Implement PPAPI VideoDecode out-of-process support

This CL implements the proxy necessary for out-of-process video decoding and
introduces a shared base class between the PPB_VideoDecoder_Impl and the proxy.

BUG=NONE
TEST=gles2 plugin runs with or without --ppapi-out-of-process flag, no crashes


Review URL: http://codereview.chromium.org/7545014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95724 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 208 insertions, 0 deletions

diff --git a/ppapi/shared_impl/tracker_base.h b/ppapi/shared_impl/tracker_base.h
index 7d4d9e8..7790ea3 100644
--- a/ppapi/shared_impl/tracker_base.h
+++ b/ppapi/shared_impl/tracker_base.h
@@ -23,6 +23,8 @@ class Var;
 // called "Tracker", and this would be used in both the plugin side of the
 // proxy as well as the implementation in the renderer. Currently, all this
 // does is forward to the process-type-specific tracker to get the information.
+// TODO(fischman/vrk): When brettw fixes the TODO above, fix the ugliness in
+// VideoDecoderImpl accordingly.
 class TrackerBase {
  public:
   // Must be called before any other function that uses the TrackerBase.
diff --git a/ppapi/shared_impl/video_decoder_impl.cc b/ppapi/shared_impl/video_decoder_impl.cc
new file mode 100644
index 0000000..ae185c1
--- /dev/null
+++ b/ppapi/shared_impl/video_decoder_impl.cc
@@ -0,0 +1,109 @@
+// Copyright (c) 2011 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 "ppapi/shared_impl/video_decoder_impl.h"
+
+#include "base/logging.h"
+#include "gpu/command_buffer/client/gles2_implementation.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/proxy/plugin_resource_tracker.h"
+#include "ppapi/thunk/ppb_context_3d_api.h"
+#include "ppapi/thunk/enter.h"
+
+using ppapi::thunk::PPB_Context3D_API;
+
+namespace ppapi {
+
+VideoDecoderImpl::VideoDecoderImpl()
+    : flush_callback_(PP_MakeCompletionCallback(NULL, NULL)),
+      reset_callback_(PP_MakeCompletionCallback(NULL, NULL)),
+      context3d_id_(0),
+      gles2_impl_(NULL) {
+}
+
+thunk::PPB_VideoDecoder_API* VideoDecoderImpl::AsPPB_VideoDecoder_API() {
+  return this;
+}
+
+VideoDecoderImpl::~VideoDecoderImpl() {
+}
+
+bool VideoDecoderImpl::Init(PP_Resource context3d_id,
+                            PPB_Context3D_API* context3d,
+                            const PP_VideoConfigElement* decoder_config) {
+  if (!context3d || !decoder_config || !context3d_id)
+    return false;
+
+  DCHECK(!gles2_impl_ && !context3d_id_);
+  gles2_impl_ = context3d->GetGLES2Impl();
+  AddRefResource(context3d_id);
+  context3d_id_ = context3d_id;
+  return true;
+}
+
+void VideoDecoderImpl::Destroy() {
+  context3d_id_ = 0;
+  gles2_impl_ = NULL;
+  UnrefResource(context3d_id_);
+}
+
+void VideoDecoderImpl::SetFlushCallback(PP_CompletionCallback callback) {
+  CHECK(callback.func);
+  DCHECK(!flush_callback_.func);
+  flush_callback_ = callback;
+}
+
+void VideoDecoderImpl::SetResetCallback(PP_CompletionCallback callback) {
+  CHECK(callback.func);
+  DCHECK(!reset_callback_.func);
+  reset_callback_ = callback;
+}
+
+void VideoDecoderImpl::SetBitstreamBufferCallback(
+    int32 bitstream_buffer_id, PP_CompletionCallback callback) {
+  CHECK(bitstream_buffer_callbacks_.insert(
+      std::make_pair(bitstream_buffer_id, callback)).second);
+}
+
+void VideoDecoderImpl::RunFlushCallback(int32 result) {
+  DCHECK(flush_callback_.func);
+  PP_RunAndClearCompletionCallback(&flush_callback_, result);
+}
+
+void VideoDecoderImpl::RunResetCallback(int32 result) {
+  DCHECK(reset_callback_.func);
+  PP_RunAndClearCompletionCallback(&reset_callback_, result);
+}
+
+void VideoDecoderImpl::RunBitstreamBufferCallback(
+    int32 bitstream_buffer_id, int32 result) {
+  CallbackById::iterator it =
+      bitstream_buffer_callbacks_.find(bitstream_buffer_id);
+  DCHECK(it != bitstream_buffer_callbacks_.end());
+  PP_CompletionCallback cc = it->second;
+  bitstream_buffer_callbacks_.erase(it);
+  PP_RunCompletionCallback(&cc, PP_OK);
+}
+
+void VideoDecoderImpl::FlushCommandBuffer() {
+  if (gles2_impl_)
+    gles2_impl_->Flush();
+}
