avcodec/vp8dsp: Constify src in vp8_mc_func

Reviewed-by: Peter Ross <pross@xvid.org>
Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

12 files changed, 206 insertions, 205 deletions

diff --git a/libavcodec/aarch64/vp8dsp.h b/libavcodec/aarch64/vp8dsp.h
index 871fed7a95..4e59de28b1 100644
--- a/libavcodec/aarch64/vp8dsp.h
+++ b/libavcodec/aarch64/vp8dsp.h
@@ -53,7 +53,7 @@
 
 #define VP8_MC(n, opt)                                                  \
     void ff_put_vp8_##n##_##opt(uint8_t *dst, ptrdiff_t dststride,      \
-                                uint8_t *src, ptrdiff_t srcstride,      \
+                                const uint8_t *src, ptrdiff_t srcstride,\
                                 int h, int x, int y)
 
 #define VP8_EPEL(w, opt)                        \
diff --git a/libavcodec/arm/vp8dsp.h b/libavcodec/arm/vp8dsp.h
index 7281d0bfb1..11dcc78d7a 100644
--- a/libavcodec/arm/vp8dsp.h
+++ b/libavcodec/arm/vp8dsp.h
@@ -58,7 +58,7 @@ void ff_vp8dsp_init_neon(VP8DSPContext *dsp);
 
 #define VP8_MC(n, opt)                                                  \
     void ff_put_vp8_##n##_##opt(uint8_t *dst, ptrdiff_t dststride,      \
-                                uint8_t *src, ptrdiff_t srcstride,      \
+                                const uint8_t *src, ptrdiff_t srcstride,\
                                 int h, int x, int y)
 
 #define VP8_EPEL(w, opt)                        \
diff --git a/libavcodec/arm/vp8dsp_armv6.S b/libavcodec/arm/vp8dsp_armv6.S
index 2320bf4d23..395debe866 100644
--- a/libavcodec/arm/vp8dsp_armv6.S
+++ b/libavcodec/arm/vp8dsp_armv6.S
@@ -1113,7 +1113,7 @@ endfunc
 
 @ MC
 
-@ void put_vp8_pixels16(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+@ void put_vp8_pixels16(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
 @                       ptrdiff_t srcstride, int h, int mx, int my)
 function ff_put_vp8_pixels16_armv6, export=1
         push            {r4-r11}
@@ -1137,7 +1137,7 @@ function ff_put_vp8_pixels16_armv6, export=1
         bx              lr
 endfunc
 
-@ void put_vp8_pixels8(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+@ void put_vp8_pixels8(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
 @                      ptrdiff_t srcstride, int h, int mx, int my)
 function ff_put_vp8_pixels8_armv6, export=1
         push            {r4-r11}
@@ -1161,7 +1161,7 @@ function ff_put_vp8_pixels8_armv6, export=1
         bx              lr
 endfunc
 
-@ void put_vp8_pixels4(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+@ void put_vp8_pixels4(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
 @                      ptrdiff_t srcstride, int h, int mx, int my)
 function ff_put_vp8_pixels4_armv6, export=1
         ldr             r12, [sp, #0]           @ h
diff --git a/libavcodec/loongarch/vp8_mc_lsx.c b/libavcodec/loongarch/vp8_mc_lsx.c
index 80c4f87e80..034d84cc5d 100644
--- a/libavcodec/loongarch/vp8_mc_lsx.c
+++ b/libavcodec/loongarch/vp8_mc_lsx.c
@@ -122,7 +122,7 @@ static const int8_t subpel_filters_lsx[7][8] = {
 } )
 
 void ff_put_vp8_epel8_h6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -187,7 +187,7 @@ void ff_put_vp8_epel8_h6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -241,7 +241,7 @@ void ff_put_vp8_epel16_h6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -308,7 +308,7 @@ void ff_put_vp8_epel8_v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -389,7 +389,7 @@ void ff_put_vp8_epel16_v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h6v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -491,7 +491,7 @@ void ff_put_vp8_epel8_h6v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h6v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     int32_t multiple8_cnt;
@@ -504,7 +504,7 @@ void ff_put_vp8_epel16_h6v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -561,7 +561,7 @@ void ff_put_vp8_epel8_v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -631,7 +631,7 @@ void ff_put_vp8_epel16_v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h6v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -714,7 +714,7 @@ void ff_put_vp8_epel8_h6v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h6v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     int32_t multiple8_cnt;
@@ -728,7 +728,7 @@ void ff_put_vp8_epel16_h6v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h4v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -818,7 +818,7 @@ void ff_put_vp8_epel8_h4v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h4v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     int32_t multiple8_cnt;
@@ -832,7 +832,7 @@ void ff_put_vp8_epel16_h4v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_pixels8_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                            uint8_t *src, ptrdiff_t src_stride,
+                            const uint8_t *src, ptrdiff_t src_stride,
                             int height, int mx, int my)
 {
     int32_t cnt;
@@ -889,12 +889,13 @@ void ff_put_vp8_pixels8_lsx(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_pixels16_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     int32_t width = 16;
     int32_t cnt, loop_cnt;
-    uint8_t *src_tmp, *dst_tmp;
+    const uint8_t *src_tmp;
+    uint8_t *dst_tmp;
     __m128i src0, src1, src2, src3, src4, src5, src6, src7;
 
     ptrdiff_t src_stride2 = src_stride << 1;
diff --git a/libavcodec/loongarch/vp8dsp_loongarch.h b/libavcodec/loongarch/vp8dsp_loongarch.h
index 87e9509db9..09c7e1f91d 100644
--- a/libavcodec/loongarch/vp8dsp_loongarch.h
+++ b/libavcodec/loongarch/vp8dsp_loongarch.h
@@ -25,49 +25,49 @@
 #include "libavcodec/vp8dsp.h"
 
