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// Copyright (C) 2021 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 "playbackengine/qffmpegstreamdecoder_p.h"
#include "playbackengine/qffmpegmediadataholder_p.h"
QT_BEGIN_NAMESPACE
namespace QFFmpeg::PlaybackEngineInternal {
StreamDecoder::StreamDecoder(const Codec &codec, qint64 seekPos)
: m_codec(codec),
m_seekPos(seekPos),
m_trackType(MediaDataHolder::trackTypeFromMediaType(codec.context()->codec_type))
{
Q_ASSERT(m_trackType != QPlatformMediaPlayer::NTrackTypes);
}
StreamDecoder::~StreamDecoder()
{
avcodec_flush_buffers(m_codec.context());
}
void StreamDecoder::onFinalPacketReceived()
{
decode({});
}
void StreamDecoder::decode(Packet packet)
{
m_packets.enqueue(packet);
scheduleNextStep();
}
void StreamDecoder::doNextStep()
{
auto packet = m_packets.dequeue();
if (trackType() == QPlatformMediaPlayer::SubtitleStream)
decodeSubtitle(packet);
else
decodeMedia(packet);
setAtEnd(!packet.isValid());
if (packet.isValid())
emit packetProcessed(packet);
scheduleNextStep(false);
}
QPlatformMediaPlayer::TrackType StreamDecoder::trackType() const
{
return m_trackType;
}
void StreamDecoder::onFrameProcessed(Frame frame)
{
if (frame.source() != this)
return;
--m_pendingFramesCount;
Q_ASSERT(m_pendingFramesCount >= 0);
scheduleNextStep();
}
bool StreamDecoder::canDoNextStep() const
{
constexpr qint32 maxPendingFramesCount = 3;
constexpr qint32 maxPendingAudioFramesCount = 9;
const auto maxCount = m_trackType == QPlatformMediaPlayer::AudioStream
? maxPendingAudioFramesCount
: m_trackType == QPlatformMediaPlayer::SubtitleStream
? maxPendingFramesCount * 2 /*main packet and closing packet*/
: maxPendingFramesCount;
return !m_packets.empty() && m_pendingFramesCount < maxCount
&& PlaybackEngineObject::canDoNextStep();
}
void StreamDecoder::onFrameFound(Frame frame)
{
if (frame.isValid() && frame.end() < m_seekPos)
return;
Q_ASSERT(m_pendingFramesCount >= 0);
++m_pendingFramesCount;
emit requestHandleFrame(frame);
}
void StreamDecoder::decodeMedia(Packet packet)
{
auto sendPacketResult = sendAVPacket(packet);
if (sendPacketResult == AVERROR(EAGAIN)) {
// Doc says:
// AVERROR(EAGAIN): input is not accepted in the current state - user
// must read output with avcodec_receive_frame() (once
// all output is read, the packet should be resent, and
// the call will not fail with EAGAIN).
receiveAVFrames();
sendPacketResult = sendAVPacket(packet);
if (sendPacketResult != AVERROR(EAGAIN))
qWarning() << "Unexpected ffmpeg behavior";
}
if (sendPacketResult == 0)
receiveAVFrames();
}
int StreamDecoder::sendAVPacket(Packet packet)
{
return avcodec_send_packet(m_codec.context(), packet.isValid() ? packet.avPacket() : nullptr);
}
void StreamDecoder::receiveAVFrames()
{
while (true) {
auto avFrame = makeAVFrame();
const auto receiveFrameResult = avcodec_receive_frame(m_codec.context(), avFrame.get());
if (receiveFrameResult == AVERROR_EOF || receiveFrameResult == AVERROR(EAGAIN))
break;
if (receiveFrameResult < 0) {
emit error(QMediaPlayer::FormatError, err2str(receiveFrameResult));
break;
}
onFrameFound({ std::move(avFrame), m_codec, 0, this });
}
}
void StreamDecoder::decodeSubtitle(Packet packet)
{
if (!packet.isValid())
return;
// qCDebug(qLcDecoder) << " decoding subtitle" << "has delay:" <<
// (codec->codec->capabilities & AV_CODEC_CAP_DELAY);
AVSubtitle subtitle;
memset(&subtitle, 0, sizeof(subtitle));
int gotSubtitle = 0;
const int res =
avcodec_decode_subtitle2(m_codec.context(), &subtitle, &gotSubtitle, packet.avPacket());
// qCDebug(qLcDecoder) << " subtitle got:" << res << gotSubtitle << subtitle.format <<
// Qt::hex << (quint64)subtitle.pts;
if (res < 0 || !gotSubtitle)
return;
// apparently the timestamps in the AVSubtitle structure are not always filled in
// if they are missing, use the packets pts and duration values instead
qint64 start, end;
if (subtitle.pts == AV_NOPTS_VALUE) {
start = m_codec.toUs(packet.avPacket()->pts);
end = start + m_codec.toUs(packet.avPacket()->duration);
} else {
auto pts = timeStampUs(subtitle.pts, AVRational{ 1, AV_TIME_BASE });
start = *pts + qint64(subtitle.start_display_time) * 1000;
end = *pts + qint64(subtitle.end_display_time) * 1000;
}
if (end <= start) {
qWarning() << "Invalid subtitle time";
return;
}
// qCDebug(qLcDecoder) << " got subtitle (" << start << "--" << end << "):";
QString text;
for (uint i = 0; i < subtitle.num_rects; ++i) {
const auto *r = subtitle.rects[i];
// qCDebug(qLcDecoder) << " subtitletext:" << r->text << "/" << r->ass;
if (i)
text += QLatin1Char('\n');
if (r->text)
text += QString::fromUtf8(r->text);
else {
const char *ass = r->ass;
int nCommas = 0;
while (*ass) {
if (nCommas == 8)
break;
if (*ass == ',')
++nCommas;
++ass;
}
text += QString::fromUtf8(ass);
}
}
text.replace(QLatin1String("\\N"), QLatin1String("\n"));
text.replace(QLatin1String("\\n"), QLatin1String("\n"));
text.replace(QLatin1String("\r\n"), QLatin1String("\n"));
if (text.endsWith(QLatin1Char('\n')))
text.chop(1);
onFrameFound({ text, start, end - start, this });
// TODO: maybe optimize
onFrameFound({ QString(), end, 0, this });
}
}
QT_END_NAMESPACE
#include "moc_qffmpegstreamdecoder_p.cpp"
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