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/avassert.h"
00021 #include "libavutil/cpu.h"
00022 #include "libavutil/common.h"
00023 #include "libavutil/pixdesc.h"
00024 #include "avfilter.h"
00025 #include "video.h"
00026 #include "yadif.h"
00027 
00028 #undef NDEBUG
00029 #include <assert.h>
00030 
00031 typedef struct {
00038     int mode;
00039 
00045     int parity;
00046 
00047     int frame_pending;
00048 
00053     int auto_enable;
00054 
00055     AVFilterBufferRef *cur;
00056     AVFilterBufferRef *next;
00057     AVFilterBufferRef *prev;
00058     AVFilterBufferRef *out;
00059     void (*filter_line)(uint8_t *dst,
00060                         uint8_t *prev, uint8_t *cur, uint8_t *next,
00061                         int w, int prefs, int mrefs, int parity, int mode);
00062 
00063     const AVPixFmtDescriptor *csp;
00064     int eof;
00065 } YADIFContext;
00066 
00067 #define CHECK(j)\
00068     {   int score = FFABS(cur[mrefs-1+(j)] - cur[prefs-1-(j)])\
00069                   + FFABS(cur[mrefs  +(j)] - cur[prefs  -(j)])\
00070                   + FFABS(cur[mrefs+1+(j)] - cur[prefs+1-(j)]);\
00071         if (score < spatial_score) {\
00072             spatial_score= score;\
00073             spatial_pred= (cur[mrefs  +(j)] + cur[prefs  -(j)])>>1;\
00074 
00075 #define FILTER \
00076     for (x = 0;  x < w; x++) { \
00077         int c = cur[mrefs]; \
00078         int d = (prev2[0] + next2[0])>>1; \
00079         int e = cur[prefs]; \
00080         int temporal_diff0 = FFABS(prev2[0] - next2[0]); \
00081         int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e) )>>1; \
00082         int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e) )>>1; \
00083         int diff = FFMAX3(temporal_diff0>>1, temporal_diff1, temporal_diff2); \
00084         int spatial_pred = (c+e)>>1; \
00085         int spatial_score = FFABS(cur[mrefs-1] - cur[prefs-1]) + FFABS(c-e) \
00086                           + FFABS(cur[mrefs+1] - cur[prefs+1]) - 1; \
00087  \
00088         CHECK(-1) CHECK(-2) }} }} \
00089         CHECK( 1) CHECK( 2) }} }} \
00090  \
00091         if (mode < 2) { \
00092             int b = (prev2[2*mrefs] + next2[2*mrefs])>>1; \
00093             int f = (prev2[2*prefs] + next2[2*prefs])>>1; \
00094             int max = FFMAX3(d-e, d-c, FFMIN(b-c, f-e)); \
00095             int min = FFMIN3(d-e, d-c, FFMAX(b-c, f-e)); \
00096  \
00097             diff = FFMAX3(diff, min, -max); \
00098         } \
00099  \
00100         if (spatial_pred > d + diff) \
00101            spatial_pred = d + diff; \
00102         else if (spatial_pred < d - diff) \
00103            spatial_pred = d - diff; \
00104  \
00105         dst[0] = spatial_pred; \
00106  \
00107         dst++; \
00108         cur++; \
00109         prev++; \
00110         next++; \
00111         prev2++; \
00112         next2++; \
00113     }
00114 
00115 static void filter_line_c(uint8_t *dst,
00116                           uint8_t *prev, uint8_t *cur, uint8_t *next,
00117                           int w, int prefs, int mrefs, int parity, int mode)
00118 {
00119     int x;
00120     uint8_t *prev2 = parity ? prev : cur ;
00121     uint8_t *next2 = parity ? cur  : next;
00122 
00123     FILTER
00124 }
00125 
00126 static void filter_line_c_16bit(uint16_t *dst,
00127                                 uint16_t *prev, uint16_t *cur, uint16_t *next,
00128                                 int w, int prefs, int mrefs, int parity, int mode)
00129 {
00130     int x;
00131     uint16_t *prev2 = parity ? prev : cur ;
00132     uint16_t *next2 = parity ? cur  : next;
00133     mrefs /= 2;
00134     prefs /= 2;
00135 
00136     FILTER
00137 }
00138 
00139 static void filter(AVFilterContext *ctx, AVFilterBufferRef *dstpic,
00140                    int parity, int tff)
00141 {
00142     YADIFContext *yadif = ctx->priv;
00143     int y, i;
00144 
