[FFmpeg-devel] [PATCH] lavfi: add geq filter.
Clément Bœsch
ubitux at gmail.com
Wed Oct 31 20:40:15 CET 2012
TODO: bump minor
---
Another portage from MPlayer filters. It seems to work, but I still have some
issues with ffplay when the filter is complex/heavy. Try for instance this one
(stolen from a random guy on #mplayer):
ffplay -f lavfi -i 'testsrc,geq=p(lt(X\,W/2)*X*(1+sin(N*PI/100))+not(lt(X\,W/2))*(W-X)*(1+sin(N*PI/100))\,lt(Y\,H/2)*Y*(1+sin(N*PI/100))+not(lt(Y\,H/2))*(H-Y)*(1+sin(N*PI/100)))'
mplayer seems to deal relatively well with slow filters contrary to ffplay, but
I have no idea how to avoid the current frame drop (playing with the options
didn't help).
Except that, the filter seems to work fine.
BTW, I took the complex example from the git log (9e5e086b), but feel free
to propose more fancy/useful equations for the documentation.
About FATE, given the amount of floating operations, I'm not really confident
about adding such test.
Last thing: I'll drop mp=geq soon after this gets applied.
---
Changelog | 1 +
LICENSE | 1 +
configure | 1 +
doc/filters.texi | 53 ++++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_geq.c | 213 +++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 271 insertions(+)
create mode 100644 libavfilter/vf_geq.c
diff --git a/Changelog b/Changelog
index 8f6c90b..ccc2fdc 100644
--- a/Changelog
+++ b/Changelog
@@ -19,6 +19,7 @@ version <next>:
- ffescape tool
- metadata (info chunk) support in CAF muxer
- field filter ported from libmpcodecs
+- geq filter ported from libmpcodecs
version 1.0:
diff --git a/LICENSE b/LICENSE
index f38fc16..a1204f4 100644
--- a/LICENSE
+++ b/LICENSE
@@ -30,6 +30,7 @@ Specifically, the GPL parts of FFmpeg are
- vf_cropdetect.c
- vf_decimate.c
- vf_delogo.c
+ - vf_geq.c
- vf_hqdn3d.c
- vf_hue.c
- vf_mp.c
diff --git a/configure b/configure
index dc1aa79..2c16f82 100755
--- a/configure
+++ b/configure
@@ -1939,6 +1939,7 @@ frei0r_filter_deps="frei0r dlopen"
frei0r_filter_extralibs='$ldl'
frei0r_src_filter_deps="frei0r dlopen"
frei0r_src_filter_extralibs='$ldl'
+geq_filter_deps="gpl"
hqdn3d_filter_deps="gpl"
hue_filter_deps="gpl"
movie_filter_deps="avcodec avformat"
diff --git a/doc/filters.texi b/doc/filters.texi
index 786b2db..1cba190 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2310,6 +2310,59 @@ frei0r=perspective:0.2/0.2:0.8/0.2
For more information see:
@url{http://frei0r.dyne.org}
+ at section geq
+
+The filter takes one, two or three equations as parameter, separated by ':'.
+The first equation is mandatory and applies to the luma plane. The two
+following are respectively for chroma blue and chroma red planes. If one
+equation is not specified, it is using the same as the previous one.
+
+The expressions can use the following variables:
+
+ at table @option
+ at item X, Y
+The coordinates of the current sample
+
+ at item W, H
+The width and height of the image
+
+ at item SW, SH
+Width and height scale depending on the currently filtered plane, e.g. 1,1 and
+0.5,0.5 for YUV 4:2:0.
+
+ at item p(x, y)
+Return the value of the pixel at location (@var{x};@var{y}) of the current
+plane.
+
+ at item lum(x, y)
+Return the value of the pixel at location (@var{x};@var{y}) of the luminance
+plane.
+
+ at item cb(x, y)
+Return the value of the pixel at location (@var{x};@var{y}) of the
+blue-difference chroma plane.
