src/content/common/gpu/media/vaapi_video_decode_accelerator.cc

   1 // Copyright (c) 2012 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 "base/bind.h"
   6 #include "base/debug/trace_event.h"
   7 #include "base/logging.h"
   8 #include "base/metrics/histogram.h"
   9 #include "base/stl_util.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/synchronization/waitable_event.h"
  12 #include "base/threading/non_thread_safe.h"
  13 #include "content/common/gpu/gpu_channel.h"
  14 #include "content/common/gpu/media/vaapi_video_decode_accelerator.h"
  15 #include "media/base/bind_to_current_loop.h"
  16 #include "media/video/picture.h"
  17 #include "ui/gl/gl_bindings.h"
  18 #include "ui/gl/scoped_binders.h"
  19
  20 static void ReportToUMA(
  21     content::VaapiH264Decoder::VAVDAH264DecoderFailure failure) {
  22   UMA_HISTOGRAM_ENUMERATION(
  23       "Media.VAVDAH264.DecoderFailure",
  24       failure,
  25       content::VaapiH264Decoder::VAVDA_H264_DECODER_FAILURES_MAX);
  26 }
  27
  28 namespace content {
  29
  30 #define RETURN_AND_NOTIFY_ON_FAILURE(result, log, error_code, ret)  \
  31   do {                                                              \
  32     if (!(result)) {                                                \
  33       LOG(ERROR) << log;                                            \
  34       NotifyError(error_code);                                      \
  35       return ret;                                                   \
  36     }                                                               \
  37   } while (0)
  38
  39 VaapiVideoDecodeAccelerator::InputBuffer::InputBuffer() : id(0), size(0) {
  40 }
  41
  42 VaapiVideoDecodeAccelerator::InputBuffer::~InputBuffer() {
  43 }
  44
  45 void VaapiVideoDecodeAccelerator::NotifyError(Error error) {
  46   if (message_loop_ != base::MessageLoop::current()) {
  47     DCHECK(decoder_thread_proxy_->BelongsToCurrentThread());
  48     message_loop_->PostTask(FROM_HERE, base::Bind(
  49         &VaapiVideoDecodeAccelerator::NotifyError, weak_this_, error));
  50     return;
  51   }
  52
  53   // Post Cleanup() as a task so we don't recursively acquire lock_.
  54   message_loop_->PostTask(FROM_HERE, base::Bind(
  55       &VaapiVideoDecodeAccelerator::Cleanup, weak_this_));
  56
  57   LOG(ERROR) << "Notifying of error " << error;
  58   if (client_) {
  59     client_->NotifyError(error);
  60     client_ptr_factory_.reset();
  61   }
  62 }
  63
  64 // TFPPicture allocates X Pixmaps and binds them to textures passed
  65 // in PictureBuffers from clients to them. TFPPictures are created as
  66 // a consequence of receiving a set of PictureBuffers from clients and released
  67 // at the end of decode (or when a new set of PictureBuffers is required).
  68 //
  69 // TFPPictures are used for output, contents of VASurfaces passed from decoder
  70 // are put into the associated pixmap memory and sent to client.
  71 class VaapiVideoDecodeAccelerator::TFPPicture : public base::NonThreadSafe {
  72  public:
  73   ~TFPPicture();
  74
  75   static linked_ptr<TFPPicture> Create(
  76       const base::Callback<bool(void)>& make_context_current,
  77       const GLXFBConfig& fb_config,
  78       Display* x_display,
  79       int32 picture_buffer_id,
  80       uint32 texture_id,
  81       gfx::Size size);
  82
  83   int32 picture_buffer_id() {
  84     return picture_buffer_id_;
  85   }
  86
  87   gfx::Size size() {
  88     return size_;
  89   }
  90
  91   int x_pixmap() {
  92     return x_pixmap_;
  93   }
  94
  95   // Bind texture to pixmap. Needs to be called every frame.
  96   bool Bind();
  97
  98  private:
  99   TFPPicture(const base::Callback<bool(void)>& make_context_current,
 100              Display* x_display,
 101              int32 picture_buffer_id,
 102              uint32 texture_id,
 103              gfx::Size size);
 104
 105   bool Initialize(const GLXFBConfig& fb_config);
 106
 107   base::Callback<bool(void)> make_context_current_;
 108
 109   Display* x_display_;
 110
 111   // Output id for the client.
 112   int32 picture_buffer_id_;
 113   uint32 texture_id_;
 114
 115   gfx::Size size_;
 116
 117   // Pixmaps bound to this texture.
