src/content/renderer/media/rtc_video_encoder.cc

   1 // Copyright 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/rtc_video_encoder.h"
   6
   7 #include "base/bind.h"
   8 #include "base/location.h"
   9 #include "base/logging.h"
  10 #include "base/memory/scoped_vector.h"
  11 #include "base/message_loop/message_loop_proxy.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/synchronization/waitable_event.h"
  14 #include "content/renderer/media/renderer_gpu_video_accelerator_factories.h"
  15 #include "media/base/bitstream_buffer.h"
  16 #include "media/base/video_frame.h"
  17 #include "media/base/video_util.h"
  18 #include "media/filters/gpu_video_accelerator_factories.h"
  19 #include "media/video/video_encode_accelerator.h"
  20 #include "third_party/webrtc/system_wrappers/interface/tick_util.h"
  21
  22 #define NOTIFY_ERROR(x)                             \
  23   do {                                              \
  24     DLOG(ERROR) << "calling NotifyError(): " << x;  \
  25     NotifyError(x);                                 \
  26   } while (0)
  27
  28 namespace content {
  29
  30 // This private class of RTCVideoEncoder does the actual work of communicating
  31 // with a media::VideoEncodeAccelerator for handling video encoding.  It can
  32 // be created on any thread, but should subsequently be posted to (and Destroy()
  33 // called on) a single thread.  Callbacks to RTCVideoEncoder are posted to the
  34 // thread on which the instance was constructed.
  35 //
  36 // This class separates state related to the thread that RTCVideoEncoder
  37 // operates on (presently the libjingle worker thread) from the thread that
  38 // |gpu_factories_| provides for accelerator operations (presently the media
  39 // thread).  The RTCVideoEncoder class can be deleted directly by WebRTC, while
  40 // RTCVideoEncoder::Impl stays around long enough to properly shut down the VEA.
  41 class RTCVideoEncoder::Impl
  42     : public media::VideoEncodeAccelerator::Client,
  43       public base::RefCountedThreadSafe<RTCVideoEncoder::Impl> {
  44  public:
  45   Impl(
  46       const base::WeakPtr<RTCVideoEncoder>& weak_encoder,
  47       const scoped_refptr<RendererGpuVideoAcceleratorFactories>& gpu_factories);
  48
  49   // Create the VEA and call Initialize() on it.  Called once per instantiation,
  50   // and then the instance is bound forevermore to whichever thread made the
  51   // call.
  52   // RTCVideoEncoder expects to be able to call this function synchronously from
  53   // its own thread, hence the |async_waiter| and |async_retval| arguments.
  54   void CreateAndInitializeVEA(const gfx::Size& input_visible_size,
  55                               uint32 bitrate,
  56                               media::VideoCodecProfile profile,
  57                               base::WaitableEvent* async_waiter,
  58                               int32_t* async_retval);
  59   // Enqueue a frame from WebRTC for encoding.
  60   // RTCVideoEncoder expects to be able to call this function synchronously from
  61   // its own thread, hence the |async_waiter| and |async_retval| arguments.
  62   void Enqueue(const webrtc::I420VideoFrame* input_frame,
  63                bool force_keyframe,
  64                base::WaitableEvent* async_waiter,
  65                int32_t* async_retval);
  66
  67   // RTCVideoEncoder is given a buffer to be passed to WebRTC through the
  68   // RTCVideoEncoder::ReturnEncodedImage() function.  When that is complete,
  69   // the buffer is returned to Impl by its index using this function.
  70   void UseOutputBitstreamBufferId(int32 bitstream_buffer_id);
  71
  72   // Request encoding parameter change for the underlying encoder.
  73   void RequestEncodingParametersChange(uint32 bitrate, uint32 framerate);
  74
  75   // Destroy this Impl's encoder.  The destructor is not explicitly called, as
  76   // Impl is a base::RefCountedThreadSafe.
  77   void Destroy();
  78
  79   // media::VideoEncodeAccelerator::Client implementation.
