[FFmpeg-devel] [PATCH] lavfi: port MP noise filter
Paul B Mahol
onemda at gmail.com
Sun Feb 10 23:47:09 CET 2013
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
configure | 1 +
doc/filters.texi | 33 +++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_noise.c | 337 +++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 373 insertions(+)
create mode 100644 libavfilter/vf_noise.c
diff --git a/configure b/configure
index 8b6113d..fda0e94 100755
--- a/configure
+++ b/configure
@@ -2012,6 +2012,7 @@ movie_filter_deps="avcodec avformat"
mp_filter_deps="gpl avcodec swscale inline_asm"
mptestsrc_filter_deps="gpl"
negate_filter_deps="lut_filter"
+noise_filter_deps="gpl"
resample_filter_deps="avresample"
ocv_filter_deps="libopencv"
pan_filter_deps="swresample"
diff --git a/doc/filters.texi b/doc/filters.texi
index 4613917..8ca8012 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -4684,6 +4684,39 @@ Default value is @code{none}.
Swap luma/chroma/alpha fields. Exchange even & odd lines. Default value is @code{0}.
@end table
+ at section noise
+Apply noise on video input frame.
+
+It accepts a list of options in the form of @var{key}=@var{value} pairs
+separated by ":". A description of the accepted options follows.
+
+ at table @option
+ at item c0_strength, c0s
+ at item c1_strength, c1s
+ at item c2_strength, c2s
+ at item c3_strength, c3s
+Set noise strength for pixel component. Default value is @code{0}.
+Allowed range is [0, 100].
+
+ at item c0_flags, c0f
+ at item c1_flags, c1f
+ at item c2_flags, c2f
+ at item c3_flags, c3f
+Set pixel component flags. Available values for component flags are:
+ at table @samp
+ at item a
+averaged temporal noise (smoother)
+ at item p
+mix random noise with a (semi)regular pattern
+ at item q
+higher quality (slightly better looking, slightly slower)
+ at item t
+temporal noise (noise pattern changes between frames)
+ at item u
+uniform noise (gaussian otherwise)
+ at end table
+ at end table
+
@section thumbnail
Select the most representative frame in a given sequence of consecutive frames.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 9158188..906f3a4 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -134,6 +134,7 @@ OBJS-$(CONFIG_LUTYUV_FILTER) += vf_lut.o
OBJS-$(CONFIG_MP_FILTER) += vf_mp.o
OBJS-$(CONFIG_NEGATE_FILTER) += vf_lut.o
OBJS-$(CONFIG_NOFORMAT_FILTER) += vf_format.o
+OBJS-$(CONFIG_NOISE_FILTER) += vf_noise.o
OBJS-$(CONFIG_NULL_FILTER) += vf_null.o
OBJS-$(CONFIG_OCV_FILTER) += vf_libopencv.o
OBJS-$(CONFIG_OVERLAY_FILTER) += vf_overlay.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index ff55428..61f29ff 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -128,6 +128,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(MP, mp, vf);
REGISTER_FILTER(NEGATE, negate, vf);
REGISTER_FILTER(NOFORMAT, noformat, vf);
+ REGISTER_FILTER(NOISE, noise, vf);
REGISTER_FILTER(NULL, null, vf);
REGISTER_FILTER(OCV, ocv, vf);
REGISTER_FILTER(OVERLAY, overlay, vf);
diff --git a/libavfilter/vf_noise.c b/libavfilter/vf_noise.c
new file mode 100644
index 0000000..73ac173
--- /dev/null
+++ b/libavfilter/vf_noise.c
@@ -0,0 +1,337 @@
+/*
+ * Copyright (c) 2002 Michael Niedermayer <michaelni at gmx.at>
+ * Copyright (c) 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 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
+ * noise generator
+ */
+
+#include "libavutil/opt.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define MAX_NOISE 4096
+#define MAX_SHIFT 1024
+#define MAX_RES (MAX_NOISE-MAX_SHIFT)
+
