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| 1 // Copyright 2016 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 #ifndef CONTENT_RENDERER_MEDIA_HTML_AUDIO_ELEMENT_CAPTURER_SOURCE_H_ |
| 6 #define CONTENT_RENDERER_MEDIA_HTML_AUDIO_ELEMENT_CAPTURER_SOURCE_H_ |
| 7 |
| 8 #include "base/callback.h" |
| 9 #include "base/memory/weak_ptr.h" |
| 10 #include "base/threading/thread_checker.h" |
| 11 #include "content/common/content_export.h" |
| 12 #include "content/renderer/media/media_stream_audio_source.h" |
| 13 |
| 14 namespace blink { |
| 15 class WebMediaPlayer; |
| 16 } // namespace blink |
| 17 |
| 18 namespace media { |
| 19 class AudioBus; |
| 20 class WebAudioSourceProviderImpl; |
| 21 } // namespace media |
| 22 |
| 23 namespace content { |
| 24 |
| 25 // This class is a MediaStreamAudioSource that registers to the constructor- |
| 26 // passed weak WebAudioSourceProviderImpl to receive a copy of the audio data |
| 27 // intended for rendering. This copied data is received on OnAudioBus() and sent |
| 28 // to all the registered Tracks. |
| 29 class CONTENT_EXPORT HtmlAudioElementCapturerSource final |
| 30 : NON_EXPORTED_BASE(public MediaStreamAudioSource) { |
| 31 public: |
| 32 static HtmlAudioElementCapturerSource* |
| 33 CreateFromWebMediaPlayerImpl(blink::WebMediaPlayer* player); |
| 34 |
| 35 explicit HtmlAudioElementCapturerSource( |
| 36 media::WebAudioSourceProviderImpl* audio_source); |
| 37 ~HtmlAudioElementCapturerSource() override; |
| 38 |
| 39 private: |
| 40 // MediaStreamAudioSource implementation. |
| 41 bool EnsureSourceIsStarted() final; |
| 42 void EnsureSourceIsStopped() final; |
| 43 |
| 44 // To act as an WebAudioSourceProviderImpl::CopyAudioCB. |
| 45 void OnAudioBus(std::unique_ptr<media::AudioBus> audio_bus, |
| 46 uint32_t delay_milliseconds, |
| 47 int sample_rate); |
| 48 |
| 49 scoped_refptr<media::WebAudioSourceProviderImpl> audio_source_; |
| 50 |
| 51 bool is_started_; |
| 52 int last_sample_rate_; |
| 53 int last_num_channels_; |
| 54 int last_bus_frames_; |
| 55 |
| 56 base::ThreadChecker thread_checker_; |
| 57 |
| 58 DISALLOW_COPY_AND_ASSIGN(HtmlAudioElementCapturerSource); |
| 59 }; |
| 60 |
| 61 } // namespace content |
| 62 |
| 63 #endif // CONTENT_RENDERER_MEDIA_HTML_AUDIO_ELEMENT_CAPTURER_SOURCE_H_ |
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