diff --git a/libavcodec/snow.c b/libavcodec/snow.c
index 27c7e25189..384cda82ac 100644
--- a/libavcodec/snow.c
+++ b/libavcodec/snow.c
@@ -99,7 +99,7 @@ static void init_qexp(void){
     double v=128;
 
     for(i=0; i<QROOT; i++){
-        qexp[i]= lrintf(v);
+        ff_qexp[i]= lrintf(v);
         v *= pow(2, 1.0 / QROOT);
     }
 }
@@ -443,7 +443,7 @@ av_cold int ff_snow_common_init(AVCodecContext *avctx){
 
     for(i=0; i<MAX_REF_FRAMES; i++)
         for(j=0; j<MAX_REF_FRAMES; j++)
-            scale_mv_ref[i][j] = 256*(i+1)/(j+1);
+            ff_scale_mv_ref[i][j] = 256*(i+1)/(j+1);
 
     s->avctx->get_buffer(s->avctx, &s->mconly_picture);
     s->scratchbuf = av_malloc(s->mconly_picture.linesize[0]*7*MB_SIZE);
diff --git a/libavcodec/snow.h b/libavcodec/snow.h
index bd54994b5b..5edb8f8af6 100644
--- a/libavcodec/snow.h
+++ b/libavcodec/snow.h
@@ -165,13 +165,9 @@ typedef struct SnowContext{
 }SnowContext;
 
 /* Tables */
-extern const uint8_t * const obmc_tab[4];
-#ifdef __sgi
-// Avoid a name clash on SGI IRIX
-#undef qexp
-#endif
-extern uint8_t qexp[QROOT];
-extern int scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES];
+extern const uint8_t * const ff_obmc_tab[4];
+extern uint8_t ff_qexp[QROOT];
+extern int ff_scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES];
 
 /* C bits used by mmx/sse2/altivec */
 
@@ -256,7 +252,7 @@ static inline void pred_mv(SnowContext *s, int *mx, int *my, int ref,
         *mx = mid_pred(left->mx, top->mx, tr->mx);
         *my = mid_pred(left->my, top->my, tr->my);
     }else{
-        const int *scale = scale_mv_ref[ref];
+        const int *scale = ff_scale_mv_ref[ref];
         *mx = mid_pred((left->mx * scale[left->ref] + 128) >>8,
                        (top ->mx * scale[top ->ref] + 128) >>8,
                        (tr  ->mx * scale[tr  ->ref] + 128) >>8);
@@ -405,7 +401,7 @@ static av_always_inline void predict_slice(SnowContext *s, IDWTELEM *buf, int pl
     int x, y, mb_x;
     int block_size = MB_SIZE >> s->block_max_depth;
     int block_w    = plane_index ? block_size/2 : block_size;
-    const uint8_t *obmc  = plane_index ? obmc_tab[s->block_max_depth+1] : obmc_tab[s->block_max_depth];
+    const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+1] : ff_obmc_tab[s->block_max_depth];
     const int obmc_stride= plane_index ? block_size : 2*block_size;
     int ref_stride= s->current_picture.linesize[plane_index];
     uint8_t *dst8= s->current_picture.data[plane_index];
@@ -496,7 +492,7 @@ static inline void init_ref(MotionEstContext *c, uint8_t *src[3], uint8_t *ref[3
 
 /* bitstream functions */
 
-extern const int8_t quant3bA[256];
+extern const int8_t ff_quant3bA[256];
 
 #define QEXPSHIFT (7-FRAC_BITS+8) //FIXME try to change this to 0
 
@@ -642,7 +638,7 @@ static inline void unpack_coeffs(SnowContext *s, SubBand *b, SubBand * parent, i
                 v=get_rac(&s->c, &b->state[0][context]);
                 if(v){
                     v= 2*(get_symbol2(&s->c, b->state[context + 2], context-4) + 1);
-                    v+=get_rac(&s->c, &b->state[0][16 + 1 + 3 + quant3bA[l&0xFF] + 3*quant3bA[t&0xFF]]);
+                    v+=get_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l&0xFF] + 3*ff_quant3bA[t&0xFF]]);
 
                     xc->x=x;
                     (xc++)->coeff= v;
diff --git a/libavcodec/snowdata.h b/libavcodec/snowdata.h
index ca2468c091..4a91858402 100644
--- a/libavcodec/snowdata.h
+++ b/libavcodec/snowdata.h
@@ -101,7 +101,7 @@ static const uint8_t obmc4[16]={
 //error:0.000000
 };
 
-const int8_t quant3bA[256]={
+const int8_t ff_quant3bA[256]={
  0, 0, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1,
  1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1,
  1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1,
@@ -120,13 +120,13 @@ const int8_t quant3bA[256]={
  1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1, 1,-1,
 };
 
-const uint8_t * const obmc_tab[4]= {
+const uint8_t * const ff_obmc_tab[4]= {
     obmc32, obmc16, obmc8, obmc4
 };
 
 /* runtime generated tables */
-uint8_t qexp[QROOT];
-int scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES];
+uint8_t ff_qexp[QROOT];
+int ff_scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES];
 
