1// Copyright (C) 2021 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "qvideowindow_p.h"
5#include <QPlatformSurfaceEvent>
6#include <qfile.h>
7#include <qpainter.h>
8#include <private/qguiapplication_p.h>
9#include <private/qmemoryvideobuffer_p.h>
10#include <private/qhwvideobuffer_p.h>
11#include <private/qmultimediautils_p.h>
12#include <private/qvideoframe_p.h>
13#include <qpa/qplatformintegration.h>
14
15QT_BEGIN_NAMESPACE
16
17static QSurface::SurfaceType platformSurfaceType()
18{
19#if defined(Q_OS_DARWIN)
20 return QSurface::MetalSurface;
21#elif defined (Q_OS_WIN)
22 return QSurface::Direct3DSurface;
23#endif
24
25 auto *integration = QGuiApplicationPrivate::platformIntegration();
26
27 if (!integration->hasCapability(cap: QPlatformIntegration::OpenGL))
28 return QSurface::RasterSurface;
29
30 if (QCoreApplication::testAttribute(attribute: Qt::AA_ForceRasterWidgets))
31 return QSurface::RasterSurface;
32
33 if (integration->hasCapability(cap: QPlatformIntegration::RasterGLSurface))
34 return QSurface::RasterGLSurface;
35
36 return QSurface::OpenGLSurface;
37}
38
39QVideoWindowPrivate::QVideoWindowPrivate(QVideoWindow *q)
40 : q(q),
41 m_sink(new QVideoSink)
42{
43 Q_ASSERT(q);
44
45 if (QGuiApplicationPrivate::platformIntegration()->hasCapability(cap: QPlatformIntegration::RhiBasedRendering)) {
46 auto surfaceType = ::platformSurfaceType();
47 q->setSurfaceType(surfaceType);
48 switch (surfaceType) {
49 case QSurface::RasterSurface:
50 case QSurface::OpenVGSurface:
51 // can't use those surfaces, need to render in SW
52 m_graphicsApi = QRhi::Null;
53 break;
54 case QSurface::OpenGLSurface:
55 case QSurface::RasterGLSurface:
56 m_graphicsApi = QRhi::OpenGLES2;
57 break;
58 case QSurface::VulkanSurface:
59 m_graphicsApi = QRhi::Vulkan;
60 break;
61 case QSurface::MetalSurface:
62 m_graphicsApi = QRhi::Metal;
63 break;
64 case QSurface::Direct3DSurface:
65 m_graphicsApi = QRhi::D3D11;
66 break;
67 }
68 }
69
70 QObject::connect(sender: m_sink.get(), signal: &QVideoSink::videoFrameChanged, context: q, slot: &QVideoWindow::setVideoFrame);
71}
72
73QVideoWindowPrivate::~QVideoWindowPrivate()
74{
75 QObject::disconnect(sender: m_sink.get(), signal: &QVideoSink::videoFrameChanged,
76 receiver: q, slot: &QVideoWindow::setVideoFrame);
77}
78
79static const float g_vw_quad[] = {
80 // 4 clockwise rotation of texture vertexes (the second pair)
81 // Rotation 0
82 -1.f, -1.f, 0.f, 0.f,
83 -1.f, 1.f, 0.f, 1.f,
84 1.f, -1.f, 1.f, 0.f,
85 1.f, 1.f, 1.f, 1.f,
86 // Rotation 90
87 -1.f, -1.f, 0.f, 1.f,
88 -1.f, 1.f, 1.f, 1.f,
89 1.f, -1.f, 0.f, 0.f,
90 1.f, 1.f, 1.f, 0.f,
91
92 // Rotation 180
93 -1.f, -1.f, 1.f, 1.f,
94 -1.f, 1.f, 1.f, 0.f,
95 1.f, -1.f, 0.f, 1.f,
96 1.f, 1.f, 0.f, 0.f,
97 // Rotation 270
98 -1.f, -1.f, 1.f, 0.f,
99 -1.f, 1.f, 0.f, 0.f,
100 1.f, -1.f, 1.f, 1.f,
101 1.f, 1.f, 0.f, 1.f
102};
103
104static QShader vwGetShader(const QString &name)
105{
106 QFile f(name);
107 if (f.open(flags: QIODevice::ReadOnly))
