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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_decoder_opus.h" | 5 #include "remoting/codec/audio_decoder_opus.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "base/stl_util.h" | 8 #include "base/stl_util.h" |
9 #include "base/time/time.h" | 9 #include "base/time/time.h" |
10 #include "remoting/proto/audio.pb.h" | 10 #include "remoting/proto/audio.pb.h" |
11 #include "third_party/opus/src/include/opus.h" | 11 #include "third_party/opus/src/include/opus.h" |
12 | 12 |
13 namespace remoting { | 13 namespace remoting { |
14 | 14 |
15 namespace { | 15 namespace { |
16 | 16 |
17 // Maximum size of an Opus frame in milliseconds. | 17 // Maximum size of an Opus frame in milliseconds. |
18 const int kMaxFrameSizeMs = 120; | 18 const int kMaxFrameSizeMs = 120; |
19 | 19 |
20 // Hosts will never generate more than 100 frames in a single packet. | 20 // Hosts will never generate more than 100 frames in a single packet. |
21 const int kMaxFramesPerPacket = 100; | 21 const int kMaxFramesPerPacket = 100; |
22 | 22 |
23 const AudioPacket::SamplingRate kSamplingRate = | 23 const AudioPacket::SamplingRate kSamplingRate = |
24 AudioPacket::SAMPLING_RATE_48000; | 24 AudioPacket::SAMPLING_RATE_48000; |
25 | 25 |
26 } // namespace | 26 } // namespace |
27 | 27 |
28 AudioDecoderOpus::AudioDecoderOpus() | 28 AudioDecoderOpus::AudioDecoderOpus() |
29 : sampling_rate_(0), | 29 : sampling_rate_(0), channels_(0), decoder_(nullptr) { |
30 channels_(0), | |
31 decoder_(NULL) { | |
32 } | 30 } |
33 | 31 |
34 AudioDecoderOpus::~AudioDecoderOpus() { | 32 AudioDecoderOpus::~AudioDecoderOpus() { |
35 DestroyDecoder(); | 33 DestroyDecoder(); |
36 } | 34 } |
37 | 35 |
38 void AudioDecoderOpus::InitDecoder() { | 36 void AudioDecoderOpus::InitDecoder() { |
39 DCHECK(!decoder_); | 37 DCHECK(!decoder_); |
40 int error; | 38 int error; |
41 decoder_ = opus_decoder_create(kSamplingRate, channels_, &error); | 39 decoder_ = opus_decoder_create(kSamplingRate, channels_, &error); |
42 if (!decoder_) { | 40 if (!decoder_) { |
43 LOG(ERROR) << "Failed to create OPUS decoder; Error code: " << error; | 41 LOG(ERROR) << "Failed to create OPUS decoder; Error code: " << error; |
44 } | 42 } |
45 } | 43 } |
46 | 44 |
47 void AudioDecoderOpus::DestroyDecoder() { | 45 void AudioDecoderOpus::DestroyDecoder() { |
48 if (decoder_) { | 46 if (decoder_) { |
49 opus_decoder_destroy(decoder_); | 47 opus_decoder_destroy(decoder_); |
50 decoder_ = NULL; | 48 decoder_ = nullptr; |
51 } | 49 } |
52 } | 50 } |
53 | 51 |
54 bool AudioDecoderOpus::ResetForPacket(AudioPacket* packet) { | 52 bool AudioDecoderOpus::ResetForPacket(AudioPacket* packet) { |
55 if (packet->channels() != channels_ || | 53 if (packet->channels() != channels_ || |
56 packet->sampling_rate() != sampling_rate_) { | 54 packet->sampling_rate() != sampling_rate_) { |
57 DestroyDecoder(); | 55 DestroyDecoder(); |
58 | 56 |
59 channels_ = packet->channels(); | 57 channels_ = packet->channels(); |
60 sampling_rate_ = packet->sampling_rate(); | 58 sampling_rate_ = packet->sampling_rate(); |
61 | 59 |
62 if (channels_ <= 0 || channels_ > 2 || | 60 if (channels_ <= 0 || channels_ > 2 || |
63 sampling_rate_ != kSamplingRate) { | 61 sampling_rate_ != kSamplingRate) { |
64 LOG(WARNING) << "Unsupported OPUS parameters: " | 62 LOG(WARNING) << "Unsupported OPUS parameters: " |
65 << channels_ << " channels with " | 63 << channels_ << " channels with " |
66 << sampling_rate_ << " samples per second."; | 64 << sampling_rate_ << " samples per second."; |
67 return false; | 65 return false; |
68 } | 66 } |
69 } | 67 } |
70 | 68 |
71 if (!decoder_) { | 69 if (!decoder_) { |
72 InitDecoder(); | 70 InitDecoder(); |
73 } | 71 } |
74 | 72 |
75 return decoder_ != NULL; | 73 return decoder_; |
76 } | 74 } |
77 | 75 |
78 | 76 |
79 scoped_ptr<AudioPacket> AudioDecoderOpus::Decode( | 77 scoped_ptr<AudioPacket> AudioDecoderOpus::Decode( |
80 scoped_ptr<AudioPacket> packet) { | 78 scoped_ptr<AudioPacket> packet) { |
81 if (packet->encoding() != AudioPacket::ENCODING_OPUS) { | 79 if (packet->encoding() != AudioPacket::ENCODING_OPUS) { |
82 LOG(WARNING) << "Received an audio packet with encoding " | 80 LOG(WARNING) << "Received an audio packet with encoding " |
83 << packet->encoding() << " when an OPUS packet was expected."; | 81 << packet->encoding() << " when an OPUS packet was expected."; |
84 return nullptr; | 82 return nullptr; |
85 } | 83 } |
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131 if (!buffer_pos) { | 129 if (!buffer_pos) { |
132 return nullptr; | 130 return nullptr; |
133 } | 131 } |
134 | 132 |
135 decoded_data->resize(buffer_pos); | 133 decoded_data->resize(buffer_pos); |
136 | 134 |
137 return decoded_packet.Pass(); | 135 return decoded_packet.Pass(); |
138 } | 136 } |
139 | 137 |
140 } // namespace remoting | 138 } // namespace remoting |
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