AltiVec optimized fdct patch by (James Klicman <james at klicman dot org>)

Originally committed as revision 2439 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -143,7 +143,7 @@ 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/fft_altivec.o ppc/gmc_altivec.o ppc/fdct_altivec.o
 endif
 
 ifeq ($(TARGET_ARCH_SH4),yes)

libavcodec/ppc/dsputil_ppc.c

@@ -25,6 +25,7 @@
 #include "dsputil_altivec.h"
 #endif
 
+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);
 
@@ -48,6 +49,7 @@ static unsigned char* perfname[] = {
   "fft_calc_altivec",
   "gmc1_altivec",
   "dct_unquantize_h263_altivec",
+  "fdct_altivec",
   "idct_add_altivec",
   "idct_put_altivec",
   "put_pixels16_altivec",
@@ -270,6 +272,14 @@ void dsputil_init_ppc(DSPContext* c, AVCodecContext *avctx)
         
 	c->gmc1 = gmc1_altivec;
 
+#ifdef CONFIG_ENCODERS
+	if (avctx->dct_algo == FF_DCT_AUTO ||
+	    avctx->dct_algo == FF_DCT_ALTIVEC)
+	{
+	    c->fdct = fdct_altivec;
+	}
+#endif //CONFIG_ENCODERS
+
         if ((avctx->idct_algo == FF_IDCT_AUTO) ||
                 (avctx->idct_algo == FF_IDCT_ALTIVEC))
         {

libavcodec/ppc/dsputil_ppc.h

@@ -40,6 +40,7 @@ enum powerpc_perf_index {
   altivec_fft_num = 0,
   altivec_gmc1_num,
   altivec_dct_unquantize_h263_num,
+  altivec_fdct,
   altivec_idct_add_num,
   altivec_idct_put_num,
   altivec_put_pixels16_num,