C++ QT实现录音、播放音频控制器【嵌入式QT GUI设计】.zip

/****************************************************************** Copyright © Deng Zhimao Co., Ltd. 1990-2021. All rights reserved. * @projectName audiorecorder * @brief audiorecorder.cpp * @author Deng Zhimao * @email [email protected] * @net www.openedv.com * @date 2021-06-04 *******************************************************************/ #include "audiorecorder.h" #include <QDebug> #include <QUrl> #include <QDateTime> #include <QDir> #include <QCoreApplication> static qreal getPeakValue(const QAudioFormat &format); static QVector<qreal> getBufferLevels(const QAudioBuffer &buffer); template <class T> static QVector<qreal> getBufferLevels(const T *buffer, int frames, int channels); AudioRecorder::AudioRecorder(QWidget *parent) { Q_UNUSED(parent); /* 录制音频的类 */ m_audioRecorder = new QAudioRecorder(this); /* 用于探测缓冲区的数据 */ m_probe = new QAudioProbe(this); /* 信号槽连接，更新录音level显示 */ connect(m_probe, &QAudioProbe::audioBufferProbed, this, &AudioRecorder::processBuffer); /* 设置探测的对象 */ m_probe->setSource(m_audioRecorder); /* 扫描本地声卡设备 */ devicesVar.append(QVariant(QString())); for (auto &device: m_audioRecorder->audioInputs()) { devicesVar.append(QVariant(device)); //qDebug()<<"本地声卡设备："<<device<<endl; } /* 音频编码 */ codecsVar.append(QVariant(QString())); for (auto &codecName: m_audioRecorder->supportedAudioCodecs()) { codecsVar.append(QVariant(codecName)); //qDebug()<<"音频编码："<<codecName<<endl; } /* 容器/支持的格式 */ containersVar.append(QVariant(QString())); for (auto &containerName: m_audioRecorder->supportedContainers()) { containersVar.append(QVariant(containerName)); //qDebug()<<"支持的格式："<<containerName<<endl; } /* 采样率 */ sampleRateVar.append(QVariant(0)); /* 百度语音识别只支持8000、 16000采样率 */ sampleRateVar.append(QVariant(8000)); sampleRateVar.append(QVariant(16000)); for (int sampleRate: m_audioRecorder->supportedAudioSampleRates()) { sampleRateVar.append(QVariant(sampleRate)); //qDebug()<<"采样率："<<sampleRate<<endl; } /* 通道 */ channelsVar.append(QVariant(-1)); channelsVar.append(QVariant(1)); channelsVar.append(QVariant(2)); channelsVar.append(QVariant(4)); /* 质量 */ qualityVar.append(QVariant(int(QMultimedia::LowQuality))); qualityVar.append(QVariant(int(QMultimedia::NormalQuality))); qualityVar.append(QVariant(int(QMultimedia::HighQuality))); /* 比特率 */ bitratesVar.append(QVariant(0)); bitratesVar.append(QVariant(32000)); bitratesVar.append(QVariant(64000)); bitratesVar.append(QVariant(96000)); bitratesVar.append(QVariant(128000)); /* 录音类信号槽连接 */ connect(m_audioRecorder, &QAudioRecorder::durationChanged, this, &AudioRecorder::updateProgress); } AudioRecorder::~AudioRecorder() { } void AudioRecorder::startRecorder() { /* 备注：录音需要设置成16000 采样率和通道数为1， * 保存为wav文件需要设置成audio/x-wav（container文件格式） */ /* 如果录音已经停止，则开始录音 */ if (m_audioRecorder->state() == QMediaRecorder::StoppedState) { /* 设置默认的录音设备 */ m_audioRecorder->setAudioInput(devicesVar.at(0).toString()); /* 下面的是录音设置 */ QAudioEncoderSettings settings; settings.setCodec(codecsVar.at(0).toString()); settings.setSampleRate(sampleRateVar[2].toInt()); settings.setBitRate(bitratesVar[0].toInt()); settings.setChannelCount(channelsVar[1].toInt()); settings.setQuality(QMultimedia::EncodingQuality( qualityVar[0].toInt())); /* 