From 2e1704059ae8625beda2ffde847ad22c5ba416dc Mon Sep 17 00:00:00 2001
From: Kieran Kunhya <kierank@obe.tv>
Date: Tue, 11 Nov 2014 18:43:42 +0000
Subject: vf_interlace: Add SIMD for lowpass filter

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
---
 libavfilter/vf_interlace.c | 57 +++++++++++++++++++++++-----------------------
 1 file changed, 28 insertions(+), 29 deletions(-)

(limited to 'libavfilter/vf_interlace.c')

diff --git a/libavfilter/vf_interlace.c b/libavfilter/vf_interlace.c
index c534b0ba58..3c36568546 100644
--- a/libavfilter/vf_interlace.c
+++ b/libavfilter/vf_interlace.c
@@ -28,27 +28,10 @@
 
 #include "formats.h"
 #include "avfilter.h"
+#include "interlace.h"
 #include "internal.h"
 #include "video.h"
 
-enum ScanMode {
-    MODE_TFF = 0,
-    MODE_BFF = 1,
-};
-
-enum FieldType {
-    FIELD_UPPER = 0,
-    FIELD_LOWER = 1,
-};
-
-typedef struct InterlaceContext {
-    const AVClass *class;
-    enum ScanMode scan;    // top or bottom field first scanning
-    int lowpass;           // enable or disable low pass filterning
-    AVFrame *cur, *next;   // the two frames from which the new one is obtained
-    int got_output;        // signal an output frame is reday to request_frame()
-} InterlaceContext;
-
 #define OFFSET(x) offsetof(InterlaceContext, x)
 #define V AV_OPT_FLAG_VIDEO_PARAM
 static const AVOption options[] = {
@@ -70,6 +53,19 @@ static const AVClass class = {
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
+static void lowpass_line_c(uint8_t *dstp, ptrdiff_t linesize,
+                           const uint8_t *srcp,
+                           const uint8_t *srcp_above,
+                           const uint8_t *srcp_below)
+{
+    int i;
+    for (i = 0; i < linesize; i++) {
+        // this calculation is an integer representation of
+        // '0.5 * current + 0.25 * above + 0.25 * below'
+        // '1 +' is for rounding.
+        dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
+    }
+}
 
 static const enum AVPixelFormat formats_supported[] = {
     AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV444P,
@@ -116,23 +112,31 @@ static int config_out_props(AVFilterLink *outlink)
     // half framerate
     outlink->time_base.num *= 2;
 
+
+    if (s->lowpass) {
+        s->lowpass_line = lowpass_line_c;
+        if (ARCH_X86)
+            ff_interlace_init_x86(s);
+    }
+
     av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n",
            s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");
 
     return 0;
 }
 
-static void copy_picture_field(AVFrame *src_frame, AVFrame *dst_frame,
+static void copy_picture_field(InterlaceContext *s,
+                               AVFrame *src_frame, AVFrame *dst_frame,
                                AVFilterLink *inlink, enum FieldType field_type,
                                int lowpass)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     int vsub = desc->log2_chroma_h;
-    int plane, i, j;
+    int plane, j;
 
     for (plane = 0; plane < desc->nb_components; plane++) {
         int lines = (plane == 1 || plane == 2) ? -(-inlink->h) >> vsub : inlink->h;
-        int linesize = av_image_get_linesize(inlink->format, inlink->w, plane);
+        ptrdiff_t linesize = av_image_get_linesize(inlink->format, inlink->w, plane);
         uint8_t *dstp = dst_frame->data[plane];
         const uint8_t *srcp = src_frame->data[plane];
 
@@ -153,12 +157,7 @@ static void copy_picture_field(AVFrame *src_frame, AVFrame *dst_frame,
                     srcp_above = srcp; // there is no line above
                 if (j == 1)
                     srcp_below = srcp; // there is no line below
-                for (i = 0; i < linesize; i++) {
-                    // this calculation is an integer representation of
-                    // '0.5 * current + 0.25 * above + 0.25 * below'
-                    // '1 +' is for rounding.
-                    dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
-                }
+                s->lowpass_line(dstp, linesize, srcp, srcp_above, srcp_below);
                 dstp += dstp_linesize;
                 srcp += srcp_linesize;
             }
@@ -209,11 +208,11 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
     out->pts             /= 2;  // adjust pts to new framerate
 
     /* copy upper/lower field from cur */
-    copy_picture_field(s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
+    copy_picture_field(s, s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
     av_frame_free(&s->cur);
 
     /* copy lower/upper field from next */
-    copy_picture_field(s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
+    copy_picture_field(s, s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
     av_frame_free(&s->next);
 
     ret = ff_filter_frame(outlink, out);
-- 
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