+
+bool VideoDecoderImpl::CopyConfigsToVector(
+    const PP_VideoConfigElement* configs_to_copy,
+    std::vector<PP_VideoConfigElement>* out_configs) {
+  // TODO(fischman/vrk): This is still broken. We need to get rid of the silly
+  // PP_VideoConfigElement vector in favor of a struct (see TODO in
+  // ppb_video_decoder_dev.h).
+  const PP_VideoConfigElement* current = configs_to_copy;
+  while (current && *current != PP_VIDEOATTR_DICTIONARY_TERMINATOR) {
+    out_configs->push_back(*current);
+    out_configs->push_back(*(current + 1));
+    current += 2;
+  }
+  return true;
+}
+
+}  // namespace ppapi
diff --git a/ppapi/shared_impl/video_decoder_impl.h b/ppapi/shared_impl/video_decoder_impl.h
new file mode 100644
index 0000000..cc0da6d
--- /dev/null
+++ b/ppapi/shared_impl/video_decoder_impl.h
@@ -0,0 +1,97 @@
+// Copyright (c) 2011 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.
+
+#ifndef PPAPI_SHARED_IMPL_VIDEO_DECODER_IMPL_H_
+#define PPAPI_SHARED_IMPL_VIDEO_DECODER_IMPL_H_
+
+#include <map>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ppapi/c/dev/ppb_video_decoder_dev.h"
+#include "ppapi/shared_impl/resource_object_base.h"
+#include "ppapi/thunk/ppb_video_decoder_api.h"
+
+namespace gpu {
+namespace gles2 {
+class GLES2Implementation;
+}  // namespace gles2
+}  // namespace gpu
+
+namespace ppapi {
+namespace thunk {
+class PPB_Context3D_API;
+}  // namespace thunk
+}  // namespace ppapi
+
+namespace ppapi {
+
+// Implements the logic to set and run callbacks for various video decoder
+// events. Both the proxy and the renderer implementation share this code.
+class VideoDecoderImpl : public ResourceObjectBase,
+                         public thunk::PPB_VideoDecoder_API {
+ public:
+  VideoDecoderImpl();
+  virtual ~VideoDecoderImpl();
+
+  // ResourceObjectBase implementation.
+  virtual PPB_VideoDecoder_API* AsPPB_VideoDecoder_API() OVERRIDE;
+
+  // PPB_VideoDecoder_API implementation.
+  virtual void Destroy() OVERRIDE;
+
+  // Copy C-style config list into |out_configs| vector.
+  static bool CopyConfigsToVector(
+      const PP_VideoConfigElement* configs_to_copy,
+      std::vector<PP_VideoConfigElement>* out_configs);
+
+ protected:
+  void SetFlushCallback(PP_CompletionCallback callback);
+  void SetResetCallback(PP_CompletionCallback callback);
+  void SetBitstreamBufferCallback(
+      int32 bitstream_buffer_id, PP_CompletionCallback callback);
+
+  void RunFlushCallback(int32 result);
+  void RunResetCallback(int32 result);
+  void RunBitstreamBufferCallback(int32 bitstream_buffer_id, int32 result);
+
+  // Tell command buffer to process all commands it has received so far.
+  void FlushCommandBuffer();
+
+  // Initialize the underlying decoder and return success status.
+  virtual bool Init(PP_Resource context3d_id,
+                    thunk::PPB_Context3D_API* context,
+                    const PP_VideoConfigElement* dec_config);
+
+  // TODO(fischman/vrk): Remove accordingly when brettw has merged resource
+  // trackers.
+  virtual void AddRefResource(PP_Resource resource) = 0;
+  virtual void UnrefResource(PP_Resource resource) = 0;
+
+ private:
+  // Key: bitstream_buffer_id, value: callback to run when bitstream decode is
+  // done.
+  typedef std::map<int32, PP_CompletionCallback> CallbackById;
+
+  PP_CompletionCallback flush_callback_;
+  PP_CompletionCallback reset_callback_;
+  CallbackById bitstream_buffer_callbacks_;
+
+  // The resource ID of the underlying Context3d object being used.  Used only
+  // for reference counting to keep it alive for the lifetime of |*this|.
+  PP_Resource context3d_id_;
+
+  // Reference to the GLES2Implementation owned by |context3d_id_|.
+  // Context3D is guaranteed to be alive for the lifetime of this class.
+  // In the out-of-process case, Context3D's gles2_impl() exists in the plugin
+  // process only, so gles2_impl_ is NULL in that case.
+  gpu::gles2::GLES2Implementation* gles2_impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoDecoderImpl);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_VIDEO_DECODER_IMPL_H_