[FFmpeg-cvslog] histogram filter
Paul B Mahol
git at videolan.org
Sat Feb 9 12:56:09 CET 2013
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Fri Dec 21 18:50:13 2012 +0000| [29a92c01148076cb3f90c132615a5c61e5b0f4ea] | committer: Paul B Mahol
histogram filter
Signed-off-by: Paul B Mahol <onemda at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=29a92c01148076cb3f90c132615a5c61e5b0f4ea
---
Changelog | 1 +
doc/filters.texi | 83 +++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 4 +-
libavfilter/vf_histogram.c | 329 ++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 417 insertions(+), 2 deletions(-)
diff --git a/Changelog b/Changelog
index 5ee9200..3d8c8dd 100644
--- a/Changelog
+++ b/Changelog
@@ -13,6 +13,7 @@ version <next>:
- allpass, bass, bandpass, bandreject, biquad, equalizer, highpass, lowpass
and treble audio filter
- improved showspectrum filter, with multichannel support and sox-like colors
+- histogram filter
version 1.1:
diff --git a/doc/filters.texi b/doc/filters.texi
index 1f22f8d..dea39dd 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3098,6 +3098,89 @@ the histogram. Possible values are @code{none}, @code{weak} or
@code{strong}. It defaults to @code{none}.
@end table
+ at section histogram
+
+Compute and draw a color distribution histogram for the input video.
+
+The computed histogram is a representation of distribution of color components
+in an image.
+
+The filter accepts the following named parameters:
+
+ at table @option
+ at item mode
+Set histogram mode.
+
+It accepts the following values:
+ at table @samp
+ at item levels
+standard histogram that display color components distribution in an image.
+Displays color graph for each color component. Shows distribution
+of the Y, U, V, A or G, B, R components, depending on input format,
+in current frame. Bellow each graph is color component scale meter.
+
+ at item color
+chroma values in vectorscope, if brighter more such chroma values are
+distributed in an image.
+Displays chroma values (U/V color placement) in two dimensional graph
+(which is called a vectorscope). It can be used to read of the hue and
+saturation of the current frame. At a same time it is a histogram.
+The whiter a pixel in the vectorscope, the more pixels of the input frame
+correspond to that pixel (that is the more pixels have this chroma value).
+The V component is displayed on the horizontal (X) axis, with the leftmost
+side being V = 0 and the rightmost side being V = 255.
+The U component is displayed on the vertical (Y) axis, with the top
+representing U = 0 and the bottom representing U = 255.
+
+The position of a white pixel in the graph corresponds to the chroma value
+of a pixel of the input clip. So the graph can be used to read of the
+hue (color flavor) and the saturation (the dominance of the hue in the color).
+As the hue of a color changes, it moves around the square. At the center of
+the square, the saturation is zero, which means that the corresponding pixel
+has no color. If you increase the amount of a specific color, while leaving
+the other colors unchanged, the saturation increases, and you move towards
+the edge of the square.
+
+ at item color2
+chroma values in vectorscope, similar as @code{color} but actual chroma values
+are displayed.
+
+ at item waveform
+per row/column luminance graph. In row mode the left side represents luma = 0
+and right side represents luma = 255. In column mode top side represends
+luma = 0 and bottom side represents luma = 255.
+ at end table
+Default value is @code{levels}.
+
+ at item level_height
+Set height of level in @code{levels}. Default value is @code{200}.
+Allowed range is [50, 2048].
+
+ at item scale_height
+Set height of color scale in @code{levels}. Default value is @code{12}.
+Allowed range is [0, 40].
+
+ at item step
+Set step for @code{waveform} mode. Smaller values are useful to find out how much
+of same luminance values across input rows/columns are distributed.
+Default value is @code{10}. Allowed range is [1, 255].
+
+ at item waveform_mode
+Set mode for @code{waveform}. Can be either @code{row}, or @code{column}.
+Default is @code{row}.
