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| 1 // Copyright (c) 2011 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 "webkit/glue/media/buffered_data_source.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "media/base/filter_host.h" | |
| 9 #include "media/base/media_log.h" | |
| 10 #include "net/base/net_errors.h" | |
| 11 #include "webkit/glue/media/web_data_source_factory.h" | |
| 12 #include "webkit/glue/webkit_glue.h" | |
| 13 | |
| 14 using WebKit::WebFrame; | |
| 15 | |
| 16 namespace webkit_glue { | |
| 17 | |
| 18 // BufferedDataSource has an intermediate buffer, this value governs the initial | |
| 19 // size of that buffer. It is set to 32KB because this is a typical read size | |
| 20 // of FFmpeg. | |
| 21 static const int kInitialReadBufferSize = 32768; | |
| 22 | |
| 23 // Number of cache misses we allow for a single Read() before signalling an | |
| 24 // error. | |
| 25 static const int kNumCacheMissRetries = 3; | |
| 26 | |
| 27 static WebDataSource* NewBufferedDataSource(MessageLoop* render_loop, | |
| 28 WebKit::WebFrame* frame, | |
| 29 media::MediaLog* media_log) { | |
| 30 return new BufferedDataSource(render_loop, frame, media_log); | |
| 31 } | |
| 32 | |
| 33 // static | |
| 34 media::DataSourceFactory* BufferedDataSource::CreateFactory( | |
| 35 MessageLoop* render_loop, | |
| 36 WebKit::WebFrame* frame, | |
| 37 media::MediaLog* media_log, | |
| 38 const WebDataSourceBuildObserverHack& build_observer) { | |
| 39 return new WebDataSourceFactory(render_loop, frame, media_log, | |
| 40 &NewBufferedDataSource, build_observer); | |
| 41 } | |
| 42 | |
| 43 BufferedDataSource::BufferedDataSource( | |
| 44 MessageLoop* render_loop, | |
| 45 WebFrame* frame, | |
| 46 media::MediaLog* media_log) | |
| 47 : total_bytes_(kPositionNotSpecified), | |
| 48 buffered_bytes_(0), | |
| 49 loaded_(false), | |
| 50 streaming_(false), | |
| 51 frame_(frame), | |
| 52 loader_(NULL), | |
| 53 is_downloading_data_(false), | |
| 54 read_position_(0), | |
| 55 read_size_(0), | |
| 56 read_buffer_(NULL), | |
| 57 intermediate_read_buffer_(new uint8[kInitialReadBufferSize]), | |
| 58 intermediate_read_buffer_size_(kInitialReadBufferSize), | |
| 59 render_loop_(render_loop), | |
| 60 stop_signal_received_(false), | |
| 61 stopped_on_render_loop_(false), | |
| 62 media_is_paused_(true), | |
| 63 media_has_played_(false), | |
| 64 preload_(media::AUTO), | |
| 65 using_range_request_(true), | |
| 66 cache_miss_retries_left_(kNumCacheMissRetries), | |
| 67 bitrate_(0), | |
| 68 playback_rate_(0.0), | |
| 69 media_log_(media_log) { | |
| 70 } | |
| 71 | |
| 72 BufferedDataSource::~BufferedDataSource() {} | |
| 73 | |
| 74 // A factory method to create BufferedResourceLoader using the read parameters. | |
| 75 // This method can be overrided to inject mock BufferedResourceLoader object | |
| 76 // for testing purpose. | |
| 77 BufferedResourceLoader* BufferedDataSource::CreateResourceLoader( | |
| 78 int64 first_byte_position, int64 last_byte_position) { | |
| 79 DCHECK(MessageLoop::current() == render_loop_); | |
| 80 | |
| 81 return new BufferedResourceLoader(url_, | |
| 82 first_byte_position, | |
| 83 last_byte_position, | |
| 84 ChooseDeferStrategy(), | |
| 85 bitrate_, | |
| 86 playback_rate_, | |
| 87 media_log_); | |
| 88 } | |
| 89 | |
| 90 void BufferedDataSource::set_host(media::FilterHost* host) { | |
