mythvaapicontext.cpp

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// C++ headers
#include <algorithm>
 
// Qt
#include <QCoreApplication>
#include <QWaitCondition>
 
// Mythtv
#include "libmythbase/mythcorecontext.h"
#include "libmythbase/mythlogging.h"
#include "libmythui/mythmainwindow.h"
#include "libmythui/opengl/mythrenderopengl.h"
 
#include "decoders/avformatdecoder.h"
#include "mythplayerui.h"
#include "mythvaapicontext.h"
#include "opengl/mythvaapiinterop.h"
#include "videobuffers.h"
 
extern "C" {
#include "libavcodec/defs.h"
#include "libavutil/hwcontext_vaapi.h"
#include "libavutil/pixdesc.h"
#include "libavfilter/buffersink.h"
}
 
#define LOC QString("VAAPIDec: ")
 
MythVAAPIContext::MythVAAPIContext(DecoderBase* Parent, MythCodecID CodecID)
  : MythCodecContext(Parent, CodecID)
{
}
 
MythVAAPIContext::~MythVAAPIContext(void)
{
    DestroyDeinterlacer();
}
 
VAProfile MythVAAPIContext::VAAPIProfileForCodec(const AVCodecContext* Codec)
{
    if (!Codec)
        return VAProfileNone;
 
    switch (Codec->codec_id)
    {
        case AV_CODEC_ID_MPEG2VIDEO:
            switch (Codec->profile)
            {
                case AV_PROFILE_MPEG2_SIMPLE: return VAProfileMPEG2Simple;
                case AV_PROFILE_MPEG2_MAIN: return VAProfileMPEG2Main;
                default: break;
            }
            break;
        case AV_CODEC_ID_H263: return VAProfileH263Baseline;
        case AV_CODEC_ID_MPEG4:
            switch (Codec->profile)
            {
                case AV_PROFILE_MPEG4_SIMPLE: return VAProfileMPEG4Simple;
                case AV_PROFILE_MPEG4_ADVANCED_SIMPLE: return VAProfileMPEG4AdvancedSimple;
                case AV_PROFILE_MPEG4_MAIN: return VAProfileMPEG4Main;
                default: break;
            }
            break;
        case AV_CODEC_ID_H264:
            switch (Codec->profile)
            {
                case AV_PROFILE_H264_CONSTRAINED_BASELINE: return VAProfileH264ConstrainedBaseline;
                case AV_PROFILE_H264_MAIN: return VAProfileH264Main;
                case AV_PROFILE_H264_HIGH: return VAProfileH264High;
                default: break;
            }
            break;
        case AV_CODEC_ID_HEVC:
            switch (Codec->profile)
            {
                case AV_PROFILE_HEVC_MAIN: return VAProfileHEVCMain;
                case AV_PROFILE_HEVC_MAIN_10: return VAProfileHEVCMain10;
                default: break;
            }
            break;
        case AV_CODEC_ID_MJPEG: return VAProfileJPEGBaseline;
        case AV_CODEC_ID_WMV3:
        case AV_CODEC_ID_VC1:
            switch (Codec->profile)
            {
                case AV_PROFILE_VC1_SIMPLE: return VAProfileVC1Simple;
                case AV_PROFILE_VC1_MAIN: return VAProfileVC1Main;
                case AV_PROFILE_VC1_ADVANCED:
                case AV_PROFILE_VC1_COMPLEX: return VAProfileVC1Advanced;
                default: break;
            }
            break;
        case AV_CODEC_ID_VP8: return VAProfileVP8Version0_3;
        case AV_CODEC_ID_VP9:
            switch (Codec->profile)
            {
                case AV_PROFILE_VP9_0: return VAProfileVP9Profile0;
                case AV_PROFILE_VP9_2: return VAProfileVP9Profile2;
                default: break;
            }
            break;
        default: break;
    }
 
    return VAProfileNone;
}
 
inline AVPixelFormat MythVAAPIContext::FramesFormat(AVPixelFormat Format)
{
    switch (Format)
    {
        case AV_PIX_FMT_YUV420P10: return AV_PIX_FMT_P010;
        case AV_PIX_FMT_YUV420P12:
        case AV_PIX_FMT_YUV420P14:
        case AV_PIX_FMT_YUV420P16: return AV_PIX_FMT_P016;
        default: return AV_PIX_FMT_NV12;
    }
}
 