 void ff_put_vp8_pixels8_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                            uint8_t *src, ptrdiff_t src_stride,
+                            const uint8_t *src, ptrdiff_t src_stride,
                             int h, int x, int y);
 void ff_put_vp8_pixels16_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int h, int x, int y);
 
 void ff_put_vp8_epel16_h6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int h, int mx, int my);
 void ff_put_vp8_epel16_v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int h, int mx, int my);
 void ff_put_vp8_epel16_v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int h, int mx, int my);
 void ff_put_vp8_epel16_h6v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int h, int mx, int my);
 void ff_put_vp8_epel16_h4v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int h, int mx, int my);
 void ff_put_vp8_epel16_h6v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int h, int mx, int my);
 
 void ff_put_vp8_epel8_v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int h, int mx, int my);
 void ff_put_vp8_epel8_v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int h, int mx, int my);
 void ff_put_vp8_epel8_h6v4_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int h, int mx, int my);
 void ff_put_vp8_epel8_h4v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int h, int mx, int my);
 void ff_put_vp8_epel8_h6v6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int h, int mx, int my);
 
 void ff_put_vp8_epel8_h6_lsx(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int h, int mx, int my);
 
 /* loop filter */
diff --git a/libavcodec/mips/vp8_mc_msa.c b/libavcodec/mips/vp8_mc_msa.c
index a61320625a..be1997f7dd 100644
--- a/libavcodec/mips/vp8_mc_msa.c
+++ b/libavcodec/mips/vp8_mc_msa.c
@@ -156,7 +156,7 @@ static const int8_t bilinear_filters_msa[7][2] = {
                  out0, out1, out2, out3);                                     \
 }
 
-static void common_hz_6t_4x4_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_6t_4x4_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -184,7 +184,7 @@ static void common_hz_6t_4x4_msa(uint8_t *src, int32_t src_stride,
     ST_W4(out, 0, 1, 2, 3, dst, dst_stride);
 }
 
-static void common_hz_6t_4x8_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_6t_4x8_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -220,7 +220,7 @@ static void common_hz_6t_4x8_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_epel4_h6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     const int8_t *filter = subpel_filters_msa[mx - 1];
@@ -233,7 +233,7 @@ void ff_put_vp8_epel4_h6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -281,7 +281,7 @@ void ff_put_vp8_epel8_h6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -330,7 +330,7 @@ void ff_put_vp8_epel16_h6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel4_v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -377,7 +377,7 @@ void ff_put_vp8_epel4_v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -427,7 +427,7 @@ void ff_put_vp8_epel8_v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -501,7 +501,7 @@ void ff_put_vp8_epel16_v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel4_h6v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -576,7 +576,7 @@ void ff_put_vp8_epel4_h6v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h6v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -663,7 +663,7 @@ void ff_put_vp8_epel8_h6v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 
 
 void ff_put_vp8_epel16_h6v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     int32_t multiple8_cnt;
@@ -677,7 +677,7 @@ void ff_put_vp8_epel16_h6v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
     }
 }
 
-static void common_hz_4t_4x4_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_4t_4x4_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -704,7 +704,7 @@ static void common_hz_4t_4x4_msa(uint8_t *src, int32_t src_stride,
     ST_W4(out, 0, 1, 2, 3, dst, dst_stride);
 }
 
-static void common_hz_4t_4x8_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_4t_4x8_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -739,7 +739,7 @@ static void common_hz_4t_4x8_msa(uint8_t *src, int32_t src_stride,
     ST_W4(out, 0, 1, 2, 3, dst + 4 * dst_stride, dst_stride);
 }
 
-static void common_hz_4t_4x16_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_4t_4x16_msa(const uint8_t *src, int32_t src_stride,
                                   uint8_t *dst, int32_t dst_stride,
                                   const int8_t *filter)
 {
@@ -790,7 +790,7 @@ static void common_hz_4t_4x16_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_epel4_h4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     const int8_t *filter = subpel_filters_msa[mx - 1];
@@ -805,7 +805,7 @@ void ff_put_vp8_epel4_h4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -840,7 +840,7 @@ void ff_put_vp8_epel8_h4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -889,7 +889,7 @@ void ff_put_vp8_epel16_h4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel4_v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -936,7 +936,7 @@ void ff_put_vp8_epel4_v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                             uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                              int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -982,7 +982,7 @@ void ff_put_vp8_epel8_v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                              uint8_t *src, ptrdiff_t src_stride,
+                              const uint8_t *src, ptrdiff_t src_stride,
                               int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1041,7 +1041,7 @@ void ff_put_vp8_epel16_v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel4_h4v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1100,7 +1100,7 @@ void ff_put_vp8_epel4_h4v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h4v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1167,7 +1167,7 @@ void ff_put_vp8_epel8_h4v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h4v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     int32_t multiple8_cnt;
@@ -1182,7 +1182,7 @@ void ff_put_vp8_epel16_h4v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel4_h6v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1248,7 +1248,7 @@ void ff_put_vp8_epel4_h6v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h6v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1321,7 +1321,7 @@ void ff_put_vp8_epel8_h6v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h6v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     int32_t multiple8_cnt;
@@ -1336,7 +1336,7 @@ void ff_put_vp8_epel16_h6v4_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel4_h4v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1400,7 +1400,7 @@ void ff_put_vp8_epel4_h4v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel8_h4v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                               uint8_t *src, ptrdiff_t src_stride,
+                               const uint8_t *src, ptrdiff_t src_stride,
                                int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1475,7 +1475,7 @@ void ff_put_vp8_epel8_h4v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_epel16_h4v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     int32_t multiple8_cnt;
@@ -1489,7 +1489,7 @@ void ff_put_vp8_epel16_h4v6_msa(uint8_t *dst, ptrdiff_t dst_stride,
     }
 }
 
