561 lines
19 KiB
C
561 lines
19 KiB
C
/*
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* Copyright (C) 2010 Georg Martius <georg.martius@web.de>
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* Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* fast deshake / depan video filter
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*
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* SAD block-matching motion compensation to fix small changes in
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* horizontal and/or vertical shift. This filter helps remove camera shake
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* from hand-holding a camera, bumping a tripod, moving on a vehicle, etc.
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*
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* Algorithm:
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* - For each frame with one previous reference frame
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* - For each block in the frame
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* - If contrast > threshold then find likely motion vector
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* - For all found motion vectors
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* - Find most common, store as global motion vector
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* - Find most likely rotation angle
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* - Transform image along global motion
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*
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* TODO:
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* - Fill frame edges based on previous/next reference frames
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* - Fill frame edges by stretching image near the edges?
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* - Can this be done quickly and look decent?
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*
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* Dark Shikari links to http://wiki.videolan.org/SoC_x264_2010#GPU_Motion_Estimation_2
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* for an algorithm similar to what could be used here to get the gmv
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* It requires only a couple diamond searches + fast downscaling
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*
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* Special thanks to Jason Kotenko for his help with the algorithm and my
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* inability to see simple errors in C code.
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*/
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#include "avfilter.h"
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#include "formats.h"
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#include "video.h"
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#include "libavutil/common.h"
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#include "libavutil/mem.h"
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#include "libavutil/pixdesc.h"
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#include "libavcodec/dsputil.h"
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#include "transform.h"
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#define CHROMA_WIDTH(link) -((-link->w) >> av_pix_fmt_descriptors[link->format].log2_chroma_w)
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#define CHROMA_HEIGHT(link) -((-link->h) >> av_pix_fmt_descriptors[link->format].log2_chroma_h)
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enum SearchMethod {
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EXHAUSTIVE, ///< Search all possible positions
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SMART_EXHAUSTIVE, ///< Search most possible positions (faster)
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SEARCH_COUNT
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};
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typedef struct {
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int x; ///< Horizontal shift
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int y; ///< Vertical shift
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} IntMotionVector;
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typedef struct {
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double x; ///< Horizontal shift
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double y; ///< Vertical shift
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} MotionVector;
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typedef struct {
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MotionVector vector; ///< Motion vector
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double angle; ///< Angle of rotation
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double zoom; ///< Zoom percentage
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} Transform;
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typedef struct {
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AVClass av_class;
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AVFilterBufferRef *ref; ///< Previous frame
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int rx; ///< Maximum horizontal shift
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int ry; ///< Maximum vertical shift
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enum FillMethod edge; ///< Edge fill method
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int blocksize; ///< Size of blocks to compare
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int contrast; ///< Contrast threshold
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enum SearchMethod search; ///< Motion search method
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AVCodecContext *avctx;
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DSPContext c; ///< Context providing optimized SAD methods
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Transform last; ///< Transform from last frame
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int refcount; ///< Number of reference frames (defines averaging window)
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FILE *fp;
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Transform avg;
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int cw; ///< Crop motion search to this box
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int ch;
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int cx;
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int cy;
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} DeshakeContext;
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static int cmp(const double *a, const double *b)
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{
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return *a < *b ? -1 : ( *a > *b ? 1 : 0 );
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}
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/**
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* Cleaned mean (cuts off 20% of values to remove outliers and then averages)
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*/
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static double clean_mean(double *values, int count)
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{
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double mean = 0;
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int cut = count / 5;
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int x;
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qsort(values, count, sizeof(double), (void*)cmp);
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for (x = cut; x < count - cut; x++) {
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mean += values[x];
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}
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return mean / (count - cut * 2);
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}
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/**
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* Find the most likely shift in motion between two frames for a given
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* macroblock. Test each block against several shifts given by the rx
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* and ry attributes. Searches using a simple matrix of those shifts and
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* chooses the most likely shift by the smallest difference in blocks.
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*/
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static void find_block_motion(DeshakeContext *deshake, uint8_t *src1,
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uint8_t *src2, int cx, int cy, int stride,
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IntMotionVector *mv)
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{
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int x, y;
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int diff;
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int smallest = INT_MAX;
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int tmp, tmp2;
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#define CMP(i, j) deshake->c.sad[0](deshake, src1 + cy * stride + cx, \
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src2 + (j) * stride + (i), stride, \
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deshake->blocksize)
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if (deshake->search == EXHAUSTIVE) {
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// Compare every possible position - this is sloooow!
