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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "avfvideoframerenderer.h"
#include <QtMultimedia/qabstractvideosurface.h>
#include <QtGui/QOpenGLFramebufferObject>
#include <QtGui/QOpenGLShaderProgram>
#include <QtGui/QOffscreenSurface>
#include <QtCore/private/qcore_mac_p.h>
#ifdef QT_DEBUG_AVF
#include <QtCore/qdebug.h>
#endif
#ifdef Q_OS_MACOS
#import <AppKit/AppKit.h>
#include <CoreVideo/CVOpenGLTextureCache.h>
#endif
#import <CoreVideo/CVBase.h>
#import <AVFoundation/AVFoundation.h>
QT_USE_NAMESPACE
AVFVideoFrameRenderer::AVFVideoFrameRenderer(QAbstractVideoSurface *surface, QObject *parent)
: QObject(parent)
, m_glContext(nullptr)
, m_offscreenSurface(nullptr)
, m_surface(surface)
, m_textureCache(nullptr)
, m_videoOutput(nullptr)
, m_isContextShared(true)
{
m_videoOutput = [[AVPlayerItemVideoOutput alloc] initWithPixelBufferAttributes:@{
(NSString *)kCVPixelBufferPixelFormatTypeKey: @(kCVPixelFormatType_32BGRA),
(NSString *)kCVPixelBufferOpenGLCompatibilityKey: @YES
}];
[m_videoOutput setDelegate:nil queue:nil];
#ifdef Q_OS_MACOS
m_fbo[0] = nullptr;
m_fbo[1] = nullptr;
#endif
}
AVFVideoFrameRenderer::~AVFVideoFrameRenderer()
{
#ifdef QT_DEBUG_AVF
qDebug() << Q_FUNC_INFO;
#endif
[m_videoOutput release];
if (m_textureCache)
CFRelease(m_textureCache);
delete m_offscreenSurface;
delete m_glContext;
#ifdef Q_OS_MACOS
delete m_fbo[0];
delete m_fbo[1];
#endif
}
#ifdef Q_OS_MACOS
GLuint AVFVideoFrameRenderer::renderLayerToFBO(AVPlayerLayer *layer, QSize *size)
{
QCFType<CVOGLTextureRef> texture = renderLayerToTexture(layer, size);
if (!texture)
return 0;
Q_ASSERT(size);
// Do we have FBO's already?
if ((!m_fbo[0] && !m_fbo[0]) || (m_fbo[0]->size() != *size)) {
delete m_fbo[0];
delete m_fbo[1];
m_fbo[0] = new QOpenGLFramebufferObject(*size);
m_fbo[1] = new QOpenGLFramebufferObject(*size);
}
// Switch buffer target
m_currentFBO = !m_currentFBO;
QOpenGLFramebufferObject *fbo = m_fbo[m_currentFBO];
if (!fbo || !fbo->bind())
return 0;
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glViewport(0, 0, size->width(), size->height());
if (!m_blitter.isCreated())
m_blitter.create();
m_blitter.bind(GL_TEXTURE_RECTANGLE);
m_blitter.blit(CVOpenGLTextureGetName(texture), QMatrix4x4(), QMatrix3x3());
m_blitter.release();
glFinish();
fbo->release();
return fbo->texture();
}
#endif
CVOGLTextureRef AVFVideoFrameRenderer::renderLayerToTexture(AVPlayerLayer *layer, QSize *size)
{
initRenderer();
// If the glContext isn't shared, it doesn't make sense to return a texture for us
if (!m_isContextShared)
return nullptr;
size_t width = 0, height = 0;
auto texture = createCacheTextureFromLayer(layer, width, height);
if (size)
*size = QSize(width, height);
return texture;
}
CVPixelBufferRef AVFVideoFrameRenderer::copyPixelBufferFromLayer(AVPlayerLayer *layer,
size_t& width, size_t& height)
{
//Is layer valid
if (!layer) {
#ifdef QT_DEBUG_AVF
qWarning("copyPixelBufferFromLayer: invalid layer");
#endif
return nullptr;
}
AVPlayerItem *item = layer.player.currentItem;
if (![item.outputs containsObject:m_videoOutput])
[item addOutput:m_videoOutput];
CFTimeInterval currentCAFrameTime = CACurrentMediaTime();
CMTime currentCMFrameTime = [m_videoOutput itemTimeForHostTime:currentCAFrameTime];
// Happens when buffering / loading
if (CMTimeCompare(currentCMFrameTime, kCMTimeZero) < 0)
return nullptr;
if (![m_videoOutput hasNewPixelBufferForItemTime:currentCMFrameTime])
return nullptr;
CVPixelBufferRef pixelBuffer = [m_videoOutput copyPixelBufferForItemTime:currentCMFrameTime
itemTimeForDisplay:nil];
if (!pixelBuffer) {
#ifdef QT_DEBUG_AVF
qWarning("copyPixelBufferForItemTime returned nil");
CMTimeShow(currentCMFrameTime);
#endif
return nullptr;
}
width = CVPixelBufferGetWidth(pixelBuffer);
