w = inlink->w;
+ int h = inlink->h;
+ size_t rdft_hlen = fftfilt->rdft_hlen;
+ size_t rdft_vlen = fftfilt->rdft_vlen;
+ int i, j;
+
+ 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(fftfilt->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(fftfilt->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*/
+ for (i = 0; i < rdft_hlen; i++)
+ for (j = 0; j < rdft_vlen; j++)
+ fftfilt->rdft_vdata[i * rdft_vlen + j] *= fftfilt->lum_data[i * rdft_vlen + j];
+ fftfilt->rdft_vdata[0] += rdft_hlen * rdft_vlen * fftfilt->dc;
+
+ /*Vertical pass - IRDFT*/
+ fftfilt->rdft = av_rdft_init(fftfilt->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(fftfilt->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);
+ av_free(fftfilt->lum_data);
+}
+
+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,
+ .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("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
_______________________________________________
ffmpeg-devel mailing list
[email protected]
http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