+
+ at item cr(x, y)
+Return the value of the pixel at location (@var{x};@var{y}) of the
+red-difference chroma plane.
+ at end table
+
+Some examples follow:
+
+ at itemize
+ at item
+Flip the image horizontally:
+ at example
+geq=p(W-X\,Y)
+ at end example
+
+ at item
+Fancy enigmatic moving light:
+ at example
+color=s=256x256,geq=random(1)/hypot(X-cos(N*0.07)*W/2-W/2\,Y-sin(N*0.09)*H/2-H/2)^2*1000000*sin(N*0.02):128:128
+ at end example
+ at end itemize
+
@section gradfun
Fix the banding artifacts that are sometimes introduced into nearly flat
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 0ab0633..dfd5200 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -105,6 +105,7 @@ OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
OBJS-$(CONFIG_FRAMESTEP_FILTER) += vf_framestep.o
OBJS-$(CONFIG_FPS_FILTER) += vf_fps.o
OBJS-$(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_HQDN3D_FILTER) += vf_hqdn3d.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index fef40e9..88e8d68 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -97,6 +97,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (FPS, fps, vf);
REGISTER_FILTER (FRAMESTEP, framestep, vf);
REGISTER_FILTER (FREI0R, frei0r, vf);
+ REGISTER_FILTER (GEQ, geq, vf);
REGISTER_FILTER (GRADFUN, gradfun, vf);
REGISTER_FILTER (HFLIP, hflip, vf);
REGISTER_FILTER (HQDN3D, hqdn3d, vf);
diff --git a/libavfilter/vf_geq.c b/libavfilter/vf_geq.c
new file mode 100644
index 0000000..2080dfa
--- /dev/null
+++ b/libavfilter/vf_geq.c
@@ -0,0 +1,213 @@
+/*
+ * Copyright (C) 2006 Michael Niedermayer <michaelni at gmx.at>
+ * Copyright (C) 2012 Clément Bœsch <ubitux at gmail.com>
+ *
+ * This file is part of MPlayer.
+ *
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with MPlayer; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * @file
+ * Generic equation change filter
+ * Originally written by Michael Niedermayer for the MPlayer project, and
+ * ported by Clément Bœsch for FFmpeg.
+ */
+
+#include "libavcodec/avcodec.h"
+#include "libavutil/eval.h"
+#include "libavutil/avstring.h"
+#include "libavutil/pixdesc.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct {
+ AVExpr *e[3]; ///< expressions for each plane
+ int framenum; ///< frame counter
+ AVFilterBufferRef *picref; ///< current input buffer
+ int hsub, vsub;
+} GEQContext;
+
+static inline double getpix(void *priv, double x, double y, int plane)
+{
+ int xi, yi;
+ GEQContext *geq = priv;
+ AVFilterBufferRef *picref = geq->picref;
+ const uint8_t *src = picref->data[plane];
+ const int linesize = picref->linesize[plane];
+ const int w = picref->video->w >> (plane ? geq->hsub : 0);
+ const int h = picref->video->h >> (plane ? geq->vsub : 0);
+
+ xi = x = FFMIN(FFMAX(x, 0), w - 1);
+ yi = y = FFMIN(FFMAX(y, 0), h - 1);
+
+ x -= xi;
+ y -= yi;
+
+ return (1-y)*((1-x)*src[xi + yi * linesize] + x*src[xi + 1 + yi * linesize])
+ + y *((1-x)*src[xi + (yi+1) * linesize] + x*src[xi + 1 + (yi+1) * linesize]);
+}
+
+//TODO: cubic interpolate
+//TODO: keep the last few frames
+static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); }
+static double cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); }
+static double cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); }
+
+static const char *const var_names[] = { "X", "Y", "W", "H", "N", "SW", "SH", NULL };
+enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_VARS_NB };
+