MythCodecID MythVAAPIContext::GetSupportedCodec(AVCodecContext** Context,
                                                const AVCodec** /*Codec*/,
                                                const QString& Decoder,
                                                uint StreamType)
{
    bool decodeonly = Decoder == "vaapi-dec";
    auto success = static_cast<MythCodecID>((decodeonly ? kCodec_MPEG1_VAAPI_DEC : kCodec_MPEG1_VAAPI) + (StreamType - 1));
    auto failure = static_cast<MythCodecID>(kCodec_MPEG1 + (StreamType - 1));
    auto vendor = HaveVAAPI();
    if (!Decoder.startsWith("vaapi") || vendor.isEmpty() || qEnvironmentVariableIsSet("NO_VAAPI"))
        return failure;
 
    const auto * codec   = avcodec_get_name((*Context)->codec_id);
    const auto * profile = avcodec_profile_name((*Context)->codec_id, (*Context)->profile);
    const auto * pixfmt  = av_get_pix_fmt_name((*Context)->pix_fmt);
 
    // Simple check for known profile
    auto desired = VAAPIProfileForCodec(*Context);
    if (desired == VAProfileNone)
    {
        LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("VAAPI does not support decoding '%1 %2 %3'")
            .arg(codec, profile, pixfmt));
        return failure;
    }
 
    // Check for ironlake decode only - which won't work due to FFmpeg frame format
    // constraints. May apply to other platforms.
    if (decodeonly)
    {
        if (vendor.contains("ironlake", Qt::CaseInsensitive))
        {
            LOG(VB_GENERAL, LOG_WARNING, LOC + "Disallowing VAAPI decode only for Ironlake");
            return failure;
        }
    }
    else
    {
        if (!FrameTypeIsSupported(*Context, FMT_VAAPI))
            return failure;
    }
 
    // Check profile support
    bool ok = false;
    const auto & profiles = MythVAAPIContext::GetProfiles();
    auto mythprofile = MythCodecContext::FFmpegToMythProfile((*Context)->codec_id, (*Context)->profile);
    auto haveprofile = [&](MythCodecContext::CodecProfile Profile, QSize Size)
    {
        return std::ranges::any_of(std::as_const(profiles),
                           [&Profile,Size](auto vaprofile)
                               { return vaprofile.first == Profile &&
                                        vaprofile.second.first.width() <= Size.width() &&
                                        vaprofile.second.first.height() <= Size.height() &&
                                        vaprofile.second.second.width() >= Size.width() &&
                                        vaprofile.second.second.height() >= Size.height(); } );
    };
 
    ok = haveprofile(mythprofile, QSize((*Context)->width, (*Context)->height));
    // use JPEG support as a proxy for MJPEG (full range YUV)
    if (ok && (AV_PIX_FMT_YUVJ420P == (*Context)->pix_fmt || AV_PIX_FMT_YUVJ422P == (*Context)->pix_fmt ||
               AV_PIX_FMT_YUVJ444P == (*Context)->pix_fmt))
    {
        ok = haveprofile(MythCodecContext::MJPEG, QSize());
    }
 
    auto desc = QString("'%1 %2 %3 %4x%5'").arg(codec, profile, pixfmt)
                                          .arg((*Context)->width).arg((*Context)->height);
 
    if (ok)
    {
        LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("VAAPI supports decoding %1").arg(desc));
        (*Context)->pix_fmt = AV_PIX_FMT_VAAPI;
        return success;
    }
 
    LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("VAAPI does NOT support %1").arg(desc));
    return failure;
}
 
AVPixelFormat MythVAAPIContext::GetFormat(AVCodecContext* Context, const AVPixelFormat* PixFmt)
{
    while (*PixFmt != AV_PIX_FMT_NONE)
    {
        if (*PixFmt == AV_PIX_FMT_VAAPI)
            if (MythCodecContext::InitialiseDecoder(Context, MythVAAPIContext::InitialiseContext, "VAAPI context creation") >= 0)
                return AV_PIX_FMT_VAAPI;
        PixFmt++;
    }
    return AV_PIX_FMT_NONE;
}
 
