14 files changed, 1520 insertions, 172 deletions

diff --git a/src/citra/config.cpp b/src/citra/config.cpp
index 827c90e55..fac1c9a0e 100644
--- a/src/citra/config.cpp
+++ b/src/citra/config.cpp
@@ -93,6 +93,21 @@ void Config::ReadValues() {
     Settings::values.region_value =
         sdl2_config->GetInteger("System", "region_value", Settings::REGION_VALUE_AUTO_SELECT);
 
+    // Camera
+    using namespace Service::CAM;
+    Settings::values.camera_name[OuterRightCamera] =
+        sdl2_config->Get("Camera", "camera_outer_right_name", "blank");
+    Settings::values.camera_config[OuterRightCamera] =
+        sdl2_config->Get("Camera", "camera_outer_right_config", "");
+    Settings::values.camera_name[InnerCamera] =
+        sdl2_config->Get("Camera", "camera_inner_name", "blank");
+    Settings::values.camera_config[InnerCamera] =
+        sdl2_config->Get("Camera", "camera_inner_config", "");
+    Settings::values.camera_name[OuterLeftCamera] =
+        sdl2_config->Get("Camera", "camera_outer_left_name", "blank");
+    Settings::values.camera_config[OuterLeftCamera] =
+        sdl2_config->Get("Camera", "camera_outer_left_config", "");
+
     // Miscellaneous
     Settings::values.log_filter = sdl2_config->Get("Miscellaneous", "log_filter", "*:Info");
 
diff --git a/src/citra/default_ini.h b/src/citra/default_ini.h
index d728fb9e8..435ba6f00 100644
--- a/src/citra/default_ini.h
+++ b/src/citra/default_ini.h
@@ -109,6 +109,22 @@ is_new_3ds =
 # -1: Auto-select (default), 0: Japan, 1: USA, 2: Europe, 3: Australia, 4: China, 5: Korea, 6: Taiwan
 region_value =
 
+[Camera]
+# Which camera engine to use for the right outer camera
+# blank (default): a dummy camera that always returns black image
+camera_outer_right_name =
+
+# A config string for the right outer camera. Its meaning is defined by the camera engine
+camera_outer_right_config =
+
+# ... for the left outer camera
+camera_outer_left_name =
+camera_outer_left_config =
+
+# ... for the inner camera
+camera_inner_name =
+camera_inner_config =
+
 [Miscellaneous]
 # A filter which removes logs below a certain logging level.
 # Examples: *:Debug Kernel.SVC:Trace Service.*:Critical
diff --git a/src/citra_qt/config.cpp b/src/citra_qt/config.cpp
index f776e16b2..b65f57fdc 100644
--- a/src/citra_qt/config.cpp
+++ b/src/citra_qt/config.cpp
@@ -67,6 +67,22 @@ void Config::ReadValues() {
         qt_config->value("output_device", "auto").toString().toStdString();
     qt_config->endGroup();
 
+    using namespace Service::CAM;
+    qt_config->beginGroup("Camera");
+    Settings::values.camera_name[OuterRightCamera] =
+        qt_config->value("camera_outer_right_name", "blank").toString().toStdString();
+    Settings::values.camera_config[OuterRightCamera] =
+        qt_config->value("camera_outer_right_config", "").toString().toStdString();
+    Settings::values.camera_name[InnerCamera] =
+        qt_config->value("camera_inner_name", "blank").toString().toStdString();
+    Settings::values.camera_config[InnerCamera] =
+        qt_config->value("camera_inner_config", "").toString().toStdString();
+    Settings::values.camera_name[OuterLeftCamera] =
+        qt_config->value("camera_outer_left_name", "blank").toString().toStdString();
+    Settings::values.camera_config[OuterLeftCamera] =
+        qt_config->value("camera_outer_left_config", "").toString().toStdString();
+    qt_config->endGroup();
+
     qt_config->beginGroup("Data Storage");
     Settings::values.use_virtual_sd = qt_config->value("use_virtual_sd", true).toBool();
     qt_config->endGroup();
@@ -174,6 +190,22 @@ void Config::SaveValues() {
     qt_config->setValue("output_device", QString::fromStdString(Settings::values.audio_device_id));
     qt_config->endGroup();
 