+#define NOISE_UNIFORM 1
+#define NOISE_TEMPORAL 2
+#define NOISE_QUALITY 4
+#define NOISE_AVERAGED 8
+#define NOISE_PATTERN 16
+
+typedef struct {
+ const AVClass *class;
+ int nb_planes;
+ int linesize[4];
+ int height[4];
+ int strength[4];
+ int flags[4];
+ int shiftptr[4];
+ int8_t *noise[4];
+ int8_t *prev_shift[4][MAX_RES][3];
+ int rand_shift[MAX_RES];
+ int rand_shift_init;
+} NoiseContext;
+
+#define OFFSET(x) offsetof(NoiseContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+#define NOISE_PARAMS(name, x) \
+ {#name"_strength", "set component #"#x" strength", OFFSET(strength[x]), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
+ {#name"s", "set component #"#x" strength", OFFSET(strength[x]), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
+ {#name"_flags", "set component #"#x" flags", OFFSET(flags[x]), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
+ {#name"f", "set component #"#x" flags", OFFSET(flags[x]), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
+ {"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, #name"_flags"}, \
+ {"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, #name"_flags"}, \
+ {"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, #name"_flags"}, \
+ {"q", "high quality", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_QUALITY}, 0, 0, FLAGS, #name"_flags"}, \
+ {"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, #name"_flags"},
+
+static const AVOption noise_options[] = {
+ NOISE_PARAMS(c0, 0)
+ NOISE_PARAMS(c1, 1)
+ NOISE_PARAMS(c2, 2)
+ NOISE_PARAMS(c3, 3)
+ {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(noise);
+
+static const int8_t patt[4] = { -1, 0, 1, 0 };
+
+#define RAND_N(range) ((int) ((double) range * rand() / (RAND_MAX + 1.0)))
+static int init_noise(NoiseContext *n, int comp)
+{
+ int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t));
+ int strength = n->strength[comp];
+ int flags = n->flags[comp];
+ int i, j;
+
+ if (!noise)
+ return AVERROR(ENOMEM);
+
+ srand(123457);
+
+ for (i = 0, j = 0; i < MAX_NOISE; i++,j++) {
+ if (flags & NOISE_UNIFORM) {
+ if (flags & NOISE_AVERAGED) {
+ if (flags & NOISE_PATTERN) {
+ noise[i] = (RAND_N(strength) - strength/2)/6
+ +patt[j%4]*strength*0.25/3;
+ } else {
+ noise[i]= (RAND_N(strength) - strength/2)/3;
+ }
+ } else {
+ if (flags & NOISE_PATTERN) {
+ noise[i]= (RAND_N(strength) - strength/2)/2
+ + patt[j%4]*strength*0.25;
+ } else {
+ noise[i]= RAND_N(strength) - strength/2;
+ }
+ }
+ } else {
+ double x1, x2, w, y1;
+ do {
+ x1 = 2.0 * rand()/(float)RAND_MAX - 1.0;
+ x2 = 2.0 * rand()/(float)RAND_MAX - 1.0;
+ w = x1 * x1 + x2 * x2;
+ } while ( w >= 1.0 );
+
+ w = sqrt( (-2.0 * log( w ) ) / w );
+ y1= x1 * w;
+ y1*= strength / sqrt(3.0);
+ if (flags & NOISE_PATTERN) {
+ y1 /= 2;
+ y1 += patt[j%4]*strength*0.35;
+ }
+ if (y1 < -128)
+ y1 = -128;
+ else if (y1 > 127)
+ y1 = 127;
+ if (flags & NOISE_AVERAGED)
+ y1 /= 3.0;
+ noise[i]= (int)y1;
+ }
+ if (RAND_N(6) == 0)
+ j--;
+ }
+
+ for (i = 0; i < MAX_RES; i++)
+ for (j = 0; j < 3; j++)
+ n->prev_shift[comp][i][j] = noise + (rand() & (MAX_SHIFT - 1));
+
+ if (!n->rand_shift_init) {
+ for (i = 0; i < MAX_RES; i++)
+ n->rand_shift[i] = rand() & (MAX_SHIFT-1);
+ n->rand_shift_init = 1;
+ }
+
+ n->noise[comp] = noise;
+ n->shiftptr[comp] = 0;
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+ NoiseContext *n = ctx->priv;
+ int ret, i;
+
+ n->class = &noise_class;
+ av_opt_set_defaults(n);
+
+ if ((ret = av_set_options_string(n, args, "=", ":")) < 0)
+ return ret;
+
+ for (i = 0; i < 4; i++) {
