diff --git a/libavcodec/arm/dsputil_init_armv6.c b/libavcodec/arm/dsputil_init_armv6.c
index 765ccb3151..17d55eaac7 100644
--- a/libavcodec/arm/dsputil_init_armv6.c
+++ b/libavcodec/arm/dsputil_init_armv6.c
@@ -23,6 +23,7 @@
 #include "libavutil/attributes.h"
 #include "libavcodec/avcodec.h"
 #include "libavcodec/dsputil.h"
+#include "libavcodec/mpegvideo.h"
 #include "dsputil_arm.h"
 
 void ff_simple_idct_armv6(int16_t *data);
@@ -36,17 +37,17 @@ void ff_get_pixels_armv6(int16_t *block, const uint8_t *pixels, int stride);
 void ff_diff_pixels_armv6(int16_t *block, const uint8_t *s1,
                           const uint8_t *s2, int stride);
 
-int ff_pix_abs16_armv6(void *s, uint8_t *blk1, uint8_t *blk2,
+int ff_pix_abs16_armv6(MpegEncContext *s, uint8_t *blk1, uint8_t *blk2,
                        int line_size, int h);
-int ff_pix_abs16_x2_armv6(void *s, uint8_t *blk1, uint8_t *blk2,
+int ff_pix_abs16_x2_armv6(MpegEncContext *s, uint8_t *blk1, uint8_t *blk2,
                           int line_size, int h);
-int ff_pix_abs16_y2_armv6(void *s, uint8_t *blk1, uint8_t *blk2,
+int ff_pix_abs16_y2_armv6(MpegEncContext *s, uint8_t *blk1, uint8_t *blk2,
                           int line_size, int h);
 
-int ff_pix_abs8_armv6(void *s, uint8_t *blk1, uint8_t *blk2,
+int ff_pix_abs8_armv6(MpegEncContext *s, uint8_t *blk1, uint8_t *blk2,
                       int line_size, int h);
 
-int ff_sse16_armv6(void *s, uint8_t *blk1, uint8_t *blk2,
+int ff_sse16_armv6(MpegEncContext *s, uint8_t *blk1, uint8_t *blk2,
                    int line_size, int h);
 
 int ff_pix_norm1_armv6(uint8_t *pix, int line_size);
diff --git a/libavcodec/bfin/dsputil_init.c b/libavcodec/bfin/dsputil_init.c
index f488625ba6..92bd354ff3 100644
--- a/libavcodec/bfin/dsputil_init.c
+++ b/libavcodec/bfin/dsputil_init.c
@@ -28,6 +28,7 @@
 #include "libavutil/bfin/attributes.h"
 #include "libavcodec/avcodec.h"
 #include "libavcodec/dsputil.h"
+#include "libavcodec/mpegvideo.h"
 
 void ff_bfin_idct(int16_t *block) attribute_l1_text;
 void ff_bfin_fdct(int16_t *block) attribute_l1_text;
@@ -50,11 +51,11 @@ int ff_bfin_z_sad8x8(uint8_t *blk1, uint8_t *blk2, int dsz,
 int ff_bfin_z_sad16x16(uint8_t *blk1, uint8_t *blk2, int dsz,
                        int line_size, int h) attribute_l1_text;
 
-int ff_bfin_sse4(void *v, uint8_t *pix1, uint8_t *pix2,
+int ff_bfin_sse4(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                  int line_size, int h) attribute_l1_text;
-int ff_bfin_sse8(void *v, uint8_t *pix1, uint8_t *pix2,
+int ff_bfin_sse8(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                  int line_size, int h) attribute_l1_text;
-int ff_bfin_sse16(void *v, uint8_t *pix1, uint8_t *pix2,
+int ff_bfin_sse16(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                   int line_size, int h) attribute_l1_text;
 
 static void bfin_idct_add(uint8_t *dest, int line_size, int16_t *block)
@@ -81,7 +82,7 @@ static void bfin_clear_blocks(int16_t *blocks)
              ::"a" (blocks) : "P0", "I0", "R0");
 }
 
-static int bfin_pix_abs16(void *c, uint8_t *blk1, uint8_t *blk2,
+static int bfin_pix_abs16(MpegEncContext *c, uint8_t *blk1, uint8_t *blk2,
                           int line_size, int h)
 {
     return ff_bfin_z_sad16x16(blk1, blk2, line_size, line_size, h);
@@ -89,48 +90,48 @@ static int bfin_pix_abs16(void *c, uint8_t *blk1, uint8_t *blk2,
 
 static uint8_t vtmp_blk[256] attribute_l1_data_b;
 