+    using namespace Service::CAM;
+    qt_config->beginGroup("Camera");
+    qt_config->setValue("camera_outer_right_name",
+                        QString::fromStdString(Settings::values.camera_name[OuterRightCamera]));
+    qt_config->setValue("camera_outer_right_config",
+                        QString::fromStdString(Settings::values.camera_config[OuterRightCamera]));
+    qt_config->setValue("camera_inner_name",
+                        QString::fromStdString(Settings::values.camera_name[InnerCamera]));
+    qt_config->setValue("camera_inner_config",
+                        QString::fromStdString(Settings::values.camera_config[InnerCamera]));
+    qt_config->setValue("camera_outer_left_name",
+                        QString::fromStdString(Settings::values.camera_name[OuterLeftCamera]));
+    qt_config->setValue("camera_outer_left_config",
+                        QString::fromStdString(Settings::values.camera_config[OuterLeftCamera]));
+    qt_config->endGroup();
+
     qt_config->beginGroup("Data Storage");
     qt_config->setValue("use_virtual_sd", Settings::values.use_virtual_sd);
     qt_config->endGroup();
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index faad0a561..bd0e3c595 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -29,6 +29,9 @@ set(SRCS
             file_sys/ivfc_archive.cpp
             file_sys/path_parser.cpp
             file_sys/savedata_archive.cpp
+            frontend/camera/blank_camera.cpp
+            frontend/camera/factory.cpp
+            frontend/camera/interface.cpp
             frontend/emu_window.cpp
             frontend/key_map.cpp
             frontend/motion_emu.cpp
@@ -203,6 +206,9 @@ set(HEADERS
             file_sys/ivfc_archive.h
             file_sys/path_parser.h
             file_sys/savedata_archive.h
+            frontend/camera/blank_camera.h
+            frontend/camera/factory.h
+            frontend/camera/interface.h
             frontend/emu_window.h
             frontend/key_map.h
             frontend/motion_emu.h
diff --git a/src/core/frontend/camera/blank_camera.cpp b/src/core/frontend/camera/blank_camera.cpp
new file mode 100644
index 000000000..7995abcbd
--- /dev/null
+++ b/src/core/frontend/camera/blank_camera.cpp
@@ -0,0 +1,31 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/frontend/camera/blank_camera.h"
+
+namespace Camera {
+
+void BlankCamera::StartCapture() {}
+
+void BlankCamera::StopCapture() {}
+
+void BlankCamera::SetFormat(Service::CAM::OutputFormat output_format) {
+    output_rgb = output_format == Service::CAM::OutputFormat::RGB565;
+}
+
+void BlankCamera::SetResolution(const Service::CAM::Resolution& resolution) {
+    width = resolution.width;
+    height = resolution.height;
+};
+
+void BlankCamera::SetFlip(Service::CAM::Flip) {}
+
+void BlankCamera::SetEffect(Service::CAM::Effect) {}
+
+std::vector<u16> BlankCamera::ReceiveFrame() const {
+    // Note: 0x80008000 stands for two black pixels in YUV422
+    return std::vector<u16>(width * height, output_rgb ? 0 : 0x8000);
+}
+
+} // namespace Camera
diff --git a/src/core/frontend/camera/blank_camera.h b/src/core/frontend/camera/blank_camera.h
new file mode 100644
index 000000000..c6619bd88
--- /dev/null
+++ b/src/core/frontend/camera/blank_camera.h
@@ -0,0 +1,28 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/frontend/camera/factory.h"
+#include "core/frontend/camera/interface.h"
+
+namespace Camera {
+
+class BlankCamera final : public CameraInterface {
+public:
+    void StartCapture() override;
+    void StopCapture() override;
+    void SetResolution(const Service::CAM::Resolution&) override;
+    void SetFlip(Service::CAM::Flip) override;
+    void SetEffect(Service::CAM::Effect) override;
+    void SetFormat(Service::CAM::OutputFormat) override;
+    std::vector<u16> ReceiveFrame() const override;
+
+private:
+    int width = 0;
+    int height = 0;
+    bool output_rgb = false;
+};
+
+} // namespace Camera
diff --git a/src/core/frontend/camera/factory.cpp b/src/core/frontend/camera/factory.cpp
new file mode 100644
index 000000000..4b4da50dd
--- /dev/null
+++ b/src/core/frontend/camera/factory.cpp
@@ -0,0 +1,32 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <unordered_map>
+#include "common/logging/log.h"
+#include "core/frontend/camera/blank_camera.h"
+#include "core/frontend/camera/factory.h"
+
+namespace Camera {
+
+static std::unordered_map<std::string, std::unique_ptr<CameraFactory>> factories;
+
+CameraFactory::~CameraFactory() = default;
+
+void RegisterFactory(const std::string& name, std::unique_ptr<CameraFactory> factory) {
+    factories[name] = std::move(factory);
+}
+
+std::unique_ptr<CameraInterface> CreateCamera(const std::string& name, const std::string& config) {
+    auto pair = factories.find(name);
+    if (pair != factories.end()) {
+        return pair->second->Create(config);
+    }
+
+    if (name != "blank") {