| 91 DataSource::set_host(host); | |
| 92 | |
| 93 if (loader_.get()) { | |
| 94 base::AutoLock auto_lock(lock_); | |
| 95 UpdateHostState_Locked(); | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 void BufferedDataSource::Initialize(const std::string& url, | |
| 100 const media::PipelineStatusCB& callback) { | |
| 101 // Saves the url. | |
| 102 url_ = GURL(url); | |
| 103 | |
| 104 // This data source doesn't support data:// protocol so reject it. | |
| 105 if (url_.SchemeIs(kDataScheme)) { | |
| 106 callback.Run(media::DATASOURCE_ERROR_URL_NOT_SUPPORTED); | |
| 107 return; | |
| 108 } else if (!IsProtocolSupportedForMedia(url_)) { | |
| 109 callback.Run(media::PIPELINE_ERROR_NETWORK); | |
| 110 return; | |
| 111 } | |
| 112 | |
| 113 DCHECK(!callback.is_null()); | |
| 114 { | |
| 115 base::AutoLock auto_lock(lock_); | |
| 116 initialize_cb_ = callback; | |
| 117 } | |
| 118 | |
| 119 // Post a task to complete the initialization task. | |
| 120 render_loop_->PostTask(FROM_HERE, | |
| 121 base::Bind(&BufferedDataSource::InitializeTask, this)); | |
| 122 } | |
| 123 | |
| 124 void BufferedDataSource::CancelInitialize() { | |
| 125 base::AutoLock auto_lock(lock_); | |
| 126 DCHECK(!initialize_cb_.is_null()); | |
| 127 | |
| 128 initialize_cb_.Reset(); | |
| 129 | |
| 130 render_loop_->PostTask( | |
| 131 FROM_HERE, base::Bind(&BufferedDataSource::CleanupTask, this)); | |
| 132 } | |
| 133 | |
| 134 ///////////////////////////////////////////////////////////////////////////// | |
| 135 // media::Filter implementation. | |
| 136 void BufferedDataSource::Stop(const base::Closure& callback) { | |
| 137 { | |
| 138 base::AutoLock auto_lock(lock_); | |
| 139 stop_signal_received_ = true; | |
| 140 } | |
| 141 if (!callback.is_null()) | |
| 142 callback.Run(); | |
| 143 | |
| 144 render_loop_->PostTask(FROM_HERE, | |
| 145 base::Bind(&BufferedDataSource::CleanupTask, this)); | |
| 146 } | |
| 147 | |
| 148 void BufferedDataSource::SetPlaybackRate(float playback_rate) { | |
| 149 render_loop_->PostTask(FROM_HERE, base::Bind( | |
| 150 &BufferedDataSource::SetPlaybackRateTask, this, playback_rate)); | |
| 151 } | |
| 152 | |
| 153 void BufferedDataSource::SetPreload(media::Preload preload) { | |
| 154 render_loop_->PostTask(FROM_HERE, base::Bind( | |
| 155 &BufferedDataSource::SetPreloadTask, this, preload)); | |
| 156 } | |
| 157 | |
| 158 void BufferedDataSource::SetBitrate(int bitrate) { | |
| 159 render_loop_->PostTask(FROM_HERE, base::Bind( | |
| 160 &BufferedDataSource::SetBitrateTask, this, bitrate)); | |
| 161 } | |
| 162 | |
| 163 ///////////////////////////////////////////////////////////////////////////// | |
| 164 // media::DataSource implementation. | |
| 165 void BufferedDataSource::Read( | |
| 166 int64 position, size_t size, uint8* data, | |
| 167 const media::DataSource::ReadCallback& read_callback) { | |
| 168 VLOG(1) << "Read: " << position << " offset, " << size << " bytes"; | |
| 169 DCHECK(!read_callback.is_null()); | |
| 170 | |
| 171 { | |
| 172 base::AutoLock auto_lock(lock_); | |
| 173 DCHECK(read_callback_.is_null()); | |
| 174 | |
| 175 if (stop_signal_received_ || stopped_on_render_loop_) { | |
| 176 read_callback.Run(kReadError); | |
| 177 return; | |
| 178 } | |
| 179 | |
| 180 read_callback_ = read_callback; | |
| 181 } | |
| 182 | |
| 183 render_loop_->PostTask(FROM_HERE, base::Bind( | |
