| /* |
| * Copyright (c) 2014 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. |
| */ |
| |
| #include "webrtc/modules/audio_processing/splitting_filter.h" |
| |
| #include "webrtc/base/checks.h" |
| #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" |
| #include "webrtc/common_audio/channel_buffer.h" |
| |
| namespace webrtc { |
| |
| SplittingFilter::SplittingFilter(size_t num_channels, |
| size_t num_bands, |
| size_t num_frames) |
| : num_bands_(num_bands) { |
| RTC_CHECK(num_bands_ == 2 || num_bands_ == 3); |
| if (num_bands_ == 2) { |
| two_bands_states_.resize(num_channels); |
| } else if (num_bands_ == 3) { |
| for (size_t i = 0; i < num_channels; ++i) { |
| three_band_filter_banks_.push_back(std::unique_ptr<ThreeBandFilterBank>( |
| new ThreeBandFilterBank(num_frames))); |
| } |
| } |
| } |
| |
| SplittingFilter::~SplittingFilter() = default; |
| |
| void SplittingFilter::Analysis(const IFChannelBuffer* data, |
| IFChannelBuffer* bands) { |
| RTC_DCHECK_EQ(num_bands_, bands->num_bands()); |
| RTC_DCHECK_EQ(data->num_channels(), bands->num_channels()); |
| RTC_DCHECK_EQ(data->num_frames(), |
| bands->num_frames_per_band() * bands->num_bands()); |
| if (bands->num_bands() == 2) { |
| TwoBandsAnalysis(data, bands); |
| } else if (bands->num_bands() == 3) { |
| ThreeBandsAnalysis(data, bands); |
| } |
| } |
| |
| void SplittingFilter::Synthesis(const IFChannelBuffer* bands, |
| IFChannelBuffer* data) { |
| RTC_DCHECK_EQ(num_bands_, bands->num_bands()); |
| RTC_DCHECK_EQ(data->num_channels(), bands->num_channels()); |
| RTC_DCHECK_EQ(data->num_frames(), |
| bands->num_frames_per_band() * bands->num_bands()); |
| if (bands->num_bands() == 2) { |
| TwoBandsSynthesis(bands, data); |
| } else if (bands->num_bands() == 3) { |
| ThreeBandsSynthesis(bands, data); |
| } |
| } |
| |
| void SplittingFilter::TwoBandsAnalysis(const IFChannelBuffer* data, |
| IFChannelBuffer* bands) { |
| RTC_DCHECK_EQ(two_bands_states_.size(), data->num_channels()); |
| for (size_t i = 0; i < two_bands_states_.size(); ++i) { |
| WebRtcSpl_AnalysisQMF(data->ibuf_const()->channels()[i], |
| data->num_frames(), |
| bands->ibuf()->channels(0)[i], |
| bands->ibuf()->channels(1)[i], |
| two_bands_states_[i].analysis_state1, |
| two_bands_states_[i].analysis_state2); |
| } |
| } |
| |
| void SplittingFilter::TwoBandsSynthesis(const IFChannelBuffer* bands, |
| IFChannelBuffer* data) { |
| RTC_DCHECK_LE(data->num_channels(), two_bands_states_.size()); |
| for (size_t i = 0; i < data->num_channels(); ++i) { |
| WebRtcSpl_SynthesisQMF(bands->ibuf_const()->channels(0)[i], |
| bands->ibuf_const()->channels(1)[i], |
| bands->num_frames_per_band(), |
| data->ibuf()->channels()[i], |
| two_bands_states_[i].synthesis_state1, |
| two_bands_states_[i].synthesis_state2); |
| } |
| } |
| |
| void SplittingFilter::ThreeBandsAnalysis(const IFChannelBuffer* data, |
| IFChannelBuffer* bands) { |
| RTC_DCHECK_EQ(three_band_filter_banks_.size(), data->num_channels()); |
| for (size_t i = 0; i < three_band_filter_banks_.size(); ++i) { |
| three_band_filter_banks_[i]->Analysis(data->fbuf_const()->channels()[i], |
| data->num_frames(), |
| bands->fbuf()->bands(i)); |
| } |
| } |
| |
| void SplittingFilter::ThreeBandsSynthesis(const IFChannelBuffer* bands, |
| IFChannelBuffer* data) { |
| RTC_DCHECK_LE(data->num_channels(), three_band_filter_banks_.size()); |
| for (size_t i = 0; i < data->num_channels(); ++i) { |
| three_band_filter_banks_[i]->Synthesis(bands->fbuf_const()->bands(i), |
| bands->num_frames_per_band(), |
| data->fbuf()->channels()[i]); |
| } |
| } |
| |
| } // namespace webrtc |