 118   Pixmap x_pixmap_;
 119   GLXPixmap glx_pixmap_;
 120
 121   DISALLOW_COPY_AND_ASSIGN(TFPPicture);
 122 };
 123
 124 VaapiVideoDecodeAccelerator::TFPPicture::TFPPicture(
 125     const base::Callback<bool(void)>& make_context_current,
 126     Display* x_display,
 127     int32 picture_buffer_id,
 128     uint32 texture_id,
 129     gfx::Size size)
 130     : make_context_current_(make_context_current),
 131       x_display_(x_display),
 132       picture_buffer_id_(picture_buffer_id),
 133       texture_id_(texture_id),
 134       size_(size),
 135       x_pixmap_(0),
 136       glx_pixmap_(0) {
 137   DCHECK(!make_context_current_.is_null());
 138 };
 139
 140 linked_ptr<VaapiVideoDecodeAccelerator::TFPPicture>
 141 VaapiVideoDecodeAccelerator::TFPPicture::Create(
 142     const base::Callback<bool(void)>& make_context_current,
 143     const GLXFBConfig& fb_config,
 144     Display* x_display,
 145     int32 picture_buffer_id,
 146     uint32 texture_id,
 147     gfx::Size size) {
 148
 149   linked_ptr<TFPPicture> tfp_picture(
 150       new TFPPicture(make_context_current, x_display, picture_buffer_id,
 151                      texture_id, size));
 152
 153   if (!tfp_picture->Initialize(fb_config))
 154     tfp_picture.reset();
 155
 156   return tfp_picture;
 157 }
 158
 159 bool VaapiVideoDecodeAccelerator::TFPPicture::Initialize(
 160     const GLXFBConfig& fb_config) {
 161   DCHECK(CalledOnValidThread());
 162   if (!make_context_current_.Run())
 163     return false;
 164
 165   XWindowAttributes win_attr;
 166   int screen = DefaultScreen(x_display_);
 167   XGetWindowAttributes(x_display_, RootWindow(x_display_, screen), &win_attr);
 168   //TODO(posciak): pass the depth required by libva, not the RootWindow's depth
 169   x_pixmap_ = XCreatePixmap(x_display_, RootWindow(x_display_, screen),
 170                             size_.width(), size_.height(), win_attr.depth);
 171   if (!x_pixmap_) {
 172     LOG(ERROR) << "Failed creating an X Pixmap for TFP";
 173     return false;
 174   }
 175
 176   static const int pixmap_attr[] = {
 177     GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
 178     GLX_TEXTURE_FORMAT_EXT, GLX_TEXTURE_FORMAT_RGB_EXT,
 179     GL_NONE,
 180   };
 181
 182   glx_pixmap_ = glXCreatePixmap(x_display_, fb_config, x_pixmap_, pixmap_attr);
 183   if (!glx_pixmap_) {
 184     // x_pixmap_ will be freed in the destructor.
 185     LOG(ERROR) << "Failed creating a GLX Pixmap for TFP";
 186     return false;
 187   }
 188
 189   return true;
 190 }
 191
 192 VaapiVideoDecodeAccelerator::TFPPicture::~TFPPicture() {
 193   DCHECK(CalledOnValidThread());
 194   // Unbind surface from texture and deallocate resources.
 195   if (glx_pixmap_ && make_context_current_.Run()) {
 196     glXReleaseTexImageEXT(x_display_, glx_pixmap_, GLX_FRONT_LEFT_EXT);
 197     glXDestroyPixmap(x_display_, glx_pixmap_);
 198   }
 199
 200   if (x_pixmap_)