108 return QShader::fromSerialized(data: f.readAll());
109
110 return QShader();
111}
112
113void QVideoWindowPrivate::initRhi()
114{
115 if (m_graphicsApi == QRhi::Null)
116 return;
117
118 QRhi::Flags rhiFlags = {};//QRhi::EnableDebugMarkers | QRhi::EnableProfiling;
119
120#if QT_CONFIG(opengl)
121 if (m_graphicsApi == QRhi::OpenGLES2) {
122 m_fallbackSurface.reset(p: QRhiGles2InitParams::newFallbackSurface(format: q->format()));
123 QRhiGles2InitParams params;
124 params.fallbackSurface = m_fallbackSurface.get();
125 params.window = q;
126 params.format = q->format();
127 m_rhi.reset(p: QRhi::create(impl: QRhi::OpenGLES2, params: &params, flags: rhiFlags));
128 }
129#endif
130
131#if QT_CONFIG(vulkan)
132 if (m_graphicsApi == QRhi::Vulkan) {
133 QRhiVulkanInitParams params;
134 params.inst = q->vulkanInstance();
135 params.window = q;
136 m_rhi.reset(p: QRhi::create(impl: QRhi::Vulkan, params: &params, flags: rhiFlags));
137 }
138#endif
139
140#ifdef Q_OS_WIN
141 if (m_graphicsApi == QRhi::D3D11) {
142 QRhiD3D11InitParams params;
143 params.enableDebugLayer = true;
144 m_rhi.reset(QRhi::create(QRhi::D3D11, &params, rhiFlags));
145 }
146#endif
147
148#if QT_CONFIG(metal)
149 if (m_graphicsApi == QRhi::Metal) {
150 QRhiMetalInitParams params;
151 m_rhi.reset(QRhi::create(QRhi::Metal, &params, rhiFlags));
152 }
153#endif
154 if (!m_rhi)
155 return;
156
157 m_swapChain.reset(p: m_rhi->newSwapChain());
158 m_swapChain->setWindow(q);
159 m_renderPass.reset(p: m_swapChain->newCompatibleRenderPassDescriptor());
160 m_swapChain->setRenderPassDescriptor(m_renderPass.get());
161
162 m_vertexBuf.reset(p: m_rhi->newBuffer(type: QRhiBuffer::Immutable, usage: QRhiBuffer::VertexBuffer, size: sizeof(g_vw_quad)));
163 m_vertexBuf->create();
164 m_vertexBufReady = false;
165
166 m_uniformBuf.reset(p: m_rhi->newBuffer(type: QRhiBuffer::Dynamic, usage: QRhiBuffer::UniformBuffer, size: sizeof(QVideoTextureHelper::UniformData)));
167 m_uniformBuf->create();
168
169 m_textureSampler.reset(p: m_rhi->newSampler(magFilter: QRhiSampler::Linear, minFilter: QRhiSampler::Linear, mipmapMode: QRhiSampler::None,
170 addressU: QRhiSampler::ClampToEdge, addressV: QRhiSampler::ClampToEdge));
171 m_textureSampler->create();
172
173 m_shaderResourceBindings.reset(p: m_rhi->newShaderResourceBindings());
174 m_subtitleResourceBindings.reset(p: m_rhi->newShaderResourceBindings());
175
176 m_subtitleUniformBuf.reset(p: m_rhi->newBuffer(type: QRhiBuffer::Dynamic, usage: QRhiBuffer::UniformBuffer, size: sizeof(QVideoTextureHelper::UniformData)));
177 m_subtitleUniformBuf->create();
178}
179
180void QVideoWindowPrivate::setupGraphicsPipeline(QRhiGraphicsPipeline *pipeline, QRhiShaderResourceBindings *bindings, const QVideoFrameFormat &fmt)
181{
182
183 pipeline->setTopology(QRhiGraphicsPipeline::TriangleStrip);
184 QShader vs = vwGetShader(name: QVideoTextureHelper::vertexShaderFileName(format: fmt));
185 Q_ASSERT(vs.isValid());
186 QShader fs = vwGetShader(name: QVideoTextureHelper::fragmentShaderFileName(
