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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/browser/speech/audio_encoder.h" | 5 #include "content/browser/speech/audio_encoder.h" |
6 | 6 |
7 #include "base/basictypes.h" | 7 #include "base/basictypes.h" |
8 #include "base/logging.h" | 8 #include "base/logging.h" |
9 #include "base/memory/scoped_ptr.h" | 9 #include "base/memory/scoped_ptr.h" |
10 #include "base/stl_util.h" | 10 #include "base/stl_util.h" |
11 #include "base/strings/string_number_conversions.h" | 11 #include "base/strings/string_number_conversions.h" |
12 #include "content/browser/speech/audio_buffer.h" | 12 #include "content/browser/speech/audio_buffer.h" |
13 #include "third_party/flac/include/FLAC/stream_encoder.h" | 13 #include "third_party/flac/include/FLAC/stream_encoder.h" |
14 #include "third_party/speex/include/speex/speex.h" | 14 #include "third_party/speex/include/speex/speex.h" |
15 | 15 |
16 namespace content { | 16 namespace content { |
17 namespace { | 17 namespace { |
18 | 18 |
19 //-------------------------------- FLACEncoder --------------------------------- | 19 //-------------------------------- FLACEncoder --------------------------------- |
20 | 20 |
21 const char* const kContentTypeFLAC = "audio/x-flac; rate="; | 21 const char* const kContentTypeFLAC = "audio/x-flac; rate="; |
22 const int kFLACCompressionLevel = 0; // 0 for speed | 22 const int kFLACCompressionLevel = 0; // 0 for speed |
23 | 23 |
24 class FLACEncoder : public AudioEncoder { | 24 class FLACEncoder : public AudioEncoder { |
25 public: | 25 public: |
26 FLACEncoder(int sampling_rate, int bits_per_sample); | 26 FLACEncoder(int sampling_rate, int bits_per_sample); |
27 virtual ~FLACEncoder(); | 27 virtual ~FLACEncoder(); |
28 virtual void Encode(const AudioChunk& raw_audio) OVERRIDE; | 28 virtual void Encode(const AudioChunk& raw_audio) override; |
29 virtual void Flush() OVERRIDE; | 29 virtual void Flush() override; |
30 | 30 |
31 private: | 31 private: |
32 static FLAC__StreamEncoderWriteStatus WriteCallback( | 32 static FLAC__StreamEncoderWriteStatus WriteCallback( |
33 const FLAC__StreamEncoder* encoder, | 33 const FLAC__StreamEncoder* encoder, |
34 const FLAC__byte buffer[], | 34 const FLAC__byte buffer[], |
35 size_t bytes, | 35 size_t bytes, |
36 unsigned samples, | 36 unsigned samples, |
37 unsigned current_frame, | 37 unsigned current_frame, |
38 void* client_data); | 38 void* client_data); |
39 | 39 |
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107 const int kMaxSpeexFrameLength = 110; // (44kbps rate sampled at 32kHz). | 107 const int kMaxSpeexFrameLength = 110; // (44kbps rate sampled at 32kHz). |
108 | 108 |
109 // Since the frame length gets written out as a byte in the encoded packet, | 109 // Since the frame length gets written out as a byte in the encoded packet, |
110 // make sure it is within the byte range. | 110 // make sure it is within the byte range. |
111 COMPILE_ASSERT(kMaxSpeexFrameLength <= 0xFF, invalidLength); | 111 COMPILE_ASSERT(kMaxSpeexFrameLength <= 0xFF, invalidLength); |
112 | 112 |
113 class SpeexEncoder : public AudioEncoder { | 113 class SpeexEncoder : public AudioEncoder { |
114 public: | 114 public: |
115 explicit SpeexEncoder(int sampling_rate, int bits_per_sample); | 115 explicit SpeexEncoder(int sampling_rate, int bits_per_sample); |
116 virtual ~SpeexEncoder(); | 116 virtual ~SpeexEncoder(); |
117 virtual void Encode(const AudioChunk& raw_audio) OVERRIDE; | 117 virtual void Encode(const AudioChunk& raw_audio) override; |
118 virtual void Flush() OVERRIDE {} | 118 virtual void Flush() override {} |
119 | 119 |
120 private: | 120 private: |
121 void* encoder_state_; | 121 void* encoder_state_; |
122 SpeexBits bits_; | 122 SpeexBits bits_; |
123 int samples_per_frame_; | 123 int samples_per_frame_; |
124 char encoded_frame_data_[kMaxSpeexFrameLength + 1]; // +1 for the frame size. | 124 char encoded_frame_data_[kMaxSpeexFrameLength + 1]; // +1 for the frame size. |
125 DISALLOW_COPY_AND_ASSIGN(SpeexEncoder); | 125 DISALLOW_COPY_AND_ASSIGN(SpeexEncoder); |
126 }; | 126 }; |
127 | 127 |
128 SpeexEncoder::SpeexEncoder(int sampling_rate, int bits_per_sample) | 128 SpeexEncoder::SpeexEncoder(int sampling_rate, int bits_per_sample) |
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185 } | 185 } |
186 | 186 |
187 AudioEncoder::~AudioEncoder() { | 187 AudioEncoder::~AudioEncoder() { |
188 } | 188 } |
189 | 189 |
190 scoped_refptr<AudioChunk> AudioEncoder::GetEncodedDataAndClear() { | 190 scoped_refptr<AudioChunk> AudioEncoder::GetEncodedDataAndClear() { |
191 return encoded_audio_buffer_.DequeueAll(); | 191 return encoded_audio_buffer_.DequeueAll(); |
192 } | 192 } |
193 | 193 |
194 } // namespace content | 194 } // namespace content |
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