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 #include "content/renderer/media/html_audio_element_capturer_source.h" | |
6 | |
7 #include "base/threading/thread_task_runner_handle.h" | |
8 #include "media/base/audio_parameters.h" | |
9 #include "media/base/audio_renderer_sink.h" | |
10 #include "media/blink/webaudiosourceprovider_impl.h" | |
11 #include "media/blink/webmediaplayer_impl.h" | |
12 #include "third_party/WebKit/public/platform/WebMediaPlayer.h" | |
13 | |
14 namespace content { | |
15 | |
16 //static | |
17 HtmlAudioElementCapturerSource* | |
18 HtmlAudioElementCapturerSource::CreateFromWebMediaPlayerImpl( | |
19 blink::WebMediaPlayer* player) { | |
20 DCHECK(player); | |
21 return new HtmlAudioElementCapturerSource( | |
22 static_cast<media::WebAudioSourceProviderImpl*>( | |
23 player->getAudioSourceProvider())); | |
24 } | |
25 | |
26 HtmlAudioElementCapturerSource::HtmlAudioElementCapturerSource( | |
27 media::WebAudioSourceProviderImpl* audio_source) | |
28 : MediaStreamAudioSource(true /* is_local_source */), | |
29 audio_source_(audio_source), | |
30 is_started_(false), | |
31 last_sample_rate_(0), | |
32 last_num_channels_(0), | |
33 last_bus_frames_(0) { | |
34 DCHECK(audio_source_); | |
35 } | |
36 | |
37 HtmlAudioElementCapturerSource::~HtmlAudioElementCapturerSource() { | |
38 DCHECK(thread_checker_.CalledOnValidThread()); | |
39 EnsureSourceIsStopped(); | |
40 } | |
41 | |
42 bool HtmlAudioElementCapturerSource::EnsureSourceIsStarted() { | |
43 DCHECK(thread_checker_.CalledOnValidThread()); | |
44 if (audio_source_ && !is_started_) { | |
45 // base:Unretained() is safe here since EnsureSourceIsStopped() guarantees | |
46 // no more calls to OnAudioBus(). | |
47 audio_source_->SetCopyAudioCallback(base::Bind( | |
48 &HtmlAudioElementCapturerSource::OnAudioBus, base::Unretained(this))); | |
49 is_started_ = true; | |
50 } | |
51 return is_started_; | |
52 } | |
53 | |
54 void HtmlAudioElementCapturerSource::EnsureSourceIsStopped() { | |
55 DCHECK(thread_checker_.CalledOnValidThread()); | |
56 if (!is_started_) | |
57 return; | |
58 | |
59 if (audio_source_) { | |
60 audio_source_->ClearCopyAudioCallback(); | |
61 audio_source_ = nullptr; | |
62 } | |
63 is_started_ = false; | |
64 } | |
65 | |
66 void HtmlAudioElementCapturerSource::OnAudioBus( | |
67 std::unique_ptr<media::AudioBus> audio_bus, | |
68 uint32_t delay_milliseconds, | |
69 int sample_rate) { | |
70 const base::TimeTicks capture_time = | |
71 base::TimeTicks::Now() - | |
72 base::TimeDelta::FromMilliseconds(delay_milliseconds); | |
73 | |
74 if (sample_rate != last_sample_rate_ || | |
75 audio_bus->channels() != last_num_channels_ || | |
76 audio_bus->frames() != last_bus_frames_) { | |
77 MediaStreamAudioSource::SetFormat( | |
78 media::AudioParameters(media::AudioParameters::AUDIO_PCM_LOW_LATENCY, | |
79 media::GuessChannelLayout(audio_bus->channels()), | |
80 sample_rate, 16, audio_bus->frames())); | |
81 last_sample_rate_ = sample_rate; | |
82 last_num_channels_ = audio_bus->channels(); | |
83 last_bus_frames_ = audio_bus->frames(); | |
84 } | |
85 | |
86 MediaStreamAudioSource::DeliverDataToTracks(*audio_bus, capture_time); | |
87 } | |
88 | |
89 } // namespace content | |
OLD | NEW |