From df0743e01e9fb88b9eb67815bacc2fe89e313eff Mon Sep 17 00:00:00 2001
From: Baptiste Coudurier <baptiste.coudurier@gmail.com>
Date: Mon, 27 Sep 2010 22:24:03 +0000
Subject: [PATCH] Y400A (gray alpha) input support in libswscale

Originally committed as revision 32394 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
---
 libswscale/swscale.c          | 42 +++++++++++++++++++++++++++++++++--
 libswscale/swscale_internal.h |  4 +++-
 libswscale/swscale_template.c |  5 +++++
 libswscale/utils.c            |  1 +
 4 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index fbfc006a98..aa400f6094 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -82,6 +82,7 @@ untested special converters
            (x)==PIX_FMT_PAL8        \
         || (x)==PIX_FMT_YUYV422     \
         || (x)==PIX_FMT_UYVY422     \
+        || (x)==PIX_FMT_Y400A       \
         || isAnyRGB(x)              \
     )
 
@@ -1435,6 +1436,34 @@ static int uyvyToYuv422Wrapper(SwsContext *c, const uint8_t* src[], int srcStrid
     return srcSliceH;
 }
 
+static void gray8aToPacked32(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
+{
+    long i;
+    for (i=0; i<num_pixels; i++)
+        ((uint32_t *) dst)[i] = ((const uint32_t *)palette)[src[i<<1]] | (src[(i<<1)+1] << 24);
+}
+
+static void gray8aToPacked32_1(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
+{
+    long i;
+
+    for (i=0; i<num_pixels; i++)
+        ((uint32_t *) dst)[i] = ((const uint32_t *)palette)[src[i<<1]] | src[(i<<1)+1];
+}
+
+static void gray8aToPacked24(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
+{
+    long i;
+
+    for (i=0; i<num_pixels; i++) {
+        //FIXME slow?
+        dst[0]= palette[src[i<<1]*4+0];
+        dst[1]= palette[src[i<<1]*4+1];
+        dst[2]= palette[src[i<<1]*4+2];
+        dst+= 3;
+    }
+}
+
 static int palToRgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
                            int srcSliceH, uint8_t* dst[], int dstStride[])
 {
@@ -1446,7 +1475,16 @@ static int palToRgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[],
     uint8_t *dstPtr= dst[0] + dstStride[0]*srcSliceY;
     const uint8_t *srcPtr= src[0];
 
-    if (usePal(srcFormat)) {
+    if (srcFormat == PIX_FMT_Y400A) {
+        switch (dstFormat) {
+        case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;
+        case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;
+        case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;
+        case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;
+        case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;
+        case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;
+        }
+    } else if (usePal(srcFormat)) {
         switch (dstFormat) {
         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;
         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;
@@ -1903,7 +1941,7 @@ int sws_scale(SwsContext *c, const uint8_t* const src[], const int srcStride[],
                 r= (i>>3    )*255;
                 g= ((i>>1)&3)*85;
                 b= (i&1     )*255;
-            } else if(c->srcFormat == PIX_FMT_GRAY8) {
+            } else if(c->srcFormat == PIX_FMT_GRAY8 || PIX_FMT_Y400A) {
                 r = g = b = i;
             } else {
                 assert(c->srcFormat == PIX_FMT_BGR4_BYTE);
diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index d5df2988f3..19dff8f37b 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -378,6 +378,7 @@ const char *sws_format_name(enum PixelFormat format);
     )
 #define isGray(x)       (           \
            (x)==PIX_FMT_GRAY8       \
+        || (x)==PIX_FMT_Y400A      \
         || (x)==PIX_FMT_GRAY16BE    \
         || (x)==PIX_FMT_GRAY16LE    \
     )
@@ -440,9 +441,10 @@ const char *sws_format_name(enum PixelFormat format);
         || (x)==PIX_FMT_BGR32_1     \
         || (x)==PIX_FMT_RGB32       \
         || (x)==PIX_FMT_RGB32_1     \
+        || (x)==PIX_FMT_Y400A       \
         || (x)==PIX_FMT_YUVA420P    \
     )
-#define usePal(x) (av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL)
+#define usePal(x) ((av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL) || (x) == PIX_FMT_Y400A)
 
 extern const uint64_t ff_dither4[2];
 extern const uint64_t ff_dither8[2];
diff --git a/libswscale/swscale_template.c b/libswscale/swscale_template.c
index 42c4a8ba5f..34868ac5cc 100644
--- a/libswscale/swscale_template.c
+++ b/libswscale/swscale_template.c
@@ -3001,6 +3001,7 @@ static void RENAME(sws_init_swScale)(SwsContext *c)
     case PIX_FMT_YUV420P16BE:
     case PIX_FMT_YUV422P16BE:
     case PIX_FMT_YUV444P16BE:
+    case PIX_FMT_Y400A    :
     case PIX_FMT_GRAY16BE : c->lumToYV12 = RENAME(yuy2ToY); break;
     case PIX_FMT_UYVY422  :
     case PIX_FMT_YUV420P16LE:
@@ -3033,10 +3034,14 @@ static void RENAME(sws_init_swScale)(SwsContext *c)
         case PIX_FMT_RGB32_1:
         case PIX_FMT_BGR32  :
         case PIX_FMT_BGR32_1: c->alpToYV12 = abgrToA; break;
+        case PIX_FMT_Y400A  : c->alpToYV12 = RENAME(yuy2ToY); break;
         }
     }
 
     switch (srcFormat) {
+    case PIX_FMT_Y400A  :
+        c->alpSrcOffset = 1;
+        break;
     case PIX_FMT_RGB32  :
     case PIX_FMT_BGR32  :
         c->alpSrcOffset = 3;
diff --git a/libswscale/utils.c b/libswscale/utils.c
index b52a7937b0..c817a4d997 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -81,6 +81,7 @@ const char *swscale_license(void)
         || (x)==PIX_FMT_RGB565      \
         || (x)==PIX_FMT_RGB555      \
         || (x)==PIX_FMT_GRAY8       \
+        || (x)==PIX_FMT_Y400A       \
         || (x)==PIX_FMT_YUV410P     \
         || (x)==PIX_FMT_YUV440P     \
         || (x)==PIX_FMT_NV12        \