| 184 &BufferedDataSource::ReadTask, this, | |
| 185 position, static_cast<int>(size), data)); | |
| 186 } | |
| 187 | |
| 188 bool BufferedDataSource::GetSize(int64* size_out) { | |
| 189 if (total_bytes_ != kPositionNotSpecified) { | |
| 190 *size_out = total_bytes_; | |
| 191 return true; | |
| 192 } | |
| 193 *size_out = 0; | |
| 194 return false; | |
| 195 } | |
| 196 | |
| 197 bool BufferedDataSource::IsStreaming() { | |
| 198 return streaming_; | |
| 199 } | |
| 200 | |
| 201 bool BufferedDataSource::HasSingleOrigin() { | |
| 202 DCHECK(MessageLoop::current() == render_loop_); | |
| 203 return loader_.get() ? loader_->HasSingleOrigin() : true; | |
| 204 } | |
| 205 | |
| 206 void BufferedDataSource::Abort() { | |
| 207 DCHECK(MessageLoop::current() == render_loop_); | |
| 208 | |
| 209 CleanupTask(); | |
| 210 frame_ = NULL; | |
| 211 } | |
| 212 | |
| 213 ///////////////////////////////////////////////////////////////////////////// | |
| 214 // Render thread tasks. | |
| 215 void BufferedDataSource::InitializeTask() { | |
| 216 DCHECK(MessageLoop::current() == render_loop_); | |
| 217 DCHECK(!loader_.get()); | |
| 218 | |
| 219 { | |
| 220 base::AutoLock auto_lock(lock_); | |
| 221 if (stopped_on_render_loop_ || initialize_cb_.is_null() || | |
| 222 stop_signal_received_) { | |
| 223 return; | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 if (url_.SchemeIs(kHttpScheme) || url_.SchemeIs(kHttpsScheme)) { | |
| 228 // Do an unbounded range request starting at the beginning. If the server | |
| 229 // responds with 200 instead of 206 we'll fall back into a streaming mode. | |
| 230 loader_ = CreateResourceLoader(0, kPositionNotSpecified); | |
| 231 loader_->Start( | |
| 232 NewCallback(this, &BufferedDataSource::HttpInitialStartCallback), | |
| 233 base::Bind(&BufferedDataSource::NetworkEventCallback, this), | |
| 234 frame_); | |
| 235 } else { | |
| 236 // For all other protocols, assume they support range request. We fetch | |
| 237 // the full range of the resource to obtain the instance size because | |
| 238 // we won't be served HTTP headers. | |
| 239 loader_ = CreateResourceLoader(kPositionNotSpecified, | |
| 240 kPositionNotSpecified); | |
| 241 loader_->Start( | |
| 242 NewCallback(this, &BufferedDataSource::NonHttpInitialStartCallback), | |
| 243 base::Bind(&BufferedDataSource::NetworkEventCallback, this), | |
| 244 frame_); | |
| 245 } | |
| 246 } | |
| 247 | |
| 248 void BufferedDataSource::ReadTask( | |
| 249 int64 position, | |
| 250 int read_size, | |
| 251 uint8* buffer) { | |
| 252 DCHECK(MessageLoop::current() == render_loop_); | |
| 253 { | |
| 254 base::AutoLock auto_lock(lock_); | |
| 255 if (stopped_on_render_loop_) | |
| 256 return; | |
| 257 | |
| 258 DCHECK(!read_callback_.is_null()); | |
| 259 } | |
| 260 | |
| 261 // Saves the read parameters. | |
| 262 read_position_ = position; | |
| 263 read_size_ = read_size; | |
| 264 read_buffer_ = buffer; | |
| 265 cache_miss_retries_left_ = kNumCacheMissRetries; | |
| 266 | |
| 267 // Call to read internal to perform the actual read. | |
| 268 ReadInternal(); | |
| 269 } | |
| 270 | |
| 271 void BufferedDataSource::CleanupTask() { | |
| 272 DCHECK(MessageLoop::current() == render_loop_); | |
| 273 | |
| 274 { | |
| 275 base::AutoLock auto_lock(lock_); | |
| 276 initialize_cb_.Reset(); | |