187 format: fmt, rhi: m_rhi.get(), surfaceFormat: m_swapChain->format()));
188 Q_ASSERT(fs.isValid());
189 pipeline->setShaderStages({
190 { QRhiShaderStage::Vertex, vs },
191 { QRhiShaderStage::Fragment, fs }
192 });
193 QRhiVertexInputLayout inputLayout;
194 inputLayout.setBindings({
195 { 4 * sizeof(float) }
196 });
197 inputLayout.setAttributes({
198 { 0, 0, QRhiVertexInputAttribute::Float2, 0 },
199 { 0, 1, QRhiVertexInputAttribute::Float2, 2 * sizeof(float) }
200 });
201 pipeline->setVertexInputLayout(inputLayout);
202 pipeline->setShaderResourceBindings(bindings);
203 pipeline->setRenderPassDescriptor(m_renderPass.get());
204 pipeline->create();
205}
206
207void QVideoWindowPrivate::updateTextures(QRhiResourceUpdateBatch *rub)
208{
209 // We render a 1x1 black pixel when we don't have a video
210 if (!m_texturePool.currentFrame().isValid())
211 m_texturePool.setCurrentFrame(QVideoFramePrivate::createFrame(
212 buffer: std::make_unique<QMemoryVideoBuffer>(args: QByteArray{ 4, 0 }, args: 4),
213 format: QVideoFrameFormat(QSize(1, 1), QVideoFrameFormat::Format_RGBA8888)));
214
215 if (!m_texturePool.texturesDirty())
216 return;
217
218 QVideoFrameTextures *textures = m_texturePool.updateTextures(rhi&: *m_rhi, rub&: *rub);
219 if (!textures)
220 return;
221
222 QRhiShaderResourceBinding bindings[4];
223 auto *b = bindings;
224 *(b++) = QRhiShaderResourceBinding::uniformBuffer(binding: 0, stage: QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage,
225 buf: m_uniformBuf.get());
226
227 auto fmt = m_texturePool.currentFrame().surfaceFormat();
228 auto textureDesc = QVideoTextureHelper::textureDescription(format: fmt.pixelFormat());
229
230 for (int i = 0; i < textureDesc->nplanes; ++i)
231 (*b++) = QRhiShaderResourceBinding::sampledTexture(
232 binding: i + 1, stage: QRhiShaderResourceBinding::FragmentStage, tex: textures->texture(plane: i),
233 sampler: m_textureSampler.get());
234 m_shaderResourceBindings->setBindings(first: bindings, last: b);
235 m_shaderResourceBindings->create();
236
237 if (fmt != format) {
238 format = fmt;
239 if (!m_graphicsPipeline)
240 m_graphicsPipeline.reset(p: m_rhi->newGraphicsPipeline());
241
242 setupGraphicsPipeline(pipeline: m_graphicsPipeline.get(), bindings: m_shaderResourceBindings.get(), fmt: format);
243 }
244}
245
246void QVideoWindowPrivate::updateSubtitle(QRhiResourceUpdateBatch *rub, const QSize &frameSize)
247{
248 m_subtitleDirty = false;
249 m_hasSubtitle = !m_texturePool.currentFrame().subtitleText().isEmpty();
250 if (!m_hasSubtitle)
251 return;
252
253 m_subtitleLayout.update(frameSize, text: m_texturePool.currentFrame().subtitleText());
254 QSize size = m_subtitleLayout.bounds.size().toSize();
255
256 QImage img = m_subtitleLayout.toImage();
257
258 m_subtitleTexture.reset(p: m_rhi->newTexture(format: QRhiTexture::RGBA8, pixelSize: size));
259 m_subtitleTexture->create();
260 rub->uploadTexture(tex: m_subtitleTexture.get(), image: img);
261
262 QRhiShaderResourceBinding bindings[2];
263
