#include "drm.h"

extern "C" {
    #include <libavutil/hwcontext_drm.h>
}

#include <libdrm/drm_fourcc.h>

// Special Rockchip type
#ifndef DRM_FORMAT_NV12_10
#define DRM_FORMAT_NV12_10 fourcc_code('N', 'A', '1', '2')
#endif

// Special Raspberry Pi type (upstreamed)
#ifndef DRM_FORMAT_P030
#define DRM_FORMAT_P030	fourcc_code('P', '0', '3', '0')
#endif

// Regular P010 (not present in some old libdrm headers)
#ifndef DRM_FORMAT_P010
#define DRM_FORMAT_P010	fourcc_code('P', '0', '1', '0')
#endif

#include <unistd.h>
#include <fcntl.h>

#include "streaming/streamutils.h"
#include "streaming/session.h"

#include <Limelight.h>

#include <SDL_syswm.h>

DrmRenderer::DrmRenderer(IFFmpegRenderer *backendRenderer)
    : m_BackendRenderer(backendRenderer),
      m_HwContext(nullptr),
      m_DrmFd(-1),
      m_SdlOwnsDrmFd(false),
      m_SupportsDirectRendering(false),
      m_Main10Hdr(false),
      m_ConnectorId(0),
      m_EncoderId(0),
      m_CrtcId(0),
      m_PlaneId(0),
      m_CurrentFbId(0),
      m_LastColorRange(AVCOL_RANGE_UNSPECIFIED),
      m_LastColorSpace(AVCOL_SPC_UNSPECIFIED),
      m_ColorEncodingProp(nullptr),
      m_ColorRangeProp(nullptr),
      m_HdrOutputMetadataProp(nullptr),
      m_HdrOutputMetadataBlobId(0)
{
#ifdef HAVE_EGL
    m_EGLExtDmaBuf = false;
    m_eglCreateImage = nullptr;
    m_eglCreateImageKHR = nullptr;
    m_eglDestroyImage = nullptr;
    m_eglDestroyImageKHR = nullptr;
#endif
}

DrmRenderer::~DrmRenderer()
{
    // Ensure we're out of HDR mode
    setHdrMode(false);

    if (m_CurrentFbId != 0) {
        drmModeRmFB(m_DrmFd, m_CurrentFbId);
    }

    if (m_HdrOutputMetadataBlobId != 0) {
        drmModeDestroyPropertyBlob(m_DrmFd, m_HdrOutputMetadataBlobId);
    }

    if (m_ColorEncodingProp != nullptr) {
        drmModeFreeProperty(m_ColorEncodingProp);
    }

    if (m_ColorRangeProp != nullptr) {
        drmModeFreeProperty(m_ColorRangeProp);
    }

    if (m_HdrOutputMetadataProp != nullptr) {
        drmModeFreeProperty(m_HdrOutputMetadataProp);
    }

    if (m_HwContext != nullptr) {
        av_buffer_unref(&m_HwContext);
    }

    if (!m_SdlOwnsDrmFd && m_DrmFd != -1) {
        close(m_DrmFd);
    }
}

bool DrmRenderer::prepareDecoderContext(AVCodecContext* context, AVDictionary** options)
{
    // The out-of-tree LibreELEC patches use this option to control the type of the V4L2
    // buffers that we get back. We only support NV12 buffers now.
    av_dict_set_int(options, "pixel_format", AV_PIX_FMT_NV12, 0);

    context->hw_device_ctx = av_buffer_ref(m_HwContext);

    SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                "Using DRM renderer");

    return true;
}

bool DrmRenderer::initialize(PDECODER_PARAMETERS params)
{
    int i;

    m_Main10Hdr = (params->videoFormat == VIDEO_FORMAT_H265_MAIN10);

#if SDL_VERSION_ATLEAST(2, 0, 15)
    SDL_SysWMinfo info;

    SDL_VERSION(&info.version);

    if (!SDL_GetWindowWMInfo(params->window, &info)) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "SDL_GetWindowWMInfo() failed: %s",
                     SDL_GetError());
        return false;
    }

    if (info.subsystem == SDL_SYSWM_KMSDRM) {
        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                    "Sharing DRM FD with SDL");