-static int bfin_pix_abs16_x2(void *c, uint8_t *blk1, uint8_t *blk2,
+static int bfin_pix_abs16_x2(MpegEncContext *c, uint8_t *blk1, uint8_t *blk2,
                              int line_size, int h)
 {
     ff_bfin_put_pixels16uc(vtmp_blk, blk2, blk2 + 1, 16, line_size, h);
     return ff_bfin_z_sad16x16(blk1, vtmp_blk, line_size, 16, h);
 }
 
-static int bfin_pix_abs16_y2(void *c, uint8_t *blk1, uint8_t *blk2,
+static int bfin_pix_abs16_y2(MpegEncContext *c, uint8_t *blk1, uint8_t *blk2,
                              int line_size, int h)
 {
     ff_bfin_put_pixels16uc(vtmp_blk, blk2, blk2 + line_size, 16, line_size, h);
     return ff_bfin_z_sad16x16(blk1, vtmp_blk, line_size, 16, h);
 }
 
-static int bfin_pix_abs16_xy2(void *c, uint8_t *blk1, uint8_t *blk2,
+static int bfin_pix_abs16_xy2(MpegEncContext *c, uint8_t *blk1, uint8_t *blk2,
                               int line_size, int h)
 {
     ff_bfin_z_put_pixels16_xy2(vtmp_blk, blk2, 16, line_size, h);
     return ff_bfin_z_sad16x16(blk1, vtmp_blk, line_size, 16, h);
 }
 
-static int bfin_pix_abs8(void *c, uint8_t *blk1, uint8_t *blk2,
+static int bfin_pix_abs8(MpegEncContext *c, uint8_t *blk1, uint8_t *blk2,
                          int line_size, int h)
 {
     return ff_bfin_z_sad8x8(blk1, blk2, line_size, line_size, h);
 }
 
-static int bfin_pix_abs8_x2(void *c, uint8_t *blk1, uint8_t *blk2,
+static int bfin_pix_abs8_x2(MpegEncContext *c, uint8_t *blk1, uint8_t *blk2,
                             int line_size, int h)
 {
     ff_bfin_put_pixels8uc(vtmp_blk, blk2, blk2 + 1, 8, line_size, h);
     return ff_bfin_z_sad8x8(blk1, vtmp_blk, line_size, 8, h);
 }
 
-static int bfin_pix_abs8_y2(void *c, uint8_t *blk1, uint8_t *blk2,
+static int bfin_pix_abs8_y2(MpegEncContext *c, uint8_t *blk1, uint8_t *blk2,
                             int line_size, int h)
 {
     ff_bfin_put_pixels8uc(vtmp_blk, blk2, blk2 + line_size, 8, line_size, h);
     return ff_bfin_z_sad8x8(blk1, vtmp_blk, line_size, 8, h);
 }
 
-static int bfin_pix_abs8_xy2(void *c, uint8_t *blk1, uint8_t *blk2,
+static int bfin_pix_abs8_xy2(MpegEncContext *c, uint8_t *blk1, uint8_t *blk2,
                              int line_size, int h)
 {
     ff_bfin_z_put_pixels8_xy2(vtmp_blk, blk2, 8, line_size, h);
diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index c7e7fe6e29..eeeda7c23c 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -254,7 +254,8 @@ static void bswap16_buf(uint16_t *dst, const uint16_t *src, int len)
         *dst++ = av_bswap16(*src++);
 }
 
-static int sse4_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
+static int sse4_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                  int line_size, int h)
 {
     int s = 0, i;
     uint32_t *sq = ff_square_tab + 256;
@@ -270,7 +271,8 @@ static int sse4_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
     return s;
 }
 
-static int sse8_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
+static int sse8_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                  int line_size, int h)
 {
     int s = 0, i;
     uint32_t *sq = ff_square_tab + 256;
@@ -290,7 +292,8 @@ static int sse8_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
     return s;
 }
 
-static int sse16_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
+static int sse16_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                   int line_size, int h)
 {
     int s = 0, i;
     uint32_t *sq = ff_square_tab + 256;
@@ -1742,7 +1745,7 @@ static void put_mspel8_mc22_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
     wmv2_mspel8_v_lowpass(dst, halfH + 8, stride, 8, 8);
 }
 