264 bindings[0] = QRhiShaderResourceBinding::uniformBuffer(binding: 0, stage: QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage,
265 buf: m_subtitleUniformBuf.get());
266
267 bindings[1] = QRhiShaderResourceBinding::sampledTexture(binding: 1, stage: QRhiShaderResourceBinding::FragmentStage,
268 tex: m_subtitleTexture.get(), sampler: m_textureSampler.get());
269 m_subtitleResourceBindings->setBindings(first: bindings, last: bindings + 2);
270 m_subtitleResourceBindings->create();
271
272 if (!m_subtitlePipeline) {
273 m_subtitlePipeline.reset(p: m_rhi->newGraphicsPipeline());
274
275 QRhiGraphicsPipeline::TargetBlend blend;
276 blend.enable = true;
277 m_subtitlePipeline->setTargetBlends({ blend });
278 setupGraphicsPipeline(pipeline: m_subtitlePipeline.get(), bindings: m_subtitleResourceBindings.get(), fmt: QVideoFrameFormat(QSize(1, 1), QVideoFrameFormat::Format_RGBA8888));
279 }
280}
281
282void QVideoWindowPrivate::init()
283{
284 if (initialized)
285 return;
286 initialized = true;
287
288 initRhi();
289
290 if (!m_rhi)
291 backingStore = new QBackingStore(q);
292 else
293 m_sink->setRhi(m_rhi.get());
294}
295
296void QVideoWindowPrivate::resizeSwapChain()
297{
298 m_hasSwapChain = m_swapChain->createOrResize();
299}
300
301void QVideoWindowPrivate::releaseSwapChain()
302{
303 if (m_hasSwapChain) {
304 m_hasSwapChain = false;
305 m_swapChain->destroy();
306 }
307}
308
309void QVideoWindowPrivate::render()
310{
311 if (!initialized)
312 init();
313
314 if (!q->isExposed() || !isExposed)
315 return;
316
317 QRect rect(0, 0, q->width(), q->height());
318
319 if (backingStore) {
320 if (backingStore->size() != q->size())
321 backingStore->resize(size: q->size());
322
323 backingStore->beginPaint(rect);
324
325 QPaintDevice *device = backingStore->paintDevice();
326 if (!device)
327 return;
328 QPainter painter(device);
329
330 QVideoFrame frame = m_texturePool.currentFrame();
331 frame.paint(painter: &painter, rect, options: { .backgroundColor: Qt::black, .aspectRatioMode: aspectRatioMode });
332 painter.end();
333
334 backingStore->endPaint();
335 backingStore->flush(region: rect);
336 return;
337 }
338
339 const VideoTransformation frameTransformation =
340 qNormalizedFrameTransformation(frame: m_texturePool.currentFrame().surfaceFormat());
341 const QSize frameSize = qRotatedFramePresentationSize(frame: m_texturePool.currentFrame());
342 const QSize scaled = frameSize.scaled(s: rect.size(), mode: aspectRatioMode);
343 QRect videoRect = QRect(QPoint(0, 0), scaled);
344 videoRect.moveCenter(p: rect.center());
345 QRect subtitleRect = videoRect.intersected(other: rect);
346
347 if (!m_hasSwapChain || (m_swapChain->currentPixelSize() != m_swapChain->surfacePixelSize()))
348 resizeSwapChain();
349
350 const auto requiredSwapChainFormat =
351 qGetRequiredSwapChainFormat(format: m_texturePool.currentFrame().surfaceFormat());
352 if (qShouldUpdateSwapChainFormat(swapChain: m_swapChain.get(), requiredSwapChainFormat)) {
353 releaseSwapChain();
