File indexing completed on 2024-05-05 05:30:17

 /*
     SPDX-FileCopyrightText: 2023 Aleix Pol Gonzalez <aleixpol@kde.org>
     SPDX-FileCopyrightText: 2023 Marco Martin <mart@kde.org>
     SPDX-FileCopyrightText: 2023 Arjen Hiemstra <ahiemstra@heimr.nl>
 
     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #include "libvpxencoder_p.h"
 
 #include <QSize>
 #include <QThread>
 
 extern "C" {
 #include <libavcodec/avcodec.h>
 #include <libavfilter/buffersink.h>
 #include <libavfilter/buffersrc.h>
 #include <libavutil/pixfmt.h>
 }
 
 #include "logging_record.h"
 
 LibVpxEncoder::LibVpxEncoder(PipeWireProduce *produce)
     : SoftwareEncoder(produce)
 {
 }
 
 bool LibVpxEncoder::initialize(const QSize &size)
 {
     createFilterGraph(size);
 
     auto codec = avcodec_find_encoder_by_name("libvpx");
     if (!codec) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "libvpx codec not found";
         return false;
     }
 
     m_avCodecContext = avcodec_alloc_context3(codec);
     if (!m_avCodecContext) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "Could not allocate video codec context";
         return false;
     }
     m_avCodecContext->bit_rate = size.width() * size.height() * 2;
 
     Q_ASSERT(!size.isEmpty());
     m_avCodecContext->width = size.width();
     m_avCodecContext->height = size.height();
     m_avCodecContext->max_b_frames = 0;
     m_avCodecContext->gop_size = 100;
     m_avCodecContext->pix_fmt = AV_PIX_FMT_YUV420P;
     m_avCodecContext->time_base = AVRational{1, 1000};
     m_avCodecContext->global_quality = 35;
 
     if (m_quality) {
         m_avCodecContext->global_quality = percentageToAbsoluteQuality(m_quality);
     } else {
         m_avCodecContext->global_quality = 35;
     }
 
     AVDictionary *options = nullptr;
     av_dict_set_int(&options, "threads", qMin(16, QThread::idealThreadCount()), 0);
     av_dict_set(&options, "preset", "veryfast", 0);
     av_dict_set(&options, "tune-content", "screen", 0);
     av_dict_set(&options, "deadline", "realtime", 0);
     // In theory a lower number should be faster, but the opposite seems to be true
     // av_dict_set(&options, "quality", "40", 0);
     // Disable motion estimation, not great while dragging windows but speeds up encoding by an order of magnitude
     av_dict_set(&options, "flags", "+mv4", 0);
     // Disable in-loop filtering
     av_dict_set(&options, "-flags", "+loop", 0);
     av_dict_set(&options, "crf", "45", 0);
 
     if (int result = avcodec_open2(m_avCodecContext, codec, &options); result < 0) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "Could not open codec" << av_err2str(result);
         return false;
     }
 
     return true;
 }
 
 int LibVpxEncoder::percentageToAbsoluteQuality(const std::optional<quint8> &quality)
 {
     if (!quality) {
         return -1;
     }
 
     constexpr int MinQuality = 63;
     return std::max(1, int(MinQuality - (m_quality.value() / 100.0) * MinQuality));
 }