+        LOG_ERROR(Service_CAM, "Unknown camera \"%s\"", name.c_str());
+    }
+    return std::make_unique<BlankCamera>();
+}
+
+} // namespace Camera
diff --git a/src/core/frontend/camera/factory.h b/src/core/frontend/camera/factory.h
new file mode 100644
index 000000000..d68be16e5
--- /dev/null
+++ b/src/core/frontend/camera/factory.h
@@ -0,0 +1,41 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include "core/frontend/camera/interface.h"
+
+namespace Camera {
+
+class CameraFactory {
+public:
+    virtual ~CameraFactory();
+
+    /**
+     * Creates a camera object based on the configuration string.
+     * @params config Configuration string to create the camera. The implementation can decide the
+     *     meaning of this string.
+     * @returns a unique_ptr to the created camera object.
+     */
+    virtual std::unique_ptr<CameraInterface> Create(const std::string& config) const = 0;
+};
+
+/**
+ * Registers an external camera factory.
+ * @param name Identifier of the camera factory.
+ * @param factory Camera factory to register.
+ */
+void RegisterFactory(const std::string& name, std::unique_ptr<CameraFactory> factory);
+
+/**
+ * Creates a camera from the factory.
+ * @param name Identifier of the camera factory.
+ * @param config Configuration string to create the camera. The meaning of this string is
+ *     defined by the factory.
+ */
+std::unique_ptr<CameraInterface> CreateCamera(const std::string& name, const std::string& config);
+
+} // namespace Camera
diff --git a/src/core/frontend/camera/interface.cpp b/src/core/frontend/camera/interface.cpp
new file mode 100644
index 000000000..9aec9e7f1
--- /dev/null
+++ b/src/core/frontend/camera/interface.cpp
@@ -0,0 +1,11 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/frontend/camera/interface.h"
+
+namespace Camera {
+
+CameraInterface::~CameraInterface() = default;
+
+} // namespace Camera
diff --git a/src/core/frontend/camera/interface.h b/src/core/frontend/camera/interface.h
new file mode 100644
index 000000000..a55a495c9
--- /dev/null
+++ b/src/core/frontend/camera/interface.h
@@ -0,0 +1,61 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+#include "common/common_types.h"
+#include "core/hle/service/cam/cam.h"
+
+namespace Camera {
+
+/// An abstract class standing for a camera. All camera implementations should inherit from this.
+class CameraInterface {
+public:
+    virtual ~CameraInterface();
+
+    /// Starts the camera for video capturing.
+    virtual void StartCapture() = 0;
+
+    /// Stops the camera for video capturing.
+    virtual void StopCapture() = 0;
+
+    /**
+     * Sets the video resolution from raw CAM service parameters.
+     * For the meaning of the parameters, please refer to Service::CAM::Resolution. Note that the
+     * actual camera implementation doesn't need to respect all the parameters. However, the width
+     * and the height parameters must be respected and be used to determine the size of output
+     * frames.
+     * @param resolution The resolution parameters to set
+     */
+    virtual void SetResolution(const Service::CAM::Resolution& resolution) = 0;
+
+    /**
+     * Configures how received frames should be flipped by the camera.
+     * @param flip Flip applying to the frame
+     */
+    virtual void SetFlip(Service::CAM::Flip flip) = 0;
+
+    /**
+     * Configures what effect should be applied to received frames by the camera.
+     * @param effect Effect applying to the frame
+     */
+    virtual void SetEffect(Service::CAM::Effect effect) = 0;
+
+    /**
+     * Sets the output format of the all frames received after this function is called.
+     * @param format Output format of the frame
+     */
+    virtual void SetFormat(Service::CAM::OutputFormat format) = 0;
+
+    /**
+     * Receives a frame from the camera.
+     * This function should be only called between a StartCapture call and a StopCapture call.
+     * @returns A std::vector<u16> containing pixels. The total size of the vector is width * height
+     *     where width and height are set by a call to SetResolution.
+     */
+    virtual std::vector<u16> ReceiveFrame() const = 0;
+};
+
+} // namespace Camera
diff --git a/src/core/hle/service/cam/cam.cpp b/src/core/hle/service/cam/cam.cpp
index 5594aedab..95665e754 100644
--- a/src/core/hle/service/cam/cam.cpp
+++ b/src/core/hle/service/cam/cam.cpp
@@ -2,7 +2,15 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <algorithm>
+#include <array>
+#include <future>
+#include <memory>
+#include <vector>
+#include "common/bit_set.h"
 #include "common/logging/log.h"
+#include "core/core_timing.h"
+#include "core/frontend/camera/factory.h"
 #include "core/hle/kernel/event.h"
 #include "core/hle/service/cam/cam.h"
 #include "core/hle/service/cam/cam_c.h"
@@ -10,206 +18,924 @@
 #include "core/hle/service/cam/cam_s.h"
 #include "core/hle/service/cam/cam_u.h"
 #include "core/hle/service/service.h"
+#include "core/settings.h"
 
