src/content/renderer/media/webrtc/video_destination_handler.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/media/webrtc/video_destination_handler.h"
   6
   7 #include <string>
   8
   9 #include "base/base64.h"
  10 #include "base/debug/trace_event.h"
  11 #include "base/logging.h"
  12 #include "base/rand_util.h"
  13 #include "base/strings/utf_string_conversions.h"
  14 #include "content/renderer/media/media_stream.h"
  15 #include "content/renderer/media/media_stream_registry_interface.h"
  16 #include "content/renderer/media/media_stream_video_track.h"
  17 #include "content/renderer/pepper/ppb_image_data_impl.h"
  18 #include "content/renderer/render_thread_impl.h"
  19 #include "media/video/capture/video_capture_types.h"
  20 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
  21 #include "third_party/WebKit/public/platform/WebURL.h"
  22 #include "third_party/WebKit/public/web/WebMediaStreamRegistry.h"
  23 #include "third_party/libyuv/include/libyuv/convert.h"
  24 #include "url/gurl.h"
  25
  26 namespace content {
  27
  28 class PpFrameWriter::FrameWriterDelegate
  29     : public base::RefCountedThreadSafe<FrameWriterDelegate> {
  30  public:
  31   FrameWriterDelegate(
  32       const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy,
  33       const VideoCaptureDeliverFrameCB& new_frame_callback);
  34
  35   void DeliverFrame(const scoped_refptr<media::VideoFrame>& frame,
  36                     const media::VideoCaptureFormat& format);
  37  private:
  38   friend class base::RefCountedThreadSafe<FrameWriterDelegate>;
  39   virtual ~FrameWriterDelegate();
  40
  41   void DeliverFrameOnIO(const scoped_refptr<media::VideoFrame>& frame,
  42                         const media::VideoCaptureFormat& format);
  43
  44   scoped_refptr<base::MessageLoopProxy> io_message_loop_;
  45   VideoCaptureDeliverFrameCB new_frame_callback_;
  46 };
  47
  48 PpFrameWriter::FrameWriterDelegate::FrameWriterDelegate(
  49     const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy,
  50     const VideoCaptureDeliverFrameCB& new_frame_callback)
  51     : io_message_loop_(io_message_loop_proxy),
  52       new_frame_callback_(new_frame_callback) {
  53 }
  54
  55 PpFrameWriter::FrameWriterDelegate::~FrameWriterDelegate() {
  56 }
  57
  58 void PpFrameWriter::FrameWriterDelegate::DeliverFrame(
  59     const scoped_refptr<media::VideoFrame>& frame,
  60     const media::VideoCaptureFormat& format) {
  61   io_message_loop_->PostTask(
  62       FROM_HERE,
  63       base::Bind(&FrameWriterDelegate::DeliverFrameOnIO,
  64                  this, frame, format));
  65 }
  66
  67 void PpFrameWriter::FrameWriterDelegate::DeliverFrameOnIO(
  68      const scoped_refptr<media::VideoFrame>& frame,
  69      const media::VideoCaptureFormat& format) {
  70   DCHECK(io_message_loop_->BelongsToCurrentThread());
  71   // The local time when this frame is generated is unknown so give a null
  72   // value to |estimated_capture_time|.
  73   new_frame_callback_.Run(frame, format, base::TimeTicks());
  74 }
  75
  76 PpFrameWriter::PpFrameWriter() {
  77   DVLOG(3) << "PpFrameWriter ctor";
  78 }
  79
  80 PpFrameWriter::~PpFrameWriter() {
  81   DVLOG(3) << "PpFrameWriter dtor";
  82 }
  83
  84 void PpFrameWriter::GetCurrentSupportedFormats(
  85     int max_requested_width,
  86     int max_requested_height,
  87     double max_requested_frame_rate,
  88     const VideoCaptureDeviceFormatsCB& callback) {
  89   DCHECK(CalledOnValidThread());
  90   DVLOG(3) << "PpFrameWriter::GetCurrentSupportedFormats()";
  91   // Since the input is free to change the resolution at any point in time
  92   // the supported formats are unknown.
  93   media::VideoCaptureFormats formats;
  94   callback.Run(formats);
  95 }
  96
  97 void PpFrameWriter::StartSourceImpl(
  98     const media::VideoCaptureFormat& format,
  99     const VideoCaptureDeliverFrameCB& frame_callback) {
 100   DCHECK(CalledOnValidThread());
 101   DCHECK(!delegate_.get());
 102   DVLOG(3) << "PpFrameWriter::StartSourceImpl()";
 103   delegate_ = new FrameWriterDelegate(io_message_loop(), frame_callback);
 104   OnStartDone(MEDIA_DEVICE_OK);
 105 }
 106
 107 void PpFrameWriter::StopSourceImpl() {
 108   DCHECK(CalledOnValidThread());
 109 }
 110
 111 // Note: PutFrame must copy or process image_data directly in this function,
 112 // because it may be overwritten as soon as we return from this function.
