[android] Verifying the actual flag required on hardware access

src/android/app/src/main/jni/CMakeLists.txt

@@ -27,7 +27,7 @@ if (ARCHITECTURE_arm64)
     target_link_libraries(yuzu-android PRIVATE adrenotools)
 endif()
 
-target_link_libraries(yuzu-android PRIVATE OpenSSL::SSL cpp-jwt::cpp-jwt)
+target_link_libraries(yuzu-android PRIVATE ${FFmpeg_LIBRARIES} OpenSSL::SSL cpp-jwt::cpp-jwt)
 if (ENABLE_UPDATE_CHECKER)
     target_compile_definitions(yuzu-android PUBLIC ENABLE_UPDATE_CHECKER)
 endif()

src/android/app/src/main/jni/native.cpp

@@ -36,6 +36,10 @@
 #include <frontend_common/content_manager.h>
 #include <jni.h>
 
+extern "C" {
+#include <libavcodec/jni.h>
+}
+
 #include "common/android/multiplayer/multiplayer.h"
 #include "common/android/android_common.h"
 #include "common/android/id_cache.h"
@@ -680,6 +684,13 @@ const char* fallback_cpu_detection() {
 
 } // namespace
 
+extern "C" {
+jint InitFFmpegOnLoad(JavaVM* vm) {
+    av_jni_set_java_vm(vm, nullptr);
+    return 0;
+}
+}
+
 extern "C" {
 
 void Java_org_yuzu_yuzu_1emu_NativeLibrary_surfaceChanged(JNIEnv* env, jobject instance,

src/common/android/id_cache.cpp

@@ -123,10 +123,6 @@ namespace Common::Android {
         return owned.env;
     }
 
-    JavaVM *GetJavaVM() {
-        return s_java_vm;
-    }
-
     jclass GetNativeLibraryClass() {
         return s_native_library_class;
     }
@@ -431,8 +427,11 @@ namespace Common::Android {
     extern "C" {
 #endif
 
+    jint InitFFmpegOnLoad(JavaVM *vm);
+
     jint JNI_OnLoad(JavaVM *vm, void *reserved) {
         s_java_vm = vm;
+        InitFFmpegOnLoad(vm);
 
         JNIEnv *env;
         if (vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION) != JNI_OK)

src/common/android/id_cache.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #pragma once
@@ -12,7 +12,6 @@
 namespace Common::Android {
 
 JNIEnv* GetEnvForThread();
-JavaVM* GetJavaVM();
 
 /**
  * Starts a new thread to run JNI. Intended to be used when you must run JNI from a fiber.

src/video_core/host1x/codecs/decoder.cpp

@@ -20,58 +20,54 @@ Decoder::Decoder(Host1x::Host1x& host1x_, s32 id_, const Host1x::NvdecCommon::Nv
 
 Decoder::~Decoder() = default;
 
+void Decoder::SetFrameDimensions(s32 width, s32 height) {
+    if (width <= 0 || height <= 0) {
+        frame_dimensions.reset();
+        return;
+    }
+    frame_dimensions = FFmpeg::FrameDimensions{width, height};
+}
+
 void Decoder::Decode() {
     if (!initialized) {
         return;
     }
 
     const auto packet_data = ComposeFrame();
-    // Send assembled bitstream to decoder.
-    if (!decode_api.SendPacket(packet_data)) {
-        return;
-    }
-
-    // Only receive/store visible frames.
-    if (vp9_hidden_frame) {
-        return;
-    }
-
-    // Receive output frames from decoder.
-    auto frame = decode_api.ReceiveFrame();
-
-    if (!frame) {
-        return;
-    }
-
-    if (IsInterlaced()) {
-        auto [luma_top, luma_bottom, chroma_top, chroma_bottom] = GetInterlacedOffsets();
-        auto frame_copy = frame;
-
-        if (!frame.get()) {
-            LOG_ERROR(HW_GPU,
-                      "Nvdec {} failed to decode interlaced frame for top {:#X} bottom 0x{:X}", id,
-                      luma_top, luma_bottom);
-        }
-
-        if (UsingDecodeOrder()) {
-            host1x.frame_queue.PushDecodeOrder(id, luma_top, std::move(frame));
-            host1x.frame_queue.PushDecodeOrder(id, luma_bottom, std::move(frame_copy));
-        } else {
-            host1x.frame_queue.PushPresentOrder(id, luma_top, std::move(frame));
-            host1x.frame_queue.PushPresentOrder(id, luma_bottom, std::move(frame_copy));
-        }
+    FFmpeg::FrameOffsets offsets{};
+    offsets.hidden = vp9_hidden_frame;
+    offsets.interlaced = IsInterlaced();
+    if (offsets.interlaced) {
+        std::tie(offsets.luma, offsets.luma_bottom, std::ignore, std::ignore) =
+            GetInterlacedOffsets();
     } else {
-        auto [luma_offset, chroma_offset] = GetProgressiveOffsets();
+        std::tie(offsets.luma, std::ignore) = GetProgressiveOffsets();
+    }
 
