Merge changes from topic 'rm-dec-frame-parallel'

* changes:
  vp9: remove FrameWorkerData & vp9_dthread.h
  vp9: remove (un)lock_buffer_pool

10 files changed, 80 insertions, 345 deletions

diff --git a/vp9/common/vp9_alloccommon.c b/vp9/common/vp9_alloccommon.c
index 2fd8c7d5a..c9aca89d1 100644
--- a/vp9/common/vp9_alloccommon.c
+++ b/vp9/common/vp9_alloccommon.c
@@ -17,24 +17,6 @@
 #include "vp9/common/vp9_entropymv.h"
 #include "vp9/common/vp9_onyxc_int.h"
 
-// TODO(hkuang): Don't need to lock the whole pool after implementing atomic
-// frame reference count.
-void lock_buffer_pool(BufferPool *const pool) {
-#if CONFIG_MULTITHREAD
-  pthread_mutex_lock(&pool->pool_mutex);
-#else
-  (void)pool;
-#endif
-}
-
-void unlock_buffer_pool(BufferPool *const pool) {
-#if CONFIG_MULTITHREAD
-  pthread_mutex_unlock(&pool->pool_mutex);
-#else
-  (void)pool;
-#endif
-}
-
 void vp9_set_mb_mi(VP9_COMMON *cm, int width, int height) {
   const int aligned_width = ALIGN_POWER_OF_TWO(width, MI_SIZE_LOG2);
   const int aligned_height = ALIGN_POWER_OF_TWO(height, MI_SIZE_LOG2);
@@ -172,6 +154,9 @@ fail:
 }
 
 void vp9_remove_common(VP9_COMMON *cm) {
+#if CONFIG_VP9_POSTPROC
+  vp9_free_postproc_buffers(cm);
+#endif
   vp9_free_context_buffers(cm);
 
   vpx_free(cm->fc);
diff --git a/vp9/common/vp9_onyxc_int.h b/vp9/common/vp9_onyxc_int.h
index be0dbee34..5dc7b9de5 100644
--- a/vp9/common/vp9_onyxc_int.h
+++ b/vp9/common/vp9_onyxc_int.h
@@ -74,13 +74,6 @@ typedef struct {
 } RefCntBuffer;
 
 typedef struct BufferPool {
-// Protect BufferPool from being accessed by several FrameWorkers at
-// the same time during frame parallel decode.
-// TODO(hkuang): Try to use atomic variable instead of locking the whole pool.
-#if CONFIG_MULTITHREAD
-  pthread_mutex_t pool_mutex;
-#endif
-
   // Private data associated with the frame buffer callbacks.
   void *cb_priv;
 
@@ -264,11 +257,6 @@ typedef struct VP9Common {
   int above_context_alloc_cols;
 } VP9_COMMON;
 
-// TODO(hkuang): Don't need to lock the whole pool after implementing atomic
-// frame reference count.
-void lock_buffer_pool(BufferPool *const pool);
-void unlock_buffer_pool(BufferPool *const pool);
-
 static INLINE YV12_BUFFER_CONFIG *get_ref_frame(VP9_COMMON *cm, int index) {
   if (index < 0 || index >= REF_FRAMES) return NULL;
   if (cm->ref_frame_map[index] < 0) return NULL;
@@ -284,7 +272,6 @@ static INLINE int get_free_fb(VP9_COMMON *cm) {
   RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
   int i;
 
-  lock_buffer_pool(cm->buffer_pool);
   for (i = 0; i < FRAME_BUFFERS; ++i)
     if (frame_bufs[i].ref_count == 0) break;
 
@@ -295,7 +282,6 @@ static INLINE int get_free_fb(VP9_COMMON *cm) {
     i = INVALID_IDX;
   }
 
-  unlock_buffer_pool(cm->buffer_pool);
   return i;
 }
 
diff --git a/vp9/decoder/vp9_decodeframe.c b/vp9/decoder/vp9_decodeframe.c
index d427b1251..0e4605abb 100644
--- a/vp9/decoder/vp9_decodeframe.c
+++ b/vp9/decoder/vp9_decodeframe.c
@@ -1171,7 +1171,6 @@ static void setup_frame_size(VP9_COMMON *cm, struct vpx_read_bit_buffer *rb) {
   resize_context_buffers(cm, width, height);
   setup_render_size(cm, rb);
 
-  lock_buffer_pool(pool);
   if (vpx_realloc_frame_buffer(
           get_frame_new_buffer(cm), cm->width, cm->height, cm->subsampling_x,
           cm->subsampling_y,
@@ -1181,11 +1180,9 @@ static void setup_frame_size(VP9_COMMON *cm, struct vpx_read_bit_buffer *rb) {
           VP9_DEC_BORDER_IN_PIXELS, cm->byte_alignment,
           &pool->frame_bufs[cm->new_fb_idx].raw_frame_buffer, pool->get_fb_cb,
           pool->cb_priv)) {
-    unlock_buffer_pool(pool);
     vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                        "Failed to allocate frame buffer");
   }
-  unlock_buffer_pool(pool);
 
   pool->frame_bufs[cm->new_fb_idx].buf.subsampling_x = cm->subsampling_x;
   pool->frame_bufs[cm->new_fb_idx].buf.subsampling_y = cm->subsampling_y;
@@ -1257,7 +1254,6 @@ static void setup_frame_size_with_refs(VP9_COMMON *cm,
   resize_context_buffers(cm, width, height);
   setup_render_size(cm, rb);
 
