Signed-off-by: Paul B Mahol <one...@gmail.com>
---
doc/filters.texi | 11 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_midequalizer.c | 301 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 314 insertions(+)
create mode 100644 libavfilter/vf_midequalizer.c
diff --git a/doc/filters.texi b/doc/filters.texi
index cd8e90e..056ab8d 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -9643,6 +9643,17 @@ Macroblock size. Default @code{16}.
Search parameter. Default @code{7}.
@end table
+@section midequalizer
+
+Apply Midway Image Equalization effect using two video streams.
+
+This filter accepts the following option:
+
+@table @option
+@item planes
+Set which planes to process. Default is @code{15}, which is all available
planes.
+@end table
+
@section minterpolate
Convert the video to specified frame rate using motion interpolation.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 68a94be..c7b40ff 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -219,6 +219,7 @@ OBJS-$(CONFIG_MCDEINT_FILTER) += vf_mcdeint.o
OBJS-$(CONFIG_MERGEPLANES_FILTER) += vf_mergeplanes.o framesync.o
OBJS-$(CONFIG_MESTIMATE_FILTER) += vf_mestimate.o
motion_estimation.o
OBJS-$(CONFIG_METADATA_FILTER) += f_metadata.o
+OBJS-$(CONFIG_MIDEQUALIZER_FILTER) += vf_midequalizer.o framesync.o
OBJS-$(CONFIG_MINTERPOLATE_FILTER) += vf_minterpolate.o
motion_estimation.o
OBJS-$(CONFIG_MPDECIMATE_FILTER) += vf_mpdecimate.o
OBJS-$(CONFIG_NEGATE_FILTER) += vf_lut.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 86941ba..40cf0f4 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -235,6 +235,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(MERGEPLANES, mergeplanes, vf);
REGISTER_FILTER(MESTIMATE, mestimate, vf);
REGISTER_FILTER(METADATA, metadata, vf);
+ REGISTER_FILTER(MIDEQUALIZER, midequalizer, vf);
REGISTER_FILTER(MINTERPOLATE, minterpolate, vf);
REGISTER_FILTER(MPDECIMATE, mpdecimate, vf);
REGISTER_FILTER(NEGATE, negate, vf);
diff --git a/libavfilter/vf_midequalizer.c b/libavfilter/vf_midequalizer.c
new file mode 100644
index 0000000..73e7fd5
--- /dev/null
+++ b/libavfilter/vf_midequalizer.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright (c) 2017 Paul B Mahol
+ *
+ * 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
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+#include "avfilter.h"
+#include "framesync.h"
+
+typedef struct MidEqualizerContext {
+ const AVClass *class;
+ int width[4], height[4];
+ int nb_planes;
+ int planes;
+ float histogram[2][256];
+ unsigned cchange[256];
+ FFFrameSync fs;
+
+ void (*midequalizer)(const uint8_t *in0, const uint8_t *in1,
+ uint8_t *dst,
+ ptrdiff_t linesize1, ptrdiff_t linesize2,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ float *histogram1, float *histogram2,
+ unsigned *cchange);
+} MidEqualizerContext;
+
+#define OFFSET(x) offsetof(MidEqualizerContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption midequalizer_options[] = {
+ { "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0,
0xF, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(midequalizer);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
+ AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
+ AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUV420P,
+ AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
+ AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+ AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
+ AV_PIX_FMT_GRAY8,
+ AV_PIX_FMT_NONE
+ };
+
+ return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+}
+
+static int process_frame(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ MidEqualizerContext *s = fs->opaque;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AVFrame *out, *in0, *in1;
+ int ret;
+
+ if ((ret = ff_framesync_get_frame(&s->fs, 0, &in0, 0)) < 0 ||
+ (ret = ff_framesync_get_frame(&s->fs, 1, &in1, 0)) < 0)
+ return ret;
+
+ if (ctx->is_disabled) {
+ out = av_frame_clone(in0);
+ if (!out)
+ return AVERROR(ENOMEM);
+ } else {
+ int p;
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out)
+ return AVERROR(ENOMEM);
+ av_frame_copy_props(out, in0);
+
+ for (p = 0; p < s->nb_planes; p++) {
+ if (!((1 << p) & s->planes)) {
+ av_image_copy_plane(out->data[p], out->linesize[p],
in0->data[p], in0->linesize[p],
+ s->width[p], s->height[p]);
+ continue;
+ }
+
+ s->midequalizer(in0->data[p], in1->data[p],
+ out->data[p],
+ in0->linesize[p], in1->linesize[p],