  80   virtual void NotifyInitializeDone() OVERRIDE;
  81   virtual void RequireBitstreamBuffers(unsigned int input_count,
  82                                        const gfx::Size& input_coded_size,
  83                                        size_t output_buffer_size) OVERRIDE;
  84   virtual void BitstreamBufferReady(int32 bitstream_buffer_id,
  85                                     size_t payload_size,
  86                                     bool key_frame) OVERRIDE;
  87   virtual void NotifyError(media::VideoEncodeAccelerator::Error error) OVERRIDE;
  88
  89  private:
  90   friend class base::RefCountedThreadSafe<Impl>;
  91
  92   enum {
  93     kInputBufferExtraCount = 1,  // The number of input buffers allocated, more
  94                                  // than what is requested by
  95                                  // VEA::RequireBitstreamBuffers().
  96     kOutputBufferCount = 3,
  97   };
  98
  99   virtual ~Impl();
 100
 101   // Perform encoding on an input frame from the input queue.
 102   void EncodeOneFrame();
 103
 104   // Notify that an input frame is finished for encoding.  |index| is the index
 105   // of the completed frame in |input_buffers_|.
 106   void EncodeFrameFinished(int index);
 107
 108   // Set up/signal |async_waiter_| and |async_retval_|; see declarations below.
 109   void RegisterAsyncWaiter(base::WaitableEvent* waiter, int32_t* retval);
 110   void SignalAsyncWaiter(int32_t retval);
 111
 112   base::ThreadChecker thread_checker_;
 113
 114   // Weak pointer to the parent RTCVideoEncoder, for posting back VEA::Client
 115   // notifications.
 116   const base::WeakPtr<RTCVideoEncoder> weak_encoder_;
 117
 118   // The message loop on which to post callbacks to |weak_encoder_|.
 119   const scoped_refptr<base::MessageLoopProxy> encoder_message_loop_proxy_;
 120
 121   // Factory for creating VEAs, shared memory buffers, etc.
 122   const scoped_refptr<RendererGpuVideoAcceleratorFactories> gpu_factories_;
 123
 124   // webrtc::VideoEncoder expects InitEncode() and Encode() to be synchronous.
 125   // Do this by waiting on the |async_waiter_| and returning the return value in
 126   // |async_retval_| when initialization completes, encoding completes, or
 127   // an error occurs.
 128   base::WaitableEvent* async_waiter_;
 129   int32_t* async_retval_;
 130
 131   // The underlying VEA to perform encoding on.
 132   scoped_ptr<media::VideoEncodeAccelerator> video_encoder_;
 133
 134   // Next input frame.  Since there is at most one next frame, a single-element
 135   // queue is sufficient.
 136   const webrtc::I420VideoFrame* input_next_frame_;
 137
 138   // Whether to encode a keyframe next.
 139   bool input_next_frame_keyframe_;
 140
 141   // Frame sizes.
 142   gfx::Size input_frame_coded_size_;
 143   gfx::Size input_visible_size_;
 144
 145   // Shared memory buffers for input/output with the VEA.
 146   ScopedVector<base::SharedMemory> input_buffers_;
 147   ScopedVector<base::SharedMemory> output_buffers_;
 148
 149   // Input buffers ready to be filled with input from Encode().  As a LIFO since
 150   // we don't care about ordering.
 151   std::vector<int> input_buffers_free_;
 152
 153   DISALLOW_COPY_AND_ASSIGN(Impl);
 154 };
 155
 156 RTCVideoEncoder::Impl::Impl(
 157     const base::WeakPtr<RTCVideoEncoder>& weak_encoder,
 158     const scoped_refptr<RendererGpuVideoAcceleratorFactories>& gpu_factories)
 159     : weak_encoder_(weak_encoder),
 160       encoder_message_loop_proxy_(base::MessageLoopProxy::current()),
 161       gpu_factories_(gpu_factories),
 162       async_waiter_(NULL),
 163       async_retval_(NULL),
 164       input_next_frame_(NULL),
 165       input_next_frame_keyframe_(false) {
 166   thread_checker_.DetachFromThread();
 167 }
 168
 169 void RTCVideoEncoder::Impl::CreateAndInitializeVEA(
 170     const gfx::Size& input_visible_size,
 171     uint32 bitrate,
 172     media::VideoCodecProfile profile,
 173     base::WaitableEvent* async_waiter,
 174     int32_t* async_retval) {
 175   DVLOG(3) << "Impl::CreateAndInitializeVEA()";
 176   DCHECK(thread_checker_.CalledOnValidThread());
 177
 178   RegisterAsyncWaiter(async_waiter, async_retval);
 179
 180   // Check for overflow converting bitrate (kilobits/sec) to bits/sec.
