diff options
Diffstat (limited to 'libavfilter/vf_yadif.c')
| -rw-r--r-- | libavfilter/vf_yadif.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/libavfilter/vf_yadif.c b/libavfilter/vf_yadif.c new file mode 100644 index 0000000000..b2b2fe58e3 --- /dev/null +++ b/libavfilter/vf_yadif.c @@ -0,0 +1,332 @@ +/* + * Copyright (C) 2006-2010 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with FFmpeg; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "libavutil/cpu.h" +#include "libavutil/x86_cpu.h" +#include "libavutil/common.h" +#include "avfilter.h" +#include "yadif.h" + +#undef NDEBUG +#include <assert.h> + +typedef struct { + /** + * 0: send 1 frame for each frame + * 1: send 1 frame for each field + * 2: like 0 but skips spatial interlacing check + * 3: like 1 but skips spatial interlacing check + */ + int mode; + + /** + * 0: bottom field first + * 1: top field first + * -1: auto-detection + */ + int parity; + + int frame_pending; + + AVFilterBufferRef *cur; + AVFilterBufferRef *next; + AVFilterBufferRef *prev; + AVFilterBufferRef *out; + void (*filter_line)(uint8_t *dst, + uint8_t *prev, uint8_t *cur, uint8_t *next, + int w, int refs, int parity, int mode); +} YADIFContext; + +static void filter_line_c(uint8_t *dst, + uint8_t *prev, uint8_t *cur, uint8_t *next, + int w, int refs, int parity, int mode) +{ + int x; + uint8_t *prev2 = parity ? prev : cur ; + uint8_t *next2 = parity ? cur : next; + for (x = 0; x < w; x++) { + int c = cur[-refs]; + int d = (prev2[0] + next2[0])>>1; + int e = cur[+refs]; + int temporal_diff0 = FFABS(prev2[0] - next2[0]); + int temporal_diff1 =(FFABS(prev[-refs] - c) + FFABS(prev[+refs] - e) )>>1; + int temporal_diff2 =(FFABS(next[-refs] - c) + FFABS(next[+refs] - e) )>>1; + int diff = FFMAX3(temporal_diff0>>1, temporal_diff1, temporal_diff2); + int spatial_pred = (c+e)>>1; + int spatial_score = FFABS(cur[-refs-1] - cur[+refs-1]) + FFABS(c-e) + + FFABS(cur[-refs+1] - cur[+refs+1]) - 1; + +#define CHECK(j)\ + { int score = FFABS(cur[-refs-1+j] - cur[+refs-1-j])\ + + FFABS(cur[-refs +j] - cur[+refs -j])\ + + FFABS(cur[-refs+1+j] - cur[+refs+1-j]);\ + if (score < spatial_score) {\ + spatial_score= score;\ + spatial_pred= (cur[-refs +j] + cur[+refs -j])>>1;\ + + CHECK(-1) CHECK(-2) }} }} + CHECK( 1) CHECK( 2) }} }} + + if (mode < 2) { + int b = (prev2[-2*refs] + next2[-2*refs])>>1; + int f = (prev2[+2*refs] + next2[+2*refs])>>1; +#if 0 + int a = cur[-3*refs]; + int g = cur[+3*refs]; + int max = FFMAX3(d-e, d-c, FFMIN3(FFMAX(b-c,f-e),FFMAX(b-c,b-a),FFMAX(f-g,f-e)) ); + int min = FFMIN3(d-e, d-c, FFMAX3(FFMIN(b-c,f-e),FFMIN(b-c,b-a),FFMIN(f-g,f-e)) ); +#else + int max = FFMAX3(d-e, d-c, FFMIN(b-c, f-e)); + int min = FFMIN3(d-e, d-c, FFMAX(b-c, f-e)); +#endif + + diff = FFMAX3(diff, min, -max); + } + + if (spatial_pred > d + diff) + spatial_pred = d + diff; + else if (spatial_pred < d - diff) + spatial_pred = d - diff; + + dst[0] = spatial_pred; + + dst++; + cur++; + prev++; + next++; + prev2++; + next2++; + } +} + +static void filter(AVFilterContext *ctx, AVFilterBufferRef *dstpic, + int parity, int tff) +{ + YADIFContext *yadif = ctx->priv; + int y, i; + + for (i = 0; i < 3; i++) { + int is_chroma = !!i; + int w = dstpic->video->w >> is_chroma; + int h = dstpic->video->h >> is_chroma; + int refs = yadif->cur->linesize[i]; + + for (y = 0; y < h; y++) { + if ((y ^ parity) & 1) { + uint8_t *prev = &yadif->prev->data[i][y*refs]; + uint8_t *cur = &yadif->cur ->data[i][y*refs]; + uint8_t *next = &yadif->next->data[i][y*refs]; + uint8_t *dst = &dstpic->data[i][y*dstpic->linesize[i]]; + yadif->filter_line(dst, prev, cur, next, w, refs, parity ^ tff, yadif->mode); + } else { + memcpy(&dstpic->data[i][y*dstpic->linesize[i]], + &yadif->cur->data[i][y*refs], w); + } + } + } +#if HAVE_MMX + __asm__ volatile("emms \n\t" : : : "memory"); +#endif +} + +static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h) +{ + AVFilterBufferRef *picref; + int width = FFALIGN(w, 32); + int height= FFALIGN(h+6, 32); + int i; + + picref = avfilter_default_get_video_buffer(link, perms, width, height); + + picref->video->w = w; + picref->video->h = h; + + for (i = 0; i < 3; i++) + picref->data[i] += 3 * picref->linesize[i]; + + return picref; +} + +static void return_frame(AVFilterContext *ctx, int is_second){ + YADIFContext *yadif = ctx->priv; + AVFilterLink *link= ctx->outputs[0]; + int tff = yadif->parity == -1 ? yadif->cur->video->top_field_first : yadif->parity; + + if(is_second) + yadif->out = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE | + AV_PERM_REUSE, link->w, link->h); + + filter(ctx, yadif->out, tff ^ !is_second, tff); + + if(is_second) + avfilter_start_frame(ctx->outputs[0], yadif->out); + avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1); + avfilter_end_frame(ctx->outputs[0]); + + yadif->frame_pending= (yadif->mode&1) && !is_second; +} + +static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref) +{ + AVFilterContext *ctx = link->dst; + YADIFContext *yadif = ctx->priv; + + if(yadif->frame_pending) + return_frame(ctx, 1); + + if (yadif->prev) + avfilter_unref_buffer(yadif->prev); + yadif->prev = yadif->cur; + yadif->cur = yadif->next; + yadif->next = picref; + + if (!yadif->prev) + yadif->prev = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE | + AV_PERM_REUSE, link->w, link->h); + + if(!yadif->cur) + return; + + yadif->out = avfilter_get_video_buffer(ctx->outputs[0], AV_PERM_WRITE | AV_PERM_PRESERVE | + AV_PERM_REUSE, link->w, link->h); + + yadif->out->pts = yadif->cur->pts; + avfilter_start_frame(ctx->outputs[0], yadif->out); +} + +static void end_frame(AVFilterLink *link) +{ + AVFilterContext *ctx = link->dst; + YADIFContext *yadif = ctx->priv; + + if(!yadif->out) + return; + + return_frame(ctx, 0); +} + +static int request_frame(AVFilterLink *link) +{ + AVFilterContext *ctx = link->src; + YADIFContext *yadif = ctx->priv; + + if(yadif->frame_pending){ + return_frame(ctx, 1); + return 0; + } + + do{ + int ret; + + if ((ret = avfilter_request_frame(link->src->inputs[0]))) + return ret; + }while(!yadif->cur); + + return 0; +} + +static int poll_frame(AVFilterLink *link) +{ + YADIFContext *yadif = link->src->priv; + int ret, val; + + if(yadif->frame_pending) + return 1; + + val= avfilter_poll_frame(link->src->inputs[0]); + + if(val==1 && !yadif->next){ //FIXME change API to not requre this red tape + if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0) + return ret; + val = avfilter_poll_frame(link->src->inputs[0]); + } + assert(yadif->next); + + return val * ((yadif->mode&1)+1); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + YADIFContext *yadif = ctx->priv; + + if (yadif->prev) avfilter_unref_buffer(yadif->prev); + if (yadif->cur ) avfilter_unref_buffer(yadif->cur ); + if (yadif->next) avfilter_unref_buffer(yadif->next); +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum PixelFormat pix_fmts[] = { + PIX_FMT_YUV420P, + PIX_FMT_GRAY8, + PIX_FMT_NONE + }; + + avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); + + return 0; +} + +static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) +{ + YADIFContext *yadif = ctx->priv; + av_unused int cpu_flags = av_get_cpu_flags(); + + yadif->mode = 0; + yadif->parity = -1; + + if (args) sscanf(args, "%d:%d", &yadif->mode, &yadif->parity); + + yadif->filter_line = filter_line_c; +#if HAVE_MMX + if (cpu_flags & AV_CPU_FLAG_MMX) + yadif->filter_line = ff_yadif_filter_line_mmx; +#endif + + av_log(ctx, AV_LOG_INFO, "mode:%d parity:%d\n", yadif->mode, yadif->parity); + + return 0; +} + +static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { } + +AVFilter avfilter_vf_yadif = { + .name = "yadif", + .description = NULL_IF_CONFIG_SMALL("Deinterlace the input image"), + + .priv_size = sizeof(YADIFContext), + .init = init, + .uninit = uninit, + .query_formats = query_formats, + + .inputs = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .start_frame = start_frame, + .get_video_buffer = get_video_buffer, + .draw_slice = null_draw_slice, + .end_frame = end_frame, }, + { .name = NULL}}, + + .outputs = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .poll_frame = poll_frame, + .request_frame = request_frame, }, + { .name = NULL}}, +}; |