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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 <memory> |
11 #include <vector> | 11 #include <vector> |
12 | 12 |
13 #include "base/macros.h" | 13 #include "base/macros.h" |
14 #include "base/memory/aligned_memory.h" | 14 #include "base/memory/aligned_memory.h" |
15 #include "media/base/media_export.h" | 15 #include "media/base/media_export.h" |
16 | 16 |
17 namespace media { | 17 namespace media { |
18 class AudioParameters; | 18 class AudioParameters; |
19 | 19 |
20 // Represents a sequence of audio frames containing frames() audio samples for | 20 // Represents a sequence of audio frames containing frames() audio samples for |
21 // each of channels() channels. The data is stored as a set of contiguous | 21 // each of channels() channels. The data is stored as a set of contiguous |
22 // float arrays with one array per channel. The memory for the arrays is either | 22 // float arrays with one array per channel. The memory for the arrays is either |
23 // allocated and owned by the AudioBus or it is provided to one of the factory | 23 // allocated and owned by the AudioBus or it is provided to one of the factory |
24 // methods. AudioBus guarantees that it allocates memory such that float array | 24 // methods. AudioBus guarantees that it allocates memory such that float array |
25 // for each channel is aligned by AudioBus::kChannelAlignment bytes and it | 25 // for each channel is aligned by AudioBus::kChannelAlignment bytes and it |
26 // requires the same for memory passed to its Wrap...() factory methods. | 26 // requires the same for memory passed to its Wrap...() factory methods. |
27 // TODO(chfremer): There are currently no unit tests involving CreateWrapper and | |
28 // SetChannelData, so we need to add them. | |
29 class MEDIA_EXPORT AudioBus { | 27 class MEDIA_EXPORT AudioBus { |
30 public: | 28 public: |
31 // Guaranteed alignment of each channel's data; use 16-byte alignment for easy | 29 // Guaranteed alignment of each channel's data; use 16-byte alignment for easy |
32 // SSE optimizations. | 30 // SSE optimizations. |
33 enum { kChannelAlignment = 16 }; | 31 enum { kChannelAlignment = 16 }; |
34 | 32 |
35 // Creates a new AudioBus and allocates |channels| of length |frames|. Uses | 33 // Creates a new AudioBus and allocates |channels| of length |frames|. Uses |
36 // channels() and frames_per_buffer() from AudioParameters if given. | 34 // channels() and frames_per_buffer() from AudioParameters if given. |
37 static std::unique_ptr<AudioBus> Create(int channels, int frames); | 35 static std::unique_ptr<AudioBus> Create(int channels, int frames); |
38 static std::unique_ptr<AudioBus> Create(const AudioParameters& params); | 36 static std::unique_ptr<AudioBus> Create(const AudioParameters& params); |
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301 float sourceSampleValue = channel_data[source_frame_index]; | 299 float sourceSampleValue = channel_data[source_frame_index]; |
302 dest_buffer[write_pos_in_dest] = | 300 dest_buffer[write_pos_in_dest] = |
303 TargetSampleTypeTraits::FromFloat(sourceSampleValue); | 301 TargetSampleTypeTraits::FromFloat(sourceSampleValue); |
304 } | 302 } |
305 } | 303 } |
306 } | 304 } |
307 | 305 |
308 } // namespace media | 306 } // namespace media |
309 | 307 |
310 #endif // MEDIA_BASE_AUDIO_BUS_H_ | 308 #endif // MEDIA_BASE_AUDIO_BUS_H_ |
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