[FFmpeg-cvslog] lavfi: port boxblur filter from libmpcodecs
Stefano Sabatini
git at videolan.org
Thu Jul 14 00:06:57 CEST 2011
ffmpeg | branch: master | Stefano Sabatini <stefano.sabatini-lala at poste.it> | Sat Jul 9 18:13:10 2011 +0200| [6b61920ab76dc6d85ef462909951923935dd643f] | committer: Stefano Sabatini
lavfi: port boxblur filter from libmpcodecs
With the following additions:
* support to gray format
* support to yuva420p format
* parametric luma/chroma/alpha radius
* consistency check on the radius values, avoid crashes with invalid values
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6b61920ab76dc6d85ef462909951923935dd643f
---
Changelog | 1 +
configure | 1 +
doc/filters.texi | 60 ++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/avfilter.h | 4 +-
libavfilter/vf_boxblur.c | 350 ++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 416 insertions(+), 2 deletions(-)
diff --git a/Changelog b/Changelog
index 3ba34c3..f1d5654 100644
--- a/Changelog
+++ b/Changelog
@@ -4,6 +4,7 @@ releases are sorted from youngest to oldest.
version next:
- openal input device added
+- boxblur filter added
version 0.8:
diff --git a/configure b/configure
index f62db07..ee8180f 100755
--- a/configure
+++ b/configure
@@ -1497,6 +1497,7 @@ udp_protocol_deps="network"
# filters
blackframe_filter_deps="gpl"
+boxblur_filter_deps="gpl"
cropdetect_filter_deps="gpl"
drawtext_filter_deps="libfreetype"
frei0r_filter_deps="frei0r dlopen strtok_r"
diff --git a/doc/filters.texi b/doc/filters.texi
index 2ac4231..2c8d6e7 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -183,6 +183,66 @@ threshold, and defaults to 98.
@var{threshold} is the threshold below which a pixel value is
considered black, and defaults to 32.
+ at section boxblur
+
+Apply boxblur algorithm to the input video.
+
+This filter accepts the parameters:
+ at var{luma_power}:@var{luma_radius}:@var{chroma_radius}:@var{chroma_power}:@var{alpha_radius}:@var{alpha_power}
+
+Chroma and alpha parameters are optional, if not specified they default
+to the corresponding values set for @var{luma_radius} and
+ at var{luma_power}.
+
+ at var{luma_radius}, @var{chroma_radius}, and @var{alpha_radius} represent
+the radius in pixels of the box used for blurring the corresponding
+input plane. They are expressions, and can contain the following
+constants:
+ at table @option
+ at item w, h
+the input width and heigth in pixels
+
+ at item cw, ch
+the input chroma image width and height in pixels
+
+ at item hsub, vsub
+horizontal and vertical chroma subsample values. For example for the
+pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
+ at end table
+
+The radius must be a non-negative number, and must be not greater than
+the value of the expression @code{min(w,h)/2} for the luma and alpha planes,
+and of @code{min(cw,ch)/2} for the chroma planes.
+
+ at var{luma_power}, @var{chroma_power}, and @var{alpha_power} represent
+how many times the boxblur filter is applied to the corresponding
+plane.
