FFmpeg: libavfilter/vf_yadif.c Source File

00001 /*
00002  * Copyright (C) 2006-2010 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License along
00017  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
00018  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00019  */
00020 
00021 #include "libavutil/cpu.h"
00022 #include "libavutil/common.h"
00023 #include "avfilter.h"
00024 #include "yadif.h"
00025 
00026 #undef NDEBUG
00027 #include <assert.h>
00028 
00029 typedef struct {
00036     int mode;
00037 
00043     int parity;
00044 
00045     int frame_pending;
00046 
00047     AVFilterBufferRef *cur;
00048     AVFilterBufferRef *next;
00049     AVFilterBufferRef *prev;
00050     AVFilterBufferRef *out;
00051     void (*filter_line)(uint8_t *dst,
00052                         uint8_t *prev, uint8_t *cur, uint8_t *next,
00053                         int w, int prefs, int mrefs, int parity, int mode);
00054 } YADIFContext;
00055 
00056 static void filter_line_c(uint8_t *dst,
00057                           uint8_t *prev, uint8_t *cur, uint8_t *next,
00058                           int w, int prefs, int mrefs, int parity, int mode)
00059 {
00060     int x;
00061     uint8_t *prev2 = parity ? prev : cur ;
00062     uint8_t *next2 = parity ? cur  : next;
00063     for (x = 0;  x < w; x++) {
00064         int c = cur[mrefs];
00065         int d = (prev2[0] + next2[0])>>1;
00066         int e = cur[prefs];
00067         int temporal_diff0 = FFABS(prev2[0] - next2[0]);
00068         int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e) )>>1;
00069         int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e) )>>1;
00070         int diff = FFMAX3(temporal_diff0>>1, temporal_diff1, temporal_diff2);
00071         int spatial_pred = (c+e)>>1;
00072         int spatial_score = FFABS(cur[mrefs-1] - cur[prefs-1]) + FFABS(c-e)
00073                           + FFABS(cur[mrefs+1] - cur[prefs+1]) - 1;
00074 
00075 #define CHECK(j)\
00076     {   int score = FFABS(cur[mrefs-1+(j)] - cur[prefs-1-(j)])\
00077                   + FFABS(cur[mrefs  +(j)] - cur[prefs  -(j)])\
00078                   + FFABS(cur[mrefs+1+(j)] - cur[prefs+1-(j)]);\
00079         if (score < spatial_score) {\
00080             spatial_score= score;\
00081             spatial_pred= (cur[mrefs  +(j)] + cur[prefs  -(j)])>>1;\
00082 
00083         CHECK(-1) CHECK(-2) }} }}
00084         CHECK( 1) CHECK( 2) }} }}
00085 
00086         if (mode < 2) {
00087             int b = (prev2[2*mrefs] + next2[2*mrefs])>>1;
00088             int f = (prev2[2*prefs] + next2[2*prefs])>>1;
00089 #if 0
00090             int a = cur[-3*refs];
00091             int g = cur[+3*refs];
00092             int max = FFMAX3(d-e, d-c, FFMIN3(FFMAX(b-c,f-e),FFMAX(b-c,b-a),FFMAX(f-g,f-e)) );
00093             int min = FFMIN3(d-e, d-c, FFMAX3(FFMIN(b-c,f-e),FFMIN(b-c,b-a),FFMIN(f-g,f-e)) );
00094 #else
00095             int max = FFMAX3(d-e, d-c, FFMIN(b-c, f-e));
00096             int min = FFMIN3(d-e, d-c, FFMAX(b-c, f-e));
00097 #endif
00098 
00099             diff = FFMAX3(diff, min, -max);
00100         }
00101 
00102         if (spatial_pred > d + diff)
00103            spatial_pred = d + diff;
00104         else if (spatial_pred < d - diff)
00105            spatial_pred = d - diff;
00106 
00107         dst[0] = spatial_pred;
00108 
00109         dst++;
00110         cur++;
00111         prev++;
00112         next++;
00113         prev2++;
00114         next2++;
00115     }
00116 }
00117 
00118 static void filter(AVFilterContext *ctx, AVFilterBufferRef *dstpic,
00119                    int parity, int tff)
00120 {
00121     YADIFContext *yadif = ctx->priv;
00122     int y, i;
00123 
00124     for (i = 0; i < 3; i++) {
00125         int is_chroma = !!i;
00126         int w = dstpic->video->w >> is_chroma;
00127         int h = dstpic->video->h >> is_chroma;
00128         int refs = yadif->cur->linesize[i];
00129 