 201     XFreePixmap(x_display_, x_pixmap_);
 202   XSync(x_display_, False);  // Needed to work around buggy vdpau-driver.
 203 }
 204
 205 bool VaapiVideoDecodeAccelerator::TFPPicture::Bind() {
 206   DCHECK(CalledOnValidThread());
 207   DCHECK(x_pixmap_);
 208   DCHECK(glx_pixmap_);
 209   if (!make_context_current_.Run())
 210     return false;
 211
 212   gfx::ScopedTextureBinder texture_binder(GL_TEXTURE_2D, texture_id_);
 213   glXBindTexImageEXT(x_display_, glx_pixmap_, GLX_FRONT_LEFT_EXT, NULL);
 214
 215   return true;
 216 }
 217
 218 VaapiVideoDecodeAccelerator::TFPPicture*
 219     VaapiVideoDecodeAccelerator::TFPPictureById(int32 picture_buffer_id) {
 220   TFPPictures::iterator it = tfp_pictures_.find(picture_buffer_id);
 221   if (it == tfp_pictures_.end()) {
 222     LOG(ERROR) << "Picture id " << picture_buffer_id << " does not exist";
 223     return NULL;
 224   }
 225
 226   return it->second.get();
 227 }
 228
 229 VaapiVideoDecodeAccelerator::VaapiVideoDecodeAccelerator(
 230     Display* x_display,
 231     const base::Callback<bool(void)>& make_context_current)
 232     : x_display_(x_display),
 233       make_context_current_(make_context_current),
 234       state_(kUninitialized),
 235       input_ready_(&lock_),
 236       surfaces_available_(&lock_),
 237       message_loop_(base::MessageLoop::current()),
 238       decoder_thread_("VaapiDecoderThread"),
 239       num_frames_at_client_(0),
 240       num_stream_bufs_at_decoder_(0),
 241       finish_flush_pending_(false),
 242       awaiting_va_surfaces_recycle_(false),
 243       requested_num_pics_(0),
 244       weak_this_factory_(this) {
 245   weak_this_ = weak_this_factory_.GetWeakPtr();
 246   va_surface_release_cb_ = media::BindToCurrentLoop(
 247       base::Bind(&VaapiVideoDecodeAccelerator::RecycleVASurfaceID, weak_this_));
 248 }
 249
 250 VaapiVideoDecodeAccelerator::~VaapiVideoDecodeAccelerator() {
 251   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 252 }
 253
 254 class XFreeDeleter {
 255  public:
 256   void operator()(void* x) const {
 257     ::XFree(x);
 258   }
 259 };
 260
 261 bool VaapiVideoDecodeAccelerator::InitializeFBConfig() {
 262   const int fbconfig_attr[] = {
 263     GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT,
 264     GLX_BIND_TO_TEXTURE_TARGETS_EXT, GLX_TEXTURE_2D_BIT_EXT,
 265     GLX_BIND_TO_TEXTURE_RGB_EXT, GL_TRUE,
 266     GLX_Y_INVERTED_EXT, GL_TRUE,
 267     GL_NONE,
 268   };
 269
 270   int num_fbconfigs;
 271   scoped_ptr<GLXFBConfig, XFreeDeleter> glx_fb_configs(
 272       glXChooseFBConfig(x_display_, DefaultScreen(x_display_), fbconfig_attr,
 273                         &num_fbconfigs));
 274   if (!glx_fb_configs)
 275     return false;
 276   if (!num_fbconfigs)
 277     return false;
 278
 279   fb_config_ = glx_fb_configs.get()[0];
 280   return true;
 281 }
 282
 283 bool VaapiVideoDecodeAccelerator::Initialize(media::VideoCodecProfile profile,
 284                                              Client* client) {
 285   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 286
 287   client_ptr_factory_.reset(new base::WeakPtrFactory<Client>(client));
 288   client_ = client_ptr_factory_->GetWeakPtr();
 289
 290   base::AutoLock auto_lock(lock_);
 291   DCHECK_EQ(state_, kUninitialized);
 292   DVLOG(2) << "Initializing VAVDA, profile: " << profile;
 293
 294   if (!make_context_current_.Run())
 295     return false;
 296
 297   if (!InitializeFBConfig()) {
 298     LOG(ERROR) << "Could not get a usable FBConfig";
 299     return false;
 300   }
 301
 302   vaapi_wrapper_ = VaapiWrapper::Create(
 303       VaapiWrapper::kDecode,
 304       profile,
 305       x_display_,
 306       base::Bind(&ReportToUMA, content::VaapiH264Decoder::VAAPI_ERROR));
 307
 308   if (!vaapi_wrapper_.get()) {
 309     LOG(ERROR) << "Failed initializing VAAPI";
 310     return false;
 311   }
 312
 313   decoder_.reset(
 314       new VaapiH264Decoder(
 315           vaapi_wrapper_.get(),
 316           media::BindToCurrentLoop(base::Bind(
 317               &VaapiVideoDecodeAccelerator::SurfaceReady, weak_this_)),
 318           base::Bind(&ReportToUMA)));
 319
 320   CHECK(decoder_thread_.Start());
 321   decoder_thread_proxy_ = decoder_thread_.message_loop_proxy();
 322
 323   state_ = kIdle;
 324   return true;
 325 }
 326
 327 void VaapiVideoDecodeAccelerator::SurfaceReady(
 328     int32 input_id,
 329     const scoped_refptr<VASurface>& va_surface) {
 330   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 331   DCHECK(!awaiting_va_surfaces_recycle_);
 332
 333   // Drop any requests to output if we are resetting or being destroyed.
 334   if (state_ == kResetting || state_ == kDestroying)
 335     return;
 336
 337   pending_output_cbs_.push(
 338       base::Bind(&VaapiVideoDecodeAccelerator::OutputPicture,
 339                  weak_this_, va_surface, input_id));
 340
 341   TryOutputSurface();
 342 }
 343
 344 void VaapiVideoDecodeAccelerator::OutputPicture(
 345     const scoped_refptr<VASurface>& va_surface,
 346     int32 input_id,
 347     TFPPicture* tfp_picture) {
 348   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 349
 350   int32 output_id  = tfp_picture->picture_buffer_id();
 351
 352   TRACE_EVENT2("Video Decoder", "VAVDA::OutputSurface",
 353                "input_id", input_id,
 354                "output_id", output_id);
 355
 356   DVLOG(3) << "Outputting VASurface " << va_surface->id()
 357            << " into pixmap bound to picture buffer id " << output_id;
 358
 359   RETURN_AND_NOTIFY_ON_FAILURE(tfp_picture->Bind(),
 360                                "Failed binding texture to pixmap",
 361                                PLATFORM_FAILURE, );
 362
 363   RETURN_AND_NOTIFY_ON_FAILURE(
 364       vaapi_wrapper_->PutSurfaceIntoPixmap(va_surface->id(),
 365                                            tfp_picture->x_pixmap(),
 366                                            tfp_picture->size()),
 367       "Failed putting surface into pixmap", PLATFORM_FAILURE, );
 368
 369   // Notify the client a picture is ready to be displayed.