+
+Some examples follow:
+
+ at itemize
+
+ at item
+Apply a boxblur filter with luma, chroma, and alpha radius
+set to 2:
+ at example
+boxblur=2:1
+ at end example
+
+ at item
+Set luma radius to 2, alpha and chroma radius to 0
+ at example
+boxblur=2:1:0:0:0:0
+ at end example
+
+ at item
+Set luma and chroma radius to a fraction of the video dimension
+ at example
+boxblur=min(h\,w)/10:1:min(cw\,ch)/10:1
+ at end example
+
+ at end itemize
+
@section copy
Copy the input source unchanged to the output. Mainly useful for
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index a8233fd..e29fe5e 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -25,6 +25,7 @@ OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
+OBJS-$(CONFIG_BOXBLUR_FILTER) += vf_boxblur.o
OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
OBJS-$(CONFIG_CROPDETECT_FILTER) += vf_cropdetect.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index feae239..8d80957 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -41,6 +41,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (ANULLSINK, anullsink, asink);
REGISTER_FILTER (BLACKFRAME, blackframe, vf);
+ REGISTER_FILTER (BOXBLUR, boxblur, vf);
REGISTER_FILTER (COPY, copy, vf);
REGISTER_FILTER (CROP, crop, vf);
REGISTER_FILTER (CROPDETECT, cropdetect, vf);
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 362bbfe..3e1acea 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -29,8 +29,8 @@
#include "libavutil/rational.h"
#define LIBAVFILTER_VERSION_MAJOR 2
-#define LIBAVFILTER_VERSION_MINOR 24
-#define LIBAVFILTER_VERSION_MICRO 4
+#define LIBAVFILTER_VERSION_MINOR 25
+#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \
diff --git a/libavfilter/vf_boxblur.c b/libavfilter/vf_boxblur.c
new file mode 100644
index 0000000..7fb1ec5
--- /dev/null
+++ b/libavfilter/vf_boxblur.c
@@ -0,0 +1,350 @@
+/*
+ * Copyright (c) 2002 Michael Niedermayer <michaelni at gmx.at>
+ * Copyright (c) 2011 Stefano Sabatini
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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
+ * Apply a boxblur filter to the input video.
+ * Ported from MPlayer libmpcodecs/vf_boxblur.c.
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/eval.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+
+static const char *var_names[] = {
+ "w",
+ "h",
+ "cw",
+ "ch",
+ "hsub",
+ "vsub",
+ NULL
+};
+
+enum var_name {
+ VAR_W,
+ VAR_H,
+ VAR_CW,
+ VAR_CH,
+ VAR_HSUB,
+ VAR_VSUB,
+ VARS_NB
+};
+
+typedef struct {
+ int radius;
+ int power;
+} FilterParam;
+
+typedef struct {
+ FilterParam luma_param;
+ FilterParam chroma_param;
+ FilterParam alpha_param;
+ char luma_radius_expr [256];
+ char chroma_radius_expr[256];
+ char alpha_radius_expr [256];
+
+ int hsub, vsub;
+ int radius[4];
+ int power[4];
+ uint8_t *temp[2]; ///< temporary buffer used in blur_power()
+} BoxBlurContext;
+
+#define Y 0
+#define U 1
+#define V 2
+#define A 3
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ BoxBlurContext *boxblur = ctx->priv;
+ int e;
+
+ if (!args) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Filter expects 2 or 4 arguments, none provided\n");
+ return AVERROR(EINVAL);
+ }
+
+ e = sscanf(args, "%255[^:]:%d:%255[^:]:%d:%255[^:]:%d",
+ boxblur->luma_radius_expr, &boxblur->luma_param .power,
+ boxblur->chroma_radius_expr, &boxblur->chroma_param.power,
+ boxblur->alpha_radius_expr, &boxblur->alpha_param .power);
+
+ if (e != 2 && e != 4 && e != 6) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Filter expects 2 or 4 or 6 params, provided %d\n", e);
+ return AVERROR(EINVAL);
+ }
+
+ if (e < 4) {
+ boxblur->chroma_param.power = boxblur->luma_param.power;
+ av_strlcpy(boxblur->chroma_radius_expr, boxblur->luma_radius_expr,
