mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
31a373ce71
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
556 lines
20 KiB
C
556 lines
20 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 "internal.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/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/qsort.h"
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#include "deshake.h"
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#define OFFSET(x) offsetof(DeshakeContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption deshake_options[] = {
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{ "x", "set x for the rectangular search area", OFFSET(cx), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "y", "set y for the rectangular search area", OFFSET(cy), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "w", "set width for the rectangular search area", OFFSET(cw), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "h", "set height for the rectangular search area", OFFSET(ch), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "rx", "set x for the rectangular search area", OFFSET(rx), AV_OPT_TYPE_INT, {.i64=16}, 0, MAX_R, .flags = FLAGS },
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{ "ry", "set y for the rectangular search area", OFFSET(ry), AV_OPT_TYPE_INT, {.i64=16}, 0, MAX_R, .flags = FLAGS },
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{ "edge", "set edge mode", OFFSET(edge), AV_OPT_TYPE_INT, {.i64=FILL_MIRROR}, FILL_BLANK, FILL_COUNT-1, FLAGS, "edge"},
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{ "blank", "fill zeroes at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_BLANK}, INT_MIN, INT_MAX, FLAGS, "edge" },
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{ "original", "original image at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_ORIGINAL}, INT_MIN, INT_MAX, FLAGS, "edge" },
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{ "clamp", "extruded edge value at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_CLAMP}, INT_MIN, INT_MAX, FLAGS, "edge" },
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{ "mirror", "mirrored edge at blank locations", 0, AV_OPT_TYPE_CONST, {.i64=FILL_MIRROR}, INT_MIN, INT_MAX, FLAGS, "edge" },
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{ "blocksize", "set motion search blocksize", OFFSET(blocksize), AV_OPT_TYPE_INT, {.i64=8}, 4, 128, .flags = FLAGS },
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{ "contrast", "set contrast threshold for blocks", OFFSET(contrast), AV_OPT_TYPE_INT, {.i64=125}, 1, 255, .flags = FLAGS },
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{ "search", "set search strategy", OFFSET(search), AV_OPT_TYPE_INT, {.i64=EXHAUSTIVE}, EXHAUSTIVE, SEARCH_COUNT-1, FLAGS, "smode" },
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{ "exhaustive", "exhaustive search", 0, AV_OPT_TYPE_CONST, {.i64=EXHAUSTIVE}, INT_MIN, INT_MAX, FLAGS, "smode" },
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{ "less", "less exhaustive search", 0, AV_OPT_TYPE_CONST, {.i64=SMART_EXHAUSTIVE}, INT_MIN, INT_MAX, FLAGS, "smode" },
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{ "filename", "set motion search detailed log file name", OFFSET(filename), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "opencl", "ignored", OFFSET(opencl), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(deshake);
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static int cmp(const void *a, const void *b)
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{
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return FFDIFFSIGN(*(const double *)a, *(const double *)b);
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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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AV_QSORT(values, count, double, 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->sad(src1 + cy * stride + cx, stride,\
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src2 + (j) * stride + (i), stride)
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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; y += 2) {
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for (x = -deshake->rx + 1; x < deshake->rx; 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 = 255;
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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 sad function
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for (j = 0; j <= 15; j++) {
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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 count_max_value = 0;
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int contrast;
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int pos;
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int center_x = 0, center_y = 0;
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double p_x, p_y;
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av_fast_malloc(&deshake->angles, &deshake->angles_size, width * height / (16 * deshake->blocksize) * sizeof(*deshake->angles));
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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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deshake->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 sad function
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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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deshake->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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deshake->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(deshake->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 ", deshake->counts[x][y]);
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if (deshake->counts[x][y] > count_max_value) {
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t->vec.x = x - deshake->rx;
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t->vec.y = y - deshake->ry;
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count_max_value = deshake->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 / 2.0);
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p_y = (center_y - height / 2.0);
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t->vec.x += (cos(t->angle)-1)*p_x - sin(t->angle)*p_y;
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t->vec.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->vec.x = av_clipf(t->vec.x, -deshake->rx * 2, deshake->rx * 2);
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t->vec.y = av_clipf(t->vec.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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}
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static int deshake_transform_c(AVFilterContext *ctx,
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int width, int height, int cw, int ch,
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const float *matrix_y, const float *matrix_uv,
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enum InterpolateMethod interpolate,
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enum FillMethod fill, AVFrame *in, AVFrame *out)
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{
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int i = 0, ret = 0;
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const float *matrixs[3];
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int plane_w[3], plane_h[3];
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matrixs[0] = matrix_y;
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matrixs[1] = matrixs[2] = matrix_uv;
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plane_w[0] = width;
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plane_w[1] = plane_w[2] = cw;
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plane_h[0] = height;
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plane_h[1] = plane_h[2] = ch;
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for (i = 0; i < 3; i++) {
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// Transform the luma and chroma planes
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ret = ff_affine_transform(in->data[i], out->data[i], in->linesize[i],
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out->linesize[i], plane_w[i], plane_h[i],
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matrixs[i], interpolate, fill);
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if (ret < 0)
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return ret;
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}
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return ret;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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DeshakeContext *deshake = ctx->priv;
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deshake->refcount = 20; // XXX: add to options?