以恒定的质量录制，可选恒定的比特率 */ settings.setEncodingMode(QMultimedia::ConstantQualityEncoding); /* I.MX6ULL第20个支持的格式为 audio/x-wav */ QString container = containersVar.at(20).toString(); /* 使用配置 */ m_audioRecorder->setEncodingSettings(settings, QVideoEncoderSettings(), container); /* 录音保存为16k.wav文件 */ m_audioRecorder->setOutputLocation(QUrl::fromLocalFile(tr("./16k.wav"))); /* 开始录音 */ m_audioRecorder->record(); } } void AudioRecorder::stopRecorder() { /* 停止录音 */ m_audioRecorder->stop(); } void AudioRecorder::updateProgress(qint64 duration) { Q_UNUSED(duration); if (m_audioRecorder->error() != QMediaRecorder::NoError) return; /* 打印录制时长 */ //qDebug()<<duration / 1000<<endl; } void AudioRecorder::clearAudioLevels() { //... } // This function returns the maximum possible sample value for a given audio format qreal getPeakValue(const QAudioFormat& format) { // Note: Only the most common sample formats are supported if (!format.isValid()) return qreal(0); if (format.codec() != "audio/pcm") return qreal(0); switch (format.sampleType()) { case QAudioFormat::Unknown: break; case QAudioFormat::Float: if (format.sampleSize() != 32) // other sample formats are not supported return qreal(0); return qreal(1.00003); case QAudioFormat::SignedInt: if (format.sampleSize() == 32) return qreal(INT_MAX); if (format.sampleSize() == 16) return qreal(SHRT_MAX); if (format.sampleSize() == 8) return qreal(CHAR_MAX); break; case QAudioFormat::UnSignedInt: if (format.sampleSize() == 32) return qreal(UINT_MAX); if (format.sampleSize() == 16) return qreal(USHRT_MAX); if (format.sampleSize() == 8) return qreal(UCHAR_MAX); break; } return qreal(0); } // returns the audio level for each channel QVector<qreal> getBufferLevels(const QAudioBuffer& buffer) { QVector<qreal> values; if (!buffer.format().isValid() || buffer.format().byteOrder() != QAudioFormat::LittleEndian) return values; if (buffer.format().codec() != "audio/pcm") return values; int channelCount = buffer.format().channelCount(); values.fill(0, channelCount); qreal peak_value = getPeakValue(buffer.format()); if (qFuzzyCompare(peak_value, qreal(0))) return values; switch (buffer.format().sampleType()) { case QAudioFormat::Unknown: case QAudioFormat::UnSignedInt: if (buffer.format().sampleSize() == 32) values = getBufferLevels(buffer.constData<quint32>(), buffer.frameCount(), channelCount); if (buffer.format().sampleSize() == 16) values = getBufferLevels(buffer.constData<quint16>(), buffer.frameCount(), channelCount); if (buffer.format().sampleSize() == 8) values = getBufferLevels(buffer.constData<quint8>(), buffer.frameCount(), channelCount); for (int i = 0; i < values.size(); ++i) values[i] = qAbs(values.at(i) - peak_value / 2) / (peak_value / 2); break; case QAudioFormat::Float: if (buffer.format().sampleSize() == 32) { values = getBufferLevels(buffer.constData<float>(), buffer.frameCount(), channelCount); for (int i = 0; i < values.size(); ++i) values[i] /= peak_value; } break; case QAudioFormat::SignedInt: if (buffer.format().sampleSize() == 32) values = getBufferLevels(buffer.constData<qint32>(), buffer.frameCount(), channelCount); if (buffer.format().sampleSize() == 16) values = getBu