-static inline int pix_abs16_c(void *v, uint8_t *pix1, uint8_t *pix2,
+static inline int pix_abs16_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                               int line_size, int h)
 {
     int s = 0, i;
@@ -1770,7 +1773,7 @@ static inline int pix_abs16_c(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int pix_abs16_x2_c(void *v, uint8_t *pix1, uint8_t *pix2,
+static int pix_abs16_x2_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                           int line_size, int h)
 {
     int s = 0, i;
@@ -1798,7 +1801,7 @@ static int pix_abs16_x2_c(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int pix_abs16_y2_c(void *v, uint8_t *pix1, uint8_t *pix2,
+static int pix_abs16_y2_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                           int line_size, int h)
 {
     int s = 0, i;
@@ -1828,7 +1831,7 @@ static int pix_abs16_y2_c(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int pix_abs16_xy2_c(void *v, uint8_t *pix1, uint8_t *pix2,
+static int pix_abs16_xy2_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                            int line_size, int h)
 {
     int s = 0, i;
@@ -1858,7 +1861,7 @@ static int pix_abs16_xy2_c(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static inline int pix_abs8_c(void *v, uint8_t *pix1, uint8_t *pix2,
+static inline int pix_abs8_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                              int line_size, int h)
 {
     int s = 0, i;
@@ -1878,7 +1881,7 @@ static inline int pix_abs8_c(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int pix_abs8_x2_c(void *v, uint8_t *pix1, uint8_t *pix2,
+static int pix_abs8_x2_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                          int line_size, int h)
 {
     int s = 0, i;
@@ -1898,7 +1901,7 @@ static int pix_abs8_x2_c(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int pix_abs8_y2_c(void *v, uint8_t *pix1, uint8_t *pix2,
+static int pix_abs8_y2_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                          int line_size, int h)
 {
     int s = 0, i;
@@ -1920,7 +1923,7 @@ static int pix_abs8_y2_c(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int pix_abs8_xy2_c(void *v, uint8_t *pix1, uint8_t *pix2,
+static int pix_abs8_xy2_c(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                           int line_size, int h)
 {
     int s = 0, i;
@@ -1942,9 +1945,8 @@ static int pix_abs8_xy2_c(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int nsse16_c(void *v, uint8_t *s1, uint8_t *s2, int stride, int h)
+static int nsse16_c(MpegEncContext *c, uint8_t *s1, uint8_t *s2, int stride, int h)
 {
-    MpegEncContext *c = v;
     int score1 = 0, score2 = 0, x, y;
 
     for (y = 0; y < h; y++) {
@@ -1967,9 +1969,8 @@ static int nsse16_c(void *v, uint8_t *s1, uint8_t *s2, int stride, int h)
         return score1 + FFABS(score2) * 8;
 }
 
-static int nsse8_c(void *v, uint8_t *s1, uint8_t *s2, int stride, int h)
+static int nsse8_c(MpegEncContext *c, uint8_t *s1, uint8_t *s2, int stride, int h)
 {
-    MpegEncContext *c = v;
     int score1 = 0, score2 = 0, x, y;
 
     for (y = 0; y < h; y++) {
@@ -2021,7 +2022,8 @@ static void add_8x8basis_c(int16_t rem[64], int16_t basis[64], int scale)
                   (BASIS_SHIFT - RECON_SHIFT);
 }
 
-static int zero_cmp(void *s, uint8_t *a, uint8_t *b, int stride, int h)
+static int zero_cmp(MpegEncContext *s, uint8_t *a, uint8_t *b,
+                    int stride, int h)
 {
     return 0;
 }
@@ -2245,7 +2247,7 @@ static void add_hfyu_left_prediction_bgr32_c(uint8_t *dst, const uint8_t *src,
 
 #define BUTTERFLYA(x, y) (FFABS((x) + (y)) + FFABS((x) - (y)))
 
-static int hadamard8_diff8x8_c(/* MpegEncContext */ void *s, uint8_t *dst,
+static int hadamard8_diff8x8_c(MpegEncContext *s, uint8_t *dst,
                                uint8_t *src, int stride, int h)
 {
     int i, temp[64], sum = 0;
@@ -2297,7 +2299,7 @@ static int hadamard8_diff8x8_c(/* MpegEncContext */ void *s, uint8_t *dst,
     return sum;
 }
 
-static int hadamard8_intra8x8_c(/* MpegEncContext */ void *s, uint8_t *src,
+static int hadamard8_intra8x8_c(MpegEncContext *s, uint8_t *src,
                                 uint8_t *dummy, int stride, int h)
 {
     int i, temp[64], sum = 0;
@@ -2349,10 +2351,9 @@ static int hadamard8_intra8x8_c(/* MpegEncContext */ void *s, uint8_t *src,
     return sum;
 }
 
