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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/audio/audio_output_resampler.h" | 5 #include "media/audio/audio_output_resampler.h" |
6 | 6 |
7 #include "base/bind.h" | 7 #include "base/bind.h" |
8 #include "base/bind_helpers.h" | 8 #include "base/bind_helpers.h" |
9 #include "base/compiler_specific.h" | 9 #include "base/compiler_specific.h" |
10 #include "base/metrics/histogram.h" | 10 #include "base/metrics/histogram.h" |
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33 AudioBuffersState buffers_state) OVERRIDE; | 33 AudioBuffersState buffers_state) OVERRIDE; |
34 virtual void OnError(AudioOutputStream* stream) OVERRIDE; | 34 virtual void OnError(AudioOutputStream* stream) OVERRIDE; |
35 | 35 |
36 // Sets |source_callback_|. If this is not a new object, then Stop() must be | 36 // Sets |source_callback_|. If this is not a new object, then Stop() must be |
37 // called before Start(). | 37 // called before Start(). |
38 void Start(AudioOutputStream::AudioSourceCallback* callback); | 38 void Start(AudioOutputStream::AudioSourceCallback* callback); |
39 | 39 |
40 // Clears |source_callback_| and flushes the resampler. | 40 // Clears |source_callback_| and flushes the resampler. |
41 void Stop(); | 41 void Stop(); |
42 | 42 |
43 bool started() { return source_callback_ != NULL; } | 43 bool started() { return source_callback_ != nullptr; } |
44 | 44 |
45 private: | 45 private: |
46 // AudioConverter::InputCallback implementation. | 46 // AudioConverter::InputCallback implementation. |
47 virtual double ProvideInput(AudioBus* audio_bus, | 47 virtual double ProvideInput(AudioBus* audio_bus, |
48 base::TimeDelta buffer_delay) OVERRIDE; | 48 base::TimeDelta buffer_delay) OVERRIDE; |
49 | 49 |
50 // Ratio of input bytes to output bytes used to correct playback delay with | 50 // Ratio of input bytes to output bytes used to correct playback delay with |
51 // regard to buffering and resampling. | 51 // regard to buffering and resampling. |
52 const double io_ratio_; | 52 const double io_ratio_; |
53 | 53 |
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230 } | 230 } |
231 | 231 |
232 return false; | 232 return false; |
233 } | 233 } |
234 | 234 |
235 bool AudioOutputResampler::StartStream( | 235 bool AudioOutputResampler::StartStream( |
236 AudioOutputStream::AudioSourceCallback* callback, | 236 AudioOutputStream::AudioSourceCallback* callback, |
237 AudioOutputProxy* stream_proxy) { | 237 AudioOutputProxy* stream_proxy) { |
238 DCHECK(task_runner_->BelongsToCurrentThread()); | 238 DCHECK(task_runner_->BelongsToCurrentThread()); |
239 | 239 |
240 OnMoreDataConverter* resampler_callback = NULL; | 240 OnMoreDataConverter* resampler_callback = nullptr; |
241 CallbackMap::iterator it = callbacks_.find(stream_proxy); | 241 CallbackMap::iterator it = callbacks_.find(stream_proxy); |
242 if (it == callbacks_.end()) { | 242 if (it == callbacks_.end()) { |
243 resampler_callback = new OnMoreDataConverter(params_, output_params_); | 243 resampler_callback = new OnMoreDataConverter(params_, output_params_); |
244 callbacks_[stream_proxy] = resampler_callback; | 244 callbacks_[stream_proxy] = resampler_callback; |
245 } else { | 245 } else { |
246 resampler_callback = it->second; | 246 resampler_callback = it->second; |
247 } | 247 } |
248 | 248 |
249 resampler_callback->Start(callback); | 249 resampler_callback->Start(callback); |
250 bool result = dispatcher_->StartStream(resampler_callback, stream_proxy); | 250 bool result = dispatcher_->StartStream(resampler_callback, stream_proxy); |
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292 DCHECK(HasOneRef()) << "Only the AudioManager should hold a reference"; | 292 DCHECK(HasOneRef()) << "Only the AudioManager should hold a reference"; |
293 | 293 |
294 dispatcher_->Shutdown(); | 294 dispatcher_->Shutdown(); |