-static void common_hz_2t_4x4_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_2t_4x4_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -1512,7 +1512,7 @@ static void common_hz_2t_4x4_msa(uint8_t *src, int32_t src_stride,
     ST_W2(res1, 0, 1, dst + 2 * dst_stride, dst_stride);
 }
 
-static void common_hz_2t_4x8_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_2t_4x8_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -1542,7 +1542,7 @@ static void common_hz_2t_4x8_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_bilinear4_h_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     const int8_t *filter = bilinear_filters_msa[mx - 1];
@@ -1554,7 +1554,7 @@ void ff_put_vp8_bilinear4_h_msa(uint8_t *dst, ptrdiff_t dst_stride,
     }
 }
 
-static void common_hz_2t_8x4_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_2t_8x4_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -1578,7 +1578,7 @@ static void common_hz_2t_8x4_msa(uint8_t *src, int32_t src_stride,
     ST_D4(src0, src1, 0, 1, 0, 1, dst, dst_stride);
 }
 
-static void common_hz_2t_8x8mult_msa(uint8_t *src, int32_t src_stride,
+static void common_hz_2t_8x8mult_msa(const uint8_t *src, int32_t src_stride,
                                      uint8_t *dst, int32_t dst_stride,
                                      const int8_t *filter, int32_t height)
 {
@@ -1642,7 +1642,7 @@ static void common_hz_2t_8x8mult_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_bilinear8_h_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     const int8_t *filter = bilinear_filters_msa[mx - 1];
@@ -1656,7 +1656,7 @@ void ff_put_vp8_bilinear8_h_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_bilinear16_h_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                 uint8_t *src, ptrdiff_t src_stride,
+                                 const uint8_t *src, ptrdiff_t src_stride,
                                  int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1722,7 +1722,7 @@ void ff_put_vp8_bilinear16_h_msa(uint8_t *dst, ptrdiff_t dst_stride,
     }
 }
 
-static void common_vt_2t_4x4_msa(uint8_t *src, int32_t src_stride,
+static void common_vt_2t_4x4_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -1748,7 +1748,7 @@ static void common_vt_2t_4x4_msa(uint8_t *src, int32_t src_stride,
     ST_W4(src2110, 0, 1, 2, 3, dst, dst_stride);
 }
 
-static void common_vt_2t_4x8_msa(uint8_t *src, int32_t src_stride,
+static void common_vt_2t_4x8_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -1783,7 +1783,7 @@ static void common_vt_2t_4x8_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_bilinear4_v_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     const int8_t *filter = bilinear_filters_msa[my - 1];
@@ -1795,7 +1795,7 @@ void ff_put_vp8_bilinear4_v_msa(uint8_t *dst, ptrdiff_t dst_stride,
     }
 }
 
-static void common_vt_2t_8x4_msa(uint8_t *src, int32_t src_stride,
+static void common_vt_2t_8x4_msa(const uint8_t *src, int32_t src_stride,
                                  uint8_t *dst, int32_t dst_stride,
                                  const int8_t *filter)
 {
@@ -1819,7 +1819,7 @@ static void common_vt_2t_8x4_msa(uint8_t *src, int32_t src_stride,
     ST_D4(out0, out1, 0, 1, 0, 1, dst, dst_stride);
 }
 
-static void common_vt_2t_8x8mult_msa(uint8_t *src, int32_t src_stride,
+static void common_vt_2t_8x8mult_msa(const uint8_t *src, int32_t src_stride,
                                      uint8_t *dst, int32_t dst_stride,
                                      const int8_t *filter, int32_t height)
 {
@@ -1865,7 +1865,7 @@ static void common_vt_2t_8x8mult_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_bilinear8_v_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                uint8_t *src, ptrdiff_t src_stride,
+                                const uint8_t *src, ptrdiff_t src_stride,
                                 int height, int mx, int my)
 {
     const int8_t *filter = bilinear_filters_msa[my - 1];
@@ -1879,7 +1879,7 @@ void ff_put_vp8_bilinear8_v_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_bilinear16_v_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                 uint8_t *src, ptrdiff_t src_stride,
+                                 const uint8_t *src, ptrdiff_t src_stride,
                                  int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -1932,7 +1932,7 @@ void ff_put_vp8_bilinear16_v_msa(uint8_t *dst, ptrdiff_t dst_stride,
     }
 }
 
-static void common_hv_2ht_2vt_4x4_msa(uint8_t *src, int32_t src_stride,
+static void common_hv_2ht_2vt_4x4_msa(const uint8_t *src, int32_t src_stride,
                                       uint8_t *dst, int32_t dst_stride,
                                       const int8_t *filter_horiz,
                                       const int8_t *filter_vert)
@@ -1966,7 +1966,7 @@ static void common_hv_2ht_2vt_4x4_msa(uint8_t *src, int32_t src_stride,
     ST_W2(res1, 0, 1, dst + 2 * dst_stride, dst_stride);
 }
 
