[FFmpeg-devel] [RFC] [PATCH] histogram filter
Paul B Mahol
onemda at gmail.com
Wed Dec 26 14:29:29 CET 2012
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_histogram.c | 276 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 278 insertions(+)
create mode 100644 libavfilter/vf_histogram.c
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 7595e4c..2b4cde8 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -109,6 +109,7 @@ OBJS-$(CONFIG_FREI0R_FILTER) += vf_frei0r.o
OBJS-$(CONFIG_GEQ_FILTER) += vf_geq.o
OBJS-$(CONFIG_GRADFUN_FILTER) += vf_gradfun.o
OBJS-$(CONFIG_HFLIP_FILTER) += vf_hflip.o
+OBJS-$(CONFIG_HISTOGRAM_FILTER) += vf_histogram.o
OBJS-$(CONFIG_HQDN3D_FILTER) += vf_hqdn3d.o
OBJS-$(CONFIG_HUE_FILTER) += vf_hue.o
OBJS-$(CONFIG_IDET_FILTER) += vf_idet.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 88b0979..94b1aa1 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -100,6 +100,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (GEQ, geq, vf);
REGISTER_FILTER (GRADFUN, gradfun, vf);
REGISTER_FILTER (HFLIP, hflip, vf);
+ REGISTER_FILTER (HISTOGRAM, histogram, vf);
REGISTER_FILTER (HQDN3D, hqdn3d, vf);
REGISTER_FILTER (HUE, hue, vf);
REGISTER_FILTER (IDET, idet, vf);
diff --git a/libavfilter/vf_histogram.c b/libavfilter/vf_histogram.c
new file mode 100644
index 0000000..a7e4781
--- /dev/null
+++ b/libavfilter/vf_histogram.c
@@ -0,0 +1,276 @@
+/*
+ * Copyright (c) 2012 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/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "drawutils.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct {
+ const AVClass *class; ///< AVClass context for log and options purpose
+ unsigned histogram[1 << 16];
+ unsigned histogram_size;
+ unsigned max_hval;
+ int comp_yuv[4];
+ int comp_rgb[4];
+ int ncomp;
+ int do_graph;
+ int w, h;
+ AVFilterBufferRef *outpicref; ///< output picture reference, updated regularly
+ FFDrawContext draw;
+ char *fg_color_str, *bg_color_str;
+ uint8_t fg_color_rgba[4], bg_color_rgba[4];
+} HistogramContext;
+
+static int config_input(AVFilterLink *link)
+{
+ HistogramContext *h = link->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
+
+ h->histogram_size = 1 << desc->comp[0].depth_minus1 + 1;
+ h->ncomp = desc->nb_components;
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *link, AVFilterBufferRef *in)
+{
+ HistogramContext *h = link->dst->priv;
+ AVFilterContext *ctx = link->dst;
+ const uint8_t *src;
+ int i, j, k;
+
+ switch (in->format) {
+ case AV_PIX_FMT_RGB24:
+ case AV_PIX_FMT_RGBA:
+ src = in->data[0];
+ for (i = 0; i < in->video->h; i++) {
+ for (j = 0; j < in->linesize[0]; j += h->ncomp) {
+ unsigned v = 0, used = 0;
+
+ for (k = 0; k < h->ncomp; k++) {
+ if (h->comp_rgb[k]) {
+ v += src[j + k];
+ used++;
+ }
+ }
+
+ if (used)
+ h->histogram[v / used]++;
+ }
+ src += in->linesize[0];
+ }
+ break;
+ case AV_PIX_FMT_YUVA444P:
+ case AV_PIX_FMT_YUV444P:
+ case AV_PIX_FMT_YUVJ444P:
+ case AV_PIX_FMT_GRAY8:
+ case AV_PIX_FMT_GRAY8A:
+ for (i = 0; i < in->video->h; i++) {
+ for (j = 0; j < in->linesize[0]; j++) {
+ unsigned v = 0, used = 0;
+
+ for (k = 0; k < h->ncomp; k++) {
+ if (h->comp_yuv[k]) {
+ src = in->data[k] + i * in->linesize[k];
+ v += src[j];
+ used++;
+ }
+ }
+
+ if (used)
+ h->histogram[v / used]++;
+ }
+ }
+ break;
+ }
+
+ for (i = 0; i < h->histogram_size; i++) {
+ h->max_hval = FFMAX(h->max_hval, h->histogram[i]);
+ if (h->histogram[i])
+ av_log(ctx, h->do_graph ? AV_LOG_VERBOSE : AV_LOG_INFO, "i:%d c:%d\n", i, h->histogram[i]);
+ }
+
+ if (h->do_graph) {
+ AVFilterBufferRef *out = h->outpicref;
+ FFDrawColor bg, fg;
+ int ret, col_width = h->w / h->histogram_size;
+
+ out->pts = in->pts;
+ out->pos = in->pos;
+
+ ff_draw_color(&h->draw, &bg, h->bg_color_rgba);
+ ff_draw_color(&h->draw, &fg, h->fg_color_rgba);
+ ff_fill_rectangle(&h->draw, &bg, out->data, out->linesize, 0, 0, h->w, h->h);
+ for (i = 0; i < h->histogram_size; i++) {
+ int col_height = (float) h->histogram[i] / h->max_hval * h->h;
+
+ ff_fill_rectangle(&h->draw, &fg, out->data, out->linesize,
