MJPEG acceleration for video capture using VAAPI, the GPU host part

content/common/gpu/client/gpu_jpeg_decode_accelerator_host.cc

+// Copyright 2015 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/client/gpu_jpeg_decode_accelerator_host.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/memory/weak_ptr.h"
+#include "base/synchronization/waitable_event.h"
+#include "content/common/gpu/client/gpu_channel_host.h"
+#include "content/common/gpu/gpu_messages.h"
+#include "ipc/ipc_listener.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+
+namespace content {
+
+// Class to receive AcceleratedJpegDecoderHostMsg_DecodeAck IPC message on IO
+// thread. This does very similar what MessageFilter usually does. It is not
+// MessageFilter because GpuChannelHost doesn't support AddFilter.
+class GpuJpegDecodeAcceleratorHost::Receiver : public IPC::Listener,
+                                               public base::NonThreadSafe {
+ public:
+  Receiver(Client* client,
+           const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner)
+      : client_(client),
+        io_task_runner_(io_task_runner),
+        weak_factory_for_io_(this) {
+    DCHECK(CalledOnValidThread());
+  }
+
+  ~Receiver() { DCHECK(CalledOnValidThread()); }
+
+  void InvalidateWeakPtr(base::WaitableEvent* event) {
+    DCHECK(io_task_runner_->BelongsToCurrentThread());
+    weak_factory_for_io_.InvalidateWeakPtrs();
+    event->Signal();
+  }
+
+  // IPC::Listener implementation.
+  void OnChannelError() override {
+    DCHECK(io_task_runner_->BelongsToCurrentThread());
+
+    OnDecodeAck(kInvalidBitstreamBufferId, PLATFORM_FAILURE);
+  }
+
+  bool OnMessageReceived(const IPC::Message& msg) override {
+    DCHECK(io_task_runner_->BelongsToCurrentThread());
+
+    bool handled = true;
+    IPC_BEGIN_MESSAGE_MAP(GpuJpegDecodeAcceleratorHost::Receiver, msg)
+    IPC_MESSAGE_HANDLER(AcceleratedJpegDecoderHostMsg_DecodeAck, OnDecodeAck)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+    IPC_END_MESSAGE_MAP()
+    DCHECK(handled);
+    return handled;
+  }
+
+  base::WeakPtr<IPC::Listener> AsWeakPtrForIO() {
+    return weak_factory_for_io_.GetWeakPtr();
+  }
+
+ private:
+  void OnDecodeAck(int32_t bitstream_buffer_id, Error error) {
+    DCHECK(io_task_runner_->BelongsToCurrentThread());
+
+    if (!client_)
+      return;
+
+    if (error == media::JpegDecodeAccelerator::NO_ERROR) {
+      client_->VideoFrameReady(bitstream_buffer_id);
+    } else {
+      // Only NotifyError once.
+      // Client::NotifyError() may trigger deletion of |this| (on another
+      // thread), so calling it needs to be the last thing done on this stack!
+      media::JpegDecodeAccelerator::Client* client = nullptr;
+      std::swap(client, client_);
+      client->NotifyError(bitstream_buffer_id, error);
+    }
+  }
+
+  Client* client_;
+
+  // GPU IO task runner.
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+
+  // Weak pointers will be invalidated on IO thread.
+  base::WeakPtrFactory<Receiver> weak_factory_for_io_;
+
+  DISALLOW_COPY_AND_ASSIGN(Receiver);
+};
+
+GpuJpegDecodeAcceleratorHost::GpuJpegDecodeAcceleratorHost(
+    GpuChannelHost* channel,
+    int32 route_id,
+    const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner)
+    : channel_(channel),
+      decoder_route_id_(route_id),
+      io_task_runner_(io_task_runner) {
+  DCHECK(channel_);
+  DCHECK_NE(decoder_route_id_, MSG_ROUTING_NONE);
+}
+
+GpuJpegDecodeAcceleratorHost::~GpuJpegDecodeAcceleratorHost() {
+  DCHECK(CalledOnValidThread());
+  Send(new AcceleratedJpegDecoderMsg_Destroy(decoder_route_id_));
+
+  channel_->RemoveRoute(decoder_route_id_);
+
+  // Invalidate weak ptr of |receiver_|. After that, no more messages will be
+  // routed to |receiver_| on IO thread.
+  base::WaitableEvent event(false, false);
+  io_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&Receiver::InvalidateWeakPtr,
+                 base::Unretained(receiver_.get()), base::Unretained(&event)));
+  event.Wait();
+}
+
+bool GpuJpegDecodeAcceleratorHost::Initialize(
+    media::JpegDecodeAccelerator::Client* client) {
+  DCHECK(CalledOnValidThread());
+
+  bool succeeded = false;
+  // This cannot be on IO thread because the msg is synchronous.
+  Send(new GpuMsg_CreateJpegDecoder(decoder_route_id_, &succeeded));
+
+  if (!succeeded) {
+    DLOG(ERROR) << "Send(GpuMsg_CreateJpegDecoder()) failed";
+    return false;
+  }
+
+  receiver_.reset(new Receiver(client, io_task_runner_));
+
+  return true;
+}
+
+void GpuJpegDecodeAcceleratorHost::Decode(
+    const media::BitstreamBuffer& bitstream_buffer,
+    const scoped_refptr<media::VideoFrame>& video_frame) {
+  DCHECK(CalledOnValidThread());
+
+  DCHECK(
+      base::SharedMemory::IsHandleValid(video_frame->shared_memory_handle()));
+
+  base::SharedMemoryHandle input_handle =
+      channel_->ShareToGpuProcess(bitstream_buffer.handle());
+  if (!base::SharedMemory::IsHandleValid(input_handle)) {
+    DLOG(ERROR) << "Failed to duplicate handle of BitstreamBuffer";
+    return;
+  }
+  base::SharedMemoryHandle output_handle =
+      channel_->ShareToGpuProcess(video_frame->shared_memory_handle());
+  if (!base::SharedMemory::IsHandleValid(output_handle)) {
+    DLOG(ERROR) << "Failed to duplicate handle of VideoFrame";
+    if (input_handle.auto_close) {
+      // Defer closing task to the ScopedFD.
+      base::ScopedFD(input_handle.fd);
+    }
+    return;
+  }
+
+  size_t output_buffer_size = media::VideoFrame::AllocationSize(
+      video_frame->format(), video_frame->coded_size());
+
+  AcceleratedJpegDecoderMsg_Decode_Params decode_params;
+  decode_params.coded_size = video_frame->coded_size();
+  decode_params.input_buffer_id = bitstream_buffer.id();
+  decode_params.input_buffer_handle = input_handle;
+  decode_params.input_buffer_size = bitstream_buffer.size();
+  decode_params.output_video_frame_handle = output_handle;
+  decode_params.output_buffer_size = output_buffer_size;
+  Send(new AcceleratedJpegDecoderMsg_Decode(decoder_route_id_, decode_params));
+}
+
+void GpuJpegDecodeAcceleratorHost::Send(IPC::Message* message) {
+  DCHECK(CalledOnValidThread());
+
+  if (!channel_->Send(message)) {
+    DLOG(ERROR) << "Send(" << message->type() << ") failed";
+  }
+}
+
+base::WeakPtr<IPC::Listener> GpuJpegDecodeAcceleratorHost::GetReceiver() {
+  return receiver_->AsWeakPtrForIO();
+}
+
+}  // namespace content