 181   if (bitrate > kuint32max / 1000) {
 182     NOTIFY_ERROR(media::VideoEncodeAccelerator::kInvalidArgumentError);
 183     return;
 184   }
 185
 186   video_encoder_ = gpu_factories_->CreateVideoEncodeAccelerator(this).Pass();
 187   if (!video_encoder_) {
 188     NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
 189     return;
 190   }
 191   input_visible_size_ = input_visible_size;
 192   video_encoder_->Initialize(
 193       media::VideoFrame::I420, input_visible_size_, profile, bitrate * 1000);
 194 }
 195
 196 void RTCVideoEncoder::Impl::Enqueue(const webrtc::I420VideoFrame* input_frame,
 197                                     bool force_keyframe,
 198                                     base::WaitableEvent* async_waiter,
 199                                     int32_t* async_retval) {
 200   DVLOG(3) << "Impl::Enqueue()";
 201   DCHECK(thread_checker_.CalledOnValidThread());
 202   DCHECK(!input_next_frame_);
 203
 204   RegisterAsyncWaiter(async_waiter, async_retval);
 205   input_next_frame_ = input_frame;
 206   input_next_frame_keyframe_ = force_keyframe;
 207
 208   if (!input_buffers_free_.empty())
 209     EncodeOneFrame();
 210 }
 211
 212 void RTCVideoEncoder::Impl::UseOutputBitstreamBufferId(
 213     int32 bitstream_buffer_id) {
 214   DVLOG(3) << "Impl::UseOutputBitstreamBufferIndex(): "
 215               "bitstream_buffer_id=" << bitstream_buffer_id;
 216   DCHECK(thread_checker_.CalledOnValidThread());
 217   if (video_encoder_) {
 218     video_encoder_->UseOutputBitstreamBuffer(media::BitstreamBuffer(
 219         bitstream_buffer_id,
 220         output_buffers_[bitstream_buffer_id]->handle(),
 221         output_buffers_[bitstream_buffer_id]->mapped_size()));
 222   }
 223 }
 224
 225 void RTCVideoEncoder::Impl::RequestEncodingParametersChange(uint32 bitrate,
 226                                                             uint32 framerate) {
 227   DVLOG(3) << "Impl::RequestEncodingParametersChange(): bitrate=" << bitrate
 228            << ", framerate=" << framerate;
 229   DCHECK(thread_checker_.CalledOnValidThread());
 230
 231   // Check for overflow converting bitrate (kilobits/sec) to bits/sec.
