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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 "content/renderer/media/audio_hardware.h" | 5 #include "content/renderer/media/audio_hardware.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "content/common/view_messages.h" | 8 #include "content/common/view_messages.h" |
9 #include "content/renderer/render_thread_impl.h" | 9 #include "content/renderer/render_thread_impl.h" |
10 | 10 |
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42 uint32 buffer_size = 0; | 42 uint32 buffer_size = 0; |
43 RenderThreadImpl::current()->Send( | 43 RenderThreadImpl::current()->Send( |
44 new ViewHostMsg_GetHardwareBufferSize(&buffer_size)); | 44 new ViewHostMsg_GetHardwareBufferSize(&buffer_size)); |
45 output_buffer_size = buffer_size; | 45 output_buffer_size = buffer_size; |
46 } | 46 } |
47 | 47 |
48 return output_buffer_size; | 48 return output_buffer_size; |
49 } | 49 } |
50 | 50 |
51 size_t GetHighLatencyOutputBufferSize(int sample_rate) { | 51 size_t GetHighLatencyOutputBufferSize(int sample_rate) { |
| 52 // TODO(vrk/crogers): The buffer sizes that this function computes is probably |
| 53 // overly conservative. However, reducing the buffer size to 2048-8192 bytes |
| 54 // caused crbug.com/108396. This computation should be revisited while making |
| 55 // sure crbug.com/108396 doesn't happen again. |
| 56 |
52 // The minimum number of samples in a hardware packet. | 57 // The minimum number of samples in a hardware packet. |
53 // This value is selected so that we can handle down to 5khz sample rate. | 58 // This value is selected so that we can handle down to 5khz sample rate. |
54 static const size_t kMinSamplesPerHardwarePacket = 1024; | 59 static const size_t kMinSamplesPerHardwarePacket = 1024; |
55 | 60 |
56 // The maximum number of samples in a hardware packet. | 61 // The maximum number of samples in a hardware packet. |
57 // This value is selected so that we can handle up to 192khz sample rate. | 62 // This value is selected so that we can handle up to 192khz sample rate. |
58 static const size_t kMaxSamplesPerHardwarePacket = 64 * 1024; | 63 static const size_t kMaxSamplesPerHardwarePacket = 64 * 1024; |
59 | 64 |
60 // This constant governs the hardware audio buffer size, this value should be | 65 // This constant governs the hardware audio buffer size, this value should be |
61 // chosen carefully. | 66 // chosen carefully. |
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89 void ResetCache() { | 94 void ResetCache() { |
90 DCHECK(RenderThreadImpl::current() != NULL); | 95 DCHECK(RenderThreadImpl::current() != NULL); |
91 | 96 |
92 output_sample_rate = 0.0; | 97 output_sample_rate = 0.0; |
93 input_sample_rate = 0.0; | 98 input_sample_rate = 0.0; |
94 output_buffer_size = 0; | 99 output_buffer_size = 0; |
95 input_channel_count = 0; | 100 input_channel_count = 0; |
96 } | 101 } |
97 | 102 |
98 } // namespace audio_hardware | 103 } // namespace audio_hardware |
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