00145     for (i = 0; i < yadif->csp->nb_components; i++) {
00146         int w = dstpic->video->w;
00147         int h = dstpic->video->h;
00148         int refs = yadif->cur->linesize[i];
00149         int df = (yadif->csp->comp[i].depth_minus1 + 8) / 8;
00150 
00151         if (i == 1 || i == 2) {
00152         /* Why is this not part of the per-plane description thing? */
00153             w >>= yadif->csp->log2_chroma_w;
00154             h >>= yadif->csp->log2_chroma_h;
00155         }
00156 
00157         for (y = 0; y < h; y++) {
00158             if ((y ^ parity) & 1) {
00159                 uint8_t *prev = &yadif->prev->data[i][y*refs];
00160                 uint8_t *cur  = &yadif->cur ->data[i][y*refs];
00161                 uint8_t *next = &yadif->next->data[i][y*refs];
00162                 uint8_t *dst  = &dstpic->data[i][y*dstpic->linesize[i]];
00163                 int     mode  = y==1 || y+2==h ? 2 : yadif->mode;
00164                 yadif->filter_line(dst, prev, cur, next, w, y+1<h ? refs : -refs, y ? -refs : refs, parity ^ tff, mode);
00165             } else {
00166                 memcpy(&dstpic->data[i][y*dstpic->linesize[i]],
00167                        &yadif->cur->data[i][y*refs], w*df);
00168             }
00169         }
00170     }
00171 #if HAVE_MMX
00172     __asm__ volatile("emms \n\t" : : : "memory");
00173 #endif
00174 }
00175 
00176 static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h)
00177 {
00178     AVFilterBufferRef *picref;
00179     int width = FFALIGN(w, 32);
00180     int height= FFALIGN(h+2, 32);
00181     int i;
00182 
00183     picref = ff_default_get_video_buffer(link, perms, width, height);
00184 
00185     picref->video->w = w;
00186     picref->video->h = h;
00187 
00188     for (i = 0; i < 3; i++)
00189         picref->data[i] += picref->linesize[i];
00190 
00191     return picref;
00192 }
00193 
00194 static void return_frame(AVFilterContext *ctx, int is_second)
00195 {
00196     YADIFContext *yadif = ctx->priv;
00197     AVFilterLink *link= ctx->outputs[0];
00198     int tff;
00199 
00200     if (yadif->parity == -1) {
00201         tff = yadif->cur->video->interlaced ?
00202             yadif->cur->video->top_field_first : 1;
00203     } else {
00204         tff = yadif->parity^1;
00205     }
00206 
00207     if (is_second) {
00208         yadif->out = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
00209                                                AV_PERM_REUSE, link->w, link->h);
00210         avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
00211         yadif->out->video->interlaced = 0;
00212     }
00213 
00214     if (!yadif->csp)
00215         yadif->csp = &av_pix_fmt_descriptors[link->format];
00216     if (yadif->csp->comp[0].depth_minus1 / 8 == 1)
00217         yadif->filter_line = (void*)filter_line_c_16bit;
00218 
00219     filter(ctx, yadif->out, tff ^ !is_second, tff);
00220 
00221     if (is_second) {
00222         int64_t cur_pts  = yadif->cur->pts;
00223         int64_t next_pts = yadif->next->pts;
00224 
00225         if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) {
00226             yadif->out->pts = cur_pts + next_pts;
00227         } else {
00228             yadif->out->pts = AV_NOPTS_VALUE;
00229         }
00230         avfilter_start_frame(ctx->outputs[0], yadif->out);
00231     }
00232     avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
00233     avfilter_end_frame(ctx->outputs[0]);
00234 
00235     yadif->frame_pending = (yadif->mode&1) && !is_second;
00236 }
00237 
00238 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
00239 {
00240     AVFilterContext *ctx = link->dst;
00241     YADIFContext *yadif = ctx->priv;
00242 
00243     av_assert0(picref);
00244 
00245     if (yadif->frame_pending)
00246         return_frame(ctx, 1);
00247 
00248     if (yadif->prev)
00249         avfilter_unref_buffer(yadif->prev);