 370   ++num_frames_at_client_;
 371   TRACE_COUNTER1("Video Decoder", "Textures at client", num_frames_at_client_);
 372   DVLOG(4) << "Notifying output picture id " << output_id
 373            << " for input "<< input_id << " is ready";
 374   // TODO(posciak): Use visible size from decoder here instead
 375   // (crbug.com/402760).
 376   if (client_)
 377     client_->PictureReady(
 378         media::Picture(output_id, input_id, gfx::Rect(tfp_picture->size())));
 379 }
 380
 381 void VaapiVideoDecodeAccelerator::TryOutputSurface() {
 382   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 383
 384   // Handle Destroy() arriving while pictures are queued for output.
 385   if (!client_)
 386     return;
 387
 388   if (pending_output_cbs_.empty() || output_buffers_.empty())
 389     return;
 390
 391   OutputCB output_cb = pending_output_cbs_.front();
 392   pending_output_cbs_.pop();
 393
 394   TFPPicture* tfp_picture = TFPPictureById(output_buffers_.front());
 395   DCHECK(tfp_picture);
 396   output_buffers_.pop();
 397
 398   output_cb.Run(tfp_picture);
 399
 400   if (finish_flush_pending_ && pending_output_cbs_.empty())
 401     FinishFlush();
 402 }
 403
 404 void VaapiVideoDecodeAccelerator::MapAndQueueNewInputBuffer(
 405     const media::BitstreamBuffer& bitstream_buffer) {
 406   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 407   TRACE_EVENT1("Video Decoder", "MapAndQueueNewInputBuffer", "input_id",
 408       bitstream_buffer.id());
 409
 410   DVLOG(4) << "Mapping new input buffer id: " << bitstream_buffer.id()
 411            << " size: " << (int)bitstream_buffer.size();
 412
 413   scoped_ptr<base::SharedMemory> shm(
 414       new base::SharedMemory(bitstream_buffer.handle(), true));
 415   RETURN_AND_NOTIFY_ON_FAILURE(shm->Map(bitstream_buffer.size()),
 416                               "Failed to map input buffer", UNREADABLE_INPUT,);
 417
 418   base::AutoLock auto_lock(lock_);
 419
 420   // Set up a new input buffer and queue it for later.
 421   linked_ptr<InputBuffer> input_buffer(new InputBuffer());
 422   input_buffer->shm.reset(shm.release());
 423   input_buffer->id = bitstream_buffer.id();
 424   input_buffer->size = bitstream_buffer.size();
 425
 426   ++num_stream_bufs_at_decoder_;
 427   TRACE_COUNTER1("Video Decoder", "Stream buffers at decoder",
 428                  num_stream_bufs_at_decoder_);
 429
 430   input_buffers_.push(input_buffer);
 431   input_ready_.Signal();
 432 }
 433
 434 bool VaapiVideoDecodeAccelerator::GetInputBuffer_Locked() {
 435   DCHECK(decoder_thread_proxy_->BelongsToCurrentThread());
 436   lock_.AssertAcquired();
 437
 438   if (curr_input_buffer_.get())
 439     return true;
 440
 441   // Will only wait if it is expected that in current state new buffers will
 442   // be queued from the client via Decode(). The state can change during wait.
 443   while (input_buffers_.empty() && (state_ == kDecoding || state_ == kIdle)) {
 444     input_ready_.Wait();
 445   }
 446
 447   // We could have got woken up in a different state or never got to sleep
 448   // due to current state; check for that.
 449   switch (state_) {
 450     case kFlushing:
 451       // Here we are only interested in finishing up decoding buffers that are
 452       // already queued up. Otherwise will stop decoding.
 453       if (input_buffers_.empty())
 454         return false;
 455       // else fallthrough
 456     case kDecoding:
 457     case kIdle:
 458       DCHECK(!input_buffers_.empty());
 459
 460       curr_input_buffer_ = input_buffers_.front();
 461       input_buffers_.pop();
 462
 463       DVLOG(4) << "New current bitstream buffer, id: "
 464                << curr_input_buffer_->id
 465                << " size: " << curr_input_buffer_->size;
 466
 467       decoder_->SetStream(
 468           static_cast<uint8*>(curr_input_buffer_->shm->memory()),
 469           curr_input_buffer_->size, curr_input_buffer_->id);
 470       return true;
 471
 472     default:
 473       // We got woken up due to being destroyed/reset, ignore any already
 474       // queued inputs.