-static int dct_sad8x8_c(/* MpegEncContext */ void *c, uint8_t *src1,
+static int dct_sad8x8_c(MpegEncContext *s, uint8_t *src1,
                         uint8_t *src2, int stride, int h)
 {
-    MpegEncContext *const s = (MpegEncContext *) c;
     LOCAL_ALIGNED_16(int16_t, temp, [64]);
 
     av_assert2(h == 8);
@@ -2391,10 +2392,9 @@ static int dct_sad8x8_c(/* MpegEncContext */ void *c, uint8_t *src1,
         DST(7, (a4 >> 2) - a7);                         \
     }
 
-static int dct264_sad8x8_c(/* MpegEncContext */ void *c, uint8_t *src1,
+static int dct264_sad8x8_c(MpegEncContext *s, uint8_t *src1,
                            uint8_t *src2, int stride, int h)
 {
-    MpegEncContext *const s = (MpegEncContext *) c;
     int16_t dct[8][8];
     int i, sum = 0;
 
@@ -2417,10 +2417,9 @@ static int dct264_sad8x8_c(/* MpegEncContext */ void *c, uint8_t *src1,
 }
 #endif
 
-static int dct_max8x8_c(/* MpegEncContext */ void *c, uint8_t *src1,
+static int dct_max8x8_c(MpegEncContext *s, uint8_t *src1,
                         uint8_t *src2, int stride, int h)
 {
-    MpegEncContext *const s = (MpegEncContext *) c;
     LOCAL_ALIGNED_16(int16_t, temp, [64]);
     int sum = 0, i;
 
@@ -2435,10 +2434,9 @@ static int dct_max8x8_c(/* MpegEncContext */ void *c, uint8_t *src1,
     return sum;
 }
 
-static int quant_psnr8x8_c(/* MpegEncContext */ void *c, uint8_t *src1,
+static int quant_psnr8x8_c(MpegEncContext *s, uint8_t *src1,
                            uint8_t *src2, int stride, int h)
 {
-    MpegEncContext *const s = c;
     LOCAL_ALIGNED_16(int16_t, temp, [64 * 2]);
     int16_t *const bak = temp + 64;
     int sum = 0, i;
@@ -2461,10 +2459,9 @@ static int quant_psnr8x8_c(/* MpegEncContext */ void *c, uint8_t *src1,
     return sum;
 }
 
-static int rd8x8_c(/* MpegEncContext */ void *c, uint8_t *src1, uint8_t *src2,
+static int rd8x8_c(MpegEncContext *s, uint8_t *src1, uint8_t *src2,
                    int stride, int h)
 {
-    MpegEncContext *const s  = (MpegEncContext *) c;
     const uint8_t *scantable = s->intra_scantable.permutated;
     LOCAL_ALIGNED_16(int16_t, temp, [64]);
     LOCAL_ALIGNED_16(uint8_t, lsrc1, [64]);
@@ -2539,10 +2536,9 @@ static int rd8x8_c(/* MpegEncContext */ void *c, uint8_t *src1, uint8_t *src2,
     return distortion + ((bits * s->qscale * s->qscale * 109 + 64) >> 7);
 }
 
-static int bit8x8_c(/* MpegEncContext */ void *c, uint8_t *src1, uint8_t *src2,
+static int bit8x8_c(MpegEncContext *s, uint8_t *src1, uint8_t *src2,
                     int stride, int h)
 {
-    MpegEncContext *const s  = (MpegEncContext *) c;
     const uint8_t *scantable = s->intra_scantable.permutated;
     LOCAL_ALIGNED_16(int16_t, temp, [64]);
     int i, last, run, bits, level, start_i;
@@ -2602,7 +2598,7 @@ static int bit8x8_c(/* MpegEncContext */ void *c, uint8_t *src1, uint8_t *src2,
 }
 
 #define VSAD_INTRA(size)                                                \
-static int vsad_intra ## size ## _c(/* MpegEncContext */ void *c,       \
+static int vsad_intra ## size ## _c(MpegEncContext *c,                  \
                                     uint8_t *s, uint8_t *dummy,         \
                                     int stride, int h)                  \
 {                                                                       \
@@ -2623,7 +2619,7 @@ static int vsad_intra ## size ## _c(/* MpegEncContext */ void *c,       \
 VSAD_INTRA(8)
 VSAD_INTRA(16)
 
