src/content/renderer/pepper/pepper_video_source_host.cc

   1 // Copyright (c) 2013 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_video_source_host.h"
   6
   7 #include "base/bind.h"
   8 #include "base/numerics/safe_conversions.h"
   9 #include "content/public/renderer/renderer_ppapi_host.h"
  10 #include "content/renderer/pepper/ppb_image_data_impl.h"
  11 #include "content/renderer/render_thread_impl.h"
  12 #include "ppapi/c/pp_errors.h"
  13 #include "ppapi/host/dispatch_host_message.h"
  14 #include "ppapi/host/ppapi_host.h"
  15 #include "ppapi/proxy/ppapi_messages.h"
  16 #include "ppapi/proxy/ppb_image_data_proxy.h"
  17 #include "ppapi/shared_impl/scoped_pp_resource.h"
  18 #include "ppapi/thunk/enter.h"
  19 #include "ppapi/thunk/ppb_image_data_api.h"
  20 #include "third_party/libyuv/include/libyuv/convert.h"
  21 #include "third_party/skia/include/core/SkBitmap.h"
  22
  23 using ppapi::host::HostMessageContext;
  24 using ppapi::host::ReplyMessageContext;
  25
  26 namespace content {
  27
  28 PepperVideoSourceHost::FrameReceiver::FrameReceiver(
  29     const base::WeakPtr<PepperVideoSourceHost>& host)
  30     : host_(host),
  31       main_message_loop_proxy_(base::MessageLoopProxy::current()) {}
  32
  33 PepperVideoSourceHost::FrameReceiver::~FrameReceiver() {}
  34
  35 bool PepperVideoSourceHost::FrameReceiver::GotFrame(
  36     const scoped_refptr<media::VideoFrame>& frame) {
  37   // It's not safe to access the host from this thread, so post a task to our
  38   // main thread to transfer the new frame.
  39   main_message_loop_proxy_->PostTask(
  40       FROM_HERE, base::Bind(&FrameReceiver::OnGotFrame, this, frame));
  41
  42   return true;
  43 }
  44
  45 void PepperVideoSourceHost::FrameReceiver::OnGotFrame(
  46     const scoped_refptr<media::VideoFrame>& frame) {
  47   if (host_.get()) {
  48     // Hold a reference to the new frame and release the previous.
  49     host_->last_frame_ = frame;
  50
  51     if (host_->get_frame_pending_)
  52       host_->SendGetFrameReply();
  53   }
  54 }
  55
  56 PepperVideoSourceHost::PepperVideoSourceHost(RendererPpapiHost* host,
  57                                              PP_Instance instance,
  58                                              PP_Resource resource)
  59     : ResourceHost(host->GetPpapiHost(), instance, resource),
  60       renderer_ppapi_host_(host),
  61       source_handler_(new VideoSourceHandler(NULL)),
  62       get_frame_pending_(false),
  63       weak_factory_(this) {
  64   frame_receiver_ = new FrameReceiver(weak_factory_.GetWeakPtr());
  65 }
  66
  67 PepperVideoSourceHost::~PepperVideoSourceHost() { Close(); }
  68
  69 int32_t PepperVideoSourceHost::OnResourceMessageReceived(
  70     const IPC::Message& msg,
  71     HostMessageContext* context) {
  72   IPC_BEGIN_MESSAGE_MAP(PepperVideoSourceHost, msg)
  73   PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_VideoSource_Open,
  74                                     OnHostMsgOpen)
  75   PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_VideoSource_GetFrame,
  76                                       OnHostMsgGetFrame)
  77   PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_VideoSource_Close,
  78                                       OnHostMsgClose)
  79   IPC_END_MESSAGE_MAP()
  80   return PP_ERROR_FAILED;
  81 }
  82
  83 int32_t PepperVideoSourceHost::OnHostMsgOpen(HostMessageContext* context,
  84                                              const std::string& stream_url) {
  85   GURL gurl(stream_url);
  86   if (!gurl.is_valid())
  87     return PP_ERROR_BADARGUMENT;
  88
  89   if (!source_handler_->Open(gurl.spec(), frame_receiver_.get()))
  90     return PP_ERROR_BADARGUMENT;
  91
  92   stream_url_ = gurl.spec();
  93
  94   ReplyMessageContext reply_context = context->MakeReplyMessageContext();
  95   reply_context.params.set_result(PP_OK);
  96   host()->SendReply(reply_context, PpapiPluginMsg_VideoSource_OpenReply());
  97   return PP_OK_COMPLETIONPENDING;
  98 }
  99
 100 int32_t PepperVideoSourceHost::OnHostMsgGetFrame(HostMessageContext* context) {
 101   if (!source_handler_.get())
 102     return PP_ERROR_FAILED;
 103   if (get_frame_pending_)
 104     return PP_ERROR_INPROGRESS;
 105
 106   reply_context_ = context->MakeReplyMessageContext();
 107   get_frame_pending_ = true;
 108
 109   // If a frame is ready, try to convert it and send the reply.