 475       return false;
 476   }
 477 }
 478
 479 void VaapiVideoDecodeAccelerator::ReturnCurrInputBuffer_Locked() {
 480   lock_.AssertAcquired();
 481   DCHECK(decoder_thread_proxy_->BelongsToCurrentThread());
 482   DCHECK(curr_input_buffer_.get());
 483
 484   int32 id = curr_input_buffer_->id;
 485   curr_input_buffer_.reset();
 486   DVLOG(4) << "End of input buffer " << id;
 487   message_loop_->PostTask(FROM_HERE, base::Bind(
 488       &Client::NotifyEndOfBitstreamBuffer, client_, id));
 489
 490   --num_stream_bufs_at_decoder_;
 491   TRACE_COUNTER1("Video Decoder", "Stream buffers at decoder",
 492                  num_stream_bufs_at_decoder_);
 493 }
 494
 495 bool VaapiVideoDecodeAccelerator::FeedDecoderWithOutputSurfaces_Locked() {
 496   lock_.AssertAcquired();
 497   DCHECK(decoder_thread_proxy_->BelongsToCurrentThread());
 498
 499   while (available_va_surfaces_.empty() &&
 500          (state_ == kDecoding || state_ == kFlushing || state_ == kIdle)) {
 501     surfaces_available_.Wait();
 502   }
 503
 504   if (state_ != kDecoding && state_ != kFlushing && state_ != kIdle)
 505     return false;
 506
 507   while (!available_va_surfaces_.empty()) {
 508     scoped_refptr<VASurface> va_surface(
 509         new VASurface(available_va_surfaces_.front(), va_surface_release_cb_));
 510     available_va_surfaces_.pop_front();
 511     decoder_->ReuseSurface(va_surface);
 512   }
 513
 514   return true;
 515 }
 516
 517 void VaapiVideoDecodeAccelerator::DecodeTask() {
 518   DCHECK(decoder_thread_proxy_->BelongsToCurrentThread());
 519   TRACE_EVENT0("Video Decoder", "VAVDA::DecodeTask");
 520   base::AutoLock auto_lock(lock_);
 521
 522   if (state_ != kDecoding)
 523     return;
 524
 525   // Main decode task.
 526   DVLOG(4) << "Decode task";
 527
 528   // Try to decode what stream data is (still) in the decoder until we run out
 529   // of it.
 530   while (GetInputBuffer_Locked()) {
 531     DCHECK(curr_input_buffer_.get());
 532
 533     VaapiH264Decoder::DecResult res;
 534     {
 535       // We are OK releasing the lock here, as decoder never calls our methods
 536       // directly and we will reacquire the lock before looking at state again.
 537       // This is the main decode function of the decoder and while keeping
 538       // the lock for its duration would be fine, it would defeat the purpose
 539       // of having a separate decoder thread.
 540       base::AutoUnlock auto_unlock(lock_);
 541       res = decoder_->Decode();
 542     }
 543
 544     switch (res) {
 545       case VaapiH264Decoder::kAllocateNewSurfaces:
 546         DVLOG(1) << "Decoder requesting a new set of surfaces";
 547         message_loop_->PostTask(FROM_HERE, base::Bind(
 548             &VaapiVideoDecodeAccelerator::InitiateSurfaceSetChange, weak_this_,
 549                 decoder_->GetRequiredNumOfPictures(),
 550                 decoder_->GetPicSize()));
 551         // We'll get rescheduled once ProvidePictureBuffers() finishes.
 552         return;
 553
 554       case VaapiH264Decoder::kRanOutOfStreamData:
 555         ReturnCurrInputBuffer_Locked();
 556         break;
 557
 558       case VaapiH264Decoder::kRanOutOfSurfaces:
 559         // No more output buffers in the decoder, try getting more or go to
 560         // sleep waiting for them.
 561         if (!FeedDecoderWithOutputSurfaces_Locked())
 562           return;
 563
 564         break;
 565
 566       case VaapiH264Decoder::kDecodeError:
 567         RETURN_AND_NOTIFY_ON_FAILURE(false, "Error decoding stream",
 568                                      PLATFORM_FAILURE, );
 569         return;
 570     }
 571   }
 572 }
 573
 574 void VaapiVideoDecodeAccelerator::InitiateSurfaceSetChange(size_t num_pics,
 575                                                            gfx::Size size) {
 576   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 577   DCHECK(!awaiting_va_surfaces_recycle_);
 578
 579   // At this point decoder has stopped running and has already posted onto our
 580   // loop any remaining output request callbacks, which executed before we got
 581   // here. Some of them might have been pended though, because we might not
 582   // have had enough TFPictures to output surfaces to. Initiate a wait cycle,
 583   // which will wait for client to return enough PictureBuffers to us, so that
 584   // we can finish all pending output callbacks, releasing associated surfaces.
