VideoDecodeAccelerator now SupportsWeakPtr instead of being RefCountedThreadSafe.

content/common/gpu/media/dxva_video_decode_accelerator.cc

 // Copyright (c) 2012 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/common/gpu/media/dxva_video_decode_accelerator.h"
 
 #if !defined(OS_WIN)
 #error This file should only be built on Windows.
 #endif   // !defined(OS_WIN)
 
@@ skipping 530 matching lines @@
       SendMFTMessage(MFT_MESSAGE_NOTIFY_BEGIN_STREAMING, 0),
       "Send MFT_MESSAGE_NOTIFY_BEGIN_STREAMING notification failed",
       PLATFORM_FAILURE, false);
 
   RETURN_AND_NOTIFY_ON_FAILURE(
       SendMFTMessage(MFT_MESSAGE_NOTIFY_START_OF_STREAM, 0),
       "Send MFT_MESSAGE_NOTIFY_START_OF_STREAM notification failed",
       PLATFORM_FAILURE, false);
 
   state_ = kNormal;
-  MessageLoop::current()->PostTask(FROM_HERE,
-      base::Bind(&DXVAVideoDecodeAccelerator::NotifyInitializeDone, this));
+  MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
+      &DXVAVideoDecodeAccelerator::NotifyInitializeDone,
+      base::AsWeakPtr(this)));
   return true;
 }
 
 void DXVAVideoDecodeAccelerator::Decode(
     const media::BitstreamBuffer& bitstream_buffer) {
   DCHECK(CalledOnValidThread());
 
   RETURN_AND_NOTIFY_ON_FAILURE((state_ == kNormal || state_ == kStopped),
       "Invalid state: " << state_, ILLEGAL_STATE,);
 
@@ skipping 27 matching lines @@
   // The Microsoft Media foundation decoder internally buffers up to 30 frames
   // before returning a decoded frame. We need to inform the client that this
   // input buffer is processed as it may stop sending us further input.
   // Note: This may break clients which expect every input buffer to be
   // associated with a decoded output buffer.
   // TODO(ananta)
   // Do some more investigation into whether it is possible to get the MFT
   // decoder to emit an output packet for every input packet.
   // http://code.google.com/p/chromium/issues/detail?id=108121
   MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
-      &DXVAVideoDecodeAccelerator::NotifyInputBufferRead, this,
+      &DXVAVideoDecodeAccelerator::NotifyInputBufferRead, base::AsWeakPtr(this),
       bitstream_buffer.id()));
 }
 
 void DXVAVideoDecodeAccelerator::AssignPictureBuffers(
     const std::vector<media::PictureBuffer>& buffers) {
   DCHECK(CalledOnValidThread());
   // Copy the picture buffers provided by the client to the available list,
   // and mark these buffers as available for use.
   for (size_t buffer_index = 0; buffer_index < buffers.size();
        ++buffer_index) {
@@ skipping 40 matching lines @@
   // the state to kStopped when the decoder returns
   // MF_E_TRANSFORM_NEED_MORE_INPUT.
   // The MFT decoder can buffer upto 30 frames worth of input before returning
   // an output frame. This loop here attempts to retrieve as many output frames
   // as possible from the buffered set.
   while (state_ != kStopped) {
     DoDecode();
   }
 
   MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
-      &DXVAVideoDecodeAccelerator::NotifyFlushDone, this));
+      &DXVAVideoDecodeAccelerator::NotifyFlushDone, base::AsWeakPtr(this)));
 
   state_ = kNormal;
 }
 
 void DXVAVideoDecodeAccelerator::Reset() {
   DCHECK(CalledOnValidThread());
 
   DVLOG(1) << "DXVAVideoDecodeAccelerator::Reset";
 
   RETURN_AND_NOTIFY_ON_FAILURE((state_ == kNormal || state_ == kStopped),
       "Reset: invalid state: " << state_, ILLEGAL_STATE,);
 
   state_ = kResetting;
 
   RETURN_AND_NOTIFY_ON_FAILURE(SendMFTMessage(MFT_MESSAGE_COMMAND_FLUSH, 0),
       "Reset: Failed to send message.", PLATFORM_FAILURE,);
 
   MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
-      &DXVAVideoDecodeAccelerator::NotifyResetDone, this));
+      &DXVAVideoDecodeAccelerator::NotifyResetDone, base::AsWeakPtr(this)));
 
   state_ = DXVAVideoDecodeAccelerator::kNormal;
 }
 
 void DXVAVideoDecodeAccelerator::Destroy() {
   DCHECK(CalledOnValidThread());
   Invalidate();
+  delete this;
 }
 
 bool DXVAVideoDecodeAccelerator::InitDecoder() {
   // We cannot use CoCreateInstance to instantiate the decoder object as that
   // fails in the sandbox. We mimic the steps CoCreateInstance uses to
   // instantiate the object.
   HMODULE decoder_dll = ::GetModuleHandle(L"msmpeg2vdec.dll");
   RETURN_ON_FAILURE(decoder_dll,
                     "msmpeg2vdec.dll required for decoding is not loaded",
                     false);
@@ skipping 241 matching lines @@
     ProcessPendingSamples();
     return true;
   }
   if (pictures_requested_) {
     DVLOG(1) << "Waiting for picture slots from the client.";
     return true;
   }
   // Go ahead and request picture buffers.
   MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
       &DXVAVideoDecodeAccelerator::RequestPictureBuffers,
-      this, surface_desc.Width, surface_desc.Height));
+      base::AsWeakPtr(this), surface_desc.Width, surface_desc.Height));
 
   pictures_requested_ = true;
   return true;
 }
 
 void DXVAVideoDecodeAccelerator::ProcessPendingSamples() {
   if (pending_output_samples_.empty())
     return;
 
   OutputBuffers::iterator index;
 
   for (index = output_picture_buffers_.begin();
        index != output_picture_buffers_.end() &&
        !pending_output_samples_.empty();
        ++index) {
     if (index->second->available()) {
       PendingSampleInfo sample_info = pending_output_samples_.front();
 
       RETURN_AND_NOTIFY_ON_FAILURE(
           index->second->CopyOutputSampleDataToPictureBuffer(
               sample_info.dest_surface),
           "Failed to copy output sample", PLATFORM_FAILURE,);
 
       media::Picture output_picture(index->second->id(),
                                     sample_info.input_buffer_id);
       MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
-          &DXVAVideoDecodeAccelerator::NotifyPictureReady, this,
-          output_picture));
+          &DXVAVideoDecodeAccelerator::NotifyPictureReady,
+          base::AsWeakPtr(this), output_picture));
 
       index->second->set_available(false);
       pending_output_samples_.pop_front();
     }
   }
 }
 
 void DXVAVideoDecodeAccelerator::ClearState() {
   output_picture_buffers_.clear();
   pending_output_samples_.clear();
@@ skipping 52 matching lines @@
         GL_TEXTURE_2D);
   }
 }
 
 void DXVAVideoDecodeAccelerator::NotifyPictureReady(
     const media::Picture& picture) {
   // This task could execute after the decoder has been torn down.
   if (state_ != kUninitialized && client_)
     client_->PictureReady(picture);
 }