        SDL_assert(info.info.kmsdrm.drm_fd >= 0);
        m_DrmFd = info.info.kmsdrm.drm_fd;
        m_SdlOwnsDrmFd = true;
    }
    else
#endif
    {
        const char* userDevice = SDL_getenv("DRM_DEV");
        if (userDevice != nullptr) {
            SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                        "Opening user-specified DRM device: %s",
                        userDevice);

            m_DrmFd = open(userDevice, O_RDWR | O_CLOEXEC);
        }
        else {
            const char* defaultDevices[] = {"/dev/dri/renderD128", "/dev/dri/card0"};

            for (unsigned int i = 0; i < SDL_arraysize(defaultDevices); i++) {
                m_DrmFd = open(defaultDevices[i], O_RDWR | O_CLOEXEC);
                if (m_DrmFd >= 0) {
                    SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                                "Opened DRM device: %s",
                                defaultDevices[i]);
                    break;
                }
            }
        }

        if (m_DrmFd < 0) {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                         "Failed to open DRM device: %d",
                          errno);
            return false;
        }
    }

    // Create the device context first because it is needed whether we can
    // actually use direct rendering or not.
    m_HwContext = av_hwdevice_ctx_alloc(AV_HWDEVICE_TYPE_DRM);
    if (m_HwContext == nullptr) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "av_hwdevice_ctx_alloc(DRM) failed");
        return false;
    }

    AVHWDeviceContext* deviceContext = (AVHWDeviceContext*)m_HwContext->data;
    AVDRMDeviceContext* drmDeviceContext = (AVDRMDeviceContext*)deviceContext->hwctx;

    drmDeviceContext->fd = m_DrmFd;

    int err = av_hwdevice_ctx_init(m_HwContext);
    if (err < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "av_hwdevice_ctx_init(DRM) failed: %d",
                     err);
        return false;
    }

    // Still return true if we fail to initialize DRM direct rendering
    // stuff, since we have EGLRenderer and SDLRenderer that we can use
    // for indirect rendering. Our FFmpeg renderer selection code will
    // handle the case where those also fail to render the test frame.
    // If we are just acting as a frontend renderer (m_BackendRenderer
    // == nullptr), we want to fail if we can't render directly since
    // that's the whole point it's trying to use us for.
    const bool DIRECT_RENDERING_INIT_FAILED = (m_BackendRenderer == nullptr);

    // If we're not sharing the DRM FD with SDL, that means we don't
    // have DRM master, so we can't call drmModeSetPlane(). We can
    // use EGLRenderer or SDLRenderer to render in this situation.
    if (!m_SdlOwnsDrmFd) {
        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                    "Direct rendering via DRM is disabled");
        return DIRECT_RENDERING_INIT_FAILED;
    }

    drmModeRes* resources = drmModeGetResources(m_DrmFd);
    if (resources == nullptr) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "drmModeGetResources() failed: %d",
                     errno);
        return DIRECT_RENDERING_INIT_FAILED;
    }

    // Look for a connected connector and get the associated encoder
    m_ConnectorId = 0;
    m_EncoderId = 0;
    for (i = 0; i < resources->count_connectors && m_EncoderId == 0; i++) {
        drmModeConnector* connector = drmModeGetConnector(m_DrmFd, resources->connectors[i]);
        if (connector != nullptr) {
            if (connector->connection == DRM_MODE_CONNECTED && connector->count_modes > 0) {
                m_ConnectorId = resources->connectors[i];
                m_EncoderId = connector->encoder_id;
            }

            drmModeFreeConnector(connector);
        }
    }

    if (m_EncoderId == 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "No connected displays found!");
        drmModeFreeResources(resources);
        return DIRECT_RENDERING_INIT_FAILED;
    }

    // Now find the CRTC from the encoder
    m_CrtcId = 0;
    for (i = 0; i < resources->count_encoders && m_CrtcId == 0; i++) {
        drmModeEncoder* encoder = drmModeGetEncoder(m_DrmFd, resources->encoders[i]);
        if (encoder != nullptr) {
            if (encoder->encoder_id == m_EncoderId) {
                m_CrtcId = encoder->crtc_id;
            }

            drmModeFreeEncoder(encoder);
        }
    }

    if (m_CrtcId == 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "DRM encoder not found!");
        drmModeFreeResources(resources);
        return DIRECT_RENDERING_INIT_FAILED;
    }

