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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 MEDIA_BASE_AUDIO_BUS_H_ | 5 #ifndef MEDIA_BASE_AUDIO_BUS_H_ |
6 #define MEDIA_BASE_AUDIO_BUS_H_ | 6 #define MEDIA_BASE_AUDIO_BUS_H_ |
7 | 7 |
8 #include <stdint.h> | 8 #include <stdint.h> |
9 | 9 |
| 10 #include <memory> |
10 #include <vector> | 11 #include <vector> |
11 | 12 |
12 #include "base/macros.h" | 13 #include "base/macros.h" |
13 #include "base/memory/aligned_memory.h" | 14 #include "base/memory/aligned_memory.h" |
14 #include "base/memory/ref_counted.h" | 15 #include "base/memory/ref_counted.h" |
15 #include "base/memory/scoped_ptr.h" | |
16 #include "media/base/media_export.h" | 16 #include "media/base/media_export.h" |
17 | 17 |
18 namespace media { | 18 namespace media { |
19 class AudioParameters; | 19 class AudioParameters; |
20 | 20 |
21 // Scoped container for "busing" audio channel data around. Each channel is | 21 // Scoped container for "busing" audio channel data around. Each channel is |
22 // stored in planar format and guaranteed to be aligned by kChannelAlignment. | 22 // stored in planar format and guaranteed to be aligned by kChannelAlignment. |
23 // AudioBus objects can be created normally or via wrapping. Normally, AudioBus | 23 // AudioBus objects can be created normally or via wrapping. Normally, AudioBus |
24 // will dice up a contiguous memory block for channel data. When wrapped, | 24 // will dice up a contiguous memory block for channel data. When wrapped, |
25 // AudioBus instead routes requests for channel data to the wrapped object. | 25 // AudioBus instead routes requests for channel data to the wrapped object. |
26 class MEDIA_EXPORT AudioBus { | 26 class MEDIA_EXPORT AudioBus { |
27 public: | 27 public: |
28 // Guaranteed alignment of each channel's data; use 16-byte alignment for easy | 28 // Guaranteed alignment of each channel's data; use 16-byte alignment for easy |
29 // SSE optimizations. | 29 // SSE optimizations. |
30 enum { kChannelAlignment = 16 }; | 30 enum { kChannelAlignment = 16 }; |
31 | 31 |
32 // Creates a new AudioBus and allocates |channels| of length |frames|. Uses | 32 // Creates a new AudioBus and allocates |channels| of length |frames|. Uses |
33 // channels() and frames_per_buffer() from AudioParameters if given. | 33 // channels() and frames_per_buffer() from AudioParameters if given. |
34 static scoped_ptr<AudioBus> Create(int channels, int frames); | 34 static std::unique_ptr<AudioBus> Create(int channels, int frames); |
35 static scoped_ptr<AudioBus> Create(const AudioParameters& params); | 35 static std::unique_ptr<AudioBus> Create(const AudioParameters& params); |
36 | 36 |
37 // Creates a new AudioBus with the given number of channels, but zero length. | 37 // Creates a new AudioBus with the given number of channels, but zero length. |
38 // It's expected to be used with SetChannelData() and set_frames() to | 38 // It's expected to be used with SetChannelData() and set_frames() to |
39 // wrap externally allocated memory. | 39 // wrap externally allocated memory. |
40 static scoped_ptr<AudioBus> CreateWrapper(int channels); | 40 static std::unique_ptr<AudioBus> CreateWrapper(int channels); |
41 | 41 |
42 // Creates a new AudioBus from an existing channel vector. Does not transfer | 42 // Creates a new AudioBus from an existing channel vector. Does not transfer |
43 // ownership of |channel_data| to AudioBus; i.e., |channel_data| must outlive | 43 // ownership of |channel_data| to AudioBus; i.e., |channel_data| must outlive |
44 // the returned AudioBus. Each channel must be aligned by kChannelAlignment. | 44 // the returned AudioBus. Each channel must be aligned by kChannelAlignment. |
45 static scoped_ptr<AudioBus> WrapVector( | 45 static std::unique_ptr<AudioBus> WrapVector( |
46 int frames, const std::vector<float*>& channel_data); | 46 int frames, |
| 47 const std::vector<float*>& channel_data); |
47 | 48 |