-  lock_buffer_pool(pool);
   if (vpx_realloc_frame_buffer(
           get_frame_new_buffer(cm), cm->width, cm->height, cm->subsampling_x,
           cm->subsampling_y,
@@ -1267,11 +1263,9 @@ static void setup_frame_size_with_refs(VP9_COMMON *cm,
           VP9_DEC_BORDER_IN_PIXELS, cm->byte_alignment,
           &pool->frame_bufs[cm->new_fb_idx].raw_frame_buffer, pool->get_fb_cb,
           pool->cb_priv)) {
-    unlock_buffer_pool(pool);
     vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                        "Failed to allocate frame buffer");
   }
-  unlock_buffer_pool(pool);
 
   pool->frame_bufs[cm->new_fb_idx].buf.subsampling_x = cm->subsampling_x;
   pool->frame_bufs[cm->new_fb_idx].buf.subsampling_y = cm->subsampling_y;
@@ -1756,16 +1750,13 @@ static size_t read_uncompressed_header(VP9Decoder *pbi,
   if (cm->show_existing_frame) {
     // Show an existing frame directly.
     const int frame_to_show = cm->ref_frame_map[vpx_rb_read_literal(rb, 3)];
-    lock_buffer_pool(pool);
     if (frame_to_show < 0 || frame_bufs[frame_to_show].ref_count < 1) {
-      unlock_buffer_pool(pool);
       vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
                          "Buffer %d does not contain a decoded frame",
                          frame_to_show);
     }
 
     ref_cnt_fb(frame_bufs, &cm->new_fb_idx, frame_to_show);
-    unlock_buffer_pool(pool);
     pbi->refresh_frame_flags = 0;
     cm->lf.filter_level = 0;
     cm->show_frame = 1;
@@ -1886,7 +1877,6 @@ static size_t read_uncompressed_header(VP9Decoder *pbi,
   cm->frame_context_idx = vpx_rb_read_literal(rb, FRAME_CONTEXTS_LOG2);
 
   // Generate next_ref_frame_map.
-  lock_buffer_pool(pool);
   for (mask = pbi->refresh_frame_flags; mask; mask >>= 1) {
     if (mask & 1) {
       cm->next_ref_frame_map[ref_index] = cm->new_fb_idx;
@@ -1906,7 +1896,6 @@ static size_t read_uncompressed_header(VP9Decoder *pbi,
     if (cm->ref_frame_map[ref_index] >= 0)
       ++frame_bufs[cm->ref_frame_map[ref_index]].ref_count;
   }
-  unlock_buffer_pool(pool);
   pbi->hold_ref_buf = 1;
 
   if (frame_is_intra_only(cm) || cm->error_resilient_mode)
diff --git a/vp9/decoder/vp9_decoder.c b/vp9/decoder/vp9_decoder.c
index 540b32344..6adbee78f 100644
--- a/vp9/decoder/vp9_decoder.c
+++ b/vp9/decoder/vp9_decoder.c
@@ -139,6 +139,7 @@ void vp9_decoder_remove(VP9Decoder *pbi) {
     vp9_loop_filter_dealloc(&pbi->lf_row_sync);
   }
 
+  vp9_remove_common(&pbi->common);
   vpx_free(pbi);
 }
 
@@ -230,7 +231,6 @@ static void swap_frame_buffers(VP9Decoder *pbi) {
   BufferPool *const pool = cm->buffer_pool;
   RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
 
-  lock_buffer_pool(pool);
   for (mask = pbi->refresh_frame_flags; mask; mask >>= 1) {
     const int old_idx = cm->ref_frame_map[ref_index];
     // Current thread releases the holding of reference frame.
@@ -250,13 +250,10 @@ static void swap_frame_buffers(VP9Decoder *pbi) {
     decrease_ref_count(old_idx, frame_bufs, pool);
     cm->ref_frame_map[ref_index] = cm->next_ref_frame_map[ref_index];
   }
-  unlock_buffer_pool(pool);
   pbi->hold_ref_buf = 0;
   cm->frame_to_show = get_frame_new_buffer(cm);
 
-  lock_buffer_pool(pool);
   --frame_bufs[cm->new_fb_idx].ref_count;
-  unlock_buffer_pool(pool);
 
   // Invalidate these references until the next frame starts.
   for (ref_index = 0; ref_index < 3; ref_index++)
@@ -321,7 +318,6 @@ int vp9_receive_compressed_data(VP9Decoder *pbi, size_t size,
       winterface->sync(&pbi->tile_workers[i]);
     }
 