    int crtcIndex = -1;
    for (int i = 0; i < resources->count_crtcs; i++) {
        if (resources->crtcs[i] == m_CrtcId) {
            drmModeCrtc* crtc = drmModeGetCrtc(m_DrmFd, resources->crtcs[i]);
            crtcIndex = i;
            m_OutputRect.x = m_OutputRect.y = 0;
            m_OutputRect.w = crtc->width;
            m_OutputRect.h = crtc->height;
            drmModeFreeCrtc(crtc);
            break;
        }
    }

    drmModeFreeResources(resources);

    if (crtcIndex == -1) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "Failed to get CRTC!");
        return DIRECT_RENDERING_INIT_FAILED;
    }

    drmSetClientCap(m_DrmFd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);

    drmModePlaneRes* planeRes = drmModeGetPlaneResources(m_DrmFd);
    if (planeRes == nullptr) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "drmGetPlaneResources() failed: %d",
                     errno);
        return DIRECT_RENDERING_INIT_FAILED;
    }

    // Find an overlay plane with the required format to render on
    //
    // FIXME: We should check the actual DRM format in a real AVFrame rather
    // than just assuming it will be a certain hardcoded type like NV12 based
    // on the chosen video format.
    m_PlaneId = 0;
    for (uint32_t i = 0; i < planeRes->count_planes && m_PlaneId == 0; i++) {
        drmModePlane* plane = drmModeGetPlane(m_DrmFd, planeRes->planes[i]);
        if (plane != nullptr) {
            bool matchingFormat = false;
            for (uint32_t j = 0; j < plane->count_formats && !matchingFormat; j++) {
                if (m_Main10Hdr) {
                    switch (plane->formats[j]) {
                    case DRM_FORMAT_P010:
                    case DRM_FORMAT_P030:
                    case DRM_FORMAT_NV12_10:
                        matchingFormat = true;
                        break;
                    }
                }
                else {
                    switch (plane->formats[j]) {
                    case DRM_FORMAT_NV12:
                        matchingFormat = true;
                        break;
                    }
                }
            }

            if (matchingFormat == false) {
                drmModeFreePlane(plane);
                continue;
            }

            if ((plane->possible_crtcs & (1 << crtcIndex)) && plane->crtc_id == 0) {
                drmModeObjectPropertiesPtr props = drmModeObjectGetProperties(m_DrmFd, planeRes->planes[i], DRM_MODE_OBJECT_PLANE);
                if (props != nullptr) {
                    for (uint32_t j = 0; j < props->count_props; j++) {
                        drmModePropertyPtr prop = drmModeGetProperty(m_DrmFd, props->props[j]);
                        if (prop != nullptr) {
                            if (!strcmp(prop->name, "type") && props->prop_values[j] == DRM_PLANE_TYPE_OVERLAY) {
                                m_PlaneId = plane->plane_id;
                            }

                            if (!strcmp(prop->name, "COLOR_ENCODING")) {
                                m_ColorEncodingProp = prop;
                            }
                            else if (!strcmp(prop->name, "COLOR_RANGE")) {
                                m_ColorRangeProp = prop;
                            }
                            else {
                                drmModeFreeProperty(prop);
                            }
                        }
                    }

                    drmModeFreeObjectProperties(props);
                }
            }

            drmModeFreePlane(plane);
        }
    }

    drmModeFreePlaneResources(planeRes);

    if (m_PlaneId == 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "Failed to find suitable overlay plane!");
        return DIRECT_RENDERING_INIT_FAILED;
    }

    drmModeObjectPropertiesPtr props = drmModeObjectGetProperties(m_DrmFd, m_ConnectorId, DRM_MODE_OBJECT_CONNECTOR);
    if (props != nullptr) {
        for (uint32_t j = 0; j < props->count_props; j++) {
            drmModePropertyPtr prop = drmModeGetProperty(m_DrmFd, props->props[j]);
            if (prop != nullptr) {
                if (!strcmp(prop->name, "HDR_OUTPUT_METADATA")) {
                    m_HdrOutputMetadataProp = prop;
                }
                else {
                    drmModeFreeProperty(prop);
                }
            }
        }

        drmModeFreeObjectProperties(props);
    }

    // If we have an HDR output metadata property, construct the metadata blob
    // to apply when we are called to enter HDR mode.
    if (m_HdrOutputMetadataProp != nullptr) {
        DrmDefs::hdr_output_metadata outputMetadata;

