From e3fd1857fb9e230de089820f77367ec320188c9c Mon Sep 17 00:00:00 2001
From: Timo Rothenpieler <timo@rothenpieler.org>
Date: Fri, 2 Sep 2016 14:18:25 +0200
Subject: swscale: add unscaled conversion from yuv420p to p010

---
 libswscale/swscale_unscaled.c | 57 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

(limited to 'libswscale/swscale_unscaled.c')

diff --git a/libswscale/swscale_unscaled.c b/libswscale/swscale_unscaled.c
index 716c386..e46763c 100644
--- a/libswscale/swscale_unscaled.c
+++ b/libswscale/swscale_unscaled.c
@@ -33,6 +33,7 @@
 #include "libavutil/bswap.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/avassert.h"
+#include "libavutil/avconfig.h"
 
 DECLARE_ALIGNED(8, static const uint8_t, dithers)[8][8][8]={
 {
@@ -236,6 +237,57 @@ static int planarToP010Wrapper(SwsContext *c, const uint8_t *src8[],
     return srcSliceH;
 }
 
+#if AV_HAVE_BIGENDIAN
+#define output_pixel(p, v) do { \
+        uint16_t *pp = (p); \
+        AV_WL16(pp, (v)); \
+    } while(0)
+#else
+#define output_pixel(p, v) (*p) = (v)
+#endif
+
+static int planar8ToP01xleWrapper(SwsContext *c, const uint8_t *src[],
+                                  int srcStride[], int srcSliceY,
+                                  int srcSliceH, uint8_t *dstParam8[],
+                                  int dstStride[])
+{
+    uint16_t *dstY = (uint16_t*)(dstParam8[0] + dstStride[0] * srcSliceY);
+    uint16_t *dstUV = (uint16_t*)(dstParam8[1] + dstStride[1] * srcSliceY / 2);
+    int x, y, t;
+
+    av_assert0(!(dstStride[0] % 2 || dstStride[1] % 2));
+
+    for (y = 0; y < srcSliceH; y++) {
+        uint16_t *tdstY = dstY;
+        const uint8_t *tsrc0 = src[0];
+        for (x = c->srcW; x > 0; x--) {
+            t = *tsrc0++;
+            output_pixel(tdstY++, t | (t << 8));
+        }
+        src[0] += srcStride[0];
+        dstY += dstStride[0] / 2;
+
+        if (!(y & 1)) {
+            uint16_t *tdstUV = dstUV;
+            const uint8_t *tsrc1 = src[1];
+            const uint8_t *tsrc2 = src[2];
+            for (x = c->srcW / 2; x > 0; x--) {
+                t = *tsrc1++;
+                output_pixel(tdstUV++, t | (t << 8));
+                t = *tsrc2++;
+                output_pixel(tdstUV++, t | (t << 8));
+            }
+            src[1] += srcStride[1];
+            src[2] += srcStride[2];
+            dstUV += dstStride[1] / 2;
+        }
+    }
+
+    return srcSliceH;
+}
+
+#undef output_pixel
+
 static int planarToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
                                int srcStride[], int srcSliceY, int srcSliceH,
                                uint8_t *dstParam[], int dstStride[])
@@ -1653,6 +1705,11 @@ void ff_get_unscaled_swscale(SwsContext *c)
         dstFormat == AV_PIX_FMT_P010) {
         c->swscale = planarToP010Wrapper;
     }
+    /* yuv420p_to_p010le */
+    if ((srcFormat == AV_PIX_FMT_YUV420P || srcFormat == AV_PIX_FMT_YUVA420P) &&
+        dstFormat == AV_PIX_FMT_P010LE) {
+        c->swscale = planar8ToP01xleWrapper;
+    }
 
     if (srcFormat == AV_PIX_FMT_YUV410P && !(dstH & 3) &&
         (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P) &&
-- 
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