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108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 F4EXB //
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// written by Edouard Griffiths //
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// //
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// In this version we will use a fixed constant bit rate of 64kbit/s. //
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// With a frame time of 20ms the encoder output size is always 160 bytes. //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include "opus/opus.h"
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#include <QDebug>
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#include <QMutexLocker>
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#include "audioopus.h"
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AudioOpus::AudioOpus() :
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m_encoderState(0),
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m_encoderOK(false),
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m_mutex(QMutex::Recursive)
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{
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qDebug("AudioOpus::AudioOpus: libopus version %s", opus_get_version_string());
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}
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AudioOpus::~AudioOpus()
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{
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if (m_encoderState) {
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opus_encoder_destroy(m_encoderState);
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}
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}
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void AudioOpus::setEncoder(int32_t fs, int nChannels)
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{
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int error;
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bool newInstance = true;
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QMutexLocker mutexLocker(&m_mutex);
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if (m_encoderState) {
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opus_encoder_destroy(m_encoderState);
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}
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m_encoderState = opus_encoder_create(fs, nChannels, OPUS_APPLICATION_AUDIO, &error);
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if (error != OPUS_OK)
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{
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qWarning("AudioOpus::setEncoder: error: %s", opus_strerror(error));
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m_encoderOK = false;
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return;
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}
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else
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{
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qDebug("AudioOpus::setEncoder: fs: %d, nChannels: %d", fs, nChannels);
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m_encoderOK = true;
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}
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error = opus_encoder_ctl(m_encoderState, OPUS_SET_BITRATE(m_bitrate));
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if (error != OPUS_OK)
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{
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qWarning("AudioOpus::setEncoder: set bitrate error: %s", opus_strerror(error));
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m_encoderOK = false;
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return;
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}
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error = opus_encoder_ctl(m_encoderState, OPUS_SET_VBR(0)); // force constant bit rate
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if (error != OPUS_OK)
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{
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qWarning("AudioOpus::setEncoder: set constant bitrate error: %s", opus_strerror(error));
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m_encoderOK = false;
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return;
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}
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}
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int AudioOpus::encode(int frameSize, int16_t *in, uint8_t *out)
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{
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QMutexLocker mutexLocker(&m_mutex);
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if (!m_encoderOK)
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{
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qWarning("AudioOpus::encode: encoder not initialized");
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return 0;
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}
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int nbBytes = opus_encode(m_encoderState, in, frameSize, out, m_maxPacketSize);
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if (nbBytes < 0)
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{
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qWarning("AudioOpus::encode failed: %s", opus_strerror(nbBytes));
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return 0;
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}
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else
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{
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return nbBytes;
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}
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}
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