        outputMetadata.metadata_type = 0; // HDMI_STATIC_METADATA_TYPE1
        outputMetadata.hdmi_metadata_type1.eotf = params->hdrMetadata.eotf;
        outputMetadata.hdmi_metadata_type1.metadata_type = params->hdrMetadata.staticMetadataDescriptorId;
        for (int i = 0; i < 3; i++) {
            outputMetadata.hdmi_metadata_type1.display_primaries[i].x = params->hdrMetadata.displayPrimaries[i].x;
            outputMetadata.hdmi_metadata_type1.display_primaries[i].y = params->hdrMetadata.displayPrimaries[i].y;
        }
        outputMetadata.hdmi_metadata_type1.white_point.x = params->hdrMetadata.whitePoint.x;
        outputMetadata.hdmi_metadata_type1.white_point.y = params->hdrMetadata.whitePoint.y;
        outputMetadata.hdmi_metadata_type1.max_display_mastering_luminance = params->hdrMetadata.maxDisplayMasteringLuminance;
        outputMetadata.hdmi_metadata_type1.min_display_mastering_luminance = params->hdrMetadata.minDisplayMasteringLuminance;
        outputMetadata.hdmi_metadata_type1.max_cll = params->hdrMetadata.maxContentLightLevel;
        outputMetadata.hdmi_metadata_type1.max_fall = params->hdrMetadata.maxFrameAverageLightLevel;

        err = drmModeCreatePropertyBlob(m_DrmFd, &outputMetadata, sizeof(outputMetadata), &m_HdrOutputMetadataBlobId);
        if (err < 0) {
            m_HdrOutputMetadataBlobId = 0;
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                         "drmModeCreatePropertyBlob() failed: %d",
                         errno);
            // Non-fatal
        }
    }

    // If we got this far, we can do direct rendering via the DRM FD.
    m_SupportsDirectRendering = true;

    return true;
}

enum AVPixelFormat DrmRenderer::getPreferredPixelFormat(int videoFormat)
{
    // DRM PRIME buffers, or whatever the backend renderer wants
    if (m_BackendRenderer != nullptr) {
        return m_BackendRenderer->getPreferredPixelFormat(videoFormat);
    }
    else {
        return AV_PIX_FMT_DRM_PRIME;
    }
}

bool DrmRenderer::isPixelFormatSupported(int videoFormat, AVPixelFormat pixelFormat) {
    // Pass through the backend renderer if we have one. Otherwise we use
    // the default behavior which only supports the preferred format.
    if (m_BackendRenderer != nullptr) {
        return m_BackendRenderer->isPixelFormatSupported(videoFormat, pixelFormat);
    }
    else {
        return getPreferredPixelFormat(videoFormat);
    }
}

int DrmRenderer::getRendererAttributes()
{
    int attributes = 0;

    // This renderer can only draw in full-screen
    attributes |= RENDERER_ATTRIBUTE_FULLSCREEN_ONLY;

    // This renderer supports HDR
    attributes |= RENDERER_ATTRIBUTE_HDR_SUPPORT;

    return attributes;
}

void DrmRenderer::setHdrMode(bool enabled)
{
    if (m_HdrOutputMetadataProp != nullptr && m_HdrOutputMetadataBlobId != 0) {
        int err = drmModeObjectSetProperty(m_DrmFd, m_ConnectorId, DRM_MODE_OBJECT_CONNECTOR,
                                           m_HdrOutputMetadataProp->prop_id,
                                           enabled ? m_HdrOutputMetadataBlobId : 0);
        if (err == 0) {
            SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                        "Set display HDR mode: %s", enabled ? "enabled" : "disabled");
        }
        else {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                         "drmModeObjectSetProperty(%s) failed: %d",
                         m_HdrOutputMetadataProp->name,
                         errno);
            // Non-fatal
        }
    }
    else if (enabled) {
        SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                    "HDR_OUTPUT_METADATA is unavailable on this display. Unable to enter HDR mode!");
    }
}

void DrmRenderer::renderFrame(AVFrame* frame)
{
    AVDRMFrameDescriptor mappedFrame;
    AVDRMFrameDescriptor* drmFrame;

    if (frame == nullptr) {
        // End of stream - nothing to do for us
        return;
    }

