Add ff_ to AVHWAccel decoders

That unbreaks compilation of vaapi and dxva2
Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
(cherry picked from commit d1b6f33b)

libavcodec/dxva2_h264.c

@@ -423,7 +423,7 @@ static int end_frame(AVCodecContext *avctx)
                                      commit_bitstream_and_slice_buffer);
 }
 
-AVHWAccel h264_dxva2_hwaccel = {
+AVHWAccel ff_h264_dxva2_hwaccel = {
     .name           = "h264_dxva2",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_H264,

libavcodec/dxva2_mpeg2.c

@@ -260,7 +260,7 @@ static int end_frame(AVCodecContext *avctx)
                                      commit_bitstream_and_slice_buffer);
 }
 
-AVHWAccel mpeg2_dxva2_hwaccel = {
+AVHWAccel ff_mpeg2_dxva2_hwaccel = {
     .name           = "mpeg2_dxva2",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_MPEG2VIDEO,

libavcodec/dxva2_vc1.c

@@ -264,7 +264,7 @@ static int end_frame(AVCodecContext *avctx)
 }
 
 #if CONFIG_WMV3_DXVA2_HWACCEL
-AVHWAccel wmv3_dxva2_hwaccel = {
+AVHWAccel ff_wmv3_dxva2_hwaccel = {
     .name           = "wmv3_dxva2",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_WMV3,
@@ -277,7 +277,7 @@ AVHWAccel wmv3_dxva2_hwaccel = {
 };
 #endif
 
-AVHWAccel vc1_dxva2_hwaccel = {
+AVHWAccel ff_vc1_dxva2_hwaccel = {
     .name           = "vc1_dxva2",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_VC1,

libavcodec/vaapi_h264.c

@@ -334,7 +334,7 @@ static int decode_slice(AVCodecContext *avctx,
     return 0;
 }
 
-AVHWAccel h264_vaapi_hwaccel = {
+AVHWAccel ff_h264_vaapi_hwaccel = {
     .name           = "h264_vaapi",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_H264,

libavcodec/vaapi_mpeg2.c

@@ -138,7 +138,7 @@ static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer
     return 0;
 }
 
-AVHWAccel mpeg2_vaapi_hwaccel = {
+AVHWAccel ff_mpeg2_vaapi_hwaccel = {
     .name           = "mpeg2_vaapi",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_MPEG2VIDEO,

libavcodec/vaapi_mpeg4.c

@@ -150,7 +150,7 @@ static int vaapi_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer
 }
 
 #if CONFIG_MPEG4_VAAPI_HWACCEL
-AVHWAccel mpeg4_vaapi_hwaccel = {
+AVHWAccel ff_mpeg4_vaapi_hwaccel = {
     .name           = "mpeg4_vaapi",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_MPEG4,
@@ -164,7 +164,7 @@ AVHWAccel mpeg4_vaapi_hwaccel = {
 #endif
 
 #if CONFIG_H263_VAAPI_HWACCEL
-AVHWAccel h263_vaapi_hwaccel = {
+AVHWAccel ff_h263_vaapi_hwaccel = {
     .name           = "h263_vaapi",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_H263,

libavcodec/vaapi_vc1.c

@@ -326,7 +326,7 @@ static int vaapi_vc1_decode_slice(AVCodecContext *avctx, const uint8_t *buffer,
 }
 
 #if CONFIG_WMV3_VAAPI_HWACCEL
-AVHWAccel wmv3_vaapi_hwaccel = {
+AVHWAccel ff_wmv3_vaapi_hwaccel = {
     .name           = "wmv3_vaapi",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_WMV3,
@@ -339,7 +339,7 @@ AVHWAccel wmv3_vaapi_hwaccel = {
 };
 #endif
 
-AVHWAccel vc1_vaapi_hwaccel = {
+AVHWAccel ff_vc1_vaapi_hwaccel = {
     .name           = "vc1_vaapi",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_VC1,