+
+ at subsection Examples
+
+ at itemize
+
+ at item
+Calculate and draw histogram:
+ at example
+ffplay -i input -vf histogram
+ at end example
+
+ at end itemize
+
@section hqdn3d
High precision/quality 3d denoise filter. This filter aims to reduce
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 938b183..a9dfc16 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -122,6 +122,7 @@ OBJS-$(CONFIG_GEQ_FILTER) += vf_geq.o
OBJS-$(CONFIG_GRADFUN_FILTER) += vf_gradfun.o
OBJS-$(CONFIG_HFLIP_FILTER) += vf_hflip.o
OBJS-$(CONFIG_HISTEQ_FILTER) += vf_histeq.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 47158f9..0def0b4 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -116,6 +116,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(GRADFUN, gradfun, vf);
REGISTER_FILTER(HFLIP, hflip, vf);
REGISTER_FILTER(HISTEQ, histeq, 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/version.h b/libavfilter/version.h
index f90d3f2..a4ba75a 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -29,8 +29,8 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 3
-#define LIBAVFILTER_VERSION_MINOR 35
-#define LIBAVFILTER_VERSION_MICRO 101
+#define LIBAVFILTER_VERSION_MINOR 36
+#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \
diff --git a/libavfilter/vf_histogram.c b/libavfilter/vf_histogram.c
new file mode 100644
index 0000000..6371bfc
--- /dev/null
+++ b/libavfilter/vf_histogram.c
@@ -0,0 +1,329 @@
+/*
+ * Copyright (c) 2012-2013 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/avassert.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+enum HistogramMode {
+ MODE_LEVELS,
+ MODE_WAVEFORM,
+ MODE_COLOR,
+ MODE_COLOR2,
+ MODE_NB
+};
+
+typedef struct HistogramContext {
+ const AVClass *class; ///< AVClass context for log and options purpose
+ enum HistogramMode mode;
+ unsigned histogram[256];
+ unsigned max_hval;
+ int ncomp;
+ const uint8_t *bg_color;
+ const uint8_t *fg_color;
+ int level_height;
+ int scale_height;
+ int step;
+ int waveform_mode;
+} HistogramContext;
+
+#define OFFSET(x) offsetof(HistogramContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption histogram_options[] = {
+ { "mode", "set histogram mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_LEVELS}, 0, MODE_NB-1, FLAGS, "mode"},
+ { "levels", "standard histogram", 0, AV_OPT_TYPE_CONST, {.i64=MODE_LEVELS}, 0, 0, FLAGS, "mode" },
+ { "waveform", "per row/column luminance graph", 0, AV_OPT_TYPE_CONST, {.i64=MODE_WAVEFORM}, 0, 0, FLAGS, "mode" },
+ { "color", "chroma values in vectorscope", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLOR}, 0, 0, FLAGS, "mode" },
+ { "color2", "chroma values in vectorscope", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLOR2}, 0, 0, FLAGS, "mode" },
+ { "level_height", "set level height", OFFSET(level_height), AV_OPT_TYPE_INT, {.i64=200}, 50, 2048, FLAGS},
+ { "scale_height", "set scale height", OFFSET(scale_height), AV_OPT_TYPE_INT, {.i64=12}, 0, 40, FLAGS},
+ { "step", "set waveform step value", OFFSET(step), AV_OPT_TYPE_INT, {.i64=10}, 1, 255, FLAGS},
+ { "waveform_mode", "set waveform mode", OFFSET(waveform_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "waveform_mode"},
+ { "row", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "waveform_mode" },
+ { "column", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "waveform_mode" },
+ { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(histogram);
+
+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;
+
+ return 0;
+}
+
+static const enum AVPixelFormat color_pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P,
+ AV_PIX_FMT_NONE
+};
+
+static const enum AVPixelFormat levels_pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P,
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP, AV_PIX_FMT_NONE
+};
+
+static int query_formats(AVFilterContext *ctx)
+{
+ HistogramContext *h = ctx->priv;
+ const enum AVPixelFormat *pix_fmts;
+
+ switch (h->mode) {
+ case MODE_LEVELS:
+ pix_fmts = levels_pix_fmts;
+ break;
+ case MODE_WAVEFORM:
+ case MODE_COLOR:
+ case MODE_COLOR2:
+ pix_fmts = color_pix_fmts;
+ break;
+ default:
+ av_assert0(0);
+ }
+
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+
+ return 0;
+}
+
+static const uint8_t black_yuva_color[4] = { 0, 127, 127, 255 };
+static const uint8_t black_gbrp_color[4] = { 0, 0, 0, 255 };
+static const uint8_t white_yuva_color[4] = { 255, 127, 127, 255 };
+static const uint8_t white_gbrp_color[4] = { 255, 255, 255, 255 };
+
+static int config_input(AVFilterLink *inlink)
+{