-    lock_buffer_pool(pool);
     // Release all the reference buffers if worker thread is holding them.
     if (pbi->hold_ref_buf == 1) {
       int ref_index = 0, mask;
@@ -346,7 +342,6 @@ int vp9_receive_compressed_data(VP9Decoder *pbi, size_t size,
     }
     // Release current frame.
     decrease_ref_count(cm->new_fb_idx, frame_bufs, pool);
-    unlock_buffer_pool(pool);
 
     vpx_clear_system_state();
     return -1;
diff --git a/vp9/decoder/vp9_decoder.h b/vp9/decoder/vp9_decoder.h
index ed0fd82dc..2040cee81 100644
--- a/vp9/decoder/vp9_decoder.h
+++ b/vp9/decoder/vp9_decoder.h
@@ -21,7 +21,6 @@
 #include "vp9/common/vp9_thread_common.h"
 #include "vp9/common/vp9_onyxc_int.h"
 #include "vp9/common/vp9_ppflags.h"
-#include "vp9/decoder/vp9_dthread.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/vp9/decoder/vp9_dthread.h b/vp9/decoder/vp9_dthread.h
deleted file mode 100644
index 9e944f973..000000000
--- a/vp9/decoder/vp9_dthread.h
+++ /dev/null
@@ -1,55 +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.
- */
-
-#ifndef VP9_DECODER_VP9_DTHREAD_H_
-#define VP9_DECODER_VP9_DTHREAD_H_
-
-#include "./vpx_config.h"
-#include "vpx_util/vpx_thread.h"
-#include "vpx/internal/vpx_codec_internal.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct VP9Common;
-struct VP9Decoder;
-
-// WorkerData for the FrameWorker thread. It contains all the information of
-// the worker and decode structures for decoding a frame.
-typedef struct FrameWorkerData {
-  struct VP9Decoder *pbi;
-  const uint8_t *data;
-  const uint8_t *data_end;
-  size_t data_size;
-  void *user_priv;
-  int result;
-  int worker_id;
-  int received_frame;
-
-  // scratch_buffer is used in frame parallel mode only.
-  // It is used to make a copy of the compressed data.
-  uint8_t *scratch_buffer;
-  size_t scratch_buffer_size;
-
-#if CONFIG_MULTITHREAD
-  pthread_mutex_t stats_mutex;
-  pthread_cond_t stats_cond;
-#endif
-
-  int frame_context_ready;  // Current frame's context is ready to read.
-  int frame_decoded;        // Finished decoding current frame.
-} FrameWorkerData;
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
-
-#endif  // VP9_DECODER_VP9_DTHREAD_H_
diff --git a/vp9/vp9_cx_iface.c b/vp9/vp9_cx_iface.c
index d18457f34..64ce1c0ef 100644
--- a/vp9/vp9_cx_iface.c
+++ b/vp9/vp9_cx_iface.c
@@ -898,12 +898,6 @@ static vpx_codec_err_t encoder_init(vpx_codec_ctx_t *ctx,
     priv->buffer_pool = (BufferPool *)vpx_calloc(1, sizeof(BufferPool));
     if (priv->buffer_pool == NULL) return VPX_CODEC_MEM_ERROR;
 
-#if CONFIG_MULTITHREAD
-    if (pthread_mutex_init(&priv->buffer_pool->pool_mutex, NULL)) {
-      return VPX_CODEC_MEM_ERROR;
-    }
-#endif
-
     if (ctx->config.enc) {
       // Update the reference to the config structure to an internal copy.
       priv->cfg = *ctx->config.enc;
@@ -935,9 +929,6 @@ static vpx_codec_err_t encoder_init(vpx_codec_ctx_t *ctx,
 static vpx_codec_err_t encoder_destroy(vpx_codec_alg_priv_t *ctx) {
   free(ctx->cx_data);
   vp9_remove_compressor(ctx->cpi);
-#if CONFIG_MULTITHREAD
-  pthread_mutex_destroy(&ctx->buffer_pool->pool_mutex);
-#endif
   vpx_free(ctx->buffer_pool);
   vpx_free(ctx);
   return VPX_CODEC_OK;
diff --git a/vp9/vp9_dx_iface.c b/vp9/vp9_dx_iface.c
index 35070d6f5..b7dc14e4b 100644
--- a/vp9/vp9_dx_iface.c
+++ b/vp9/vp9_dx_iface.c
@@ -57,33 +57,8 @@ static vpx_codec_err_t decoder_init(vpx_codec_ctx_t *ctx,
 }
 