AVPixelFormat MythVAAPIContext::GetFormat2(AVCodecContext* Context, const AVPixelFormat* PixFmt)
{
    while (*PixFmt != AV_PIX_FMT_NONE)
    {
        if (*PixFmt == AV_PIX_FMT_VAAPI)
            if (InitialiseContext2(Context) >= 0)
                return AV_PIX_FMT_VAAPI;
        PixFmt++;
    }
    return AV_PIX_FMT_NONE;
}
 
int MythVAAPIContext::InitialiseContext(AVCodecContext* Context)
{
    if (!Context || !gCoreContext->IsUIThread())
        return -1;
 
    // The interop must have a reference to the ui player so it can be deleted
    // from the main thread.
    MythVAAPIInterop* interop = nullptr;
    if (auto * player = GetPlayerUI(Context); player != nullptr)
        if (auto * render = dynamic_cast<MythRenderOpenGL*>(player->GetRender()); render != nullptr)
            interop = MythVAAPIInterop::CreateVAAPI(player, render);
 
    if (!interop || !interop->GetDisplay())
    {
        if (interop)
            interop->DecrRef();
        return -1;
    }
 
    // Create hardware device context
    auto * hwdeviceref = av_hwdevice_ctx_alloc(AV_HWDEVICE_TYPE_VAAPI);
    if (!hwdeviceref || !hwdeviceref->data)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to create VAAPI hardware device context");
        return -1;
    }
 
    AVVAAPIDeviceContext * vaapidevicectx = nullptr;
    if (auto * hwdevicecontext = reinterpret_cast<AVHWDeviceContext*>(hwdeviceref->data); hwdevicecontext != nullptr)
        if (vaapidevicectx = reinterpret_cast<AVVAAPIDeviceContext*>(hwdevicecontext->hwctx); !vaapidevicectx)
            return -1;
 
    // Set the display
    vaapidevicectx->display = interop->GetDisplay();
 
    // Initialise hardware device context
    int res = av_hwdevice_ctx_init(hwdeviceref);
    if (res < 0)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to initialise VAAPI hardware context");
        av_buffer_unref(&hwdeviceref);
        interop->DecrRef();
        return res;
    }
 
    // Allocate the hardware frames context for FFmpeg
    Context->hw_frames_ctx = av_hwframe_ctx_alloc(hwdeviceref);
    if (!Context->hw_frames_ctx)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to create VAAPI hardware frames context");
        av_buffer_unref(&hwdeviceref);
        interop->DecrRef();
        return -1;
    }
 
    // Setup the frames context
    auto * hw_frames_ctx = reinterpret_cast<AVHWFramesContext*>(Context->hw_frames_ctx->data);
    auto * vaapi_frames_ctx = reinterpret_cast<AVVAAPIFramesContext*>(hw_frames_ctx->hwctx);
 
    // Workarounds for specific drivers, surface formats and codecs
    // NV12 seems to work best across GPUs and codecs with the exception of
    // MPEG2 on Ironlake where it seems to return I420 labelled as NV12. I420 is
    // buggy on Sandybridge (stride?) and produces a mixture of I420/NV12 frames
    // for H.264 on Ironlake.
    // This may need extending for AMD etc
 
    auto vendor = interop->GetVendor();
    if (vendor.contains("i965", Qt::CaseInsensitive))
    {
        int format = VA_FOURCC_NV12;
        if (vendor.contains("ironlake", Qt::CaseInsensitive))
            if (CODEC_IS_MPEG(Context->codec_id))
                format = VA_FOURCC_I420;
 
        if (format != VA_FOURCC_NV12)
        {
            auto vaapiid = static_cast<MythCodecID>(kCodec_MPEG1_VAAPI + (mpeg_version(Context->codec_id) - 1));
            LOG(VB_GENERAL, LOG_INFO, LOC + QString("Forcing surface format for %1 and %2 with driver '%3'")
                .arg(toString(vaapiid), MythOpenGLInterop::TypeToString(interop->GetType()), vendor));
        }
 
