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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 FFmpeg.
00007  *
00008  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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, const 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     const uint8_t *src2;
00074 
00075     if (!fp->amount) {
00076         if (dst_stride == src_stride)
00077             memcpy(dst, src, src_stride * height);
00078         else
00079             for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
00080                 memcpy(dst, src, width);
00081         return;
00082     }
00083 
00084     for (y = 0; y < 2 * fp->steps_y; y++)
00085         memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
00086 
00087     for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
00088         if (y < height)
00089             src2 = src;
00090 
00091         memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
00092         for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
00093             tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
00094             for (z = 0; z < fp->steps_x * 2; z += 2) {
00095                 tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
00096                 tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
00097             }
00098             for (z = 0; z < fp->steps_y * 2; z += 2) {
00099                 tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
00100                 tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
00101             }
00102             if (x >= fp->steps_x && y >= fp->steps_y) {
00103                 const uint8_t* srx = src - fp->steps_y * src_stride + x - fp->steps_x;
00104                 uint8_t* dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
00105 
00106                 res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
00107                 *dsx = av_clip_uint8(res);
00108             }
00109         }
00110         if (y >= 0) {
00111             dst += dst_stride;
00112             src += src_stride;
00113         }
00114     }
00115 }
00116 
00117 static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
00118 {
00119     fp->msize_x = msize_x;
00120     fp->msize_y = msize_y;
00121     fp->amount = amount * 65536.0;
00122 
00123     fp->steps_x = msize_x / 2;
00124     fp->steps_y = msize_y / 2;
00125     fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
00126     fp->halfscale = 1 << (fp->scalebits - 1);
00127 }
00128 
00129 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00130 {
00131     UnsharpContext *unsharp = ctx->priv;
00132     int lmsize_x = 5, cmsize_x = 5;
00133     int lmsize_y = 5, cmsize_y = 5;
00134     double lamount = 1.0f, camount = 0.0f;
00135 
00136     if (args)
00137         sscanf(args, "%d:%d:%lf:%d:%d:%lf", &lmsize_x, &lmsize_y, &lamount,
00138                                             &cmsize_x, &cmsize_y, &camount);
00139 
00140     if ((lamount && (lmsize_x < 2 || lmsize_y < 2)) ||
00141         (camount && (cmsize_x < 2 || cmsize_y < 2))) {
00142         av_log(ctx, AV_LOG_ERROR,
00143                "Invalid value <2 for lmsize_x:%d or lmsize_y:%d or cmsize_x:%d or cmsize_y:%d\n",
00144                lmsize_x, lmsize_y, cmsize_x, cmsize_y);
00145         return AVERROR(EINVAL);
00146     }
00147 
00148     set_filter_param(&unsharp->luma,   lmsize_x, lmsize_y, lamount);
00149     set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount);
00150 
00151     return 0;
00152 }
00153 
00154 static int query_formats(AVFilterContext *ctx)
00155 {
00156     enum PixelFormat pix_fmts[] = {
00157         PIX_FMT_YUV420P,  PIX_FMT_YUV422P,  PIX_FMT_YUV444P,  PIX_FMT_YUV410P,
00158         PIX_FMT_YUV411P,  PIX_FMT_YUV440P,  PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P,
00159         PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P, PIX_FMT_NONE
00160     };
00161 
00162     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00163 
00164     return 0;
00165 }
00166 
00167 static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
00168 {
00169     int z;
00170     const char *effect;
00171 
00172     effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
00173 
00174     av_log(ctx, AV_LOG_INFO, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
00175            effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
00176 
00177     for (z = 0; z < 2 * fp->steps_y; z++)
00178         fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
00179 }
00180 
00181 static int config_props(AVFilterLink *link)
00182 {
00183     UnsharpContext *unsharp = link->dst->priv;
00184 
00185     init_filter_param(link->dst, &unsharp->luma,   "luma",   link->w);
00186     init_filter_param(link->dst, &unsharp->chroma, "chroma", CHROMA_WIDTH(link));
00187 
00188     return 0;
00189 }
00190 
00191 static void free_filter_param(FilterParam *fp)
00192 {
00193     int z;
00194 
00195     for (z = 0; z < 2 * fp->steps_y; z++)
00196         av_free(fp->sc[z]);
00197 }
00198 
00199 static av_cold void uninit(AVFilterContext *ctx)
00200 {
00201     UnsharpContext *unsharp = ctx->priv;
00202 
00203     free_filter_param(&unsharp->luma);
00204     free_filter_param(&unsharp->chroma);
00205 }
00206 
00207 static void end_frame(AVFilterLink *link)
00208 {
00209     UnsharpContext *unsharp = link->dst->priv;
00210     AVFilterBufferRef *in  = link->cur_buf;
00211     AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
00212 
00213     unsharpen(out->data[0], in->data[0], out->linesize[0], in->linesize[0], link->w,            link->h,             &unsharp->luma);
00214     unsharpen(out->data[1], in->data[1], out->linesize[1], in->linesize[1], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma);
00215     unsharpen(out->data[2], in->data[2], out->linesize[2], in->linesize[2], CHROMA_WIDTH(link), CHROMA_HEIGHT(link), &unsharp->chroma);
00216 
00217     avfilter_unref_buffer(in);
00218     avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
00219     avfilter_end_frame(link->dst->outputs[0]);
00220     avfilter_unref_buffer(out);
00221 }
00222 
00223 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
00224 {
00225 }
00226 
00227 AVFilter avfilter_vf_unsharp = {
00228     .name      = "unsharp",
00229     .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
00230 
00231     .priv_size = sizeof(UnsharpContext),
00232 
00233     .init = init,
00234     .uninit = uninit,
00235     .query_formats = query_formats,
00236 
00237     .inputs    = (AVFilterPad[]) {{ .name             = "default",
00238                                     .type             = AVMEDIA_TYPE_VIDEO,
00239                                     .draw_slice       = draw_slice,
00240                                     .end_frame        = end_frame,
00241                                     .config_props     = config_props,
00242                                     .min_perms        = AV_PERM_READ, },
00243                                   { .name = NULL}},
00244 
00245     .outputs   = (AVFilterPad[]) {{ .name             = "default",
00246                                     .type             = AVMEDIA_TYPE_VIDEO, },
00247                                   { .name = NULL}},
00248 };

Generated on Fri Feb 22 2013 07:24:30 for FFmpeg by  doxygen 1.7.1