Redesign encode_exponents_blk_ch() so that duplicate exponent sets are no

[ffmpeg] / libavcodec / 4xm.c

diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c
index bf3c07e908d4a79f7440f1aace9f14e8159c1c26..23e8ca44208b29b194c5c9c97b263187ed6adc19 100644 (file)
--- a/libavcodec/4xm.c
+++ b/libavcodec/4xm.c
@@ -20,7 +20,7 @@
  */
 
 /**
- * @file libavcodec/4xm.c
+ * @file
  * 4XM codec.
  */
 
@@ -137,7 +137,7 @@ typedef struct FourXContext{
     int mv[256];
     VLC pre_vlc;
     int last_dc;
-    DECLARE_ALIGNED_16(DCTELEM, block)[6][64];
+    DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
     void *bitstream_buffer;
     unsigned int bitstream_buffer_size;
     int version;
@@ -260,6 +260,23 @@ static void init_mv(FourXContext *f){
     }
 }
 
+#if HAVE_BIGENDIAN
+#define LE_CENTRIC_MUL(dst, src, scale, dc) \
+    { \
+        unsigned tmpval = AV_RN32(src);                 \
+        tmpval = (tmpval <<  16) | (tmpval >>  16);     \
+        tmpval = tmpval * (scale) + (dc);               \
+        tmpval = (tmpval <<  16) | (tmpval >>  16);     \
+        AV_WN32A(dst, tmpval);                          \
+    }
+#else
+#define LE_CENTRIC_MUL(dst, src, scale, dc) \
+    { \
+        unsigned tmpval = AV_RN32(src) * (scale) + (dc); \
+        AV_WN32A(dst, tmpval);                           \
+    }
+#endif
+
 static inline void mcdc(uint16_t *dst, uint16_t *src, int log2w, int h, int stride, int scale, int dc){
    int i;
    dc*= 0x10001;
@@ -274,25 +291,25 @@ static inline void mcdc(uint16_t *dst, uint16_t *src, int log2w, int h, int stri
         break;
     case 1:
         for(i=0; i<h; i++){
-            ((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
+            LE_CENTRIC_MUL(dst, src, scale, dc);
             if(scale) src += stride;
             dst += stride;
         }
         break;
     case 2:
         for(i=0; i<h; i++){
-            ((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
-            ((uint32_t*)dst)[1] = scale*((uint32_t*)src)[1] + dc;
+            LE_CENTRIC_MUL(dst,     src,     scale, dc);
+            LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc);
             if(scale) src += stride;
             dst += stride;
         }
         break;
     case 3:
         for(i=0; i<h; i++){
-            ((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
-            ((uint32_t*)dst)[1] = scale*((uint32_t*)src)[1] + dc;
-            ((uint32_t*)dst)[2] = scale*((uint32_t*)src)[2] + dc;
-            ((uint32_t*)dst)[3] = scale*((uint32_t*)src)[3] + dc;
+            LE_CENTRIC_MUL(dst,     src,     scale, dc);
+            LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc);
+            LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc);
+            LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc);
             if(scale) src += stride;
             dst += stride;
         }
@@ -333,16 +350,16 @@ static void decode_p_block(FourXContext *f, uint16_t *dst, uint16_t *src, int lo
             av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n");
             return;
         }
-        mcdc(dst, src, log2w, h, stride, 1, le2me_16(*f->wordstream++));
+        mcdc(dst, src, log2w, h, stride, 1, av_le2ne16(*f->wordstream++));
     }else if(code == 5){
-        mcdc(dst, src, log2w, h, stride, 0, le2me_16(*f->wordstream++));
+        mcdc(dst, src, log2w, h, stride, 0, av_le2ne16(*f->wordstream++));
     }else if(code == 6){
         if(log2w){
-            dst[0] = le2me_16(*f->wordstream++);
-            dst[1] = le2me_16(*f->wordstream++);
+            dst[0] = av_le2ne16(*f->wordstream++);
+            dst[1] = av_le2ne16(*f->wordstream++);
         }else{
-            dst[0     ] = le2me_16(*f->wordstream++);
-            dst[stride] = le2me_16(*f->wordstream++);
+            dst[0     ] = av_le2ne16(*f->wordstream++);
+            dst[stride] = av_le2ne16(*f->wordstream++);
         }
     }
 }
@@ -842,7 +859,7 @@ static av_cold int decode_end(AVCodecContext *avctx){
 
 AVCodec fourxm_decoder = {
     "4xm",
-    CODEC_TYPE_VIDEO,
+    AVMEDIA_TYPE_VIDEO,
     CODEC_ID_4XM,
     sizeof(FourXContext),
     decode_init,