2 files changed, 632 insertions, 0 deletions

diff --git a/src/video_core/host1x/ffmpeg/ffmpeg.cpp b/src/video_core/host1x/ffmpeg/ffmpeg.cpp
new file mode 100644
index 000000000..dcd07e6d2
--- /dev/null
+++ b/src/video_core/host1x/ffmpeg/ffmpeg.cpp
@@ -0,0 +1,419 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "common/scope_exit.h"
+#include "common/settings.h"
+#include "video_core/host1x/ffmpeg/ffmpeg.h"
+
+extern "C" {
+#ifdef LIBVA_FOUND
+// for querying VAAPI driver information
+#include <libavutil/hwcontext_vaapi.h>
+#endif
+}
+
+namespace FFmpeg {
+
+namespace {
+
+constexpr AVPixelFormat PreferredGpuFormat = AV_PIX_FMT_NV12;
+constexpr AVPixelFormat PreferredCpuFormat = AV_PIX_FMT_YUV420P;
+constexpr std::array PreferredGpuDecoders = {
+    AV_HWDEVICE_TYPE_CUDA,
+#ifdef _WIN32
+    AV_HWDEVICE_TYPE_D3D11VA,
+    AV_HWDEVICE_TYPE_DXVA2,
+#elif defined(__unix__)
+    AV_HWDEVICE_TYPE_VAAPI,
+    AV_HWDEVICE_TYPE_VDPAU,
+#endif
+    // last resort for Linux Flatpak (w/ NVIDIA)
+    AV_HWDEVICE_TYPE_VULKAN,
+};
+
+AVPixelFormat GetGpuFormat(AVCodecContext* codec_context, const AVPixelFormat* pix_fmts) {
+    for (const AVPixelFormat* p = pix_fmts; *p != AV_PIX_FMT_NONE; ++p) {
+        if (*p == codec_context->pix_fmt) {
+            return codec_context->pix_fmt;
+        }
+    }
+
+    LOG_INFO(HW_GPU, "Could not find compatible GPU AV format, falling back to CPU");
+    av_buffer_unref(&codec_context->hw_device_ctx);
+
+    codec_context->pix_fmt = PreferredCpuFormat;
+    return codec_context->pix_fmt;
+}
+
+std::string AVError(int errnum) {
+    char errbuf[AV_ERROR_MAX_STRING_SIZE] = {};
+    av_make_error_string(errbuf, sizeof(errbuf) - 1, errnum);
+    return errbuf;
+}
+
+} // namespace
+
+Packet::Packet(std::span<const u8> data) {
+    m_packet = av_packet_alloc();
+    m_packet->data = const_cast<u8*>(data.data());
+    m_packet->size = static_cast<s32>(data.size());
+}
+
+Packet::~Packet() {
+    av_packet_free(&m_packet);
+}
+
+Frame::Frame() {
+    m_frame = av_frame_alloc();
+}
+
+Frame::~Frame() {
+    av_frame_free(&m_frame);
+}
+
+Decoder::Decoder(Tegra::Host1x::NvdecCommon::VideoCodec codec) {
+    const AVCodecID av_codec = [&] {
+        switch (codec) {
+        case Tegra::Host1x::NvdecCommon::VideoCodec::H264:
+            return AV_CODEC_ID_H264;
+        case Tegra::Host1x::NvdecCommon::VideoCodec::VP8:
+            return AV_CODEC_ID_VP8;
+        case Tegra::Host1x::NvdecCommon::VideoCodec::VP9:
+            return AV_CODEC_ID_VP9;
+        default:
+            UNIMPLEMENTED_MSG("Unknown codec {}", codec);
+            return AV_CODEC_ID_NONE;
+        }
+    }();
+
+    m_codec = avcodec_find_decoder(av_codec);
+}
+
+bool Decoder::SupportsDecodingOnDevice(AVPixelFormat* out_pix_fmt, AVHWDeviceType type) const {
+    for (int i = 0;; i++) {
+        const AVCodecHWConfig* config = avcodec_get_hw_config(m_codec, i);
+        if (!config) {
+            LOG_DEBUG(HW_GPU, "{} decoder does not support device type {}", m_codec->name,
+                      av_hwdevice_get_type_name(type));
+            break;
+        }
+        if ((config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX) != 0 &&
+            config->device_type == type) {
+            LOG_INFO(HW_GPU, "Using {} GPU decoder", av_hwdevice_get_type_name(type));
+            *out_pix_fmt = config->pix_fmt;
+            return true;
+        }
+    }
+
+    return false;
+}
+
+std::vector<AVHWDeviceType> HardwareContext::GetSupportedDeviceTypes() {
+    std::vector<AVHWDeviceType> types;
+    AVHWDeviceType current_device_type = AV_HWDEVICE_TYPE_NONE;
+
+    while (true) {
+        current_device_type = av_hwdevice_iterate_types(current_device_type);
+        if (current_device_type == AV_HWDEVICE_TYPE_NONE) {
+            return types;
+        }
+
+        types.push_back(current_device_type);
+    }
+}
+
+HardwareContext::~HardwareContext() {
+    av_buffer_unref(&m_gpu_decoder);
+}
+
+bool HardwareContext::InitializeForDecoder(DecoderContext& decoder_context,
