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| 1 /* | |
| 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #ifndef WEBRTC_VOICE_ENGINE_AUDIO_FRAME_OPERATIONS_H_ | |
| 12 #define WEBRTC_VOICE_ENGINE_AUDIO_FRAME_OPERATIONS_H_ | |
| 13 | |
| 14 #include "webrtc/typedefs.h" | |
| 15 | |
| 16 namespace webrtc { | |
| 17 | |
| 18 class AudioFrame; | |
| 19 | |
| 20 // TODO(andrew): consolidate this with utility.h and audio_frame_manipulator.h. | |
| 21 // Change reference parameters to pointers. Consider using a namespace rather | |
| 22 // than a class. | |
| 23 class AudioFrameOperations { | |
| 24 public: | |
| 25 // Upmixes mono |src_audio| to stereo |dst_audio|. This is an out-of-place | |
| 26 // operation, meaning src_audio and dst_audio must point to different | |
| 27 // buffers. It is the caller's responsibility to ensure that |dst_audio| is | |
| 28 // sufficiently large. | |
| 29 static void MonoToStereo(const int16_t* src_audio, size_t samples_per_channel, | |
| 30 int16_t* dst_audio); | |
| 31 // |frame.num_channels_| will be updated. This version checks for sufficient | |
| 32 // buffer size and that |num_channels_| is mono. | |
| 33 static int MonoToStereo(AudioFrame* frame); | |
| 34 | |
| 35 // Downmixes stereo |src_audio| to mono |dst_audio|. This is an in-place | |
| 36 // operation, meaning |src_audio| and |dst_audio| may point to the same | |
| 37 // buffer. | |
| 38 static void StereoToMono(const int16_t* src_audio, size_t samples_per_channel, | |
| 39 int16_t* dst_audio); | |
| 40 // |frame.num_channels_| will be updated. This version checks that | |
| 41 // |num_channels_| is stereo. | |
| 42 static int StereoToMono(AudioFrame* frame); | |
| 43 | |
| 44 // Swap the left and right channels of |frame|. Fails silently if |frame| is | |
| 45 // not stereo. | |
| 46 static void SwapStereoChannels(AudioFrame* frame); | |
| 47 | |
| 48 // Zeros out the audio and sets |frame.energy| to zero. | |
| 49 static void Mute(AudioFrame& frame); | |
| 50 | |
| 51 static int Scale(float left, float right, AudioFrame& frame); | |
| 52 | |
| 53 static int ScaleWithSat(float scale, AudioFrame& frame); | |
| 54 }; | |
| 55 | |
| 56 } // namespace webrtc | |
| 57 | |
| 58 #endif // #ifndef WEBRTC_VOICE_ENGINE_AUDIO_FRAME_OPERATIONS_H_ | |
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Chromium Code Reviews
Issue 1417683006:
modules: more interface -> include renames (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master