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deshake->blocksize /= 2;
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deshake->blocksize = av_clip(deshake->blocksize, 4, 128);
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if (deshake->rx % 16) {
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av_log(ctx, AV_LOG_ERROR, "rx must be a multiple of 16\n");
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return AVERROR_PATCHWELCOME;
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}
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if (deshake->filename)
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deshake->fp = fopen(deshake->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", 1, 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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deshake->transform = deshake_transform_c;
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av_log(ctx, AV_LOG_VERBOSE, "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 const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
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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.vec.x = 0;
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deshake->last.vec.y = 0;
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deshake->last.angle = 0;
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deshake->last.zoom = 0;
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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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av_frame_free(&deshake->ref);
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av_freep(&deshake->angles);
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deshake->angles_size = 0;
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if (deshake->fp)
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fclose(deshake->fp);
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}
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static int filter_frame(AVFilterLink *link, AVFrame *in)
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{
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DeshakeContext *deshake = link->dst->priv;
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AVFilterLink *outlink = link->dst->outputs[0];
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AVFrame *out;
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Transform t = {{0},0}, orig = {{0},0};
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float matrix_y[9], matrix_uv[9];
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float alpha = 2.0 / deshake->refcount;
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char tmp[256];
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int ret = 0;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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const int chroma_width = AV_CEIL_RSHIFT(link->w, desc->log2_chroma_w);
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const int chroma_height = AV_CEIL_RSHIFT(link->h, desc->log2_chroma_h);
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int aligned;
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float transform_zoom;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
|
|
}
|
|
av_frame_copy_props(out, in);
|
|
|
|
aligned = !((intptr_t)in->data[0] & 15 | in->linesize[0] & 15);
|
|
deshake->sad = av_pixelutils_get_sad_fn(4, 4, aligned, deshake); // 16x16, 2nd source unaligned
|
|
if (!deshake->sad)
|
|
return AVERROR(EINVAL);
|
|
|
|
if (deshake->cx < 0 || deshake->cy < 0 || deshake->cw < 0 || deshake->ch < 0) {
|
|
// 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);
|
|
} else {
|
|