 113 void PpFrameWriter::PutFrame(PPB_ImageData_Impl* image_data,
 114                              int64 time_stamp_ns) {
 115   DCHECK(CalledOnValidThread());
 116   TRACE_EVENT0("video", "PpFrameWriter::PutFrame");
 117   DVLOG(3) << "PpFrameWriter::PutFrame()";
 118
 119   if (!image_data) {
 120     LOG(ERROR) << "PpFrameWriter::PutFrame - Called with NULL image_data.";
 121     return;
 122   }
 123   ImageDataAutoMapper mapper(image_data);
 124   if (!mapper.is_valid()) {
 125     LOG(ERROR) << "PpFrameWriter::PutFrame - "
 126                << "The image could not be mapped and is unusable.";
 127     return;
 128   }
 129   const SkBitmap* bitmap = image_data->GetMappedBitmap();
 130   if (!bitmap) {
 131     LOG(ERROR) << "PpFrameWriter::PutFrame - "
 132                << "The image_data's mapped bitmap is NULL.";
 133     return;
 134   }
 135
 136   const uint8* src_data = static_cast<uint8*>(bitmap->getPixels());
 137   const int src_stride = static_cast<int>(bitmap->rowBytes());
 138   const int width = bitmap->width();
 139   const int height = bitmap->height();
 140
 141   // We only support PP_IMAGEDATAFORMAT_BGRA_PREMUL at the moment.
 142   DCHECK(image_data->format() == PP_IMAGEDATAFORMAT_BGRA_PREMUL);
 143
 144   const gfx::Size frame_size(width, height);
 145
 146   if (state() != MediaStreamVideoSource::STARTED)
 147     return;
 148
 149   const base::TimeDelta timestamp = base::TimeDelta::FromMicroseconds(
 150       time_stamp_ns / base::Time::kNanosecondsPerMicrosecond);
 151
 152   scoped_refptr<media::VideoFrame> new_frame =
 153       frame_pool_.CreateFrame(media::VideoFrame::YV12, frame_size,
 154                               gfx::Rect(frame_size), frame_size, timestamp);
 155   media::VideoCaptureFormat format(
 156       frame_size,
 157       MediaStreamVideoSource::kUnknownFrameRate,
 158       media::PIXEL_FORMAT_YV12);
 159
 160   libyuv::ARGBToI420(src_data,
 161                      src_stride,
 162                      new_frame->data(media::VideoFrame::kYPlane),
 163                      new_frame->stride(media::VideoFrame::kYPlane),
 164                      new_frame->data(media::VideoFrame::kUPlane),
 165                      new_frame->stride(media::VideoFrame::kUPlane),
 166                      new_frame->data(media::VideoFrame::kVPlane),
 167                      new_frame->stride(media::VideoFrame::kVPlane),
 168                      width,
 169                      height);
 170
 171   delegate_->DeliverFrame(new_frame, format);
 172 }
 173
 174 // PpFrameWriterProxy is a helper class to make sure the user won't use
 175 // PpFrameWriter after it is released (IOW its owner - WebMediaStreamSource -
 176 // is released).
 177 class PpFrameWriterProxy : public FrameWriterInterface {
 178  public:
 179   explicit PpFrameWriterProxy(const base::WeakPtr<PpFrameWriter>& writer)
 180       : writer_(writer) {
 181     DCHECK(writer_ != NULL);
 182   }
 183
 184   virtual ~PpFrameWriterProxy() {}
 185
 186   virtual void PutFrame(PPB_ImageData_Impl* image_data,
 187                         int64 time_stamp_ns) override {
 188     writer_->PutFrame(image_data, time_stamp_ns);
 189   }
 190
 191  private:
 192   base::WeakPtr<PpFrameWriter> writer_;
 193
 194   DISALLOW_COPY_AND_ASSIGN(PpFrameWriterProxy);
 195 };
 196
 197 bool VideoDestinationHandler::Open(
 198     MediaStreamRegistryInterface* registry,
 199     const std::string& url,
 200     FrameWriterInterface** frame_writer) {
 201   DVLOG(3) << "VideoDestinationHandler::Open";
 202   blink::WebMediaStream stream;
 203   if (registry) {
 204     stream = registry->GetMediaStream(url);
 205   } else {
 206     stream =
 207         blink::WebMediaStreamRegistry::lookupMediaStreamDescriptor(GURL(url));
 208   }
 209   if (stream.isNull()) {
 210     LOG(ERROR) << "VideoDestinationHandler::Open - invalid url: " << url;
 211     return false;
 212   }
 213
 214   // Create a new native video track and add it to |stream|.
 215   std::string track_id;
 216   // According to spec, a media stream source's id should be unique per
 217   // application. There's no easy way to strictly achieve that. The id
 218   // generated with this method should be unique for most of the cases but
 219   // theoretically it's possible we can get an id that's duplicated with the
 220   // existing sources.
 221   base::Base64Encode(base::RandBytesAsString(64), &track_id);
 222
 223   PpFrameWriter* writer = new PpFrameWriter();
 224
 225   // Create a new webkit video track.
 226   blink::WebMediaStreamSource webkit_source;
 227   blink::WebMediaStreamSource::Type type =
 228       blink::WebMediaStreamSource::TypeVideo;
 229   blink::WebString webkit_track_id = base::UTF8ToUTF16(track_id);
 230   webkit_source.initialize(webkit_track_id, type, webkit_track_id);
 231   webkit_source.setExtraData(writer);
 232
 233   blink::WebMediaConstraints constraints;
 234   constraints.initialize();
 235   bool track_enabled = true;
 236
 237   stream.addTrack(MediaStreamVideoTrack::CreateVideoTrack(
 238       writer, constraints, MediaStreamVideoSource::ConstraintsCallback(),
 239       track_enabled));
 240
 241   *frame_writer = new PpFrameWriterProxy(writer->AsWeakPtr());
 242   return true;
 243 }
 244
 245 }  // namespace content