 232   if (bitrate > kuint32max / 1000) {
 233     NOTIFY_ERROR(media::VideoEncodeAccelerator::kInvalidArgumentError);
 234     return;
 235   }
 236
 237   if (video_encoder_)
 238     video_encoder_->RequestEncodingParametersChange(bitrate * 1000, framerate);
 239 }
 240
 241 void RTCVideoEncoder::Impl::Destroy() {
 242   DVLOG(3) << "Impl::Destroy()";
 243   DCHECK(thread_checker_.CalledOnValidThread());
 244   if (video_encoder_)
 245     video_encoder_.release()->Destroy();
 246 }
 247
 248 void RTCVideoEncoder::Impl::NotifyInitializeDone() {
 249   DVLOG(3) << "Impl::NotifyInitializeDone()";
 250   DCHECK(thread_checker_.CalledOnValidThread());
 251 }
 252
 253 void RTCVideoEncoder::Impl::RequireBitstreamBuffers(
 254     unsigned int input_count,
 255     const gfx::Size& input_coded_size,
 256     size_t output_buffer_size) {
 257   DVLOG(3) << "Impl::RequireBitstreamBuffers(): input_count=" << input_count
 258            << ", input_coded_size=" << input_coded_size.ToString()
 259            << ", output_buffer_size=" << output_buffer_size;
 260   DCHECK(thread_checker_.CalledOnValidThread());
 261
 262   if (!video_encoder_)
 263     return;
 264
 265   input_frame_coded_size_ = input_coded_size;
 266
 267   for (unsigned int i = 0; i < input_count + kInputBufferExtraCount; ++i) {
 268     base::SharedMemory* shm =
 269         gpu_factories_->CreateSharedMemory(media::VideoFrame::AllocationSize(
 270             media::VideoFrame::I420, input_coded_size));
 271     if (!shm) {
 272       DLOG(ERROR) << "Impl::RequireBitstreamBuffers(): "
 273                      "failed to create input buffer " << i;
 274       NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
 275       return;
 276     }
 277     input_buffers_.push_back(shm);
 278     input_buffers_free_.push_back(i);
 279   }
 280
 281   for (int i = 0; i < kOutputBufferCount; ++i) {
 282     base::SharedMemory* shm =
 283         gpu_factories_->CreateSharedMemory(output_buffer_size);
 284     if (!shm) {
 285       DLOG(ERROR) << "Impl::RequireBitstreamBuffers(): "
 286                      "failed to create output buffer " << i;
 287       NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
 288       return;
 289     }
 290     output_buffers_.push_back(shm);
 291   }
 292
 293   // Immediately provide all output buffers to the VEA.
 294   for (size_t i = 0; i < output_buffers_.size(); ++i) {
 295     video_encoder_->UseOutputBitstreamBuffer(media::BitstreamBuffer(
 296         i, output_buffers_[i]->handle(), output_buffers_[i]->mapped_size()));
 297   }
 298   SignalAsyncWaiter(WEBRTC_VIDEO_CODEC_OK);
 299 }
 300
 301 void RTCVideoEncoder::Impl::BitstreamBufferReady(int32 bitstream_buffer_id,
 302                                                  size_t payload_size,
 303                                                  bool key_frame) {
 304   DVLOG(3) << "Impl::BitstreamBufferReady(): "
 305               "bitstream_buffer_id=" << bitstream_buffer_id
 306            << ", payload_size=" << payload_size
 307            << ", key_frame=" << key_frame;
 308   DCHECK(thread_checker_.CalledOnValidThread());
 309
 310   if (bitstream_buffer_id < 0 ||
 311       bitstream_buffer_id >= static_cast<int>(output_buffers_.size())) {
 312     DLOG(ERROR) << "Impl::BitstreamBufferReady(): invalid bitstream_buffer_id="
 313                 << bitstream_buffer_id;
 314     NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
 315     return;
 316   }
 317   base::SharedMemory* output_buffer = output_buffers_[bitstream_buffer_id];
 318   if (payload_size > output_buffer->mapped_size()) {
 319     DLOG(ERROR) << "Impl::BitstreamBufferReady(): invalid payload_size="
 320                 << payload_size;
 321     NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
 322     return;
 323   }
 324
 325   // Use webrtc timestamps to ensure correct RTP sender behavior.
 326   // TODO(hshi): obtain timestamp from the capturer, see crbug.com/284783.
 327   const int64 capture_time_ms = webrtc::TickTime::MillisecondTimestamp();
 328
 329   scoped_ptr<webrtc::EncodedImage> image(new webrtc::EncodedImage(
 330       reinterpret_cast<uint8_t*>(output_buffer->memory()),
 331       payload_size,
 332       output_buffer->mapped_size()));
 333   image->_encodedWidth = input_visible_size_.width();
 334   image->_encodedHeight = input_visible_size_.height();
 335   // Convert capture time to 90 kHz RTP timestamp.
