/* * Original copyright (c) 2002 Remi Guyomarch * Port copyright (c) 2010 Daniel G. Taylor * Relicensed to the LGPL with permission from Remi Guyomarch. * * 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 * blur / sharpen filter, ported to FFmpeg from MPlayer * libmpcodecs/unsharp.c. * * This code is based on: * * An Efficient algorithm for Gaussian blur using finite-state machines * Frederick M. Waltz and John W. V. Miller * * SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII * Originally published Boston, Nov 98 * * http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf */ #include /* DBL_MAX */ #include "avfilter.h" #include "formats.h" #include "internal.h" #include "video.h" #include "libavutil/common.h" #include "libavutil/mem.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #define MIN_MATRIX_SIZE 3 #define MAX_MATRIX_SIZE 63 /* right-shift and round-up */ #define SHIFTUP(x,shift) (-((-(x))>>(shift))) typedef struct FilterParam { int msize_x; ///< matrix width int msize_y; ///< matrix height int amount; ///< effect amount int steps_x; ///< horizontal step count int steps_y; ///< vertical step count int scalebits; ///< bits to shift pixel int32_t halfscale; ///< amount to add to pixel uint32_t *sc[MAX_MATRIX_SIZE - 1]; ///< finite state machine storage } FilterParam; typedef struct { const AVClass *class; FilterParam luma; ///< luma parameters (width, height, amount) FilterParam chroma; ///< chroma parameters (width, height, amount) int hsub, vsub; int luma_msize_x, luma_msize_y, chroma_msize_x, chroma_msize_y; double luma_amount, chroma_amount; } UnsharpContext; #define OFFSET(x) offsetof(UnsharpContext, x) static const AVOption unsharp_options[] = { { "luma_msize_x", "set luma matrix x size", OFFSET(luma_msize_x), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 }, { "lx", "set luma matrix x size", OFFSET(luma_msize_x), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 }, { "luma_msize_y", "set luma matrix y size", OFFSET(luma_msize_y), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 }, { "ly", "set luma matrix y size", OFFSET(luma_msize_y), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 }, { "luma_amount", "set luma effect amount", OFFSET(luma_amount), AV_OPT_TYPE_DOUBLE, {.dbl=1.0}, -DBL_MAX, DBL_MAX }, { "la", "set luma effect amount", OFFSET(luma_amount), AV_OPT_TYPE_DOUBLE, {.dbl=1.0}, -DBL_MAX, DBL_MAX }, { "chroma_msize_x", "set chroma matrix x size", OFFSET(chroma_msize_x), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 }, { "cx", "set chroma matrix x size", OFFSET(chroma_msize_x), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 }, { "chroma_msize_y", "set chroma matrix y size", OFFSET(chroma_msize_y), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 }, { "cy" , "set chroma matrix y size", OFFSET(chroma_msize_y), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 }, { "chroma_amount", "set chroma effect strenght", OFFSET(chroma_amount), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -DBL_MAX, DBL_MAX }, { "ca", "set chroma effect strenght", OFFSET(chroma_amount), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -DBL_MAX, DBL_MAX }, { NULL } }; AVFILTER_DEFINE_CLASS(unsharp); static void apply_unsharp( uint8_t *dst, int dst_stride, const uint8_t *src, int src_stride, int width, int height, FilterParam *fp) { uint32_t **sc = fp->sc; uint32_t sr[MAX_MATRIX_SIZE - 1], tmp1, tmp2; int32_t res; int x, y, z; const uint8_t *src2 = NULL; //silence a warning const int amount = fp->amount; const int steps_x = fp->steps_x; const int steps_y = fp->steps_y; const int scalebits = fp->scalebits; const int32_t halfscale = fp->halfscale; if (!amount) { if (dst_stride == src_stride) memcpy(dst, src, src_stride * height); else for (y = 0; y < height; y++, dst += dst_stride, src += src_stride) memcpy(dst, src, width); return; } for (y = 0; y < 2 * steps_y; y++) memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * steps_x)); for (y = -steps_y; y < height + steps_y; y++) { if (y < height) src2 = src; memset(sr, 0, sizeof(sr[0]) * (2 * steps_x - 1)); for (x = -steps_x; x < width + steps_x; x++) { tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x]; for (z = 0; z < steps_x * 2; z += 2) { tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1; tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2; } for (z = 0; z < steps_y * 2; z += 2) { tmp2 = sc[z + 0][x + steps_x] + tmp1; sc[z + 0][x + steps_x] = tmp1; tmp1 = sc[z + 1][x + steps_x] + tmp2; sc[z + 1][x + steps_x] = tmp2; } if (x >= steps_x && y >= steps_y) { const uint8_t *srx = src - steps_y * src_stride + x - steps_x; uint8_t *dsx = dst - steps_y * dst_stride + x - steps_x; res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + halfscale) >> scalebits)) * amount) >> 16); *dsx = av_clip_uint8(res); } } if (y >= 0) { dst += dst_stride; src += src_stride; } } } static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount) { fp->msize_x = msize_x; fp->msize_y = msize_y; fp->amount = amount * 65536.0; fp->steps_x = msize_x / 2; fp->steps_y = msize_y / 2; fp->scalebits = (fp->steps_x + fp->steps_y) * 2; fp->halfscale = 1 << (fp->scalebits - 1); } static av_cold int init(AVFilterContext *ctx, const char *args) { UnsharpContext *unsharp = ctx->priv; static const char *shorthand[] = { "luma_msize_x", "luma_msize_y", "luma_amount", "chroma_msize_x", "chroma_msize_y", "chroma_amount", NULL }; int ret; unsharp->class = &unsharp_class; av_opt_set_defaults(unsharp); if ((ret = av_opt_set_from_string(unsharp, args, shorthand, "=", ":")) < 0) return ret; set_filter_param(&unsharp->luma, unsharp->luma_msize_x, unsharp->luma_msize_y, unsharp->luma_amount); set_filter_param(&unsharp->chroma, unsharp->chroma_msize_x, unsharp->chroma_msize_y, unsharp->chroma_amount); return 0; } static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE }; ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); return 0; } static int init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width) { int z; const char *effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen"; if (!(fp->msize_x & fp->msize_y & 1)) { av_log(ctx, AV_LOG_ERROR, "Invalid even size for %s matrix size %dx%d\n", effect_type, fp->msize_x, fp->msize_y); return AVERROR(EINVAL); } av_log(ctx, AV_LOG_VERBOSE, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n", effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0); for (z = 0; z < 2 * fp->steps_y; z++) if (!(fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x)))) return AVERROR(ENOMEM); return 0; } static int config_props(AVFilterLink *link) { UnsharpContext *unsharp = link->dst->priv; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format); int ret; unsharp->hsub = desc->log2_chroma_w; unsharp->vsub = desc->log2_chroma_h; ret = init_filter_param(link->dst, &unsharp->luma, "luma", link->w); if (ret < 0) return ret; ret = init_filter_param(link->dst, &unsharp->chroma, "chroma", SHIFTUP(link->w, unsharp->hsub)); if (ret < 0) return ret; return 0; } static void free_filter_param(FilterParam *fp) { int z; for (z = 0; z < 2 * fp->steps_y; z++) av_free(fp->sc[z]); } static av_cold void uninit(AVFilterContext *ctx) { UnsharpContext *unsharp = ctx->priv; free_filter_param(&unsharp->luma); free_filter_param(&unsharp->chroma); av_opt_free(unsharp); } static int filter_frame(AVFilterLink *link, AVFilterBufferRef *in) { UnsharpContext *unsharp = link->dst->priv; AVFilterLink *outlink = link->dst->outputs[0]; AVFilterBufferRef *out; int cw = SHIFTUP(link->w, unsharp->hsub); int ch = SHIFTUP(link->h, unsharp->vsub); out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); if (!out) { avfilter_unref_bufferp(&in); return AVERROR(ENOMEM); } avfilter_copy_buffer_ref_props(out, in); apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma); apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw, ch, &unsharp->chroma); apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw, ch, &unsharp->chroma); avfilter_unref_bufferp(&in); return ff_filter_frame(outlink, out); } static const AVFilterPad avfilter_vf_unsharp_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, .config_props = config_props, .min_perms = AV_PERM_READ, }, { NULL } }; static const AVFilterPad avfilter_vf_unsharp_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter avfilter_vf_unsharp = { .name = "unsharp", .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."), .priv_size = sizeof(UnsharpContext), .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = avfilter_vf_unsharp_inputs, .outputs = avfilter_vf_unsharp_outputs, .priv_class = &unsharp_class, };