 namespace Service {
 namespace CAM {
 
-static const u32 TRANSFER_BYTES = 5 * 1024;
+namespace {
+
+struct ContextConfig {
+    Flip flip;
+    Effect effect;
+    OutputFormat format;
+    Resolution resolution;
+};
+
+struct CameraConfig {
+    std::unique_ptr<Camera::CameraInterface> impl;
+    std::array<ContextConfig, 2> contexts;
+    int current_context;
+    FrameRate frame_rate;
+};
+
+struct PortConfig {
+    int camera_id;
+
+    bool is_active;            // set when the port is activated by an Activate call.
+    bool is_pending_receiving; // set if SetReceiving is called when is_busy = false. When
+                               // StartCapture is called then, this will trigger a receiving
+                               // process and reset itself.
+    bool is_busy;      // set when StartCapture is called and reset when StopCapture is called.
+    bool is_receiving; // set when there is an ongoing receiving process.
+
+    bool is_trimming;
+    u16 x0; // x-coordinate of starting position for trimming
+    u16 y0; // y-coordinate of starting position for trimming
+    u16 x1; // x-coordinate of ending position for trimming
+    u16 y1; // y-coordinate of ending position for trimming
+
+    u32 transfer_bytes;
+
+    Kernel::SharedPtr<Kernel::Event> completion_event;
+    Kernel::SharedPtr<Kernel::Event> buffer_error_interrupt_event;
+    Kernel::SharedPtr<Kernel::Event> vsync_interrupt_event;
+
+    std::future<std::vector<u16>> capture_result; // will hold the received frame.
+    VAddr dest;                                   // the destination address of a receiving process
+    u32 dest_size;                                // the destination size of a receiving process
+
+    void Clear() {
+        completion_event->Clear();
+        buffer_error_interrupt_event->Clear();
+        vsync_interrupt_event->Clear();
+        is_receiving = false;
+        is_active = false;
+        is_pending_receiving = false;
+        is_busy = false;
+        is_trimming = false;
+        x0 = 0;
+        y0 = 0;
+        x1 = 0;
+        y1 = 0;
+        transfer_bytes = 256;
+    }
+};
+
+// built-in resolution parameters
+constexpr std::array<Resolution, 8> PRESET_RESOLUTION{{
+    {640, 480, 0, 0, 639, 479},  // VGA
+    {320, 240, 0, 0, 639, 479},  // QVGA
+    {160, 120, 0, 0, 639, 479},  // QQVGA
+    {352, 288, 26, 0, 613, 479}, // CIF
+    {176, 144, 26, 0, 613, 479}, // QCIF
+    {256, 192, 0, 0, 639, 479},  // DS_LCD
+    {512, 384, 0, 0, 639, 479},  // DS_LCDx4
+    {400, 240, 0, 48, 639, 431}, // CTR_TOP_LCD
+}};
+
+// latency in ms for each frame rate option
+constexpr std::array<int, 13> LATENCY_BY_FRAME_RATE{{
+    67,  // Rate_15
+    67,  // Rate_15_To_5
+    67,  // Rate_15_To_2
+    100, // Rate_10
+    118, // Rate_8_5
+    200, // Rate_5
+    50,  // Rate_20
+    50,  // Rate_20_To_5
+    33,  // Rate_30
+    33,  // Rate_30_To_5
+    67,  // Rate_15_To_10
+    50,  // Rate_20_To_10
+    33,  // Rate_30_To_10
+}};
+
+std::array<CameraConfig, NumCameras> cameras;
+std::array<PortConfig, 2> ports;
+int completion_event_callback;
+
+const ResultCode ERROR_INVALID_ENUM_VALUE(ErrorDescription::InvalidEnumValue, ErrorModule::CAM,
+                                          ErrorSummary::InvalidArgument, ErrorLevel::Usage);
+const ResultCode ERROR_OUT_OF_RANGE(ErrorDescription::OutOfRange, ErrorModule::CAM,
+                                    ErrorSummary::InvalidArgument, ErrorLevel::Usage);
+
+void CompletionEventCallBack(u64 port_id, int) {
+    PortConfig& port = ports[port_id];
+    const CameraConfig& camera = cameras[port.camera_id];
+    const auto buffer = port.capture_result.get();
+
+    if (port.is_trimming) {
+        u32 trim_width;
+        u32 trim_height;
+        const int original_width = camera.contexts[camera.current_context].resolution.width;
+        const int original_height = camera.contexts[camera.current_context].resolution.height;
+        if (port.x1 <= port.x0 || port.y1 <= port.y0 || port.x1 > original_width ||
+            port.y1 > original_height) {