00250     yadif->prev = yadif->cur;
00251     yadif->cur  = yadif->next;
00252     yadif->next = picref;
00253 
00254     if (!yadif->cur)
00255         return;
00256 
00257     if (yadif->auto_enable && !yadif->cur->video->interlaced) {
00258         yadif->out  = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
00259         avfilter_unref_buffer(yadif->prev);
00260         yadif->prev = NULL;
00261         if (yadif->out->pts != AV_NOPTS_VALUE)
00262             yadif->out->pts *= 2;
00263         avfilter_start_frame(ctx->outputs[0], yadif->out);
00264         return;
00265     }
00266 
00267     if (!yadif->prev)
00268         yadif->prev = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
00269 
00270     yadif->out = avfilter_get_video_buffer(ctx->outputs[0], AV_PERM_WRITE | AV_PERM_PRESERVE |
00271                                        AV_PERM_REUSE, link->w, link->h);
00272 
00273     avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
00274     yadif->out->video->interlaced = 0;
00275     if (yadif->out->pts != AV_NOPTS_VALUE)
00276         yadif->out->pts *= 2;
00277     avfilter_start_frame(ctx->outputs[0], yadif->out);
00278 }
00279 
00280 static void end_frame(AVFilterLink *link)
00281 {
00282     AVFilterContext *ctx = link->dst;
00283     YADIFContext *yadif = ctx->priv;
00284 
00285     if (!yadif->out)
00286         return;
00287 
00288     if (yadif->auto_enable && !yadif->cur->video->interlaced) {
00289         avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
00290         avfilter_end_frame(ctx->outputs[0]);
00291         return;
00292     }
00293 
00294     return_frame(ctx, 0);
00295 }
00296 
00297 static int request_frame(AVFilterLink *link)
00298 {
00299     AVFilterContext *ctx = link->src;
00300     YADIFContext *yadif = ctx->priv;
00301 
00302     if (yadif->frame_pending) {
00303         return_frame(ctx, 1);
00304         return 0;
00305     }
00306 
00307     do {
00308         int ret;
00309 
00310         if (yadif->eof)
00311             return AVERROR_EOF;
00312 
00313         ret  = avfilter_request_frame(link->src->inputs[0]);
00314 
00315         if (ret == AVERROR_EOF && yadif->cur) {
00316             AVFilterBufferRef *next = avfilter_ref_buffer(yadif->next, AV_PERM_READ);
00317             next->pts = yadif->next->pts * 2 - yadif->cur->pts;
00318 
00319             start_frame(link->src->inputs[0], next);
00320             end_frame(link->src->inputs[0]);
00321             yadif->eof = 1;
00322         } else if (ret < 0) {
00323             return ret;
00324         }
00325     } while (!yadif->cur);
00326 
00327     return 0;
00328 }
00329 
00330 static int poll_frame(AVFilterLink *link)
00331 {
00332     YADIFContext *yadif = link->src->priv;
00333     int ret, val;
00334 
00335     if (yadif->frame_pending)
00336         return 1;
00337 
00338     val = avfilter_poll_frame(link->src->inputs[0]);
00339     if (val <= 0)
00340         return val;
00341 
00342     if (val >= 1 && !yadif->next) { //FIXME change API to not requre this red tape
00343         if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
00344             return ret;
00345         val = avfilter_poll_frame(link->src->inputs[0]);
00346         if (val <= 0)
00347             return val;
00348     }
00349     assert(yadif->next || !val);
00350 
00351     if (yadif->auto_enable && yadif->next && !yadif->next->video->interlaced)
00352         return val;
00353 
00354     return val * ((yadif->mode&1)+1);
00355 }
00356 
00357 static av_cold void uninit(AVFilterContext *ctx)
00358 {
00359     YADIFContext *yadif = ctx->priv;
00360 
00361     if (yadif->prev) avfilter_unref_buffer(yadif->prev);
00362     if (yadif->cur ) avfilter_unref_buffer(yadif->cur );
00363     if (yadif->next) avfilter_unref_buffer(yadif->next);
00364 }
00365 
00366 static int query_formats(AVFilterContext *ctx)
00367 {