 585   DVLOG(1) << "Initiating surface set change";
 586   awaiting_va_surfaces_recycle_ = true;
 587
 588   requested_num_pics_ = num_pics;
 589   requested_pic_size_ = size;
 590
 591   TryFinishSurfaceSetChange();
 592 }
 593
 594 void VaapiVideoDecodeAccelerator::TryFinishSurfaceSetChange() {
 595   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 596
 597   if (!awaiting_va_surfaces_recycle_)
 598     return;
 599
 600   if (!pending_output_cbs_.empty() ||
 601       tfp_pictures_.size() != available_va_surfaces_.size()) {
 602     // Either:
 603     // 1. Not all pending pending output callbacks have been executed yet.
 604     // Wait for the client to return enough pictures and retry later.
 605     // 2. The above happened and all surface release callbacks have been posted
 606     // as the result, but not all have executed yet. Post ourselves after them
 607     // to let them release surfaces.
 608     DVLOG(2) << "Awaiting pending output/surface release callbacks to finish";
 609     message_loop_->PostTask(FROM_HERE, base::Bind(
 610         &VaapiVideoDecodeAccelerator::TryFinishSurfaceSetChange, weak_this_));
 611     return;
 612   }
 613
 614   // All surfaces released, destroy them and dismiss all PictureBuffers.
 615   awaiting_va_surfaces_recycle_ = false;
 616   available_va_surfaces_.clear();
 617   vaapi_wrapper_->DestroySurfaces();
 618
 619   for (TFPPictures::iterator iter = tfp_pictures_.begin();
 620        iter != tfp_pictures_.end(); ++iter) {
 621     DVLOG(2) << "Dismissing picture id: " << iter->first;
 622     if (client_)
 623       client_->DismissPictureBuffer(iter->first);
 624   }
 625   tfp_pictures_.clear();
 626
 627   // And ask for a new set as requested.
 628   DVLOG(1) << "Requesting " << requested_num_pics_ << " pictures of size: "
 629            << requested_pic_size_.ToString();
 630
 631   message_loop_->PostTask(FROM_HERE, base::Bind(
 632       &Client::ProvidePictureBuffers, client_,
 633       requested_num_pics_, requested_pic_size_, GL_TEXTURE_2D));
 634 }
 635
 636 void VaapiVideoDecodeAccelerator::Decode(
 637     const media::BitstreamBuffer& bitstream_buffer) {
 638   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 639
 640   TRACE_EVENT1("Video Decoder", "VAVDA::Decode", "Buffer id",
 641                bitstream_buffer.id());
 642
 643   // We got a new input buffer from the client, map it and queue for later use.
 644   MapAndQueueNewInputBuffer(bitstream_buffer);
 645
 646   base::AutoLock auto_lock(lock_);
 647   switch (state_) {
 648     case kIdle:
 649       state_ = kDecoding;
 650       decoder_thread_proxy_->PostTask(FROM_HERE, base::Bind(
 651           &VaapiVideoDecodeAccelerator::DecodeTask,
 652           base::Unretained(this)));
 653       break;
 654
 655     case kDecoding:
 656       // Decoder already running, fallthrough.
 657     case kResetting:
 658       // When resetting, allow accumulating bitstream buffers, so that
 659       // the client can queue after-seek-buffers while we are finishing with
 660       // the before-seek one.
