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vp9_loop_filter_frame_mt: pass VP9LfSync directly

a step towards removing the pbi dependency

Change-Id: I10747b325e81c172f5e67031ea5159159fc26e91

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -1563,7 +1563,8 @@

     if (!xd->corrupted) {

       // If multiple threads are used to decode tiles, then we use those threads

       // to do parallel loopfiltering.

-      vp9_loop_filter_frame_mt(new_fb, pbi, cm, cm->lf.filter_level, 0);

+      vp9_loop_filter_frame_mt(&pbi->lf_row_sync, new_fb, pbi, cm,

+                               cm->lf.filter_level, 0);

     }

   } else {

     *p_data_end = decode_tiles(pbi, data + first_partition_size, data_end);

--- a/vp9/decoder/vp9_dthread.c

+++ b/vp9/decoder/vp9_dthread.c

@@ -133,11 +133,11 @@

 // VP9 decoder: Implement multi-threaded loopfilter that uses the tile

 // threads.

-void vp9_loop_filter_frame_mt(YV12_BUFFER_CONFIG *frame,

+void vp9_loop_filter_frame_mt(VP9LfSync *lf_sync,

+                              YV12_BUFFER_CONFIG *frame,

                               VP9Decoder *pbi, VP9_COMMON *cm,

                               int frame_filter_level,

                               int y_only) {

-  VP9LfSync *const lf_sync = &pbi->lf_row_sync;

   const VP9WorkerInterface *const winterface = vp9_get_worker_interface();

   // Number of superblock rows and cols

   const int sb_rows = mi_cols_aligned_to_sb(cm->mi_rows) >> MI_BLOCK_SIZE_LOG2;

--- a/vp9/decoder/vp9_dthread.h

+++ b/vp9/decoder/vp9_dthread.h

@@ -49,7 +49,8 @@

 void vp9_loop_filter_dealloc(VP9LfSync *lf_sync);

 // Multi-threaded loopfilter that uses the tile threads.

-void vp9_loop_filter_frame_mt(YV12_BUFFER_CONFIG *frame,

+void vp9_loop_filter_frame_mt(VP9LfSync *lf_sync,

+                              YV12_BUFFER_CONFIG *frame,

                               struct VP9Decoder *pbi,

                               struct VP9Common *cm,

                               int frame_filter_level,