Libav 0.7.1
libavfilter/vf_unsharp.c
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00001 /*
00002  * Original copyright (c) 2002 Remi Guyomarch <rguyom@pobox.com>
00003  * Port copyright (c) 2010 Daniel G. Taylor <dan@programmer-art.org>
00004  * Relicensed to the LGPL with permission from Remi Guyomarch.
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00039 #include "avfilter.h"
00040 #include "libavutil/common.h"
00041 #include "libavutil/mem.h"
00042 #include "libavutil/pixdesc.h"
00043 
00044 #define MIN_SIZE 3
00045 #define MAX_SIZE 13
00046 
00047 #define CHROMA_WIDTH(link)  -((-link->w) >> av_pix_fmt_descriptors[link->format].log2_chroma_w)
00048 #define CHROMA_HEIGHT(link) -((-link->h) >> av_pix_fmt_descriptors[link->format].log2_chroma_h)
00049 
00050 typedef struct FilterParam {
00051     int msize_x;                             
00052     int msize_y;                             
00053     int amount;                              
00054     int steps_x;                             
00055     int steps_y;                             
00056     int scalebits;                           
00057     int32_t halfscale;                       
00058     uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1]; 
00059 } FilterParam;
00060 
00061 typedef struct {
00062     FilterParam luma;   
00063     FilterParam chroma; 
00064 } UnsharpContext;
00065 
00066 static void unsharpen(uint8_t *dst, uint8_t *src, int dst_stride, int src_stride, int width, int height, FilterParam *fp)
00067 {
00068     uint32_t **sc = fp->sc;
00069     uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;
00070 
00071     int32_t res;
00072     int x, y, z;
00073 
00074     if (!fp->amount) {
00075         if (dst_stride == src_stride)
00076             memcpy(dst, src, src_stride * height);
00077         else
00078             for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
00079                 memcpy(dst, src, width);
00080         return;
00081     }
00082 
00083     for (y = 0; y < 2 * fp->steps_y; y++)
00084         memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
00085 
00086     for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
00087         memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
00088         for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
00089             tmp1 = x <= 0 ? src[0] : x >= width ? src[width-1] : src[x];
00090             for (z = 0; z < fp->steps_x * 2; z += 2) {
00091                 tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
00092                 tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
00093             }
00094             for (z = 0; z < fp->steps_y * 2; z += 2) {
00095                 tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
00096                 tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
00097             }
00098             if (x >= fp->steps_x && y >= fp->steps_y) {
00099                 uint8_t* srx = src - fp->steps_y * src_stride + x - fp->steps_x;
00100                 uint8_t* dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
00101 
00102                 res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
00103                 *dsx = av_clip_uint8(res);
00104             }
00105         }
00106         if (y >= 0) {
00107             dst += dst_stride;
00108             src += src_stride;
00109         }
00110     }
00111 }
00112 
00113 static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
00114 {
00115     fp->msize_x = msize_x;
00116     fp->msize_y = msize_y;
00117     fp->amount = amount * 65536.0;
00118 
00119     fp->steps_x = msize_x / 2;
00120     fp->steps_y = msize_y / 2;
00121     fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
00122     fp->halfscale = 1 << (fp->scalebits - 1);
00123 }
00124 
00125 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00126 {
00127     UnsharpContext *unsharp = ctx->priv;
00128     int lmsize_x = 5, cmsize_x = 0;
00129     int lmsize_y = 5, cmsize_y = 0;
00130     double lamount = 1.0f, camount = 0.0f;
00131 
00132     if (args)
00133         sscanf(args, "%d:%d:%lf:%d:%d:%lf", &lmsize_x, &lmsize_y, &lamount,
00134                                             &cmsize_x, &cmsize_y, &camount);
00135 
