Decouple Media Service

content/common/gpu/media/media_channel.cc

+// Copyright 2016 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/media_channel.h"
+
+#include "content/common/gpu/gpu_channel.h"
+#include "content/common/gpu/media/gpu_video_decode_accelerator.h"
+#include "content/common/gpu/media/gpu_video_encode_accelerator.h"
+#include "content/common/gpu/media/media_messages.h"
+
+namespace content {
+
+namespace {
+
+void SendCreateJpegDecoderResult(
+    scoped_ptr<IPC::Message> reply_message,
+    scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
+    base::WeakPtr<GpuChannel> channel,
+    scoped_refptr<GpuChannelMessageFilter> filter,
+    bool result) {
+  GpuChannelMsg_CreateJpegDecoder::WriteReplyParams(reply_message.get(),
+                                                    result);
+  if (io_task_runner->BelongsToCurrentThread()) {
+    filter->Send(reply_message.release());
+  } else if (channel) {
+    channel->Send(reply_message.release());
+  }
+}
+
+class DispatchHelper {
+ public:
+  DispatchHelper(MediaChannel* channel, uint32_t routing_id)
+      : channel_(channel), routing_id_(routing_id) {}
+
+  bool Send(IPC::Message* msg) { return channel_->Send(msg); }
+
+  void OnCreateVideoDecoder(const media::VideoDecodeAccelerator::Config& config,
+                            int32_t decoder_route_id,
+                            IPC::Message* reply_message) {
+    channel_->OnCreateVideoDecoder(routing_id_, config, decoder_route_id,
+                                   reply_message);
+  }
+
+  void OnCreateVideoEncoder(const CreateVideoEncoderParams& params,
+                            IPC::Message* reply_message) {
+    channel_->OnCreateVideoEncoder(routing_id_, params, reply_message);
+  }
+
+ private:
+  MediaChannel* const channel_;
+  const int32_t routing_id_;
+  DISALLOW_COPY_AND_ASSIGN(DispatchHelper);
+};
+
+}  // namespace
+
+MediaChannel::MediaChannel(GpuChannel* channel) : channel_(channel) {}
+
+MediaChannel::~MediaChannel() {}
+
+bool MediaChannel::Send(IPC::Message* msg) {
+  return channel_->Send(msg);
+}
+
+bool MediaChannel::OnMessageReceived(const IPC::Message& message) {
+  DispatchHelper helper(this, message.routing_id());
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(MediaChannel, message)
+    IPC_MESSAGE_FORWARD_DELAY_REPLY(GpuCommandBufferMsg_CreateVideoDecoder,
+                                    &helper,
+                                    DispatchHelper::OnCreateVideoDecoder)
+    IPC_MESSAGE_FORWARD_DELAY_REPLY(GpuCommandBufferMsg_CreateVideoEncoder,
+                                    &helper,
+                                    DispatchHelper::OnCreateVideoEncoder)
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuChannelMsg_CreateJpegDecoder,
+                                    OnCreateJpegDecoder)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void MediaChannel::OnCreateJpegDecoder(int32_t route_id,
+                                       IPC::Message* reply_msg) {
+  scoped_ptr<IPC::Message> msg(reply_msg);
+  if (!jpeg_decoder_) {
+    jpeg_decoder_.reset(
+        new GpuJpegDecodeAccelerator(channel_, channel_->io_task_runner()));
+  }
+  jpeg_decoder_->AddClient(
+      route_id, base::Bind(&SendCreateJpegDecoderResult, base::Passed(&msg),
+                           channel_->io_task_runner(), channel_->AsWeakPtr(),
+                           make_scoped_refptr(channel_->filter())));
+}
+
+void MediaChannel::OnCreateVideoDecoder(
+    int32_t command_buffer_route_id,
+    const media::VideoDecodeAccelerator::Config& config,
+    int32_t decoder_route_id,
+    IPC::Message* reply_message) {
+  TRACE_EVENT0("gpu", "MediaChannel::OnCreateVideoDecoder");
+  GpuCommandBufferStub* stub =
+      channel_->LookupCommandBuffer(command_buffer_route_id);
+  if (!stub) {
+    reply_message->set_reply_error();
+    Send(reply_message);
+    return;
+  }
+  GpuVideoDecodeAccelerator* decoder = new GpuVideoDecodeAccelerator(
+      decoder_route_id, stub, stub->channel()->io_task_runner());
+  bool succeeded = decoder->Initialize(config);
+  GpuCommandBufferMsg_CreateVideoDecoder::WriteReplyParams(reply_message,
+                                                           succeeded);
+  Send(reply_message);
+
+  // decoder is registered as a DestructionObserver of this stub and will
+  // self-delete during destruction of this stub.
+}
+
+void MediaChannel::OnCreateVideoEncoder(int command_buffer_route_id,

[dcheng, 2016/03/04 23:07:39]

Nit: int32_t

+                                        const CreateVideoEncoderParams& params,
+                                        IPC::Message* reply_message) {
+  TRACE_EVENT0("gpu", "MediaChannel::OnCreateVideoEncoder");
+  GpuCommandBufferStub* stub =
+      channel_->LookupCommandBuffer(command_buffer_route_id);
+  if (!stub) {
+    reply_message->set_reply_error();
+    Send(reply_message);
+    return;
+  }
+  GpuVideoEncodeAccelerator* encoder =
+      new GpuVideoEncodeAccelerator(params.encoder_route_id, stub);
+  bool succeeded =
+      encoder->Initialize(params.input_format, params.input_visible_size,
+                          params.output_profile, params.initial_bitrate);
+  GpuCommandBufferMsg_CreateVideoEncoder::WriteReplyParams(reply_message,
+                                                           succeeded);
+  Send(reply_message);
+
+  // encoder is registered as a DestructionObserver of this stub and will
+  // self-delete during destruction of this stub.
+}
+
+}  // namespace content