Port pred4x4_vertical_left_mmxext (H.264 intra prediction) from x264 (authors:

Jason, Loren, Holger) to FFmpeg. Patch by Daniel Kang <daniel dot d dot kang
at gmail com>, as part of Google's GCI 2010.

Originally committed as revision 26155 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/x86/h264_intrapred.asm

@@ -2536,4 +2536,29 @@ cglobal pred4x4_down_left_mmxext, 3,3
     psrlq     m0, 8
     movd      [r1+r2*2], m0
     RET
+
+;-----------------------------------------------------------------------------
+; void pred4x4_vertical_left_mmxext(uint8_t *src, const uint8_t *topright, int stride)
+;-----------------------------------------------------------------------------
+
+INIT_MMX
+cglobal pred4x4_vertical_left_mmxext, 3,3
+    sub       r0, r2
+    movq      m1, [r0]
+    punpckldq m1, [r1]
+    movq      m3, m1
+    movq      m2, m1
+    psrlq     m3, 8
+    psrlq     m2, 16
+    movq      m4, m3
+    pavgb     m4, m1
+    PRED4x4_LOWPASS m0, m1, m2, m3, m5
+    lea       r1, [r0+r2*2]
+    movh      [r0+r2*1], m4
+    movh      [r0+r2*2], m0
+    psrlq     m4, 8
+    psrlq     m0, 8
+    movh      [r1+r2*1], m4
+    movh      [r1+r2*2], m0
+    RET
 %endif

libavcodec/x86/h264_intrapred_init.c

@@ -84,6 +84,7 @@ void ff_pred8x8l_horizontal_down_sse2(uint8_t *src, int has_topleft, int has_top
 void ff_pred8x8l_horizontal_down_ssse3(uint8_t *src, int has_topleft, int has_topright, int stride);
 void ff_pred4x4_dc_mmxext          (uint8_t *src, const uint8_t *topright, int stride);
 void ff_pred4x4_down_left_mmxext   (uint8_t *src, const uint8_t *topright, int stride);
+void ff_pred4x4_vertical_left_mmxext(uint8_t *src, const uint8_t *topright, int stride);
 void ff_pred4x4_tm_vp8_mmx         (uint8_t *src, const uint8_t *topright, int stride);
 void ff_pred4x4_tm_vp8_mmxext      (uint8_t *src, const uint8_t *topright, int stride);
 void ff_pred4x4_tm_vp8_ssse3       (uint8_t *src, const uint8_t *topright, int stride);
@@ -133,6 +134,8 @@ void ff_h264_pred_init_x86(H264PredContext *h, int codec_id)
 #if CONFIG_GPL
         if (codec_id == CODEC_ID_VP8 || codec_id == CODEC_ID_H264)
             h->pred4x4  [DIAG_DOWN_LEFT_PRED ] = ff_pred4x4_down_left_mmxext;
+        if (codec_id == CODEC_ID_SVQ3 || codec_id == CODEC_ID_H264)
+            h->pred4x4  [VERT_LEFT_PRED      ] = ff_pred4x4_vertical_left_mmxext;
         if (codec_id == CODEC_ID_SVQ3 || codec_id == CODEC_ID_H264) {
             h->pred8x8  [TOP_DC_PRED8x8      ] = ff_pred8x8_top_dc_mmxext;
             h->pred8x8  [DC_PRED8x8          ] = ff_pred8x8_dc_mmxext;