+ out->linesize[p],
+ s->width[p], s->height[p],
+ s->histogram[0], s->histogram[1],
+ s->cchange);
+ }
+ }
+ out->pts = av_rescale_q(in0->pts, s->fs.time_base, outlink->time_base);
+
+ return ff_filter_frame(outlink, out);
+}
+
+static void compute_histogram(const uint8_t *src, ptrdiff_t linesize,
+ int w, int h, float *histogram)
+{
+ int y, x;
+
+ memset(histogram, 0, 256 * sizeof(*histogram));
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ histogram[src[x]] += 1;
+ }
+ src += linesize;
+ }
+
+ for (x = 0; x < 256 - 1; x++) {
+ histogram[x + 1] += histogram[x];
+ histogram[x] /= 256;
+ }
+ histogram[x] /= 256;
+}
+
+static void compute_contrast_change(float *histogram1, float *histogram2,
+ unsigned *cchange)
+{
+ int i;
+
+ for (i = 0; i < 256; i++) {
+ int j;
+
+ for (j = 0; j < 256 && histogram2[j] < histogram1[i]; j++);
+
+ cchange[i] = (i + j) / 2;
+ }
+}
+
+static void midequalizer8(const uint8_t *in0, const uint8_t *in1,
+ uint8_t *dst,
+ ptrdiff_t linesize1, ptrdiff_t linesize2,
+ ptrdiff_t dlinesize,
+ int w, int h,
+ float *histogram1, float *histogram2,
+ unsigned *cchange1)
+{
+ int x, y;
+
+ compute_histogram(in0, linesize1, w, h, histogram1);
+ compute_histogram(in1, linesize2, w, h, histogram2);
+
+ compute_contrast_change(histogram1, histogram2, cchange1);
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ dst[x] = av_clip_uint8(cchange1[in0[x]]);
+ }
+ dst += dlinesize;
+ in0 += linesize1;
+ }
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ MidEqualizerContext *s = ctx->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ int vsub, hsub;
+
+ s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+ hsub = desc->log2_chroma_w;
+ vsub = desc->log2_chroma_h;
+ s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
+ s->height[0] = s->height[3] = inlink->h;
+ s->width[1] = s->width[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
+ s->width[0] = s->width[3] = inlink->w;
+
+ s->midequalizer = midequalizer8;
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ MidEqualizerContext *s = ctx->priv;
+ AVFilterLink *in0 = ctx->inputs[0];
+ AVFilterLink *in1 = ctx->inputs[1];
+ FFFrameSyncIn *in;
+ int ret;
+
+ if (in0->format != in1->format) {
+ av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (in0->w != in1->w || in0->h != in1->h) {
+ av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
+ "(size %dx%d) do not match the corresponding "
+ "second input link %s parameters (%dx%d)\n",
+ ctx->input_pads[0].name, in0->w, in0->h,
+ ctx->input_pads[1].name, in1->w, in1->h);
+ return AVERROR(EINVAL);
+ }
+
+ outlink->w = in0->w;
+ outlink->h = in0->h;
+ outlink->time_base = in0->time_base;
+ outlink->sample_aspect_ratio = in0->sample_aspect_ratio;
+ outlink->frame_rate = in0->frame_rate;
+
+ if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
+ return ret;
+
+ in = s->fs.in;
+ in[0].time_base = in0->time_base;
+ in[1].time_base = in1->time_base;
+ in[0].sync = 1;
+ in[0].before = EXT_STOP;
+ in[0].after = EXT_INFINITY;
+ in[1].sync = 1;
+ in[1].before = EXT_STOP;
+ in[1].after = EXT_INFINITY;
+ s->fs.opaque = s;
+ s->fs.on_event = process_frame;
+
+ return ff_framesync_configure(&s->fs);
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
+{
+ MidEqualizerContext *s = inlink->dst->priv;
+ return ff_framesync_filter_frame(&s->fs, inlink, buf);
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ MidEqualizerContext *s = outlink->src->priv;
+ return ff_framesync_request_frame(&s->fs, outlink);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ MidEqualizerContext *s = ctx->priv;
+
+ ff_framesync_uninit(&s->fs);
+}
+
+static const AVFilterPad midequalizer_inputs[] = {
+ {
+ .name = "in0",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ },
+ {
+ .name = "in1",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad midequalizer_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ .request_frame = request_frame,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_midequalizer = {
+ .name = "midequalizer",
+ .description = NULL_IF_CONFIG_SMALL("Apply Midway Equalization."),
+ .priv_size = sizeof(MidEqualizerContext),
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = midequalizer_inputs,
+ .outputs = midequalizer_outputs,
+ .priv_class = &midequalizer_class,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
+};
--
2.9.3
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