yadif filter, based on stefanos port of my yadif from mplayer.

Compared to stefanos, 2 frame output works with ffplay.

Originally committed as revision 25196 to svn://svn.ffmpeg.org/ffmpeg/trunk

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}},
+};