altivec support for snow

Originally committed as revision 5228 to svn://svn.ffmpeg.org/ffmpeg/trunk

MAINTAINERS

@@ -212,3 +212,4 @@ BeOS                                    Francois Revol
 i386                                    Michael Niedermayer
 Mac OS X / PowerPC                      Romain Dolbeau
 Amiga / PowerPC                         Colin Ward
+Linux / PowerPC                         Luca Barbato

libavcodec/Makefile

@@ -388,7 +388,7 @@ endif
 ifeq ($(TARGET_ALTIVEC),yes)
 OBJS += ppc/dsputil_altivec.o ppc/mpegvideo_altivec.o ppc/idct_altivec.o \
         ppc/fft_altivec.o ppc/gmc_altivec.o ppc/fdct_altivec.o \
-        ppc/dsputil_h264_altivec.o
+        ppc/dsputil_h264_altivec.o ppc/dsputil_snow_altivec.o
 endif
 
 ifeq ($(TARGET_ARCH_SH4),yes)

libavcodec/i386/snowdsp_mmx.c

@@ -21,35 +21,6 @@
 #include "../snow.h"
 #include "mmx.h"
 
-static void always_inline snow_interleave_line_header(int * i, int width, DWTELEM * low, DWTELEM * high){
-    (*i) = (width) - 2;
-
-    if (width & 1){
-        low[(*i)+1] = low[((*i)+1)>>1];
-        (*i)--;
-    }
-}
-
-static void always_inline snow_horizontal_compose_lift_lead_out(int i, DWTELEM * dst, DWTELEM * src, DWTELEM * ref, int width, int w, int lift_high, int mul, int add, int shift){
-    for(; i<w; i++){
-        dst[i] = src[i] - ((mul * (ref[i] + ref[i + 1]) + add) >> shift);
-    }
-
-    if((width^lift_high)&1){
-        dst[w] = src[w] - ((mul * 2 * ref[w] + add) >> shift);
-    }
-}
-
-static void always_inline snow_horizontal_compose_liftS_lead_out(int i, DWTELEM * dst, DWTELEM * src, DWTELEM * ref, int width, int w){
-        for(; i<w; i++){
-            dst[i] = src[i] - (((-(ref[i] + ref[(i+1)])+W_BO) - 4 * src[i]) >> W_BS);
-        }
-
-        if(width&1){
-            dst[w] = src[w] - (((-2 * ref[w] + W_BO) - 4 * src[w]) >> W_BS);
-        }
-}
-
 void ff_snow_horizontal_compose97i_sse2(DWTELEM *b, int width){
     const int w2= (width+1)>>1;
     // SSE2 code runs faster with pointers aligned on a 32-byte boundary.

libavcodec/ppc/dsputil_ppc.c

@@ -30,6 +30,17 @@ extern void fdct_altivec(int16_t *block);
 extern void idct_put_altivec(uint8_t *dest, int line_size, int16_t *block);
 extern void idct_add_altivec(uint8_t *dest, int line_size, int16_t *block);
 
+extern void ff_snow_horizontal_compose97i_altivec(DWTELEM *b, int width);
+extern void ff_snow_vertical_compose97i_altivec(DWTELEM *b0, DWTELEM *b1,
+                                                DWTELEM *b2, DWTELEM *b3,
+                                                DWTELEM *b4, DWTELEM *b5,
+                                                int width);
+extern void ff_snow_inner_add_yblock_altivec(uint8_t *obmc, const int obmc_stride,
+                                          uint8_t * * block, int b_w, int b_h,
+                                          int src_x, int src_y, int src_stride,
+                                          slice_buffer * sb, int add,
+                                          uint8_t * dst8);
+
 int mm_flags = 0;
 
 int mm_support(void)
@@ -297,6 +308,11 @@ void dsputil_init_ppc(DSPContext* c, AVCodecContext *avctx)
         c->hadamard8_diff[1] = hadamard8_diff8x8_altivec;
 #endif
 
+
+        c->horizontal_compose97i = ff_snow_horizontal_compose97i_altivec;
+        c->vertical_compose97i = ff_snow_vertical_compose97i_altivec;
+        c->inner_add_yblock = ff_snow_inner_add_yblock_altivec;
+
 #ifdef CONFIG_ENCODERS
         if (avctx->dct_algo == FF_DCT_AUTO ||
             avctx->dct_algo == FF_DCT_ALTIVEC)

libavcodec/snow.h

@@ -120,4 +120,43 @@ extern void ff_snow_vertical_compose97i(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, D
 extern void ff_snow_horizontal_compose97i(DWTELEM *b, int width);
 extern void ff_snow_inner_add_yblock(uint8_t *obmc, const int obmc_stride, uint8_t * * block, int b_w, int b_h, int src_x, int src_y, int src_stride, slice_buffer * sb, int add, uint8_t * dst8);
 
+
+/* C bits used by mmx/sse2/altivec */
+
+static always_inline void snow_interleave_line_header(int * i, int width, DWTELEM * low, DWTELEM * high){
+    (*i) = (width) - 2;
+
+    if (width & 1){
+        low[(*i)+1] = low[((*i)+1)>>1];
+        (*i)--;
+    }
+}
+
+static always_inline void snow_interleave_line_footer(int * i, DWTELEM * low, DWTELEM * high){
+    for (; (*i)>=0; (*i)-=2){
+        low[(*i)+1] = high[(*i)>>1];
+        low[*i] = low[(*i)>>1];
+    }
+}
+
+static always_inline void snow_horizontal_compose_lift_lead_out(int i, DWTELEM * dst, DWTELEM * src, DWTELEM * ref, int width, int w, int lift_high, int mul, int add, int shift){
+    for(; i<w; i++){
+        dst[i] = src[i] - ((mul * (ref[i] + ref[i + 1]) + add) >> shift);
+    }
+
+    if((width^lift_high)&1){
+        dst[w] = src[w] - ((mul * 2 * ref[w] + add) >> shift);
+    }
+}
+
+static always_inline void snow_horizontal_compose_liftS_lead_out(int i, DWTELEM * dst, DWTELEM * src, DWTELEM * ref, int width, int w){
+        for(; i<w; i++){
+            dst[i] = src[i] - (((-(ref[i] + ref[(i+1)])+W_BO) - 4 * src[i]) >> W_BS);
+        }
+
+        if(width&1){
+            dst[w] = src[w] - (((-2 * ref[w] + W_BO) - 4 * src[w]) >> W_BS);
+        }
+}
+
 #endif