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for (y = -deshake->ry; y <= deshake->ry; y++) {
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for (x = -deshake->rx; x <= deshake->rx; x++) {
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diff = CMP(cx - x, cy - y);
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if (diff < smallest) {
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smallest = diff;
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mv->x = x;
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mv->y = y;
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}
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}
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}
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} else if (deshake->search == SMART_EXHAUSTIVE) {
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// Compare every other possible position and find the best match
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for (y = -deshake->ry + 1; y < deshake->ry - 2; y += 2) {
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for (x = -deshake->rx + 1; x < deshake->rx - 2; x += 2) {
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diff = CMP(cx - x, cy - y);
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if (diff < smallest) {
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smallest = diff;
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mv->x = x;
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mv->y = y;
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}
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}
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}
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// Hone in on the specific best match around the match we found above
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tmp = mv->x;
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tmp2 = mv->y;
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for (y = tmp2 - 1; y <= tmp2 + 1; y++) {
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for (x = tmp - 1; x <= tmp + 1; x++) {
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if (x == tmp && y == tmp2)
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continue;
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diff = CMP(cx - x, cy - y);
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if (diff < smallest) {
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smallest = diff;
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mv->x = x;
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mv->y = y;
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}
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}
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}
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}
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if (smallest > 512) {
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mv->x = -1;
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mv->y = -1;
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}
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emms_c();
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//av_log(NULL, AV_LOG_ERROR, "%d\n", smallest);
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//av_log(NULL, AV_LOG_ERROR, "Final: (%d, %d) = %d x %d\n", cx, cy, mv->x, mv->y);
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}
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/**
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* Find the contrast of a given block. When searching for global motion we
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* really only care about the high contrast blocks, so using this method we
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* can actually skip blocks we don't care much about.
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*/
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static int block_contrast(uint8_t *src, int x, int y, int stride, int blocksize)
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{
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int highest = 0;
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int lowest = 0;
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int i, j, pos;
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for (i = 0; i <= blocksize * 2; i++) {
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// We use a width of 16 here to match the libavcodec sad functions
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for (j = 0; i <= 15; i++) {
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pos = (y - i) * stride + (x - j);
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if (src[pos] < lowest)
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lowest = src[pos];
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else if (src[pos] > highest) {
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highest = src[pos];
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}
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}
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}
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return highest - lowest;
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}
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/**
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* Find the rotation for a given block.
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*/
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static double block_angle(int x, int y, int cx, int cy, IntMotionVector *shift)
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{
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double a1, a2, diff;
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a1 = atan2(y - cy, x - cx);
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a2 = atan2(y - cy + shift->y, x - cx + shift->x);
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diff = a2 - a1;
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return (diff > M_PI) ? diff - 2 * M_PI :
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(diff < -M_PI) ? diff + 2 * M_PI :
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diff;
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}
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/**
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* Find the estimated global motion for a scene given the most likely shift
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* for each block in the frame. The global motion is estimated to be the
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* same as the motion from most blocks in the frame, so if most blocks
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* move one pixel to the right and two pixels down, this would yield a
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* motion vector (1, -2).
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*/
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static void find_motion(DeshakeContext *deshake, uint8_t *src1, uint8_t *src2,
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int width, int height, int stride, Transform *t)
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{
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int x, y;
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IntMotionVector mv = {0, 0};
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int counts[128][128];
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int count_max_value = 0;
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int contrast;
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int pos;
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double *angles = av_malloc(sizeof(*angles) * width * height / (16 * deshake->blocksize));
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int center_x = 0, center_y = 0;
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double p_x, p_y;
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// Reset counts to zero
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for (x = 0; x < deshake->rx * 2 + 1; x++) {
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for (y = 0; y < deshake->ry * 2 + 1; y++) {
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counts[x][y] = 0;
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}
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}
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pos = 0;
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// Find motion for every block and store the motion vector in the counts
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for (y = deshake->ry; y < height - deshake->ry - (deshake->blocksize * 2); y += deshake->blocksize * 2) {
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// We use a width of 16 here to match the libavcodec sad functions
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for (x = deshake->rx; x < width - deshake->rx - 16; x += 16) {
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// If the contrast is too low, just skip this block as it probably
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// won't be very useful to us.
