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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 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 <cmath> | 5 #include <cmath> |
6 | 6 |
7 #include "media/base/filter_host.h" | 7 #include "media/base/filter_host.h" |
8 #include "media/filters/null_audio_renderer.h" | 8 #include "media/filters/null_audio_renderer.h" |
9 | 9 |
10 namespace media { | 10 namespace media { |
11 | 11 |
12 // How "long" our buffer should be in terms of milliseconds. In OnInitialize | 12 // How "long" our buffer should be in terms of milliseconds. In OnInitialize |
13 // we calculate the size of one second of audio data and use this number to | 13 // we calculate the size of one second of audio data and use this number to |
14 // allocate a buffer to pass to FillBuffer. | 14 // allocate a buffer to pass to FillBuffer. |
15 static const size_t kBufferSizeInMilliseconds = 100; | 15 static const size_t kBufferSizeInMilliseconds = 100; |
16 | 16 |
17 NullAudioRenderer::NullAudioRenderer() | 17 NullAudioRenderer::NullAudioRenderer() |
18 : AudioRendererBase(), | 18 : AudioRendererBase(), |
19 bytes_per_millisecond_(0), | 19 bytes_per_millisecond_(0), |
20 buffer_size_(0), | 20 buffer_size_(0), |
21 thread_(0), | 21 thread_(NULL), |
22 shutdown_(false) { | 22 shutdown_(false) { |
23 } | 23 } |
24 | 24 |
25 NullAudioRenderer::~NullAudioRenderer() { | 25 NullAudioRenderer::~NullAudioRenderer() { |
26 Stop(); | 26 Stop(); |
27 } | 27 } |
28 | 28 |
29 // static | 29 // static |
30 bool NullAudioRenderer::IsMediaFormatSupported( | 30 bool NullAudioRenderer::IsMediaFormatSupported( |
31 const MediaFormat& media_format) { | 31 const MediaFormat& media_format) { |
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82 | 82 |
83 // It's safe to start the thread now because it simply sleeps when playback | 83 // It's safe to start the thread now because it simply sleeps when playback |
84 // rate is 0.0f. | 84 // rate is 0.0f. |
85 return PlatformThread::Create(0, this, &thread_); | 85 return PlatformThread::Create(0, this, &thread_); |
86 } | 86 } |
87 | 87 |
88 void NullAudioRenderer::OnStop() { | 88 void NullAudioRenderer::OnStop() { |
89 shutdown_ = true; | 89 shutdown_ = true; |
90 if (thread_) { | 90 if (thread_) { |
91 PlatformThread::Join(thread_); | 91 PlatformThread::Join(thread_); |
92 thread_ = 0; | 92 thread_ = NULL; |
93 } | 93 } |
94 } | 94 } |
95 | 95 |
96 } // namespace media | 96 } // namespace media |
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