 661       break;
 662
 663     default:
 664       RETURN_AND_NOTIFY_ON_FAILURE(false,
 665           "Decode request from client in invalid state: " << state_,
 666           PLATFORM_FAILURE, );
 667       break;
 668   }
 669 }
 670
 671 void VaapiVideoDecodeAccelerator::RecycleVASurfaceID(
 672     VASurfaceID va_surface_id) {
 673   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 674   base::AutoLock auto_lock(lock_);
 675
 676   available_va_surfaces_.push_back(va_surface_id);
 677   surfaces_available_.Signal();
 678 }
 679
 680 void VaapiVideoDecodeAccelerator::AssignPictureBuffers(
 681     const std::vector<media::PictureBuffer>& buffers) {
 682   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 683
 684   base::AutoLock auto_lock(lock_);
 685   DCHECK(tfp_pictures_.empty());
 686
 687   while (!output_buffers_.empty())
 688     output_buffers_.pop();
 689
 690   RETURN_AND_NOTIFY_ON_FAILURE(
 691       buffers.size() == requested_num_pics_,
 692       "Got an invalid number of picture buffers. (Got " << buffers.size()
 693       << ", requested " << requested_num_pics_ << ")", INVALID_ARGUMENT, );
 694   DCHECK(requested_pic_size_ == buffers[0].size());
 695
 696   std::vector<VASurfaceID> va_surface_ids;
 697   RETURN_AND_NOTIFY_ON_FAILURE(
 698       vaapi_wrapper_->CreateSurfaces(requested_pic_size_,
 699                                      buffers.size(),
 700                                      &va_surface_ids),
 701       "Failed creating VA Surfaces", PLATFORM_FAILURE, );
 702   DCHECK_EQ(va_surface_ids.size(), buffers.size());
 703
 704   for (size_t i = 0; i < buffers.size(); ++i) {
 705     DVLOG(2) << "Assigning picture id: " << buffers[i].id()
 706              << " to texture id: " << buffers[i].texture_id()
 707              << " VASurfaceID: " << va_surface_ids[i];
 708
 709     linked_ptr<TFPPicture> tfp_picture(
 710         TFPPicture::Create(make_context_current_, fb_config_, x_display_,
 711                            buffers[i].id(), buffers[i].texture_id(),
 712                            requested_pic_size_));
 713
 714     RETURN_AND_NOTIFY_ON_FAILURE(
 715         tfp_picture.get(), "Failed assigning picture buffer to a texture.",
 716         PLATFORM_FAILURE, );
 717
 718     bool inserted = tfp_pictures_.insert(std::make_pair(
 719         buffers[i].id(), tfp_picture)).second;
 720     DCHECK(inserted);
 721
 722     output_buffers_.push(buffers[i].id());
 723     available_va_surfaces_.push_back(va_surface_ids[i]);
 724     surfaces_available_.Signal();
 725   }
 726
 727   state_ = kDecoding;
 728   decoder_thread_proxy_->PostTask(FROM_HERE, base::Bind(
 729       &VaapiVideoDecodeAccelerator::DecodeTask, base::Unretained(this)));
 730 }
 731
 732 void VaapiVideoDecodeAccelerator::ReusePictureBuffer(int32 picture_buffer_id) {
 733   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 734   TRACE_EVENT1("Video Decoder", "VAVDA::ReusePictureBuffer", "Picture id",
 735                picture_buffer_id);
 736
 737   --num_frames_at_client_;
 738   TRACE_COUNTER1("Video Decoder", "Textures at client", num_frames_at_client_);
 739
 740   output_buffers_.push(picture_buffer_id);
 741   TryOutputSurface();
 742 }
 743
 744 void VaapiVideoDecodeAccelerator::FlushTask() {
 745   DCHECK(decoder_thread_proxy_->BelongsToCurrentThread());
 746   DVLOG(1) << "Flush task";
 747
 748   // First flush all the pictures that haven't been outputted, notifying the
 749   // client to output them.
 750   bool res = decoder_->Flush();
 751   RETURN_AND_NOTIFY_ON_FAILURE(res, "Failed flushing the decoder.",
 752                                PLATFORM_FAILURE, );
 753
 754   // Put the decoder in idle state, ready to resume.
 755   decoder_->Reset();
 756
 757   message_loop_->PostTask(FROM_HERE, base::Bind(
 758       &VaapiVideoDecodeAccelerator::FinishFlush, weak_this_));
 759 }
 760
 761 void VaapiVideoDecodeAccelerator::Flush() {
 762   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 763   DVLOG(1) << "Got flush request";
 764
 765   base::AutoLock auto_lock(lock_);
 766   state_ = kFlushing;
 767   // Queue a flush task after all existing decoding tasks to clean up.
 768   decoder_thread_proxy_->PostTask(FROM_HERE, base::Bind(
 769       &VaapiVideoDecodeAccelerator::FlushTask, base::Unretained(this)));
 770
 771   input_ready_.Signal();
 772   surfaces_available_.Signal();
 773 }
 774
 775 void VaapiVideoDecodeAccelerator::FinishFlush() {
 776   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 777
 778   finish_flush_pending_ = false;
 779
 780   base::AutoLock auto_lock(lock_);
 781   if (state_ != kFlushing) {
 782     DCHECK_EQ(state_, kDestroying);
 783     return;  // We could've gotten destroyed already.
 784   }
 785
 786   // Still waiting for textures from client to finish outputting all pending
 787   // frames. Try again later.
 788   if (!pending_output_cbs_.empty()) {
 789     finish_flush_pending_ = true;
 790     return;
 791   }
 792
 793   state_ = kIdle;
 794
 795   message_loop_->PostTask(FROM_HERE, base::Bind(
 796       &Client::NotifyFlushDone, client_));
 797
 798   DVLOG(1) << "Flush finished";
 799 }
 800
 801 void VaapiVideoDecodeAccelerator::ResetTask() {
 802   DCHECK(decoder_thread_proxy_->BelongsToCurrentThread());
 803   DVLOG(1) << "ResetTask";
 804
 805   // All the decoding tasks from before the reset request from client are done
 806   // by now, as this task was scheduled after them and client is expected not
 807   // to call Decode() after Reset() and before NotifyResetDone.
