| 1 | /* |
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| 2 | Copyright 2018 Google Inc. All Rights Reserved. |
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| 3 | |
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| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | you may not use this file except in compliance with the License. |
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| 6 | You may obtain a copy of the License at |
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| 7 | |
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| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | |
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| 10 | Unless required by applicable law or agreed to in writing, software |
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| 11 | distributed under the License is distributed on an "AS-IS" BASIS, |
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| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | See the License for the specific language governing permissions and |
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| 14 | limitations under the License. |
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| 15 | */ |
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| 16 | |
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| 17 | #include "dsp/sh_hrir_creator.h" |
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| 18 | |
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| 19 | #include "third_party/SADIE_hrtf_database/generated/hrtf_assets.h" |
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| 20 | #include "ambisonics/utils.h" |
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| 21 | #include "base/logging.h" |
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| 22 | #include "dsp/resampler.h" |
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| 23 | #include "utils/planar_interleaved_conversion.h" |
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| 24 | |
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| 25 | namespace vraudio { |
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| 26 | |
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| 27 | std::unique_ptr<AudioBuffer> CreateShHrirsFromWav(const Wav& wav, |
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| 28 | int target_sample_rate_hz, |
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| 29 | Resampler* resampler) { |
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| 30 | DCHECK(resampler); |
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| 31 | const size_t num_channels = wav.GetNumChannels(); |
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| 32 | CHECK(IsValidAmbisonicOrder(num_channels)); |
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| 33 | |
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| 34 | const size_t sh_hrir_length = wav.interleaved_samples().size() / num_channels; |
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| 35 | std::unique_ptr<AudioBuffer> sh_hrirs( |
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| 36 | new AudioBuffer(num_channels, sh_hrir_length)); |
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| 37 | FillAudioBuffer(interleaved_buffer: wav.interleaved_samples(), num_input_channels: num_channels, output: sh_hrirs.get()); |
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| 38 | |
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| 39 | const int wav_sample_rate_hz = wav.GetSampleRateHz(); |
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| 40 | CHECK_GT(wav_sample_rate_hz, 0); |
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| 41 | CHECK_GT(target_sample_rate_hz, 0); |
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| 42 | if (wav_sample_rate_hz != target_sample_rate_hz) { |
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| 43 | if (!Resampler::AreSampleRatesSupported(source: wav_sample_rate_hz, |
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| 44 | destination: target_sample_rate_hz)) { |
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| 45 | LOG(FATAL) << "Unsupported sampling rates for loading HRIRs: " |
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| 46 | << wav_sample_rate_hz << ", " << target_sample_rate_hz; |
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| 47 | } |
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| 48 | resampler->ResetState(); |
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| 49 | // Resample the SH HRIRs if necessary. |
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| 50 | resampler->SetRateAndNumChannels(source_frequency: wav_sample_rate_hz, destination_frequency: target_sample_rate_hz, |
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| 51 | num_channels); |
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| 52 | std::unique_ptr<AudioBuffer> resampled_sh_hrirs(new AudioBuffer( |
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| 53 | num_channels, resampler->GetNextOutputLength(input_length: sh_hrir_length))); |
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| 54 | resampler->Process(input: *sh_hrirs, output: resampled_sh_hrirs.get()); |
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| 55 | return resampled_sh_hrirs; |
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| 56 | } |
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| 57 | return sh_hrirs; |
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| 58 | } |
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| 59 | |
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| 60 | std::unique_ptr<AudioBuffer> CreateShHrirsFromAssets( |
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| 61 | const std::string& filename, int target_sample_rate_hz, |
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| 62 | Resampler* resampler) { |
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| 63 | // Read SH HRIR from asset store. |
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| 64 | sadie::HrtfAssets hrtf_assets; |
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| 65 | std::unique_ptr<std::string> sh_hrir_data = hrtf_assets.GetFile(filename); |
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| 66 | CHECK_NOTNULL(sh_hrir_data.get()); |
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| 67 | std::istringstream wav_data_stream(*sh_hrir_data); |
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| 68 | std::unique_ptr<const Wav> wav = Wav::CreateOrNull(binary_stream: &wav_data_stream); |
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| 69 | return CreateShHrirsFromWav(wav: *wav, target_sample_rate_hz, resampler); |
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| 70 | } |
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| 71 | |
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| 72 | } // namespace vraudio |
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| 73 | |
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