 static vpx_codec_err_t decoder_destroy(vpx_codec_alg_priv_t *ctx) {
-  if (ctx->frame_workers != NULL) {
-    int i;
-    // Shutdown all threads before reclaiming any memory. The frame-level
-    // parallel decoder may access data from another worker.
-    for (i = 0; i < ctx->num_frame_workers; ++i) {
-      VPxWorker *const worker = &ctx->frame_workers[i];
-      vpx_get_worker_interface()->end(worker);
-    }
-    for (i = 0; i < ctx->num_frame_workers; ++i) {
-      VPxWorker *const worker = &ctx->frame_workers[i];
-      FrameWorkerData *const frame_worker_data =
-          (FrameWorkerData *)worker->data1;
-      vp9_remove_common(&frame_worker_data->pbi->common);
-#if CONFIG_VP9_POSTPROC
-      vp9_free_postproc_buffers(&frame_worker_data->pbi->common);
-#endif
-      vp9_decoder_remove(frame_worker_data->pbi);
-      vpx_free(frame_worker_data->scratch_buffer);
-#if CONFIG_MULTITHREAD
-      pthread_mutex_destroy(&frame_worker_data->stats_mutex);
-      pthread_cond_destroy(&frame_worker_data->stats_cond);
-#endif
-      vpx_free(frame_worker_data);
-    }
-#if CONFIG_MULTITHREAD
-    pthread_mutex_destroy(&ctx->buffer_pool->pool_mutex);
-#endif
+  if (ctx->pbi != NULL) {
+    vp9_decoder_remove(ctx->pbi);
   }
 
   if (ctx->buffer_pool) {
@@ -91,7 +66,6 @@ static vpx_codec_err_t decoder_destroy(vpx_codec_alg_priv_t *ctx) {
     vp9_free_internal_frame_buffers(&ctx->buffer_pool->int_frame_buffers);
   }
 
-  vpx_free(ctx->frame_workers);
   vpx_free(ctx->buffer_pool);
   vpx_free(ctx);
   return VPX_CODEC_OK;
@@ -225,32 +199,26 @@ static vpx_codec_err_t update_error_state(
 }
 
 static void init_buffer_callbacks(vpx_codec_alg_priv_t *ctx) {
-  int i;
-
-  for (i = 0; i < ctx->num_frame_workers; ++i) {
-    VPxWorker *const worker = &ctx->frame_workers[i];
-    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
-    VP9_COMMON *const cm = &frame_worker_data->pbi->common;
-    BufferPool *const pool = cm->buffer_pool;
-
-    cm->new_fb_idx = INVALID_IDX;
-    cm->byte_alignment = ctx->byte_alignment;
-    cm->skip_loop_filter = ctx->skip_loop_filter;
-
-    if (ctx->get_ext_fb_cb != NULL && ctx->release_ext_fb_cb != NULL) {
-      pool->get_fb_cb = ctx->get_ext_fb_cb;
-      pool->release_fb_cb = ctx->release_ext_fb_cb;
-      pool->cb_priv = ctx->ext_priv;
-    } else {
-      pool->get_fb_cb = vp9_get_frame_buffer;
-      pool->release_fb_cb = vp9_release_frame_buffer;
+  VP9_COMMON *const cm = &ctx->pbi->common;
+  BufferPool *const pool = cm->buffer_pool;
 
-      if (vp9_alloc_internal_frame_buffers(&pool->int_frame_buffers))
-        vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
-                           "Failed to initialize internal frame buffers");
+  cm->new_fb_idx = INVALID_IDX;
+  cm->byte_alignment = ctx->byte_alignment;
+  cm->skip_loop_filter = ctx->skip_loop_filter;
 
-      pool->cb_priv = &pool->int_frame_buffers;
-    }
+  if (ctx->get_ext_fb_cb != NULL && ctx->release_ext_fb_cb != NULL) {
+    pool->get_fb_cb = ctx->get_ext_fb_cb;
+    pool->release_fb_cb = ctx->release_ext_fb_cb;
+    pool->cb_priv = ctx->ext_priv;
+  } else {
+    pool->get_fb_cb = vp9_get_frame_buffer;
+    pool->release_fb_cb = vp9_release_frame_buffer;
+
+    if (vp9_alloc_internal_frame_buffers(&pool->int_frame_buffers))
+      vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
+                         "Failed to initialize internal frame buffers");
+
+    pool->cb_priv = &pool->int_frame_buffers;
   }
 }
 
@@ -267,87 +235,21 @@ static void set_ppflags(const vpx_codec_alg_priv_t *ctx, vp9_ppflags_t *flags) {
   flags->noise_level = ctx->postproc_cfg.noise_level;
 }
 
-static int frame_worker_hook(void *arg1, void *arg2) {
-  FrameWorkerData *const frame_worker_data = (FrameWorkerData *)arg1;
-  const uint8_t *data = frame_worker_data->data;
-  (void)arg2;
-
-  frame_worker_data->result = vp9_receive_compressed_data(
-      frame_worker_data->pbi, frame_worker_data->data_size, &data);
-  frame_worker_data->data_end = data;
-
-  if (frame_worker_data->result != 0) {
-    // Check decode result in serial decode.
-    frame_worker_data->pbi->cur_buf->buf.corrupted = 1;
-    frame_worker_data->pbi->need_resync = 1;
-  }
-  return !frame_worker_data->result;
-}
-
 static vpx_codec_err_t init_decoder(vpx_codec_alg_priv_t *ctx) {
-  int i;
-  const VPxWorkerInterface *const winterface = vpx_get_worker_interface();
-
   ctx->last_show_frame = -1;
   ctx->need_resync = 1;
-  ctx->num_frame_workers = 1;
   ctx->flushed = 0;
 
   ctx->buffer_pool = (BufferPool *)vpx_calloc(1, sizeof(BufferPool));
   if (ctx->buffer_pool == NULL) return VPX_CODEC_MEM_ERROR;
 