-static void common_hv_2ht_2vt_4x8_msa(uint8_t *src, int32_t src_stride,
+static void common_hv_2ht_2vt_4x8_msa(const uint8_t *src, int32_t src_stride,
                                       uint8_t *dst, int32_t dst_stride,
                                       const int8_t *filter_horiz,
                                       const int8_t *filter_vert)
@@ -2014,7 +2014,7 @@ static void common_hv_2ht_2vt_4x8_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_bilinear4_hv_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                 uint8_t *src, ptrdiff_t src_stride,
+                                 const uint8_t *src, ptrdiff_t src_stride,
                                  int height, int mx, int my)
 {
     const int8_t *filter_horiz = bilinear_filters_msa[mx - 1];
@@ -2029,7 +2029,7 @@ void ff_put_vp8_bilinear4_hv_msa(uint8_t *dst, ptrdiff_t dst_stride,
     }
 }
 
-static void common_hv_2ht_2vt_8x4_msa(uint8_t *src, int32_t src_stride,
+static void common_hv_2ht_2vt_8x4_msa(const uint8_t *src, int32_t src_stride,
                                       uint8_t *dst, int32_t dst_stride,
                                       const int8_t *filter_horiz,
                                       const int8_t *filter_vert)
@@ -2073,7 +2073,7 @@ static void common_hv_2ht_2vt_8x4_msa(uint8_t *src, int32_t src_stride,
     ST_D4(out0, out1, 0, 1, 0, 1, dst, dst_stride);
 }
 
-static void common_hv_2ht_2vt_8x8mult_msa(uint8_t *src, int32_t src_stride,
+static void common_hv_2ht_2vt_8x8mult_msa(const uint8_t *src, int32_t src_stride,
                                           uint8_t *dst, int32_t dst_stride,
                                           const int8_t *filter_horiz,
                                           const int8_t *filter_vert,
@@ -2154,7 +2154,7 @@ static void common_hv_2ht_2vt_8x8mult_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_bilinear8_hv_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                 uint8_t *src, ptrdiff_t src_stride,
+                                 const uint8_t *src, ptrdiff_t src_stride,
                                  int height, int mx, int my)
 {
     const int8_t *filter_horiz = bilinear_filters_msa[mx - 1];
@@ -2170,7 +2170,7 @@ void ff_put_vp8_bilinear8_hv_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_bilinear16_hv_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                                  uint8_t *src, ptrdiff_t src_stride,
+                                  const uint8_t *src, ptrdiff_t src_stride,
                                   int height, int mx, int my)
 {
     uint32_t loop_cnt;
@@ -2241,7 +2241,7 @@ void ff_put_vp8_bilinear16_hv_msa(uint8_t *dst, ptrdiff_t dst_stride,
 }
 
 void ff_put_vp8_pixels8_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                            uint8_t *src, ptrdiff_t src_stride,
+                            const uint8_t *src, ptrdiff_t src_stride,
                             int height, int mx, int my)
 {
     int32_t cnt;
@@ -2283,16 +2283,16 @@ void ff_put_vp8_pixels8_msa(uint8_t *dst, ptrdiff_t dst_stride,
     }
 }
 
-static void copy_16multx8mult_msa(uint8_t *src, int32_t src_stride,
+static void copy_16multx8mult_msa(const uint8_t *src, int32_t src_stride,
                                   uint8_t *dst, int32_t dst_stride,
                                   int32_t height, int32_t width)
 {
     int32_t cnt, loop_cnt;
-    uint8_t *src_tmp, *dst_tmp;
+    uint8_t *dst_tmp;
     v16u8 src0, src1, src2, src3, src4, src5, src6, src7;
 
     for (cnt = (width >> 4); cnt--;) {
-        src_tmp = src;
+        const uint8_t *src_tmp = src;
         dst_tmp = dst;
 
         for (loop_cnt = (height >> 3); loop_cnt--;) {
@@ -2311,7 +2311,7 @@ static void copy_16multx8mult_msa(uint8_t *src, int32_t src_stride,
 }
 
 void ff_put_vp8_pixels16_msa(uint8_t *dst, ptrdiff_t dst_stride,
-                            uint8_t *src, ptrdiff_t src_stride,
+                             const uint8_t *src, ptrdiff_t src_stride,
                             int height, int mx, int my)
 {
     int32_t cnt;
diff --git a/libavcodec/mips/vp8dsp_mips.h b/libavcodec/mips/vp8dsp_mips.h
index 07666ab7a0..3d88db897a 100644
--- a/libavcodec/mips/vp8dsp_mips.h
+++ b/libavcodec/mips/vp8dsp_mips.h
@@ -28,118 +28,118 @@
 #include "constants.h"
 
 void ff_put_vp8_pixels4_msa(uint8_t *dst, ptrdiff_t dststride,
-                            uint8_t *src, ptrdiff_t srcstride,
+                            const uint8_t *src, ptrdiff_t srcstride,
                             int h, int x, int y);
 void ff_put_vp8_pixels8_msa(uint8_t *dst, ptrdiff_t dststride,
-                            uint8_t *src, ptrdiff_t srcstride,
+                            const uint8_t *src, ptrdiff_t srcstride,
                             int h, int x, int y);
 void ff_put_vp8_pixels16_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int x, int y);
 