+ HistogramContext *h = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+
+ h->ncomp = desc->nb_components;
+
+ switch (inlink->format) {
+ case AV_PIX_FMT_GBRP:
+ h->bg_color = black_gbrp_color;
+ h->fg_color = white_gbrp_color;
+ break;
+ default:
+ h->bg_color = black_yuva_color;
+ h->fg_color = white_yuva_color;
+ }
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ HistogramContext *h = ctx->priv;
+
+ switch (h->mode) {
+ case MODE_LEVELS:
+ outlink->w = 256;
+ outlink->h = (h->level_height + h->scale_height) * h->ncomp;
+ break;
+ case MODE_WAVEFORM:
+ if (h->waveform_mode)
+ outlink->h = 256;
+ else
+ outlink->w = 256;
+ break;
+ case MODE_COLOR:
+ case MODE_COLOR2:
+ outlink->h = outlink->w = 256;
+ break;
+ default:
+ av_assert0(0);
+ }
+
+ outlink->sample_aspect_ratio = (AVRational){1,1};
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
+{
+ HistogramContext *h = inlink->dst->priv;
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AVFilterBufferRef *out;
+ const uint8_t *src;
+ uint8_t *dst;
+ int i, j, k, l, ret;
+
+ out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+ if (!out) {
+ avfilter_unref_bufferp(&in);
+ return AVERROR(ENOMEM);
+ }
+
+ out->pts = in->pts;
+ out->pos = in->pos;
+
+ for (k = 0; k < h->ncomp; k++)
+ for (i = 0; i < outlink->h; i++)
+ memset(out->data[k] + i * out->linesize[k], h->bg_color[k], outlink->w);
+
+ switch (h->mode) {
+ case MODE_LEVELS:
+ for (k = 0; k < h->ncomp; k++) {
+ for (i = 0; i < in->video->h; i++) {
+ src = in->data[k] + i * in->linesize[k];
+ for (j = 0; j < in->video->w; j++)
+ h->histogram[src[j]]++;
+ }
+
+ for (i = 0; i < 256; i++)
+ h->max_hval = FFMAX(h->max_hval, h->histogram[i]);
+
+ int start = k * (h->level_height + h->scale_height);
+ for (i = 0; i < outlink->w; i++) {
+ int col_height = h->level_height - (float)h->histogram[i] / h->max_hval * h->level_height;
+
+ for (j = h->level_height - 1; j >= col_height; j--)
+ for (l = 0; l < h->ncomp; l++)
+ out->data[l][(j + start) * out->linesize[l] + i] = h->fg_color[l];
+ for (j = h->level_height + h->scale_height - 1; j >= h->level_height; j--)
+ out->data[k][(j + start) * out->linesize[k] + i] = i;
+ }
+
+ memset(h->histogram, 0, 256 * sizeof(unsigned));
+ h->max_hval = 0;
+ }
+ break;
+ case MODE_WAVEFORM:
+ if (h->waveform_mode) {
+ for (i = 0; i < inlink->w; i++) {
+ for (j = 0; j < inlink->h; j++) {
+ int pos = in->data[0][j * in->linesize[0] + i] * out->linesize[0] + i;
+ unsigned value = out->data[0][pos];
+ value = FFMIN(value + h->step, 255);
+ out->data[0][pos] = value;
+ }
+ }
+ } else {
+ for (i = 0; i < inlink->h; i++) {
+ src = in ->data[0] + i * in ->linesize[0];
+ dst = out->data[0] + i * out->linesize[0];
+ for (j = 0; j < inlink->w; j++) {
+ int pos = src[j];
+ unsigned value = dst[pos];
+ value = FFMIN(value + h->step, 255);
+ dst[pos] = value;
+ }
+ }
+ }
+ break;
+ case MODE_COLOR:
+ for (i = 0; i < inlink->h; i++) {
+ int iw1 = i * in->linesize[1];
+ int iw2 = i * in->linesize[2];
+ for (j = 0; j < inlink->w; j++) {
+ int pos = in->data[1][iw1 + j] * out->linesize[0] + in->data[2][iw2 + j];
+ if (out->data[0][pos] < 255)
+ out->data[0][pos]++;
+ }
+ }
+ for (i = 0; i < 256; i++) {
+ dst = out->data[0] + i * out->linesize[0];
+ for (j = 0; j < 256; j++) {
+ if (!dst[j]) {
+ out->data[1][i * out->linesize[0] + j] = i;
+ out->data[2][i * out->linesize[0] + j] = j;
+ }
+ }
+ }
+ break;
+ case MODE_COLOR2:
+ for (i = 0; i < inlink->h; i++) {
+ int iw1 = i * in->linesize[1];
+ int iw2 = i * in->linesize[2];
+ for (j = 0; j < inlink->w; j++) {
+ int u = in->data[1][iw1 + j];
+ int v = in->data[2][iw2 + j];
+ int pos = u * out->linesize[0] + v;
+ if (!out->data[0][pos])
+ out->data[0][pos] = FFABS(128 - u) + FFABS(128 - v);
+ out->data[1][pos] = u;
+ out->data[2][pos] = v;
+ }
+ }
+ break;
+ default:
+ av_assert0(0);
+ }
+
+ ret = ff_filter_frame(outlink, out);
+ avfilter_unref_bufferp(&in);
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ HistogramContext *h = ctx->priv;
+
+ av_opt_free(h);
+}
+
+static const AVFilterPad inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ .min_perms = AV_PERM_READ,
+ },
+ { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter avfilter_vf_histogram = {
+ .name = "histogram",
+ .description = NULL_IF_CONFIG_SMALL("Compute and draw a histogram."),
+ .priv_size = sizeof(HistogramContext),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = inputs,
+ .outputs = outputs,
+ .priv_class = &histogram_class,
+};
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