00136     if ((lamount && (lmsize_x < 2 || lmsize_y < 2)) ||
00137         (camount && (cmsize_x < 2 || cmsize_y < 2))) {
00138         av_log(ctx, AV_LOG_ERROR,
00139                "Invalid value <2 for lmsize_x:%d or lmsize_y:%d or cmsize_x:%d or cmsize_y:%d\n",
00140                lmsize_x, lmsize_y, cmsize_x, cmsize_y);
00141         return AVERROR(EINVAL);
00142     }
00143 
00144     set_filter_param(&unsharp->luma,   lmsize_x, lmsize_y, lamount);
00145     set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount);
00146 
00147     return 0;
00148 }
00149 
00150 static int query_formats(AVFilterContext *ctx)
00151 {
00152     enum PixelFormat pix_fmts[] = {
00153         PIX_FMT_YUV420P,  PIX_FMT_YUV422P,  PIX_FMT_YUV444P,  PIX_FMT_YUV410P,
00154         PIX_FMT_YUV411P,  PIX_FMT_YUV440P,  PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P,
00155         PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
00156     };
00157 
00158     avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
00159 
00160     return 0;
00161 }
00162 
00163 static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
00164 {
00165     int z;
00166     const char *effect;
00167 
00168     effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
00169 
00170     av_log(ctx, AV_LOG_INFO, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
00171            effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
00172 
00173     for (z = 0; z < 2 * fp->steps_y; z++)
00174         fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
00175 }
00176 
00177 static int config_props(AVFilterLink *link)
00178 {
00179     UnsharpContext *unsharp = link->dst->priv;
00180 
00181     init_filter_param(link->dst, &unsharp->luma,   "luma",   link->w);
00182     init_filter_param(link->dst, &unsharp->chroma, "chroma", CHROMA_WIDTH(link));
00183 
00184     return 0;
00185 }
00186 
00187 static void free_filter_param(FilterParam *fp)
00188 {
00189     int z;
00190 
00191     for (z = 0; z < 2 * fp->steps_y; z++)
00192         av_free(fp->sc[z]);
00193 }
00194 
00195 static av_cold void uninit(AVFilterContext *ctx)
00196 {
00197     UnsharpContext *unsharp = ctx->priv;
00198 
00199     free_filter_param(&unsharp->luma);
00200     free_filter_param(&unsharp->chroma);
00201 }
00202 
00203 static void end_frame(AVFilterLink *link)
00204 {
00205     UnsharpContext *unsharp = link->dst->priv;
00206     AVFilterBufferRef *in  = link->cur_buf;
00207     AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
00208 
00209     unsharpen(out->data[0], in->data[0], out->linesize[0], in->linesize[0], link->w,            link->h,             &unsharp->luma);
00210     unsharpen(out->data[1], in->data[1], out->linesize[1], in->linesize[1], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma);
00211     unsharpen(out->data[2], in->data[2], out->linesize[2], in->linesize[2], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma);
00212 
00213     avfilter_unref_buffer(in);
00214     avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
00215     avfilter_end_frame(link->dst->outputs[0]);
00216     avfilter_unref_buffer(out);
00217 }
00218 
00219 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
00220 {
00221 }
00222 
00223 AVFilter avfilter_vf_unsharp = {
00224     .name      = "unsharp",
00225     .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
00226 
00227     .priv_size = sizeof(UnsharpContext),
00228 
00229     .init = init,
00230     .uninit = uninit,
00231     .query_formats = query_formats,
00232 
00233     .inputs    = (AVFilterPad[]) {{ .name             = "default",
00234                                     .type             = AVMEDIA_TYPE_VIDEO,
00235                                     .draw_slice       = draw_slice,
00236                                     .end_frame        = end_frame,
00237                                     .config_props     = config_props,
00238                                     .min_perms        = AV_PERM_READ, },
00239                                   { .name = NULL}},
00240 
00241     .outputs   = (AVFilterPad[]) {{ .name             = "default",
00242                                     .type             = AVMEDIA_TYPE_VIDEO, },
00243                                   { .name = NULL}},
00244 };