From b0c1455aa4c9fc319d91fe340fa4f6766e2ad898 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Thu, 7 Jan 2016 16:21:26 +0100
Subject: img_format: add a generic flag for semi-planar formats

---
 video/img_format.c | 30 ++++++++++++++++++++++++++----
 video/img_format.h |  4 ++++
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/video/img_format.c b/video/img_format.c
index 89f6ebac27..c9bdd763b0 100644
--- a/video/img_format.c
+++ b/video/img_format.c
@@ -184,11 +184,14 @@ struct mp_imgfmt_desc mp_imgfmt_get_desc(int mpfmt)
     // Check whether any components overlap other components (per plane).
     // We're cheating/simplifying here: we assume that this happens if a shift
     // is set - which is wrong in general (could be needed for padding, instead
-    // of overlapping bits of another component). Needed for rgb444le/be.
+    // of overlapping bits of another component - use the "< 8" test to exclude
+    // "normal" formats which use this for padding, like p010).
+    // Needed for rgb444le/be.
     bool component_byte_overlap = false;
     for (int c = 0; c < pd->nb_components; c++) {
         AVComponentDescriptor d = pd->comp[c];
-        component_byte_overlap |= d.shift > 0 && planedepth[d.plane] > 8;
+        component_byte_overlap |= d.shift > 0 && planedepth[d.plane] > 8 &&
+                                  desc.component_bits < 8;
     }
 
     // If every component sits in its own byte, or all components are within
@@ -240,6 +243,7 @@ struct mp_imgfmt_desc mp_imgfmt_get_desc(int mpfmt)
     if ((desc.flags & (MP_IMGFLAG_YUV | MP_IMGFLAG_RGB))
         && (desc.flags & MP_IMGFLAG_BYTE_ALIGNED)
         && !(pd->flags & AV_PIX_FMT_FLAG_PAL)
+        && !component_byte_overlap
         && shift >= 0)
     {
         bool same_depth = true;
@@ -248,14 +252,27 @@ struct mp_imgfmt_desc mp_imgfmt_get_desc(int mpfmt)
                           desc.bpp[p] == desc.bpp[0];
         }
         if (same_depth && pd->nb_components == desc.num_planes) {
-            desc.component_bits += shift;
-            desc.component_full_bits = (desc.component_bits + shift + 7) / 8 * 8;
             if (desc.flags & MP_IMGFLAG_YUV) {
                 desc.flags |= MP_IMGFLAG_YUV_P;
             } else {
                 desc.flags |= MP_IMGFLAG_RGB_P;
             }
         }
+        if (pd->nb_components == 3 && desc.num_planes == 2 &&
+            planedepth[1] == planedepth[0] * 2 &&
+            desc.bpp[1] == desc.bpp[0] * 2 &&
+            (desc.flags & MP_IMGFLAG_YUV))
+        {
+
+            desc.flags |= MP_IMGFLAG_YUV_NV;
+            if (pd->comp[1].offset > pd->comp[2].offset)
+                desc.flags |= MP_IMGFLAG_YUV_NV_SWAP;
+        }
+        if (desc.flags & (MP_IMGFLAG_YUV_P | MP_IMGFLAG_RGB_P | MP_IMGFLAG_YUV_NV))
+        {
+            desc.component_bits += shift;
+            desc.component_full_bits = (desc.component_bits + shift + 7) / 8 * 8;
+        }
     }
 
     for (int p = 0; p < desc.num_planes; p++) {
@@ -340,6 +357,8 @@ int main(int argc, char **argv)
         FLAG(MP_IMGFLAG_ALPHA, "a")
         FLAG(MP_IMGFLAG_PLANAR, "P")
         FLAG(MP_IMGFLAG_YUV_P, "YUVP")
+        FLAG(MP_IMGFLAG_YUV_NV, "NV")
+        FLAG(MP_IMGFLAG_YUV_NV_SWAP, "NVSWAP")
         FLAG(MP_IMGFLAG_YUV, "yuv")
         FLAG(MP_IMGFLAG_RGB, "rgb")
         FLAG(MP_IMGFLAG_XYZ, "xyz")
@@ -351,6 +370,9 @@ int main(int argc, char **argv)
         printf("  planes=%d, chroma=%d:%d align=%d:%d bits=%d cbits=%d\n",
                d.num_planes, d.chroma_xs, d.chroma_ys, d.align_x, d.align_y,
                d.plane_bits, d.component_bits);
+        printf("  planes=%d, chroma=%d:%d align=%d:%d bits=%d cbits=%d cfbits=%d\n",
+               d.num_planes, d.chroma_xs, d.chroma_ys, d.align_x, d.align_y,
+               d.plane_bits, d.component_bits, d.component_full_bits);
         printf("  {");
         for (int n = 0; n < MP_MAX_PLANES; n++)
             printf("%d/%d/[%d:%d] ", d.bytes[n], d.bpp[n], d.xs[n], d.ys[n]);
diff --git a/video/img_format.h b/video/img_format.h
index 9dbc2eedf2..80acb2b3be 100644
--- a/video/img_format.h
+++ b/video/img_format.h
@@ -70,6 +70,10 @@
 // Like MP_IMGFLAG_YUV_P, but RGB. This can be e.g. AV_PIX_FMT_GBRP. The planes
 // are always shuffled (G - B - R [- A]).
 #define MP_IMGFLAG_RGB_P 0x40000
+// Semi-planar YUV formats, like AV_PIX_FMT_NV12.
+// The flag MP_IMGFLAG_YUV_NV_SWAP is set for AV_PIX_FMT_NV21.
+#define MP_IMGFLAG_YUV_NV 0x80000
+#define MP_IMGFLAG_YUV_NV_SWAP 0x100000
 
 // Exactly one of these bits is set in mp_imgfmt_desc.flags
 #define MP_IMGFLAG_COLOR_CLASS_MASK \
-- 
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