+static av_cold int geq_init(AVFilterContext *ctx, const char *args)
+{
+ GEQContext *geq = ctx->priv;
+ char *args1 = av_strdup(args);
+ char *bufptr = NULL;
+ char *arg = args1;
+ const char *expr[3] = {0};
+ int plane, ret = 0;
+
+ if (!args1) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+
+ for (plane = 0; plane < 3; plane++, arg = NULL) {
+ static double (*p[])(void *, double, double) = { lum, cb, cr };
+ static const char *const func2_names[] = { "lum", "cb", "cr", "p", NULL };
+ double (*func2[])(void *, double, double) = { lum, cb, cr, p[plane], NULL };
+
+ expr[plane] = av_strtok(arg, ":", &bufptr);
+ if (!expr[plane]) {
+ if (plane == 0) {
+ av_log(ctx, AV_LOG_ERROR, "At least one expression must be specified\n");
+ ret = AVERROR(EINVAL);
+ goto end;
+ }
+ expr[plane] = expr[plane - 1];
+ }
+ ret = av_expr_parse(&geq->e[plane], expr[plane], var_names, NULL, NULL,
+ func2_names, func2, 0, ctx);
+ if (ret < 0)
+ goto end;
+ }
+
+end:
+ av_free(args1);
+ return ret;
+}
+
+static int geq_query_formats(AVFilterContext *ctx)
+{
+ static const enum PixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
+ AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
+ AV_PIX_FMT_YUVA420P,
+ AV_PIX_FMT_NONE
+ };
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+ return 0;
+}
+
+static int geq_config_props(AVFilterLink *inlink)
+{
+ GEQContext *geq = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+
+ geq->hsub = desc->log2_chroma_w;
+ geq->vsub = desc->log2_chroma_h;
+ return 0;
+}
+
+static int geq_end_frame(AVFilterLink *inlink)
+{
+ int ret, plane;
+ GEQContext *geq = inlink->dst->priv;
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ AVFilterBufferRef *outpicref = outlink->out_buf;
+ double values[VAR_VARS_NB] = {
+ [VAR_N] = geq->framenum++,
+ };
+
+ geq->picref = inlink->cur_buf;
+
+ for (plane = 0; plane < 3; plane++) {
+ int x, y;
+ uint8_t *dst = outpicref->data[plane];
+ const int linesize = outpicref->linesize[plane];
+ const int w = inlink->w >> (plane ? geq->hsub : 0);
+ const int h = inlink->h >> (plane ? geq->vsub : 0);
+
+ values[VAR_W] = w;
+ values[VAR_H] = h;
+ values[VAR_SW] = w / (double)inlink->w;
+ values[VAR_SH] = h / (double)inlink->h;
+
+ for (y = 0; y < h; y++) {
+ values[VAR_Y] = y;
+ for (x = 0; x < w; x++) {
+ values[VAR_X] = x;
+ dst[x] = av_expr_eval(geq->e[plane], values, geq);
+ }
+ dst += linesize;
+ }
+ }
+
+ if ((ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0 ||
+ (ret = ff_end_frame(outlink)) < 0)
+ return ret;
+ return 0;
+}
+
+static av_cold void geq_uninit(AVFilterContext *ctx)
+{
+ int i;
+ GEQContext *geq = ctx->priv;
+
+ for (i = 0; i < FF_ARRAY_ELEMS(geq->e); i++)
+ av_expr_free(geq->e[i]);
+}
+
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
+
+static const AVFilterPad avfilter_vf_geq_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .draw_slice = null_draw_slice,
+ .config_props = geq_config_props,
+ .end_frame = geq_end_frame,
+ .min_perms = AV_PERM_READ,
+ },
+ { NULL }
+};
+
+static const AVFilterPad avfilter_vf_geq_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter avfilter_vf_geq = {
+ .name = "geq",
+ .description = NULL_IF_CONFIG_SMALL("Generic equation change filter"),
+ .priv_size = sizeof(GEQContext),
+ .init = geq_init,
+ .uninit = geq_uninit,
+ .query_formats = geq_query_formats,
+ .inputs = avfilter_vf_geq_inputs,
+ .outputs = avfilter_vf_geq_outputs,
+};
--
1.8.0
More information about the ffmpeg-devel
mailing list