-        if (!frame.get()) {
-            LOG_ERROR(HW_GPU, "Nvdec {} failed to decode progressive frame for luma {:#X}", id,
-                      luma_offset);
-        }
+    // Send assembled bitstream to decoder.
+    if (!decode_api.SendPacket(packet_data, offsets, GetFrameDimensions())) {
+        return;
+    }
 
+    auto push = [&](u64 luma, std::shared_ptr<FFmpeg::Frame> frame) {
         if (UsingDecodeOrder()) {
-            host1x.frame_queue.PushDecodeOrder(id, luma_offset, std::move(frame));
+            host1x.frame_queue.PushDecodeOrder(id, luma, std::move(frame));
         } else {
-            host1x.frame_queue.PushPresentOrder(id, luma_offset, std::move(frame));
+            host1x.frame_queue.PushPresentOrder(id, luma, std::move(frame));
+        }
+    };
+
+    while (auto result = decode_api.ReceiveFrame()) {
+        auto& [frame, frame_offsets] = *result;
+        if (frame_offsets.hidden || !frame) {
+            continue;
+        }
+        if (frame_offsets.interlaced) {
+            auto frame_copy = frame;
+            push(frame_offsets.luma, std::move(frame));
+            push(frame_offsets.luma_bottom, std::move(frame_copy));
+        } else {
+            push(frame_offsets.luma, std::move(frame));
         }
     }
 }

src/video_core/host1x/codecs/decoder.h

@@ -10,6 +10,7 @@
 #include <mutex>
 #include <optional>
 #include <string_view>
+#include <tuple>
 #include <ankerl/unordered_dense.h>
 #include <queue>
 
@@ -46,12 +47,19 @@ protected:
     virtual std::tuple<u64, u64, u64, u64> GetInterlacedOffsets() = 0;
     virtual bool IsInterlaced() = 0;
 
+    void SetFrameDimensions(s32 width, s32 height);
+
+    std::optional<FFmpeg::FrameDimensions> GetFrameDimensions() const {
+        return frame_dimensions;
+    }
+
     FFmpeg::DecodeApi decode_api;
     Host1x::Host1x& host1x;
     const Host1x::NvdecCommon::NvdecRegisters& regs;
     s32 id;
     bool initialized : 1 = false;
     bool vp9_hidden_frame : 1 = false;
+    std::optional<FFmpeg::FrameDimensions> frame_dimensions;
 };
 
 } // namespace Tegra

src/video_core/host1x/codecs/h264.cpp

@@ -52,6 +52,10 @@ bool H264::IsInterlaced() {
 
 std::span<const u8> H264::ComposeFrame() {
     host1x.gmmu_manager.ReadBlock(regs.picture_info_offset.Address(), &current_context, sizeof(H264DecoderContext));
+    const auto& params = current_context.h264_parameter_set;
+    SetFrameDimensions(static_cast<s32>(params.pic_width_in_mbs) * 16,
+                       static_cast<s32>(params.frame_height_in_mbs) * 16);
+
     const s64 frame_number = current_context.h264_parameter_set.frame_number.Value();
     if (!is_first_frame && frame_number != 0) {
         frame_scratch.resize_destructive(current_context.stream_len);

src/video_core/host1x/codecs/vp8.cpp

@@ -35,6 +35,7 @@ std::tuple<u64, u64, u64, u64> VP8::GetInterlacedOffsets() {
 
 std::span<const u8> VP8::ComposeFrame() {
     host1x.gmmu_manager.ReadBlock(regs.picture_info_offset.Address(), &current_context, sizeof(VP8PictureInfo));
+    SetFrameDimensions(current_context.frame_width, current_context.frame_height);
 
     const bool is_key_frame = current_context.key_frame == 1u;
     const auto bitstream_size = size_t(current_context.vld_buffer_size);