-#if CONFIG_MULTITHREAD
-  if (pthread_mutex_init(&ctx->buffer_pool->pool_mutex, NULL)) {
-    set_error_detail(ctx, "Failed to allocate buffer pool mutex");
+  ctx->pbi = vp9_decoder_create(ctx->buffer_pool);
+  if (ctx->pbi == NULL) {
+    set_error_detail(ctx, "Failed to allocate decoder");
     return VPX_CODEC_MEM_ERROR;
   }
-#endif
-
-  ctx->frame_workers = (VPxWorker *)vpx_malloc(ctx->num_frame_workers *
-                                               sizeof(*ctx->frame_workers));
-  if (ctx->frame_workers == NULL) {
-    set_error_detail(ctx, "Failed to allocate frame_workers");
-    return VPX_CODEC_MEM_ERROR;
-  }
-
-  for (i = 0; i < ctx->num_frame_workers; ++i) {
-    VPxWorker *const worker = &ctx->frame_workers[i];
-    FrameWorkerData *frame_worker_data = NULL;
-    winterface->init(worker);
-    worker->data1 = vpx_memalign(32, sizeof(FrameWorkerData));
-    if (worker->data1 == NULL) {
-      set_error_detail(ctx, "Failed to allocate frame_worker_data");
-      return VPX_CODEC_MEM_ERROR;
-    }
-    frame_worker_data = (FrameWorkerData *)worker->data1;
-    frame_worker_data->pbi = vp9_decoder_create(ctx->buffer_pool);
-    if (frame_worker_data->pbi == NULL) {
-      set_error_detail(ctx, "Failed to allocate frame_worker_data");
-      return VPX_CODEC_MEM_ERROR;
-    }
-    frame_worker_data->worker_id = i;
-    frame_worker_data->scratch_buffer = NULL;
-    frame_worker_data->scratch_buffer_size = 0;
-    frame_worker_data->frame_context_ready = 0;
-    frame_worker_data->received_frame = 0;
-#if CONFIG_MULTITHREAD
-    if (pthread_mutex_init(&frame_worker_data->stats_mutex, NULL)) {
-      set_error_detail(ctx, "Failed to allocate frame_worker_data mutex");
-      return VPX_CODEC_MEM_ERROR;
-    }
-
-    if (pthread_cond_init(&frame_worker_data->stats_cond, NULL)) {
-      set_error_detail(ctx, "Failed to allocate frame_worker_data cond");
-      return VPX_CODEC_MEM_ERROR;
-    }
-#endif
-    // If decoding in serial mode, FrameWorker thread could create tile worker
-    // thread or loopfilter thread.
-    frame_worker_data->pbi->max_threads = ctx->cfg.threads;
-
-    frame_worker_data->pbi->inv_tile_order = ctx->invert_tile_order;
-    worker->hook = (VPxWorkerHook)frame_worker_hook;
-  }
+  ctx->pbi->max_threads = ctx->cfg.threads;
+  ctx->pbi->inv_tile_order = ctx->invert_tile_order;
 
   // If postprocessing was enabled by the application and a
   // configuration has not been provided, default it.
@@ -361,7 +263,7 @@ static vpx_codec_err_t init_decoder(vpx_codec_alg_priv_t *ctx) {
 
 static INLINE void check_resync(vpx_codec_alg_priv_t *const ctx,
                                 const VP9Decoder *const pbi) {
-  // Clear resync flag if worker got a key frame or intra only frame.
+  // Clear resync flag if the decoder got a key frame or intra only frame.
   if (ctx->need_resync == 1 && pbi->need_resync == 0 &&
       (pbi->common.intra_only || pbi->common.frame_type == KEY_FRAME))
     ctx->need_resync = 0;
@@ -370,7 +272,6 @@ static INLINE void check_resync(vpx_codec_alg_priv_t *const ctx,
 static vpx_codec_err_t decode_one(vpx_codec_alg_priv_t *ctx,
                                   const uint8_t **data, unsigned int data_sz,
                                   void *user_priv, int64_t deadline) {
-  const VPxWorkerInterface *const winterface = vpx_get_worker_interface();
   (void)deadline;
 
   // Determine the stream parameters. Note that we rely on peek_si to
@@ -386,31 +287,22 @@ static vpx_codec_err_t decode_one(vpx_codec_alg_priv_t *ctx,
     if (!ctx->si.is_kf && !is_intra_only) return VPX_CODEC_ERROR;
   }
 
