15f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Copyright 2014 The Chromium Authors. All rights reserved. 25f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// found in the LICENSE file. 45f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 55f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include "media/base/wall_clock_time_source.h" 65f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 75f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include "base/logging.h" 85f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include "base/time/default_tick_clock.h" 95f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)namespace media { 115f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 125f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)WallClockTimeSource::WallClockTimeSource() 135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) : tick_clock_(new base::DefaultTickClock()), 145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ticking_(false), 155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) playback_rate_(1.0f) { 165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)WallClockTimeSource::~WallClockTimeSource() { 195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)void WallClockTimeSource::StartTicking() { 221320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci DVLOG(1) << __FUNCTION__; 231320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci base::AutoLock auto_lock(lock_); 245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) DCHECK(!ticking_); 255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ticking_ = true; 265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) reference_wall_ticks_ = tick_clock_->NowTicks(); 275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)void WallClockTimeSource::StopTicking() { 301320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci DVLOG(1) << __FUNCTION__; 311320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci base::AutoLock auto_lock(lock_); 325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) DCHECK(ticking_); 331320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci base_time_ = CurrentMediaTime_Locked(); 345f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ticking_ = false; 355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) reference_wall_ticks_ = tick_clock_->NowTicks(); 365f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)void WallClockTimeSource::SetPlaybackRate(float playback_rate) { 391320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci DVLOG(1) << __FUNCTION__ << "(" << playback_rate << ")"; 401320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci base::AutoLock auto_lock(lock_); 415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Estimate current media time using old rate to use as a new base time for 425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // the new rate. 435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (ticking_) { 441320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci base_time_ = CurrentMediaTime_Locked(); 455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) reference_wall_ticks_ = tick_clock_->NowTicks(); 465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) playback_rate_ = playback_rate; 495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)void WallClockTimeSource::SetMediaTime(base::TimeDelta time) { 521320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci DVLOG(1) << __FUNCTION__ << "(" << time.InMicroseconds() << ")"; 531320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci base::AutoLock auto_lock(lock_); 545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) CHECK(!ticking_); 555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) base_time_ = time; 565f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 575f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 585f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)base::TimeDelta WallClockTimeSource::CurrentMediaTime() { 591320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci base::AutoLock auto_lock(lock_); 601320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci return CurrentMediaTime_Locked(); 611320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci} 621320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci 631320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tuccibase::TimeDelta WallClockTimeSource::CurrentMediaTimeForSyncingVideo() { 641320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci return CurrentMediaTime(); 651320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci} 661320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci 671320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tuccivoid WallClockTimeSource::SetTickClockForTesting( 681320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci scoped_ptr<base::TickClock> tick_clock) { 691320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci tick_clock_.swap(tick_clock); 701320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci} 711320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci 721320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tuccibase::TimeDelta WallClockTimeSource::CurrentMediaTime_Locked() { 731320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci lock_.AssertAcquired(); 745f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!ticking_) 755f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return base_time_; 765f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 775f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) base::TimeTicks now = tick_clock_->NowTicks(); 785f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return base_time_ + 795f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) base::TimeDelta::FromMicroseconds( 805f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) (now - reference_wall_ticks_).InMicroseconds() * playback_rate_); 815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 835f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} // namespace media 84