 336   image->_timeStamp = static_cast<uint32_t>(90 * capture_time_ms);
 337   image->capture_time_ms_ = capture_time_ms;
 338   image->_frameType = (key_frame ? webrtc::kKeyFrame : webrtc::kDeltaFrame);
 339   image->_completeFrame = true;
 340
 341   encoder_message_loop_proxy_->PostTask(
 342       FROM_HERE,
 343       base::Bind(&RTCVideoEncoder::ReturnEncodedImage,
 344                  weak_encoder_,
 345                  base::Passed(&image),
 346                  bitstream_buffer_id));
 347 }
 348
 349 void RTCVideoEncoder::Impl::NotifyError(
 350     media::VideoEncodeAccelerator::Error error) {
 351   DVLOG(3) << "Impl::NotifyError(): error=" << error;
 352   DCHECK(thread_checker_.CalledOnValidThread());
 353   int32_t retval;
 354   switch (error) {
 355     case media::VideoEncodeAccelerator::kInvalidArgumentError:
 356       retval = WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
 357       break;
 358     default:
 359       retval = WEBRTC_VIDEO_CODEC_ERROR;
 360   }
 361
 362   if (video_encoder_)
 363     video_encoder_.release()->Destroy();
 364
 365   if (async_waiter_) {
 366     SignalAsyncWaiter(retval);
 367   } else {
 368     encoder_message_loop_proxy_->PostTask(
 369         FROM_HERE,
 370         base::Bind(&RTCVideoEncoder::NotifyError, weak_encoder_, retval));
 371   }
 372 }
 373
 374 RTCVideoEncoder::Impl::~Impl() { DCHECK(!video_encoder_); }
 375
 376 void RTCVideoEncoder::Impl::EncodeOneFrame() {
 377   DVLOG(3) << "Impl::EncodeOneFrame()";
 378   DCHECK(thread_checker_.CalledOnValidThread());
 379   DCHECK(input_next_frame_);
 380   DCHECK(!input_buffers_free_.empty());
 381
 382   // EncodeOneFrame() may re-enter EncodeFrameFinished() if VEA::Encode() fails,
 383   // we receive a VEA::NotifyError(), and the media::VideoFrame we pass to
 384   // Encode() gets destroyed early.  Handle this by resetting our
 385   // input_next_frame_* state before we hand off the VideoFrame to the VEA.
 386   const webrtc::I420VideoFrame* next_frame = input_next_frame_;
 387   bool next_frame_keyframe = input_next_frame_keyframe_;
 388   input_next_frame_ = NULL;
 389   input_next_frame_keyframe_ = false;
 390
 391   if (!video_encoder_) {
 392     SignalAsyncWaiter(WEBRTC_VIDEO_CODEC_ERROR);
 393     return;
 394   }
 395
 396   const int index = input_buffers_free_.back();
 397   base::SharedMemory* input_buffer = input_buffers_[index];
 398   scoped_refptr<media::VideoFrame> frame =
 399       media::VideoFrame::WrapExternalSharedMemory(
 400           media::VideoFrame::I420,
 401           input_frame_coded_size_,
 402           gfx::Rect(input_visible_size_),
 403           input_visible_size_,
 404           reinterpret_cast<uint8*>(input_buffer->memory()),
 405           input_buffer->mapped_size(),
 406           input_buffer->handle(),
 407           base::TimeDelta(),
 408           base::Bind(&RTCVideoEncoder::Impl::EncodeFrameFinished, this, index));
 409   if (!frame) {
 410     DLOG(ERROR) << "Impl::EncodeOneFrame(): failed to create frame";
 411     NOTIFY_ERROR(media::VideoEncodeAccelerator::kPlatformFailureError);
 412     return;
 413   }
 414
 415   // Do a strided copy of the input frame to match the input requirements for
 416   // the encoder.