00130         for (y = 0; y < h; y++) {
00131             if ((y ^ parity) & 1) {
00132                 uint8_t *prev = &yadif->prev->data[i][y*refs];
00133                 uint8_t *cur  = &yadif->cur ->data[i][y*refs];
00134                 uint8_t *next = &yadif->next->data[i][y*refs];
00135                 uint8_t *dst  = &dstpic->data[i][y*dstpic->linesize[i]];
00136                 int     mode  = y==1 || y+2==h ? 2 : yadif->mode;
00137                 yadif->filter_line(dst, prev, cur, next, w, y+1<h ? refs : -refs, y ? -refs : refs, parity ^ tff, mode);
00138             } else {
00139                 memcpy(&dstpic->data[i][y*dstpic->linesize[i]],
00140                        &yadif->cur->data[i][y*refs], w);
00141             }
00142         }
00143     }
00144 #if HAVE_MMX
00145     __asm__ volatile("emms \n\t" : : : "memory");
00146 #endif
00147 }
00148 
00149 static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h)
00150 {
00151     AVFilterBufferRef *picref;
00152     int width = FFALIGN(w, 32);
00153     int height= FFALIGN(h+2, 32);
00154     int i;
00155 
00156     picref = avfilter_default_get_video_buffer(link, perms, width, height);
00157 
00158     picref->video->w = w;
00159     picref->video->h = h;
00160 
00161     for (i = 0; i < 3; i++)
00162         picref->data[i] += picref->linesize[i];
00163 
00164     return picref;
00165 }
00166 
00167 static void return_frame(AVFilterContext *ctx, int is_second)
00168 {
00169     YADIFContext *yadif = ctx->priv;
00170     AVFilterLink *link= ctx->outputs[0];
00171     int tff;
00172 
00173     if (yadif->parity == -1) {
00174         tff = yadif->cur->video->interlaced ?
00175             yadif->cur->video->top_field_first : 1;
00176     } else {
00177         tff = yadif->parity^1;
00178     }
00179 
00180     if (is_second)
00181         yadif->out = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
00182                                                AV_PERM_REUSE, link->w, link->h);
00183 
00184     filter(ctx, yadif->out, tff ^ !is_second, tff);
00185 
00186     if (is_second) {
00187         if (yadif->next->pts != AV_NOPTS_VALUE &&
00188             yadif->cur->pts != AV_NOPTS_VALUE) {
00189             yadif->out->pts =
00190                 (yadif->next->pts&yadif->cur->pts) +
00191                 ((yadif->next->pts^yadif->cur->pts)>>1);
00192         } else {
00193             yadif->out->pts = AV_NOPTS_VALUE;
00194         }
00195         avfilter_start_frame(ctx->outputs[0], yadif->out);
00196     }
00197     avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
00198     avfilter_end_frame(ctx->outputs[0]);
00199 
00200     yadif->frame_pending = (yadif->mode&1) && !is_second;
00201 }
00202 
00203 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
00204 {
00205     AVFilterContext *ctx = link->dst;
00206     YADIFContext *yadif = ctx->priv;
00207 
00208     if (yadif->frame_pending)
00209         return_frame(ctx, 1);
00210 
00211     if (yadif->prev)
00212         avfilter_unref_buffer(yadif->prev);
00213     yadif->prev = yadif->cur;
00214     yadif->cur  = yadif->next;
00215     yadif->next = picref;
00216 
00217     if (!yadif->cur)
00218         return;
00219 
00220     if (!yadif->prev)
00221         yadif->prev = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
00222 
00223     yadif->out = avfilter_get_video_buffer(ctx->outputs[0], AV_PERM_WRITE | AV_PERM_PRESERVE |
00224                                        AV_PERM_REUSE, link->w, link->h);
00225 
00226     avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
00227     yadif->out->video->interlaced = 0;
00228     avfilter_start_frame(ctx->outputs[0], yadif->out);
00229 }
00230 
00231 static void end_frame(AVFilterLink *link)
00232 {
00233     AVFilterContext *ctx = link->dst;
00234     YADIFContext *yadif = ctx->priv;
00235 
00236     if (!yadif->out)
00237         return;
00238 
00239     return_frame(ctx, 0);
00240 }
00241 
