Update VA API pixfmts documentation: struct vaapi_render_state

shall now be copied to Picture.data[3].

Originally committed as revision 17912 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/pixfmt.h

@@ -106,9 +106,9 @@ enum PixelFormat {
     PIX_FMT_VDPAU_VC1, ///< VC-1 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
     PIX_FMT_RGB48BE,   ///< packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, big-endian
     PIX_FMT_RGB48LE,   ///< packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, little-endian
-    PIX_FMT_VAAPI_MOCO, ///< HW acceleration through VA API at motion compensation entry-point, Picture.data[0] contains a vaapi_render_state struct which contains macroblocks as well as various fields extracted from headers
-    PIX_FMT_VAAPI_IDCT, ///< HW acceleration through VA API at IDCT entry-point, Picture.data[0] contains a vaapi_render_state struct which contains fields extracted from headers
-    PIX_FMT_VAAPI_VLD,  ///< HW decoding through VA API, Picture.data[0] contains a vaapi_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
+    PIX_FMT_VAAPI_MOCO, ///< HW acceleration through VA API at motion compensation entry-point, Picture.data[3] contains a vaapi_render_state struct which contains macroblocks as well as various fields extracted from headers
+    PIX_FMT_VAAPI_IDCT, ///< HW acceleration through VA API at IDCT entry-point, Picture.data[3] contains a vaapi_render_state struct which contains fields extracted from headers
+    PIX_FMT_VAAPI_VLD,  ///< HW decoding through VA API, Picture.data[3] contains a vaapi_render_state struct which contains the bitstream of the slices as well as various fields extracted from headers
     PIX_FMT_NB,        ///< number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of formats might differ between versions
 };