| 277 if (stopped_on_render_loop_) | |
| 278 return; | |
| 279 | |
| 280 // Signal that stop task has finished execution. | |
| 281 // NOTE: it's vital that this be set under lock, as that's how Read() tests | |
| 282 // before registering a new |read_callback_| (which is cleared below). | |
| 283 stopped_on_render_loop_ = true; | |
| 284 | |
| 285 if (!read_callback_.is_null()) | |
| 286 DoneRead_Locked(net::ERR_FAILED); | |
| 287 } | |
| 288 | |
| 289 // We just need to stop the loader, so it stops activity. | |
| 290 if (loader_.get()) | |
| 291 loader_->Stop(); | |
| 292 | |
| 293 // Reset the parameters of the current read request. | |
| 294 read_position_ = 0; | |
| 295 read_size_ = 0; | |
| 296 read_buffer_ = 0; | |
| 297 } | |
| 298 | |
| 299 void BufferedDataSource::RestartLoadingTask() { | |
| 300 DCHECK(MessageLoop::current() == render_loop_); | |
| 301 if (stopped_on_render_loop_) | |
| 302 return; | |
| 303 | |
| 304 { | |
| 305 // If there's no outstanding read then return early. | |
| 306 base::AutoLock auto_lock(lock_); | |
| 307 if (read_callback_.is_null()) | |
| 308 return; | |
| 309 } | |
| 310 | |
| 311 loader_ = CreateResourceLoader(read_position_, kPositionNotSpecified); | |
| 312 loader_->Start( | |
| 313 NewCallback(this, &BufferedDataSource::PartialReadStartCallback), | |
| 314 base::Bind(&BufferedDataSource::NetworkEventCallback, this), | |
| 315 frame_); | |
| 316 } | |
| 317 | |
| 318 void BufferedDataSource::SetPlaybackRateTask(float playback_rate) { | |
| 319 DCHECK(MessageLoop::current() == render_loop_); | |
| 320 DCHECK(loader_.get()); | |
| 321 | |
| 322 playback_rate_ = playback_rate; | |
| 323 loader_->SetPlaybackRate(playback_rate); | |
| 324 | |
| 325 bool previously_paused = media_is_paused_; | |
| 326 media_is_paused_ = (playback_rate == 0.0); | |
| 327 | |
| 328 if (!media_has_played_ && previously_paused && !media_is_paused_) | |
| 329 media_has_played_ = true; | |
| 330 | |
| 331 BufferedResourceLoader::DeferStrategy strategy = ChooseDeferStrategy(); | |
| 332 loader_->UpdateDeferStrategy(strategy); | |
| 333 } | |
| 334 | |
| 335 void BufferedDataSource::SetPreloadTask(media::Preload preload) { | |
| 336 DCHECK(MessageLoop::current() == render_loop_); | |
| 337 preload_ = preload; | |
| 338 } | |
| 339 | |
| 340 void BufferedDataSource::SetBitrateTask(int bitrate) { | |
| 341 DCHECK(MessageLoop::current() == render_loop_); | |
| 342 DCHECK(loader_.get()); | |
| 343 | |
| 344 bitrate_ = bitrate; | |
| 345 loader_->SetBitrate(bitrate); | |
| 346 } | |
| 347 | |
| 348 BufferedResourceLoader::DeferStrategy | |
| 349 BufferedDataSource::ChooseDeferStrategy() { | |
| 350 DCHECK(MessageLoop::current() == render_loop_); | |
| 351 // If the page indicated preload=metadata, then load exactly what is needed | |
| 352 // needed for starting playback. | |
| 353 if (!media_has_played_ && preload_ == media::METADATA) | |
| 354 return BufferedResourceLoader::kReadThenDefer; | |
| 355 | |
| 356 // If the playback has started (at which point the preload value is ignored) | |
| 357 // and we're paused, then try to load as much as possible. | |
| 358 if (media_has_played_ && media_is_paused_) | |
| 359 return BufferedResourceLoader::kNeverDefer; | |
| 360 | |
| 361 // If media is currently playing or the page indicated preload=auto, | |
| 362 // use threshold strategy to enable/disable deferring when the buffer | |
