Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2010 Nolan Lum <nol888@gmail.com> 00003 * Copyright (c) 2009 Loren Merritt <lorenm@u.washignton.edu> 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00035 #include "libavutil/imgutils.h" 00036 #include "libavutil/cpu.h" 00037 #include "libavutil/pixdesc.h" 00038 #include "avfilter.h" 00039 #include "gradfun.h" 00040 00041 DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = { 00042 {0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E}, 00043 {0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E}, 00044 {0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E}, 00045 {0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E}, 00046 {0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A}, 00047 {0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A}, 00048 {0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A}, 00049 {0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A}, 00050 }; 00051 00052 void ff_gradfun_filter_line_c(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers) 00053 { 00054 int x; 00055 for (x = 0; x < width; x++, dc += x & 1) { 00056 int pix = src[x] << 7; 00057 int delta = dc[0] - pix; 00058 int m = abs(delta) * thresh >> 16; 00059 m = FFMAX(0, 127 - m); 00060 m = m * m * delta >> 14; 00061 pix += m + dithers[x & 7]; 00062 dst[x] = av_clip_uint8(pix >> 7); 00063 } 00064 } 00065 00066 void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width) 00067 { 00068 int x, v, old; 00069 for (x = 0; x < width; x++) { 00070 v = buf1[x] + src[2 * x] + src[2 * x + 1] + src[2 * x + src_linesize] + src[2 * x + 1 + src_linesize]; 00071 old = buf[x]; 00072 buf[x] = v; 00073 dc[x] = v - old; 00074 } 00075 } 00076 00077 static void filter(GradFunContext *ctx, uint8_t *dst, uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r) 00078 { 00079 int bstride = FFALIGN(width, 16) / 2; 00080 int y; 00081 uint32_t dc_factor = (1 << 21) / (r * r); 00082 uint16_t *dc = ctx->buf + 16; 00083 uint16_t *buf = ctx->buf + bstride + 32; 00084 int thresh = ctx->thresh; 00085 00086 memset(dc, 0, (bstride + 16) * sizeof(*buf)); 00087 for (y = 0; y < r; y++) 00088 ctx->blur_line(dc, buf + y * bstride, buf + (y - 1) * bstride, src + 2 * y * src_linesize, src_linesize, width / 2); 00089 for (;;) { 00090 if (y < height - r) { 00091 int mod = ((y + r) / 2) % r; 00092 uint16_t *buf0 = buf + mod * bstride; 00093 uint16_t *buf1 = buf + (mod ? mod - 1 : r - 1) * bstride; 00094 int x, v; 00095 ctx->blur_line(dc, buf0, buf1, src + (y + r) * src_linesize, src_linesize, width / 2); 00096 for (x = v = 0; x < r; x++) 00097 v += dc[x]; 00098 for (; x < width / 2; x++) { 00099 v += dc[x] - dc[x-r]; 00100 dc[x-r] = v * dc_factor >> 16; 00101 } 00102 for (; x < (width + r + 1) / 2; x++) 00103 dc[x-r] = v * dc_factor >> 16; 00104 for (x = -r / 2; x < 0; x++) 00105 dc[x] = dc[0]; 00106 } 00107 if (y == r) { 00108 for (y = 0; y < r; y++) 00109 ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); 00110 } 00111 ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); 00112 if (++y >= height) break; 00113 ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); 00114 if (++y >= height) break; 00115 } 00116 } 00117 00118 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) 00119 { 00120 GradFunContext *gf = ctx->priv; 00121 float thresh = 1.2; 00122 int radius = 16; 00123 av_unused int cpu_flags = av_get_cpu_flags(); 00124 00125 if (args) 00126 sscanf(args, "%f:%d", &thresh, &radius); 00127 00128 thresh = av_clipf(thresh, 0.51, 255); 00129 gf->thresh = (1 << 15) / thresh; 00130 gf->radius = av_clip((radius + 1) & ~1, 4, 32); 00131 00132 gf->blur_line = ff_gradfun_blur_line_c; 00133 gf->filter_line = ff_gradfun_filter_line_c; 00134 00135 if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX2) 00136 gf->filter_line = ff_gradfun_filter_line_mmx2; 00137 