src/video_core/host1x/codecs/vp9.cpp

@@ -841,6 +841,7 @@ std::span<const u8> VP9::ComposeFrame() {
     {
         Vp9FrameContainer curr_frame = GetCurrentFrame();
         current_frame_info = curr_frame.info;
+        SetFrameDimensions(current_frame_info.frame_size.width, current_frame_info.frame_size.height);
         bitstream = std::move(curr_frame.bit_stream);
     }
     // The uncompressed header routine sets PrevProb parameters needed for the compressed header

src/video_core/host1x/ffmpeg.cpp

@@ -4,6 +4,10 @@
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <cstring>
+#include <string_view>
+#include <vector>
+
 #include "common/assert.h"
 #include "common/logging.h"
 #include "common/scope_exit.h"
@@ -19,16 +23,8 @@ extern "C" {
 #endif
 
 #include <libavutil/hwcontext.h>
-
-#if defined(__ANDROID__)
-#include <libavcodec/jni.h>
-#endif
 }
 
-#if defined(__ANDROID__)
-#include "common/android/id_cache.h"
-#endif
-
 namespace FFmpeg {
 
 namespace {
@@ -92,6 +88,52 @@ std::string AVError(int errnum) {
     return errbuf;
 }
 
+#if defined(__ANDROID__)
+size_t FindNalStartCode(std::span<const u8> data, size_t i) {
+    const size_t n = data.size();
+    if (i + 3 < n && data[i] == 0 && data[i + 1] == 0 && data[i + 2] == 0 && data[i + 3] == 1) {
+        return 4;
+    }
+    if (i + 2 < n && data[i] == 0 && data[i + 1] == 0 && data[i + 2] == 1) {
+        return 3;
+    }
+    return 0;
+}
+
+std::vector<u8> ExtractH264ParameterSetExtradata(std::span<const u8> packet) {
+    std::vector<u8> extradata;
+    const size_t size = packet.size();
+    size_t i = 0;
+    while (i < size) {
+        const size_t sc = FindNalStartCode(packet, i);
+        if (sc == 0) {
+            ++i;
+            continue;
+        }
+        const size_t nal_start = i + sc;
+        if (nal_start >= size) {
+            break;
+        }
+        const u8 nal_type = packet[nal_start] & 0x1F;
+
+        size_t j = nal_start + 1;
+        while (j < size && FindNalStartCode(packet, j) == 0) {
+            ++j;
+        }
+
+        if (nal_type == 7 || nal_type == 8) {
+            constexpr u8 start[4] = {0, 0, 0, 1};
+            extradata.insert(extradata.end(), start, start + sizeof(start));
+            extradata.insert(extradata.end(), packet.begin() + nal_start, packet.begin() + j);
+        } else if (nal_type == 1 || nal_type == 5) {
+            break;
+        }
+        i = j;
+    }
+    return extradata;
+}
+#endif
+
 }
 
 Packet::Packet(std::span<const u8> data) {
@@ -126,7 +168,24 @@ Decoder::Decoder(Tegra::Host1x::NvdecCommon::VideoCodec codec) {
             return AV_CODEC_ID_NONE;
         }
     }();
-    m_codec = avcodec_find_decoder(av_codec);
+
+#if defined(__ANDROID__)
+    if (Settings::values.nvdec_emulation.GetValue() == Settings::NvdecEmulation::Gpu) {
+        const char* mc_name = nullptr;
+        switch (av_codec) {
+        case AV_CODEC_ID_H264: mc_name = "h264_mediacodec"; break;
+        case AV_CODEC_ID_VP8:  mc_name = "vp8_mediacodec";  break;
+        case AV_CODEC_ID_VP9:  mc_name = "vp9_mediacodec";  break;
+        default: break;
+        }
+        if (mc_name) {
+            m_codec = avcodec_find_decoder_by_name(mc_name);
+        }
+    }
+#endif
+    if (!m_codec) {
+        m_codec = avcodec_find_decoder(av_codec);
+    }
 }
 
 bool Decoder::SupportsDecodingOnDevice(AVPixelFormat* out_pix_fmt, AVHWDeviceType type) const {
@@ -222,6 +281,8 @@ DecoderContext::DecoderContext(const Decoder& decoder) : m_decoder{decoder} {
     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;
+    m_codec_context->flags |= AV_CODEC_FLAG_LOW_DELAY;
+    m_codec_context->flags2 |= AV_CODEC_FLAG2_FAST;
 }
 