 void ff_put_vp8_epel16_h4_msa(uint8_t *dst, ptrdiff_t dststride,
-                              uint8_t *src, ptrdiff_t srcstride,
+                              const uint8_t *src, ptrdiff_t srcstride,
                               int h, int mx, int my);
 void ff_put_vp8_epel16_h6_msa(uint8_t *dst, ptrdiff_t dststride,
-                              uint8_t *src, ptrdiff_t srcstride,
+                              const uint8_t *src, ptrdiff_t srcstride,
                               int h, int mx, int my);
 void ff_put_vp8_epel16_v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                              uint8_t *src, ptrdiff_t srcstride,
+                              const uint8_t *src, ptrdiff_t srcstride,
                               int h, int mx, int my);
 void ff_put_vp8_epel16_v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                              uint8_t *src, ptrdiff_t srcstride,
+                              const uint8_t *src, ptrdiff_t srcstride,
                               int h, int mx, int my);
 void ff_put_vp8_epel16_h4v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int h, int mx, int my);
 void ff_put_vp8_epel16_h6v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int h, int mx, int my);
 void ff_put_vp8_epel16_h4v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int h, int mx, int my);
 void ff_put_vp8_epel16_h6v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int h, int mx, int my);
 
 void ff_put_vp8_epel8_h4_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int mx, int my);
 void ff_put_vp8_epel8_h6_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int mx, int my);
 void ff_put_vp8_epel8_v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int mx, int my);
 void ff_put_vp8_epel8_v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int mx, int my);
 void ff_put_vp8_epel8_h4v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                               uint8_t *src, ptrdiff_t srcstride,
+                               const uint8_t *src, ptrdiff_t srcstride,
                                int h, int mx, int my);
 void ff_put_vp8_epel8_h6v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                               uint8_t *src, ptrdiff_t srcstride,
+                               const uint8_t *src, ptrdiff_t srcstride,
                                int h, int mx, int my);
 void ff_put_vp8_epel8_h4v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                               uint8_t *src, ptrdiff_t srcstride,
+                               const uint8_t *src, ptrdiff_t srcstride,
                                int h, int mx, int my);
 void ff_put_vp8_epel8_h6v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                               uint8_t *src, ptrdiff_t srcstride,
+                               const uint8_t *src, ptrdiff_t srcstride,
                                int h, int mx, int my);
 
 void ff_put_vp8_epel4_h4_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int mx, int my);
 void ff_put_vp8_epel4_h6_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int mx, int my);
 void ff_put_vp8_epel4_v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int mx, int my);
 void ff_put_vp8_epel4_v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int h, int mx, int my);
 void ff_put_vp8_epel4_h4v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                               uint8_t *src, ptrdiff_t srcstride,
+                               const uint8_t *src, ptrdiff_t srcstride,
                                int h, int mx, int my);
 void ff_put_vp8_epel4_h6v4_msa(uint8_t *dst, ptrdiff_t dststride,
-                               uint8_t *src, ptrdiff_t srcstride,
+                               const uint8_t *src, ptrdiff_t srcstride,
                                int h, int mx, int my);
 void ff_put_vp8_epel4_h4v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                               uint8_t *src, ptrdiff_t srcstride,
+                               const uint8_t *src, ptrdiff_t srcstride,
                                int h, int mx, int my);
 void ff_put_vp8_epel4_h6v6_msa(uint8_t *dst, ptrdiff_t dststride,
-                               uint8_t *src, ptrdiff_t srcstride,
+                               const uint8_t *src, ptrdiff_t srcstride,
                                int h, int mx, int my);
 
 void ff_put_vp8_bilinear16_h_msa(uint8_t *dst, ptrdiff_t dststride,
-                                 uint8_t *src, ptrdiff_t srcstride,
+                                 const uint8_t *src, ptrdiff_t srcstride,
                                  int h, int mx, int my);
 void ff_put_vp8_bilinear16_v_msa(uint8_t *dst, ptrdiff_t dststride,
-                                 uint8_t *src, ptrdiff_t srcstride,
+                                 const uint8_t *src, ptrdiff_t srcstride,
                                  int h, int mx, int my);
 void ff_put_vp8_bilinear16_hv_msa(uint8_t *dst, ptrdiff_t dststride,
-                                  uint8_t *src, ptrdiff_t srcstride,
+                                  const uint8_t *src, ptrdiff_t srcstride,
                                   int h, int mx, int my);
 
 void ff_put_vp8_bilinear8_h_msa(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int h, int mx, int my);
 void ff_put_vp8_bilinear8_v_msa(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int h, int mx, int my);
 void ff_put_vp8_bilinear8_hv_msa(uint8_t *dst, ptrdiff_t dststride,
-                                 uint8_t *src, ptrdiff_t srcstride,
+                                 const uint8_t *src, ptrdiff_t srcstride,
                                  int h, int mx, int my);
 
 void ff_put_vp8_bilinear4_h_msa(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int h, int mx, int my);
 void ff_put_vp8_bilinear4_v_msa(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int h, int mx, int my);
 void ff_put_vp8_bilinear4_hv_msa(uint8_t *dst, ptrdiff_t dststride,
-                                 uint8_t *src, ptrdiff_t srcstride,
+                                 const uint8_t *src, ptrdiff_t srcstride,
                                  int h, int mx, int my);
 
 /* loop filter */
@@ -184,84 +184,84 @@ void ff_vp8_idct_dc_add4y_mmi(uint8_t *dst, int16_t block[4][16],
 void ff_vp8_idct_dc_add4uv_mmi(uint8_t *dst, int16_t block[4][16],
         ptrdiff_t stride);
 
-void ff_put_vp8_pixels4_mmi(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+void ff_put_vp8_pixels4_mmi(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
         ptrdiff_t srcstride, int h, int x, int y);
-void ff_put_vp8_pixels8_mmi(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+void ff_put_vp8_pixels8_mmi(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
         ptrdiff_t srcstride, int h, int x, int y);
-void ff_put_vp8_pixels16_mmi(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+void ff_put_vp8_pixels16_mmi(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
         ptrdiff_t srcstride, int h, int x, int y);
 