-  {
-    VPxWorker *const worker = ctx->frame_workers;
-    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
-    frame_worker_data->data = *data;
-    frame_worker_data->data_size = data_sz;
-    frame_worker_data->user_priv = user_priv;
-    frame_worker_data->received_frame = 1;
-
-    // Set these even if already initialized.  The caller may have changed the
-    // decrypt config between frames.
-    frame_worker_data->pbi->decrypt_cb = ctx->decrypt_cb;
-    frame_worker_data->pbi->decrypt_state = ctx->decrypt_state;
-
-    worker->had_error = 0;
-    winterface->execute(worker);
-
-    // Update data pointer after decode.
-    *data = frame_worker_data->data_end;
+  ctx->user_priv = user_priv;
 
-    if (worker->had_error)
-      return update_error_state(ctx, &frame_worker_data->pbi->common.error);
+  // Set these even if already initialized.  The caller may have changed the
+  // decrypt config between frames.
+  ctx->pbi->decrypt_cb = ctx->decrypt_cb;
+  ctx->pbi->decrypt_state = ctx->decrypt_state;
 
-    check_resync(ctx, frame_worker_data->pbi);
+  if (vp9_receive_compressed_data(ctx->pbi, data_sz, data)) {
+    ctx->pbi->cur_buf->buf.corrupted = 1;
+    ctx->pbi->need_resync = 1;
+    ctx->need_resync = 1;
+    return update_error_state(ctx, &ctx->pbi->common.error);
   }
 
+  check_resync(ctx, ctx->pbi);
+
   return VPX_CODEC_OK;
 }
 
@@ -431,8 +323,8 @@ static vpx_codec_err_t decoder_decode(vpx_codec_alg_priv_t *ctx,
   // Reset flushed when receiving a valid frame.
   ctx->flushed = 0;
 
-  // Initialize the decoder workers on the first frame.
-  if (ctx->frame_workers == NULL) {
+  // Initialize the decoder on the first frame.
+  if (ctx->pbi == NULL) {
     const vpx_codec_err_t res = init_decoder(ctx);
     if (res != VPX_CODEC_OK) return res;
   }
@@ -488,35 +380,19 @@ static vpx_image_t *decoder_get_frame(vpx_codec_alg_priv_t *ctx,
 
   // iter acts as a flip flop, so an image is only returned on the first
   // call to get_frame.
-  if (*iter == NULL && ctx->frame_workers != NULL) {
+  if (*iter == NULL && ctx->pbi != NULL) {
     YV12_BUFFER_CONFIG sd;
     vp9_ppflags_t flags = { 0, 0, 0 };
-    const VPxWorkerInterface *const winterface = vpx_get_worker_interface();
-    VPxWorker *const worker = &ctx->frame_workers[0];
-    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
     if (ctx->base.init_flags & VPX_CODEC_USE_POSTPROC) set_ppflags(ctx, &flags);
-    // Wait for the frame from worker thread.
-    if (winterface->sync(worker)) {
-      // Check if worker has received any frames.
-      if (frame_worker_data->received_frame == 1) {
-        frame_worker_data->received_frame = 0;
-        check_resync(ctx, frame_worker_data->pbi);
-      }
-      if (vp9_get_raw_frame(frame_worker_data->pbi, &sd, &flags) == 0) {
-        VP9_COMMON *const cm = &frame_worker_data->pbi->common;
-        RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
-        ctx->last_show_frame = frame_worker_data->pbi->common.new_fb_idx;
-        if (ctx->need_resync) return NULL;
-        yuvconfig2image(&ctx->img, &sd, frame_worker_data->user_priv);
-        ctx->img.fb_priv = frame_bufs[cm->new_fb_idx].raw_frame_buffer.priv;
-        img = &ctx->img;
-        return img;
-      }
-    } else {
-      // Decoding failed. Release the worker thread.
-      frame_worker_data->received_frame = 0;
-      ctx->need_resync = 1;
-      if (ctx->flushed != 1) return NULL;
+    if (vp9_get_raw_frame(ctx->pbi, &sd, &flags) == 0) {
+      VP9_COMMON *const cm = &ctx->pbi->common;
+      RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
+      ctx->last_show_frame = ctx->pbi->common.new_fb_idx;
+      if (ctx->need_resync) return NULL;
+      yuvconfig2image(&ctx->img, &sd, ctx->user_priv);
+      ctx->img.fb_priv = frame_bufs[cm->new_fb_idx].raw_frame_buffer.priv;
+      img = &ctx->img;
+      return img;
     }
   }
   return NULL;
@@ -527,7 +403,7 @@ static vpx_codec_err_t decoder_set_fb_fn(
     vpx_release_frame_buffer_cb_fn_t cb_release, void *cb_priv) {
   if (cb_get == NULL || cb_release == NULL) {
     return VPX_CODEC_INVALID_PARAM;
-  } else if (ctx->frame_workers == NULL) {
+  } else if (ctx->pbi == NULL) {
     // If the decoder has already been initialized, do not accept changes to
     // the frame buffer functions.
     ctx->get_ext_fb_cb = cb_get;
@@ -546,12 +422,9 @@ static vpx_codec_err_t ctrl_set_reference(vpx_codec_alg_priv_t *ctx,
   if (data) {
     vpx_ref_frame_t *const frame = (vpx_ref_frame_t *)data;
     YV12_BUFFER_CONFIG sd;
-    VPxWorker *const worker = ctx->frame_workers;
-    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
     image2yuvconfig(&frame->img, &sd);
-    return vp9_set_reference_dec(&frame_worker_data->pbi->common,
-                                 ref_frame_to_vp9_reframe(frame->frame_type),
-                                 &sd);
+    return vp9_set_reference_dec(
+        &ctx->pbi->common, ref_frame_to_vp9_reframe(frame->frame_type), &sd);
   } else {
     return VPX_CODEC_INVALID_PARAM;
   }
@@ -564,11 +437,9 @@ static vpx_codec_err_t ctrl_copy_reference(vpx_codec_alg_priv_t *ctx,
   if (data) {
     vpx_ref_frame_t *frame = (vpx_ref_frame_t *)data;
     YV12_BUFFER_CONFIG sd;
-    VPxWorker *const worker = ctx->frame_workers;
-    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
     image2yuvconfig(&frame->img, &sd);
-    return vp9_copy_reference_dec(frame_worker_data->pbi,
-                                  (VP9_REFFRAME)frame->frame_type, &sd);
+    return vp9_copy_reference_dec(ctx->pbi, (VP9_REFFRAME)frame->frame_type,
+                                  &sd);
   } else {
     return VPX_CODEC_INVALID_PARAM;
   }
@@ -580,9 +451,7 @@ static vpx_codec_err_t ctrl_get_reference(vpx_codec_alg_priv_t *ctx,
 