+ sizeof(boxblur->chroma_radius_expr));
+ }
+ if (e < 6) {
+ boxblur->alpha_param.power = boxblur->luma_param.power;
+ av_strlcpy(boxblur->alpha_radius_expr, boxblur->luma_radius_expr,
+ sizeof(boxblur->alpha_radius_expr));
+ }
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ BoxBlurContext *boxblur = ctx->priv;
+
+ av_freep(&boxblur->temp[0]);
+ av_freep(&boxblur->temp[1]);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ enum PixelFormat pix_fmts[] = {
+ PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
+ PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUVA420P,
+ PIX_FMT_YUV440P, PIX_FMT_GRAY8,
+ PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
+ PIX_FMT_YUVJ440P,
+ PIX_FMT_NONE
+ };
+
+ avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ BoxBlurContext *boxblur = ctx->priv;
+ const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];
+ int w = inlink->w, h = inlink->h;
+ int cw, ch;
+ double var_values[VARS_NB], res;
+ char *expr;
+ int ret;
+
+ if (!(boxblur->temp[0] = av_malloc(w)) ||
+ !(boxblur->temp[1] = av_malloc(w)))
+ return AVERROR(ENOMEM);
+
+ boxblur->hsub = desc->log2_chroma_w;
+ boxblur->vsub = desc->log2_chroma_h;
+
+ var_values[VAR_W] = inlink->w;
+ var_values[VAR_H] = inlink->h;
+ var_values[VAR_CW] = cw = w>>boxblur->hsub;
+ var_values[VAR_CH] = ch = h>>boxblur->vsub;
+ var_values[VAR_HSUB] = 1<<boxblur->hsub;
+ var_values[VAR_VSUB] = 1<<boxblur->vsub;
+
+#define EVAL_RADIUS_EXPR(comp) \
+ expr = boxblur->comp##_radius_expr; \
+ ret = av_expr_parse_and_eval(&res, expr, var_names, var_values, \
+ NULL, NULL, NULL, NULL, NULL, 0, ctx); \
+ boxblur->comp##_param.radius = res; \
+ if (ret < 0) { \
+ av_log(NULL, AV_LOG_ERROR, \
+ "Error when evaluating " #comp " radius expression '%s'\n", expr); \
+ return ret; \
+ }
+ EVAL_RADIUS_EXPR(luma);
+ EVAL_RADIUS_EXPR(chroma);
+ EVAL_RADIUS_EXPR(alpha);
+
+ av_log(ctx, AV_LOG_INFO,
+ "luma_radius:%d luma_power:%d "
+ "chroma_radius:%d chroma_power:%d "
+ "alpha_radius:%d alpha_power:%d "
+ "w:%d chroma_w:%d h:%d chroma_h:%d\n",
+ boxblur->luma_param .radius, boxblur->luma_param .power,
+ boxblur->chroma_param.radius, boxblur->chroma_param.power,
+ boxblur->alpha_param .radius, boxblur->alpha_param .power,
+ w, cw, h, ch);
+
+#define CHECK_RADIUS_VAL(w_, h_, comp) \
+ if (boxblur->comp##_param.radius < 0 || \
+ 2*boxblur->comp##_param.radius > FFMIN(w_, h_)) { \
+ av_log(ctx, AV_LOG_ERROR, \
+ "Invalid " #comp " radius value %d, must be >= 0 and <= %d\n", \
+ boxblur->comp##_param.radius, FFMIN(w_, h_)/2); \
+ return AVERROR(EINVAL); \
+ }
+ CHECK_RADIUS_VAL(w, h, luma);
+ CHECK_RADIUS_VAL(cw, ch, chroma);
+ CHECK_RADIUS_VAL(w, h, alpha);
+
+ boxblur->radius[Y] = boxblur->luma_param.radius;
+ boxblur->radius[U] = boxblur->radius[V] = boxblur->chroma_param.radius;
+ boxblur->radius[A] = boxblur->alpha_param.radius;
+
+ boxblur->power[Y] = boxblur->luma_param.power;
+ boxblur->power[U] = boxblur->power[V] = boxblur->chroma_param.power;
+ boxblur->power[A] = boxblur->alpha_param.power;
+
+ return 0;
+}
+
+static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
+ int w, int radius)
+{
+ /* Naive boxblur would sum source pixels from x-radius .. x+radius
+ * for destination pixel x. That would be O(radius*width).
+ * If you now look at what source pixels represent 2 consecutive
+ * output pixels, then you see they are almost identical and only
+ * differ by 2 pixels, like:
+ * src0 111111111
+ * dst0 1
+ * src1 111111111
+ * dst1 1
+ * src0-src1 1 -1
+ * so when you know one output pixel you can find the next by just adding
+ * and subtracting 1 input pixel.
+ * The following code adopts this faster variant.