-void ff_put_vp8_epel16_h4_mmi(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+void ff_put_vp8_epel16_h4_mmi(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
         ptrdiff_t srcstride, int h, int mx, int my);
-void ff_put_vp8_epel16_h6_mmi(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+void ff_put_vp8_epel16_h6_mmi(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
         ptrdiff_t srcstride, int h, int mx, int my);
-void ff_put_vp8_epel16_v4_mmi(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+void ff_put_vp8_epel16_v4_mmi(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
         ptrdiff_t srcstride, int h, int mx, int my);
-void ff_put_vp8_epel16_v6_mmi(uint8_t *dst, ptrdiff_t dststride, uint8_t *src,
+void ff_put_vp8_epel16_v6_mmi(uint8_t *dst, ptrdiff_t dststride, const uint8_t *src,
         ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel16_h4v4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel16_h6v4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel16_h4v6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel16_h6v6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 
 void ff_put_vp8_epel8_h4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel8_h6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel8_v4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel8_v6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel8_h4v4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel8_h6v4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel8_h4v6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel8_h6v6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 
 void ff_put_vp8_epel4_h4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel4_h6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel4_v4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel4_v6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel4_h4v4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel4_h6v4_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel4_h4v6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_epel4_h6v6_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 
 void ff_put_vp8_bilinear16_h_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_bilinear16_v_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_bilinear16_hv_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 
 void ff_put_vp8_bilinear8_h_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_bilinear8_v_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_bilinear8_hv_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 
 void ff_put_vp8_bilinear4_h_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_bilinear4_v_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 void ff_put_vp8_bilinear4_hv_mmi(uint8_t *dst, ptrdiff_t dststride,
-        uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
+        const uint8_t *src, ptrdiff_t srcstride, int h, int mx, int my);
 
 // loop filter applied to edges between macroblocks
 void ff_vp8_v_loop_filter16_mmi(uint8_t *dst, ptrdiff_t stride, int flim_E,
diff --git a/libavcodec/ppc/vp8dsp_altivec.c b/libavcodec/ppc/vp8dsp_altivec.c
index 273de84778..12dac8b0a8 100644
--- a/libavcodec/ppc/vp8dsp_altivec.c
+++ b/libavcodec/ppc/vp8dsp_altivec.c
@@ -96,7 +96,7 @@ static const vec_s8 h_subpel_filters_outer[3] =
 
 static av_always_inline
 void put_vp8_epel_h_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
-                                 uint8_t *src, ptrdiff_t src_stride,
+                                 const uint8_t *src, ptrdiff_t src_stride,
                                  int h, int mx, int w, int is6tap)
 {
     LOAD_H_SUBPEL_FILTER(mx-1);
@@ -193,7 +193,7 @@ static const vec_u8 v_subpel_filters[7] =
 
 static av_always_inline
 void put_vp8_epel_v_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
-                                 uint8_t *src, ptrdiff_t src_stride,
+                                 const uint8_t *src, ptrdiff_t src_stride,
                                  int h, int my, int w, int is6tap)
 {
     LOAD_V_SUBPEL_FILTER(my-1);
@@ -259,19 +259,19 @@ void put_vp8_epel_v_altivec_core(uint8_t *dst, ptrdiff_t dst_stride,
 
 #define EPEL_FUNCS(WIDTH, TAPS) \
 static av_noinline \
-void put_vp8_epel ## WIDTH ## _h ## TAPS ## _altivec(uint8_t *dst, ptrdiff_t dst_stride, uint8_t *src, ptrdiff_t src_stride, int h, int mx, int my) \
+void put_vp8_epel ## WIDTH ## _h ## TAPS ## _altivec(uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src, ptrdiff_t src_stride, int h, int mx, int my) \
 { \
     put_vp8_epel_h_altivec_core(dst, dst_stride, src, src_stride, h, mx, WIDTH, TAPS == 6); \
 } \
 \
 static av_noinline \
-void put_vp8_epel ## WIDTH ## _v ## TAPS ## _altivec(uint8_t *dst, ptrdiff_t dst_stride, uint8_t *src, ptrdiff_t src_stride, int h, int mx, int my) \
+void put_vp8_epel ## WIDTH ## _v ## TAPS ## _altivec(uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src, ptrdiff_t src_stride, int h, int mx, int my) \
 { \
     put_vp8_epel_v_altivec_core(dst, dst_stride, src, src_stride, h, my, WIDTH, TAPS == 6); \
 }
 
 #define EPEL_HV(WIDTH, HTAPS, VTAPS) \
-static void put_vp8_epel ## WIDTH ## _h ## HTAPS ## v ## VTAPS ## _altivec(uint8_t *dst, ptrdiff_t dstride, uint8_t *src, ptrdiff_t sstride, int h, int mx, int my) \
+static void put_vp8_epel ## WIDTH ## _h ## HTAPS ## v ## VTAPS ## _altivec(uint8_t *dst, ptrdiff_t dstride, const uint8_t *src, ptrdiff_t sstride, int h, int mx, int my) \
 { \
     DECLARE_ALIGNED(16, uint8_t, tmp)[(2*WIDTH+5)*16]; \
     if (VTAPS == 6) { \
@@ -299,7 +299,7 @@ EPEL_HV(4,  4,6)
 EPEL_HV(4,  6,4)
 EPEL_HV(4,  4,4)
 