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contrast = block_contrast(src2, x, y, stride, deshake->blocksize);
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if (contrast > deshake->contrast) {
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//av_log(NULL, AV_LOG_ERROR, "%d\n", contrast);
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find_block_motion(deshake, src1, src2, x, y, stride, &mv);
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if (mv.x != -1 && mv.y != -1) {
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counts[mv.x + deshake->rx][mv.y + deshake->ry] += 1;
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if (x > deshake->rx && y > deshake->ry)
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angles[pos++] = block_angle(x, y, 0, 0, &mv);
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center_x += mv.x;
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center_y += mv.y;
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}
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}
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}
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}
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if (pos) {
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center_x /= pos;
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center_y /= pos;
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t->angle = clean_mean(angles, pos);
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if (t->angle < 0.001)
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t->angle = 0;
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} else {
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t->angle = 0;
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}
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// Find the most common motion vector in the frame and use it as the gmv
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for (y = deshake->ry * 2; y >= 0; y--) {
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for (x = 0; x < deshake->rx * 2 + 1; x++) {
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//av_log(NULL, AV_LOG_ERROR, "%5d ", counts[x][y]);
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if (counts[x][y] > count_max_value) {
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t->vector.x = x - deshake->rx;
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t->vector.y = y - deshake->ry;
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count_max_value = counts[x][y];
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}
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}
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//av_log(NULL, AV_LOG_ERROR, "\n");
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}
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p_x = (center_x - width / 2);
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p_y = (center_y - height / 2);
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t->vector.x += (cos(t->angle)-1)*p_x - sin(t->angle)*p_y;
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t->vector.y += sin(t->angle)*p_x + (cos(t->angle)-1)*p_y;
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// Clamp max shift & rotation?
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t->vector.x = av_clipf(t->vector.x, -deshake->rx * 2, deshake->rx * 2);
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t->vector.y = av_clipf(t->vector.y, -deshake->ry * 2, deshake->ry * 2);
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t->angle = av_clipf(t->angle, -0.1, 0.1);
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//av_log(NULL, AV_LOG_ERROR, "%d x %d\n", avg->x, avg->y);
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av_free(angles);
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}
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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DeshakeContext *deshake = ctx->priv;
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char filename[256] = {0};
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deshake->rx = 16;
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deshake->ry = 16;
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deshake->edge = FILL_MIRROR;
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deshake->blocksize = 8;
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deshake->contrast = 125;
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deshake->search = EXHAUSTIVE;
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deshake->refcount = 20;
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deshake->cw = -1;
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deshake->ch = -1;
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deshake->cx = -1;
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deshake->cy = -1;
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if (args) {
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sscanf(args, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%255s",
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&deshake->cx, &deshake->cy, &deshake->cw, &deshake->ch,
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&deshake->rx, &deshake->ry, (int *)&deshake->edge,
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&deshake->blocksize, &deshake->contrast, (int *)&deshake->search, filename);
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deshake->blocksize /= 2;
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deshake->rx = av_clip(deshake->rx, 0, 64);
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deshake->ry = av_clip(deshake->ry, 0, 64);
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deshake->edge = av_clip(deshake->edge, FILL_BLANK, FILL_COUNT - 1);
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deshake->blocksize = av_clip(deshake->blocksize, 4, 128);
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deshake->contrast = av_clip(deshake->contrast, 1, 255);
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deshake->search = av_clip(deshake->search, EXHAUSTIVE, SEARCH_COUNT - 1);
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}
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if (*filename)
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deshake->fp = fopen(filename, "w");
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if (deshake->fp)
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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);
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// Quadword align left edge of box for MMX code, adjust width if necessary
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// to keep right margin