   if (data) {
     YV12_BUFFER_CONFIG *fb;
-    VPxWorker *const worker = ctx->frame_workers;
-    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
-    fb = get_ref_frame(&frame_worker_data->pbi->common, data->idx);
+    fb = get_ref_frame(&ctx->pbi->common, data->idx);
     if (fb == NULL) return VPX_CODEC_ERROR;
     yuvconfig2image(&data->img, fb, NULL);
     return VPX_CODEC_OK;
@@ -613,9 +482,8 @@ static vpx_codec_err_t ctrl_set_postproc(vpx_codec_alg_priv_t *ctx,
 static vpx_codec_err_t ctrl_get_quantizer(vpx_codec_alg_priv_t *ctx,
                                           va_list args) {
   int *const arg = va_arg(args, int *);
-  if (arg == NULL) return VPX_CODEC_INVALID_PARAM;
-  *arg =
-      ((FrameWorkerData *)ctx->frame_workers[0].data1)->pbi->common.base_qindex;
+  if (arg == NULL || ctx->pbi == NULL) return VPX_CODEC_INVALID_PARAM;
+  *arg = ctx->pbi->common.base_qindex;
   return VPX_CODEC_OK;
 }
 
@@ -624,11 +492,8 @@ static vpx_codec_err_t ctrl_get_last_ref_updates(vpx_codec_alg_priv_t *ctx,
   int *const update_info = va_arg(args, int *);
 
   if (update_info) {
-    if (ctx->frame_workers) {
-      VPxWorker *const worker = ctx->frame_workers;
-      FrameWorkerData *const frame_worker_data =
-          (FrameWorkerData *)worker->data1;
-      *update_info = frame_worker_data->pbi->refresh_frame_flags;
+    if (ctx->pbi != NULL) {
+      *update_info = ctx->pbi->refresh_frame_flags;
       return VPX_CODEC_OK;
     } else {
       return VPX_CODEC_ERROR;
@@ -643,14 +508,9 @@ static vpx_codec_err_t ctrl_get_frame_corrupted(vpx_codec_alg_priv_t *ctx,
   int *corrupted = va_arg(args, int *);
 
   if (corrupted) {
-    if (ctx->frame_workers) {
-      VPxWorker *const worker = ctx->frame_workers;
-      FrameWorkerData *const frame_worker_data =
-          (FrameWorkerData *)worker->data1;
-      RefCntBuffer *const frame_bufs =
-          frame_worker_data->pbi->common.buffer_pool->frame_bufs;
-      if (frame_worker_data->pbi->common.frame_to_show == NULL)
-        return VPX_CODEC_ERROR;
+    if (ctx->pbi != NULL) {
+      RefCntBuffer *const frame_bufs = ctx->pbi->common.buffer_pool->frame_bufs;
+      if (ctx->pbi->common.frame_to_show == NULL) return VPX_CODEC_ERROR;
       if (ctx->last_show_frame >= 0)
         *corrupted = frame_bufs[ctx->last_show_frame].buf.corrupted;
       return VPX_CODEC_OK;
@@ -667,11 +527,8 @@ static vpx_codec_err_t ctrl_get_frame_size(vpx_codec_alg_priv_t *ctx,
   int *const frame_size = va_arg(args, int *);
 
   if (frame_size) {
-    if (ctx->frame_workers) {
-      VPxWorker *const worker = ctx->frame_workers;
-      FrameWorkerData *const frame_worker_data =
-          (FrameWorkerData *)worker->data1;
-      const VP9_COMMON *const cm = &frame_worker_data->pbi->common;
+    if (ctx->pbi != NULL) {
+      const VP9_COMMON *const cm = &ctx->pbi->common;
       frame_size[0] = cm->width;
       frame_size[1] = cm->height;
       return VPX_CODEC_OK;
@@ -688,11 +545,8 @@ static vpx_codec_err_t ctrl_get_render_size(vpx_codec_alg_priv_t *ctx,
   int *const render_size = va_arg(args, int *);
 