+ */
+ int x, sum = 0;
+ const int length = radius*2 + 1;
+ const int inv = ((1<<16) + length/2)/length;
+
+ for (x = 0; x < radius; x++)
+ sum += src[x*src_step]<<1;
+ sum += src[radius*src_step];
+
+ for (x = 0; x <= radius; x++) {
+ sum += src[(radius+x)*src_step] - src[(radius-x)*src_step];
+ dst[x*dst_step] = (sum*inv + (1<<15))>>16;
+ }
+
+ for (; x < w-radius; x++) {
+ sum += src[(radius+x)*src_step] - src[(x-radius-1)*src_step];
+ dst[x*dst_step] = (sum*inv + (1<<15))>>16;
+ }
+
+ for (; x < w; x++) {
+ sum += src[(2*w-radius-x-1)*src_step] - src[(x-radius-1)*src_step];
+ dst[x*dst_step] = (sum*inv + (1<<15))>>16;
+ }
+}
+
+static inline void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
+ int w, int radius, int power, uint8_t *temp[2])
+{
+ uint8_t *a = temp[0], *b = temp[1];
+
+ if (radius && power) {
+ blur(a, 1, src, src_step, w, radius);
+ for (; power > 2; power--) {
+ uint8_t *c;
+ blur(b, 1, a, 1, w, radius);
+ c = a; a = b; b = c;
+ }
+ if (power > 1) {
+ blur(dst, dst_step, a, 1, w, radius);
+ } else {
+ int i;
+ for (i = 0; i < w; i++)
+ dst[i*dst_step] = a[i];
+ }
+ } else {
+ int i;
+ for (i = 0; i < w; i++)
+ dst[i*dst_step] = src[i*src_step];
+ }
+}
+
+static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
+ int w, int h, int radius, int power, uint8_t *temp[2])
+{
+ int y;
+
+ if (radius == 0 && dst == src)
+ return;
+
+ for (y = 0; y < h; y++)
+ blur_power(dst + y*dst_linesize, 1, src + y*src_linesize, 1,
+ w, radius, power, temp);
+}
+
+static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
+ int w, int h, int radius, int power, uint8_t *temp[2])
+{
+ int x;
+
+ if (radius == 0 && dst == src)
+ return;
+
+ for (x = 0; x < w; x++)
+ blur_power(dst + x, dst_linesize, src + x, src_linesize,
+ h, radius, power, temp);
+}
+
+static void draw_slice(AVFilterLink *inlink, int y0, int h0, int slice_dir)
+{
+ AVFilterContext *ctx = inlink->dst;
+ BoxBlurContext *boxblur = ctx->priv;
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ AVFilterBufferRef *inpicref = inlink ->cur_buf;
+ AVFilterBufferRef *outpicref = outlink->out_buf;
+ int plane;
+ int cw = inlink->w >> boxblur->hsub, ch = h0 >> boxblur->vsub;
+ int w[4] = { inlink->w, cw, cw, inlink->w };
+ int h[4] = { h0, ch, ch, h0 };
+ uint8_t *dst[4], *src[4];
+
+ for (plane = 0; inpicref->data[plane] && plane < 4; plane++) {
+ int y = plane == 1 || plane == 2 ? y0 >> boxblur->vsub : y0;
+ src[plane] = inpicref ->data[plane] + inpicref ->linesize[plane] * y;
+ dst[plane] = outpicref->data[plane] + outpicref->linesize[plane] * y;
+ }
+
+ for (plane = 0; inpicref->data[plane] && plane < 4; plane++)
+ hblur(outpicref->data[plane], outpicref->linesize[plane],
+ inpicref ->data[plane], inpicref ->linesize[plane],
+ w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane],
+ boxblur->temp);
+
+ for (plane = 0; inpicref->data[plane] && plane < 4; plane++)
+ vblur(outpicref->data[plane], outpicref->linesize[plane],
+ outpicref->data[plane], outpicref->linesize[plane],
+ w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane],
+ boxblur->temp);
+}
+
+AVFilter avfilter_vf_boxblur = {
+ .name = "boxblur",
+ .description = NULL_IF_CONFIG_SMALL("Blur the input."),
+ .priv_size = sizeof(BoxBlurContext),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+
+ .inputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ .draw_slice = draw_slice,
+ .min_perms = AV_PERM_READ },
+ { .name = NULL}},
+ .outputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO, },
+ { .name = NULL}},
+};
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