FFmpeg: libavfilter/vf_yadif.c Source File

00001 /*
00002  * Copyright (C) 2006-2011 Michael Niedermayer <michaelni@gmx.at>
00003  *               2010      James Darnley <james.darnley@gmail.com>
00004  *
00005  * FFmpeg is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License as published by
00007  * the Free Software Foundation; either version 2 of the License, or
00008  * (at your option) any later version.
00009  *
00010  * FFmpeg is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License along
00016  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
00017  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00018  */
00019 
00020 #include "libavutil/cpu.h"
00021 #include "libavutil/common.h"
00022 #include "libavutil/pixdesc.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 
00051     int auto_enable;
00052 
00053     AVFilterBufferRef *cur;
00054     AVFilterBufferRef *next;
00055     AVFilterBufferRef *prev;
00056     AVFilterBufferRef *out;
00057     void (*filter_line)(uint8_t *dst,
00058                         uint8_t *prev, uint8_t *cur, uint8_t *next,
00059                         int w, int prefs, int mrefs, int parity, int mode);
00060 
00061     const AVPixFmtDescriptor *csp;
00062 } YADIFContext;
00063 
00064 #define CHECK(j)\
00065     {   int score = FFABS(cur[mrefs-1+(j)] - cur[prefs-1-(j)])\
00066                   + FFABS(cur[mrefs  +(j)] - cur[prefs  -(j)])\
00067                   + FFABS(cur[mrefs+1+(j)] - cur[prefs+1-(j)]);\
00068         if (score < spatial_score) {\
00069             spatial_score= score;\
00070             spatial_pred= (cur[mrefs  +(j)] + cur[prefs  -(j)])>>1;\
00071 
00072 #define FILTER \
00073     for (x = 0;  x < w; x++) { \
00074         int c = cur[mrefs]; \
00075         int d = (prev2[0] + next2[0])>>1; \
00076         int e = cur[prefs]; \
00077         int temporal_diff0 = FFABS(prev2[0] - next2[0]); \
00078         int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e) )>>1; \
00079         int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e) )>>1; \
00080         int diff = FFMAX3(temporal_diff0>>1, temporal_diff1, temporal_diff2); \
00081         int spatial_pred = (c+e)>>1; \
00082         int spatial_score = FFABS(cur[mrefs-1] - cur[prefs-1]) + FFABS(c-e) \
00083                           + FFABS(cur[mrefs+1] - cur[prefs+1]) - 1; \
00084  \
00085         CHECK(-1) CHECK(-2) }} }} \
00086         CHECK( 1) CHECK( 2) }} }} \
00087  \
00088         if (mode < 2) { \
00089             int b = (prev2[2*mrefs] + next2[2*mrefs])>>1; \
00090             int f = (prev2[2*prefs] + next2[2*prefs])>>1; \
00091             int max = FFMAX3(d-e, d-c, FFMIN(b-c, f-e)); \
00092             int min = FFMIN3(d-e, d-c, FFMAX(b-c, f-e)); \
00093  \
00094             diff = FFMAX3(diff, min, -max); \
00095         } \
00096  \
00097         if (spatial_pred > d + diff) \
00098            spatial_pred = d + diff; \
00099         else if (spatial_pred < d - diff) \
00100            spatial_pred = d - diff; \
00101  \
00102         dst[0] = spatial_pred; \
00103  \
00104         dst++; \
00105         cur++; \
00106         prev++; \
00107         next++; \
00108         prev2++; \
00109         next2++; \
00110     }
00111 
00112 static void filter_line_c(uint8_t *dst,
00113                           uint8_t *prev, uint8_t *cur, uint8_t *next,
00114                           int w, int prefs, int mrefs, int parity, int mode)
00115 {
00116     int x;
00117     uint8_t *prev2 = parity ? prev : cur ;
00118     uint8_t *next2 = parity ? cur  : next;
00119 
00120     FILTER
00121 }
00122 
00123 static void filter_line_c_16bit(uint16_t *dst,
00124                                 uint16_t *prev, uint16_t *cur, uint16_t *next,
00125                                 int w, int prefs, int mrefs, int parity, int mode)
00126 {
00127     int x;
00128     uint16_t *prev2 = parity ? prev : cur ;
00129     uint16_t *next2 = parity ? cur  : next;
00130     mrefs /= 2;
00131     prefs /= 2;
00132 
00133     FILTER
00134 }
00135 
00136 static void filter(AVFilterContext *ctx, AVFilterBufferRef *dstpic,
00137                    int parity, int tff)
00138 {
00139     YADIFContext *yadif = ctx->priv;
00140     int y, i;
00141 
00142     for (i = 0; i < yadif->csp->nb_components; i++) {
00143         int w = dstpic->video->w;
00144         int h = dstpic->video->h;
00145         int refs = yadif->cur->linesize[i];
00146         int df = (yadif->csp->comp[i].depth_minus1+1) / 8;
00147 
00148         if (i == 1 || i == 2) {
00149         /* Why is this not part of the per-plane description thing? */
00150             w >>= yadif->csp->log2_chroma_w;
00151             h >>= yadif->csp->log2_chroma_h;
00152         }
00153 
00154         for (y = 0; y < h; y++) {
00155             if ((y ^ parity) & 1) {