+                                           const Decoder& decoder) {
+    const auto supported_types = GetSupportedDeviceTypes();
+    for (const auto type : PreferredGpuDecoders) {
+        AVPixelFormat hw_pix_fmt;
+
+        if (std::ranges::find(supported_types, type) == supported_types.end()) {
+            LOG_DEBUG(HW_GPU, "{} explicitly unsupported", av_hwdevice_get_type_name(type));
+            continue;
+        }
+
+        if (!this->InitializeWithType(type)) {
+            continue;
+        }
+
+        if (decoder.SupportsDecodingOnDevice(&hw_pix_fmt, type)) {
+            decoder_context.InitializeHardwareDecoder(*this, hw_pix_fmt);
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool HardwareContext::InitializeWithType(AVHWDeviceType type) {
+    av_buffer_unref(&m_gpu_decoder);
+
+    if (const int ret = av_hwdevice_ctx_create(&m_gpu_decoder, type, nullptr, nullptr, 0);
+        ret < 0) {
+        LOG_DEBUG(HW_GPU, "av_hwdevice_ctx_create({}) failed: {}", av_hwdevice_get_type_name(type),
+                  AVError(ret));
+        return false;
+    }
+
+#ifdef LIBVA_FOUND
+    if (type == AV_HWDEVICE_TYPE_VAAPI) {
+        // We need to determine if this is an impersonated VAAPI driver.
+        auto* hwctx = reinterpret_cast<AVHWDeviceContext*>(m_gpu_decoder->data);
+        auto* vactx = static_cast<AVVAAPIDeviceContext*>(hwctx->hwctx);
+        const char* vendor_name = vaQueryVendorString(vactx->display);
+        if (strstr(vendor_name, "VDPAU backend")) {
+            // VDPAU impersonated VAAPI impls are super buggy, we need to skip them.
+            LOG_DEBUG(HW_GPU, "Skipping VDPAU impersonated VAAPI driver");
+            return false;
+        } else {
+            // According to some user testing, certain VAAPI drivers (Intel?) could be buggy.
+            // Log the driver name just in case.
+            LOG_DEBUG(HW_GPU, "Using VAAPI driver: {}", vendor_name);
+        }
+    }
+#endif
+
+    return true;
+}
+
+DecoderContext::DecoderContext(const Decoder& decoder) {
+    m_codec_context = avcodec_alloc_context3(decoder.GetCodec());
+    av_opt_set(m_codec_context->priv_data, "tune", "zerolatency", 0);
+    m_codec_context->thread_count = 0;
+    m_codec_context->thread_type &= ~FF_THREAD_FRAME;
+}
+
+DecoderContext::~DecoderContext() {
+    av_buffer_unref(&m_codec_context->hw_device_ctx);
+    avcodec_free_context(&m_codec_context);
+}
+
+void DecoderContext::InitializeHardwareDecoder(const HardwareContext& context,
+                                               AVPixelFormat hw_pix_fmt) {
+    m_codec_context->hw_device_ctx = av_buffer_ref(context.GetBufferRef());
+    m_codec_context->get_format = GetGpuFormat;
+    m_codec_context->pix_fmt = hw_pix_fmt;
+}
+
+bool DecoderContext::OpenContext(const Decoder& decoder) {
+    if (const int ret = avcodec_open2(m_codec_context, decoder.GetCodec(), nullptr); ret < 0) {
+        LOG_ERROR(HW_GPU, "avcodec_open2 error: {}", AVError(ret));
+        return false;
+    }
+
+    if (!m_codec_context->hw_device_ctx) {
+        LOG_INFO(HW_GPU, "Using FFmpeg software decoding");
+    }
+
+    return true;
+}
+
+bool DecoderContext::SendPacket(const Packet& packet) {
+    if (const int ret = avcodec_send_packet(m_codec_context, packet.GetPacket()); ret < 0) {
+        LOG_ERROR(HW_GPU, "avcodec_send_packet error: {}", AVError(ret));
+        return false;
+    }
+
+    return true;
+}
+
+std::unique_ptr<Frame> DecoderContext::ReceiveFrame(bool* out_is_interlaced) {
+    auto dst_frame = std::make_unique<Frame>();
+
+    const auto ReceiveImpl = [&](AVFrame* frame) {
+        if (const int ret = avcodec_receive_frame(m_codec_context, frame); ret < 0) {
+            LOG_ERROR(HW_GPU, "avcodec_receive_frame error: {}", AVError(ret));
+            return false;
+        }
+
+        *out_is_interlaced = frame->interlaced_frame != 0;
+        return true;
+    };
+
+    if (m_codec_context->hw_device_ctx) {
+        // If we have a hardware context, make a separate frame here to receive the
+        // hardware result before sending it to the output.