        std::array<VASurfaceAttrib,3> prefs {{
            { .type=VASurfaceAttribPixelFormat,
              .flags=VA_SURFACE_ATTRIB_SETTABLE,
              .value={ VAGenericValueTypeInteger, { format } } },
            { .type=VASurfaceAttribUsageHint,
              .flags=VA_SURFACE_ATTRIB_SETTABLE,
              .value={ VAGenericValueTypeInteger, { VA_SURFACE_ATTRIB_USAGE_HINT_DISPLAY } } },
            { .type=VASurfaceAttribMemoryType,
              .flags=VA_SURFACE_ATTRIB_SETTABLE,
              .value={ VAGenericValueTypeInteger, { VA_SURFACE_ATTRIB_MEM_TYPE_VA} } } }};
        vaapi_frames_ctx->attributes = prefs.data();
        vaapi_frames_ctx->nb_attributes = 3;
    }
 
    hw_frames_ctx->sw_format         = FramesFormat(Context->sw_pix_fmt);
    int referenceframes = AvFormatDecoder::GetMaxReferenceFrames(Context);
    hw_frames_ctx->initial_pool_size = static_cast<int>(VideoBuffers::GetNumBuffers(FMT_VAAPI, referenceframes, true));
    hw_frames_ctx->format            = AV_PIX_FMT_VAAPI;
    hw_frames_ctx->width             = Context->coded_width;
    hw_frames_ctx->height            = Context->coded_height;
    // The frames context now holds the reference to MythVAAPIInterop
    hw_frames_ctx->user_opaque       = interop;
    // Set the callback to ensure it is released
    hw_frames_ctx->free              = &MythCodecContext::FramesContextFinished;
 
    // Initialise hardwar frames context
    res = av_hwframe_ctx_init(Context->hw_frames_ctx);
    if (res < 0)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to initialise VAAPI frames context");
        av_buffer_unref(&hwdeviceref);
        av_buffer_unref(&(Context->hw_frames_ctx));
        return res;
    }
 
    LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("VAAPI FFmpeg buffer pool created with %1 %2x%3 surfaces (%4 references)")
        .arg(vaapi_frames_ctx->nb_surfaces).arg(Context->coded_width).arg(Context->coded_height)
        .arg(referenceframes));
    av_buffer_unref(&hwdeviceref);
 
    NewHardwareFramesContext();
 
    return 0;
}
 
int MythVAAPIContext::InitialiseContext2(AVCodecContext* Context)
{
    if (!Context)
        return -1;
 
    auto * device = MythCodecContext::CreateDevice(AV_HWDEVICE_TYPE_VAAPI, nullptr,
                                                   gCoreContext->GetSetting("VAAPIDevice"));
    Context->hw_frames_ctx = av_hwframe_ctx_alloc(device);
    if (!Context->hw_frames_ctx)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to create VAAPI hardware frames context");
        av_buffer_unref(&device);
        return -1;
    }
 
    int referenceframes     = AvFormatDecoder::GetMaxReferenceFrames(Context);
    auto * hw_frames_ctx    = reinterpret_cast<AVHWFramesContext*>(Context->hw_frames_ctx->data);
    auto * vaapi_frames_ctx = reinterpret_cast<AVVAAPIFramesContext*>(hw_frames_ctx->hwctx);
    hw_frames_ctx->sw_format         = FramesFormat(Context->sw_pix_fmt);
    hw_frames_ctx->format            = AV_PIX_FMT_VAAPI;
    hw_frames_ctx->width             = Context->coded_width;
    hw_frames_ctx->height            = Context->coded_height;
    hw_frames_ctx->initial_pool_size = static_cast<int>(VideoBuffers::GetNumBuffers(FMT_VAAPI, referenceframes));
    hw_frames_ctx->free              = &MythCodecContext::FramesContextFinished;
    if (av_hwframe_ctx_init(Context->hw_frames_ctx) < 0)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Failed to initialise VAAPI frames context");
        av_buffer_unref(&device);
        av_buffer_unref(&(Context->hw_frames_ctx));
        return -1;
    }
 
    LOG(VB_PLAYBACK, LOG_INFO, LOC + QString("VAAPI FFmpeg buffer pool created with %1 %2x%3 surfaces (%4 references)")
        .arg(vaapi_frames_ctx->nb_surfaces).arg(Context->coded_width).arg(Context->coded_height)
        .arg(referenceframes));
    av_buffer_unref(&device);
 
