////  OpusCodecManager.h//  plugins/opusCodec/src////  Copyright 2020 Dale Glass////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include <PerfStat.h>#include <QtCore/QLoggingCategory>#include <AudioConstants.h> #include "OpusDecoder.h" static QLoggingCategory decoder("AthenaOpusDecoder"); static QString error_to_string(int error) {    switch (error) {        case OPUS_OK:            return "OK";        case OPUS_BAD_ARG:            return "One or more invalid/out of range arguments.";        case OPUS_BUFFER_TOO_SMALL:            return "The mode struct passed is invalid.";        case OPUS_INTERNAL_ERROR:            return "An internal error was detected.";        case OPUS_INVALID_PACKET:            return "The compressed data passed is corrupted.";        case OPUS_UNIMPLEMENTED:            return "Invalid/unsupported request number.";        case OPUS_INVALID_STATE:            return "An encoder or decoder structure is invalid or already freed.";        default:            return QString("Unknown error code: %i").arg(error);    }}  AthenaOpusDecoder::AthenaOpusDecoder(int sampleRate, int numChannels) {    int error;     _opusSampleRate = sampleRate;    _opusNumChannels = numChannels;     _decoder = opus_decoder_create(sampleRate, numChannels, &error);     if (error != OPUS_OK) {        qCCritical(decoder) << "Failed to initialize Opus encoder: " << error_to_string(error);        _decoder = nullptr;        return;    }      qCDebug(decoder) << "Opus decoder initialized, sampleRate = " << sampleRate << "; numChannels = " << numChannels;} AthenaOpusDecoder::~AthenaOpusDecoder() {    if (_decoder) {        opus_decoder_destroy(_decoder);    } } void AthenaOpusDecoder::decode(const QByteArray &encodedBuffer, QByteArray &decodedBuffer) {    assert(_decoder);    PerformanceTimer perfTimer("AthenaOpusDecoder::decode");     // The audio system encodes and decodes always in fixed size chunks    int bufferSize = AudioConstants::NETWORK_FRAME_SAMPLES_PER_CHANNEL * static_cast<int>(sizeof(int16_t))        * _opusNumChannels;     decodedBuffer.resize(bufferSize);    int bufferFrames = decodedBuffer.size() / _opusNumChannels / static_cast<int>(sizeof(opus_int16));    int decoded_frames = opus_decode(_decoder, reinterpret_cast<const unsigned char*>(encodedBuffer.data()),        encodedBuffer.length(), reinterpret_cast<opus_int16*>(decodedBuffer.data()), bufferFrames, 0);     if (decoded_frames >= 0) {         if (decoded_frames < bufferFrames) {            qCWarning(decoder) << "Opus decoder returned " << decoded_frames << ", but " << bufferFrames                << " were expected!";             int start = decoded_frames * static_cast<int>(sizeof(int16_t)) * _opusNumChannels;            memset( &decodedBuffer.data()[start], 0, static_cast<size_t>(decodedBuffer.length() - start));        } else if (decoded_frames > bufferFrames) {            // This should never happen            qCCritical(decoder) << "Opus decoder returned " << decoded_frames << ", but only " << bufferFrames                << " were expected! Buffer overflow!?";        }    } else {        qCCritical(decoder) << "Failed to decode audio: " << error_to_string(decoded_frames);        decodedBuffer.fill('\0');    } } void AthenaOpusDecoder::lostFrame(QByteArray &decodedBuffer) {    assert(_decoder);     PerformanceTimer perfTimer("AthenaOpusDecoder::lostFrame");     int bufferSize = AudioConstants::NETWORK_FRAME_SAMPLES_PER_CHANNEL * static_cast<int>(sizeof(int16_t))        * _opusNumChannels;    decodedBuffer.resize(bufferSize);    int bufferFrames = decodedBuffer.size() / _opusNumChannels / static_cast<int>(sizeof(opus_int16));     int decoded_frames = opus_decode(_decoder, nullptr, 0, reinterpret_cast<opus_int16*>(decodedBuffer.data()),        bufferFrames, 1);     if (decoded_frames >= 0) {         if ( decoded_frames < bufferFrames ) {            qCWarning(decoder) << "Opus decoder returned " << decoded_frames << ", but " << bufferFrames                << " were expected!";             int start = decoded_frames * static_cast<int>(sizeof(int16_t)) * _opusNumChannels;            memset( &decodedBuffer.data()[start], 0, static_cast<size_t>(decodedBuffer.length() - start));        } else if (decoded_frames > bufferFrames) {            // This should never happen            qCCritical(decoder) << "Opus decoder returned " << decoded_frames << ", but only " << bufferFrames                << " were expected! Buffer overflow!?";        }     } else {        qCCritical(decoder) << "Failed to decode lost frame: " << error_to_string(decoded_frames);        decodedBuffer.fill('\0');    } }