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libavfilter: add deshake filter 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
tags/n0.9
danielgtaylor Michael Niedermayer 14 years ago
parent
7985381e23
commit
0cc2ed4a20
3 changed files with 525 additions and 1 deletions
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  1. +3
    -1
      libavfilter/Makefile
  2. +1
    -0
      libavfilter/allfilters.c
  3. +521
    -0
      libavfilter/vf_deshake.c

+ 3
- 1
libavfilter/Makefile View File

@@ -18,7 +18,8 @@ OBJS = allfilters.o \
defaults.o \ defaults.o \
drawutils.o \ drawutils.o \
formats.o \ formats.o \
graphparser.o \
graphparser.o \
transform.o \


OBJS-$(CONFIG_AVCODEC) += avcodec.o OBJS-$(CONFIG_AVCODEC) += avcodec.o


@@ -41,6 +42,7 @@ OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
OBJS-$(CONFIG_CROPDETECT_FILTER) += vf_cropdetect.o OBJS-$(CONFIG_CROPDETECT_FILTER) += vf_cropdetect.o
OBJS-$(CONFIG_DELOGO_FILTER) += vf_delogo.o OBJS-$(CONFIG_DELOGO_FILTER) += vf_delogo.o
OBJS-$(CONFIG_DESHAKE_FILTER) += vf_deshake.o
OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o


+ 1
- 0
libavfilter/allfilters.c View File

@@ -53,6 +53,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (CROP, crop, vf); REGISTER_FILTER (CROP, crop, vf);
REGISTER_FILTER (CROPDETECT, cropdetect, vf); REGISTER_FILTER (CROPDETECT, cropdetect, vf);
REGISTER_FILTER (DELOGO, delogo, vf); REGISTER_FILTER (DELOGO, delogo, vf);
REGISTER_FILTER (DESHAKE, deshake, vf);
REGISTER_FILTER (DRAWBOX, drawbox, vf); REGISTER_FILTER (DRAWBOX, drawbox, vf);
REGISTER_FILTER (DRAWTEXT, drawtext, vf); REGISTER_FILTER (DRAWTEXT, drawtext, vf);
REGISTER_FILTER (FADE, fade, vf); REGISTER_FILTER (FADE, fade, vf);


+ 521
- 0
libavfilter/vf_deshake.c View File

@@ -0,0 +1,521 @@
/*
* Copyright (C) 2010 Georg Martius <georg.martius@web.de>
* Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
*
* 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
*/

/**
* @file libavfilter/vf_deshake.c
* fast deshake / depan video filter
*
* SAD block-matching motion compensation to fix small changes in
* horizontal and/or vertical shift. This filter helps remove camera shake
* from hand-holding a camera, bumping a tripod, moving on a vehicle, etc.
*
* Algorithm:
* - For each frame with one previous reference frame
* - For each block in the frame
* - If contrast > threshold then find likely motion vector
* - For all found motion vectors
* - Find most common, store as global motion vector
* - Find most likely rotation angle
* - Transform image along global motion
*
* TODO:
* - Fill frame edges based on previous/next reference frames
* - Fill frame edges by stretching image near the edges?
* - Can this be done quickly and look decent?
*
* Dark Shikari links to http://wiki.videolan.org/SoC_x264_2010#GPU_Motion_Estimation_2
* for an algorithm similar to what could be used here to get the gmv
* It requires only a couple diamond searches + fast downscaling
*
* Special thanks to Jason Kotenko for his help with the algorithm and my
* inability to see simple errors in C code.
*/

#include "avfilter.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/dsputil.h"

#include "transform.h"

#define CHROMA_WIDTH(link) -((-link->w) >> av_pix_fmt_descriptors[link->format].log2_chroma_w)
#define CHROMA_HEIGHT(link) -((-link->h) >> av_pix_fmt_descriptors[link->format].log2_chroma_h)

enum SearchMethod {
EXHAUSTIVE, //< Search all possible positions
SMART_EXHAUSTIVE, //< Search most possible positions (faster)
SEARCH_COUNT
};

typedef struct {
double x; //< Horizontal shift
double y; //< Vertical shift
} MotionVector;

typedef struct {
MotionVector vector; //< Motion vector
double angle; //< Angle of rotation
double zoom; //< Zoom percentage
} Transform;

typedef struct {
AVFilterBufferRef *ref; //< Previous frame
int rx; //< Maximum horizontal shift
int ry; //< Maximum vertical shift
enum FillMethod edge; //< Edge fill method
int blocksize; //< Size of blocks to compare
int contrast; //< Contrast threshold
enum SearchMethod search; //< Motion search method
AVCodecContext *avctx;
DSPContext c; //< Context providing optimized SAD methods
Transform last; //< Transform from last frame
int refcount; //< Number of reference frames (defines averaging window)
FILE *fp;
} DeshakeContext;

static int cmp(void const *ca, void const *cb)
{
double *a = (double *) ca;
double *b = (double *) cb;
return *a < *b ? -1 : ( *a > *b ? 1 : 0 );
}