    NewHardwareFramesContext();
 
    return 0;
}
 
QString MythVAAPIContext::HaveVAAPI(bool ReCheck /*= false*/)
{
    static QString s_vendor;
    static bool s_checked = false;
    if (s_checked && !ReCheck)
        return s_vendor;
    s_checked = true;
 
    auto * context = MythCodecContext::CreateDevice(AV_HWDEVICE_TYPE_VAAPI, nullptr,
                                                    gCoreContext->GetSetting("VAAPIDevice"));
    if (context)
    {
        auto * hwdevice = reinterpret_cast<AVHWDeviceContext*>(context->data);
        auto * hwctx    = reinterpret_cast<AVVAAPIDeviceContext*>(hwdevice->hwctx);
        s_vendor = QString(vaQueryVendorString(hwctx->display));
        if (s_vendor.contains("vdpau", Qt::CaseInsensitive))
        {
            s_vendor = QString();
            LOG(VB_GENERAL, LOG_INFO, LOC + "VAAPI is using a VDPAU backend - ignoring VAAPI");
        }
        else if (s_vendor.isEmpty())
        {
            LOG(VB_GENERAL, LOG_INFO, LOC + "Unknown VAAPI vendor - ignoring VAAPI");
        }
        else
        {
            LOG(VB_GENERAL, LOG_INFO, LOC + "Supported/available VAAPI decoders:");
            const auto & profiles = MythVAAPIContext::GetProfiles();
            for (const auto & profile : std::as_const(profiles))
            {
                if (profile.first != MythCodecContext::MJPEG)
                {
                    LOG(VB_GENERAL, LOG_INFO, LOC +
                        MythCodecContext::GetProfileDescription(profile.first, profile.second.second));
                }
            }
        }
        av_buffer_unref(&context);
    }
    else
    {
        LOG(VB_GENERAL, LOG_INFO, LOC + "VAAPI functionality checked failed");
    }
 
    return s_vendor;
}
 
const VAAPIProfiles& MythVAAPIContext::GetProfiles()
{
    static QRecursiveMutex lock;
    static bool s_initialised = false;
    static VAAPIProfiles s_profiles;
 
    QMutexLocker locker(&lock);
    if (s_initialised)
        return s_profiles;
    s_initialised = true;
 
    auto VAToMythProfile = [](VAProfile Profile)
    {
        switch (Profile)
        {
            case VAProfileMPEG2Simple:   return MythCodecContext::MPEG2Simple;
            case VAProfileMPEG2Main:     return MythCodecContext::MPEG2Main;
            case VAProfileMPEG4Simple:   return MythCodecContext::MPEG4Simple;
            case VAProfileMPEG4AdvancedSimple: return MythCodecContext::MPEG4AdvancedSimple;
            case VAProfileMPEG4Main:     return MythCodecContext::MPEG4Main;
            case VAProfileH263Baseline:  return MythCodecContext::H263;
            case VAProfileH264ConstrainedBaseline: return MythCodecContext::H264ConstrainedBaseline;
            case VAProfileH264Main:      return MythCodecContext::H264Main;
            case VAProfileH264High:      return MythCodecContext::H264High;
            case VAProfileVC1Simple:     return MythCodecContext::VC1Simple;
            case VAProfileVC1Main:       return MythCodecContext::VC1Main;
            case VAProfileVC1Advanced:   return MythCodecContext::VC1Advanced;
            case VAProfileVP8Version0_3: return MythCodecContext::VP8;
            case VAProfileVP9Profile0:   return MythCodecContext::VP9_0;
            case VAProfileVP9Profile2:   return MythCodecContext::VP9_2;
            case VAProfileHEVCMain:      return MythCodecContext::HEVCMain;
            case VAProfileHEVCMain10:    return MythCodecContext::HEVCMain10;
            case VAProfileJPEGBaseline:  return MythCodecContext::MJPEG;
            default: break;
        }
        return MythCodecContext::NoProfile;
    };
 
    auto * hwdevicectx = MythCodecContext::CreateDevice(AV_HWDEVICE_TYPE_VAAPI, nullptr,
                                                        gCoreContext->GetSetting("VAAPIDevice"));
    if(!hwdevicectx)
        return s_profiles;
 