 417   // TODO(sheu): support zero-copy from WebRTC.  http://crbug.com/269312
 418   media::CopyYPlane(next_frame->buffer(webrtc::kYPlane),
 419                     next_frame->stride(webrtc::kYPlane),
 420                     next_frame->height(),
 421                     frame.get());
 422   media::CopyUPlane(next_frame->buffer(webrtc::kUPlane),
 423                     next_frame->stride(webrtc::kUPlane),
 424                     next_frame->height(),
 425                     frame.get());
 426   media::CopyVPlane(next_frame->buffer(webrtc::kVPlane),
 427                     next_frame->stride(webrtc::kVPlane),
 428                     next_frame->height(),
 429                     frame.get());
 430
 431   video_encoder_->Encode(frame, next_frame_keyframe);
 432   input_buffers_free_.pop_back();
 433   SignalAsyncWaiter(WEBRTC_VIDEO_CODEC_OK);
 434 }
 435
 436 void RTCVideoEncoder::Impl::EncodeFrameFinished(int index) {
 437   DVLOG(3) << "Impl::EncodeFrameFinished(): index=" << index;
 438   DCHECK(thread_checker_.CalledOnValidThread());
 439   DCHECK_GE(index, 0);
 440   DCHECK_LT(index, static_cast<int>(input_buffers_.size()));
 441   input_buffers_free_.push_back(index);
 442   if (input_next_frame_)
 443     EncodeOneFrame();
 444 }
 445
 446 void RTCVideoEncoder::Impl::RegisterAsyncWaiter(base::WaitableEvent* waiter,
 447                                                 int32_t* retval) {
 448   DCHECK(thread_checker_.CalledOnValidThread());
 449   DCHECK(!async_waiter_);
 450   DCHECK(!async_retval_);
 451   async_waiter_ = waiter;
 452   async_retval_ = retval;
 453 }
 454
 455 void RTCVideoEncoder::Impl::SignalAsyncWaiter(int32_t retval) {
 456   DCHECK(thread_checker_.CalledOnValidThread());
 457   *async_retval_ = retval;
 458   async_waiter_->Signal();
 459   async_retval_ = NULL;
 460   async_waiter_ = NULL;
 461 }
 462
 463 #undef NOTIFY_ERROR
 464
 465 ////////////////////////////////////////////////////////////////////////////////
 466 //
 467 // RTCVideoEncoder
 468 //
 469 ////////////////////////////////////////////////////////////////////////////////
 470
 471 RTCVideoEncoder::RTCVideoEncoder(
 472     webrtc::VideoCodecType type,
 473     media::VideoCodecProfile profile,
 474     const scoped_refptr<RendererGpuVideoAcceleratorFactories>& gpu_factories)
 475     : video_codec_type_(type),
 476       video_codec_profile_(profile),
 477       gpu_factories_(gpu_factories),
 478       weak_this_factory_(this),
 479       encoded_image_callback_(NULL),
 480       impl_status_(WEBRTC_VIDEO_CODEC_UNINITIALIZED) {
 481   DVLOG(1) << "RTCVideoEncoder(): profile=" << profile;
 482 }
 483
 484 RTCVideoEncoder::~RTCVideoEncoder() {
 485   DCHECK(thread_checker_.CalledOnValidThread());
 486   Release();
 487   DCHECK(!impl_);
 488 }
 489
 490 int32_t RTCVideoEncoder::InitEncode(const webrtc::VideoCodec* codec_settings,
 491                                     int32_t number_of_cores,
 492                                     uint32_t max_payload_size) {
 493   DVLOG(1) << "InitEncode(): codecType=" << codec_settings->codecType
 494            << ", width=" << codec_settings->width
 495            << ", height=" << codec_settings->height
 496            << ", startBitrate=" << codec_settings->startBitrate;
 497   DCHECK(thread_checker_.CalledOnValidThread());
 498   DCHECK(!impl_);
 499
 500   weak_this_factory_.InvalidateWeakPtrs();
 501   impl_ = new Impl(weak_this_factory_.GetWeakPtr(), gpu_factories_);
 502   base::WaitableEvent initialization_waiter(true, false);
 503   int32_t initialization_retval = WEBRTC_VIDEO_CODEC_UNINITIALIZED;
 504   gpu_factories_->GetMessageLoop()->PostTask(
 505       FROM_HERE,
 506       base::Bind(&RTCVideoEncoder::Impl::CreateAndInitializeVEA,
 507                  impl_,
 508                  gfx::Size(codec_settings->width, codec_settings->height),
 509                  codec_settings->startBitrate,
 510                  video_codec_profile_,
 511                  &initialization_waiter,
 512                  &initialization_retval));
 513
 514   // webrtc::VideoEncoder expects this call to be synchronous.