00368     static const enum PixelFormat pix_fmts[] = {
00369         PIX_FMT_YUV420P,
00370         PIX_FMT_YUV422P,
00371         PIX_FMT_YUV444P,
00372         PIX_FMT_YUV410P,
00373         PIX_FMT_YUV411P,
00374         PIX_FMT_GRAY8,
00375         PIX_FMT_YUVJ420P,
00376         PIX_FMT_YUVJ422P,
00377         PIX_FMT_YUVJ444P,
00378         AV_NE( PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE ),
00379         PIX_FMT_YUV440P,
00380         PIX_FMT_YUVJ440P,
00381         AV_NE( PIX_FMT_YUV420P10BE, PIX_FMT_YUV420P10LE ),
00382         AV_NE( PIX_FMT_YUV422P10BE, PIX_FMT_YUV422P10LE ),
00383         AV_NE( PIX_FMT_YUV444P10BE, PIX_FMT_YUV444P10LE ),
00384         AV_NE( PIX_FMT_YUV420P16BE, PIX_FMT_YUV420P16LE ),
00385         AV_NE( PIX_FMT_YUV422P16BE, PIX_FMT_YUV422P16LE ),
00386         AV_NE( PIX_FMT_YUV444P16BE, PIX_FMT_YUV444P16LE ),
00387         PIX_FMT_YUVA420P,
00388         PIX_FMT_YUVA422P,
00389         PIX_FMT_YUVA444P,
00390         PIX_FMT_NONE
00391     };
00392 
00393     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00394 
00395     return 0;
00396 }
00397 
00398 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00399 {
00400     YADIFContext *yadif = ctx->priv;
00401     int cpu_flags = av_get_cpu_flags();
00402 
00403     yadif->mode = 0;
00404     yadif->parity = -1;
00405     yadif->auto_enable = 0;
00406     yadif->csp = NULL;
00407 
00408     if (args) sscanf(args, "%d:%d:%d", &yadif->mode, &yadif->parity, &yadif->auto_enable);
00409 
00410     yadif->filter_line = filter_line_c;
00411     if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3)
00412         yadif->filter_line = ff_yadif_filter_line_ssse3;
00413     else if (HAVE_SSE && cpu_flags & AV_CPU_FLAG_SSE2)
00414         yadif->filter_line = ff_yadif_filter_line_sse2;
00415     else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX)
00416         yadif->filter_line = ff_yadif_filter_line_mmx;
00417 
00418     av_log(ctx, AV_LOG_INFO, "mode:%d parity:%d auto_enable:%d\n", yadif->mode, yadif->parity, yadif->auto_enable);
00419 
00420     return 0;
00421 }
00422 
00423 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
00424 
00425 static int config_props(AVFilterLink *link)
00426 {
00427     link->time_base.num = link->src->inputs[0]->time_base.num;
00428     link->time_base.den = link->src->inputs[0]->time_base.den * 2;
00429     link->w             = link->src->inputs[0]->w;
00430     link->h             = link->src->inputs[0]->h;
00431 
00432     return 0;
00433 }
00434 
00435 AVFilter avfilter_vf_yadif = {
00436     .name          = "yadif",
00437     .description   = NULL_IF_CONFIG_SMALL("Deinterlace the input image."),
00438 
00439     .priv_size     = sizeof(YADIFContext),
00440     .init          = init,
00441     .uninit        = uninit,
00442     .query_formats = query_formats,
00443 
00444     .inputs    = (const AVFilterPad[]) {{ .name       = "default",
00445                                     .type             = AVMEDIA_TYPE_VIDEO,
00446                                     .start_frame      = start_frame,
00447                                     .get_video_buffer = get_video_buffer,
00448                                     .draw_slice       = null_draw_slice,
00449                                     .end_frame        = end_frame,
00450                                     .rej_perms        = AV_PERM_REUSE2, },
00451                                   { .name = NULL}},
00452 
00453     .outputs   = (const AVFilterPad[]) {{ .name       = "default",
00454                                     .type             = AVMEDIA_TYPE_VIDEO,
00455                                     .poll_frame       = poll_frame,
00456                                     .request_frame    = request_frame,
00457                                     .config_props     = config_props, },
00458                                   { .name = NULL}},
00459 };