From aac8b76983e340bc744d3542d676f72efa3b474f Mon Sep 17 00:00:00 2001
From: Jason Garrett-Glaser <darkshikari@gmail.com>
Date: Fri, 19 Dec 2008 14:49:17 +0000
Subject: [PATCH] H.264 loopfilter speed tweaks

Originally committed as revision 16240 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/h264.c     | 28 ++++++++++++++--------
 libavcodec/h264data.h | 56 +++++++++++++++++++++----------------------
 2 files changed, 46 insertions(+), 38 deletions(-)

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index ec199335c5..5a2bb7f5c2 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -5848,8 +5848,10 @@ static void filter_mb_edgev( H264Context *h, uint8_t *pix, int stride, int16_t b
 
     if( bS[0] < 4 ) {
         int8_t tc[4];
-        for(i=0; i<4; i++)
-            tc[i] = bS[i] ? (tc0_table+52)[index_a][bS[i] - 1] : -1;
+        tc[0] = (tc0_table+52)[index_a][bS[0]];
+        tc[1] = (tc0_table+52)[index_a][bS[1]];
+        tc[2] = (tc0_table+52)[index_a][bS[2]];
+        tc[3] = (tc0_table+52)[index_a][bS[3]];
         h->s.dsp.h264_h_loop_filter_luma(pix, stride, alpha, beta, tc);
     } else {
         h->s.dsp.h264_h_loop_filter_luma_intra(pix, stride, alpha, beta);
@@ -5863,8 +5865,10 @@ static void filter_mb_edgecv( H264Context *h, uint8_t *pix, int stride, int16_t
 
     if( bS[0] < 4 ) {
         int8_t tc[4];
-        for(i=0; i<4; i++)
-            tc[i] = bS[i] ? (tc0_table+52)[index_a][bS[i] - 1] + 1 : 0;
+        tc[0] = (tc0_table+52)[index_a][bS[0]]+1;
+        tc[1] = (tc0_table+52)[index_a][bS[1]]+1;
+        tc[2] = (tc0_table+52)[index_a][bS[2]]+1;
+        tc[3] = (tc0_table+52)[index_a][bS[3]]+1;
         h->s.dsp.h264_h_loop_filter_chroma(pix, stride, alpha, beta, tc);
     } else {
         h->s.dsp.h264_h_loop_filter_chroma_intra(pix, stride, alpha, beta);
@@ -5895,7 +5899,7 @@ static void filter_mb_mbaff_edgev( H264Context *h, uint8_t *pix, int stride, int
         beta  = (beta_table+52)[qp[qp_index] + h->slice_beta_offset];
 
         if( bS[bS_index] < 4 ) {
-            const int tc0 = (tc0_table+52)[index_a][bS[bS_index] - 1];
+            const int tc0 = (tc0_table+52)[index_a][bS[bS_index]];
             const int p0 = pix[-1];
             const int p1 = pix[-2];
             const int p2 = pix[-3];
@@ -5989,7 +5993,7 @@ static void filter_mb_mbaff_edgecv( H264Context *h, uint8_t *pix, int stride, in
         beta  = (beta_table+52)[qp[qp_index] + h->slice_beta_offset];
 
         if( bS[bS_index] < 4 ) {
-            const int tc = (tc0_table+52)[index_a][bS[bS_index] - 1] + 1;
+            const int tc = (tc0_table+52)[index_a][bS[bS_index]] + 1;
             const int p0 = pix[-1];
             const int p1 = pix[-2];
             const int q0 = pix[0];
@@ -6031,8 +6035,10 @@ static void filter_mb_edgeh( H264Context *h, uint8_t *pix, int stride, int16_t b
 
     if( bS[0] < 4 ) {
         int8_t tc[4];
-        for(i=0; i<4; i++)
-            tc[i] = bS[i] ? (tc0_table+52)[index_a][bS[i] - 1] : -1;
+        tc[0] = (tc0_table+52)[index_a][bS[0]];
+        tc[1] = (tc0_table+52)[index_a][bS[1]];
+        tc[2] = (tc0_table+52)[index_a][bS[2]];
+        tc[3] = (tc0_table+52)[index_a][bS[3]];
         h->s.dsp.h264_v_loop_filter_luma(pix, stride, alpha, beta, tc);
     } else {
         h->s.dsp.h264_v_loop_filter_luma_intra(pix, stride, alpha, beta);
@@ -6047,8 +6053,10 @@ static void filter_mb_edgech( H264Context *h, uint8_t *pix, int stride, int16_t
 