/**
* Cleaned mean (cuts off 20% of values to remove outliers and then averages)
*/
static double clean_mean(double *values, int count)
{
double mean = 0;
int cut = count / 5;
int x;

qsort(values, count, sizeof(double), cmp);

for (x = cut; x < count - cut; x++) {
mean += values[x];
}

return mean / (count - cut * 2);
}

/**
* Find the most likely shift in motion between two frames for a given
* macroblock. Test each block against several shifts given by the rx
* and ry attributes. Searches using a simple matrix of those shifts and
* chooses the most likely shift by the smallest difference in blocks.
*/
static void find_block_motion(DeshakeContext *deshake, uint8_t *src1,
uint8_t *src2, int cx, int cy, int stride,
MotionVector *mv)
{
int x, y;
int diff;
int smallest = INT_MAX;
int tmp, tmp2;

#define CMP(i, j) deshake->c.sad[0](deshake, src1 + cy * stride + cx, \
src2 + (j) * stride + (i), stride, \
deshake->blocksize)

if (deshake->search == EXHAUSTIVE) {
// Compare every possible position - this is sloooow!
for (y = -deshake->ry; y <= deshake->ry; y++) {
for (x = -deshake->rx; x <= deshake->rx; x++) {
diff = CMP(cx - x, cy - y);
if (diff < smallest) {
smallest = diff;
mv->x = x;
mv->y = y;
}
}
}
} else if (deshake->search == SMART_EXHAUSTIVE) {
// Compare every other possible position and find the best match
for (y = -deshake->ry + 1; y < deshake->ry - 2; y += 2) {
for (x = -deshake->rx + 1; x < deshake->rx - 2; x += 2) {
diff = CMP(cx - x, cy - y);
if (diff < smallest) {
smallest = diff;
mv->x = x;
mv->y = y;
}
}
}

// Hone in on the specific best match around the match we found above
tmp = mv->x;
tmp2 = mv->y;

for (y = tmp2 - 1; y <= tmp2 + 1; y++) {
for (x = tmp - 1; x <= tmp + 1; x++) {
if (x == tmp && y == tmp2)
continue;

diff = CMP(cx - x, cy - y);
if (diff < smallest) {
smallest = diff;
mv->x = x;
mv->y = y;
}
}
}
}

if (smallest > 512) {
mv->x = -1;
mv->y = -1;
}
emms_c();
//av_log(NULL, AV_LOG_ERROR, "%d\n", smallest);
//av_log(NULL, AV_LOG_ERROR, "Final: (%d, %d) = %d x %d\n", cx, cy, mv->x, mv->y);
}

/**
* Find the contrast of a given block. When searching for global motion we
* really only care about the high contrast blocks, so using this method we
* can actually skip blocks we don't care much about.
*/
static int block_contrast(uint8_t *src, int x, int y, int stride, int blocksize)
{
int highest = 0;
int lowest = 0;
int i, j, pos;

for (i = 0; i <= blocksize * 2; i++) {
// We use a width of 16 here to match the libavcodec sad functions
for (j = 0; i <= 15; i++) {
pos = (y - i) * stride + (x - j);
if (src[pos] < lowest)
lowest = src[pos];
else if (src[pos] > highest) {
highest = src[pos];
}
}
}

return highest - lowest;
}

/**
* Find the rotation for a given block.
*/
static double block_angle(int x, int y, int cx, int cy, MotionVector *shift)
{
double a1, a2, diff;

a1 = atan2(y - cy, x - cx);
a2 = atan2(y - cy + shift->y, x - cx + shift->x);

diff = a2 - a1;

return (diff > M_PI) ? diff - 2 * M_PI :
(diff < -M_PI) ? diff + 2 * M_PI :
diff;
}

/**
* Find the estimated global motion for a scene given the most likely shift
* for each block in the frame. The global motion is estimated to be the
* same as the motion from most blocks in the frame, so if most blocks
* move one pixel to the right and two pixels down, this would yield a
* motion vector (1, -2).
*/
static void find_motion(DeshakeContext *deshake, uint8_t *src1, uint8_t *src2,
int width, int height, int stride, Transform *t)
{
int x, y;
MotionVector mv = {0, 0};
int counts[128][128];
int count_max_value = 0;
int contrast;

int pos;
double angles[1200];
double totalangles = 0;

int center_x = 0, center_y = 0;
double p_x, p_y;