00242 static int request_frame(AVFilterLink *link)
00243 {
00244     AVFilterContext *ctx = link->src;
00245     YADIFContext *yadif = ctx->priv;
00246 
00247     if (yadif->frame_pending) {
00248         return_frame(ctx, 1);
00249         return 0;
00250     }
00251 
00252     do {
00253         int ret;
00254 
00255         if ((ret = avfilter_request_frame(link->src->inputs[0])))
00256             return ret;
00257     } while (!yadif->cur);
00258 
00259     return 0;
00260 }
00261 
00262 static int poll_frame(AVFilterLink *link)
00263 {
00264     YADIFContext *yadif = link->src->priv;
00265     int ret, val;
00266 
00267     if (yadif->frame_pending)
00268         return 1;
00269 
00270     val = avfilter_poll_frame(link->src->inputs[0]);
00271 
00272     if (val==1 && !yadif->next) { //FIXME change API to not requre this red tape
00273         if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
00274             return ret;
00275         val = avfilter_poll_frame(link->src->inputs[0]);
00276     }
00277     assert(yadif->next);
00278 
00279     return val * ((yadif->mode&1)+1);
00280 }
00281 
00282 static av_cold void uninit(AVFilterContext *ctx)
00283 {
00284     YADIFContext *yadif = ctx->priv;
00285 
00286     if (yadif->prev) avfilter_unref_buffer(yadif->prev);
00287     if (yadif->cur ) avfilter_unref_buffer(yadif->cur );
00288     if (yadif->next) avfilter_unref_buffer(yadif->next);
00289 }
00290 
00291 static int query_formats(AVFilterContext *ctx)
00292 {
00293     static const enum PixelFormat pix_fmts[] = {
00294         PIX_FMT_YUV420P,
00295         PIX_FMT_GRAY8,
00296         PIX_FMT_NONE
00297     };
00298 
00299     avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
00300 
00301     return 0;
00302 }
00303 
00304 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00305 {
00306     YADIFContext *yadif = ctx->priv;
00307     av_unused int cpu_flags = av_get_cpu_flags();
00308 
00309     yadif->mode = 0;
00310     yadif->parity = -1;
00311 
00312     if (args) sscanf(args, "%d:%d", &yadif->mode, &yadif->parity);
00313 
00314     yadif->filter_line = filter_line_c;
00315     if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3)
00316         yadif->filter_line = ff_yadif_filter_line_ssse3;
00317     else if (HAVE_SSE && cpu_flags & AV_CPU_FLAG_SSE2)
00318         yadif->filter_line = ff_yadif_filter_line_sse2;
00319     else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX)
00320         yadif->filter_line = ff_yadif_filter_line_mmx;
00321 
00322     av_log(ctx, AV_LOG_INFO, "mode:%d parity:%d\n", yadif->mode, yadif->parity);
00323 
00324     return 0;
00325 }
00326 
00327 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
00328 
00329 AVFilter avfilter_vf_yadif = {
00330     .name          = "yadif",
00331     .description   = NULL_IF_CONFIG_SMALL("Deinterlace the input image"),
00332 
00333     .priv_size     = sizeof(YADIFContext),
00334     .init          = init,
00335     .uninit        = uninit,
00336     .query_formats = query_formats,
00337 
00338     .inputs    = (AVFilterPad[]) {{ .name             = "default",
00339                                     .type             = AVMEDIA_TYPE_VIDEO,
00340                                     .start_frame      = start_frame,
00341                                     .get_video_buffer = get_video_buffer,
00342                                     .draw_slice       = null_draw_slice,
00343                                     .end_frame        = end_frame, },
00344                                   { .name = NULL}},
00345 
00346     .outputs   = (AVFilterPad[]) {{ .name             = "default",
00347                                     .type             = AVMEDIA_TYPE_VIDEO,
00348                                     .poll_frame       = poll_frame,
00349                                     .request_frame    = request_frame, },
00350                                   { .name = NULL}},
00351 };