From: Maksym Veremeyenko <verem@m1.tv>
Date: Thu, 13 Feb 2014 14:27:23 +0000 (+0200)
Subject: implement SSE optimized swab function
X-Git-Url: https://git.sesse.net/?p=mlt;a=commitdiff_plain;h=f299d75d186d9faa0b3f93ac04aab3cb5a8559df

implement SSE optimized swab function
---

diff --git a/src/modules/decklink/common.cpp b/src/modules/decklink/common.cpp
index 83f5e531..cafdda9f 100644
--- a/src/modules/decklink/common.cpp
+++ b/src/modules/decklink/common.cpp
@@ -19,6 +19,7 @@
 
 #include "common.h"
 #include <stdlib.h>
+#include <unistd.h>
 
 #ifdef __DARWIN__
 
@@ -89,3 +90,46 @@ void freeDLString( DLString aDLString )
 
 #endif
 
+
+void swab2( const void *from, void *to, int n )
+{
+#if defined(USE_SSE)
+#define SWAB_STEP 16
+	__asm__ volatile
+	(
+		"loop_start:                            \n\t"
+
+		/* load */
+		"movdqa         0(%[from]), %%xmm0      \n\t"
+		"add            $0x10, %[from]          \n\t"
+
+		/* duplicate to temp registers */
+		"movdqa         %%xmm0, %%xmm1          \n\t"
+
+		/* shift right temp register */
+		"psrlw          $8, %%xmm1              \n\t"
+
+		/* shift left main register */
+		"psllw          $8, %%xmm0              \n\t"
+
+		/* compose them back */
+		"por           %%xmm0, %%xmm1           \n\t"
+
+		/* save */
+		"movdqa         %%xmm1, 0(%[to])        \n\t"
+		"add            $0x10, %[to]            \n\t"
+
+		"dec            %[cnt]                  \n\t"
+		"jnz            loop_start              \n\t"
+
+		:
+		: [from]"r"(from), [to]"r"(to), [cnt]"r"(n / SWAB_STEP)
+		: "xmm0", "xmm1"
+	);
+
+	from = (unsigned char*) from + n - (n % SWAB_STEP);
+	to = (unsigned char*) to + n - (n % SWAB_STEP);
+	n = (n % SWAB_STEP);
+#endif
+	swab(from, to, n);
+};
diff --git a/src/modules/decklink/common.h b/src/modules/decklink/common.h
index 3b48b9c0..98a85361 100644
--- a/src/modules/decklink/common.h
+++ b/src/modules/decklink/common.h
@@ -38,5 +38,6 @@
 char* getCString( DLString aDLString );
 void freeCString( char* aCString );
 void freeDLString( DLString aDLString );
+void swab2( const void *from, void *to, int n );
 
 #endif // DECKLINK_COMMON_H
diff --git a/src/modules/decklink/consumer_decklink.cpp b/src/modules/decklink/consumer_decklink.cpp
index 8f01dea5..ac6f5a92 100644
--- a/src/modules/decklink/consumer_decklink.cpp
+++ b/src/modules/decklink/consumer_decklink.cpp
@@ -416,9 +416,9 @@ public:
 					// Normal non-keyer playout - needs byte swapping
 					if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 						// convert lower field first to top field first
-						swab( (char*) image, (char*) buffer + stride, stride * ( height - 1 ) );
+						swab2( (char*) image, (char*) buffer + stride, stride * ( height - 1 ) );
 					else
-						swab( (char*) image, (char*) buffer, stride * height );
+						swab2( (char*) image, (char*) buffer, stride * height );
 				}
 				else if ( !mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "test_image" ) )
 				{
diff --git a/src/modules/decklink/producer_decklink.cpp b/src/modules/decklink/producer_decklink.cpp
index 94348938..6801fad8 100644
--- a/src/modules/decklink/producer_decklink.cpp
+++ b/src/modules/decklink/producer_decklink.cpp
@@ -432,7 +432,7 @@ public:
 						for ( int i = 1; i < m_vancLines + 1; i++ )
 						{
 							if ( vanc->GetBufferForVerticalBlankingLine( i, &buffer ) == S_OK )
-								swab( (char*) buffer, (char*) image + ( i - 1 ) * video->GetRowBytes(), video->GetRowBytes() );
+								swab2( (char*) buffer, (char*) image + ( i - 1 ) * video->GetRowBytes(), video->GetRowBytes() );
 							else
 								mlt_log_debug( getProducer(), "failed capture vanc line %d\n", i );
 						}
@@ -445,7 +445,7 @@ public:
 				if ( image && buffer )
 				{
 					size =  video->GetRowBytes() * video->GetHeight();
-					swab( (char*) buffer, (char*) image + m_vancLines * video->GetRowBytes(), size );
+					swab2( (char*) buffer, (char*) image + m_vancLines * video->GetRowBytes(), size );
 					mlt_frame_set_image( frame, (uint8_t*) image, size, mlt_pool_release );
 				}
 				else if ( image )