Add ff_hwaccel_pixfmt_list_420[] definition.

Patch by Gwenole Beauchesne.

Originally committed as revision 17633 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo.c

@@ -80,6 +80,11 @@ const enum PixelFormat ff_pixfmt_list_420[] = {
     PIX_FMT_NONE
 };
 
+const enum PixelFormat ff_hwaccel_pixfmt_list_420[] = {
+    PIX_FMT_YUV420P,
+    PIX_FMT_NONE
+};
+
 const uint8_t *ff_find_start_code(const uint8_t * restrict p, const uint8_t *end, uint32_t * restrict state){
     int i;
 

libavcodec/mpegvideo.h

@@ -709,6 +709,7 @@ void ff_init_block_index(MpegEncContext *s);
 void ff_copy_picture(Picture *dst, Picture *src);
 
 extern const enum PixelFormat ff_pixfmt_list_420[];
+extern const enum PixelFormat ff_hwaccel_pixfmt_list_420[];
 
 static inline void ff_update_block_index(MpegEncContext *s){
     const int block_size= 8>>s->avctx->lowres;