    auto * device = reinterpret_cast<AVHWDeviceContext*>(hwdevicectx->data);
    auto * hwctx  = reinterpret_cast<AVVAAPIDeviceContext*>(device->hwctx);
 
    int profilecount = vaMaxNumProfiles(hwctx->display);
    auto * profilelist = static_cast<VAProfile*>(av_malloc_array(static_cast<size_t>(profilecount), sizeof(VAProfile)));
    if (vaQueryConfigProfiles(hwctx->display, profilelist, &profilecount) == VA_STATUS_SUCCESS)
    {
        for (auto i = 0; i < profilecount; ++i)
        {
            VAProfile profile = profilelist[i];
            if (profile == VAProfileNone || profile == VAProfileH264StereoHigh || profile == VAProfileH264MultiviewHigh)
                continue;
            int count = 0;
            int entrysize = vaMaxNumEntrypoints(hwctx->display);
            auto * entrylist = static_cast<VAEntrypoint*>(av_malloc_array(static_cast<size_t>(entrysize), sizeof(VAEntrypoint)));
            if (vaQueryConfigEntrypoints(hwctx->display, profile, entrylist, &count) == VA_STATUS_SUCCESS)
            {
                for (int j = 0; j < count; ++j)
                {
                    if (entrylist[j] != VAEntrypointVLD)
                        continue;
 
                    QSize minsize;
                    QSize maxsize;
                    VAConfigID config = 0;
                    if (vaCreateConfig(hwctx->display, profile, VAEntrypointVLD, nullptr, 0, &config) != VA_STATUS_SUCCESS)
                        continue;
 
                    uint attrcount = 0;
                    if (vaQuerySurfaceAttributes(hwctx->display, config, nullptr, &attrcount) == VA_STATUS_SUCCESS)
                    {
                        auto * attrlist = static_cast<VASurfaceAttrib*>(av_malloc(attrcount * sizeof(VASurfaceAttrib)));
                        if (vaQuerySurfaceAttributes(hwctx->display, config, attrlist, &attrcount) == VA_STATUS_SUCCESS)
                        {
                            for (uint k = 0; k < attrcount; ++k)
                            {
                                if (attrlist[k].type == VASurfaceAttribMaxWidth)
                                    maxsize.setWidth(attrlist[k].value.value.i);
                                if (attrlist[k].type == VASurfaceAttribMaxHeight)
                                    maxsize.setHeight(attrlist[k].value.value.i);
                                if (attrlist[k].type == VASurfaceAttribMinWidth)
                                    minsize.setWidth(attrlist[k].value.value.i);
                                if (attrlist[k].type == VASurfaceAttribMinHeight)
                                    minsize.setHeight(attrlist[k].value.value.i);
                            }
                        }
                        av_freep(reinterpret_cast<void*>(&attrlist));
                    }
                    vaDestroyConfig(hwctx->display, config);
                    s_profiles.append(VAAPIProfile(VAToMythProfile(profile), QPair<QSize,QSize>(minsize, maxsize)));
                }
            }
            av_freep(reinterpret_cast<void*>(&entrylist));
        }
    }
    av_freep(reinterpret_cast<void*>(&profilelist));
    av_buffer_unref(&hwdevicectx);
    return s_profiles;
}
 
void MythVAAPIContext::GetDecoderList(QStringList& Decoders)
{
    const auto & profiles = MythVAAPIContext::GetProfiles();
    if (profiles.isEmpty())
        return;
    Decoders.append("VAAPI:");
    for (const auto & profile : std::as_const(profiles))
        if (profile.first != MythCodecContext::MJPEG)
            Decoders.append(MythCodecContext::GetProfileDescription(profile.first, profile.second.second));
}
 
void MythVAAPIContext::InitVideoCodec(AVCodecContext* Context, bool SelectedStream, bool& DirectRendering)
{
    if (codec_is_vaapi(m_codecID))
    {
        Context->get_buffer2 = MythCodecContext::GetBuffer;
        Context->get_format  = MythVAAPIContext::GetFormat;
        Context->slice_flags = SLICE_FLAG_CODED_ORDER | SLICE_FLAG_ALLOW_FIELD;
        return;
    }
    if (codec_is_vaapi_dec(m_codecID))
    {
        Context->get_format = MythVAAPIContext::GetFormat2;
        Context->slice_flags = SLICE_FLAG_CODED_ORDER | SLICE_FLAG_ALLOW_FIELD;
        DirectRendering = false;
        return;
    }
 