   if (render_size) {
-    if (ctx->frame_workers) {
-      VPxWorker *const worker = ctx->frame_workers;
-      FrameWorkerData *const frame_worker_data =
-          (FrameWorkerData *)worker->data1;
-      const VP9_COMMON *const cm = &frame_worker_data->pbi->common;
+    if (ctx->pbi != NULL) {
+      const VP9_COMMON *const cm = &ctx->pbi->common;
       render_size[0] = cm->render_width;
       render_size[1] = cm->render_height;
       return VPX_CODEC_OK;
@@ -707,13 +561,10 @@ static vpx_codec_err_t ctrl_get_render_size(vpx_codec_alg_priv_t *ctx,
 static vpx_codec_err_t ctrl_get_bit_depth(vpx_codec_alg_priv_t *ctx,
                                           va_list args) {
   unsigned int *const bit_depth = va_arg(args, unsigned int *);
-  VPxWorker *const worker = &ctx->frame_workers[0];
 
   if (bit_depth) {
-    if (worker) {
-      FrameWorkerData *const frame_worker_data =
-          (FrameWorkerData *)worker->data1;
-      const VP9_COMMON *const cm = &frame_worker_data->pbi->common;
+    if (ctx->pbi != NULL) {
+      const VP9_COMMON *const cm = &ctx->pbi->common;
       *bit_depth = cm->bit_depth;
       return VPX_CODEC_OK;
     } else {
@@ -752,10 +603,8 @@ static vpx_codec_err_t ctrl_set_byte_alignment(vpx_codec_alg_priv_t *ctx,
     return VPX_CODEC_INVALID_PARAM;
 
   ctx->byte_alignment = byte_alignment;
-  if (ctx->frame_workers) {
-    VPxWorker *const worker = ctx->frame_workers;
-    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
-    frame_worker_data->pbi->common.byte_alignment = byte_alignment;
+  if (ctx->pbi != NULL) {
+    ctx->pbi->common.byte_alignment = byte_alignment;
   }
   return VPX_CODEC_OK;
 }
@@ -764,10 +613,8 @@ static vpx_codec_err_t ctrl_set_skip_loop_filter(vpx_codec_alg_priv_t *ctx,
                                                  va_list args) {
   ctx->skip_loop_filter = va_arg(args, int);
 
-  if (ctx->frame_workers) {
-    VPxWorker *const worker = ctx->frame_workers;
-    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
-    frame_worker_data->pbi->common.skip_loop_filter = ctx->skip_loop_filter;
+  if (ctx->pbi != NULL) {
+    ctx->pbi->common.skip_loop_filter = ctx->skip_loop_filter;
   }
 
   return VPX_CODEC_OK;
diff --git a/vp9/vp9_dx_iface.h b/vp9/vp9_dx_iface.h
index f0a934073..18bc7ab0d 100644
--- a/vp9/vp9_dx_iface.h
+++ b/vp9/vp9_dx_iface.h
@@ -19,6 +19,8 @@ struct vpx_codec_alg_priv {
   vpx_codec_priv_t base;
   vpx_codec_dec_cfg_t cfg;
   vp9_stream_info_t si;
+  VP9Decoder *pbi;
+  void *user_priv;
   int postproc_cfg_set;
   vp8_postproc_cfg_t postproc_cfg;
   vpx_decrypt_cb decrypt_cb;
@@ -31,11 +33,8 @@ struct vpx_codec_alg_priv {
   int byte_alignment;
   int skip_loop_filter;
 
-  // Frame parallel related.
-  VPxWorker *frame_workers;
-  int num_frame_workers;
   int need_resync;  // wait for key/intra-only frame
-  // BufferPool that holds all reference frames. Shared by all the FrameWorkers.
+  // BufferPool that holds all reference frames.
   BufferPool *buffer_pool;
 
   // External frame buffer info to save for VP9 common.
diff --git a/vp9/vp9dx.mk b/vp9/vp9dx.mk
index 5d6858e86..59f612b94 100644
--- a/vp9/vp9dx.mk
+++ b/vp9/vp9dx.mk
@@ -24,7 +24,6 @@ VP9_DX_SRCS-yes += decoder/vp9_decodeframe.h
 VP9_DX_SRCS-yes += decoder/vp9_detokenize.c
 VP9_DX_SRCS-yes += decoder/vp9_decodemv.h
 VP9_DX_SRCS-yes += decoder/vp9_detokenize.h
-VP9_DX_SRCS-yes += decoder/vp9_dthread.h
 VP9_DX_SRCS-yes += decoder/vp9_decoder.c
 VP9_DX_SRCS-yes += decoder/vp9_decoder.h
 VP9_DX_SRCS-yes += decoder/vp9_dsubexp.c