-static int vsad16_c(/* MpegEncContext */ void *c, uint8_t *s1, uint8_t *s2,
+static int vsad16_c(MpegEncContext *c, uint8_t *s1, uint8_t *s2,
                     int stride, int h)
 {
     int score = 0, x, y;
@@ -2640,7 +2636,7 @@ static int vsad16_c(/* MpegEncContext */ void *c, uint8_t *s1, uint8_t *s2,
 
 #define SQ(a) ((a) * (a))
 #define VSSE_INTRA(size)                                                \
-static int vsse_intra ## size ## _c(/* MpegEncContext */ void *c,       \
+static int vsse_intra ## size ## _c(MpegEncContext *c,                  \
                                     uint8_t *s, uint8_t *dummy,         \
                                     int stride, int h)                  \
 {                                                                       \
@@ -2661,7 +2657,7 @@ static int vsse_intra ## size ## _c(/* MpegEncContext */ void *c,       \
 VSSE_INTRA(8)
 VSSE_INTRA(16)
 
-static int vsse16_c(/* MpegEncContext */ void *c, uint8_t *s1, uint8_t *s2,
+static int vsse16_c(MpegEncContext *c, uint8_t *s1, uint8_t *s2,
                     int stride, int h)
 {
     int score = 0, x, y;
@@ -2687,8 +2683,7 @@ static int ssd_int8_vs_int16_c(const int8_t *pix1, const int16_t *pix2,
 }
 
 #define WRAPPER8_16_SQ(name8, name16)                                   \
-static int name16(void /*MpegEncContext*/ *s,                           \
-                  uint8_t *dst, uint8_t *src,                           \
+static int name16(MpegEncContext *s, uint8_t *dst, uint8_t *src,        \
                   int stride, int h)                                    \
 {                                                                       \
     int score = 0;                                                      \
diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
index 3f35e420f0..4e16c92bde 100644
--- a/libavcodec/dsputil.h
+++ b/libavcodec/dsputil.h
@@ -108,12 +108,13 @@ DEF_OLD_QPEL(qpel8_mc32_old_c)
 DEF_OLD_QPEL(qpel8_mc13_old_c)
 DEF_OLD_QPEL(qpel8_mc33_old_c)
 
+struct MpegEncContext;
 /* Motion estimation:
  * h is limited to { width / 2, width, 2 * width },
  * but never larger than 16 and never smaller than 2.
  * Although currently h < 4 is not used as functions with
  * width < 8 are neither used nor implemented. */
-typedef int (*me_cmp_func)(void /* MpegEncContext */ *s,
+typedef int (*me_cmp_func)(struct MpegEncContext *c,
                            uint8_t *blk1 /* align width (8 or 16) */,
                            uint8_t *blk2 /* align 1 */, int line_size, int h);
 
diff --git a/libavcodec/motion_est.c b/libavcodec/motion_est.c
index 0e5f9d1baa..19053967a5 100644
--- a/libavcodec/motion_est.c
+++ b/libavcodec/motion_est.c
@@ -286,7 +286,9 @@ static int cmp_qpel(MpegEncContext *s, const int x, const int y, const int subx,
 
 #include "motion_est_template.c"
 
-static int zero_cmp(void *s, uint8_t *a, uint8_t *b, int stride, int h){
+static int zero_cmp(MpegEncContext *s, uint8_t *a, uint8_t *b,
+                    int stride, int h)
+{
     return 0;
 }
 
diff --git a/libavcodec/ppc/dsputil_altivec.c b/libavcodec/ppc/dsputil_altivec.c
index eb8e5703c6..cb6f1e1329 100644
--- a/libavcodec/ppc/dsputil_altivec.c
+++ b/libavcodec/ppc/dsputil_altivec.c
@@ -30,9 +30,10 @@
 #include "libavutil/ppc/util_altivec.h"
 #include "libavcodec/avcodec.h"
 #include "libavcodec/dsputil.h"
+#include "libavcodec/mpegvideo.h"
 #include "dsputil_altivec.h"
 
-static int sad16_x2_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
+static int sad16_x2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                             int line_size, int h)
 {
     int i, s = 0;
@@ -74,7 +75,7 @@ static int sad16_x2_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int sad16_y2_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
+static int sad16_y2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                             int line_size, int h)
 {
     int i, s = 0;
@@ -128,7 +129,7 @@ static int sad16_y2_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int sad16_xy2_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
+static int sad16_xy2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                              int line_size, int h)
 {
     int i, s = 0;
@@ -223,7 +224,7 @@ static int sad16_xy2_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int sad16_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
+static int sad16_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                          int line_size, int h)
 {
     int i, s;
@@ -260,7 +261,7 @@ static int sad16_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
     return s;
 }
 