-static void put_vp8_pixels16_altivec(uint8_t *dst, ptrdiff_t dstride, uint8_t *src, ptrdiff_t sstride, int h, int mx, int my)
+static void put_vp8_pixels16_altivec(uint8_t *dst, ptrdiff_t dstride, const uint8_t *src, ptrdiff_t sstride, int h, int mx, int my)
 {
     register vector unsigned char perm;
     int i;
diff --git a/libavcodec/vp8dsp.c b/libavcodec/vp8dsp.c
index a92774ed5e..7a85e9f4ca 100644
--- a/libavcodec/vp8dsp.c
+++ b/libavcodec/vp8dsp.c
@@ -468,7 +468,7 @@ static const uint8_t subpel_filters[7][6] = {
 
 #define PUT_PIXELS(WIDTH)                                                     \
 static void put_vp8_pixels ## WIDTH ## _c(uint8_t *dst, ptrdiff_t dststride,  \
-                                          uint8_t *src, ptrdiff_t srcstride,  \
+                                          const uint8_t *src, ptrdiff_t srcstride, \
                                           int h, int x, int y)                \
 {                                                                             \
     int i;                                                                    \
@@ -492,7 +492,7 @@ PUT_PIXELS(4)
 #define VP8_EPEL_H(SIZE, TAPS)                                                \
 static void put_vp8_epel ## SIZE ## _h ## TAPS ## _c(uint8_t *dst,            \
                                                      ptrdiff_t dststride,     \
-                                                     uint8_t *src,            \
+                                                     const uint8_t *src,      \
                                                      ptrdiff_t srcstride,     \
                                                      int h, int mx, int my)   \
 {                                                                             \
@@ -510,7 +510,7 @@ static void put_vp8_epel ## SIZE ## _h ## TAPS ## _c(uint8_t *dst,            \
 #define VP8_EPEL_V(SIZE, TAPS)                                                \
 static void put_vp8_epel ## SIZE ## _v ## TAPS ## _c(uint8_t *dst,            \
                                                      ptrdiff_t dststride,     \
-                                                     uint8_t *src,            \
+                                                     const uint8_t *src,      \
                                                      ptrdiff_t srcstride,     \
                                                      int h, int mx, int my)   \
 {                                                                             \
@@ -529,7 +529,7 @@ static void put_vp8_epel ## SIZE ## _v ## TAPS ## _c(uint8_t *dst,            \
 static void                                                                   \
 put_vp8_epel ## SIZE ## _h ## HTAPS ## v ## VTAPS ## _c(uint8_t *dst,         \
                                                         ptrdiff_t dststride,  \
-                                                        uint8_t *src,         \
+                                                        const uint8_t *src,   \
                                                         ptrdiff_t srcstride,  \
                                                         int h, int mx,        \
                                                         int my)               \
@@ -586,7 +586,7 @@ VP8_EPEL_HV(4,  6, 6)
 
 #define VP8_BILINEAR(SIZE)                                                    \
 static void put_vp8_bilinear ## SIZE ## _h_c(uint8_t *dst, ptrdiff_t dstride, \
-                                             uint8_t *src, ptrdiff_t sstride, \
+                                             const uint8_t *src, ptrdiff_t sstride, \
                                              int h, int mx, int my)           \
 {                                                                             \
     int a = 8 - mx, b = mx;                                                   \
@@ -600,7 +600,7 @@ static void put_vp8_bilinear ## SIZE ## _h_c(uint8_t *dst, ptrdiff_t dstride, \
 }                                                                             \
                                                                               \
 static void put_vp8_bilinear ## SIZE ## _v_c(uint8_t *dst, ptrdiff_t dstride, \
-                                             uint8_t *src, ptrdiff_t sstride, \
+                                             const uint8_t *src, ptrdiff_t sstride, \
                                              int h, int mx, int my)           \
 {                                                                             \
     int c = 8 - my, d = my;                                                   \
@@ -615,7 +615,7 @@ static void put_vp8_bilinear ## SIZE ## _v_c(uint8_t *dst, ptrdiff_t dstride, \
                                                                               \
 static void put_vp8_bilinear ## SIZE ## _hv_c(uint8_t *dst,                   \
                                               ptrdiff_t dstride,              \
-                                              uint8_t *src,                   \
+                                              const uint8_t *src,             \
                                               ptrdiff_t sstride,              \
                                               int h, int mx, int my)          \
 {                                                                             \
diff --git a/libavcodec/vp8dsp.h b/libavcodec/vp8dsp.h
index bbd7f60a4f..16b5e9c35b 100644
--- a/libavcodec/vp8dsp.h
+++ b/libavcodec/vp8dsp.h
@@ -31,7 +31,7 @@
 #include <stdint.h>
 
 typedef void (*vp8_mc_func)(uint8_t *dst /* align 8 */, ptrdiff_t dstStride,
-                            uint8_t *src /* align 1 */, ptrdiff_t srcStride,
+                            const uint8_t *src /* align 1 */, ptrdiff_t srcStride,
                             int h, int x, int y);
 
 typedef struct VP8DSPContext {
diff --git a/libavcodec/x86/vp8dsp.asm b/libavcodec/x86/vp8dsp.asm
index 1c59e884ed..33d488bf6f 100644
--- a/libavcodec/x86/vp8dsp.asm
+++ b/libavcodec/x86/vp8dsp.asm
@@ -157,7 +157,7 @@ SECTION .text
 ; subpel MC functions:
 ;
 ; void ff_put_vp8_epel<size>_h<htap>v<vtap>_<opt>(uint8_t *dst, ptrdiff_t deststride,
-;                                                 uint8_t *src, ptrdiff_t srcstride,
+;                                                 const uint8_t *src, ptrdiff_t srcstride,
 ;                                                 int height,   int mx, int my);
 ;-------------------------------------------------------------------------------
 
