diff --git a/libavcodec/vp5.c b/libavcodec/vp5.c
index 1479344ba4..489bcac828 100644
--- a/libavcodec/vp5.c
+++ b/libavcodec/vp5.c
@@ -42,7 +42,7 @@ static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
     vp56_init_range_decoder(&s->c, buf, buf_size);
     s->framep[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
     vp56_rac_get(c);
-    vp56_init_dequant(s, vp56_rac_gets(c, 6));
+    ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
     if (s->framep[VP56_FRAME_CURRENT]->key_frame)
     {
         vp56_rac_gets(c, 8);
@@ -254,7 +254,7 @@ static av_cold int vp5_decode_init(AVCodecContext *avctx)
 {
     VP56Context *s = avctx->priv_data;
 
-    vp56_init(avctx, 1, 0);
+    ff_vp56_init(avctx, 1, 0);
     s->vp56_coord_div = vp5_coord_div;
     s->parse_vector_adjustment = vp5_parse_vector_adjustment;
     s->parse_coeff = vp5_parse_coeff;
@@ -273,8 +273,8 @@ AVCodec vp5_decoder = {
     sizeof(VP56Context),
     vp5_decode_init,
     NULL,
-    vp56_free,
-    vp56_decode_frame,
+    ff_vp56_free,
+    ff_vp56_decode_frame,
     CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
 };
diff --git a/libavcodec/vp56.c b/libavcodec/vp56.c
index 74fe5ff5f4..9f913850eb 100644
--- a/libavcodec/vp56.c
+++ b/libavcodec/vp56.c
@@ -28,7 +28,7 @@
 #include "vp56data.h"
 
 
-void vp56_init_dequant(VP56Context *s, int quantizer)
+void ff_vp56_init_dequant(VP56Context *s, int quantizer)
 {
     s->quantizer = quantizer;
     s->dequant_dc = vp56_dc_dequant[quantizer] << 2;
@@ -481,7 +481,7 @@ static int vp56_size_changed(AVCodecContext *avctx)
     return 0;
 }
 
-int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                       AVPacket *avpkt)
 {
     const uint8_t *buf = avpkt->data;
@@ -639,7 +639,7 @@ int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     return avpkt->size;
 }
 
-av_cold void vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
+av_cold void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
 {
     VP56Context *s = avctx->priv_data;
     int i;
@@ -678,7 +678,7 @@ av_cold void vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
     }
 }
 
-av_cold int vp56_free(AVCodecContext *avctx)
+av_cold int ff_vp56_free(AVCodecContext *avctx)
 {
     VP56Context *s = avctx->priv_data;
 
diff --git a/libavcodec/vp56.h b/libavcodec/vp56.h
index 1eacdc2158..efc403e110 100644
--- a/libavcodec/vp56.h
+++ b/libavcodec/vp56.h
@@ -170,10 +170,10 @@ struct vp56_context {
 };
 
 
-void vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
-int vp56_free(AVCodecContext *avctx);
-void vp56_init_dequant(VP56Context *s, int quantizer);
-int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
+int ff_vp56_free(AVCodecContext *avctx);
+void ff_vp56_init_dequant(VP56Context *s, int quantizer);
+int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                       AVPacket *avpkt);
 
 
diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
index f8bcd4be37..121fb84d32 100644
--- a/libavcodec/vp6.c
+++ b/libavcodec/vp6.c
@@ -54,7 +54,7 @@ static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
     int separated_coeff = buf[0] & 1;
 
     s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
-    vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
+    ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
 
     if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
         sub_version = buf[1] >> 3;
@@ -576,7 +576,7 @@ static av_cold int vp6_decode_init(AVCodecContext *avctx)
 {
     VP56Context *s = avctx->priv_data;
 
-    vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
+    ff_vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
                      avctx->codec->id == CODEC_ID_VP6A);
     s->vp56_coord_div = vp6_coord_div;
     s->parse_vector_adjustment = vp6_parse_vector_adjustment;
@@ -594,7 +594,7 @@ static av_cold int vp6_decode_free(AVCodecContext *avctx)
     VP56Context *s = avctx->priv_data;
     int pt, ct, cg;
 
-    vp56_free(avctx);
+    ff_vp56_free(avctx);
 
     for (pt=0; pt<2; pt++) {
         free_vlc(&s->dccv_vlc[pt]);
@@ -614,7 +614,7 @@ AVCodec vp6_decoder = {
     vp6_decode_init,
     NULL,
     vp6_decode_free,
-    vp56_decode_frame,
+    ff_vp56_decode_frame,
     CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
 };
@@ -628,7 +628,7 @@ AVCodec vp6f_decoder = {
     vp6_decode_init,
     NULL,
     vp6_decode_free,
-    vp56_decode_frame,
+    ff_vp56_decode_frame,
     CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
 };
@@ -642,7 +642,7 @@ AVCodec vp6a_decoder = {
     vp6_decode_init,
     NULL,
     vp6_decode_free,
-    vp56_decode_frame,
+    ff_vp56_decode_frame,
     CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
 };