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d00ce747c7
Bug: webrtc:12338 Change-Id: I02613d9fca45d00e2477f334b7a0416e7912e26b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227037 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34621}
99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
/*
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* Copyright (c) 2012 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 MODULES_AUDIO_CODING_CODECS_CNG_WEBRTC_CNG_H_
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#define MODULES_AUDIO_CODING_CODECS_CNG_WEBRTC_CNG_H_
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#include <stdint.h>
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#include <cstddef>
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#include "api/array_view.h"
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#include "rtc_base/buffer.h"
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#define WEBRTC_CNG_MAX_LPC_ORDER 12
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namespace webrtc {
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class ComfortNoiseDecoder {
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public:
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ComfortNoiseDecoder();
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~ComfortNoiseDecoder() = default;
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ComfortNoiseDecoder(const ComfortNoiseDecoder&) = delete;
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ComfortNoiseDecoder& operator=(const ComfortNoiseDecoder&) = delete;
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void Reset();
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// Updates the CN state when a new SID packet arrives.
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// `sid` is a view of the SID packet without the headers.
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void UpdateSid(rtc::ArrayView<const uint8_t> sid);
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// Generates comfort noise.
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// `out_data` will be filled with samples - its size determines the number of
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// samples generated. When `new_period` is true, CNG history will be reset
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// before any audio is generated. Returns `false` if outData is too large -
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// currently 640 bytes (equalling 10ms at 64kHz).
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// TODO(ossu): Specify better limits for the size of out_data. Either let it
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// be unbounded or limit to 10ms in the current sample rate.
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bool Generate(rtc::ArrayView<int16_t> out_data, bool new_period);
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private:
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uint32_t dec_seed_;
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int32_t dec_target_energy_;
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int32_t dec_used_energy_;
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int16_t dec_target_reflCoefs_[WEBRTC_CNG_MAX_LPC_ORDER + 1];
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int16_t dec_used_reflCoefs_[WEBRTC_CNG_MAX_LPC_ORDER + 1];
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int16_t dec_filtstate_[WEBRTC_CNG_MAX_LPC_ORDER + 1];
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int16_t dec_filtstateLow_[WEBRTC_CNG_MAX_LPC_ORDER + 1];
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uint16_t dec_order_;
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int16_t dec_target_scale_factor_; /* Q29 */
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int16_t dec_used_scale_factor_; /* Q29 */
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};
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class ComfortNoiseEncoder {
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public:
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// Creates a comfort noise encoder.
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// `fs` selects sample rate: 8000 for narrowband or 16000 for wideband.
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// `interval` sets the interval at which to generate SID data (in ms).
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// `quality` selects the number of refl. coeffs. Maximum allowed is 12.
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ComfortNoiseEncoder(int fs, int interval, int quality);
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~ComfortNoiseEncoder() = default;
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ComfortNoiseEncoder(const ComfortNoiseEncoder&) = delete;
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ComfortNoiseEncoder& operator=(const ComfortNoiseEncoder&) = delete;
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// Resets the comfort noise encoder to its initial state.
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// Parameters are set as during construction.
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void Reset(int fs, int interval, int quality);
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// Analyzes background noise from `speech` and appends coefficients to
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// `output`. Returns the number of coefficients generated. If `force_sid` is
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// true, a SID frame is forced and the internal sid interval counter is reset.
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// Will fail if the input size is too large (> 640 samples, see
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// ComfortNoiseDecoder::Generate).
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size_t Encode(rtc::ArrayView<const int16_t> speech,
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bool force_sid,
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rtc::Buffer* output);
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private:
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size_t enc_nrOfCoefs_;
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int enc_sampfreq_;
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int16_t enc_interval_;
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int16_t enc_msSinceSid_;
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int32_t enc_Energy_;
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int16_t enc_reflCoefs_[WEBRTC_CNG_MAX_LPC_ORDER + 1];
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int32_t enc_corrVector_[WEBRTC_CNG_MAX_LPC_ORDER + 1];
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uint32_t enc_seed_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_CODING_CODECS_CNG_WEBRTC_CNG_H_
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