+        Frame intermediate_frame;
+
+        if (!ReceiveImpl(intermediate_frame.GetFrame())) {
+            return {};
+        }
+
+        dst_frame->SetFormat(PreferredGpuFormat);
+        if (const int ret =
+                av_hwframe_transfer_data(dst_frame->GetFrame(), intermediate_frame.GetFrame(), 0);
+            ret < 0) {
+            LOG_ERROR(HW_GPU, "av_hwframe_transfer_data error: {}", AVError(ret));
+            return {};
+        }
+    } else {
+        // Otherwise, decode the frame as normal.
+        if (!ReceiveImpl(dst_frame->GetFrame())) {
+            return {};
+        }
+    }
+
+    return dst_frame;
+}
+
+DeinterlaceFilter::DeinterlaceFilter(const Frame& frame) {
+    const AVFilter* buffer_src = avfilter_get_by_name("buffer");
+    const AVFilter* buffer_sink = avfilter_get_by_name("buffersink");
+    AVFilterInOut* inputs = avfilter_inout_alloc();
+    AVFilterInOut* outputs = avfilter_inout_alloc();
+    SCOPE_EXIT({
+        avfilter_inout_free(&inputs);
+        avfilter_inout_free(&outputs);
+    });
+
+    // Don't know how to get the accurate time_base but it doesn't matter for yadif filter
+    // so just use 1/1 to make buffer filter happy
+    std::string args = fmt::format("video_size={}x{}:pix_fmt={}:time_base=1/1", frame.GetWidth(),
+                                   frame.GetHeight(), static_cast<int>(frame.GetPixelFormat()));
+
+    m_filter_graph = avfilter_graph_alloc();
+    int ret = avfilter_graph_create_filter(&m_source_context, buffer_src, "in", args.c_str(),
+                                           nullptr, m_filter_graph);
+    if (ret < 0) {
+        LOG_ERROR(HW_GPU, "avfilter_graph_create_filter source error: {}", AVError(ret));
+        return;
+    }
+
+    ret = avfilter_graph_create_filter(&m_sink_context, buffer_sink, "out", nullptr, nullptr,
+                                       m_filter_graph);
+    if (ret < 0) {
+        LOG_ERROR(HW_GPU, "avfilter_graph_create_filter sink error: {}", AVError(ret));
+        return;
+    }
+
+    inputs->name = av_strdup("out");
+    inputs->filter_ctx = m_sink_context;
+    inputs->pad_idx = 0;
+    inputs->next = nullptr;
+
+    outputs->name = av_strdup("in");
+    outputs->filter_ctx = m_source_context;
+    outputs->pad_idx = 0;
+    outputs->next = nullptr;
+
+    const char* description = "yadif=1:-1:0";
+    ret = avfilter_graph_parse_ptr(m_filter_graph, description, &inputs, &outputs, nullptr);
+    if (ret < 0) {
+        LOG_ERROR(HW_GPU, "avfilter_graph_parse_ptr error: {}", AVError(ret));
+        return;
+    }
+
+    ret = avfilter_graph_config(m_filter_graph, nullptr);
+    if (ret < 0) {
+        LOG_ERROR(HW_GPU, "avfilter_graph_config error: {}", AVError(ret));
+        return;
+    }
+
+    m_initialized = true;
+}
+
+bool DeinterlaceFilter::AddSourceFrame(const Frame& frame) {
+    if (const int ret = av_buffersrc_add_frame_flags(m_source_context, frame.GetFrame(),
+                                                     AV_BUFFERSRC_FLAG_KEEP_REF);
+        ret < 0) {
+        LOG_ERROR(HW_GPU, "av_buffersrc_add_frame_flags error: {}", AVError(ret));
+        return false;
+    }
+
+    return true;
+}
+
+std::unique_ptr<Frame> DeinterlaceFilter::DrainSinkFrame() {
+    auto dst_frame = std::make_unique<Frame>();
+    const int ret = av_buffersink_get_frame(m_sink_context, dst_frame->GetFrame());
+
+    if (ret == AVERROR(EAGAIN) || ret == AVERROR(AVERROR_EOF)) {
+        return {};
+    }
+
+    if (ret < 0) {
+        LOG_ERROR(HW_GPU, "av_buffersink_get_frame error: {}", AVError(ret));
+        return {};
+    }
+
+    return dst_frame;
+}
+
+DeinterlaceFilter::~DeinterlaceFilter() {
+    avfilter_graph_free(&m_filter_graph);
+}
+
+void DecodeApi::Reset() {
+    m_deinterlace_filter.reset();
+    m_hardware_context.reset();
+    m_decoder_context.reset();
+    m_decoder.reset();
+}
+
+bool DecodeApi::Initialize(Tegra::Host1x::NvdecCommon::VideoCodec codec) {
+    this->Reset();
+    m_decoder.emplace(codec);
+    m_decoder_context.emplace(*m_decoder);
+
+    // Enable GPU decoding if requested.