-static int sad8_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
+static int sad8_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                         int line_size, int h)
 {
     int i, s;
@@ -337,7 +338,7 @@ static int pix_norm1_altivec(uint8_t *pix, int line_size)
 
 /* Sum of Squared Errors for an 8x8 block, AltiVec-enhanced.
  * It's the sad8_altivec code above w/ squaring added. */
-static int sse8_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
+static int sse8_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                         int line_size, int h)
 {
     int i, s;
@@ -389,7 +390,7 @@ static int sse8_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
 
 /* Sum of Squared Errors for a 16x16 block, AltiVec-enhanced.
  * It's the sad16_altivec code above w/ squaring added. */
-static int sse16_altivec(void *v, uint8_t *pix1, uint8_t *pix2,
+static int sse16_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                          int line_size, int h)
 {
     int i, s;
@@ -587,7 +588,7 @@ static void add_bytes_altivec(uint8_t *dst, uint8_t *src, int w)
         dst[i] = src[i];
 }
 
-static int hadamard8_diff8x8_altivec(/* MpegEncContext */ void *s, uint8_t *dst,
+static int hadamard8_diff8x8_altivec(MpegEncContext *s, uint8_t *dst,
                                      uint8_t *src, int stride, int h)
 {
     int sum;
@@ -716,7 +717,7 @@ static int hadamard8_diff8x8_altivec(/* MpegEncContext */ void *s, uint8_t *dst,
  * On the 970, the hand-made RA is still a win (around 690 vs. around 780),
  * but xlc goes to around 660 on the regular C code...
  */
-static int hadamard8_diff16x8_altivec(/* MpegEncContext */ void *s, uint8_t *dst,
+static int hadamard8_diff16x8_altivec(MpegEncContext *s, uint8_t *dst,
                                       uint8_t *src, int stride, int h)
 {
     int sum;
@@ -913,7 +914,7 @@ static int hadamard8_diff16x8_altivec(/* MpegEncContext */ void *s, uint8_t *dst
     return sum;
 }
 
-static int hadamard8_diff16_altivec(/* MpegEncContext */ void *s, uint8_t *dst,
+static int hadamard8_diff16_altivec(MpegEncContext *s, uint8_t *dst,
                                     uint8_t *src, int stride, int h)
 {
     int score = hadamard8_diff16x8_altivec(s, dst, src, stride, 8);
diff --git a/libavcodec/x86/dsputilenc.asm b/libavcodec/x86/dsputilenc.asm
index a6a3aba61a..1f496ad32e 100644
--- a/libavcodec/x86/dsputilenc.asm
+++ b/libavcodec/x86/dsputilenc.asm
@@ -209,8 +209,8 @@ hadamard8x8_diff %+ SUFFIX:
 hadamard8_16_wrapper %1, 3
 %elif cpuflag(mmx)
 ALIGN 16
-; int ff_hadamard8_diff_ ## cpu(void *s, uint8_t *src1, uint8_t *src2,
-;                               int stride, int h)
+; int ff_hadamard8_diff_ ## cpu(MpegEncContext *s, uint8_t *src1,
+;                               uint8_t *src2, int stride, int h)
 ; r0 = void *s = unused, int h = unused (always 8)
 ; note how r1, r2 and r3 are not clobbered in this function, so 16x16
 ; can simply call this 2x2x (and that's why we access rsp+gprsize
@@ -275,7 +275,8 @@ INIT_XMM ssse3
 HADAMARD8_DIFF 9
 
 INIT_XMM sse2
-; int ff_sse16_sse2(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h);
+; int ff_sse16_sse2(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+;                   int line_size, int h);
 cglobal sse16, 5, 5, 8
     shr      r4d, 1
     pxor      m0, m0         ; mm0 = 0
diff --git a/libavcodec/x86/dsputilenc_mmx.c b/libavcodec/x86/dsputilenc_mmx.c
index da05d3689e..d61de6bcd6 100644
--- a/libavcodec/x86/dsputilenc_mmx.c
+++ b/libavcodec/x86/dsputilenc_mmx.c
@@ -41,7 +41,8 @@ int ff_pix_norm1_mmx(uint8_t *pix, int line_size);
 
 #if HAVE_INLINE_ASM
 
-static int sse8_mmx(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
+static int sse8_mmx(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                    int line_size, int h)
 {
     int tmp;
 
@@ -105,7 +106,7 @@ static int sse8_mmx(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
     return tmp;
 }
 
