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604fd2f1ab
Bug: webrtc:13555, webrtc:13082 Change-Id: I2c2cbcbd918f0cfa970c1a964893220ba11d4b41 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/247960 Reviewed-by: Artem Titov <titovartem@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: (Daniel.L) Byoungchan Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#35771}
72 lines
2.2 KiB
C++
72 lines
2.2 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_NETEQ_COMFORT_NOISE_H_
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#define MODULES_AUDIO_CODING_NETEQ_COMFORT_NOISE_H_
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#include <stddef.h>
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namespace webrtc {
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// Forward declarations.
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class AudioMultiVector;
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class DecoderDatabase;
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class SyncBuffer;
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struct Packet;
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// This class acts as an interface to the CNG generator.
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class ComfortNoise {
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public:
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enum ReturnCodes {
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kOK = 0,
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kUnknownPayloadType,
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kInternalError,
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kMultiChannelNotSupported
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};
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ComfortNoise(int fs_hz,
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DecoderDatabase* decoder_database,
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SyncBuffer* sync_buffer)
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: fs_hz_(fs_hz),
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first_call_(true),
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overlap_length_(5 * fs_hz_ / 8000),
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decoder_database_(decoder_database),
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sync_buffer_(sync_buffer) {}
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ComfortNoise(const ComfortNoise&) = delete;
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ComfortNoise& operator=(const ComfortNoise&) = delete;
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// Resets the state. Should be called before each new comfort noise period.
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void Reset();
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// Update the comfort noise generator with the parameters in `packet`.
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int UpdateParameters(const Packet& packet);
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// Generates `requested_length` samples of comfort noise and writes to
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// `output`. If this is the first in call after Reset (or first after creating
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// the object), it will also mix in comfort noise at the end of the
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// SyncBuffer object provided in the constructor.
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int Generate(size_t requested_length, AudioMultiVector* output);
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// Returns the last error code that was produced by the comfort noise
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// decoder. Returns 0 if no error has been encountered since the last reset.
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int internal_error_code() { return internal_error_code_; }
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private:
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int fs_hz_;
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bool first_call_;
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size_t overlap_length_;
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DecoderDatabase* decoder_database_;
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SyncBuffer* sync_buffer_;
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int internal_error_code_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_CODING_NETEQ_COMFORT_NOISE_H_
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