1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_
6#define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_
7
8#include "base/compiler_specific.h"
9#include "content/common/content_export.h"
10#include "ppapi/host/resource_host.h"
11#include "ppapi/shared_impl/media_stream_buffer_manager.h"
12
13namespace content {
14
15class RendererPpapiHost;
16
17class PepperMediaStreamTrackHostBase
18    : public ppapi::host::ResourceHost,
19      public ppapi::MediaStreamBufferManager::Delegate {
20 protected:
21  PepperMediaStreamTrackHostBase(RendererPpapiHost* host,
22                                 PP_Instance instance,
23                                 PP_Resource resource);
24  virtual ~PepperMediaStreamTrackHostBase();
25
26  enum TrackType {
27    kRead,
28    kWrite
29  };
30  bool InitBuffers(int32_t number_of_buffers,
31                   int32_t buffer_size,
32                   TrackType track_type);
33
34  ppapi::MediaStreamBufferManager* buffer_manager() { return &buffer_manager_; }
35
36  // Sends a buffer index to the corresponding MediaStreamTrackResourceBase
37  // via an IPC message. The resource adds the buffer index into its
38  // |buffer_manager_| for reading or writing.
39  // Also see |MediaStreamBufferManager|.
40  void SendEnqueueBufferMessageToPlugin(int32_t index);
41
42  // Sends a set of buffer indices to the corresponding
43  // MediaStreamTrackResourceBase via an IPC message.
44  // The resource adds the buffer indices into its
45  // |frame_buffer_| for reading or writing. Also see |MediaStreamFrameBuffer|.
46  void SendEnqueueBuffersMessageToPlugin(const std::vector<int32_t>& indices);
47
48  // ResourceMessageHandler overrides:
49  virtual int32_t OnResourceMessageReceived(
50      const IPC::Message& msg,
51      ppapi::host::HostMessageContext* context) OVERRIDE;
52
53  // Message handlers:
54  virtual int32_t OnHostMsgEnqueueBuffer(
55      ppapi::host::HostMessageContext* context, int32_t index);
56
57 private:
58  // Subclasses must implement this method to clean up when the track is closed.
59  virtual void OnClose() = 0;
60
61  // Message handlers:
62  int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context);
63
64  RendererPpapiHost* host_;
65
66  ppapi::MediaStreamBufferManager buffer_manager_;
67
68  DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamTrackHostBase);
69};
70
71}  // namespace content
72
73#endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_
74