+            LOG_ERROR(Service_CAM, "Invalid trimming coordinates x0=%u, y0=%u, x1=%u, y1=%u",
+                      port.x0, port.y0, port.x1, port.y1);
+            trim_width = 0;
+            trim_height = 0;
+        } else {
+            trim_width = port.x1 - port.x0;
+            trim_height = port.y1 - port.y0;
+        }
+
+        u32 trim_size = (port.x1 - port.x0) * (port.y1 - port.y0) * 2;
+        if (port.dest_size != trim_size) {
+            LOG_ERROR(Service_CAM, "The destination size (%u) doesn't match the source (%u)!",
+                      port.dest_size, trim_size);
+        }
+
+        const u32 src_offset = port.y0 * original_width + port.x0;
+        const u16* src_ptr = buffer.data() + src_offset;
+        // Note: src_size_left is int because it can be negative if the buffer size doesn't match.
+        int src_size_left = static_cast<int>((buffer.size() - src_offset) * sizeof(u16));
+        VAddr dest_ptr = port.dest;
+        // Note: dest_size_left and line_bytes are int to match the type of src_size_left.
+        int dest_size_left = static_cast<int>(port.dest_size);
+        const int line_bytes = static_cast<int>(trim_width * sizeof(u16));
+
+        for (u32 y = 0; y < trim_height; ++y) {
+            int copy_length = std::min({line_bytes, dest_size_left, src_size_left});
+            if (copy_length <= 0) {
+                break;
+            }
+            Memory::WriteBlock(dest_ptr, src_ptr, copy_length);
+            dest_ptr += copy_length;
+            dest_size_left -= copy_length;
+            src_ptr += original_width;
+            src_size_left -= original_width * sizeof(u16);
+        }
+    } else {
+        std::size_t buffer_size = buffer.size() * sizeof(u16);
+        if (port.dest_size != buffer_size) {
+            LOG_ERROR(Service_CAM, "The destination size (%u) doesn't match the source (%zu)!",
+                      port.dest_size, buffer_size);
+        }
+        Memory::WriteBlock(port.dest, buffer.data(), std::min<u32>(port.dest_size, buffer_size));
+    }
+
+    port.is_receiving = false;
+    port.completion_event->Signal();
+}
+
+// Starts a receiving process on the specified port. This can only be called when is_busy = true and
+// is_receiving = false.
+void StartReceiving(int port_id) {
+    PortConfig& port = ports[port_id];
+    port.is_receiving = true;
+
+    // launches a capture task asynchronously
+    const CameraConfig& camera = cameras[port.camera_id];
+    port.capture_result =
+        std::async(std::launch::async, &Camera::CameraInterface::ReceiveFrame, camera.impl.get());
+
+    // schedules a completion event according to the frame rate. The event will block on the
+    // capture task if it is not finished within the expected time
+    CoreTiming::ScheduleEvent(
+        msToCycles(LATENCY_BY_FRAME_RATE[static_cast<int>(camera.frame_rate)]),
+        completion_event_callback, port_id);
+}
+
+// Cancels any ongoing receiving processes at the specified port. This is used by functions that
+// stop capturing.
+// TODO: what is the exact behaviour on real 3DS when stopping capture during an ongoing process?
+//       Will the completion event still be signaled?
+void CancelReceiving(int port_id) {
+    if (!ports[port_id].is_receiving)
+        return;
+    LOG_WARNING(Service_CAM, "tries to cancel an ongoing receiving process.");
+    CoreTiming::UnscheduleEvent(completion_event_callback, port_id);
+    ports[port_id].capture_result.wait();
+    ports[port_id].is_receiving = false;
+}
+
+// Activates the specified port with the specfied camera.
+static void ActivatePort(int port_id, int camera_id) {
+    if (ports[port_id].is_busy && ports[port_id].camera_id != camera_id) {
+        CancelReceiving(port_id);
+        cameras[ports[port_id].camera_id].impl->StopCapture();
+        ports[port_id].is_busy = false;
+    }
+    ports[port_id].is_active = true;
+    ports[port_id].camera_id = camera_id;
+}
+
+template <int max_index>
+class CommandParamBitSet : public BitSet8 {
+public:
+    explicit CommandParamBitSet(u32 command_param)
+        : BitSet8(static_cast<u8>(command_param & 0xFF)) {}
 
