diff options
Diffstat (limited to 'media/webrtc/trunk/webrtc/modules/utility/interface/audio_frame_operations.h')
-rw-r--r-- | media/webrtc/trunk/webrtc/modules/utility/interface/audio_frame_operations.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/media/webrtc/trunk/webrtc/modules/utility/interface/audio_frame_operations.h b/media/webrtc/trunk/webrtc/modules/utility/interface/audio_frame_operations.h new file mode 100644 index 000000000..f439dacbc --- /dev/null +++ b/media/webrtc/trunk/webrtc/modules/utility/interface/audio_frame_operations.h @@ -0,0 +1,58 @@ +/* + * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef WEBRTC_VOICE_ENGINE_AUDIO_FRAME_OPERATIONS_H_ +#define WEBRTC_VOICE_ENGINE_AUDIO_FRAME_OPERATIONS_H_ + +#include "webrtc/typedefs.h" + +namespace webrtc { + +class AudioFrame; + +// TODO(andrew): consolidate this with utility.h and audio_frame_manipulator.h. +// Change reference parameters to pointers. Consider using a namespace rather +// than a class. +class AudioFrameOperations { + public: + // Upmixes mono |src_audio| to stereo |dst_audio|. This is an out-of-place + // operation, meaning src_audio and dst_audio must point to different + // buffers. It is the caller's responsibility to ensure that |dst_audio| is + // sufficiently large. + static void MonoToStereo(const int16_t* src_audio, int samples_per_channel, + int16_t* dst_audio); + // |frame.num_channels_| will be updated. This version checks for sufficient + // buffer size and that |num_channels_| is mono. + static int MonoToStereo(AudioFrame* frame); + + // Downmixes stereo |src_audio| to mono |dst_audio|. This is an in-place + // operation, meaning |src_audio| and |dst_audio| may point to the same + // buffer. + static void StereoToMono(const int16_t* src_audio, int samples_per_channel, + int16_t* dst_audio); + // |frame.num_channels_| will be updated. This version checks that + // |num_channels_| is stereo. + static int StereoToMono(AudioFrame* frame); + + // Swap the left and right channels of |frame|. Fails silently if |frame| is + // not stereo. + static void SwapStereoChannels(AudioFrame* frame); + + // Zeros out the audio and sets |frame.energy| to zero. + static void Mute(AudioFrame& frame); + + static int Scale(float left, float right, AudioFrame& frame); + + static int ScaleWithSat(float scale, AudioFrame& frame); +}; + +} // namespace webrtc + +#endif // #ifndef WEBRTC_VOICE_ENGINE_AUDIO_FRAME_OPERATIONS_H_ |