-static int sse16_mmx(void *v, uint8_t *pix1, uint8_t *pix2,
+static int sse16_mmx(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                      int line_size, int h)
 {
     int tmp;
@@ -414,10 +415,9 @@ static int hf_noise16_mmx(uint8_t *pix1, int line_size, int h)
     return tmp + hf_noise8_mmx(pix + 8, line_size, h);
 }
 
-static int nsse16_mmx(void *p, uint8_t *pix1, uint8_t *pix2,
+static int nsse16_mmx(MpegEncContext *c, uint8_t *pix1, uint8_t *pix2,
                       int line_size, int h)
 {
-    MpegEncContext *c = p;
     int score1, score2;
 
     if (c)
@@ -433,10 +433,9 @@ static int nsse16_mmx(void *p, uint8_t *pix1, uint8_t *pix2,
         return score1 + FFABS(score2) * 8;
 }
 
-static int nsse8_mmx(void *p, uint8_t *pix1, uint8_t *pix2,
+static int nsse8_mmx(MpegEncContext *c, uint8_t *pix1, uint8_t *pix2,
                      int line_size, int h)
 {
-    MpegEncContext *c = p;
     int score1 = sse8_mmx(c, pix1, pix2, line_size, h);
     int score2 = hf_noise8_mmx(pix1, line_size, h) -
                  hf_noise8_mmx(pix2, line_size, h);
@@ -447,7 +446,7 @@ static int nsse8_mmx(void *p, uint8_t *pix1, uint8_t *pix2,
         return score1 + FFABS(score2) * 8;
 }
 
-static int vsad_intra16_mmx(void *v, uint8_t *pix, uint8_t *dummy,
+static int vsad_intra16_mmx(MpegEncContext *v, uint8_t *pix, uint8_t *dummy,
                             int line_size, int h)
 {
     int tmp;
@@ -511,7 +510,7 @@ static int vsad_intra16_mmx(void *v, uint8_t *pix, uint8_t *dummy,
 }
 #undef SUM
 
-static int vsad_intra16_mmxext(void *v, uint8_t *pix, uint8_t *dummy,
+static int vsad_intra16_mmxext(MpegEncContext *v, uint8_t *pix, uint8_t *dummy,
                                int line_size, int h)
 {
     int tmp;
@@ -554,7 +553,7 @@ static int vsad_intra16_mmxext(void *v, uint8_t *pix, uint8_t *dummy,
 }
 #undef SUM
 
-static int vsad16_mmx(void *v, uint8_t *pix1, uint8_t *pix2,
+static int vsad16_mmx(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                       int line_size, int h)
 {
     int tmp;
@@ -635,7 +634,7 @@ static int vsad16_mmx(void *v, uint8_t *pix1, uint8_t *pix2,
 }
 #undef SUM
 
-static int vsad16_mmxext(void *v, uint8_t *pix1, uint8_t *pix2,
+static int vsad16_mmxext(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
                          int line_size, int h)
 {
     int tmp;
@@ -974,13 +973,14 @@ static int ssd_int8_vs_int16_mmx(const int8_t *pix1, const int16_t *pix2,
 
 #endif /* HAVE_INLINE_ASM */
 
-int ff_sse16_sse2(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h);
+int ff_sse16_sse2(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                  int line_size, int h);
 
 #define hadamard_func(cpu)                                              \
-int ff_hadamard8_diff_ ## cpu(void *s, uint8_t *src1, uint8_t *src2,    \
-                              int stride, int h);                       \
-int ff_hadamard8_diff16_ ## cpu(void *s, uint8_t *src1, uint8_t *src2,  \
-                                int stride, int h);
+    int ff_hadamard8_diff_ ## cpu(MpegEncContext *s, uint8_t *src1,     \
+                                  uint8_t *src2, int stride, int h);    \
+    int ff_hadamard8_diff16_ ## cpu(MpegEncContext *s, uint8_t *src1,   \
+                                    uint8_t *src2, int stride, int h);
 
 hadamard_func(mmx)
 hadamard_func(mmxext)
diff --git a/libavcodec/x86/motion_est.c b/libavcodec/x86/motion_est.c
index 90b83468a8..78db925313 100644
--- a/libavcodec/x86/motion_est.c
+++ b/libavcodec/x86/motion_est.c
@@ -27,6 +27,7 @@
 #include "libavutil/mem.h"
 #include "libavutil/x86/asm.h"
 #include "libavutil/x86/cpu.h"
+#include "libavcodec/mpegvideo.h"
 #include "dsputil_x86.h"
 