    MythCodecContext::InitVideoCodec(Context, SelectedStream, DirectRendering);
}
 
bool MythVAAPIContext::RetrieveFrame(AVCodecContext* /*unused*/, MythVideoFrame* Frame, AVFrame* AvFrame)
{
    if (AvFrame->format != AV_PIX_FMT_VAAPI)
        return false;
    if (codec_is_vaapi_dec(m_codecID))
        return RetrieveHWFrame(Frame, AvFrame);
    return false;
}
 
int MythVAAPIContext::FilteredReceiveFrame(AVCodecContext* Context, AVFrame* Frame)
{
    int ret = 0;
 
    while (true)
    {
        if (m_filterGraph && ((m_filterWidth != Context->coded_width) || (m_filterHeight != Context->coded_height)))
        {
            LOG(VB_GENERAL, LOG_WARNING, LOC + "Input changed - deleting filter");
            DestroyDeinterlacer();
        }
 
        if (m_filterGraph)
        {
            ret = av_buffersink_get_frame(m_filterSink, Frame);
            if  (ret >= 0)
            {
                if (m_filterPriorPTS[0] && m_filterPTSUsed == m_filterPriorPTS[1])
                {
                    Frame->pts = m_filterPriorPTS[1] + ((m_filterPriorPTS[1] - m_filterPriorPTS[0]) / 2);
                    av_frame_remove_side_data(Frame, AV_FRAME_DATA_A53_CC);
                }
                else
                {
                    Frame->pts = m_filterPriorPTS[1];
                    m_filterPTSUsed = m_filterPriorPTS[1];
                }
            }
            if (ret != AVERROR(EAGAIN))
                break;
        }
 
        // EAGAIN or no filter graph
        ret = avcodec_receive_frame(Context, Frame);
        if (ret == 0)
        {
            // preserve interlaced flags
            m_lastInterlaced = (Frame->flags & AV_FRAME_FLAG_INTERLACED) != 0;
            m_lastTopFieldFirst = (Frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) != 0;
        }
 
        if (ret < 0)
            break;
 
        // some streams with missing timestamps break frame timing when doublerate
        // so replace with dts if available
        int64_t pts = Frame->pts;
        if (pts == AV_NOPTS_VALUE && Frame->pkt_dts != AV_NOPTS_VALUE && m_deinterlacer2x)
            pts = Frame->pkt_dts;
        m_filterPriorPTS[0] = m_filterPriorPTS[1];
        m_filterPriorPTS[1] = pts;
 
        if (!m_filterGraph)
            break;
 
        ret = av_buffersrc_add_frame(m_filterSource, Frame);
        if (ret < 0)
            break;
    }
 
    return ret;
}
 
void MythVAAPIContext::PostProcessFrame(AVCodecContext* Context, MythVideoFrame* Frame)
{
    if (!Frame || !codec_is_vaapi_dec(m_codecID) || !Context->hw_frames_ctx)
        return;
 
    // if VAAPI driver deints are errored or not available (older boards), then
    // allow CPU/GLSL
    if (m_filterError)
    {
        Frame->m_deinterlaceAllowed = Frame->m_deinterlaceAllowed & ~DEINT_DRIVER;
        return;
    }
    if (kCodec_HEVC_VAAPI_DEC == m_codecID || kCodec_VP9_VAAPI_DEC == m_codecID ||
        kCodec_VP8_VAAPI_DEC == m_codecID)
    {
        // enabling VPP deinterlacing with these codecs breaks decoding for some reason.
        // HEVC interlacing is not currently detected by FFmpeg and I can't find
        // any interlaced VP8/9 material. Shaders and/or CPU deints will be available
        // as appropriate
        m_filterError = true;
        LOG(VB_GENERAL, LOG_INFO, LOC + QString("Disabling VAAPI VPP deinterlacer for %1")
            .arg(toString(m_codecID)));
        return;
    }
 