     if( bS[0] < 4 ) {
         int8_t tc[4];
-        for(i=0; i<4; i++)
-            tc[i] = bS[i] ? (tc0_table+52)[index_a][bS[i] - 1] + 1 : 0;
+        tc[0] = (tc0_table+52)[index_a][bS[0]]+1;
+        tc[1] = (tc0_table+52)[index_a][bS[1]]+1;
+        tc[2] = (tc0_table+52)[index_a][bS[2]]+1;
+        tc[3] = (tc0_table+52)[index_a][bS[3]]+1;
         h->s.dsp.h264_v_loop_filter_chroma(pix, stride, alpha, beta, tc);
     } else {
         h->s.dsp.h264_v_loop_filter_chroma_intra(pix, stride, alpha, beta);
diff --git a/libavcodec/h264data.h b/libavcodec/h264data.h
index 4031d9dd65..20ea3bb08d 100644
--- a/libavcodec/h264data.h
+++ b/libavcodec/h264data.h
@@ -547,34 +547,34 @@ static const uint8_t beta_table[52*3] = {
     18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
     18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
 };
-static const uint8_t tc0_table[52*3][3] = {
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
-    { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 1 },
-    { 0, 0, 1 }, { 0, 0, 1 }, { 0, 0, 1 }, { 0, 1, 1 }, { 0, 1, 1 }, { 1, 1, 1 },
-    { 1, 1, 1 }, { 1, 1, 1 }, { 1, 1, 1 }, { 1, 1, 2 }, { 1, 1, 2 }, { 1, 1, 2 },
-    { 1, 1, 2 }, { 1, 2, 3 }, { 1, 2, 3 }, { 2, 2, 3 }, { 2, 2, 4 }, { 2, 3, 4 },
-    { 2, 3, 4 }, { 3, 3, 5 }, { 3, 4, 6 }, { 3, 4, 6 }, { 4, 5, 7 }, { 4, 5, 8 },
-    { 4, 6, 9 }, { 5, 7,10 }, { 6, 8,11 }, { 6, 8,13 }, { 7,10,14 }, { 8,11,16 },
-    { 9,12,18 }, {10,13,20 }, {11,15,23 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
-    {13,17,25 }, {13,17,25 }, {13,17,25 }, {13,17,25 },
+static const uint8_t tc0_table[52*3][4] = {
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 },
+    {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 0 }, {-1, 0, 0, 1 },
+    {-1, 0, 0, 1 }, {-1, 0, 0, 1 }, {-1, 0, 0, 1 }, {-1, 0, 1, 1 }, {-1, 0, 1, 1 }, {-1, 1, 1, 1 },
+    {-1, 1, 1, 1 }, {-1, 1, 1, 1 }, {-1, 1, 1, 1 }, {-1, 1, 1, 2 }, {-1, 1, 1, 2 }, {-1, 1, 1, 2 },
+    {-1, 1, 1, 2 }, {-1, 1, 2, 3 }, {-1, 1, 2, 3 }, {-1, 2, 2, 3 }, {-1, 2, 2, 4 }, {-1, 2, 3, 4 },
+    {-1, 2, 3, 4 }, {-1, 3, 3, 5 }, {-1, 3, 4, 6 }, {-1, 3, 4, 6 }, {-1, 4, 5, 7 }, {-1, 4, 5, 8 },
+    {-1, 4, 6, 9 }, {-1, 5, 7,10 }, {-1, 6, 8,11 }, {-1, 6, 8,13 }, {-1, 7,10,14 }, {-1, 8,11,16 },
+    {-1, 9,12,18 }, {-1,10,13,20 }, {-1,11,15,23 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
+    {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 }, {-1,13,17,25 },
 };
 
 /* Cabac pre state table */