    // If we are acting as the frontend renderer, we'll need to have the backend
    // map this frame into a DRM PRIME descriptor that we can render.
    if (m_BackendRenderer != nullptr) {
        if (!m_BackendRenderer->mapDrmPrimeFrame(frame, &mappedFrame)) {
            return;
        }

        drmFrame = &mappedFrame;
    }
    else {
        // If we're the backend renderer, the frame should already have it.
        SDL_assert(frame->format == AV_PIX_FMT_DRM_PRIME);
        drmFrame = (AVDRMFrameDescriptor*)frame->data[0];
    }

    int err;
    uint32_t handles[4] = {};
    uint32_t pitches[4] = {};
    uint32_t offsets[4] = {};
    uint64_t modifiers[4] = {};
    uint32_t flags = 0;

    SDL_Rect src, dst;

    src.x = src.y = 0;
    src.w = frame->width;
    src.h = frame->height;
    dst = m_OutputRect;

    StreamUtils::scaleSourceToDestinationSurface(&src, &dst);

    // DRM requires composed layers rather than separate layers per plane
    SDL_assert(drmFrame->nb_layers == 1);

    const auto &layer = drmFrame->layers[0];
    for (int i = 0; i < layer.nb_planes; i++) {
        const auto &object = drmFrame->objects[layer.planes[i].object_index];

        err = drmPrimeFDToHandle(m_DrmFd, object.fd, &handles[i]);
        if (err < 0) {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                         "drmPrimeFDToHandle() failed: %d",
                         errno);
            if (m_BackendRenderer != nullptr) {
                SDL_assert(drmFrame == &mappedFrame);
                m_BackendRenderer->unmapDrmPrimeFrame(drmFrame);
            }
            return;
        }

        pitches[i] = layer.planes[i].pitch;
        offsets[i] = layer.planes[i].offset;
        modifiers[i] = object.format_modifier;

        // Pass along the modifiers to DRM if there are some in the descriptor
        if (modifiers[i] != DRM_FORMAT_MOD_INVALID) {
            flags |= DRM_MODE_FB_MODIFIERS;
        }
    }

    // Remember the last FB object we created so we can free it
    // when we are finished rendering this one (if successful).
    uint32_t lastFbId = m_CurrentFbId;

    // Create a frame buffer object from the PRIME buffer
    // NB: It is an error to pass modifiers without DRM_MODE_FB_MODIFIERS set.
    err = drmModeAddFB2WithModifiers(m_DrmFd, frame->width, frame->height,
                                     drmFrame->layers[0].format,
                                     handles, pitches, offsets,
                                     (flags & DRM_MODE_FB_MODIFIERS) ? modifiers : NULL,
                                     &m_CurrentFbId, flags);

    if (m_BackendRenderer != nullptr) {
        SDL_assert(drmFrame == &mappedFrame);
        m_BackendRenderer->unmapDrmPrimeFrame(drmFrame);
    }

    if (err < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "drmModeAddFB2WithModifiers() failed: %d",
                     errno);
        m_CurrentFbId = lastFbId;
        return;
    }

    if (frame->color_range != m_LastColorRange) {
        const char* desiredValue = getDrmColorRangeValue(frame);

        if (m_ColorRangeProp != nullptr && desiredValue != nullptr) {
            int i;

            for (i = 0; i < m_ColorRangeProp->count_enums; i++) {
                if (!strcmp(desiredValue, m_ColorRangeProp->enums[i].name)) {
                    err = drmModeObjectSetProperty(m_DrmFd, m_PlaneId, DRM_MODE_OBJECT_PLANE,
                                                   m_ColorRangeProp->prop_id, m_ColorRangeProp->enums[i].value);
                    if (err == 0) {
                        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                                    "%s: %s",
                                    m_ColorRangeProp->name,
                                    desiredValue);
                    }
                    else {
                        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                                     "drmModeObjectSetProperty(%s) failed: %d",
                                     m_ColorRangeProp->name,
                                     errno);
                        // Non-fatal
                    }

                    break;
                }
            }

            if (i == m_ColorRangeProp->count_enums) {
                SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                            "Unable to find matching COLOR_RANGE value for '%s'. Colors may be inaccurate!",
                            desiredValue);
            }
        }
        else if (desiredValue != nullptr) {
            SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                        "COLOR_RANGE property does not exist on output plane. Colors may be inaccurate!");
        }

        m_LastColorRange = frame->color_range;
    }

    if (frame->colorspace != m_LastColorSpace) {
        const char* desiredValue = getDrmColorEncodingValue(frame);

        if (m_ColorEncodingProp != nullptr && desiredValue != nullptr) {
            int i;