 515   initialization_waiter.Wait();
 516   RecordInitEncodeUMA(initialization_retval);
 517   return initialization_retval;
 518 }
 519
 520 int32_t RTCVideoEncoder::Encode(
 521     const webrtc::I420VideoFrame& input_image,
 522     const webrtc::CodecSpecificInfo* codec_specific_info,
 523     const std::vector<webrtc::VideoFrameType>* frame_types) {
 524   DVLOG(3) << "Encode()";
 525   // TODO(sheu): figure out why this check fails.
 526   // DCHECK(thread_checker_.CalledOnValidThread());
 527   if (!impl_) {
 528     DVLOG(3) << "Encode(): returning impl_status_=" << impl_status_;
 529     return impl_status_;
 530   }
 531
 532   base::WaitableEvent encode_waiter(true, false);
 533   int32_t encode_retval = WEBRTC_VIDEO_CODEC_UNINITIALIZED;
 534   gpu_factories_->GetMessageLoop()->PostTask(
 535       FROM_HERE,
 536       base::Bind(&RTCVideoEncoder::Impl::Enqueue,
 537                  impl_,
 538                  &input_image,
 539                  (frame_types->front() == webrtc::kKeyFrame),
 540                  &encode_waiter,
 541                  &encode_retval));
 542
 543   // webrtc::VideoEncoder expects this call to be synchronous.
 544   encode_waiter.Wait();
 545   DVLOG(3) << "Encode(): returning encode_retval=" << encode_retval;
 546   return encode_retval;
 547 }
 548
 549 int32_t RTCVideoEncoder::RegisterEncodeCompleteCallback(
 550     webrtc::EncodedImageCallback* callback) {
 551   DVLOG(3) << "RegisterEncodeCompleteCallback()";
 552   DCHECK(thread_checker_.CalledOnValidThread());
 553   if (!impl_) {
 554     DVLOG(3) << "RegisterEncodeCompleteCallback(): returning " << impl_status_;
 555     return impl_status_;
 556   }
 557
 558   encoded_image_callback_ = callback;
 559   return WEBRTC_VIDEO_CODEC_OK;
 560 }
 561
 562 int32_t RTCVideoEncoder::Release() {
 563   DVLOG(3) << "Release()";
 564   DCHECK(thread_checker_.CalledOnValidThread());
 565
 566   // Reset the gpu_factory_, in case we reuse this encoder.
 567   gpu_factories_->Abort();
 568   gpu_factories_ = gpu_factories_->Clone();
 569   if (impl_) {
 570     gpu_factories_->GetMessageLoop()->PostTask(
 571         FROM_HERE, base::Bind(&RTCVideoEncoder::Impl::Destroy, impl_));
 572     impl_ = NULL;
 573     weak_this_factory_.InvalidateWeakPtrs();
 574     impl_status_ = WEBRTC_VIDEO_CODEC_UNINITIALIZED;
 575   }
 576   return WEBRTC_VIDEO_CODEC_OK;
 577 }
 578
 579 int32_t RTCVideoEncoder::SetChannelParameters(uint32_t packet_loss, int rtt) {
 580   DVLOG(3) << "SetChannelParameters(): packet_loss=" << packet_loss
 581            << ", rtt=" << rtt;
 582   DCHECK(thread_checker_.CalledOnValidThread());
 583   // Ignored.
