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// Copyright (c) 2013 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 CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_SOURCE_HOST_H_
#define CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_SOURCE_HOST_H_
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "content/common/content_export.h"
#include "content/renderer/media/video_source_handler.h"
#include "ppapi/c/pp_time.h"
#include "ppapi/c/ppb_image_data.h"
#include "ppapi/host/host_message_context.h"
#include "ppapi/host/resource_host.h"
struct PP_ImageDataDesc;
namespace content {
class PPB_ImageData_Impl;
class RendererPpapiHost;
class CONTENT_EXPORT PepperVideoSourceHost : public ppapi::host::ResourceHost {
public:
PepperVideoSourceHost(RendererPpapiHost* host,
PP_Instance instance,
PP_Resource resource);
~PepperVideoSourceHost() override;
int32_t OnResourceMessageReceived(
const IPC::Message& msg,
ppapi::host::HostMessageContext* context) override;
private:
// This helper object receives frames on a video worker thread and passes
// them on to us.
class FrameReceiver : public FrameReaderInterface,
public base::RefCountedThreadSafe<FrameReceiver> {
public:
explicit FrameReceiver(const base::WeakPtr<PepperVideoSourceHost>& host);
// FrameReaderInterface implementation.
void GotFrame(const scoped_refptr<media::VideoFrame>& frame) override;
private:
friend class base::RefCountedThreadSafe<FrameReceiver>;
~FrameReceiver() override;
base::WeakPtr<PepperVideoSourceHost> host_;
// |thread_checker_| is bound to the main render thread.
base::ThreadChecker thread_checker_;
};
friend class FrameReceiver;
int32_t OnHostMsgOpen(ppapi::host::HostMessageContext* context,
const std::string& stream_url);
int32_t OnHostMsgGetFrame(ppapi::host::HostMessageContext* context);
int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context);
// Sends the reply to a GetFrame message from the plugin. A reply is always
// sent and last_frame_, reply_context_, and get_frame_pending_ are all reset.
void SendGetFrameReply();
// Sends the reply to a GetFrame message from the plugin in case of an error.
void SendGetFrameErrorReply(int32_t error);
void Close();
RendererPpapiHost* renderer_ppapi_host_;
ppapi::host::ReplyMessageContext reply_context_;
scoped_ptr<VideoSourceHandler> source_handler_;
scoped_refptr<FrameReceiver> frame_receiver_;
std::string stream_url_;
scoped_refptr<media::VideoFrame> last_frame_;
// An internal frame buffer to avoid reallocations. It is only allocated if
// scaling is needed.
scoped_refptr<media::VideoFrame> scaled_frame_;
bool get_frame_pending_;
// We use only one ImageData resource in order to avoid allocating
// shared memory repeatedly. We send the same one each time the plugin
// requests a frame. For this to work, the plugin must finish using
// the ImageData it receives prior to calling GetFrame, and not access
// the ImageData until it gets its next callback to GetFrame.
scoped_refptr<PPB_ImageData_Impl> shared_image_;
PP_ImageDataDesc shared_image_desc_;
base::WeakPtrFactory<PepperVideoSourceHost> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(PepperVideoSourceHost);
};
} // namespace content
#endif // CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_SOURCE_HOST_H_
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