00156                 uint8_t *prev = &yadif->prev->data[i][y*refs];
00157                 uint8_t *cur  = &yadif->cur ->data[i][y*refs];
00158                 uint8_t *next = &yadif->next->data[i][y*refs];
00159                 uint8_t *dst  = &dstpic->data[i][y*dstpic->linesize[i]];
00160                 int     mode  = y==1 || y+2==h ? 2 : yadif->mode;
00161                 yadif->filter_line(dst, prev, cur, next, w, y+1<h ? refs : -refs, y ? -refs : refs, parity ^ tff, mode);
00162             } else {
00163                 memcpy(&dstpic->data[i][y*dstpic->linesize[i]],
00164                        &yadif->cur->data[i][y*refs], w*df);
00165             }
00166         }
00167     }
00168 #if HAVE_MMX
00169     __asm__ volatile("emms \n\t" : : : "memory");
00170 #endif
00171 }
00172 
00173 static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h)
00174 {
00175     AVFilterBufferRef *picref;
00176     int width = FFALIGN(w, 32);
00177     int height= FFALIGN(h+2, 32);
00178     int i;
00179 
00180     picref = avfilter_default_get_video_buffer(link, perms, width, height);
00181 
00182     picref->video->w = w;
00183     picref->video->h = h;
00184 
00185     for (i = 0; i < 3; i++)
00186         picref->data[i] += picref->linesize[i];
00187 
00188     return picref;
00189 }
00190 
00191 static void return_frame(AVFilterContext *ctx, int is_second)
00192 {
00193     YADIFContext *yadif = ctx->priv;
00194     AVFilterLink *link= ctx->outputs[0];
00195     int tff;
00196 
00197     if (yadif->parity == -1) {
00198         tff = yadif->cur->video->interlaced ?
00199             yadif->cur->video->top_field_first : 1;
00200     } else {
00201         tff = yadif->parity^1;
00202     }
00203 
00204     if (is_second) {
00205         yadif->out = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
00206                                                AV_PERM_REUSE, link->w, link->h);
00207         avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
00208         yadif->out->video->interlaced = 0;
00209     }
00210 
00211     if (!yadif->csp)
00212         yadif->csp = &av_pix_fmt_descriptors[link->format];
00213     if (yadif->csp->comp[0].depth_minus1 == 15)
00214         yadif->filter_line = (void*)filter_line_c_16bit;
00215 
00216     filter(ctx, yadif->out, tff ^ !is_second, tff);
00217 
00218     if (is_second) {
00219         if (yadif->next->pts != AV_NOPTS_VALUE &&
00220             yadif->cur->pts != AV_NOPTS_VALUE) {
00221             yadif->out->pts =
00222                 (yadif->next->pts&yadif->cur->pts) +
00223                 ((yadif->next->pts^yadif->cur->pts)>>1);
00224         } else {
00225             yadif->out->pts = AV_NOPTS_VALUE;
00226         }
00227         avfilter_start_frame(ctx->outputs[0], yadif->out);
00228     }
00229     avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
00230     avfilter_end_frame(ctx->outputs[0]);
00231 
00232     yadif->frame_pending = (yadif->mode&1) && !is_second;
00233 }
00234 
00235 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
00236 {
00237     AVFilterContext *ctx = link->dst;
00238     YADIFContext *yadif = ctx->priv;
00239 
00240     if (yadif->frame_pending)
00241         return_frame(ctx, 1);
00242 
00243     if (yadif->prev)
00244         avfilter_unref_buffer(yadif->prev);
00245     yadif->prev = yadif->cur;
00246     yadif->cur  = yadif->next;
00247     yadif->next = picref;
00248 
00249     if (!yadif->cur)
00250         return;
00251 
00252     if (yadif->auto_enable && !yadif->cur->video->interlaced) {
00253         yadif->out  = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
00254         avfilter_unref_buffer(yadif->prev);
00255         yadif->prev = NULL;
00256         avfilter_start_frame(ctx->outputs[0], yadif->out);
00257         return;
00258     }
00259 
00260     if (!yadif->prev)
00261         yadif->prev = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
00262 
00263     yadif->out = avfilter_get_video_buffer(ctx->outputs[0], AV_PERM_WRITE | AV_PERM_PRESERVE |
00264                                        AV_PERM_REUSE, link->w, link->h);
00265 
00266     avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
00267     yadif->out->video->interlaced = 0;
00268     avfilter_start_frame(ctx->outputs[0], yadif->out);
00269 }
00270 
00271 static void end_frame(AVFilterLink *link)
00272 {
00273     AVFilterContext *ctx = link->dst;
00274     YADIFContext *yadif = ctx->priv;
00275 
00276     if (!yadif->out)
00277         return;
00278 
00279     if (yadif->auto_enable && !yadif->cur->video->interlaced) {
00280         avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
00281         avfilter_end_frame(ctx->outputs[0]);
00282         return;
00283     }
00284 
00285     return_frame(ctx, 0);
00286 }
00287 
00288 static int request_frame(AVFilterLink *link)