 584   return WEBRTC_VIDEO_CODEC_OK;
 585 }
 586
 587 int32_t RTCVideoEncoder::SetRates(uint32_t new_bit_rate, uint32_t frame_rate) {
 588   DVLOG(3) << "SetRates(): new_bit_rate=" << new_bit_rate
 589            << ", frame_rate=" << frame_rate;
 590   DCHECK(thread_checker_.CalledOnValidThread());
 591   if (!impl_) {
 592     DVLOG(3) << "SetRates(): returning " << impl_status_;
 593     return impl_status_;
 594   }
 595
 596   gpu_factories_->GetMessageLoop()->PostTask(
 597       FROM_HERE,
 598       base::Bind(&RTCVideoEncoder::Impl::RequestEncodingParametersChange,
 599                  impl_,
 600                  new_bit_rate,
 601                  frame_rate));
 602   return WEBRTC_VIDEO_CODEC_OK;
 603 }
 604
 605 void RTCVideoEncoder::ReturnEncodedImage(scoped_ptr<webrtc::EncodedImage> image,
 606                                          int32 bitstream_buffer_id) {
 607   DCHECK(thread_checker_.CalledOnValidThread());
 608   DVLOG(3) << "ReturnEncodedImage(): "
 609               "bitstream_buffer_id=" << bitstream_buffer_id;
 610
 611   if (!encoded_image_callback_)
 612     return;
 613
 614   webrtc::CodecSpecificInfo info;
 615   memset(&info, 0, sizeof(info));
 616   info.codecType = video_codec_type_;
 617   if (video_codec_type_ == webrtc::kVideoCodecVP8) {
 618     info.codecSpecific.VP8.pictureId = -1;
 619     info.codecSpecific.VP8.tl0PicIdx = -1;
 620     info.codecSpecific.VP8.keyIdx = -1;
 621   }
 622
 623   // Generate a header describing a single fragment.
 624   webrtc::RTPFragmentationHeader header;
 625   memset(&header, 0, sizeof(header));
 626   header.VerifyAndAllocateFragmentationHeader(1);
 627   header.fragmentationOffset[0] = 0;
 628   header.fragmentationLength[0] = image->_length;
 629   header.fragmentationPlType[0] = 0;
 630   header.fragmentationTimeDiff[0] = 0;
 631
 632   int32_t retval = encoded_image_callback_->Encoded(*image, &info, &header);
 633   if (retval < 0) {
 634     DVLOG(2) << "ReturnEncodedImage(): encoded_image_callback_ returned "
 635              << retval;
 636   }
 637
 638   // The call through webrtc::EncodedImageCallback is synchronous, so we can
 639   // immediately recycle the output buffer back to the Impl.
 640   gpu_factories_->GetMessageLoop()->PostTask(
 641       FROM_HERE,
 642       base::Bind(&RTCVideoEncoder::Impl::UseOutputBitstreamBufferId,
 643                  impl_,
 644                  bitstream_buffer_id));
 645 }
 646
 647 void RTCVideoEncoder::NotifyError(int32_t error) {
 648   DCHECK(thread_checker_.CalledOnValidThread());
 649   DVLOG(1) << "NotifyError(): error=" << error;
 650
 651   impl_status_ = error;
 652   gpu_factories_->GetMessageLoop()->PostTask(
 653       FROM_HERE, base::Bind(&RTCVideoEncoder::Impl::Destroy, impl_));
 654   impl_ = NULL;
 655 }
 656
 657 void RTCVideoEncoder::RecordInitEncodeUMA(int32_t init_retval) {
 658   UMA_HISTOGRAM_BOOLEAN("Media.RTCVideoEncoderInitEncodeSuccess",
 659                         init_retval == WEBRTC_VIDEO_CODEC_OK);
 660   if (init_retval == WEBRTC_VIDEO_CODEC_OK) {
 661     UMA_HISTOGRAM_ENUMERATION("Media.RTCVideoEncoderProfile",
 662                               video_codec_profile_,
 663                               media::VIDEO_CODEC_PROFILE_MAX);
 664   }
 665 }
 666
 667 }  // namespace content