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// Copyright (C) 2024 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 "qffmpegvideoencoder_p.h"
#include "qffmpegmuxer_p.h"
#include "qffmpegvideobuffer_p.h"
#include "qffmpegrecordingengine_p.h"
#include "qffmpegvideoframeencoder_p.h"
#include <QtCore/qloggingcategory.h>
QT_BEGIN_NAMESPACE
namespace QFFmpeg {
static Q_LOGGING_CATEGORY(qLcFFmpegVideoEncoder, "qt.multimedia.ffmpeg.videoencoder");
VideoEncoder::VideoEncoder(RecordingEngine &recordingEngine, const QMediaEncoderSettings &settings,
const QVideoFrameFormat &format, std::optional<AVPixelFormat> hwFormat)
: EncoderThread(recordingEngine)
{
setObjectName(QLatin1String("VideoEncoder"));
AVPixelFormat swFormat = QFFmpegVideoBuffer::toAVPixelFormat(format.pixelFormat());
AVPixelFormat ffmpegPixelFormat =
hwFormat && *hwFormat != AV_PIX_FMT_NONE ? *hwFormat : swFormat;
auto frameRate = format.streamFrameRate();
if (frameRate <= 0.) {
qWarning() << "Invalid frameRate" << frameRate << "; Using the default instead";
// set some default frame rate since ffmpeg has UB if it's 0.
frameRate = 30.;
}
m_frameEncoder = VideoFrameEncoder::create(settings,
format.frameSize(),
format.rotation(),
frameRate,
ffmpegPixelFormat,
swFormat,
recordingEngine.avFormatContext());
}
VideoEncoder::~VideoEncoder() = default;
bool VideoEncoder::isValid() const
{
return m_frameEncoder != nullptr;
}
void VideoEncoder::addFrame(const QVideoFrame &frame)
{
QMutexLocker locker = lockLoopData();
// Drop frames if encoder can not keep up with the video source data rate
const bool queueFull = m_videoFrameQueue.size() >= m_maxQueueSize;
if (queueFull) {
qCDebug(qLcFFmpegVideoEncoder) << "RecordingEngine frame queue full. Frame lost.";
} else if (!m_paused.loadRelaxed()) {
m_videoFrameQueue.push(frame);
locker.unlock(); // Avoid context switch on wake wake-up
dataReady();
}
}
QVideoFrame VideoEncoder::takeFrame()
{
QMutexLocker locker = lockLoopData();
return dequeueIfPossible(m_videoFrameQueue);
}
void VideoEncoder::retrievePackets()
{
if (!m_frameEncoder)
return;
while (auto packet = m_frameEncoder->retrievePacket())
m_recordingEngine.getMuxer()->addPacket(std::move(packet));
}
void VideoEncoder::init()
{
qCDebug(qLcFFmpegVideoEncoder) << "VideoEncoder::init started video device thread.";
bool ok = m_frameEncoder->open();
if (!ok)
emit m_recordingEngine.error(QMediaRecorder::ResourceError, "Could not initialize encoder");
}
void VideoEncoder::cleanup()
{
while (!m_videoFrameQueue.empty())
processOne();
if (m_frameEncoder) {
while (m_frameEncoder->sendFrame(nullptr) == AVERROR(EAGAIN))
retrievePackets();
retrievePackets();
}
}
bool VideoEncoder::hasData() const
{
return !m_videoFrameQueue.empty();
}
struct QVideoFrameHolder
{
QVideoFrame f;
QImage i;
};
static void freeQVideoFrame(void *opaque, uint8_t *)
{
delete reinterpret_cast<QVideoFrameHolder *>(opaque);
}
void VideoEncoder::processOne()
{
retrievePackets();
auto frame = takeFrame();
if (!frame.isValid())
return;
if (!isValid())
return;
// qCDebug(qLcFFmpegEncoder) << "new video buffer" << frame.startTime();
AVFrameUPtr avFrame;
auto *videoBuffer = dynamic_cast<QFFmpegVideoBuffer *>(frame.videoBuffer());
if (videoBuffer) {
// ffmpeg video buffer, let's use the native AVFrame stored in there
auto *hwFrame = videoBuffer->getHWFrame();
if (hwFrame && hwFrame->format == m_frameEncoder->sourceFormat())
avFrame.reset(av_frame_clone(hwFrame));
}
if (!avFrame) {
frame.map(QVideoFrame::ReadOnly);
auto size = frame.size();
avFrame = makeAVFrame();
avFrame->format = m_frameEncoder->sourceFormat();
avFrame->width = size.width();
avFrame->height = size.height();
for (int i = 0; i < 4; ++i) {
avFrame->data[i] = const_cast<uint8_t *>(frame.bits(i));
avFrame->linesize[i] = frame.bytesPerLine(i);
}
QImage img;
if (frame.pixelFormat() == QVideoFrameFormat::Format_Jpeg) {
// the QImage is cached inside the video frame, so we can take the pointer to the image
// data here
img = frame.toImage();
avFrame->data[0] = (uint8_t *)img.bits();
avFrame->linesize[0] = img.bytesPerLine();
}
Q_ASSERT(avFrame->data[0]);
// ensure the video frame and it's data is alive as long as it's being used in the encoder
avFrame->opaque_ref = av_buffer_create(nullptr, 0, freeQVideoFrame,
new QVideoFrameHolder{ frame, img }, 0);
}
if (m_baseTime.loadAcquire() == std::numeric_limits<qint64>::min()) {
m_baseTime.storeRelease(frame.startTime() - m_lastFrameTime);
qCDebug(qLcFFmpegVideoEncoder) << ">>>> adjusting base time to" << m_baseTime.loadAcquire()
<< frame.startTime() << m_lastFrameTime;
}
qint64 time = frame.startTime() - m_baseTime.loadAcquire();
m_lastFrameTime = frame.endTime() - m_baseTime.loadAcquire();
setAVFrameTime(*avFrame, m_frameEncoder->getPts(time), m_frameEncoder->getTimeBase());
m_recordingEngine.newTimeStamp(time / 1000);
qCDebug(qLcFFmpegVideoEncoder)
<< ">>> sending frame" << avFrame->pts << time << m_lastFrameTime;
int ret = m_frameEncoder->sendFrame(std::move(avFrame));
if (ret < 0) {
qCDebug(qLcFFmpegVideoEncoder) << "error sending frame" << ret << err2str(ret);
emit m_recordingEngine.error(QMediaRecorder::ResourceError, err2str(ret));
}
}
} // namespace QFFmpeg
QT_END_NAMESPACE
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