 DecoderContext::~DecoderContext() {
@@ -235,7 +296,19 @@ void DecoderContext::InitializeHardwareDecoder(const HardwareContext& context, A
     m_codec_context->pix_fmt = hw_pix_fmt;
 }
 
-bool DecoderContext::OpenContext(const Decoder& decoder) {
+bool DecoderContext::OpenContext(const Decoder& decoder, std::span<const u8> extradata) {
+    if (!extradata.empty()) {
+        av_freep(&m_codec_context->extradata);
+        m_codec_context->extradata = static_cast<u8*>(
+            av_mallocz(extradata.size() + AV_INPUT_BUFFER_PADDING_SIZE));
+        if (!m_codec_context->extradata) {
+            LOG_ERROR(HW_GPU, "Failed to allocate extradata");
+            return false;
+        }
+        std::memcpy(m_codec_context->extradata, extradata.data(), extradata.size());
+        m_codec_context->extradata_size = static_cast<int>(extradata.size());
+    }
+
     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;
@@ -289,6 +362,13 @@ void DecodeApi::Reset() {
     m_hardware_context.reset();
     m_decoder_context.reset();
     m_decoder.reset();
+    m_opened = false;
+    m_defer_android_mediacodec_open = false;
+    m_needs_h264_extradata = false;
+    m_next_pts = 0;
+    while (!m_pending_offsets.empty()) {
+        m_pending_offsets.pop();
+    }
 }
 
 bool DecodeApi::Initialize(Tegra::Host1x::NvdecCommon::VideoCodec codec) {
@@ -298,32 +378,82 @@ bool DecodeApi::Initialize(Tegra::Host1x::NvdecCommon::VideoCodec codec) {
 
     // Enable GPU decoding if requested.
     if (Settings::values.nvdec_emulation.GetValue() == Settings::NvdecEmulation::Gpu) {
-#if defined(__ANDROID__)
-        static const int jni_vm_result =
-            av_jni_set_java_vm(Common::Android::GetJavaVM(), nullptr);
-        (void)jni_vm_result;
-#endif
         m_hardware_context.emplace();
         m_hardware_context->InitializeForDecoder(*m_decoder_context, *m_decoder);
     }
 
+#if defined(__ANDROID__)
+    const std::string_view decoder_name = m_decoder->GetCodec() ? m_decoder->GetCodec()->name : "";
+
+    m_defer_android_mediacodec_open = decoder_name == "h264_mediacodec" ||
+                                      decoder_name == "vp8_mediacodec" ||
+                                      decoder_name == "vp9_mediacodec";
+
+    m_needs_h264_extradata = decoder_name == "h264_mediacodec";
+    if (m_defer_android_mediacodec_open) {
+        return true;
+    }
+#endif
+
     // Open the decoder context.
     if (!m_decoder_context->OpenContext(*m_decoder)) {
         this->Reset();
         return false;
     }
+    m_opened = true;
 
     return true;
 }
 
-bool DecodeApi::SendPacket(std::span<const u8> packet_data) {
+bool DecodeApi::SendPacket(std::span<const u8> packet_data, const FrameOffsets& offsets,
+                           std::optional<FrameDimensions> dimensions) {
+    if (!m_opened) {
+        std::vector<u8> extradata;
+#if defined(__ANDROID__)
+        if (m_defer_android_mediacodec_open) {
+            if (!dimensions) {
+                return true;
+            }
+
+            auto* ctx = m_decoder_context->GetCodecContext();
+            ctx->width = dimensions->width;
+            ctx->height = dimensions->height;
+            ctx->coded_width = dimensions->width;
+            ctx->coded_height = dimensions->height;
+        }
+
+        if (m_needs_h264_extradata) {
+            extradata = ExtractH264ParameterSetExtradata(packet_data);
+            if (extradata.empty()) {
+                return true;
+            }
+        }
+#endif
+        if (!m_decoder_context->OpenContext(*m_decoder, extradata)) {
+            this->Reset();
+            return false;
+        }
+        m_opened = true;
+    }
+    m_pending_offsets.push(offsets);
     FFmpeg::Packet packet(packet_data);
+    packet.GetPacket()->pts = m_next_pts;
+    packet.GetPacket()->dts = m_next_pts;
+    ++m_next_pts;
     return m_decoder_context->SendPacket(packet);
 }
 