00289 {
00290     AVFilterContext *ctx = link->src;
00291     YADIFContext *yadif = ctx->priv;
00292 
00293     if (yadif->frame_pending) {
00294         return_frame(ctx, 1);
00295         return 0;
00296     }
00297 
00298     do {
00299         int ret;
00300 
00301         if ((ret = avfilter_request_frame(link->src->inputs[0])))
00302             return ret;
00303     } while (!yadif->cur);
00304 
00305     return 0;
00306 }
00307 
00308 static int poll_frame(AVFilterLink *link)
00309 {
00310     YADIFContext *yadif = link->src->priv;
00311     int ret, val;
00312 
00313     if (yadif->frame_pending)
00314         return 1;
00315 
00316     val = avfilter_poll_frame(link->src->inputs[0]);
00317 
00318     if (val==1 && !yadif->next) { //FIXME change API to not requre this red tape
00319         if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
00320             return ret;
00321         val = avfilter_poll_frame(link->src->inputs[0]);
00322     }
00323     assert(yadif->next || !val);
00324 
00325     if (yadif->auto_enable && yadif->next && !yadif->next->video->interlaced)
00326         return val;
00327 
00328     return val * ((yadif->mode&1)+1);
00329 }
00330 
00331 static av_cold void uninit(AVFilterContext *ctx)
00332 {
00333     YADIFContext *yadif = ctx->priv;
00334 
00335     if (yadif->prev) avfilter_unref_buffer(yadif->prev);
00336     if (yadif->cur ) avfilter_unref_buffer(yadif->cur );
00337     if (yadif->next) avfilter_unref_buffer(yadif->next);
00338 }
00339 
00340 static int query_formats(AVFilterContext *ctx)
00341 {
00342     static const enum PixelFormat pix_fmts[] = {
00343         PIX_FMT_YUV420P,
00344         PIX_FMT_YUV422P,
00345         PIX_FMT_YUV444P,
00346         PIX_FMT_YUV410P,
00347         PIX_FMT_YUV411P,
00348         PIX_FMT_GRAY8,
00349         PIX_FMT_YUVJ420P,
00350         PIX_FMT_YUVJ422P,
00351         PIX_FMT_YUVJ444P,
00352         AV_NE( PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE ),
00353         PIX_FMT_YUV440P,
00354         PIX_FMT_YUVJ440P,
00355         AV_NE( PIX_FMT_YUV420P16BE, PIX_FMT_YUV420P16LE ),
00356         AV_NE( PIX_FMT_YUV422P16BE, PIX_FMT_YUV422P16LE ),
00357         AV_NE( PIX_FMT_YUV444P16BE, PIX_FMT_YUV444P16LE ),
00358         PIX_FMT_YUVA420P,
00359         PIX_FMT_NONE
00360     };
00361 
00362     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00363 
00364     return 0;
00365 }
00366 
00367 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00368 {
00369     YADIFContext *yadif = ctx->priv;
00370     av_unused int cpu_flags = av_get_cpu_flags();
00371 
00372     yadif->mode = 0;
00373     yadif->parity = -1;
00374     yadif->auto_enable = 0;
00375     yadif->csp = NULL;
00376 
00377     if (args) sscanf(args, "%d:%d:%d", &yadif->mode, &yadif->parity, &yadif->auto_enable);
00378 
00379     yadif->filter_line = filter_line_c;
00380     if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3)
00381         yadif->filter_line = ff_yadif_filter_line_ssse3;
00382     else if (HAVE_SSE && cpu_flags & AV_CPU_FLAG_SSE2)
00383         yadif->filter_line = ff_yadif_filter_line_sse2;
00384     else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX)
00385         yadif->filter_line = ff_yadif_filter_line_mmx;
00386 
00387     av_log(ctx, AV_LOG_INFO, "mode:%d parity:%d auto_enable:%d\n", yadif->mode, yadif->parity, yadif->auto_enable);
00388 
00389     return 0;
00390 }
00391 
00392 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
00393 
00394 AVFilter avfilter_vf_yadif = {
00395     .name          = "yadif",
00396     .description   = NULL_IF_CONFIG_SMALL("Deinterlace the input image"),
00397 
00398     .priv_size     = sizeof(YADIFContext),
00399     .init          = init,
00400     .uninit        = uninit,
00401     .query_formats = query_formats,
00402 
00403     .inputs    = (const AVFilterPad[]) {{ .name       = "default",
00404                                     .type             = AVMEDIA_TYPE_VIDEO,
00405                                     .start_frame      = start_frame,
00406                                     .get_video_buffer = get_video_buffer,
00407                                     .draw_slice       = null_draw_slice,
00408                                     .end_frame        = end_frame,
00409                                     .rej_perms        = AV_PERM_REUSE2, },
00410                                   { .name = NULL}},
00411 
00412     .outputs   = (const AVFilterPad[]) {{ .name       = "default",
00413                                     .type             = AVMEDIA_TYPE_VIDEO,
00414                                     .poll_frame       = poll_frame,
00415                                     .request_frame    = request_frame, },
00416                                   { .name = NULL}},
00417 };