1 /* 2 * Copyright (c) 2013 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_COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_ 12 #define WEBRTC_COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_ 13 14 #include "webrtc/system_wrappers/interface/scoped_ptr.h" 15 #include "webrtc/typedefs.h" 16 17 namespace webrtc { 18 19 class PushSincResampler; 20 21 // Wraps PushSincResampler to provide stereo support. 22 // TODO(ajm): add support for an arbitrary number of channels. 23 template <typename T> 24 class PushResampler { 25 public: 26 PushResampler(); 27 virtual ~PushResampler(); 28 29 // Must be called whenever the parameters change. Free to be called at any 30 // time as it is a no-op if parameters have not changed since the last call. 31 int InitializeIfNeeded(int src_sample_rate_hz, int dst_sample_rate_hz, 32 int num_channels); 33 34 // Returns the total number of samples provided in destination (e.g. 32 kHz, 35 // 2 channel audio gives 640 samples). 36 int Resample(const T* src, int src_length, T* dst, int dst_capacity); 37 38 private: 39 scoped_ptr<PushSincResampler> sinc_resampler_; 40 scoped_ptr<PushSincResampler> sinc_resampler_right_; 41 int src_sample_rate_hz_; 42 int dst_sample_rate_hz_; 43 int num_channels_; 44 scoped_ptr<T[]> src_left_; 45 scoped_ptr<T[]> src_right_; 46 scoped_ptr<T[]> dst_left_; 47 scoped_ptr<T[]> dst_right_; 48 }; 49 50 } // namespace webrtc 51 52 #endif // WEBRTC_COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_ 53
