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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qavfsamplebufferdelegate_p.h"
#define AVMediaType XAVMediaType
#include "qffmpeghwaccel_p.h"
#include "qavfhelpers_p.h"
#include "qffmpegvideobuffer_p.h"
#undef AVMediaType
#include <optional>
QT_USE_NAMESPACE
static void releaseHwFrame(void * /*opaque*/, uint8_t *data)
{
CVPixelBufferRelease(CVPixelBufferRef(data));
}
namespace {
class CVImageVideoBuffer : public QAbstractVideoBuffer
{
public:
CVImageVideoBuffer(CVImageBufferRef imageBuffer)
: QAbstractVideoBuffer(QVideoFrame::NoHandle), m_buffer(imageBuffer)
{
CVPixelBufferRetain(imageBuffer);
}
~CVImageVideoBuffer()
{
CVImageVideoBuffer::unmap();
CVPixelBufferRelease(m_buffer);
}
CVImageVideoBuffer::MapData map(QVideoFrame::MapMode mode) override
{
MapData mapData;
if (m_mode == QVideoFrame::NotMapped) {
CVPixelBufferLockBaseAddress(
m_buffer, mode == QVideoFrame::ReadOnly ? kCVPixelBufferLock_ReadOnly : 0);
m_mode = mode;
}
mapData.nPlanes = CVPixelBufferGetPlaneCount(m_buffer);
Q_ASSERT(mapData.nPlanes <= 3);
if (!mapData.nPlanes) {
// single plane
mapData.bytesPerLine[0] = CVPixelBufferGetBytesPerRow(m_buffer);
mapData.data[0] = static_cast<uchar *>(CVPixelBufferGetBaseAddress(m_buffer));
mapData.size[0] = CVPixelBufferGetDataSize(m_buffer);
mapData.nPlanes = mapData.data[0] ? 1 : 0;
return mapData;
}
// For a bi-planar or tri-planar format we have to set the parameters correctly:
for (int i = 0; i < mapData.nPlanes; ++i) {
mapData.bytesPerLine[i] = CVPixelBufferGetBytesPerRowOfPlane(m_buffer, i);
mapData.size[i] = mapData.bytesPerLine[i] * CVPixelBufferGetHeightOfPlane(m_buffer, i);
mapData.data[i] = static_cast<uchar *>(CVPixelBufferGetBaseAddressOfPlane(m_buffer, i));
}
return mapData;
}
QVideoFrame::MapMode mapMode() const override { return m_mode; }
void unmap() override
{
if (m_mode != QVideoFrame::NotMapped) {
CVPixelBufferUnlockBaseAddress(
m_buffer, m_mode == QVideoFrame::ReadOnly ? kCVPixelBufferLock_ReadOnly : 0);
m_mode = QVideoFrame::NotMapped;
}
}
private:
CVImageBufferRef m_buffer;
QVideoFrame::MapMode m_mode = QVideoFrame::NotMapped;
};
}
// Make sure this is compatible with the layout used in ffmpeg's hwcontext_videotoolbox
static QFFmpeg::AVFrameUPtr allocHWFrame(AVBufferRef *hwContext, const CVPixelBufferRef &pixbuf)
{
AVHWFramesContext *ctx = (AVHWFramesContext *)hwContext->data;
auto frame = QFFmpeg::makeAVFrame();
frame->hw_frames_ctx = av_buffer_ref(hwContext);
frame->extended_data = frame->data;
frame->buf[0] = av_buffer_create((uint8_t *)pixbuf, 1, releaseHwFrame, NULL, 0);
frame->data[3] = (uint8_t *)pixbuf;
CVPixelBufferRetain(pixbuf);
frame->width = ctx->width;
frame->height = ctx->height;
frame->format = AV_PIX_FMT_VIDEOTOOLBOX;
if (frame->width != (int)CVPixelBufferGetWidth(pixbuf)
|| frame->height != (int)CVPixelBufferGetHeight(pixbuf)) {
// This can happen while changing camera format
return nullptr;
}
return frame;
}
@implementation QAVFSampleBufferDelegate {
@private
std::function<void(const QVideoFrame &)> frameHandler;
AVBufferRef *hwFramesContext;
std::unique_ptr<QFFmpeg::HWAccel> m_accel;
qint64 startTime;
std::optional<qint64> baseTime;
qreal frameRate;
}
static QVideoFrame createHwVideoFrame(QAVFSampleBufferDelegate &delegate,
CVImageBufferRef imageBuffer, QVideoFrameFormat format)
{
Q_ASSERT(delegate.baseTime);
if (!delegate.m_accel)
return {};
auto avFrame = allocHWFrame(delegate.m_accel->hwFramesContextAsBuffer(), imageBuffer);
if (!avFrame)
return {};
#ifdef USE_SW_FRAMES
{
auto swFrame = QFFmpeg::makeAVFrame();
/* retrieve data from GPU to CPU */
const int ret = av_hwframe_transfer_data(swFrame.get(), avFrame.get(), 0);
if (ret < 0) {
qWarning() << "Error transferring the data to system memory:" << ret;
} else {
avFrame = std::move(swFrame);
}
}
#endif
avFrame->pts = delegate.startTime - *delegate.baseTime;
return QVideoFrame(new QFFmpegVideoBuffer(std::move(avFrame)), format);
}
- (instancetype)initWithFrameHandler:(std::function<void(const QVideoFrame &)>)handler
{
if (!(self = [super init]))
return nil;
Q_ASSERT(handler);
frameHandler = std::move(handler);
hwFramesContext = nullptr;
startTime = 0;
frameRate = 0.;
return self;
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
{
Q_UNUSED(connection);
Q_UNUSED(captureOutput);
// NB: on iOS captureOutput/connection can be nil (when recording a video -
// avfmediaassetwriter).
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
if (!imageBuffer) {
qWarning() << "Cannot get image buffer from sample buffer";
return;
}
const CMTime time = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);
const qint64 frameTime = time.timescale ? time.value * 1000000 / time.timescale : 0;
if (!baseTime) {
baseTime = frameTime;
startTime = frameTime;
}
QVideoFrameFormat format = QAVFHelpers::videoFormatForImageBuffer(imageBuffer);
if (!format.isValid()) {
qWarning() << "Cannot get get video format for image buffer"
<< CVPixelBufferGetWidth(imageBuffer) << 'x'
<< CVPixelBufferGetHeight(imageBuffer);
return;
}
format.setStreamFrameRate(frameRate);
auto frame = createHwVideoFrame(*self, imageBuffer, format);
if (!frame.isValid())
frame = QVideoFrame(new CVImageVideoBuffer(imageBuffer), format);
frame.setStartTime(startTime - *baseTime);
frame.setEndTime(frameTime - *baseTime);
startTime = frameTime;
frameHandler(frame);
}
- (void)setHWAccel:(std::unique_ptr<QFFmpeg::HWAccel> &&)accel
{
m_accel = std::move(accel);
}
- (void)setVideoFormatFrameRate:(qreal)rate
{
frameRate = rate;
}
@end
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