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/****************************************************************************
**
** Copyright (C) 2018 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QMutexLocker>
#include <QtMultimedia/QVideoFrame>
#include "videoplayer.h"
TextureWidget::TextureWidget(QWidget *parent)
: QOpenGLWidget(parent)
, m_texture(QOpenGLTexture::Target2D)
{
// Lock mutex so that we never process a frame until we have been initialized
m_mutex.lock();
}
// Main thread
void TextureWidget::initializeGL()
{
initializeOpenGLFunctions();
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
if (!m_shader.addShaderFromSourceCode(QOpenGLShader::Vertex,
"#version 330\n"
"out vec2 coords;\n"
"const vec2 positions[6] = vec2[] ("
" vec2(-1.0, 1.0),"
" vec2(-1.0, -1.0),"
" vec2(1.0, 1.0),"
" vec2(1.0, 1.0),"
" vec2(-1.0, -1.0),"
" vec2(1.0, -1.0));\n"
"const vec2 texCoords[6] = vec2[] ("
" vec2(0.0, 0.0),"
" vec2(0.0, 1.0),"
" vec2(1.0, 0.0),"
" vec2(1.0, 0.0),"
" vec2(0.0, 1.0),"
" vec2(1.0, 1.0));\n"
"void main() {\n"
" coords = texCoords[gl_VertexID];\n"
" gl_Position = vec4(positions[gl_VertexID], 0.0, 1.0);\n"
"}"))
qDebug() << "Failed to load vertex shader" << m_shader.log();
if (!m_shader.addShaderFromSourceCode(QOpenGLShader::Fragment,
"#version 330\n"
"in vec2 coords;\n"
"uniform sampler2D video_texture;\n"
"out vec4 fragColor;\n"
"void main() {\n"
" fragColor = texture(video_texture, coords);\n"
"}"))
qDebug() << "Failed to load fragment shader" << m_shader.log();
if (!m_shader.link())
qDebug() << "Failed to link shaders" << m_shader.log();
qDebug() << Q_FUNC_INFO << context()->shareContext();
m_vao.create();
// Allow rendering/frame acquisition to go on
m_mutex.unlock();
}
// Main thread
void TextureWidget::paintGL()
{
QMutexLocker lock(&m_mutex);
glViewport(0, 0, width(), height());
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
if (!m_texture.isCreated())
return;
m_shader.bind();
m_texture.bind(0);
m_shader.setUniformValue("video_texture", 0);
m_vao.bind();
glDrawArrays(GL_TRIANGLES, 0, 6);
m_vao.release();
m_shader.release();
}
// Video Player thread
void TextureWidget::setVideoFrame(const QVideoFrame &frame)
{
// Ensure we won't be rendering while we are processing the frame
QMutexLocker lock(&m_mutex);
QVideoFrame f = frame;
// Map frame
if (!f.map(QAbstractVideoBuffer::ReadOnly))
return;
makeCurrent();
// Create or recreate texture
if (m_texture.width() != f.width() || m_texture.height() != f.height()) {
if (m_texture.isCreated())
m_texture.destroy();
m_texture.setSize(f.width(), f.height());
m_texture.setFormat(QOpenGLTexture::RGBA32F);
m_texture.setWrapMode(QOpenGLTexture::ClampToBorder);
m_texture.setMinificationFilter(QOpenGLTexture::Nearest);
m_texture.setMagnificationFilter(QOpenGLTexture::Nearest);
m_texture.allocateStorage();
m_texture.create();
emit textureIdChanged(m_texture.textureId());
}
const QVideoFrame::PixelFormat pFormat = f.pixelFormat();
if (pFormat == QVideoFrame::Format_RGB32) {
m_texture.setData(QOpenGLTexture::RGBA, QOpenGLTexture::UInt8, f.bits());
}
doneCurrent();
// Request display udpate
QOpenGLWidget::update();
// Unmap
f.unmap();
}
QList<QVideoFrame::PixelFormat> GLVideoSurface::supportedPixelFormats(QAbstractVideoBuffer::HandleType type) const
{
if (type == QAbstractVideoBuffer::NoHandle)
return {
QVideoFrame::Format_RGB32,
QVideoFrame::Format_ARGB32,
QVideoFrame::Format_BGR32,
QVideoFrame::Format_BGRA32
};
return {};
}
// Video player thread
bool GLVideoSurface::present(const QVideoFrame &frame)
{
emit onNewFrame(frame);
return true;
}
VideoPlayerThread::VideoPlayerThread(TextureWidget *textureWidget)
: QThread(textureWidget)
, m_player(new QMediaPlayer(nullptr, QMediaPlayer::VideoSurface))
, m_surface(new GLVideoSurface())
{
m_player->moveToThread(this);
m_player->setMedia(QUrl("https://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_1mb.mp4"));
// Tell player to render on GLVideoSurface
m_surface->moveToThread(this);
m_player->setVideoOutput(m_surface.get());
// Display errors
QObject::connect(m_player.get(), QOverload<QMediaPlayer::Error>::of(&QMediaPlayer::error),
m_player.get(), [this] (QMediaPlayer::Error e) {
qDebug() << Q_FUNC_INFO << e << m_player->errorString();
});
// Repeat video indefinitely
QObject::connect(m_player.get(), &QMediaPlayer::stateChanged, m_player.get(), [this] (QMediaPlayer::State state) {
if (state == QMediaPlayer::StoppedState)
m_player->play();
});
// Start playing when thread starts
QObject::connect(this, &QThread::started, this, [this] { m_player->play(); });
// Direct connection between 2 objects living in different threads
QObject::connect(m_surface.get(), &GLVideoSurface::onNewFrame,
textureWidget, &TextureWidget::setVideoFrame, Qt::DirectConnection);
}
VideoPlayerThread::~VideoPlayerThread()
{
exit(0);
wait();
}
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