uint8_t *src1 = (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0];
|
|
uint8_t *src2 = in->data[0];
|
|
|
|
deshake->cx = FFMIN(deshake->cx, link->w);
|
|
deshake->cy = FFMIN(deshake->cy, link->h);
|
|
|
|
if ((unsigned)deshake->cx + (unsigned)deshake->cw > link->w) deshake->cw = link->w - deshake->cx;
|
|
if ((unsigned)deshake->cy + (unsigned)deshake->ch > link->h) deshake->ch = link->h - deshake->cy;
|
|
|
|
// Quadword align right margin
|
|
deshake->cw &= ~15;
|
|
|
|
src1 += deshake->cy * in->linesize[0] + deshake->cx;
|
|
src2 += deshake->cy * in->linesize[0] + deshake->cx;
|
|
|
|
find_motion(deshake, src1, src2, deshake->cw, deshake->ch, in->linesize[0], &t);
|
|
}
|
|
|
|
|
|
// Copy transform so we can output it later to compare to the smoothed value
|
|
orig.vec.x = t.vec.x;
|
|
orig.vec.y = t.vec.y;
|
|
orig.angle = t.angle;
|
|
orig.zoom = t.zoom;
|
|
|
|
// Generate a one-sided moving exponential average
|
|
deshake->avg.vec.x = alpha * t.vec.x + (1.0 - alpha) * deshake->avg.vec.x;
|
|
deshake->avg.vec.y = alpha * t.vec.y + (1.0 - alpha) * deshake->avg.vec.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.vec.x -= deshake->avg.vec.x;
|
|
t.vec.y -= deshake->avg.vec.y;
|
|
t.angle -= deshake->avg.angle;
|
|
t.zoom -= deshake->avg.zoom;
|
|
|
|
// Invert the motion to undo it
|
|
t.vec.x *= -1;
|
|
t.vec.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.vec.x, deshake->avg.vec.x, t.vec.x, orig.vec.y, deshake->avg.vec.y, t.vec.y, orig.angle, deshake->avg.angle, t.angle, orig.zoom, deshake->avg.zoom, t.zoom);
|
|
fwrite(tmp, 1, strlen(tmp), deshake->fp);
|
|
}
|
|
|
|
// Turn relative current frame motion into absolute by adding it to the
|
|
// last absolute motion
|
|
t.vec.x += deshake->last.vec.x;
|
|
t.vec.y += deshake->last.vec.y;
|
|
t.angle += deshake->last.angle;
|
|
t.zoom += deshake->last.zoom;
|
|
|
|
// Shrink motion by 10% to keep things centered in the camera frame
|
|
t.vec.x *= 0.9;
|
|
t.vec.y *= 0.9;
|
|
t.angle *= 0.9;
|
|
|
|
// Store the last absolute motion information
|
|
deshake->last.vec.x = t.vec.x;
|
|
deshake->last.vec.y = t.vec.y;
|
|
deshake->last.angle = t.angle;
|
|
deshake->last.zoom = t.zoom;
|
|
|
|
transform_zoom = 1.0 + t.zoom / 100.0;
|
|
|
|
// Generate a luma transformation matrix
|
|
ff_get_matrix(t.vec.x, t.vec.y, t.angle, transform_zoom, transform_zoom, matrix_y);
|
|
// Generate a chroma transformation matrix
|
|
ff_get_matrix(t.vec.x / (link->w / chroma_width), t.vec.y / (link->h / chroma_height), t.angle, transform_zoom, transform_zoom, matrix_uv);
|
|
// Transform the luma and chroma planes
|
|
ret = deshake->transform(link->dst, link->w, link->h, chroma_width, chroma_height,
|
|
matrix_y, matrix_uv, INTERPOLATE_BILINEAR, deshake->edge, in, out);
|
|
|
|
// Cleanup the old reference frame
|
|
av_frame_free(&deshake->ref);
|
|
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
// Store the current frame as the reference frame for calculating the
|
|
// motion of the next frame
|
|
deshake->ref = in;
|
|
|
|
return ff_filter_frame(outlink, out);
|
|
fail:
|
|
av_frame_free(&out);
|
|
return ret;
|
|
}
|
|
|
|
static const AVFilterPad deshake_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.filter_frame = filter_frame,
|
|
.config_props = config_props,
|
|
},
|
|
};
|
|
|
|
static const AVFilterPad deshake_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},
|
|
};
|
|
|
|
const AVFilter ff_vf_deshake = {
|
|
.name = "deshake",
|
|
.description = NULL_IF_CONFIG_SMALL("Stabilize shaky video."),
|
|
.priv_size = sizeof(DeshakeContext),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
FILTER_INPUTS(deshake_inputs),
|
|
FILTER_OUTPUTS(deshake_outputs),
|
|
FILTER_PIXFMTS_ARRAY(pix_fmts),
|
|
.priv_class = &deshake_class,
|
|
};
|