-static Kernel::SharedPtr<Kernel::Event> completion_event_cam1;
-static Kernel::SharedPtr<Kernel::Event> completion_event_cam2;
-static Kernel::SharedPtr<Kernel::Event> interrupt_error_event;
-static Kernel::SharedPtr<Kernel::Event> vsync_interrupt_error_event;
+    bool IsValid() const {
+        return m_val < (1 << max_index);
+    }
+
+    bool IsSingle() const {
+        return IsValid() && Count() == 1;
+    }
+};
+
+using PortSet = CommandParamBitSet<2>;
+using ContextSet = CommandParamBitSet<2>;
+using CameraSet = CommandParamBitSet<3>;
+
+} // namespace
 
 void StartCapture(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 port = cmd_buff[1] & 0xFF;
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsValid()) {
+        for (int i : port_select) {
+            if (!ports[i].is_busy) {
+                if (!ports[i].is_active) {
+                    // This doesn't return an error, but seems to put the camera in an undefined
+                    // state
+                    LOG_ERROR(Service_CAM, "port %u hasn't been activated", i);
+                } else {
+                    cameras[ports[i].camera_id].impl->StartCapture();
+                    ports[i].is_busy = true;
+                    if (ports[i].is_pending_receiving) {
+                        ports[i].is_pending_receiving = false;
+                        StartReceiving(i);
+                    }
+                }
+            } else {
+                LOG_WARNING(Service_CAM, "port %u already started", i);
+            }
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x1, 1, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, port=%d", port);
+    LOG_DEBUG(Service_CAM, "called, port_select=%u", port_select.m_val);
 }
 
