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1f3679884c
Start introducing ArrayView to AudioFrame and code that flows down from there. In this first step: * Add `data_view()` that returns a read-only ArrayView for the audio buffer. When AudioFrame is not initialized however, data_view() will return a nullptr whereas the current data() method never returns nullptr. * Add `mutable_data()` that requires two arguments for properly setting the samples per channel and number of channels that's required for accurately reserving the returned mutable ArrayView. A notable behavior change is that if the requested number of channels is larger than supported or the calculated buffer size is too large, the function will trigger a check. * Add TODOs for following work. Bug: chromium:335805780 Change-Id: I2937de800422589ebe6a3840b3caadf3d9ff8b00 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/347982 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42202}
62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
/*
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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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#include "api/array_view.h"
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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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// Note: This implementation assumes 10ms buffer sizes throughout.
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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(rtc::ArrayView<const T> src, rtc::ArrayView<T> dst);
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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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