+ i * col_width,
+ h->h - col_height,
+ col_width,
+ col_height);
+ }
+
+ ret = ff_filter_frame(ctx->outputs[0], avfilter_ref_buffer(out, ~AV_PERM_WRITE));
+ if (ret < 0)
+ return ret;
+ } else {
+ ff_filter_frame(link->dst->outputs[0], in);
+ }
+ memset(h->histogram, 0, h->histogram_size * sizeof(*h->histogram));
+ h->max_hval = 0;
+ avfilter_unref_buffer(in);
+
+ return 0;
+}
+
+#define Y 0
+#define U 1
+#define V 2
+#define R 0
+#define G 1
+#define B 2
+#define A 3
+
+#define OFFSET(x) offsetof(HistogramContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption histogram_options[] = {
+ { "graph", "show histogram graph", OFFSET(do_graph), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
+ { "size", "set histogram graph video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "256x200"}, 0, 0, FLAGS },
+ { "fg", "set histogram foreground color", OFFSET(fg_color_str), AV_OPT_TYPE_STRING, {.str = "white"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "bg", "set histogram background color", OFFSET(bg_color_str), AV_OPT_TYPE_STRING, {.str = "black"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "y", "use Y component", OFFSET(comp_yuv[Y]), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
+ { "u", "use U component", OFFSET(comp_yuv[U]), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+ { "v", "use V component", OFFSET(comp_yuv[V]), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+ { "a", "use A component", OFFSET(comp_yuv[A]), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
+ { "r", "use R component", OFFSET(comp_rgb[R]), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
+ { "g", "use G component", OFFSET(comp_rgb[G]), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
+ { "b", "use B component", OFFSET(comp_rgb[B]), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
+ { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(histogram);
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ HistogramContext *h = ctx->priv;
+
+ if (!h->do_graph)
+ return 0;
+
+ outlink->w = h->w;
+ outlink->h = h->h;
+
+ avfilter_unref_bufferp(&h->outpicref);
+ h->outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_PRESERVE|AV_PERM_REUSE2,
+ outlink->w, outlink->h);
+ if (!h->outpicref)
+ return AVERROR(ENOMEM);
+ outlink->sample_aspect_ratio = (AVRational){1,1};
+
+ ff_draw_init(&h->draw, outlink->format, 0);
+
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+ HistogramContext *h = ctx->priv;
+ int ret;
+
+ h->class = &histogram_class;
+ av_opt_set_defaults(h);
+
+ if ((ret = (av_set_options_string(h, args, "=", ":"))) < 0)
+ return ret;
+
+ if ((ret = av_parse_color(h->fg_color_rgba, h->fg_color_str, -1, ctx)) < 0 ||
+ (ret = av_parse_color(h->bg_color_rgba, h->bg_color_str, -1, ctx)) < 0 )
+ return ret;
+
+ h->comp_rgb[A] = h->comp_yuv[A];
+ if (!h->comp_rgb[R] && !h->comp_rgb[G] && !h->comp_rgb[B] && !h->comp_rgb[A] &&
+ !h->comp_yuv[Y] && !h->comp_yuv[U] && !h->comp_yuv[V] && !h->comp_yuv[A])
+ return AVERROR(EINVAL);
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ HistogramContext *h = ctx->priv;
+
+ avfilter_unref_bufferp(&h->outpicref);
+ av_opt_free(h);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P,
+ AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
+ AV_PIX_FMT_NONE
+ };
+
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+
+ return 0;
+}
+
+static const AVFilterPad histogram_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = ff_null_get_video_buffer,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ .min_perms = AV_PERM_READ,
+ },
+ { NULL }
+};
+
+static const AVFilterPad histogram_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter avfilter_vf_histogram = {
+ .name = "histogram",
+ .description = NULL_IF_CONFIG_SMALL("Histogram."),
+ .priv_size = sizeof(HistogramContext),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = histogram_inputs,
+ .outputs = histogram_outputs,
+ .priv_class = &histogram_class,
+};
--
1.7.11.4
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