custommediainputsnippets.cpp

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// Copyright (C) 2024 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include "custommediainputsnippets.h"

void CustomMediaInputSnippets::setupAndRecordVideo()

    //! [QVideoFrameInput setup]

    QMediaCaptureSession session;

    QMediaRecorder recorder;

    QVideoFrameInput videoInput;

    session.setRecorder(&recorder);

    session.setVideoFrameInput(&videoInput);

    MediaGenerator generator; // Custom class providing video frames

    connect(&videoInput, &QVideoFrameInput::readyToSendVideoFrame,

            &generator, &MediaGenerator::nextVideoFrame);

    connect(&generator, &MediaGenerator::videoFrameReady,

            &videoInput, &QVideoFrameInput::sendVideoFrame);

    recorder.record();

    //! [QVideoFrameInput setup]

    // Start event loop here to keep objects alive and make the snippets runnable without crashing

    QTimer::singleShot(1000, qApp, &QCoreApplication::quit); // Close the app after 1 second

    qApp->exec();

void CustomMediaInputSnippets::setupAndRecordAudio()

    //! [QAudioBufferInput setup]

    QMediaCaptureSession session;

    QMediaRecorder recorder;

    QAudioBufferInput audioInput;

    session.setRecorder(&recorder);

    session.setAudioBufferInput(&audioInput);

    MediaGenerator generator; // Custom class providing audio buffers

    connect(&audioInput, &QAudioBufferInput::readyToSendAudioBuffer,

            &generator, &MediaGenerator::nextAudioBuffer);

    connect(&generator, &MediaGenerator::audioBufferReady,

            &audioInput, &QAudioBufferInput::sendAudioBuffer);

    recorder.record();

    //! [QAudioBufferInput setup]

    // Start event loop here to keep objects alive and make the snippets runnable without crashing

    QTimer::singleShot(1000, qApp, &QCoreApplication::quit); // Close the app after 1 second

    qApp->exec();

//! [nextVideoFrame()]

void MediaGenerator::nextVideoFrame()

    QVideoFrame frame = nextFrame();

    emit videoFrameReady(frame);

//! [nextVideoFrame()]

//! [nextAudioBuffer()]

void MediaGenerator::nextAudioBuffer()

    QAudioBuffer buffer = nextBuffer();

    emit audioBufferReady(buffer);

//! [nextAudioBuffer()]

QVideoFrame MediaGenerator::nextFrame()

    // Create mock video frame which is not interpretet as empty by the recorder

    QVideoFrameFormat format(QSize(1080, 720), QVideoFrameFormat::Format_NV12);

    QVideoFrame frame(format);

    return frame;

QAudioBuffer MediaGenerator::nextBuffer()

    // Create mock audio buffer which is not interpretet as empty by the recorder

    QAudioFormat format;

    format.setSampleRate(48000);

    format.setChannelCount(2);

    format.setSampleFormat(QAudioFormat::Float);

    int bufferSize = format.bytesPerSample() * 128;

    QByteArray byteArray(bufferSize, 0);

    return QAudioBuffer(byteArray, format);