            for (i = 0; i < m_ColorEncodingProp->count_enums; i++) {
                if (!strcmp(desiredValue, m_ColorEncodingProp->enums[i].name)) {
                    err = drmModeObjectSetProperty(m_DrmFd, m_PlaneId, DRM_MODE_OBJECT_PLANE,
                                                   m_ColorEncodingProp->prop_id, m_ColorEncodingProp->enums[i].value);
                    if (err == 0) {
                        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                                    "%s: %s",
                                    m_ColorEncodingProp->name,
                                    desiredValue);
                    }
                    else {
                        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                                     "drmModeObjectSetProperty(%s) failed: %d",
                                     m_ColorEncodingProp->name,
                                     errno);
                        // Non-fatal
                    }

                    break;
                }
            }

            if (i == m_ColorEncodingProp->count_enums) {
                SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                            "Unable to find matching COLOR_ENCODING value for '%s'. Colors may be inaccurate!",
                            desiredValue);
            }
        }
        else if (desiredValue != nullptr) {
            SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                        "COLOR_ENCODING property does not exist on output plane. Colors may be inaccurate!");
        }

        m_LastColorSpace = frame->colorspace;
    }

    // Update the overlay
    err = drmModeSetPlane(m_DrmFd, m_PlaneId, m_CrtcId, m_CurrentFbId, 0,
                          dst.x, dst.y,
                          dst.w, dst.h,
                          0, 0,
                          frame->width << 16,
                          frame->height << 16);
    if (err < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "drmModeSetPlane() failed: %d",
                     errno);
        drmModeRmFB(m_DrmFd, m_CurrentFbId);
        m_CurrentFbId = lastFbId;
        return;
    }

    // Free the previous FB object which has now been superseded
    drmModeRmFB(m_DrmFd, lastFbId);
}

bool DrmRenderer::needsTestFrame()
{
    return true;
}

bool DrmRenderer::testRenderFrame(AVFrame* frame) {
    // If we have a backend renderer, we must make sure it can
    // successfully export DRM PRIME frames.
    if (m_BackendRenderer != nullptr) {
        AVDRMFrameDescriptor drmDescriptor;

        // We shouldn't get here unless the backend at least claims
        // it can export DRM PRIME frames.
        SDL_assert(m_BackendRenderer->canExportDrmPrime());

        if (!m_BackendRenderer->mapDrmPrimeFrame(frame, &drmDescriptor)) {
            // It can't, so we can't use this renderer.
            return false;
        }

        m_BackendRenderer->unmapDrmPrimeFrame(&drmDescriptor);
    }

    return true;
}

bool DrmRenderer::isDirectRenderingSupported()
{
    return m_SupportsDirectRendering;
}

const char* DrmRenderer::getDrmColorEncodingValue(AVFrame* frame)
{
    switch (frame->colorspace) {
    case AVCOL_SPC_SMPTE170M:
        return "ITU-R BT.601 YCbCr";
    case AVCOL_SPC_BT709:
        return "ITU-R BT.709 YCbCr";
    case AVCOL_SPC_BT2020_NCL:
        return "ITU-R BT.2020 YCbCr";
    default:
        return NULL;
    }
}

const char* DrmRenderer::getDrmColorRangeValue(AVFrame* frame)
{
    switch (frame->color_range) {
    case AVCOL_RANGE_MPEG:
        return "YCbCr limited range";
    case AVCOL_RANGE_JPEG:
        return "YCbCr full range";
    default:
        return NULL;
    }
}

#ifdef HAVE_EGL

bool DrmRenderer::canExportEGL() {
    if (qgetenv("DRM_FORCE_DIRECT") == "1") {
        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                    "Using direct rendering due to environment variable");
        return false;
    }
    else if (qgetenv("DRM_FORCE_EGL") == "1") {
        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                    "Using EGL rendering due to environment variable");
        return true;
    }
    else if (m_SupportsDirectRendering && m_Main10Hdr) {
        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                    "Using direct rendering for HDR support");
        return false;
    }

    SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                "DRM backend supports exporting EGLImage");
    return true;
}

AVPixelFormat DrmRenderer::getEGLImagePixelFormat() {
    // This tells EGLRenderer to treat the EGLImage as a single opaque texture
    return AV_PIX_FMT_DRM_PRIME;
}

bool DrmRenderer::initializeEGL(EGLDisplay,
                                const EGLExtensions &ext) {
    if (!ext.isSupported("EGL_EXT_image_dma_buf_import")) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "DRM-EGL: DMABUF unsupported");
        return false;
    }

    m_EGLExtDmaBuf = ext.isSupported("EGL_EXT_image_dma_buf_import_modifiers");