+    if (Settings::values.nvdec_emulation.GetValue() == Settings::NvdecEmulation::Gpu) {
+        m_hardware_context.emplace();
+        m_hardware_context->InitializeForDecoder(*m_decoder_context, *m_decoder);
+    }
+
+    // Open the decoder context.
+    if (!m_decoder_context->OpenContext(*m_decoder)) {
+        this->Reset();
+        return false;
+    }
+
+    return true;
+}
+
+bool DecodeApi::SendPacket(std::span<const u8> packet_data, size_t configuration_size) {
+    FFmpeg::Packet packet(packet_data);
+    return m_decoder_context->SendPacket(packet);
+}
+
+void DecodeApi::ReceiveFrames(std::queue<std::unique_ptr<Frame>>& frame_queue) {
+    // Receive raw frame from decoder.
+    bool is_interlaced;
+    auto frame = m_decoder_context->ReceiveFrame(&is_interlaced);
+    if (!frame) {
+        return;
+    }
+
+    if (!is_interlaced) {
+        // If the frame is not interlaced, we can pend it now.
+        frame_queue.push(std::move(frame));
+    } else {
+        // Create the deinterlacer if needed.
+        if (!m_deinterlace_filter) {
+            m_deinterlace_filter.emplace(*frame);
+        }
+
+        // Add the frame we just received.
+        if (!m_deinterlace_filter->AddSourceFrame(*frame)) {
+            return;
+        }
+
+        // Pend output fields.
+        while (true) {
+            auto filter_frame = m_deinterlace_filter->DrainSinkFrame();
+            if (!filter_frame) {
+                break;
+            }
+
+            frame_queue.push(std::move(filter_frame));
+        }
+    }
+}
+
+} // namespace FFmpeg
diff --git a/src/video_core/host1x/ffmpeg/ffmpeg.h b/src/video_core/host1x/ffmpeg/ffmpeg.h
new file mode 100644
index 000000000..1de0bbd83
--- /dev/null
+++ b/src/video_core/host1x/ffmpeg/ffmpeg.h
@@ -0,0 +1,213 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <optional>
+#include <span>
+#include <vector>
+#include <queue>
+
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "video_core/host1x/nvdec_common.h"
+
+extern "C" {
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+
+#include <libavcodec/avcodec.h>
+#include <libavfilter/avfilter.h>
+#include <libavfilter/buffersink.h>
+#include <libavfilter/buffersrc.h>
+#include <libavutil/avutil.h>
+#include <libavutil/opt.h>
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
+}
+
+namespace FFmpeg {
+
+class Packet;
+class Frame;
+class Decoder;
+class HardwareContext;
+class DecoderContext;
+class DeinterlaceFilter;
+
+// Wraps an AVPacket, a container for compressed bitstream data.
+class Packet {
+public:
+    YUZU_NON_COPYABLE(Packet);
+    YUZU_NON_MOVEABLE(Packet);
+
+    explicit Packet(std::span<const u8> data);
+    ~Packet();
+
+    AVPacket* GetPacket() const {
+        return m_packet;
+    }
+
+private:
+    AVPacket* m_packet{};
+};
+
+// Wraps an AVFrame, a container for audio and video stream data.