 #if HAVE_INLINE_ASM
@@ -94,7 +95,8 @@ static inline void sad8_1_mmxext(uint8_t *blk1, uint8_t *blk2,
         : "r" ((x86_reg) stride));
 }
 
-static int sad16_sse2(void *v, uint8_t *blk2, uint8_t *blk1, int stride, int h)
+static int sad16_sse2(MpegEncContext *v, uint8_t *blk2, uint8_t *blk1,
+                      int stride, int h)
 {
     int ret;
     __asm__ volatile (
@@ -325,7 +327,7 @@ static inline void sad8_y2a_mmx(uint8_t *blk1, uint8_t *blk2, int stride, int h)
 }
 
 #define PIX_SAD(suf)                                                    \
-static int sad8_ ## suf(void *v, uint8_t *blk2,                         \
+static int sad8_ ## suf(MpegEncContext *v, uint8_t *blk2,               \
                         uint8_t *blk1, int stride, int h)               \
 {                                                                       \
     av_assert2(h == 8);                                                     \
@@ -339,7 +341,7 @@ static int sad8_ ## suf(void *v, uint8_t *blk2,                         \
     return sum_ ## suf();                                               \
 }                                                                       \
                                                                         \
-static int sad8_x2_ ## suf(void *v, uint8_t *blk2,                      \
+static int sad8_x2_ ## suf(MpegEncContext *v, uint8_t *blk2,            \
                            uint8_t *blk1, int stride, int h)            \
 {                                                                       \
     av_assert2(h == 8);                                                     \
@@ -354,7 +356,7 @@ static int sad8_x2_ ## suf(void *v, uint8_t *blk2,                      \
     return sum_ ## suf();                                               \
 }                                                                       \
                                                                         \
-static int sad8_y2_ ## suf(void *v, uint8_t *blk2,                      \
+static int sad8_y2_ ## suf(MpegEncContext *v, uint8_t *blk2,            \
                            uint8_t *blk1, int stride, int h)            \
 {                                                                       \
     av_assert2(h == 8);                                                     \
@@ -369,7 +371,7 @@ static int sad8_y2_ ## suf(void *v, uint8_t *blk2,                      \
     return sum_ ## suf();                                               \
 }                                                                       \
                                                                         \
-static int sad8_xy2_ ## suf(void *v, uint8_t *blk2,                     \
+static int sad8_xy2_ ## suf(MpegEncContext *v, uint8_t *blk2,           \
                             uint8_t *blk1, int stride, int h)           \
 {                                                                       \
     av_assert2(h == 8);                                                     \
@@ -383,7 +385,7 @@ static int sad8_xy2_ ## suf(void *v, uint8_t *blk2,                     \
     return sum_ ## suf();                                               \
 }                                                                       \
                                                                         \
-static int sad16_ ## suf(void *v, uint8_t *blk2,                        \
+static int sad16_ ## suf(MpegEncContext *v, uint8_t *blk2,              \
                          uint8_t *blk1, int stride, int h)              \
 {                                                                       \
     __asm__ volatile (                                                  \
@@ -397,7 +399,7 @@ static int sad16_ ## suf(void *v, uint8_t *blk2,                        \
     return sum_ ## suf();                                               \
 }                                                                       \
                                                                         \
-static int sad16_x2_ ## suf(void *v, uint8_t *blk2,                     \
+static int sad16_x2_ ## suf(MpegEncContext *v, uint8_t *blk2,           \
                             uint8_t *blk1, int stride, int h)           \
 {                                                                       \
     __asm__ volatile (                                                  \
@@ -412,7 +414,7 @@ static int sad16_x2_ ## suf(void *v, uint8_t *blk2,                     \
     return sum_ ## suf();                                               \
 }                                                                       \
                                                                         \
-static int sad16_y2_ ## suf(void *v, uint8_t *blk2,                     \
+static int sad16_y2_ ## suf(MpegEncContext *v, uint8_t *blk2,           \
                             uint8_t *blk1, int stride, int h)           \
 {                                                                       \
     __asm__ volatile (                                                  \
@@ -427,7 +429,7 @@ static int sad16_y2_ ## suf(void *v, uint8_t *blk2,                     \
     return sum_ ## suf();                                               \
 }                                                                       \
                                                                         \
-static int sad16_xy2_ ## suf(void *v, uint8_t *blk2,                    \
+static int sad16_xy2_ ## suf(MpegEncContext *v, uint8_t *blk2,          \
                              uint8_t *blk1, int stride, int h)          \
 {                                                                       \
     __asm__ volatile (                                                  \