48 // Creates a new AudioBus by wrapping an existing block of memory. Block must | 49 // Creates a new AudioBus by wrapping an existing block of memory. Block must |
49 // be at least CalculateMemorySize() bytes in size. |data| must outlive the | 50 // be at least CalculateMemorySize() bytes in size. |data| must outlive the |
50 // returned AudioBus. |data| must be aligned by kChannelAlignment. | 51 // returned AudioBus. |data| must be aligned by kChannelAlignment. |
51 static scoped_ptr<AudioBus> WrapMemory(int channels, int frames, void* data); | 52 static std::unique_ptr<AudioBus> WrapMemory(int channels, |
52 static scoped_ptr<AudioBus> WrapMemory(const AudioParameters& params, | 53 int frames, |
53 void* data); | 54 void* data); |
| 55 static std::unique_ptr<AudioBus> WrapMemory(const AudioParameters& params, |
| 56 void* data); |
54 static int CalculateMemorySize(const AudioParameters& params); | 57 static int CalculateMemorySize(const AudioParameters& params); |
55 | 58 |
56 // Calculates the required size for an AudioBus given the number of channels | 59 // Calculates the required size for an AudioBus given the number of channels |
57 // and frames. | 60 // and frames. |
58 static int CalculateMemorySize(int channels, int frames); | 61 static int CalculateMemorySize(int channels, int frames); |
59 | 62 |
60 // Helper methods for converting an AudioBus from and to interleaved integer | 63 // Helper methods for converting an AudioBus from and to interleaved integer |
61 // data. Expects interleaving to be [ch0, ch1, ..., chN, ch0, ch1, ...] with | 64 // data. Expects interleaving to be [ch0, ch1, ..., chN, ch0, ch1, ...] with |
62 // |bytes_per_sample| per value. Values are scaled and bias corrected during | 65 // |bytes_per_sample| per value. Values are scaled and bias corrected during |
63 // conversion. ToInterleaved() will also clip values to format range. | 66 // conversion. ToInterleaved() will also clip values to format range. |
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123 AudioBus(int channels, int frames, float* data); | 126 AudioBus(int channels, int frames, float* data); |
124 AudioBus(int frames, const std::vector<float*>& channel_data); | 127 AudioBus(int frames, const std::vector<float*>& channel_data); |
125 explicit AudioBus(int channels); | 128 explicit AudioBus(int channels); |
126 | 129 |
127 private: | 130 private: |
128 // Helper method for building |channel_data_| from a block of memory. |data| | 131 // Helper method for building |channel_data_| from a block of memory. |data| |
129 // must be at least BlockSize() bytes in size. | 132 // must be at least BlockSize() bytes in size. |
130 void BuildChannelData(int channels, int aligned_frame, float* data); | 133 void BuildChannelData(int channels, int aligned_frame, float* data); |
131 | 134 |
132 // Contiguous block of channel memory. | 135 // Contiguous block of channel memory. |
133 scoped_ptr<float, base::AlignedFreeDeleter> data_; | 136 std::unique_ptr<float, base::AlignedFreeDeleter> data_; |
134 | 137 |
135 std::vector<float*> channel_data_; | 138 std::vector<float*> channel_data_; |
136 int frames_; | 139 int frames_; |
137 | 140 |
138 // Protect SetChannelData() and set_frames() for use by CreateWrapper(). | 141 // Protect SetChannelData() and set_frames() for use by CreateWrapper(). |
139 bool can_set_channel_data_; | 142 bool can_set_channel_data_; |
140 | 143 |
141 DISALLOW_COPY_AND_ASSIGN(AudioBus); | 144 DISALLOW_COPY_AND_ASSIGN(AudioBus); |
142 }; | 145 }; |
143 | 146 |
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155 | 158 |
156 AudioBusRefCounted(int channels, int frames); | 159 AudioBusRefCounted(int channels, int frames); |
157 ~AudioBusRefCounted() override; | 160 ~AudioBusRefCounted() override; |
158 | 161 |
159 DISALLOW_COPY_AND_ASSIGN(AudioBusRefCounted); | 162 DISALLOW_COPY_AND_ASSIGN(AudioBusRefCounted); |
160 }; | 163 }; |
161 | 164 |
162 } // namespace media | 165 } // namespace media |
163 | 166 |
164 #endif // MEDIA_BASE_AUDIO_BUS_H_ | 167 #endif // MEDIA_BASE_AUDIO_BUS_H_ |
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