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 "h264vaapiencoder_p.h"
 
 #include <QSize>
 
 extern "C" {
 #include <libavcodec/avcodec.h>
 #include <libavfilter/buffersink.h>
 #include <libavfilter/buffersrc.h>
 }
 
 #include "logging_record.h"
 
 H264VAAPIEncoder::H264VAAPIEncoder(H264Profile profile, PipeWireProduce *produce)
     : HardwareEncoder(produce)
     , m_profile(profile)
 {
 }
 
 bool H264VAAPIEncoder::initialize(const QSize &size)
 {
     if (!createDrmContext(size)) {
         return false;
     }
 
     m_avFilterGraph = avfilter_graph_alloc();
     if (!m_avFilterGraph) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "Could not create filter graph";
         return false;
     }
 
     int ret = avfilter_graph_create_filter(&m_inputFilter,
                                            avfilter_get_by_name("buffer"),
                                            "in",
                                            "width=1:height=1:pix_fmt=drm_prime:time_base=1/1",
                                            nullptr,
                                            m_avFilterGraph);
     if (ret < 0) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "Failed to create the buffer filter";
         return false;
     }
 
     auto parameters = av_buffersrc_parameters_alloc();
     if (!parameters) {
         qFatal("Failed to allocate memory");
     }
 
     parameters->format = AV_PIX_FMT_DRM_PRIME;
     parameters->width = size.width();
     parameters->height = size.height();
     parameters->time_base = {1, 1000};
     parameters->hw_frames_ctx = m_drmFramesContext;
 
     av_buffersrc_parameters_set(m_inputFilter, parameters);
     av_free(parameters);
     parameters = nullptr;
 
     ret = avfilter_graph_create_filter(&m_outputFilter, avfilter_get_by_name("buffersink"), "out", nullptr, nullptr, m_avFilterGraph);
     if (ret < 0) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "Could not create buffer output filter";
         return false;
     }
 
     auto inputs = avfilter_inout_alloc();
     if (!inputs) {
         qFatal("Failed to allocate memory");
     }
     inputs->name = av_strdup("in");
     inputs->filter_ctx = m_inputFilter;
     inputs->pad_idx = 0;
     inputs->next = nullptr;
 
     auto outputs = avfilter_inout_alloc();
     if (!outputs) {
         qFatal("Failed to allocate memory");
     }
     outputs->name = av_strdup("out");
     outputs->filter_ctx = m_outputFilter;
     outputs->pad_idx = 0;
     outputs->next = nullptr;
 
     ret = avfilter_graph_parse(m_avFilterGraph, "hwmap=mode=direct:derive_device=vaapi,scale_vaapi=format=nv12:mode=fast", outputs, inputs, NULL);
     if (ret < 0) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "Failed creating filter graph";
         return false;
     }
 
     for (auto i = 0u; i < m_avFilterGraph->nb_filters; ++i) {
         m_avFilterGraph->filters[i]->hw_device_ctx = av_buffer_ref(m_drmContext);
     }
 
     ret = avfilter_graph_config(m_avFilterGraph, nullptr);
     if (ret < 0) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "Failed configuring filter graph";
         return false;
     }
 
     auto codec = avcodec_find_encoder_by_name("h264_vaapi");
     if (!codec) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "h264_vaapi 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;
     }
 
     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_VAAPI;
     m_avCodecContext->time_base = AVRational{1, 1000};
 
     if (m_quality) {
         m_avCodecContext->global_quality = percentageToAbsoluteQuality(m_quality);
     } else {
         m_avCodecContext->global_quality = 35;
     }
 
     switch (m_profile) {
     case H264Profile::Baseline:
         m_avCodecContext->profile = FF_PROFILE_H264_CONSTRAINED_BASELINE;
         break;
     case H264Profile::Main:
         m_avCodecContext->profile = FF_PROFILE_H264_MAIN;
         break;
     case H264Profile::High:
         m_avCodecContext->profile = FF_PROFILE_H264_HIGH;
         break;
     }
 
     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);
 
     m_avCodecContext->hw_frames_ctx = av_buffer_ref(m_outputFilter->inputs[0]->hw_frames_ctx);
 
     if (int result = avcodec_open2(m_avCodecContext, codec, &options); result < 0) {
         qCWarning(PIPEWIRERECORD_LOGGING) << "Could not open codec" << av_err2str(ret);
         return false;
     }
 
     return true;
 }
 
 int H264VAAPIEncoder::percentageToAbsoluteQuality(const std::optional<quint8> &quality)
 {
     if (!quality) {
         return -1;
     }
 
     constexpr int MinQuality = 51 + 6 * 6;
     return std::max(1, int(MinQuality - (m_quality.value() / 100.0) * MinQuality));
 }