| 363 // is full/depleted. | |
| 364 return BufferedResourceLoader::kThresholdDefer; | |
| 365 } | |
| 366 | |
| 367 // This method is the place where actual read happens, |loader_| must be valid | |
| 368 // prior to make this method call. | |
| 369 void BufferedDataSource::ReadInternal() { | |
| 370 DCHECK(MessageLoop::current() == render_loop_); | |
| 371 DCHECK(loader_); | |
| 372 | |
| 373 // First we prepare the intermediate read buffer for BufferedResourceLoader | |
| 374 // to write to. | |
| 375 if (read_size_ > intermediate_read_buffer_size_) { | |
| 376 intermediate_read_buffer_.reset(new uint8[read_size_]); | |
| 377 } | |
| 378 | |
| 379 // Perform the actual read with BufferedResourceLoader. | |
| 380 loader_->Read(read_position_, read_size_, intermediate_read_buffer_.get(), | |
| 381 NewCallback(this, &BufferedDataSource::ReadCallback)); | |
| 382 } | |
| 383 | |
| 384 // Method to report the results of the current read request. Also reset all | |
| 385 // the read parameters. | |
| 386 void BufferedDataSource::DoneRead_Locked(int error) { | |
| 387 VLOG(1) << "DoneRead: " << error << " bytes"; | |
| 388 | |
| 389 DCHECK(MessageLoop::current() == render_loop_); | |
| 390 DCHECK(!read_callback_.is_null()); | |
| 391 lock_.AssertAcquired(); | |
| 392 | |
| 393 if (error >= 0) { | |
| 394 read_callback_.Run(static_cast<size_t>(error)); | |
| 395 } else { | |
| 396 read_callback_.Run(kReadError); | |
| 397 } | |
| 398 | |
| 399 read_callback_.Reset(); | |
| 400 read_position_ = 0; | |
| 401 read_size_ = 0; | |
| 402 read_buffer_ = 0; | |
| 403 } | |
| 404 | |
| 405 void BufferedDataSource::DoneInitialization_Locked( | |
| 406 media::PipelineStatus status) { | |
| 407 DCHECK(MessageLoop::current() == render_loop_); | |
| 408 DCHECK(!initialize_cb_.is_null()); | |
| 409 lock_.AssertAcquired(); | |
| 410 | |
| 411 initialize_cb_.Run(status); | |
| 412 initialize_cb_.Reset(); | |
| 413 } | |
| 414 | |
| 415 ///////////////////////////////////////////////////////////////////////////// | |
| 416 // BufferedResourceLoader callback methods. | |
| 417 void BufferedDataSource::HttpInitialStartCallback(int error) { | |
| 418 DCHECK(MessageLoop::current() == render_loop_); | |
| 419 DCHECK(loader_.get()); | |
| 420 | |
| 421 int64 instance_size = loader_->instance_size(); | |
| 422 bool success = error == net::OK; | |
| 423 | |
| 424 bool initialize_cb_is_null = false; | |
| 425 { | |
| 426 base::AutoLock auto_lock(lock_); | |
| 427 initialize_cb_is_null = initialize_cb_.is_null(); | |
| 428 } | |
| 429 if (initialize_cb_is_null) { | |
| 430 loader_->Stop(); | |
| 431 return; | |
| 432 } | |
| 433 | |
| 434 if (success) { | |
| 435 // TODO(hclam): Needs more thinking about supporting servers without range | |
| 436 // request or their partial response is not complete. | |
| 437 total_bytes_ = instance_size; | |
| 438 loaded_ = false; | |
| 439 streaming_ = (instance_size == kPositionNotSpecified) || | |
| 440 !loader_->range_supported(); | |
| 441 } else { | |
| 442 // TODO(hclam): In case of failure, we can retry several times. | |
| 443 loader_->Stop(); | |
| 444 } | |
| 445 | |
| 446 if (error == net::ERR_INVALID_RESPONSE && using_range_request_) { | |
| 447 // Assuming that the Range header was causing the problem. Retry without | |
| 448 // the Range header. | |
| 449 using_range_request_ = false; | |