    // if this frame has already been deinterlaced, then flag the deinterlacer and
    // that the frame has already been deinterlaced.
    // the FFmpeg vaapi deint filter will mark frames as progressive, so restore the
    // interlaced flags to ensure auto deinterlacing continues to work
    if (m_deinterlacer)
    {
        Frame->m_interlaced = m_lastInterlaced;
        Frame->m_topFieldFirst = m_lastTopFieldFirst;
        Frame->m_deinterlaceInuse = m_deinterlacer | DEINT_DRIVER;
        Frame->m_deinterlaceInuse2x = m_deinterlacer2x;
        Frame->m_alreadyDeinterlaced = true;
    }
 
    // N.B. this picks up the scan tracking in MythPlayer. So we can
    // auto enable deinterlacing etc and override Progressive/Interlaced - but
    // no reversed interlaced.
    MythDeintType vaapideint = DEINT_NONE;
    MythDeintType singlepref = Frame->GetSingleRateOption(DEINT_DRIVER);
    MythDeintType doublepref = Frame->GetDoubleRateOption(DEINT_DRIVER);
    bool doublerate = true;
    bool other = false;
 
    // For decode only, a CPU or shader deint may also be used/preferred
    if (doublepref)
        vaapideint = doublepref;
    else if (Frame->GetDoubleRateOption(DEINT_CPU | DEINT_SHADER))
        other = true;
 
    if (!vaapideint && !other && singlepref)
    {
        doublerate = false;
        vaapideint = singlepref;
    }
 
    // nothing to see
    if (vaapideint == DEINT_NONE)
    {
        if (m_deinterlacer)
            DestroyDeinterlacer();
        return;
    }
 
    // already setup
    if ((m_deinterlacer == vaapideint) && (m_deinterlacer2x == doublerate))
        return;
 
    // Start from scratch
    DestroyDeinterlacer();
    m_framesCtx = av_buffer_ref(Context->hw_frames_ctx);
    if (!MythVAAPIInterop::SetupDeinterlacer(vaapideint, doublerate, Context->hw_frames_ctx,
                                             Context->coded_width, Context->coded_height,
                                             m_filterGraph, m_filterSource, m_filterSink))
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + QString("Failed to create deinterlacer %1 - disabling")
            .arg(MythVideoFrame::DeinterlacerName(vaapideint | DEINT_DRIVER, doublerate, FMT_VAAPI)));
        DestroyDeinterlacer();
        m_filterError = true;
    }
    else
    {
        m_deinterlacer = vaapideint;
        m_deinterlacer2x = doublerate;
        m_filterWidth = Context->coded_width;
        m_filterHeight = Context->coded_height;
    }
}
 
bool MythVAAPIContext::IsDeinterlacing(bool& DoubleRate, bool StreamChange)
{
    // the VAAPI deinterlacer can be turned on and off, so on stream changes
    // return false to ensure auto deint works for the new format (the deinterlacer
    // refers to the current format)
    if (m_deinterlacer && !StreamChange)
    {
        DoubleRate = m_deinterlacer2x;
        return true;
    }
    DoubleRate = false;
    return false;
}
 
bool MythVAAPIContext::DecoderWillResetOnFlush()
{
    // HEVC appears to be OK
    return kCodec_H264_VAAPI == m_codecID;
}
 
bool MythVAAPIContext::DecoderWillResetOnAspect()
{
    // Only MPEG2 tested so far
    return (kCodec_MPEG2_VAAPI ==  m_codecID) || (kCodec_MPEG2_VAAPI_DEC == m_codecID);
}
 
void MythVAAPIContext::DestroyDeinterlacer()
{
    if (m_filterGraph)
        LOG(VB_GENERAL, LOG_INFO, LOC + "Destroying VAAPI deinterlacer");
    avfilter_graph_free(&m_filterGraph);
    m_filterGraph = nullptr;
    m_filterSink = nullptr;
    m_filterSource = nullptr;
    m_filterPTSUsed = 0;
    m_filterPriorPTS.fill(0);
    m_filterWidth = 0;
    m_filterHeight = 0;
    if (m_framesCtx)
        av_buffer_unref(&m_framesCtx);
    m_deinterlacer = DEINT_NONE;
    m_deinterlacer2x = false;
}