Finish plumbing MojoVideoDecoder.

media/mojo/services/mojo_video_decoder_service.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 "media/mojo/services/mojo_video_decoder_service.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/logging.h"
+#include "media/base/decoder_buffer.h"
+#include "media/base/video_decoder.h"
+#include "media/base/video_decoder_config.h"
+#include "media/base/video_frame.h"
+#include "media/mojo/common/media_type_converters.h"
+#include "media/mojo/services/mojo_media_client.h"
+#include "mojo/public/c/system/types.h"
+#include "mojo/public/cpp/system/buffer.h"
+#include "mojo/public/cpp/system/handle.h"
+
+namespace media {
+
+MojoVideoDecoderService::MojoVideoDecoderService(
+    mojo::InterfaceRequest<interfaces::VideoDecoder> request,
+    MojoMediaClient* mojo_media_client)
+    : binding_(this, std::move(request)),
+      mojo_media_client_(mojo_media_client),
+      weak_factory_(this) {
+  weak_this_ = weak_factory_.GetWeakPtr();
+}
+
+MojoVideoDecoderService::~MojoVideoDecoderService() {}
+
+void MojoVideoDecoderService::Construct(
+    interfaces::VideoDecoderClientPtr client,
+    mojo::ScopedDataPipeConsumerHandle decoder_buffer_pipe) {
+  DVLOG(1) << __FUNCTION__;
+  CHECK(!decoder_);
+
+  // TODO(sandersd): Provide callback for requesting a stub.
+  decoder_ = mojo_media_client_->CreateVideoDecoder(
+      base::ThreadTaskRunnerHandle::Get());
+
+  client_ = std::move(client);
+  decoder_buffer_pipe_ = std::move(decoder_buffer_pipe);
+}
+
+void MojoVideoDecoderService::Initialize(
+    interfaces::VideoDecoderConfigPtr config,
+    bool low_delay,
+    const InitializeCallback& callback) {
+  DVLOG(1) << __FUNCTION__;
+
+  if (!decoder_) {
+    callback.Run(false);
+    return;
+  }
+
+  decoder_->Initialize(
+      config.To<VideoDecoderConfig>(), low_delay, nullptr,
+      base::Bind(&MojoVideoDecoderService::OnDecoderInitialized, weak_this_,
+                 callback),
+      base::Bind(&MojoVideoDecoderService::OnDecoderOutput, weak_this_));
+}
+
+void MojoVideoDecoderService::OnDecoderInitialized(
+    const InitializeCallback& callback,
+    bool success) {
+  DVLOG(1) << __FUNCTION__;
+  callback.Run(success);
+}
+
+void MojoVideoDecoderService::OnDecoderOutput(
+    const scoped_refptr<VideoFrame>& frame) {
+  DVLOG(1) << __FUNCTION__;
+  client_->OnVideoFrameDecoded(interfaces::VideoFrame::From(frame));
+}
+
+void MojoVideoDecoderService::Decode(interfaces::DecoderBufferPtr buffer,
+                                     const DecodeCallback& callback) {
+  DVLOG(1) << __FUNCTION__;
+
+  if (!decoder_) {
+    callback.Run(interfaces::DecodeStatus::DECODE_ERROR);
+    return;
+  }
+
+  scoped_refptr<DecoderBuffer> media_buffer(
+      buffer.To<scoped_refptr<DecoderBuffer>>());
+  if (!media_buffer->end_of_stream()) {
+    MojoHandleSignalsState state;
+    CHECK_EQ(
+        MojoWait(decoder_buffer_pipe_.get().value(),
+                 MOJO_HANDLE_SIGNAL_READABLE, MOJO_DEADLINE_INDEFINITE, &state),
+        MOJO_RESULT_OK);
+    CHECK_EQ(state.satisfied_signals, MOJO_HANDLE_SIGNAL_READABLE);
+    uint32_t data_size =
+        base::checked_cast<uint32_t>(media_buffer->data_size());

[dcheng, 2016/05/17 06:32:29]

This shouldn't be a checked_cast: it's in the GPU process processing data from
the renderer. The renderer shouldn't be able to crash the GPU just by sending a
bad message.

[sandersd (OOO until July 31), 2016/05/17 23:05:00]

Done.

+    DCHECK_GT(data_size, 0u);
+    uint32_t bytes_read = data_size;
+    CHECK_EQ(

[dcheng, 2016/05/17 06:32:29]

Ditto for this and the other CHECKs in this file when processing mojo messages.

[sandersd (OOO until July 31), 2016/05/17 23:05:00]

Done.

I also updated MojoAudioDecoderService, although in the future they should share
an implementation of this.

+        ReadDataRaw(decoder_buffer_pipe_.get(), media_buffer->writable_data(),
+                    &bytes_read, MOJO_READ_DATA_FLAG_ALL_OR_NONE),
+        MOJO_RESULT_OK);
+    CHECK_EQ(bytes_read, data_size);
+  }
+
+  decoder_->Decode(media_buffer,
+                   base::Bind(&MojoVideoDecoderService::OnDecoderDecoded,
+                              weak_this_, callback));
+}
+
+void MojoVideoDecoderService::OnDecoderDecoded(const DecodeCallback& callback,
+                                               DecodeStatus status) {
+  DVLOG(1) << __FUNCTION__;
+  callback.Run(static_cast<interfaces::DecodeStatus>(status));
+}
+
+void MojoVideoDecoderService::Reset(const ResetCallback& callback) {
+  DVLOG(1) << __FUNCTION__;
+  if (!decoder_) {
+    callback.Run();
+    return;
+  }
+  decoder_->Reset(base::Bind(&MojoVideoDecoderService::OnDecoderReset,
+                             weak_this_, callback));
+}
+
+void MojoVideoDecoderService::OnDecoderReset(const ResetCallback& callback) {
+  DVLOG(1) << __FUNCTION__;
+  callback.Run();
+}
+
+}  // namespace media