354 m_swapChain->setFormat(requiredSwapChainFormat);
355 resizeSwapChain();
356 }
357
358 if (!m_hasSwapChain)
359 return;
360
361 QRhi::FrameOpResult r = m_rhi->beginFrame(swapChain: m_swapChain.get());
362
363 if (r == QRhi::FrameOpSwapChainOutOfDate) {
364 resizeSwapChain();
365 if (!m_hasSwapChain)
366 return;
367 r = m_rhi->beginFrame(swapChain: m_swapChain.get());
368 }
369 if (r != QRhi::FrameOpSuccess) {
370 qWarning(msg: "beginFrame failed with %d, retry", r);
371 q->requestUpdate();
372 return;
373 }
374
375 QRhiResourceUpdateBatch *rub = m_rhi->nextResourceUpdateBatch();
376
377 if (!m_vertexBufReady) {
378 m_vertexBufReady = true;
379 rub->uploadStaticBuffer(buf: m_vertexBuf.get(), data: g_vw_quad);
380 }
381
382 updateTextures(rub);
383
384 if (m_subtitleDirty || m_subtitleLayout.videoSize != subtitleRect.size())
385 updateSubtitle(rub, frameSize: subtitleRect.size());
386
387 const float mirrorFrame = frameTransformation.mirroredHorizontallyAfterRotation ? -1.f : 1.f;
388 const float xscale = mirrorFrame * float(videoRect.width()) / float(rect.width());
389 const float yscale = -1.f * float(videoRect.height()) / float(rect.height());
390
391 QMatrix4x4 transform;
392 transform.scale(x: xscale, y: yscale);
393
394 float maxNits = 100;
395 if (m_swapChain->format() == QRhiSwapChain::HDRExtendedSrgbLinear) {
396 auto info = m_swapChain->hdrInfo();
397 if (info.limitsType == QRhiSwapChainHdrInfo::ColorComponentValue)
398 maxNits = 100 * info.limits.colorComponentValue.maxColorComponentValue;
399 else
400 maxNits = info.limits.luminanceInNits.maxLuminance;
401 }
402
403 QByteArray uniformData;
404 QVideoTextureHelper::updateUniformData(dst: &uniformData, rhi: m_rhi.get(),
405 format: m_texturePool.currentFrame().surfaceFormat(),
406 frame: m_texturePool.currentFrame(), transform, opacity: 1.f, maxNits);
407 rub->updateDynamicBuffer(buf: m_uniformBuf.get(), offset: 0, size: uniformData.size(), data: uniformData.constData());
408
409 if (m_hasSubtitle) {
410 QMatrix4x4 st;
411 st.translate(x: 0, y: -2.f * (float(m_subtitleLayout.bounds.center().y()) + float(subtitleRect.top()))/ float(rect.height()) + 1.f);
412 st.scale(x: float(m_subtitleLayout.bounds.width())/float(rect.width()),
413 y: -1.f * float(m_subtitleLayout.bounds.height())/float(rect.height()));
414
415 QByteArray uniformData;
416 QVideoFrameFormat fmt(m_subtitleLayout.bounds.size().toSize(), QVideoFrameFormat::Format_ARGB8888);
417 QVideoTextureHelper::updateUniformData(dst: &uniformData, rhi: m_rhi.get(), format: fmt, frame: QVideoFrame(), transform: st,
418 opacity: 1.f);
419 rub->updateDynamicBuffer(buf: m_subtitleUniformBuf.get(), offset: 0, size: uniformData.size(), data: uniformData.constData());
420 }
421
422 QRhiCommandBuffer *cb = m_swapChain->currentFrameCommandBuffer();
423 cb->beginPass(rt: m_swapChain->currentFrameRenderTarget(), colorClearValue: Qt::black, depthStencilClearValue: { 1.0f, 0 }, resourceUpdates: rub);
424 cb->setGraphicsPipeline(m_graphicsPipeline.get());
