libvpx: Pull from upstream

source/libvpx/vp9/decoder/vp9_dthread.c

Index: source/libvpx/vp9/decoder/vp9_dthread.c
diff --git a/source/libvpx/vp9/decoder/vp9_dthread.c b/source/libvpx/vp9/decoder/vp9_dthread.c
deleted file mode 100644
index 3d2d0dd2ea851517f32aa7bf82515b7797483c5d..0000000000000000000000000000000000000000
--- a/source/libvpx/vp9/decoder/vp9_dthread.c
+++ /dev/null
@@ -1,272 +0,0 @@
-/*
- *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "./vpx_config.h"
-
-#include "vpx_mem/vpx_mem.h"
-
-#include "vp9/common/vp9_reconinter.h"
-
-#include "vp9/decoder/vp9_dthread.h"
-#include "vp9/decoder/vp9_decoder.h"
-
-#if CONFIG_MULTITHREAD
-static INLINE void mutex_lock(pthread_mutex_t *const mutex) {
-  const int kMaxTryLocks = 4000;
-  int locked = 0;
-  int i;
-
-  for (i = 0; i < kMaxTryLocks; ++i) {
-    if (!pthread_mutex_trylock(mutex)) {
-      locked = 1;
-      break;
-    }
-  }
-
-  if (!locked)
-    pthread_mutex_lock(mutex);
-}
-#endif  // CONFIG_MULTITHREAD
-
-static INLINE void sync_read(VP9LfSync *const lf_sync, int r, int c) {
-#if CONFIG_MULTITHREAD
-  const int nsync = lf_sync->sync_range;
-
-  if (r && !(c & (nsync - 1))) {
-    pthread_mutex_t *const mutex = &lf_sync->mutex_[r - 1];
-    mutex_lock(mutex);
-
-    while (c > lf_sync->cur_sb_col[r - 1] - nsync) {
-      pthread_cond_wait(&lf_sync->cond_[r - 1], mutex);
-    }
-    pthread_mutex_unlock(mutex);
-  }
-#else
-  (void)lf_sync;
-  (void)r;
-  (void)c;
-#endif  // CONFIG_MULTITHREAD
-}
-
-static INLINE void sync_write(VP9LfSync *const lf_sync, int r, int c,
-                              const int sb_cols) {
-#if CONFIG_MULTITHREAD
-  const int nsync = lf_sync->sync_range;
-  int cur;
-  // Only signal when there are enough filtered SB for next row to run.
-  int sig = 1;
-
-  if (c < sb_cols - 1) {
-    cur = c;
-    if (c % nsync)
-      sig = 0;
-  } else {
-    cur = sb_cols + nsync;
-  }
-
-  if (sig) {
-    mutex_lock(&lf_sync->mutex_[r]);
-
-    lf_sync->cur_sb_col[r] = cur;
-
-    pthread_cond_signal(&lf_sync->cond_[r]);
-    pthread_mutex_unlock(&lf_sync->mutex_[r]);
-  }
-#else
-  (void)lf_sync;
-  (void)r;
-  (void)c;
-  (void)sb_cols;
-#endif  // CONFIG_MULTITHREAD
-}
-
-// Implement row loopfiltering for each thread.
-static void loop_filter_rows_mt(const YV12_BUFFER_CONFIG *const frame_buffer,
-                                VP9_COMMON *const cm,
-                                struct macroblockd_plane planes[MAX_MB_PLANE],
-                                int start, int stop, int y_only,
-                                VP9LfSync *const lf_sync) {
-  const int num_planes = y_only ? 1 : MAX_MB_PLANE;
-  int r, c;  // SB row and col
-  const int sb_cols = mi_cols_aligned_to_sb(cm->mi_cols) >> MI_BLOCK_SIZE_LOG2;
-
-  for (r = start; r < stop; r += lf_sync->num_workers) {
-    const int mi_row = r << MI_BLOCK_SIZE_LOG2;
-    MODE_INFO *const mi = cm->mi + mi_row * cm->mi_stride;
-
-    for (c = 0; c < sb_cols; ++c) {
-      const int mi_col = c << MI_BLOCK_SIZE_LOG2;
-      LOOP_FILTER_MASK lfm;
-      int plane;
-
-      sync_read(lf_sync, r, c);
-
-      vp9_setup_dst_planes(planes, frame_buffer, mi_row, mi_col);
-      vp9_setup_mask(cm, mi_row, mi_col, mi + mi_col, cm->mi_stride, &lfm);
-
-      for (plane = 0; plane < num_planes; ++plane) {
-        vp9_filter_block_plane(cm, &planes[plane], mi_row, &lfm);
-      }
-
-      sync_write(lf_sync, r, c, sb_cols);
-    }
-  }
-}
-
-// Row-based multi-threaded loopfilter hook
-static int loop_filter_row_worker(VP9LfSync *const lf_sync,
-                                  LFWorkerData *const lf_data) {
-  loop_filter_rows_mt(lf_data->frame_buffer, lf_data->cm, lf_data->planes,
-                      lf_data->start, lf_data->stop, lf_data->y_only, lf_sync);
-  return 1;
-}
-
-// VP9 decoder: Implement multi-threaded loopfilter that uses the tile
-// threads.