| 450 loader_ = CreateResourceLoader(kPositionNotSpecified, | |
| 451 kPositionNotSpecified); | |
| 452 loader_->Start( | |
| 453 NewCallback(this, &BufferedDataSource::HttpInitialStartCallback), | |
| 454 base::Bind(&BufferedDataSource::NetworkEventCallback, this), | |
| 455 frame_); | |
| 456 return; | |
| 457 } | |
| 458 | |
| 459 // Reference to prevent destruction while inside the |initialize_cb_| | |
| 460 // call. This is a temporary fix to prevent crashes caused by holding the | |
| 461 // lock and running the destructor. | |
| 462 // TODO: Review locking in this class and figure out a way to run the callback | |
| 463 // w/o the lock. | |
| 464 scoped_refptr<BufferedDataSource> destruction_guard(this); | |
| 465 { | |
| 466 // We need to prevent calling to filter host and running the callback if | |
| 467 // we have received the stop signal. We need to lock down the whole callback | |
| 468 // method to prevent bad things from happening. The reason behind this is | |
| 469 // that we cannot guarantee tasks on render thread have completely stopped | |
| 470 // when we receive the Stop() method call. The only way to solve this is to | |
| 471 // let tasks on render thread to run but make sure they don't call outside | |
| 472 // this object when Stop() method is ever called. Locking this method is | |
| 473 // safe because |lock_| is only acquired in tasks on render thread. | |
| 474 base::AutoLock auto_lock(lock_); | |
| 475 if (stop_signal_received_) | |
| 476 return; | |
| 477 | |
| 478 if (!success) { | |
| 479 DoneInitialization_Locked(media::PIPELINE_ERROR_NETWORK); | |
| 480 return; | |
| 481 } | |
| 482 | |
| 483 UpdateHostState_Locked(); | |
| 484 DoneInitialization_Locked(media::PIPELINE_OK); | |
| 485 } | |
| 486 } | |
| 487 | |
| 488 void BufferedDataSource::NonHttpInitialStartCallback(int error) { | |
| 489 DCHECK(MessageLoop::current() == render_loop_); | |
| 490 DCHECK(loader_.get()); | |
| 491 | |
| 492 bool initialize_cb_is_null = false; | |
| 493 { | |
| 494 base::AutoLock auto_lock(lock_); | |
| 495 initialize_cb_is_null = initialize_cb_.is_null(); | |
| 496 } | |
| 497 if (initialize_cb_is_null) { | |
| 498 loader_->Stop(); | |
| 499 return; | |
| 500 } | |
| 501 | |
| 502 int64 instance_size = loader_->instance_size(); | |
| 503 bool success = error == net::OK && instance_size != kPositionNotSpecified; | |
| 504 | |
| 505 if (success) { | |
| 506 total_bytes_ = instance_size; | |
| 507 buffered_bytes_ = total_bytes_; | |
| 508 loaded_ = true; | |
| 509 } else { | |
| 510 loader_->Stop(); | |
| 511 } | |
| 512 | |
| 513 // Reference to prevent destruction while inside the |initialize_cb_| | |
| 514 // call. This is a temporary fix to prevent crashes caused by holding the | |
| 515 // lock and running the destructor. | |
| 516 // TODO: Review locking in this class and figure out a way to run the callback | |
| 517 // w/o the lock. | |
| 518 scoped_refptr<BufferedDataSource> destruction_guard(this); | |
| 519 { | |
| 520 // We need to prevent calling to filter host and running the callback if | |
| 521 // we have received the stop signal. We need to lock down the whole callback | |
| 522 // method to prevent bad things from happening. The reason behind this is | |
| 523 // that we cannot guarantee tasks on render thread have completely stopped | |
