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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_buffer.h" | 5 #include "content/browser/speech/audio_buffer.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 | 8 |
9 namespace content { | 9 namespace content { |
10 | 10 |
11 AudioChunk::AudioChunk(int bytes_per_sample) | 11 AudioChunk::AudioChunk(int bytes_per_sample) |
12 : bytes_per_sample_(bytes_per_sample) { | 12 : bytes_per_sample_(bytes_per_sample) { |
13 } | 13 } |
14 | 14 |
15 AudioChunk::AudioChunk(size_t length, int bytes_per_sample) | 15 AudioChunk::AudioChunk(size_t length, int bytes_per_sample) |
16 : data_string_(length, '\0'), bytes_per_sample_(bytes_per_sample) { | 16 : data_string_(length, '\0'), bytes_per_sample_(bytes_per_sample) { |
17 DCHECK_EQ(length % bytes_per_sample, 0U); | 17 DCHECK_EQ(length % bytes_per_sample, 0U); |
18 } | 18 } |
19 | 19 |
20 AudioChunk::AudioChunk(const uint8* data, size_t length, int bytes_per_sample) | 20 AudioChunk::AudioChunk(const uint8_t* data, size_t length, int bytes_per_sample) |
21 : data_string_(reinterpret_cast<const char*>(data), length), | 21 : data_string_(reinterpret_cast<const char*>(data), length), |
22 bytes_per_sample_(bytes_per_sample) { | 22 bytes_per_sample_(bytes_per_sample) { |
23 DCHECK_EQ(length % bytes_per_sample, 0U); | 23 DCHECK_EQ(length % bytes_per_sample, 0U); |
24 } | 24 } |
25 | 25 |
26 bool AudioChunk::IsEmpty() const { | 26 bool AudioChunk::IsEmpty() const { |
27 return data_string_.empty(); | 27 return data_string_.empty(); |
28 } | 28 } |
29 | 29 |
30 size_t AudioChunk::NumSamples() const { | 30 size_t AudioChunk::NumSamples() const { |
31 return data_string_.size() / bytes_per_sample_; | 31 return data_string_.size() / bytes_per_sample_; |
32 } | 32 } |
33 | 33 |
34 const std::string& AudioChunk::AsString() const { | 34 const std::string& AudioChunk::AsString() const { |
35 return data_string_; | 35 return data_string_; |
36 } | 36 } |
37 | 37 |
38 int16 AudioChunk::GetSample16(size_t index) const { | 38 int16_t AudioChunk::GetSample16(size_t index) const { |
39 DCHECK(index < (data_string_.size() / sizeof(int16))); | 39 DCHECK(index < (data_string_.size() / sizeof(int16_t))); |
40 return SamplesData16()[index]; | 40 return SamplesData16()[index]; |
41 } | 41 } |
42 | 42 |
43 const int16* AudioChunk::SamplesData16() const { | 43 const int16_t* AudioChunk::SamplesData16() const { |
44 return reinterpret_cast<const int16*>(data_string_.data()); | 44 return reinterpret_cast<const int16_t*>(data_string_.data()); |
45 } | 45 } |
46 | 46 |
47 AudioBuffer::AudioBuffer(int bytes_per_sample) | 47 AudioBuffer::AudioBuffer(int bytes_per_sample) |
48 : bytes_per_sample_(bytes_per_sample) { | 48 : bytes_per_sample_(bytes_per_sample) { |
49 DCHECK(bytes_per_sample == 1 || | 49 DCHECK(bytes_per_sample == 1 || |
50 bytes_per_sample == 2 || | 50 bytes_per_sample == 2 || |
51 bytes_per_sample == 4); | 51 bytes_per_sample == 4); |
52 } | 52 } |
53 | 53 |
54 AudioBuffer::~AudioBuffer() { | 54 AudioBuffer::~AudioBuffer() { |
55 Clear(); | 55 Clear(); |
56 } | 56 } |
57 | 57 |
58 void AudioBuffer::Enqueue(const uint8* data, size_t length) { | 58 void AudioBuffer::Enqueue(const uint8_t* data, size_t length) { |
59 chunks_.push_back(new AudioChunk(data, length, bytes_per_sample_)); | 59 chunks_.push_back(new AudioChunk(data, length, bytes_per_sample_)); |
60 } | 60 } |
61 | 61 |
62 scoped_refptr<AudioChunk> AudioBuffer::DequeueSingleChunk() { | 62 scoped_refptr<AudioChunk> AudioBuffer::DequeueSingleChunk() { |
63 DCHECK(!chunks_.empty()); | 63 DCHECK(!chunks_.empty()); |
64 scoped_refptr<AudioChunk> chunk(chunks_.front()); | 64 scoped_refptr<AudioChunk> chunk(chunks_.front()); |
65 chunks_.pop_front(); | 65 chunks_.pop_front(); |
66 return chunk; | 66 return chunk; |
67 } | 67 } |
68 | 68 |
69 scoped_refptr<AudioChunk> AudioBuffer::DequeueAll() { | 69 scoped_refptr<AudioChunk> AudioBuffer::DequeueAll() { |
70 size_t resulting_length = 0; | 70 size_t resulting_length = 0; |
71 ChunksContainer::const_iterator it; | 71 ChunksContainer::const_iterator it; |
72 // In order to improve performance, calulate in advance the total length | 72 // In order to improve performance, calulate in advance the total length |
73 // and then copy the chunks. | 73 // and then copy the chunks. |
74 for (it = chunks_.begin(); it != chunks_.end(); ++it) { | 74 for (it = chunks_.begin(); it != chunks_.end(); ++it) { |
75 resulting_length += (*it)->AsString().length(); | 75 resulting_length += (*it)->AsString().length(); |
76 } | 76 } |
77 scoped_refptr<AudioChunk> chunk( | 77 scoped_refptr<AudioChunk> chunk( |
78 new AudioChunk(resulting_length, bytes_per_sample_)); | 78 new AudioChunk(resulting_length, bytes_per_sample_)); |
79 uint8* dest = chunk->writable_data(); | 79 uint8_t* dest = chunk->writable_data(); |
80 for (it = chunks_.begin(); it != chunks_.end(); ++it) { | 80 for (it = chunks_.begin(); it != chunks_.end(); ++it) { |
81 memcpy(dest, (*it)->AsString().data(), (*it)->AsString().length()); | 81 memcpy(dest, (*it)->AsString().data(), (*it)->AsString().length()); |
82 dest += (*it)->AsString().length(); | 82 dest += (*it)->AsString().length(); |
83 } | 83 } |
84 Clear(); | 84 Clear(); |
85 return chunk; | 85 return chunk; |
86 } | 86 } |
87 | 87 |
88 void AudioBuffer::Clear() { | 88 void AudioBuffer::Clear() { |
89 chunks_.clear(); | 89 chunks_.clear(); |
90 } | 90 } |
91 | 91 |
92 bool AudioBuffer::IsEmpty() const { | 92 bool AudioBuffer::IsEmpty() const { |
93 return chunks_.empty(); | 93 return chunks_.empty(); |
94 } | 94 } |
95 | 95 |
96 } // namespace content | 96 } // namespace content |
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