 808   decoder_->Reset();
 809
 810   base::AutoLock auto_lock(lock_);
 811
 812   // Return current input buffer, if present.
 813   if (curr_input_buffer_.get())
 814     ReturnCurrInputBuffer_Locked();
 815
 816   // And let client know that we are done with reset.
 817   message_loop_->PostTask(FROM_HERE, base::Bind(
 818       &VaapiVideoDecodeAccelerator::FinishReset, weak_this_));
 819 }
 820
 821 void VaapiVideoDecodeAccelerator::Reset() {
 822   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 823   DVLOG(1) << "Got reset request";
 824
 825   // This will make any new decode tasks exit early.
 826   base::AutoLock auto_lock(lock_);
 827   state_ = kResetting;
 828   finish_flush_pending_ = false;
 829
 830   // Drop all remaining input buffers, if present.
 831   while (!input_buffers_.empty()) {
 832     message_loop_->PostTask(FROM_HERE, base::Bind(
 833         &Client::NotifyEndOfBitstreamBuffer, client_,
 834         input_buffers_.front()->id));
 835     input_buffers_.pop();
 836   }
 837
 838   decoder_thread_proxy_->PostTask(FROM_HERE, base::Bind(
 839       &VaapiVideoDecodeAccelerator::ResetTask, base::Unretained(this)));
 840
 841   input_ready_.Signal();
 842   surfaces_available_.Signal();
 843 }
 844
 845 void VaapiVideoDecodeAccelerator::FinishReset() {
 846   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 847   DVLOG(1) << "FinishReset";
 848   base::AutoLock auto_lock(lock_);
 849
 850   if (state_ != kResetting) {
 851     DCHECK(state_ == kDestroying || state_ == kUninitialized) << state_;
 852     return;  // We could've gotten destroyed already.
 853   }
 854
 855   // Drop pending outputs.
 856   while (!pending_output_cbs_.empty())
 857     pending_output_cbs_.pop();
 858
 859   if (awaiting_va_surfaces_recycle_) {
 860     // Decoder requested a new surface set while we were waiting for it to
 861     // finish the last DecodeTask, running at the time of Reset().
 862     // Let the surface set change finish first before resetting.
 863     message_loop_->PostTask(FROM_HERE, base::Bind(
 864         &VaapiVideoDecodeAccelerator::FinishReset, weak_this_));
 865     return;
 866   }
 867
 868   num_stream_bufs_at_decoder_ = 0;
 869   state_ = kIdle;
 870
 871   message_loop_->PostTask(FROM_HERE, base::Bind(
 872       &Client::NotifyResetDone, client_));
 873
 874   // The client might have given us new buffers via Decode() while we were
 875   // resetting and might be waiting for our move, and not call Decode() anymore
 876   // until we return something. Post a DecodeTask() so that we won't
 877   // sleep forever waiting for Decode() in that case. Having two of them
 878   // in the pipe is harmless, the additional one will return as soon as it sees
 879   // that we are back in kDecoding state.
 880   if (!input_buffers_.empty()) {
 881     state_ = kDecoding;
 882     decoder_thread_proxy_->PostTask(FROM_HERE, base::Bind(
 883       &VaapiVideoDecodeAccelerator::DecodeTask,
 884       base::Unretained(this)));
 885   }
 886
 887   DVLOG(1) << "Reset finished";
 888 }
 889
 890 void VaapiVideoDecodeAccelerator::Cleanup() {
 891   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 892
 893   if (state_ == kUninitialized || state_ == kDestroying)
 894     return;
 895
 896   DVLOG(1) << "Destroying VAVDA";
 897   base::AutoLock auto_lock(lock_);
 898   state_ = kDestroying;
 899
 900   client_ptr_factory_.reset();
 901   weak_this_factory_.InvalidateWeakPtrs();
 902
 903   // Signal all potential waiters on the decoder_thread_, let them early-exit,
 904   // as we've just moved to the kDestroying state, and wait for all tasks
 905   // to finish.
 906   input_ready_.Signal();
 907   surfaces_available_.Signal();
 908   {
 909     base::AutoUnlock auto_unlock(lock_);
 910     decoder_thread_.Stop();
 911   }
 912
 913   state_ = kUninitialized;
 914 }
 915
 916 void VaapiVideoDecodeAccelerator::Destroy() {
 917   DCHECK_EQ(message_loop_, base::MessageLoop::current());
 918   Cleanup();
 919   delete this;
 920 }
 921
 922 bool VaapiVideoDecodeAccelerator::CanDecodeOnIOThread() {
 923   return false;
 924 }
 925
 926 }  // namespace content