| 524 // when we receive the Stop() method call. The only way to solve this is to | |
| 525 // let tasks on render thread to run but make sure they don't call outside | |
| 526 // this object when Stop() method is ever called. Locking this method is | |
| 527 // safe because |lock_| is only acquired in tasks on render thread. | |
| 528 base::AutoLock auto_lock(lock_); | |
| 529 if (stop_signal_received_ || initialize_cb_.is_null()) | |
| 530 return; | |
| 531 | |
| 532 if (!success) { | |
| 533 DoneInitialization_Locked(media::PIPELINE_ERROR_NETWORK); | |
| 534 return; | |
| 535 } | |
| 536 | |
| 537 UpdateHostState_Locked(); | |
| 538 DoneInitialization_Locked(media::PIPELINE_OK); | |
| 539 } | |
| 540 } | |
| 541 | |
| 542 void BufferedDataSource::PartialReadStartCallback(int error) { | |
| 543 DCHECK(MessageLoop::current() == render_loop_); | |
| 544 DCHECK(loader_.get()); | |
| 545 | |
| 546 if (error == net::OK) { | |
| 547 // Once the request has started successfully, we can proceed with | |
| 548 // reading from it. | |
| 549 ReadInternal(); | |
| 550 return; | |
| 551 } | |
| 552 | |
| 553 // Stop the resource loader since we have received an error. | |
| 554 loader_->Stop(); | |
| 555 | |
| 556 // We need to prevent calling to filter host and running the callback if | |
| 557 // we have received the stop signal. We need to lock down the whole callback | |
| 558 // method to prevent bad things from happening. The reason behind this is | |
| 559 // that we cannot guarantee tasks on render thread have completely stopped | |
| 560 // when we receive the Stop() method call. So only way to solve this is to | |
| 561 // let tasks on render thread to run but make sure they don't call outside | |
| 562 // this object when Stop() method is ever called. Locking this method is | |
| 563 // safe because |lock_| is only acquired in tasks on render thread. | |
| 564 base::AutoLock auto_lock(lock_); | |
| 565 if (stop_signal_received_) | |
| 566 return; | |
| 567 DoneRead_Locked(net::ERR_INVALID_RESPONSE); | |
| 568 } | |
| 569 | |
| 570 void BufferedDataSource::ReadCallback(int error) { | |
| 571 DCHECK(MessageLoop::current() == render_loop_); | |
| 572 | |
| 573 if (error < 0) { | |
| 574 DCHECK(loader_.get()); | |
| 575 | |
| 576 // Stop the resource load if it failed. | |
| 577 loader_->Stop(); | |
| 578 | |
| 579 if (error == net::ERR_CACHE_MISS && cache_miss_retries_left_ > 0) { | |
| 580 cache_miss_retries_left_--; | |
| 581 render_loop_->PostTask(FROM_HERE, | |
| 582 base::Bind(&BufferedDataSource::RestartLoadingTask, this)); | |
| 583 return; | |
| 584 } | |
| 585 } | |
| 586 | |
| 587 // We need to prevent calling to filter host and running the callback if | |
| 588 // we have received the stop signal. We need to lock down the whole callback | |
| 589 // method to prevent bad things from happening. The reason behind this is | |
| 590 // that we cannot guarantee tasks on render thread have completely stopped | |
| 591 // when we receive the Stop() method call. So only way to solve this is to | |
| 592 // let tasks on render thread to run but make sure they don't call outside | |
| 593 // this object when Stop() method is ever called. Locking this method is safe | |
| 594 // because |lock_| is only acquired in tasks on render thread. | |
| 595 base::AutoLock auto_lock(lock_); | |
| 596 if (stop_signal_received_) | |
| 597 return; | |