+ if ((ret = init_noise(n, i)) < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *formats = NULL;
+ int fmt;
+
+ for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
+ if (desc->flags & PIX_FMT_PLANAR && !((desc->comp[0].depth_minus1 + 1) & 7))
+ ff_add_format(&formats, fmt);
+ }
+
+ ff_set_common_formats(ctx, formats);
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ NoiseContext *n = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ int i, ret;
+
+ for (i = 0; i < desc->nb_components; i++)
+ n->nb_planes = FFMAX(n->nb_planes, desc->comp[i].plane);
+ n->nb_planes++;
+
+ if ((ret = av_image_fill_linesizes(n->linesize, inlink->format, inlink->w)) < 0)
+ return ret;
+
+ n->height[1] = n->height[2] = inlink->h >> desc->log2_chroma_h;
+ n->height[0] = n->height[3] = inlink->h;
+
+ return 0;
+}
+
+static void line_noise(uint8_t *dst, const uint8_t *src, int8_t *noise,
+ int len, int shift)
+{
+ int i;
+
+ noise += shift;
+ for (i = 0; i < len; i++) {
+ int v = src[i] + noise[i];
+
+ dst[i] = av_clip_uint8(v);
+ }
+}
+
+static void line_noise_avg(uint8_t *dst, const uint8_t *src,
+ int len, int8_t **shift)
+{
+ int i;
+ int8_t *src2 = (int8_t*)src;
+
+ for (i = 0; i < len; i++) {
+ const int n = shift[0][i] + shift[1][i] + shift[2][i];
+ dst[i] = src2[i] + ((n * src2[i]) >> 7);
+ }
+}
+
+static void noise(uint8_t *dst, uint8_t *src,
+ int dst_linesize, int src_linesize,
+ int width, int height, NoiseContext *n, int comp)
+{
+ int8_t *noise = n->noise[comp];
+ int flags = n->flags[comp];
+ int shift;
+ int y;
+
+ for (y = 0; y < height; y++) {
+ if (flags & NOISE_TEMPORAL)
+ shift = rand() & (MAX_SHIFT - 1);
+ else
+ shift = n->rand_shift[y];
+
+ if (!(flags & NOISE_QUALITY))
+ shift &= ~7;
+
+ if (flags & NOISE_AVERAGED) {
+ line_noise_avg(dst, src, width, n->prev_shift[comp][y]);
+ n->prev_shift[comp][y][n->shiftptr[comp]] = noise + shift;
+ } else {
+ line_noise(dst, src, noise, width, shift);
+ }
+ dst += dst_linesize;
+ src += src_linesize;
+ }
+
+ n->shiftptr[comp]++;
+ if (n->shiftptr[comp] == 3)
+ n->shiftptr[comp] = 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+{
+ NoiseContext *n = inlink->dst->priv;
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ AVFilterBufferRef *out;
+ int ret, i;
+
+ if (inpicref->perms & AV_PERM_WRITE) {
+ out = inpicref;
+ } else {
+ out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+ if (!out) {
+ avfilter_unref_bufferp(&inpicref);
+ return AVERROR(ENOMEM);
+ }
+ avfilter_copy_buffer_ref_props(out, inpicref);
+ }
+
+ for (i = 0; i < n->nb_planes; i++)
+ if (n->strength[i])
+ noise(out->data[i], inpicref->data[i], out->linesize[i],
+ inpicref->linesize[i], n->linesize[i], n->height[i], n, i);
+
+ ret = ff_filter_frame(outlink, out);
+ if (inpicref != out)
+ avfilter_unref_buffer(inpicref);
+ return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ NoiseContext *n = ctx->priv;
+ int i;
+
+ for (i = 0; i < 4; i++)
+ av_freep(&n->noise[i]);
+ av_opt_free(n);
+}
+
+static const AVFilterPad inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = ff_null_get_video_buffer,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ },
+ { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter avfilter_vf_noise = {
+ .name = "noise",
+ .description = NULL_IF_CONFIG_SMALL("Noise generator."),
+ .priv_size = sizeof(NoiseContext),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = inputs,
+ .outputs = outputs,
+ .priv_class = &noise_class,
+};
--
1.7.11.4
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