OLD | NEW |
| (Empty) |
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_ | |
OLD | NEW |