| 598 | |
| 599 if (error > 0) { | |
| 600 // If a position error code is received, read was successful. So copy | |
| 601 // from intermediate read buffer to the target read buffer. | |
| 602 memcpy(read_buffer_, intermediate_read_buffer_.get(), error); | |
| 603 } else if (error == 0 && total_bytes_ == kPositionNotSpecified) { | |
| 604 // We've reached the end of the file and we didn't know the total size | |
| 605 // before. Update the total size so Read()s past the end of the file will | |
| 606 // fail like they would if we had known the file size at the beginning. | |
| 607 total_bytes_ = loader_->instance_size(); | |
| 608 | |
| 609 if (host() && total_bytes_ != kPositionNotSpecified) | |
| 610 host()->SetTotalBytes(total_bytes_); | |
| 611 } | |
| 612 DoneRead_Locked(error); | |
| 613 } | |
| 614 | |
| 615 void BufferedDataSource::NetworkEventCallback() { | |
| 616 DCHECK(MessageLoop::current() == render_loop_); | |
| 617 DCHECK(loader_.get()); | |
| 618 | |
| 619 // In case of non-HTTP request we don't need to report network events, | |
| 620 // so return immediately. | |
| 621 if (loaded_) | |
| 622 return; | |
| 623 | |
| 624 bool is_downloading_data = loader_->is_downloading_data(); | |
| 625 int64 buffered_position = loader_->GetBufferedPosition(); | |
| 626 | |
| 627 // If we get an unspecified value, return immediately. | |
| 628 if (buffered_position == kPositionNotSpecified) | |
| 629 return; | |
| 630 | |
| 631 // We need to prevent calling to filter host and running the callback if | |
| 632 // we have received the stop signal. We need to lock down the whole callback | |
| 633 // method to prevent bad things from happening. The reason behind this is | |
| 634 // that we cannot guarantee tasks on render thread have completely stopped | |
| 635 // when we receive the Stop() method call. So only way to solve this is to | |
| 636 // let tasks on render thread to run but make sure they don't call outside | |
| 637 // this object when Stop() method is ever called. Locking this method is safe | |
| 638 // because |lock_| is only acquired in tasks on render thread. | |
| 639 base::AutoLock auto_lock(lock_); | |
| 640 if (stop_signal_received_) | |
| 641 return; | |
| 642 | |
| 643 if (is_downloading_data != is_downloading_data_) { | |
| 644 is_downloading_data_ = is_downloading_data; | |
| 645 if (host()) | |
| 646 host()->SetNetworkActivity(is_downloading_data); | |
| 647 } | |
| 648 | |
| 649 buffered_bytes_ = buffered_position + 1; | |
| 650 if (host()) | |
| 651 host()->SetBufferedBytes(buffered_bytes_); | |
| 652 } | |
| 653 | |
| 654 void BufferedDataSource::UpdateHostState_Locked() { | |
| 655 // Called from various threads, under lock. | |
| 656 lock_.AssertAcquired(); | |
| 657 | |
| 658 media::FilterHost* filter_host = host(); | |
| 659 if (!filter_host) | |
| 660 return; | |
| 661 | |
| 662 filter_host->SetLoaded(loaded_); | |
| 663 | |
| 664 if (streaming_) { | |
| 665 filter_host->SetStreaming(true); | |
| 666 } else { | |
| 667 filter_host->SetTotalBytes(total_bytes_); | |
| 668 filter_host->SetBufferedBytes(buffered_bytes_); | |
| 669 } | |
| 670 } | |
| 671 | |
| 672 } // namespace webkit_glue | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 8570010:
Moving media-related files from webkit/glue/ to webkit/media/. (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src