+class Frame {
+public:
+    YUZU_NON_COPYABLE(Frame);
+    YUZU_NON_MOVEABLE(Frame);
+
+    explicit Frame();
+    ~Frame();
+
+    int GetWidth() const {
+        return m_frame->width;
+    }
+
+    int GetHeight() const {
+        return m_frame->height;
+    }
+
+    AVPixelFormat GetPixelFormat() const {
+        return static_cast<AVPixelFormat>(m_frame->format);
+    }
+
+    int GetStride(int plane) const {
+        return m_frame->linesize[plane];
+    }
+
+    int* GetStrides() const {
+        return m_frame->linesize;
+    }
+
+    u8* GetData(int plane) const {
+        return m_frame->data[plane];
+    }
+
+    u8** GetPlanes() const {
+        return m_frame->data;
+    }
+
+    void SetFormat(int format) {
+        m_frame->format = format;
+    }
+
+    AVFrame* GetFrame() const {
+        return m_frame;
+    }
+
+private:
+    AVFrame* m_frame{};
+};
+
+// Wraps an AVCodec, a type containing information about a codec.
+class Decoder {
+public:
+    YUZU_NON_COPYABLE(Decoder);
+    YUZU_NON_MOVEABLE(Decoder);
+
+    explicit Decoder(Tegra::Host1x::NvdecCommon::VideoCodec codec);
+    ~Decoder() = default;
+
+    bool SupportsDecodingOnDevice(AVPixelFormat* out_pix_fmt, AVHWDeviceType type) const;
+
+    const AVCodec* GetCodec() const {
+        return m_codec;
+    }
+
+private:
+    const AVCodec* m_codec{};
+};
+
+// Wraps AVBufferRef for an accelerated decoder.
+class HardwareContext {
+public:
+    YUZU_NON_COPYABLE(HardwareContext);
+    YUZU_NON_MOVEABLE(HardwareContext);
+
+    static std::vector<AVHWDeviceType> GetSupportedDeviceTypes();
+
+    explicit HardwareContext() = default;
+    ~HardwareContext();
+
+    bool InitializeForDecoder(DecoderContext& decoder_context, const Decoder& decoder);
+
+    AVBufferRef* GetBufferRef() const {
+        return m_gpu_decoder;
+    }
+
+private:
+    bool InitializeWithType(AVHWDeviceType type);
+
+    AVBufferRef* m_gpu_decoder{};
+};
+
+// Wraps an AVCodecContext.
+class DecoderContext {
+public:
+    YUZU_NON_COPYABLE(DecoderContext);
+    YUZU_NON_MOVEABLE(DecoderContext);
+
+    explicit DecoderContext(const Decoder& decoder);
+    ~DecoderContext();
+
+    void InitializeHardwareDecoder(const HardwareContext& context, AVPixelFormat hw_pix_fmt);
+    bool OpenContext(const Decoder& decoder);
+    bool SendPacket(const Packet& packet);
+    std::unique_ptr<Frame> ReceiveFrame(bool* out_is_interlaced);
+
+    AVCodecContext* GetCodecContext() const {
+        return m_codec_context;
+    }
+
+private:
+    AVCodecContext* m_codec_context{};
+};
+
+// Wraps an AVFilterGraph.
+class DeinterlaceFilter {
+public:
+    YUZU_NON_COPYABLE(DeinterlaceFilter);
+    YUZU_NON_MOVEABLE(DeinterlaceFilter);
+
+    explicit DeinterlaceFilter(const Frame& frame);
+    ~DeinterlaceFilter();
+
+    bool AddSourceFrame(const Frame& frame);
+    std::unique_ptr<Frame> DrainSinkFrame();
+
+private:
+    AVFilterGraph* m_filter_graph{};
+    AVFilterContext* m_source_context{};
+    AVFilterContext* m_sink_context{};
+    bool m_initialized{};
+};
+
+class DecodeApi {
+public:
+    YUZU_NON_COPYABLE(DecodeApi);
+    YUZU_NON_MOVEABLE(DecodeApi);
+
+    DecodeApi() = default;
+    ~DecodeApi() = default;
+
+    bool Initialize(Tegra::Host1x::NvdecCommon::VideoCodec codec);
+    void Reset();
+
+    bool SendPacket(std::span<const u8> packet_data, size_t configuration_size);
+    void ReceiveFrames(std::queue<std::unique_ptr<Frame>>& frame_queue);
+
+private:
+    std::optional<FFmpeg::Decoder> m_decoder;
+    std::optional<FFmpeg::DecoderContext> m_decoder_context;
+    std::optional<FFmpeg::HardwareContext> m_hardware_context;
+    std::optional<FFmpeg::DeinterlaceFilter> m_deinterlace_filter;
+};
+
+} // namespace FFmpeg