height = CVPixelBufferGetHeight(pixelBuffer);
return pixelBuffer;
}
CVOGLTextureRef AVFVideoFrameRenderer::createCacheTextureFromLayer(AVPlayerLayer *layer,
size_t& width, size_t& height)
{
CVPixelBufferRef pixelBuffer = copyPixelBufferFromLayer(layer, width, height);
if (!pixelBuffer)
return nullptr;
CVOGLTextureCacheFlush(m_textureCache, 0);
CVOGLTextureRef texture = nullptr;
#ifdef Q_OS_MACOS
CVReturn err = CVOpenGLTextureCacheCreateTextureFromImage(kCFAllocatorDefault,
m_textureCache,
pixelBuffer,
nil,
&texture);
#else
CVReturn err = CVOGLTextureCacheCreateTextureFromImage(kCFAllocatorDefault, m_textureCache, pixelBuffer, nullptr,
GL_TEXTURE_2D, GL_RGBA,
(GLsizei) width, (GLsizei) height,
GL_BGRA, GL_UNSIGNED_BYTE, 0,
&texture);
#endif
if (!texture || err) {
qWarning() << "CVOGLTextureCacheCreateTextureFromImage failed error:" << err << m_textureCache;
}
CVPixelBufferRelease(pixelBuffer);
return texture;
}
QImage AVFVideoFrameRenderer::renderLayerToImage(AVPlayerLayer *layer, QSize *size)
{
size_t width = 0;
size_t height = 0;
CVPixelBufferRef pixelBuffer = copyPixelBufferFromLayer(layer, width, height);
if (size)
*size = QSize(width, height);
if (!pixelBuffer)
return QImage();
OSType pixelFormat = CVPixelBufferGetPixelFormatType(pixelBuffer);
if (pixelFormat != kCVPixelFormatType_32BGRA) {
#ifdef QT_DEBUG_AVF
qWarning("CVPixelBuffer format is not BGRA32 (got: %d)", static_cast<quint32>(pixelFormat));
#endif
return QImage();
}
CVPixelBufferLockBaseAddress(pixelBuffer, 0);
char *data = (char *)CVPixelBufferGetBaseAddress(pixelBuffer);
size_t stride = CVPixelBufferGetBytesPerRow(pixelBuffer);
// format here is not relevant, only using for storage
QImage img = QImage(width, height, QImage::Format_ARGB32);
for (size_t j = 0; j < height; j++) {
memcpy(img.scanLine(j), data, width * 4);
data += stride;
}
CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
CVPixelBufferRelease(pixelBuffer);
return img;
}
void AVFVideoFrameRenderer::initRenderer()
{
// even for using a texture directly, we need to be able to make a context current,
// so we need an offscreen, and we shouldn't assume we can make the surface context
// current on that offscreen, so use our own (sharing with it). Slightly
// excessive but no performance penalty and makes the QImage path easier to maintain
//Make sure we have an OpenGL context to make current
if (!m_glContext) {
//Create OpenGL context and set share context from surface
QOpenGLContext *shareContext = nullptr;
if (m_surface)
shareContext = qobject_cast<QOpenGLContext*>(m_surface->property("GLContext").value<QObject*>());
m_glContext = new QOpenGLContext();
if (shareContext) {
m_glContext->setShareContext(shareContext);
m_isContextShared = true;
} else {
#ifdef QT_DEBUG_AVF
qWarning("failed to get Render Thread context");
#endif
m_isContextShared = false;
}
if (!m_glContext->create()) {
#ifdef QT_DEBUG_AVF
qWarning("failed to create QOpenGLContext");
#endif
return;
}
}
if (!m_offscreenSurface) {
m_offscreenSurface = new QOffscreenSurface();
m_offscreenSurface->setFormat(m_glContext->format());
m_offscreenSurface->create();
}
// Need current context
m_glContext->makeCurrent(m_offscreenSurface);
if (!m_textureCache) {
#ifdef Q_OS_MACOS
auto *currentContext = NSOpenGLContext.currentContext;
// Create an OpenGL CoreVideo texture cache from the pixel buffer.
auto err = CVOpenGLTextureCacheCreate(
kCFAllocatorDefault,
nullptr,
currentContext.CGLContextObj,
currentContext.pixelFormat.CGLPixelFormatObj,
nil,
&m_textureCache);
#else
CVReturn err = CVOGLTextureCacheCreate(kCFAllocatorDefault, nullptr,
[EAGLContext currentContext],
nullptr, &m_textureCache);
#endif
if (err)
qWarning("Error at CVOGLTextureCacheCreate %d", err);
}
}
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