diff --git a/libavcodec/x86/vp8dsp_init.c b/libavcodec/x86/vp8dsp_init.c
index cceb346ced..bd20da1fc9 100644
--- a/libavcodec/x86/vp8dsp_init.c
+++ b/libavcodec/x86/vp8dsp_init.c
@@ -32,93 +32,93 @@
  * MC functions
  */
 void ff_put_vp8_epel4_h4_mmxext(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel4_h6_mmxext(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel4_v4_mmxext(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel4_v6_mmxext(uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 
 void ff_put_vp8_epel8_h4_sse2  (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel8_h6_sse2  (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel8_v4_sse2  (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel8_v6_sse2  (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 
 void ff_put_vp8_epel4_h4_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel4_h6_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel4_v4_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel4_v6_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel8_h4_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel8_h6_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel8_v4_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 void ff_put_vp8_epel8_v6_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                uint8_t *src, ptrdiff_t srcstride,
+                                const uint8_t *src, ptrdiff_t srcstride,
                                 int height, int mx, int my);
 
 void ff_put_vp8_bilinear4_h_mmxext(uint8_t *dst, ptrdiff_t dststride,
-                                   uint8_t *src, ptrdiff_t srcstride,
+                                   const uint8_t *src, ptrdiff_t srcstride,
                                    int height, int mx, int my);
 void ff_put_vp8_bilinear8_h_sse2  (uint8_t *dst, ptrdiff_t dststride,
-                                   uint8_t *src, ptrdiff_t srcstride,
+                                   const uint8_t *src, ptrdiff_t srcstride,
                                    int height, int mx, int my);
 void ff_put_vp8_bilinear4_h_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                   uint8_t *src, ptrdiff_t srcstride,
+                                   const uint8_t *src, ptrdiff_t srcstride,
                                    int height, int mx, int my);
 void ff_put_vp8_bilinear8_h_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                   uint8_t *src, ptrdiff_t srcstride,
+                                   const uint8_t *src, ptrdiff_t srcstride,
                                    int height, int mx, int my);
 
 void ff_put_vp8_bilinear4_v_mmxext(uint8_t *dst, ptrdiff_t dststride,
-                                   uint8_t *src, ptrdiff_t srcstride,
+                                   const uint8_t *src, ptrdiff_t srcstride,
                                    int height, int mx, int my);
 void ff_put_vp8_bilinear8_v_sse2  (uint8_t *dst, ptrdiff_t dststride,
-                                   uint8_t *src, ptrdiff_t srcstride,
+                                   const uint8_t *src, ptrdiff_t srcstride,
                                    int height, int mx, int my);
 void ff_put_vp8_bilinear4_v_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                   uint8_t *src, ptrdiff_t srcstride,
+                                   const uint8_t *src, ptrdiff_t srcstride,
                                    int height, int mx, int my);
 void ff_put_vp8_bilinear8_v_ssse3 (uint8_t *dst, ptrdiff_t dststride,
-                                   uint8_t *src, ptrdiff_t srcstride,
+                                   const uint8_t *src, ptrdiff_t srcstride,
                                    int height, int mx, int my);
 
 
 void ff_put_vp8_pixels8_mmx (uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int height, int mx, int my);
 void ff_put_vp8_pixels16_sse(uint8_t *dst, ptrdiff_t dststride,
-                             uint8_t *src, ptrdiff_t srcstride,
+                             const uint8_t *src, ptrdiff_t srcstride,
                              int height, int mx, int my);
 
 #define TAP_W16(OPT, FILTERTYPE, TAPTYPE) \
 static void ff_put_vp8_ ## FILTERTYPE ## 16_ ## TAPTYPE ## _ ## OPT( \
-    uint8_t *dst,  ptrdiff_t dststride, uint8_t *src, \
+    uint8_t *dst,  ptrdiff_t dststride, const uint8_t *src, \
     ptrdiff_t srcstride, int height, int mx, int my) \
 { \
     ff_put_vp8_ ## FILTERTYPE ## 8_ ## TAPTYPE ## _ ## OPT( \
@@ -149,7 +149,7 @@ TAP_W16(ssse3, bilinear, v)
 
 #define HVTAP(OPT, ALIGN, TAPNUMX, TAPNUMY, SIZE, MAXHEIGHT) \
 static void ff_put_vp8_epel ## SIZE ## _h ## TAPNUMX ## v ## TAPNUMY ## _ ## OPT( \
-    uint8_t *dst, ptrdiff_t dststride, uint8_t *src, \
+    uint8_t *dst, ptrdiff_t dststride, const uint8_t *src, \
     ptrdiff_t srcstride, int height, int mx, int my) \
 { \
     LOCAL_ALIGNED(ALIGN, uint8_t, tmp, [SIZE * (MAXHEIGHT + TAPNUMY - 1)]); \
@@ -186,7 +186,7 @@ HVTAP(ssse3, 16, 6, 6, 4, 8)
 
 #define HVBILIN(OPT, ALIGN, SIZE, MAXHEIGHT) \
 static void ff_put_vp8_bilinear ## SIZE ## _hv_ ## OPT( \
-    uint8_t *dst, ptrdiff_t dststride, uint8_t *src, \
+    uint8_t *dst, ptrdiff_t dststride, const uint8_t *src, \
     ptrdiff_t srcstride, int height, int mx, int my) \
 { \
     LOCAL_ALIGNED(ALIGN, uint8_t, tmp, [SIZE * (MAXHEIGHT + 2)]); \