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60 lines
2.0 KiB
60 lines
2.0 KiB
7 months ago
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/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_
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#define COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_
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#include <memory>
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#include <vector>
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namespace webrtc {
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class PushSincResampler;
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// Wraps PushSincResampler to provide stereo support.
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// TODO(ajm): add support for an arbitrary number of channels.
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template <typename T>
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class PushResampler {
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public:
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PushResampler();
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virtual ~PushResampler();
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// Must be called whenever the parameters change. Free to be called at any
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// time as it is a no-op if parameters have not changed since the last call.
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int InitializeIfNeeded(int src_sample_rate_hz,
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int dst_sample_rate_hz,
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size_t num_channels);
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// Returns the total number of samples provided in destination (e.g. 32 kHz,
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// 2 channel audio gives 640 samples).
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int Resample(const T* src, size_t src_length, T* dst, size_t dst_capacity);
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private:
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int src_sample_rate_hz_;
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int dst_sample_rate_hz_;
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size_t num_channels_;
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// Vector that is needed to provide the proper inputs and outputs to the
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// interleave/de-interleave methods used in Resample. This needs to be
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// heap-allocated on the state to support an arbitrary number of channels
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// without doing run-time heap-allocations in the Resample method.
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std::vector<T*> channel_data_array_;
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struct ChannelResampler {
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std::unique_ptr<PushSincResampler> resampler;
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std::vector<T> source;
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std::vector<T> destination;
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};
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std::vector<ChannelResampler> channel_resamplers_;
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};
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} // namespace webrtc
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#endif // COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_
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