if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3) 00138 gf->filter_line = ff_gradfun_filter_line_ssse3; 00139 if (HAVE_SSE && cpu_flags & AV_CPU_FLAG_SSE2) 00140 gf->blur_line = ff_gradfun_blur_line_sse2; 00141 00142 av_log(ctx, AV_LOG_INFO, "threshold:%.2f radius:%d\n", thresh, gf->radius); 00143 00144 return 0; 00145 } 00146 00147 static av_cold void uninit(AVFilterContext *ctx) 00148 { 00149 GradFunContext *gf = ctx->priv; 00150 av_freep(&gf->buf); 00151 } 00152 00153 static int query_formats(AVFilterContext *ctx) 00154 { 00155 static const enum PixelFormat pix_fmts[] = { 00156 PIX_FMT_YUV410P, PIX_FMT_YUV420P, 00157 PIX_FMT_GRAY8, PIX_FMT_NV12, 00158 PIX_FMT_NV21, PIX_FMT_YUV444P, 00159 PIX_FMT_YUV422P, PIX_FMT_YUV411P, 00160 PIX_FMT_NONE 00161 }; 00162 00163 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); 00164 00165 return 0; 00166 } 00167 00168 static int config_input(AVFilterLink *inlink) 00169 { 00170 GradFunContext *gf = inlink->dst->priv; 00171 int hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w; 00172 int vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h; 00173 00174 gf->buf = av_mallocz((FFALIGN(inlink->w, 16) * (gf->radius + 1) / 2 + 32) * sizeof(uint16_t)); 00175 if (!gf->buf) 00176 return AVERROR(ENOMEM); 00177 00178 gf->chroma_w = -((-inlink->w) >> hsub); 00179 gf->chroma_h = -((-inlink->h) >> vsub); 00180 gf->chroma_r = av_clip(((((gf->radius >> hsub) + (gf->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32); 00181 00182 return 0; 00183 } 00184 00185 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref) 00186 { 00187 AVFilterLink *outlink = inlink->dst->outputs[0]; 00188 AVFilterBufferRef *outpicref; 00189 00190 if (inpicref->perms & AV_PERM_PRESERVE) { 00191 outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); 00192 avfilter_copy_buffer_ref_props(outpicref, inpicref); 00193 outpicref->video->w = outlink->w; 00194 outpicref->video->h = outlink->h; 00195 } else 00196 outpicref = inpicref; 00197 00198 outlink->out_buf = outpicref; 00199 avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0)); 00200 } 00201 00202 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { } 00203 00204 static void end_frame(AVFilterLink *inlink) 00205 { 00206 GradFunContext *gf = inlink->dst->priv; 00207 AVFilterBufferRef *inpic = inlink->cur_buf; 00208 AVFilterLink *outlink = inlink->dst->outputs[0]; 00209 AVFilterBufferRef *outpic = outlink->out_buf; 00210 int p; 00211 00212 for (p = 0; p < 4 && inpic->data[p]; p++) { 00213 int w = inlink->w; 00214 int h = inlink->h; 00215 int r = gf->radius; 00216 if (p) { 00217 w = gf->chroma_w; 00218 h = gf->chroma_h; 00219 r = gf->chroma_r; 00220 } 00221 00222 if (FFMIN(w, h) > 2 * r) 00223 filter(gf, outpic->data[p], inpic->data[p], w, h, outpic->linesize[p], inpic->linesize[p], r); 00224 else if (outpic->data[p] != inpic->data[p]) 00225 av_image_copy_plane(outpic->data[p], outpic->linesize[p], inpic->data[p], inpic->linesize[p], w, h); 00226 } 00227 00228 avfilter_draw_slice(outlink, 0, inlink->h, 1); 00229 avfilter_end_frame(outlink); 00230 avfilter_unref_buffer(inpic); 00231 if (outpic != inpic) 00232 avfilter_unref_buffer(outpic); 00233 } 00234 00235 AVFilter avfilter_vf_gradfun = { 00236 .name = "gradfun", 00237 .description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."), 00238 .priv_size = sizeof(GradFunContext), 00239 .init = init, 00240 .uninit = uninit, 00241 .query_formats = query_formats, 00242 00243 .inputs = (AVFilterPad[]) {{ .name = "default", 00244 .type = AVMEDIA_TYPE_VIDEO, 00245 .config_props = config_input, 00246 .start_frame = start_frame, 00247 .draw_slice = null_draw_slice, 00248 .end_frame = end_frame, 00249 .min_perms = AV_PERM_READ, }, 00250 { .name = NULL}}, 00251 .outputs = (AVFilterPad[]) {{ .name = "default", 00252 .type = AVMEDIA_TYPE_VIDEO, }, 00253 { .name = NULL}}, 00254 };