    // NB: eglCreateImage() and eglCreateImageKHR() have slightly different definitions
    m_eglCreateImage = (typeof(m_eglCreateImage))eglGetProcAddress("eglCreateImage");
    m_eglCreateImageKHR = (typeof(m_eglCreateImageKHR))eglGetProcAddress("eglCreateImageKHR");
    m_eglDestroyImage = (typeof(m_eglDestroyImage))eglGetProcAddress("eglDestroyImage");
    m_eglDestroyImageKHR = (typeof(m_eglDestroyImageKHR))eglGetProcAddress("eglDestroyImageKHR");

    if (!(m_eglCreateImage && m_eglDestroyImage) &&
            !(m_eglCreateImageKHR && m_eglDestroyImageKHR)) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                     "Missing eglCreateImage()/eglDestroyImage() in EGL driver");
        return false;
    }

    return true;
}

ssize_t DrmRenderer::exportEGLImages(AVFrame *frame, EGLDisplay dpy,
                                     EGLImage images[EGL_MAX_PLANES]) {
    AVDRMFrameDescriptor* drmFrame = (AVDRMFrameDescriptor*)frame->data[0];

    memset(images, 0, sizeof(EGLImage) * EGL_MAX_PLANES);

    // DRM requires composed layers rather than separate layers per plane
    SDL_assert(drmFrame->nb_layers == 1);

    // Max 30 attributes (1 key + 1 value for each)
    const int MAX_ATTRIB_COUNT = 30 * 2;
    EGLAttrib attribs[MAX_ATTRIB_COUNT] = {
        EGL_LINUX_DRM_FOURCC_EXT, (EGLAttrib)drmFrame->layers[0].format,
        EGL_WIDTH, frame->width,
        EGL_HEIGHT, frame->height,
    };
    int attribIndex = 6;

    for (int i = 0; i < drmFrame->layers[0].nb_planes; ++i) {
        const auto &plane = drmFrame->layers[0].planes[i];
        const auto &object = drmFrame->objects[plane.object_index];

        switch (i) {
        case 0:
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE0_FD_EXT;
            attribs[attribIndex++] = object.fd;
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE0_OFFSET_EXT;
            attribs[attribIndex++] = plane.offset;
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE0_PITCH_EXT;
            attribs[attribIndex++] = plane.pitch;
            if (m_EGLExtDmaBuf && object.format_modifier != DRM_FORMAT_MOD_INVALID) {
                attribs[attribIndex++] = EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT;
                attribs[attribIndex++] = (EGLint)(object.format_modifier & 0xFFFFFFFF);
                attribs[attribIndex++] = EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT;
                attribs[attribIndex++] = (EGLint)(object.format_modifier >> 32);
            }
            break;

        case 1:
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE1_FD_EXT;
            attribs[attribIndex++] = object.fd;
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE1_OFFSET_EXT;
            attribs[attribIndex++] = plane.offset;
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE1_PITCH_EXT;
            attribs[attribIndex++] = plane.pitch;
            if (m_EGLExtDmaBuf && object.format_modifier != DRM_FORMAT_MOD_INVALID) {
                attribs[attribIndex++] = EGL_DMA_BUF_PLANE1_MODIFIER_LO_EXT;
                attribs[attribIndex++] = (EGLint)(object.format_modifier & 0xFFFFFFFF);
                attribs[attribIndex++] = EGL_DMA_BUF_PLANE1_MODIFIER_HI_EXT;
                attribs[attribIndex++] = (EGLint)(object.format_modifier >> 32);
            }
            break;

        case 2:
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE2_FD_EXT;
            attribs[attribIndex++] = object.fd;
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE2_OFFSET_EXT;
            attribs[attribIndex++] = plane.offset;
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE2_PITCH_EXT;
            attribs[attribIndex++] = plane.pitch;
            if (m_EGLExtDmaBuf && object.format_modifier != DRM_FORMAT_MOD_INVALID) {
                attribs[attribIndex++] = EGL_DMA_BUF_PLANE2_MODIFIER_LO_EXT;
                attribs[attribIndex++] = (EGLint)(object.format_modifier & 0xFFFFFFFF);
                attribs[attribIndex++] = EGL_DMA_BUF_PLANE2_MODIFIER_HI_EXT;
                attribs[attribIndex++] = (EGLint)(object.format_modifier >> 32);
            }
            break;