425 auto size = m_swapChain->currentPixelSize();
426 cb->setViewport({ 0, 0, float(size.width()), float(size.height()) });
427 cb->setShaderResources(srb: m_shaderResourceBindings.get());
428
429 const quint32 vertexOffset = quint32(sizeof(float)) * 16 * frameTransformation.rotationIndex();
430 const QRhiCommandBuffer::VertexInput vbufBinding(m_vertexBuf.get(), vertexOffset);
431 cb->setVertexInput(startBinding: 0, bindingCount: 1, bindings: &vbufBinding);
432 cb->draw(vertexCount: 4);
433
434 if (m_hasSubtitle) {
435 cb->setGraphicsPipeline(m_subtitlePipeline.get());
436 cb->setShaderResources(srb: m_subtitleResourceBindings.get());
437 const QRhiCommandBuffer::VertexInput vbufBinding(m_vertexBuf.get(), 0);
438 cb->setVertexInput(startBinding: 0, bindingCount: 1, bindings: &vbufBinding);
439 cb->draw(vertexCount: 4);
440 }
441
442 cb->endPass();
443
444 m_rhi->endFrame(swapChain: m_swapChain.get());
445
446 m_texturePool.onFrameEndInvoked();
447}
448
449/*!
450 \class QVideoWindow
451 \internal
452*/
453QVideoWindow::QVideoWindow(QScreen *screen)
454 : QWindow(screen)
455 , d(new QVideoWindowPrivate(this))
456{
457}
458
459QVideoWindow::QVideoWindow(QWindow *parent)
460 : QWindow(parent)
461 , d(new QVideoWindowPrivate(this))
462{
463}
464
465QVideoWindow::~QVideoWindow() = default;
466
467QVideoSink *QVideoWindow::videoSink() const
468{
469 return d->m_sink.get();
470}
471
472Qt::AspectRatioMode QVideoWindow::aspectRatioMode() const
473{
474 return d->aspectRatioMode;
475}
476
477void QVideoWindow::setAspectRatioMode(Qt::AspectRatioMode mode)
478{
479 if (d->aspectRatioMode == mode)
480 return;
481 d->aspectRatioMode = mode;
482 emit aspectRatioModeChanged(mode);
483}
484
485bool QVideoWindow::event(QEvent *e)
486{
487 switch (e->type()) {
488 case QEvent::UpdateRequest:
489 d->render();
490 return true;
491
492 case QEvent::PlatformSurface:
493 // this is the proper time to tear down the swapchain (while the native window and surface are still around)
494 if (static_cast<QPlatformSurfaceEvent *>(e)->surfaceEventType() == QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed) {
495 d->releaseSwapChain();
496 d->isExposed = false;
497 }
498 break;
499 case QEvent::Expose:
500 d->isExposed = isExposed();
501 if (d->isExposed)
502 d->render();
503 return true;
504
505 default:
506 break;
507 }
508
509 return QWindow::event(e);
510}
511
512void QVideoWindow::resizeEvent(QResizeEvent *resizeEvent)
513{
514 if (!d->backingStore)
515 return;
516 if (!d->initialized)
517 d->init();
518 d->backingStore->resize(size: resizeEvent->size());
519}
520
521void QVideoWindow::setVideoFrame(const QVideoFrame &frame)
522{
523 if (d->m_texturePool.currentFrame().subtitleText() != frame.subtitleText())
524 d->m_subtitleDirty = true;
525 d->m_texturePool.setCurrentFrame(frame);
526 if (d->isExposed)
527 requestUpdate();
528}
529
530QT_END_NAMESPACE
531
532#include "moc_qvideowindow_p.cpp"
533

source code of qtmultimedia/src/multimedia/video/qvideowindow.cpp