// Reset counts to zero
for (x = 0; x < deshake->rx * 2 + 1; x++) {
for (y = 0; y < deshake->ry * 2 + 1; y++) {
counts[x][y] = 0;
}
}

pos = 0;
// Find motion for every block and store the motion vector in the counts
for (y = deshake->ry; y < height - deshake->ry - (deshake->blocksize * 2); y += deshake->blocksize * 2) {
// We use a width of 16 here to match the libavcodec sad functions
for (x = deshake->rx; x < width - deshake->rx - 16; x += 16) {
// If the contrast is too low, just skip this block as it probably
// won't be very useful to us.
contrast = block_contrast(src2, x, y, stride, deshake->blocksize);
if (contrast > deshake->contrast) {
//av_log(NULL, AV_LOG_ERROR, "%d\n", contrast);
find_block_motion(deshake, src1, src2, x, y, stride, &mv);
if (mv.x != -1 && mv.y != -1) {
counts[(int)(mv.x + deshake->rx)][(int)(mv.y + deshake->ry)] += 1;
if (x > deshake->rx && y > deshake->ry)
angles[pos++] = block_angle(x, y, 0, 0, &mv);

center_x += mv.x;
center_y += mv.y;
}
}
}
}

pos = FFMAX(1, pos);

center_x /= pos;
center_y /= pos;

for (x = 0; x < pos; x++) {
totalangles += angles[x];
}

//av_log(NULL, AV_LOG_ERROR, "Angle: %lf\n", totalangles / (pos - 1));
t->angle = totalangles / (pos - 1);

t->angle = clean_mean(angles, pos);
if (t->angle < 0.001)
t->angle = 0;

// Find the most common motion vector in the frame and use it as the gmv
for (y = deshake->ry * 2; y >= 0; y--) {
for (x = 0; x < deshake->rx * 2 + 1; x++) {
//av_log(NULL, AV_LOG_ERROR, "%5d ", counts[x][y]);
if (counts[x][y] > count_max_value) {
t->vector.x = x - deshake->rx;
t->vector.y = y - deshake->ry;
count_max_value = counts[x][y];
}
}
//av_log(NULL, AV_LOG_ERROR, "\n");
}

p_x = (center_x - width / 2);
p_y = (center_y - height / 2);
t->vector.x += (cos(t->angle)-1)*p_x - sin(t->angle)*p_y;
t->vector.y += sin(t->angle)*p_x + (cos(t->angle)-1)*p_y;

// Clamp max shift & rotation?
t->vector.x = av_clipf(t->vector.x, -deshake->rx * 2, deshake->rx * 2);
t->vector.y = av_clipf(t->vector.y, -deshake->ry * 2, deshake->ry * 2);
t->angle = av_clipf(t->angle, -0.1, 0.1);

//av_log(NULL, AV_LOG_ERROR, "%d x %d\n", avg->x, avg->y);
}

static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
DeshakeContext *deshake = ctx->priv;

deshake->rx = 16;
deshake->ry = 16;
deshake->edge = FILL_BLANK;
deshake->blocksize = 8;
deshake->contrast = 125;
deshake->search = EXHAUSTIVE;
deshake->refcount = 20;
deshake->fp = fopen("stats.txt", "w");
fwrite("Ori x, Avg x, Fin x, Ori y, Avg y, Fin y, Ori angle, Avg angle, Fin angle, Ori zoom, Avg zoom, Fin zoom\n", sizeof(char), 104, deshake->fp);

if (args) {
sscanf(args, "%d:%d:%d:%d:%d:%d", &deshake->rx, &deshake->ry, (int *)&deshake->edge,
&deshake->blocksize, &deshake->contrast, (int *)&deshake->search);

deshake->blocksize /= 2;

deshake->rx = av_clip(deshake->rx, 0, 64);
deshake->ry = av_clip(deshake->ry, 0, 64);
deshake->edge = av_clip(deshake->edge, FILL_BLANK, FILL_COUNT - 1);
deshake->blocksize = av_clip(deshake->blocksize, 4, 128);
deshake->contrast = av_clip(deshake->contrast, 1, 255);
deshake->search = av_clip(deshake->search, EXHAUSTIVE, SEARCH_COUNT - 1);
}

av_log(ctx, AV_LOG_INFO, "rx: %d, ry: %d, edge: %d blocksize: %d contrast: %d search: %d\n",
deshake->rx, deshake->ry, deshake->edge, deshake->blocksize * 2, deshake->contrast, deshake->search);

return 0;
}

static int query_formats(AVFilterContext *ctx)
{
enum PixelFormat pix_fmts[] = {
PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_YUV410P,
PIX_FMT_YUV411P, PIX_FMT_YUV440P, PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P,
PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
};

avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

return 0;
}

static int config_props(AVFilterLink *link)
{
DeshakeContext *deshake = link->dst->priv;

