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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 #ifndef CONTENT_BROWSER_SPEECH_AUDIO_BUFFER_H_ | 5 #ifndef CONTENT_BROWSER_SPEECH_AUDIO_BUFFER_H_ |
| 6 #define CONTENT_BROWSER_SPEECH_AUDIO_BUFFER_H_ | 6 #define CONTENT_BROWSER_SPEECH_AUDIO_BUFFER_H_ |
| 7 | 7 |
| 8 #include <stddef.h> |
| 9 #include <stdint.h> |
| 10 |
| 8 #include <deque> | 11 #include <deque> |
| 9 #include <string> | 12 #include <string> |
| 10 | 13 |
| 11 #include "base/basictypes.h" | 14 #include "base/macros.h" |
| 12 #include "base/memory/ref_counted.h" | 15 #include "base/memory/ref_counted.h" |
| 13 #include "content/common/content_export.h" | 16 #include "content/common/content_export.h" |
| 14 | 17 |
| 15 namespace content { | 18 namespace content { |
| 16 | 19 |
| 17 // Models a chunk derived from an AudioBuffer. | 20 // Models a chunk derived from an AudioBuffer. |
| 18 class CONTENT_EXPORT AudioChunk : | 21 class CONTENT_EXPORT AudioChunk : |
| 19 public base::RefCountedThreadSafe<AudioChunk> { | 22 public base::RefCountedThreadSafe<AudioChunk> { |
| 20 public: | 23 public: |
| 21 explicit AudioChunk(int bytes_per_sample); | 24 explicit AudioChunk(int bytes_per_sample); |
| 22 // Creates a chunk of |length| bytes, initialized to zeros. | 25 // Creates a chunk of |length| bytes, initialized to zeros. |
| 23 AudioChunk(size_t length, int bytes_per_sample); | 26 AudioChunk(size_t length, int bytes_per_sample); |
| 24 AudioChunk(const uint8* data, size_t length, int bytes_per_sample); | 27 AudioChunk(const uint8_t* data, size_t length, int bytes_per_sample); |
| 25 | 28 |
| 26 bool IsEmpty() const; | 29 bool IsEmpty() const; |
| 27 int bytes_per_sample() const { return bytes_per_sample_; } | 30 int bytes_per_sample() const { return bytes_per_sample_; } |
| 28 size_t NumSamples() const; | 31 size_t NumSamples() const; |
| 29 const std::string& AsString() const; | 32 const std::string& AsString() const; |
| 30 int16 GetSample16(size_t index) const; | 33 int16_t GetSample16(size_t index) const; |
| 31 const int16* SamplesData16() const; | 34 const int16_t* SamplesData16() const; |
| 32 uint8* writable_data() { return reinterpret_cast<uint8*>(&data_string_[0]); } | 35 uint8_t* writable_data() { |
| 36 return reinterpret_cast<uint8_t*>(&data_string_[0]); |
| 37 } |
| 33 | 38 |
| 34 private: | 39 private: |
| 35 friend class base::RefCountedThreadSafe<AudioChunk>; | 40 friend class base::RefCountedThreadSafe<AudioChunk>; |
| 36 ~AudioChunk() {} | 41 ~AudioChunk() {} |
| 37 | 42 |
| 38 std::string data_string_; | 43 std::string data_string_; |
| 39 const int bytes_per_sample_; | 44 const int bytes_per_sample_; |
| 40 | 45 |
| 41 DISALLOW_COPY_AND_ASSIGN(AudioChunk); | 46 DISALLOW_COPY_AND_ASSIGN(AudioChunk); |
| 42 }; | 47 }; |
| 43 | 48 |
| 44 // Models an audio buffer. The current implementation relies on on-demand | 49 // Models an audio buffer. The current implementation relies on on-demand |
| 45 // allocations of AudioChunk(s) (which uses a string as storage). | 50 // allocations of AudioChunk(s) (which uses a string as storage). |
| 46 class AudioBuffer { | 51 class AudioBuffer { |
| 47 public: | 52 public: |
| 48 explicit AudioBuffer(int bytes_per_sample); | 53 explicit AudioBuffer(int bytes_per_sample); |
| 49 ~AudioBuffer(); | 54 ~AudioBuffer(); |
| 50 | 55 |
| 51 // Enqueues a copy of |length| bytes of |data| buffer. | 56 // Enqueues a copy of |length| bytes of |data| buffer. |
| 52 void Enqueue(const uint8* data, size_t length); | 57 void Enqueue(const uint8_t* data, size_t length); |
| 53 | 58 |
| 54 // Dequeues, in FIFO order, a single chunk respecting the length of the | 59 // Dequeues, in FIFO order, a single chunk respecting the length of the |
| 55 // corresponding Enqueue call (in a nutshell: multiple Enqueue calls followed | 60 // corresponding Enqueue call (in a nutshell: multiple Enqueue calls followed |
| 56 // by DequeueSingleChunk calls will return the individual chunks without | 61 // by DequeueSingleChunk calls will return the individual chunks without |
| 57 // merging them). | 62 // merging them). |
| 58 scoped_refptr<AudioChunk> DequeueSingleChunk(); | 63 scoped_refptr<AudioChunk> DequeueSingleChunk(); |
| 59 | 64 |
| 60 // Dequeues all previously enqueued chunks, merging them in a single chunk. | 65 // Dequeues all previously enqueued chunks, merging them in a single chunk. |
| 61 scoped_refptr<AudioChunk> DequeueAll(); | 66 scoped_refptr<AudioChunk> DequeueAll(); |
| 62 | 67 |
| 63 // Removes and frees all the enqueued chunks. | 68 // Removes and frees all the enqueued chunks. |
| 64 void Clear(); | 69 void Clear(); |
| 65 | 70 |
| 66 // Checks whether the buffer is empty. | 71 // Checks whether the buffer is empty. |
| 67 bool IsEmpty() const; | 72 bool IsEmpty() const; |
| 68 | 73 |
| 69 private: | 74 private: |
| 70 typedef std::deque<scoped_refptr<AudioChunk> > ChunksContainer; | 75 typedef std::deque<scoped_refptr<AudioChunk> > ChunksContainer; |
| 71 ChunksContainer chunks_; | 76 ChunksContainer chunks_; |
| 72 const int bytes_per_sample_; | 77 const int bytes_per_sample_; |
| 73 | 78 |
| 74 DISALLOW_COPY_AND_ASSIGN(AudioBuffer); | 79 DISALLOW_COPY_AND_ASSIGN(AudioBuffer); |
| 75 }; | 80 }; |
| 76 | 81 |
| 77 } // namespace content | 82 } // namespace content |
| 78 | 83 |
| 79 #endif // CONTENT_BROWSER_SPEECH_AUDIO_BUFFER_H_ | 84 #endif // CONTENT_BROWSER_SPEECH_AUDIO_BUFFER_H_ |
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