-void vp9_loop_filter_frame_mt(VP9LfSync *lf_sync,
-                              YV12_BUFFER_CONFIG *frame,
-                              struct macroblockd_plane planes[MAX_MB_PLANE],
-                              VP9_COMMON *cm,
-                              VP9Worker *workers, int nworkers,
-                              int frame_filter_level,
-                              int y_only) {
-  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;
-  const int tile_cols = 1 << cm->log2_tile_cols;
-  const int num_workers = MIN(nworkers, tile_cols);
-  int i;
-
-  if (!frame_filter_level) return;
-
-  if (!lf_sync->sync_range || cm->last_height != cm->height ||
-      num_workers > lf_sync->num_workers) {
-    vp9_loop_filter_dealloc(lf_sync);
-    vp9_loop_filter_alloc(lf_sync, cm, sb_rows, cm->width, num_workers);
-  }
-
-  vp9_loop_filter_frame_init(cm, frame_filter_level);
-
-  // Initialize cur_sb_col to -1 for all SB rows.
-  vpx_memset(lf_sync->cur_sb_col, -1, sizeof(*lf_sync->cur_sb_col) * sb_rows);
-
-  // Set up loopfilter thread data.
-  // The decoder is capping num_workers because it has been observed that using
-  // more threads on the loopfilter than there are cores will hurt performance
-  // on Android. This is because the system will only schedule the tile decode
-  // workers on cores equal to the number of tile columns. Then if the decoder
-  // tries to use more threads for the loopfilter, it will hurt performance
-  // because of contention. If the multithreading code changes in the future
-  // then the number of workers used by the loopfilter should be revisited.
-  for (i = 0; i < num_workers; ++i) {
-    VP9Worker *const worker = &workers[i];
-    LFWorkerData *const lf_data = &lf_sync->lfdata[i];
-
-    worker->hook = (VP9WorkerHook)loop_filter_row_worker;
-    worker->data1 = lf_sync;
-    worker->data2 = lf_data;
-
-    // Loopfilter data
-    vp9_loop_filter_data_reset(lf_data, frame, cm, planes);
-    lf_data->start = i;
-    lf_data->stop = sb_rows;
-    lf_data->y_only = y_only;
-
-    // Start loopfiltering
-    if (i == num_workers - 1) {
-      winterface->execute(worker);
-    } else {
-      winterface->launch(worker);
-    }
-  }
-
-  // Wait till all rows are finished
-  for (i = 0; i < num_workers; ++i) {
-    winterface->sync(&workers[i]);
-  }
-}
-
-// Set up nsync by width.
-static int get_sync_range(int width) {
-  // nsync numbers are picked by testing. For example, for 4k
-  // video, using 4 gives best performance.
-  if (width < 640)
-    return 1;
-  else if (width <= 1280)
-    return 2;
-  else if (width <= 4096)
-    return 4;
-  else
-    return 8;
-}
-
-// Allocate memory for lf row synchronization
-void vp9_loop_filter_alloc(VP9LfSync *lf_sync, VP9_COMMON *cm, int rows,
-                           int width, int num_workers) {
-  lf_sync->rows = rows;
-#if CONFIG_MULTITHREAD
-  {
-    int i;
-
-    CHECK_MEM_ERROR(cm, lf_sync->mutex_,
-                    vpx_malloc(sizeof(*lf_sync->mutex_) * rows));
-    if (lf_sync->mutex_) {
-      for (i = 0; i < rows; ++i) {
-        pthread_mutex_init(&lf_sync->mutex_[i], NULL);
-      }
-    }
-
-    CHECK_MEM_ERROR(cm, lf_sync->cond_,
-                    vpx_malloc(sizeof(*lf_sync->cond_) * rows));
-    if (lf_sync->cond_) {
-      for (i = 0; i < rows; ++i) {
-        pthread_cond_init(&lf_sync->cond_[i], NULL);
-      }
-    }
-  }
-#endif  // CONFIG_MULTITHREAD
-
-  CHECK_MEM_ERROR(cm, lf_sync->lfdata,
-                  vpx_malloc(num_workers * sizeof(*lf_sync->lfdata)));
-  lf_sync->num_workers = num_workers;
-
-  CHECK_MEM_ERROR(cm, lf_sync->cur_sb_col,
-                  vpx_malloc(sizeof(*lf_sync->cur_sb_col) * rows));
-
-  // Set up nsync.
-  lf_sync->sync_range = get_sync_range(width);
-}
-
-// Deallocate lf synchronization related mutex and data
-void vp9_loop_filter_dealloc(VP9LfSync *lf_sync) {
-  if (lf_sync != NULL) {
-#if CONFIG_MULTITHREAD
-    int i;
-
-    if (lf_sync->mutex_ != NULL) {
-      for (i = 0; i < lf_sync->rows; ++i) {
-        pthread_mutex_destroy(&lf_sync->mutex_[i]);
-      }
-      vpx_free(lf_sync->mutex_);
-    }
-    if (lf_sync->cond_ != NULL) {
-      for (i = 0; i < lf_sync->rows; ++i) {
-        pthread_cond_destroy(&lf_sync->cond_[i]);
-      }
-      vpx_free(lf_sync->cond_);
-    }
-#endif  // CONFIG_MULTITHREAD
-    vpx_free(lf_sync->lfdata);
-    vpx_free(lf_sync->cur_sb_col);
-    // clear the structure as the source of this call may be a resize in which
-    // case this call will be followed by an _alloc() which may fail.
-    vp9_zero(*lf_sync);
-  }
-}