 
 #endif /* AVCODEC_SNOW_H */
diff --git a/libavcodec/snowdec.c b/libavcodec/snowdec.c
index 2b6f6e11c7..1dccc638d8 100644
--- a/libavcodec/snowdec.c
+++ b/libavcodec/snowdec.c
@@ -42,7 +42,7 @@ static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer
     int x, y, mb_x;
     int block_size = MB_SIZE >> s->block_max_depth;
     int block_w    = plane_index ? block_size/2 : block_size;
-    const uint8_t *obmc  = plane_index ? obmc_tab[s->block_max_depth+1] : obmc_tab[s->block_max_depth];
+    const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+1] : ff_obmc_tab[s->block_max_depth];
     int obmc_stride= plane_index ? block_size : 2*block_size;
     int ref_stride= s->current_picture.linesize[plane_index];
     uint8_t *dst8= s->current_picture.data[plane_index];
@@ -95,7 +95,7 @@ static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, sli
     const int w= b->width;
     int y;
     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
-    int qmul= qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
+    int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
     int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
     int new_index = 0;
 
@@ -184,7 +184,7 @@ static void decode_q_branch(SnowContext *s, int level, int x, int y){
 static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
     const int w= b->width;
     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
-    const int qmul= qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
+    const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
     const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
     int x,y;
 
diff --git a/libavcodec/snowenc.c b/libavcodec/snowenc.c
index 05b6f0fa86..270af12cb8 100644
--- a/libavcodec/snowenc.c
+++ b/libavcodec/snowenc.c
@@ -575,7 +575,7 @@ static int get_dc(SnowContext *s, int mb_x, int mb_y, int plane_index){
     Plane *p= &s->plane[plane_index];
     const int block_size = MB_SIZE >> s->block_max_depth;
     const int block_w    = plane_index ? block_size/2 : block_size;
-    const uint8_t *obmc  = plane_index ? obmc_tab[s->block_max_depth+1] : obmc_tab[s->block_max_depth];
+    const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+1] : ff_obmc_tab[s->block_max_depth];
     const int obmc_stride= plane_index ? block_size : 2*block_size;
     const int ref_stride= s->current_picture.linesize[plane_index];
     uint8_t *src= s-> input_picture.data[plane_index];
@@ -766,7 +766,7 @@ static int get_4block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index){
     Plane *p= &s->plane[plane_index];
     const int block_size = MB_SIZE >> s->block_max_depth;
     const int block_w    = plane_index ? block_size/2 : block_size;
-    const uint8_t *obmc  = plane_index ? obmc_tab[s->block_max_depth+1] : obmc_tab[s->block_max_depth];
+    const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+1] : ff_obmc_tab[s->block_max_depth];
     const int obmc_stride= plane_index ? block_size : 2*block_size;
     const int ref_stride= s->current_picture.linesize[plane_index];
     uint8_t *dst= s->current_picture.data[plane_index];
@@ -939,7 +939,7 @@ static int encode_subband_c0run(SnowContext *s, SubBand *b, IDWTELEM *src, IDWTE
                     int t2= 2*FFABS(t) + (t<0);
 
                     put_symbol2(&s->c, b->state[context + 2], FFABS(v)-1, context-4);
-                    put_rac(&s->c, &b->state[0][16 + 1 + 3 + quant3bA[l2&0xFF] + 3*quant3bA[t2&0xFF]], v<0);
+                    put_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l2&0xFF] + 3*ff_quant3bA[t2&0xFF]], v<0);
                 }
             }
         }
@@ -1090,7 +1090,7 @@ static void iterative_me(SnowContext *s){
                 //FIXME precalculate
                 {
                     int x, y;
-                    memcpy(obmc_edged, obmc_tab[s->block_max_depth], b_w*b_w*4);
+                    memcpy(obmc_edged, ff_obmc_tab[s->block_max_depth], b_w*b_w*4);
                     if(mb_x==0)
                         for(y=0; y<b_w*2; y++)
                             memset(obmc_edged[y], obmc_edged[y][0] + obmc_edged[y][b_w-1], b_w);
@@ -1286,7 +1286,7 @@ static void quantize(SnowContext *s, SubBand *b, IDWTELEM *dst, DWTELEM *src, in
     const int w= b->width;
     const int h= b->height;
     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
-    const int qmul= qexp[qlog&(QROOT-1)]<<((qlog>>QSHIFT) + ENCODER_EXTRA_BITS);
+    const int qmul= ff_qexp[qlog&(QROOT-1)]<<((qlog>>QSHIFT) + ENCODER_EXTRA_BITS);
     int x,y, thres1, thres2;
 
     if(s->qlog == LOSSLESS_QLOG){
@@ -1347,7 +1347,7 @@ static void dequantize(SnowContext *s, SubBand *b, IDWTELEM *src, int stride){
     const int w= b->width;
     const int h= b->height;
     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
-    const int qmul= qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
+    const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
     const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
     int x,y;
 
@@ -1538,7 +1538,7 @@ static int ratecontrol_1pass(SnowContext *s, AVFrame *pict)
             const int h= b->height;
             const int stride= b->stride;
             const int qlog= av_clip(2*QROOT + b->qlog, 0, QROOT*16);
-            const int qmul= qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
+            const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
             const int qdiv= (1<<16)/qmul;
             int x, y;
             //FIXME this is ugly