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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 "qffmpegrecordingengineutils_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)
{
if (!frame.isValid()) // TODO: report endOfStream
return;
{
auto guard = lockLoopData();
if (m_paused) {
m_shouldAdjustTimeBaseForNextFrame = true;
return;
}
// Drop frames if encoder can not keep up with the video source data rate;
// canPushFrame might be used instead
const bool queueFull = m_videoFrameQueue.size() >= m_maxQueueSize;
if (queueFull) {
qCDebug(qLcFFmpegVideoEncoder) << "RecordingEngine frame queue full. Frame lost.";
return;
}
m_videoFrameQueue.push({ frame, m_shouldAdjustTimeBaseForNextFrame });
m_shouldAdjustTimeBaseForNextFrame = false;
}
dataReady();
}
VideoEncoder::FrameInfo VideoEncoder::takeFrame()
{
auto guard = 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()
{
Q_ASSERT(isValid());
qCDebug(qLcFFmpegVideoEncoder) << "VideoEncoder::init started video device thread.";
bool ok = m_frameEncoder->open();
if (!ok)
emit m_recordingEngine.sessionError(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();
FrameInfo frameInfo = takeFrame();
QVideoFrame &frame = frameInfo.frame;
Q_ASSERT(frame.isValid());
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);
}
const auto [startTime, endTime] = frameTimeStamps(frame);
if (frameInfo.shouldAdjustTimeBase) {
m_baseTime += startTime - m_lastFrameTime;
qCDebug(qLcFFmpegVideoEncoder)
<< ">>>> adjusting base time to" << m_baseTime << startTime << m_lastFrameTime;
}
const qint64 time = startTime - m_baseTime;
m_lastFrameTime = endTime;
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.sessionError(QMediaRecorder::ResourceError, err2str(ret));
}
}
bool VideoEncoder::checkIfCanPushFrame() const
{
if (isRunning())
return m_videoFrameQueue.size() < m_maxQueueSize;
if (!isFinished())
return m_videoFrameQueue.empty();
return false;
}
std::pair<qint64, qint64> VideoEncoder::frameTimeStamps(const QVideoFrame &frame) const
{
qint64 startTime = frame.startTime();
qint64 endTime = frame.endTime();
if (startTime == -1) {
startTime = m_lastFrameTime;
endTime = -1;
}
if (endTime == -1) {
qreal frameRate = frame.streamFrameRate();
if (frameRate <= 0.)
frameRate = m_frameEncoder->settings().videoFrameRate();
Q_ASSERT(frameRate > 0.f);
endTime = startTime + static_cast<qint64>(std::round(VideoFrameTimeBase / frameRate));
}
return { startTime, endTime };
}
} // namespace QFFmpeg
QT_END_NAMESPACE
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