-std::shared_ptr<Frame> DecodeApi::ReceiveFrame() {
-    // Receive raw frame from decoder.
-    return m_decoder_context->ReceiveFrame();
+std::optional<DecodeApi::DecodedFrame> DecodeApi::ReceiveFrame() {
+    auto frame = m_decoder_context->ReceiveFrame();
+    if (!frame) {
+        return std::nullopt;
+    }
+    FrameOffsets offsets{};
+    if (!m_pending_offsets.empty()) {
+        offsets = m_pending_offsets.front();
+        m_pending_offsets.pop();
+    }
+    return DecodedFrame{std::move(frame), offsets};
 }
 
 }

src/video_core/host1x/ffmpeg.h

@@ -179,7 +179,7 @@ public:
     ~DecoderContext();
 
     void InitializeHardwareDecoder(const HardwareContext& context, AVPixelFormat hw_pix_fmt);
-    bool OpenContext(const Decoder& decoder);
+    bool OpenContext(const Decoder& decoder, std::span<const u8> extradata = {});
     bool SendPacket(const Packet& packet);
     std::shared_ptr<Frame> ReceiveFrame();
 
@@ -198,6 +198,18 @@ private:
     bool m_decode_order{};
 };
 
+struct FrameOffsets {
+    bool interlaced{};
+    bool hidden{};
+    u64 luma{};
+    u64 luma_bottom{};
+};
+
+struct FrameDimensions {
+    s32 width{};
+    s32 height{};
+};
+
 class DecodeApi {
 public:
     YUZU_NON_COPYABLE(DecodeApi);
@@ -213,13 +225,24 @@ public:
         return m_decoder_context->UsingDecodeOrder();
     }
 
-    bool SendPacket(std::span<const u8> packet_data);
-    std::shared_ptr<Frame> ReceiveFrame();
+    bool SendPacket(std::span<const u8> packet_data, const FrameOffsets& offsets,
+                    std::optional<FrameDimensions> dimensions = std::nullopt);
+
+    struct DecodedFrame {
+        std::shared_ptr<Frame> frame;
+        FrameOffsets offsets;
+    };
+    std::optional<DecodedFrame> ReceiveFrame();
 
 private:
     std::optional<FFmpeg::Decoder> m_decoder;
     std::optional<FFmpeg::DecoderContext> m_decoder_context;
     std::optional<FFmpeg::HardwareContext> m_hardware_context;
+    bool m_opened{};
+    bool m_defer_android_mediacodec_open{};
+    bool m_needs_h264_extradata{};
+    s64 m_next_pts{};
+    std::queue<FrameOffsets> m_pending_offsets;
 };
 
 } // namespace FFmpeg

src/video_core/host1x/nvdec.cpp

@@ -31,6 +31,7 @@ Nvdec::Nvdec(Host1x& host1x_, s32 id_, u32 syncpt)
 
 Nvdec::~Nvdec() {
     LOG_INFO(HW_GPU, "Destroying nvdec {}", id);
+    host1x.frame_queue.Close(id);
 }
 
 void Nvdec::ProcessMethod(u32 method, u32 argument) {

src/video_core/host1x/vic.cpp

@@ -118,6 +118,7 @@ void Vic::Execute() noexcept {
     output_surface.resize(output_width * output_height);
 
     if (Settings::values.nvdec_emulation.GetValue() != Settings::NvdecEmulation::Off) {
+        bool decoded_frame = false;
         for (size_t i = 0; i < config.slot_structs.size(); i++) {
             if (auto& slot_config = config.slot_structs[i]; slot_config.config.slot_enable) {
                 auto const luma_offset = regs.surfaces[i][SurfaceIndex::Current].luma.Address();
@@ -136,11 +137,17 @@ void Vic::Execute() noexcept {
                         break;
                     }
                     Blend(config, slot_config, config.output_surface_config.out_pixel_format);
+                    decoded_frame = true;
                 } else {
-                    LOG_ERROR(HW_GPU, "Vic {} failed to get frame with offset {:#X}", id, luma_offset);
+                    LOG_TRACE(HW_GPU, "Vic {} failed to get frame with offset {:#X}", id, luma_offset);
                 }
             }
         }
+        if (decoded_frame) {
+            has_decoded_frame = true;
+        } else if (!has_decoded_frame) {
+            return;
+        }
     } else {
         // Fill the frame with black, as otherwise they can have random data and be very glitchy.
         std::fill(output_surface.begin(), output_surface.end(), Pixel{});

src/video_core/host1x/vic.h

@@ -628,6 +628,7 @@ private:
 
     s32 id;
     s32 nvdec_id{-1};
+    bool has_decoded_frame{};
     u32 syncpoint;
 };