295 DCHECK(callbacks_.empty()); | 295 DCHECK(callbacks_.empty()); |
296 } | 296 } |
297 | 297 |
298 OnMoreDataConverter::OnMoreDataConverter(const AudioParameters& input_params, | 298 OnMoreDataConverter::OnMoreDataConverter(const AudioParameters& input_params, |
299 const AudioParameters& output_params) | 299 const AudioParameters& output_params) |
300 : io_ratio_(static_cast<double>(input_params.GetBytesPerSecond()) / | 300 : io_ratio_(static_cast<double>(input_params.GetBytesPerSecond()) / |
301 output_params.GetBytesPerSecond()), | 301 output_params.GetBytesPerSecond()), |
302 source_callback_(NULL), | 302 source_callback_(nullptr), |
303 input_bytes_per_second_(input_params.GetBytesPerSecond()), | 303 input_bytes_per_second_(input_params.GetBytesPerSecond()), |
304 audio_converter_(input_params, output_params, false) {} | 304 audio_converter_(input_params, output_params, false) {} |
305 | 305 |
306 OnMoreDataConverter::~OnMoreDataConverter() { | 306 OnMoreDataConverter::~OnMoreDataConverter() { |
307 // Ensure Stop() has been called so we don't end up with an AudioOutputStream | 307 // Ensure Stop() has been called so we don't end up with an AudioOutputStream |
308 // calling back into OnMoreData() after destruction. | 308 // calling back into OnMoreData() after destruction. |
309 CHECK(!source_callback_); | 309 CHECK(!source_callback_); |
310 } | 310 } |
311 | 311 |
312 void OnMoreDataConverter::Start( | 312 void OnMoreDataConverter::Start( |
313 AudioOutputStream::AudioSourceCallback* callback) { | 313 AudioOutputStream::AudioSourceCallback* callback) { |
314 CHECK(!source_callback_); | 314 CHECK(!source_callback_); |
315 source_callback_ = callback; | 315 source_callback_ = callback; |
316 | 316 |
317 // While AudioConverter can handle multiple inputs, we're using it only with | 317 // While AudioConverter can handle multiple inputs, we're using it only with |
318 // a single input currently. Eventually this may be the basis for a browser | 318 // a single input currently. Eventually this may be the basis for a browser |
319 // side mixer. | 319 // side mixer. |
320 audio_converter_.AddInput(this); | 320 audio_converter_.AddInput(this); |
321 } | 321 } |
322 | 322 |
323 void OnMoreDataConverter::Stop() { | 323 void OnMoreDataConverter::Stop() { |
324 CHECK(source_callback_); | 324 CHECK(source_callback_); |
325 source_callback_ = NULL; | 325 source_callback_ = nullptr; |
326 audio_converter_.RemoveInput(this); | 326 audio_converter_.RemoveInput(this); |
327 } | 327 } |
328 | 328 |
329 int OnMoreDataConverter::OnMoreData(AudioBus* dest, | 329 int OnMoreDataConverter::OnMoreData(AudioBus* dest, |
330 AudioBuffersState buffers_state) { | 330 AudioBuffersState buffers_state) { |
331 current_buffers_state_ = buffers_state; | 331 current_buffers_state_ = buffers_state; |
332 audio_converter_.Convert(dest); | 332 audio_converter_.Convert(dest); |
333 | 333 |
334 // Always return the full number of frames requested, ProvideInput() | 334 // Always return the full number of frames requested, ProvideInput() |
335 // will pad with silence if it wasn't able to acquire enough data. | 335 // will pad with silence if it wasn't able to acquire enough data. |
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354 if (frames > 0 && frames < dest->frames()) | 354 if (frames > 0 && frames < dest->frames()) |
355 dest->ZeroFramesPartial(frames, dest->frames() - frames); | 355 dest->ZeroFramesPartial(frames, dest->frames() - frames); |
356 return frames > 0 ? 1 : 0; | 356 return frames > 0 ? 1 : 0; |
357 } | 357 } |
358 | 358 |
359 void OnMoreDataConverter::OnError(AudioOutputStream* stream) { | 359 void OnMoreDataConverter::OnError(AudioOutputStream* stream) { |
360 source_callback_->OnError(stream); | 360 source_callback_->OnError(stream); |
361 } | 361 } |
362 | 362 |
363 } // namespace media | 363 } // namespace media |
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