 110   if (last_frame_.get())
 111     SendGetFrameReply();
 112
 113   return PP_OK_COMPLETIONPENDING;
 114 }
 115
 116 int32_t PepperVideoSourceHost::OnHostMsgClose(HostMessageContext* context) {
 117   Close();
 118   return PP_OK;
 119 }
 120
 121 void PepperVideoSourceHost::SendGetFrameReply() {
 122   DCHECK(get_frame_pending_);
 123   get_frame_pending_ = false;
 124
 125   DCHECK(last_frame_.get());
 126   scoped_refptr<media::VideoFrame> frame(last_frame_);
 127   last_frame_ = NULL;
 128
 129   const int dst_width = frame->visible_rect().width();
 130   const int dst_height = frame->visible_rect().height();
 131
 132   PP_ImageDataDesc image_desc;
 133   IPC::PlatformFileForTransit image_handle;
 134   uint32_t byte_count;
 135   ppapi::ScopedPPResource resource(
 136       ppapi::ScopedPPResource::PassRef(),
 137       ppapi::proxy::PPB_ImageData_Proxy::CreateImageData(
 138           pp_instance(),
 139           ppapi::PPB_ImageData_Shared::SIMPLE,
 140           PP_IMAGEDATAFORMAT_BGRA_PREMUL,
 141           PP_MakeSize(dst_width, dst_height),
 142           false /* init_to_zero */,
 143           &image_desc,
 144           &image_handle,
 145           &byte_count));
 146   if (!resource.get()) {
 147     SendGetFrameErrorReply(PP_ERROR_FAILED);
 148     return;
 149   }
 150
 151   ppapi::thunk::EnterResourceNoLock<ppapi::thunk::PPB_ImageData_API>
 152       enter_resource(resource, false);
 153   if (enter_resource.failed()) {
 154     SendGetFrameErrorReply(PP_ERROR_FAILED);
 155     return;
 156   }
 157
 158   PPB_ImageData_Impl* image_data =
 159       static_cast<PPB_ImageData_Impl*>(enter_resource.object());
 160   ImageDataAutoMapper mapper(image_data);
 161   if (!mapper.is_valid()) {
 162     SendGetFrameErrorReply(PP_ERROR_FAILED);
 163     return;
 164   }
 165
 166   const SkBitmap* bitmap = image_data->GetMappedBitmap();
 167   if (!bitmap) {
 168     SendGetFrameErrorReply(PP_ERROR_FAILED);
 169     return;
 170   }
 171   uint8_t* bitmap_pixels = static_cast<uint8_t*>(bitmap->getPixels());
 172   if (!bitmap_pixels) {
 173     SendGetFrameErrorReply(PP_ERROR_FAILED);
 174     return;
 175   }
 176
 177   // Calculate that portion of the |frame| that should be copied into
 178   // |bitmap|. If |frame| has been cropped,
 179   // frame->coded_size() != frame->visible_rect().
 180   const int src_width = frame->coded_size().width();
 181   const int src_height = frame->coded_size().height();
 182   DCHECK(src_width >= dst_width && src_height >= dst_height);
 183
 184   const int horiz_crop = frame->visible_rect().x();
 185   const int vert_crop = frame->visible_rect().y();
 186
 187   const uint8* src_y = frame->data(media::VideoFrame::kYPlane) +
 188                        (src_width * vert_crop + horiz_crop);
 189   const int center = (src_width + 1) / 2;
 190   const uint8* src_u = frame->data(media::VideoFrame::kUPlane) +
 191                        (center * vert_crop + horiz_crop) / 2;
 192   const uint8* src_v = frame->data(media::VideoFrame::kVPlane) +
 193                        (center * vert_crop + horiz_crop) / 2;
 194
 195   libyuv::I420ToBGRA(src_y,
 196                      frame->stride(media::VideoFrame::kYPlane),
 197                      src_u,
 198                      frame->stride(media::VideoFrame::kUPlane),
 199                      src_v,
 200                      frame->stride(media::VideoFrame::kVPlane),
 201                      bitmap_pixels,
 202                      bitmap->rowBytes(),
 203                      dst_width,
 204                      dst_height);
 205
 206   ppapi::HostResource host_resource;
 207   host_resource.SetHostResource(pp_instance(), resource.get());
 208
 209   // Convert a video timestamp to a PP_TimeTicks (a double, in seconds).
 210   PP_TimeTicks timestamp = frame->timestamp().InSecondsF();
 211
 212   ppapi::proxy::SerializedHandle serialized_handle;
 213   serialized_handle.set_shmem(image_handle, byte_count);
 214   reply_context_.params.AppendHandle(serialized_handle);
 215
 216   host()->SendReply(reply_context_,
 217                     PpapiPluginMsg_VideoSource_GetFrameReply(
 218                         host_resource, image_desc, timestamp));
 219
 220   reply_context_ = ppapi::host::ReplyMessageContext();
 221
 222   // Keep a reference once we know this method succeeds.
 223   resource.Release();
 224 }
 225
 226 void PepperVideoSourceHost::SendGetFrameErrorReply(int32_t error) {
 227   reply_context_.params.set_result(error);
 228   host()->SendReply(
 229       reply_context_,
 230       PpapiPluginMsg_VideoSource_GetFrameReply(
 231           ppapi::HostResource(), PP_ImageDataDesc(), 0.0 /* timestamp */));
 232   reply_context_ = ppapi::host::ReplyMessageContext();
 233 }
 234
 235 void PepperVideoSourceHost::Close() {
 236   if (source_handler_.get() && !stream_url_.empty())
 237     source_handler_->Close(frame_receiver_.get());
 238
 239   source_handler_.reset(NULL);
 240   stream_url_.clear();
 241 }
 242
 243 }  // namespace content