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if (deshake->cx > 0) {
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deshake->cw += deshake->cx - (deshake->cx & ~15);
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deshake->cx &= ~15;
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}
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av_log(ctx, AV_LOG_INFO, "cx: %d, cy: %d, cw: %d, ch: %d, rx: %d, ry: %d, edge: %d blocksize: %d contrast: %d search: %d\n",
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deshake->cx, deshake->cy, deshake->cw, deshake->ch,
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deshake->rx, deshake->ry, deshake->edge, deshake->blocksize * 2, deshake->contrast, deshake->search);
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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enum PixelFormat pix_fmts[] = {
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PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_YUV410P,
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PIX_FMT_YUV411P, PIX_FMT_YUV440P, PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_props(AVFilterLink *link)
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{
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DeshakeContext *deshake = link->dst->priv;
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deshake->ref = NULL;
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deshake->last.vector.x = 0;
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deshake->last.vector.y = 0;
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deshake->last.angle = 0;
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deshake->last.zoom = 0;
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deshake->avctx = avcodec_alloc_context3(NULL);
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dsputil_init(&deshake->c, deshake->avctx);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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DeshakeContext *deshake = ctx->priv;
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avfilter_unref_buffer(deshake->ref);
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if (deshake->fp)
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fclose(deshake->fp);
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avcodec_close(deshake->avctx);
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av_freep(&deshake->avctx);
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}
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static void end_frame(AVFilterLink *link)
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{
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DeshakeContext *deshake = link->dst->priv;
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AVFilterBufferRef *in = link->cur_buf;
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AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
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Transform t = {{0},0}, orig = {{0},0};
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float matrix[9];
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float alpha = 2.0 / deshake->refcount;
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char tmp[256];
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if (deshake->cx < 0 || deshake->cy < 0 || deshake->cw < 0 || deshake->ch < 0) {
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// Find the most likely global motion for the current frame
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find_motion(deshake, (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0], in->data[0], link->w, link->h, in->linesize[0], &t);
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} else {
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uint8_t *src1 = (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0];
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uint8_t *src2 = in->data[0];
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deshake->cx = FFMIN(deshake->cx, link->w);
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deshake->cy = FFMIN(deshake->cy, link->h);
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if ((unsigned)deshake->cx + (unsigned)deshake->cw > link->w) deshake->cw = link->w - deshake->cx;
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if ((unsigned)deshake->cy + (unsigned)deshake->ch > link->h) deshake->ch = link->h - deshake->cy;
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// Quadword align right margin
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deshake->cw &= ~15;
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src1 += deshake->cy * in->linesize[0] + deshake->cx;
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src2 += deshake->cy * in->linesize[0] + deshake->cx;
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find_motion(deshake, src1, src2, deshake->cw, deshake->ch, in->linesize[0], &t);
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}
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// Copy transform so we can output it later to compare to the smoothed value
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orig.vector.x = t.vector.x;
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orig.vector.y = t.vector.y;
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orig.angle = t.angle;
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orig.zoom = t.zoom;
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// Generate a one-sided moving exponential average
|
|
deshake->avg.vector.x = alpha * t.vector.x + (1.0 - alpha) * deshake->avg.vector.x;
|
|
deshake->avg.vector.y = alpha * t.vector.y + (1.0 - alpha) * deshake->avg.vector.y;
|
|
deshake->avg.angle = alpha * t.angle + (1.0 - alpha) * deshake->avg.angle;
|
|
deshake->avg.zoom = alpha * t.zoom + (1.0 - alpha) * deshake->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 -= deshake->avg.vector.x;
|
|
t.vector.y -= deshake->avg.vector.y;
|
|
t.angle -= deshake->avg.angle;
|
|
t.zoom -= deshake->avg.zoom;
|
|
|
|
// Invert the motion to undo it
|
|
t.vector.x *= -1;
|
|
t.vector.y *= -1;
|
|
t.angle *= -1;
|
|
|
|
// Write statistics to file
|
|
if (deshake->fp) {
|
|
snprintf(tmp, 256, "%f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f\n", orig.vector.x, deshake->avg.vector.x, t.vector.x, orig.vector.y, deshake->avg.vector.y, t.vector.y, orig.angle, deshake->avg.angle, t.angle, orig.zoom, deshake->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
|
|
ff_draw_slice(link->dst->outputs[0], 0, link->h, 1);
|
|
ff_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 = (const 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 = (const AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO, },
|
|
{ .name = NULL}},
|
|
};
|