deshake->ref = NULL;
deshake->last.vector.x = 0;
deshake->last.vector.y = 0;
deshake->last.angle = 0;
deshake->last.zoom = 0;

deshake->avctx= avcodec_alloc_context3(NULL);
dsputil_init(&deshake->c, deshake->avctx);

return 0;
}

static av_cold void uninit(AVFilterContext *ctx)
{
DeshakeContext *deshake = ctx->priv;

avfilter_unref_buffer(deshake->ref);
fclose(deshake->fp);
}

static void end_frame(AVFilterLink *link)
{
DeshakeContext *deshake = link->dst->priv;
AVFilterBufferRef *in = link->cur_buf;
AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
Transform t;
static float matrix[9];
static Transform avg = {
.vector = {
.x = 0,
.y = 0
},
.angle = 0,
.zoom = 0.0f
};
float alpha = 2.0 / deshake->refcount;
char tmp[256];
Transform orig;

// Find the most likely global motion for the current frame
find_motion(deshake, (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0], in->data[0], link->w, link->h, in->linesize[0], &t);

// Copy transform so we can output it later to compare to the smoothed value
orig.vector.x = t.vector.x;
orig.vector.y = t.vector.y;
orig.angle = t.angle;
orig.zoom = t.zoom;

// Generate a one-sided moving exponential average
avg.vector.x = alpha * t.vector.x + (1.0 - alpha) * avg.vector.x;
avg.vector.y = alpha * t.vector.y + (1.0 - alpha) * avg.vector.y;
avg.angle = alpha * t.angle + (1.0 - alpha) * avg.angle;
avg.zoom = alpha * t.zoom + (1.0 - alpha) * avg.zoom;

// Remove the average from the current motion to detect the motion that
// is not on purpose, just as jitter from bumping the camera
t.vector.x -= avg.vector.x;
t.vector.y -= avg.vector.y;
t.angle -= avg.angle;
t.zoom -= avg.zoom;

// Invert the motion to undo it
t.vector.x *= -1;
t.vector.y *= -1;
t.angle *= -1;

// Write statistics to file
snprintf(tmp, 256, "%f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f\n", orig.vector.x, avg.vector.x, t.vector.x, orig.vector.y, avg.vector.y, t.vector.y, orig.angle, avg.angle, t.angle, orig.zoom, avg.zoom, t.zoom);
fwrite(tmp, sizeof(char), strlen(tmp), deshake->fp);

// Turn relative current frame motion into absolute by adding it to the
// last absolute motion
t.vector.x += deshake->last.vector.x;
t.vector.y += deshake->last.vector.y;
t.angle += deshake->last.angle;
t.zoom += deshake->last.zoom;

// Shrink motion by 10% to keep things centered in the camera frame
t.vector.x *= 0.9;
t.vector.y *= 0.9;
t.angle *= 0.9;

// Store the last absolute motion information
deshake->last.vector.x = t.vector.x;
deshake->last.vector.y = t.vector.y;
deshake->last.angle = t.angle;
deshake->last.zoom = t.zoom;

// Generate a luma transformation matrix
avfilter_get_matrix(t.vector.x, t.vector.y, t.angle, 1.0 + t.zoom / 100.0, matrix);

// Transform the luma plane
avfilter_transform(in->data[0], out->data[0], in->linesize[0], out->linesize[0], link->w, link->h, matrix, INTERPOLATE_BILINEAR, deshake->edge);

// Generate a chroma transformation matrix
avfilter_get_matrix(t.vector.x / (link->w / CHROMA_WIDTH(link)), t.vector.y / (link->h / CHROMA_HEIGHT(link)), t.angle, 1.0 + t.zoom / 100.0, matrix);

// Transform the chroma planes
avfilter_transform(in->data[1], out->data[1], in->linesize[1], out->linesize[1], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), matrix, INTERPOLATE_BILINEAR, deshake->edge);
avfilter_transform(in->data[2], out->data[2], in->linesize[2], out->linesize[2], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), matrix, INTERPOLATE_BILINEAR, deshake->edge);

// Store the current frame as the reference frame for calculating the
// motion of the next frame
if (deshake->ref != NULL)
avfilter_unref_buffer(deshake->ref);

// Cleanup the old reference frame
deshake->ref = in;

// Draw the transformed frame information
avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
avfilter_end_frame(link->dst->outputs[0]);
avfilter_unref_buffer(out);
}

static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
}

AVFilter avfilter_vf_deshake = {
.name = "deshake",
.description = NULL_IF_CONFIG_SMALL("Stabilize shaky video."),

.priv_size = sizeof(DeshakeContext),

.init = init,
.uninit = uninit,
.query_formats = query_formats,

.inputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.draw_slice = draw_slice,
.end_frame = end_frame,
.config_props = config_props,
.min_perms = AV_PERM_READ, },
{ .name = NULL}},

.outputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};

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