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