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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 "remoting/codec/audio_encoder_opus.h" | 5 #include "remoting/codec/audio_encoder_opus.h" |
| 6 | 6 |
| 7 #include "base/bind.h" | 7 #include "base/bind.h" |
| 8 #include "base/logging.h" | 8 #include "base/logging.h" |
| 9 #include "base/time/time.h" | 9 #include "base/time/time.h" |
| 10 #include "media/base/audio_bus.h" | 10 #include "media/base/audio_bus.h" |
| 11 #include "media/base/multi_channel_resampler.h" | 11 #include "media/base/multi_channel_resampler.h" |
| 12 #include "third_party/opus/src/include/opus.h" | 12 #include "third_party/opus/src/include/opus.h" |
| 13 | 13 |
| 14 namespace remoting { | 14 namespace remoting { |
| 15 | 15 |
| 16 namespace { | 16 namespace { |
| 17 | 17 |
| 18 // Output 160 kb/s bitrate. | 18 // Output 160 kb/s bitrate. |
| 19 const int kOutputBitrateBps = 160 * 1024; | 19 const int kOutputBitrateBps = 160 * 1024; |
| 20 | 20 |
| 21 // Encoded buffer size. | |
| 22 const int kFrameDefaultBufferSize = 4096; | |
| 23 | |
| 24 // Maximum buffer size we'll allocate when encoding before giving up. | |
| 25 const int kMaxBufferSize = 65536; | |
| 26 | |
| 27 // Opus doesn't support 44100 sampling rate so we always resample to 48kHz. | 21 // Opus doesn't support 44100 sampling rate so we always resample to 48kHz. |
| 28 const AudioPacket::SamplingRate kOpusSamplingRate = | 22 const AudioPacket::SamplingRate kOpusSamplingRate = |
| 29 AudioPacket::SAMPLING_RATE_48000; | 23 AudioPacket::SAMPLING_RATE_48000; |
| 30 | 24 |
| 31 // Opus supports frame sizes of 2.5, 5, 10, 20, 40 and 60 ms. We use 20 ms | 25 // Opus supports frame sizes of 2.5, 5, 10, 20, 40 and 60 ms. We use 20 ms |
| 32 // frames to balance latency and efficiency. | 26 // frames to balance latency and efficiency. |
| 33 const int kFrameSizeMs = 20; | 27 const int kFrameSizeMs = 20; |
| 34 | 28 |
| 35 // Number of samples per frame when using default sampling rate. | 29 // Number of samples per frame when using default sampling rate. |
| 36 const int kFrameSamples = | 30 const int kFrameSamples = |
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| 235 } | 229 } |
| 236 | 230 |
| 237 // Return NULL if there's nothing in the packet. | 231 // Return NULL if there's nothing in the packet. |
| 238 if (encoded_packet->data_size() == 0) | 232 if (encoded_packet->data_size() == 0) |
| 239 return scoped_ptr<AudioPacket>(); | 233 return scoped_ptr<AudioPacket>(); |
| 240 | 234 |
| 241 return encoded_packet.Pass(); | 235 return encoded_packet.Pass(); |
| 242 } | 236 } |
| 243 | 237 |
| 244 } // namespace remoting | 238 } // namespace remoting |
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