content/renderer/pepper/pepper_media_stream_track_host_base.cc

   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 #include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
   6
   7 #include "base/logging.h"
   8 #include "base/numerics/safe_math.h"
   9 #include "content/public/renderer/render_thread.h"
  10 #include "content/public/renderer/renderer_ppapi_host.h"
  11 #include "ppapi/c/pp_errors.h"
  12 #include "ppapi/host/dispatch_host_message.h"
  13 #include "ppapi/host/host_message_context.h"
  14 #include "ppapi/host/ppapi_host.h"
  15 #include "ppapi/proxy/ppapi_messages.h"
  16 #include "ppapi/shared_impl/media_stream_buffer.h"
  17
  18 using ppapi::host::HostMessageContext;
  19 using ppapi::proxy::SerializedHandle;
  20
  21 namespace content {
  22
  23 PepperMediaStreamTrackHostBase::PepperMediaStreamTrackHostBase(
  24     RendererPpapiHost* host,
  25     PP_Instance instance,
  26     PP_Resource resource)
  27     : ResourceHost(host->GetPpapiHost(), instance, resource),
  28       host_(host),
  29       buffer_manager_(this) {}
  30
  31 PepperMediaStreamTrackHostBase::~PepperMediaStreamTrackHostBase() {}
  32
  33 bool PepperMediaStreamTrackHostBase::InitBuffers(int32_t number_of_buffers,
  34                                                  int32_t buffer_size,
  35                                                  TrackType track_type) {
  36   DCHECK_GT(number_of_buffers, 0);
  37   DCHECK_GT(buffer_size,
  38             static_cast<int32_t>(sizeof(ppapi::MediaStreamBuffer::Header)));
  39   // Make each buffer 4 byte aligned.
  40   base::CheckedNumeric<int32_t> buffer_size_aligned = buffer_size;
  41   buffer_size_aligned += (4 - buffer_size % 4);
  42
  43   // TODO(penghuang): |HostAllocateSharedMemoryBuffer| uses sync IPC. We should
  44   // avoid it.
  45   base::CheckedNumeric<int32_t> size = number_of_buffers * buffer_size_aligned;
  46   if (!size.IsValid())
  47     return false;
  48
  49   content::RenderThread* render_thread = content::RenderThread::Get();
  50   scoped_ptr<base::SharedMemory> shm(
  51       render_thread->HostAllocateSharedMemoryBuffer(size.ValueOrDie()).Pass());
  52   if (!shm)
  53     return false;
  54
  55   base::SharedMemoryHandle shm_handle = shm->handle();
  56   if (!buffer_manager_.SetBuffers(number_of_buffers,
  57                                   buffer_size_aligned.ValueOrDie(),
  58                                   shm.Pass(),
  59                                   true)) {
  60     return false;
  61   }
  62
  63   base::PlatformFile platform_file =
  64 #if defined(OS_WIN)
  65       shm_handle;
  66 #elif defined(OS_POSIX)
  67       shm_handle.fd;
  68 #else
  69 #error Not implemented.
  70 #endif
  71   SerializedHandle handle(host_->ShareHandleWithRemote(platform_file, false),
  72                           size.ValueOrDie());
  73   bool readonly = (track_type == kRead);
  74   host()->SendUnsolicitedReplyWithHandles(
  75       pp_resource(),
  76       PpapiPluginMsg_MediaStreamTrack_InitBuffers(
  77           number_of_buffers,
  78           buffer_size_aligned.ValueOrDie(),
  79           readonly),
  80       std::vector<SerializedHandle>(1, handle));
  81   return true;
  82 }
  83
  84 void PepperMediaStreamTrackHostBase::SendEnqueueBufferMessageToPlugin(
  85     int32_t index) {
  86   DCHECK_GE(index, 0);
  87   DCHECK_LT(index, buffer_manager_.number_of_buffers());
  88   host()->SendUnsolicitedReply(
  89       pp_resource(), PpapiPluginMsg_MediaStreamTrack_EnqueueBuffer(index));
  90 }
  91
  92 void PepperMediaStreamTrackHostBase::SendEnqueueBuffersMessageToPlugin(
  93     const std::vector<int32_t>& indices) {
  94   DCHECK_GE(indices.size(), 0U);
  95   host()->SendUnsolicitedReply(pp_resource(),
  96       PpapiPluginMsg_MediaStreamTrack_EnqueueBuffers(indices));
  97 }
  98
  99 int32_t PepperMediaStreamTrackHostBase::OnResourceMessageReceived(
 100     const IPC::Message& msg,
 101     HostMessageContext* context) {
 102   PPAPI_BEGIN_MESSAGE_MAP(PepperMediaStreamTrackHostBase, msg)
 103     PPAPI_DISPATCH_HOST_RESOURCE_CALL(
 104         PpapiHostMsg_MediaStreamTrack_EnqueueBuffer, OnHostMsgEnqueueBuffer)
 105     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_MediaStreamTrack_Close,
 106                                         OnHostMsgClose)
 107   PPAPI_END_MESSAGE_MAP()
 108   return ppapi::host::ResourceHost::OnResourceMessageReceived(msg, context);
 109 }
 110
 111 int32_t PepperMediaStreamTrackHostBase::OnHostMsgEnqueueBuffer(
 112     HostMessageContext* context,
 113     int32_t index) {
 114   buffer_manager_.EnqueueBuffer(index);
 115   return PP_OK;
 116 }
 117
 118 int32_t PepperMediaStreamTrackHostBase::OnHostMsgClose(
 119     HostMessageContext* context) {
 120   OnClose();
 121   return PP_OK;
 122 }
 123
 124 }  // namespace content