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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "media/renderers/audio_renderer_impl.h" | 5 #include "media/renderers/audio_renderer_impl.h" |
6 | 6 |
7 #include <math.h> | 7 #include <math.h> |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 #include <algorithm> | 9 #include <algorithm> |
10 #include <utility> | 10 #include <utility> |
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170 DCHECK(task_runner_->BelongsToCurrentThread()); | 170 DCHECK(task_runner_->BelongsToCurrentThread()); |
171 | 171 |
172 base::AutoLock auto_lock(lock_); | 172 base::AutoLock auto_lock(lock_); |
173 DCHECK(!rendering_); | 173 DCHECK(!rendering_); |
174 DCHECK_EQ(state_, kFlushed); | 174 DCHECK_EQ(state_, kFlushed); |
175 | 175 |
176 start_timestamp_ = time; | 176 start_timestamp_ = time; |
177 ended_timestamp_ = kInfiniteDuration; | 177 ended_timestamp_ = kInfiniteDuration; |
178 last_render_time_ = stop_rendering_time_ = base::TimeTicks(); | 178 last_render_time_ = stop_rendering_time_ = base::TimeTicks(); |
179 first_packet_timestamp_ = kNoTimestamp; | 179 first_packet_timestamp_ = kNoTimestamp; |
180 last_media_timestamp_ = base::TimeDelta(); | |
181 audio_clock_.reset(new AudioClock(time, audio_parameters_.sample_rate())); | 180 audio_clock_.reset(new AudioClock(time, audio_parameters_.sample_rate())); |
182 } | 181 } |
183 | 182 |
184 base::TimeDelta AudioRendererImpl::CurrentMediaTime() { | 183 base::TimeDelta AudioRendererImpl::CurrentMediaTime() { |
185 base::AutoLock auto_lock(lock_); | 184 base::AutoLock auto_lock(lock_); |
186 | 185 |
187 // Return the current time based on the known extents of the rendered audio | 186 // Return the current time based on the known extents of the rendered audio |
188 // data plus an estimate based on the last time those values were calculated. | 187 // data plus an estimate based on the last time those values were calculated. |
189 base::TimeDelta current_media_time = audio_clock_->front_timestamp(); | 188 base::TimeDelta current_media_time = audio_clock_->front_timestamp(); |
190 if (!last_render_time_.is_null()) { | 189 if (!last_render_time_.is_null()) { |
191 current_media_time += | 190 current_media_time += |
192 (tick_clock_->NowTicks() - last_render_time_) * playback_rate_; | 191 (tick_clock_->NowTicks() - last_render_time_) * playback_rate_; |
193 if (current_media_time > audio_clock_->back_timestamp()) | 192 if (current_media_time > audio_clock_->back_timestamp()) |
194 current_media_time = audio_clock_->back_timestamp(); | 193 current_media_time = audio_clock_->back_timestamp(); |
195 } | 194 } |
196 | 195 |
197 // Clamp current media time to the last reported value, this prevents higher | |
198 // level clients from seeing time go backwards based on inaccurate or spurious | |
199 // delay values reported to the AudioClock. | |
200 // | |
201 // It is expected that such events are transient and will be recovered as | |
202 // rendering continues over time. | |
203 if (current_media_time < last_media_timestamp_) { | |
204 DVLOG(2) << __func__ << ": " << last_media_timestamp_ | |
205 << " (clamped), actual: " << current_media_time; | |
206 return last_media_timestamp_; | |
207 } | |
208 | |
209 DVLOG(2) << __func__ << ": " << current_media_time; | |
210 last_media_timestamp_ = current_media_time; | |
211 return current_media_time; | 196 return current_media_time; |
212 } | 197 } |
213 | 198 |
214 bool AudioRendererImpl::GetWallClockTimes( | 199 bool AudioRendererImpl::GetWallClockTimes( |
215 const std::vector<base::TimeDelta>& media_timestamps, | 200 const std::vector<base::TimeDelta>& media_timestamps, |
216 std::vector<base::TimeTicks>* wall_clock_times) { | 201 std::vector<base::TimeTicks>* wall_clock_times) { |
217 base::AutoLock auto_lock(lock_); | 202 base::AutoLock auto_lock(lock_); |
218 DCHECK(wall_clock_times->empty()); | 203 DCHECK(wall_clock_times->empty()); |
219 | 204 |
220 // When playback is paused (rate is zero), assume a rate of 1.0. | 205 // When playback is paused (rate is zero), assume a rate of 1.0. |
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968 DCHECK_NE(buffering_state_, buffering_state); | 953 DCHECK_NE(buffering_state_, buffering_state); |
969 lock_.AssertAcquired(); | 954 lock_.AssertAcquired(); |
970 buffering_state_ = buffering_state; | 955 buffering_state_ = buffering_state; |
971 | 956 |
972 task_runner_->PostTask( | 957 task_runner_->PostTask( |
973 FROM_HERE, base::Bind(&AudioRendererImpl::OnBufferingStateChange, | 958 FROM_HERE, base::Bind(&AudioRendererImpl::OnBufferingStateChange, |
974 weak_factory_.GetWeakPtr(), buffering_state_)); | 959 weak_factory_.GetWeakPtr(), buffering_state_)); |
975 } | 960 } |
976 | 961 |
977 } // namespace media | 962 } // namespace media |
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