Remove threading from RendererGpuVideoAcceleratorFactories

content/renderer/media/rtc_video_decoder.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/rtc_video_decoder.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
 #include "base/safe_numerics.h"
 #include "base/stl_util.h"
+#include "base/synchronization/waitable_event.h"
 #include "base/task_runner_util.h"
 #include "content/child/child_thread.h"
 #include "content/renderer/media/native_handle_impl.h"
 #include "media/base/bind_to_loop.h"
 #include "media/filters/gpu_video_accelerator_factories.h"
 #include "third_party/webrtc/common_video/interface/texture_video_frame.h"
 #include "third_party/webrtc/system_wrappers/interface/ref_count.h"
 
 namespace content {
 
@@ skipping 52 matching lines @@
     : weak_factory_(this),
       weak_this_(weak_factory_.GetWeakPtr()),
       factories_(factories),
       vda_loop_proxy_(factories->GetMessageLoop()),
       decoder_texture_target_(0),
       next_picture_buffer_id_(0),
       state_(UNINITIALIZED),
       decode_complete_callback_(NULL),
       num_shm_buffers_(0),
       next_bitstream_buffer_id_(0),
-      reset_bitstream_buffer_id_(ID_INVALID) {
-  DCHECK(!vda_loop_proxy_->BelongsToCurrentThread());
-  base::WaitableEvent message_loop_async_waiter(false, false);
-  // Waiting here is safe. The media thread is stopped in the child thread and
-  // the child thread is blocked when VideoDecoderFactory::CreateVideoDecoder
-  // runs.
-  vda_loop_proxy_->PostTask(FROM_HERE,
-                            base::Bind(&RTCVideoDecoder::Initialize,
-                                       base::Unretained(this),
-                                       &message_loop_async_waiter));
-  message_loop_async_waiter.Wait();
-}
+      reset_bitstream_buffer_id_(ID_INVALID) {}
 
 RTCVideoDecoder::~RTCVideoDecoder() {
   DVLOG(2) << "~RTCVideoDecoder";
   DCHECK(vda_loop_proxy_->BelongsToCurrentThread());
 
   DestroyVDA();
 
   // Delete all shared memories.
   STLDeleteElements(&available_shm_segments_);
   STLDeleteValues(&bitstream_buffers_in_decoder_);
@@ skipping 19 matching lines @@
   media::VideoCodecProfile profile;
   switch (type) {
     case webrtc::kVideoCodecVP8:
       profile = media::VP8PROFILE_MAIN;
       break;
     default:
       DVLOG(2) << "Video codec not supported:" << type;
       return decoder.Pass();
   }
 
+  base::WaitableEvent waiter(true, false);
   decoder.reset(new RTCVideoDecoder(factories));
-  decoder->vda_ =
-      factories->CreateVideoDecodeAccelerator(profile, decoder.get()).Pass();
+  decoder->vda_loop_proxy_->PostTask(FROM_HERE,
+                                     base::Bind(&RTCVideoDecoder::CreateVDA,
+                                                base::Unretained(decoder.get()),
+                                                profile,
+                                                &decoder->vda_,
+                                                &waiter));
+  waiter.Wait();
   // vda can be NULL if VP8 is not supported.
   if (decoder->vda_ != NULL) {
     decoder->state_ = INITIALIZED;
   } else {
     factories->GetMessageLoop()->DeleteSoon(FROM_HERE, decoder.release());
   }
   return decoder.Pass();
 }
 
 int32_t RTCVideoDecoder::InitDecode(const webrtc::VideoCodec* codecSettings,
@@ skipping 309 matching lines @@
   LOG(ERROR) << "VDA Error:" << error;
   UMA_HISTOGRAM_ENUMERATION("Media.RTCVideoDecoderError",
                             error,
                             media::VideoDecodeAccelerator::LARGEST_ERROR_ENUM);
   DestroyVDA();
 
   base::AutoLock auto_lock(lock_);
   state_ = DECODE_ERROR;
 }
 
-void RTCVideoDecoder::WillDestroyCurrentMessageLoop() {
-  DVLOG(2) << "WillDestroyCurrentMessageLoop";
-  DCHECK(vda_loop_proxy_->BelongsToCurrentThread());
-  factories_->Abort();
-  weak_factory_.InvalidateWeakPtrs();
-  DestroyVDA();
-}
-
-void RTCVideoDecoder::Initialize(base::WaitableEvent* waiter) {
-  DVLOG(2) << "Initialize";
-  DCHECK(vda_loop_proxy_->BelongsToCurrentThread());
-  base::MessageLoop::current()->AddDestructionObserver(this);
-  waiter->Signal();
-}
-
 void RTCVideoDecoder::RequestBufferDecode() {
   DCHECK(vda_loop_proxy_->BelongsToCurrentThread());
   if (!vda_)
     return;
 
   MovePendingBuffersToDecodeBuffers();
 
   while (CanMoreDecodeWorkBeDone()) {
     // Get a buffer and data from the queue.
     SHMBuffer* shm_buffer = NULL;
@@ skipping 139 matching lines @@
     factories_->DeleteTexture(it->second.texture_id());
     dismissed_picture_buffers_.erase(it);
     return;
   }
 
   factories_->WaitSyncPoint(sync_point);
 
   vda_->ReusePictureBuffer(picture_buffer_id);
 }
 
+void RTCVideoDecoder::CreateVDA(media::VideoCodecProfile profile,
+                                scoped_ptr<media::VideoDecodeAccelerator>* vda,
+                                base::WaitableEvent* waiter) {
+  DCHECK(vda_loop_proxy_->BelongsToCurrentThread());
+  *vda = factories_->CreateVideoDecodeAccelerator(profile, this);

[wuchengli, 2013/10/16 07:43:17]

Just use |vda_| here and remove the parameter?

[sheu, 2013/10/21 05:17:35]

Done.

+  waiter->Signal();
+}
+
 void RTCVideoDecoder::DestroyTextures() {
   DCHECK(vda_loop_proxy_->BelongsToCurrentThread());
   std::map<int32, media::PictureBuffer>::iterator it;
 
   for (it = assigned_picture_buffers_.begin();
        it != assigned_picture_buffers_.end();
        ++it) {
     factories_->DeleteTexture(it->second.texture_id());
   }
   assigned_picture_buffers_.clear();
@@ skipping 95 matching lines @@
 
 int32_t RTCVideoDecoder::RecordInitDecodeUMA(int32_t status) {
   // Logging boolean is enough to know if HW decoding has been used. Also,
   // InitDecode is less likely to return an error so enum is not used here.
   bool sample = (status == WEBRTC_VIDEO_CODEC_OK) ? true : false;
   UMA_HISTOGRAM_BOOLEAN("Media.RTCVideoDecoderInitDecodeStatus", sample);
   return status;
 }
 
 }  // namespace content