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74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
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/*
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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 WEBRTC_MODULES_AUDIO_CODING_NETEQ_COMFORT_NOISE_H_
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#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_COMFORT_NOISE_H_
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/modules/audio_coding/neteq/audio_multi_vector.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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// Forward declarations.
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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, 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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internal_error_code_(0) {
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}
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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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// Will delete the packet.
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int UpdateParameters(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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DISALLOW_COPY_AND_ASSIGN(ComfortNoise);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_COMFORT_NOISE_H_
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