Make the compilation of h264idct.c optional.

Originally committed as revision 9105 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -26,7 +26,6 @@ OBJS= bitstream.o \
       raw.o \
       faandct.o \
       parser.o \
-      h264idct.o \
       rangecoder.o \
       h263.o \
       opt.o \
@@ -84,7 +83,7 @@ OBJS-$(CONFIG_GIF_ENCODER)             += gif.o
 OBJS-$(CONFIG_H261_DECODER)            += h261dec.o h261.o
 OBJS-$(CONFIG_H261_ENCODER)            += h261enc.o h261.o
 OBJS-$(CONFIG_H263_DECODER)            += h263dec.o
-OBJS-$(CONFIG_H264_DECODER)            += h264.o cabac.o golomb.o
+OBJS-$(CONFIG_H264_DECODER)            += h264.o h264idct.o cabac.o golomb.o
 OBJS-$(CONFIG_H264_ENCODER)            += h264enc.o h264dsp.o
 OBJS-$(CONFIG_HUFFYUV_DECODER)         += huffyuv.o
 OBJS-$(CONFIG_HUFFYUV_ENCODER)         += huffyuv.o

libavcodec/dsputil.c

@@ -3858,7 +3858,7 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
 #endif //CONFIG_ENCODERS
 
     if(avctx->lowres==1){
-        if(avctx->idct_algo==FF_IDCT_INT || avctx->idct_algo==FF_IDCT_AUTO){
+        if(avctx->idct_algo==FF_IDCT_INT || avctx->idct_algo==FF_IDCT_AUTO || !ENABLE_H264_DECODER){
             c->idct_put= ff_jref_idct4_put;
             c->idct_add= ff_jref_idct4_add;
         }else{
@@ -3897,10 +3897,12 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
         }
     }
 
+    if (ENABLE_H264_DECODER) {
     c->h264_idct_add= ff_h264_idct_add_c;
     c->h264_idct8_add= ff_h264_idct8_add_c;
     c->h264_idct_dc_add= ff_h264_idct_dc_add_c;
     c->h264_idct8_dc_add= ff_h264_idct8_dc_add_c;
+    }
 
     c->get_pixels = get_pixels_c;
     c->diff_pixels = diff_pixels_c;