        case 3:
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE3_FD_EXT;
            attribs[attribIndex++] = object.fd;
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE3_OFFSET_EXT;
            attribs[attribIndex++] = plane.offset;
            attribs[attribIndex++] = EGL_DMA_BUF_PLANE3_PITCH_EXT;
            attribs[attribIndex++] = plane.pitch;
            if (m_EGLExtDmaBuf && object.format_modifier != DRM_FORMAT_MOD_INVALID) {
                attribs[attribIndex++] = EGL_DMA_BUF_PLANE3_MODIFIER_LO_EXT;
                attribs[attribIndex++] = (EGLint)(object.format_modifier & 0xFFFFFFFF);
                attribs[attribIndex++] = EGL_DMA_BUF_PLANE3_MODIFIER_HI_EXT;
                attribs[attribIndex++] = (EGLint)(object.format_modifier >> 32);
            }
            break;

        default:
            Q_UNREACHABLE();
        }
    }

    // Add colorspace data if present
    switch (frame->colorspace) {
    case AVCOL_SPC_BT2020_CL:
    case AVCOL_SPC_BT2020_NCL:
        attribs[attribIndex++] = EGL_YUV_COLOR_SPACE_HINT_EXT;
        attribs[attribIndex++] = EGL_ITU_REC2020_EXT;
        break;
    case AVCOL_SPC_SMPTE170M:
    case AVCOL_SPC_BT470BG:
    case AVCOL_SPC_FCC:
        attribs[attribIndex++] = EGL_YUV_COLOR_SPACE_HINT_EXT;
        attribs[attribIndex++] = EGL_ITU_REC601_EXT;
        break;
    case AVCOL_SPC_BT709:
        attribs[attribIndex++] = EGL_YUV_COLOR_SPACE_HINT_EXT;
        attribs[attribIndex++] = EGL_ITU_REC709_EXT;
        break;
    default:
        break;
    }

    // Add color range data if present
    switch (frame->color_range) {
    case AVCOL_RANGE_JPEG:
        attribs[attribIndex++] = EGL_SAMPLE_RANGE_HINT_EXT;
        attribs[attribIndex++] = EGL_YUV_FULL_RANGE_EXT;
        break;
    case AVCOL_RANGE_MPEG:
        attribs[attribIndex++] = EGL_SAMPLE_RANGE_HINT_EXT;
        attribs[attribIndex++] = EGL_YUV_NARROW_RANGE_EXT;
        break;
    default:
        break;
    }

    // Terminate the attribute list
    attribs[attribIndex++] = EGL_NONE;
    SDL_assert(attribIndex <= MAX_ATTRIB_COUNT);

    // Our EGLImages are non-planar, so we only populate the first entry
    if (m_eglCreateImage) {
        images[0] = m_eglCreateImage(dpy, EGL_NO_CONTEXT,
                                     EGL_LINUX_DMA_BUF_EXT,
                                     nullptr, attribs);
        if (!images[0]) {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                         "eglCreateImage() Failed: %d", eglGetError());
            goto fail;
        }
    }
    else {
        // Cast the EGLAttrib array elements to EGLint for the KHR extension
        EGLint intAttribs[MAX_ATTRIB_COUNT];
        for (int i = 0; i < MAX_ATTRIB_COUNT; i++) {
            intAttribs[i] = (EGLint)attribs[i];
        }

        images[0] = m_eglCreateImageKHR(dpy, EGL_NO_CONTEXT,
                                        EGL_LINUX_DMA_BUF_EXT,
                                        nullptr, intAttribs);
        if (!images[0]) {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                         "eglCreateImageKHR() Failed: %d", eglGetError());
            goto fail;
        }
    }

    return 1;

fail:
    freeEGLImages(dpy, images);
    return -1;
}

void DrmRenderer::freeEGLImages(EGLDisplay dpy, EGLImage images[EGL_MAX_PLANES]) {
    if (m_eglDestroyImage) {
        m_eglDestroyImage(dpy, images[0]);
    }
    else {
        m_eglDestroyImageKHR(dpy, images[0]);
    }

    // Our EGLImages are non-planar
    SDL_assert(images[1] == 0);
    SDL_assert(images[2] == 0);
}

#endif