 void StopCapture(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 port = cmd_buff[1] & 0xFF;
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsValid()) {
+        for (int i : port_select) {
+            if (ports[i].is_busy) {
+                CancelReceiving(i);
+                cameras[ports[i].camera_id].impl->StopCapture();
+                ports[i].is_busy = false;
+            } else {
+                LOG_WARNING(Service_CAM, "port %u already stopped", i);
+            }
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x2, 1, 0);
+
+    LOG_DEBUG(Service_CAM, "called, port_select=%u", port_select.m_val);
+}
+
+void IsBusy(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsValid()) {
+        bool is_busy = true;
+        // Note: the behaviour on no or both ports selected are verified against real 3DS.
+        for (int i : port_select) {
+            is_busy &= ports[i].is_busy;
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = is_busy ? 1 : 0;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0x3, 2, 0);
+
+    LOG_DEBUG(Service_CAM, "called, port_select=%u", port_select.m_val);
+}
+
+void ClearBuffer(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const PortSet port_select(cmd_buff[1]);
+
+    cmd_buff[0] = IPC::MakeHeader(0x4, 1, 0);
     cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, port=%d", port);
+    LOG_WARNING(Service_CAM, "(STUBBED) called, port_select=%u", port_select.m_val);
 }
 
 void GetVsyncInterruptEvent(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 port = cmd_buff[1] & 0xFF;
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsSingle()) {
+        int port = *port_select.begin();
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = IPC::CopyHandleDesc();
+        cmd_buff[3] = Kernel::g_handle_table.Create(ports[port].vsync_interrupt_event).MoveFrom();
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+        cmd_buff[2] = IPC::CopyHandleDesc();
+        cmd_buff[2] = 0;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x5, 1, 2);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
-    cmd_buff[2] = IPC::CopyHandleDesc();
-    cmd_buff[3] = Kernel::g_handle_table.Create(vsync_interrupt_error_event).MoveFrom();
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, port=%d", port);
+    LOG_WARNING(Service_CAM, "(STUBBED) called, port_select=%u", port_select.m_val);
 }
 
 void GetBufferErrorInterruptEvent(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 port = cmd_buff[1] & 0xFF;
-
-    cmd_buff[0] = IPC::MakeHeader(0x6, 1, 2);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
-    cmd_buff[2] = IPC::CopyHandleDesc();
-    cmd_buff[3] = Kernel::g_handle_table.Create(interrupt_error_event).MoveFrom();
-
-    LOG_WARNING(Service_CAM, "(STUBBED) called, port=%d", port);
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsSingle()) {
+        int port = *port_select.begin();
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = IPC::CopyHandleDesc();
+        cmd_buff[3] =
+            Kernel::g_handle_table.Create(ports[port].buffer_error_interrupt_event).MoveFrom();
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+        cmd_buff[2] = IPC::CopyHandleDesc();
+        cmd_buff[2] = 0;
+    }
+
+    LOG_WARNING(Service_CAM, "(STUBBED) called, port_select=%u", port_select.m_val);
 }
 
 void SetReceiving(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    VAddr dest = cmd_buff[1];
-    u8 port = cmd_buff[2] & 0xFF;
-    u32 image_size = cmd_buff[3];
-    u16 trans_unit = cmd_buff[4] & 0xFFFF;
+    const VAddr dest = cmd_buff[1];
+    const PortSet port_select(cmd_buff[2]);
+    const u32 image_size = cmd_buff[3];
+    const u32 trans_unit = cmd_buff[4] & 0xFFFF;
+
+    if (port_select.IsSingle()) {
+        int port_id = *port_select.begin();
+        PortConfig& port = ports[port_id];
+        CancelReceiving(port_id);
+        port.completion_event->Clear();
+        port.dest = dest;
+        port.dest_size = image_size;
+
+        if (port.is_busy) {
+            StartReceiving(port_id);
+        } else {
+            port.is_pending_receiving = true;
+        }
+
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = IPC::CopyHandleDesc();
+        cmd_buff[3] = Kernel::g_handle_table.Create(port.completion_event).MoveFrom();
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0x7, 1, 2);
 
-    Kernel::Event* completion_event =
-        (Port)port == Port::Cam2 ? completion_event_cam2.get() : completion_event_cam1.get();
+    LOG_DEBUG(Service_CAM, "called, addr=0x%X, port_select=%u, image_size=%u, trans_unit=%u", dest,
+              port_select.m_val, image_size, trans_unit);
+}
 
-    completion_event->Signal();
+void IsFinishedReceiving(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    cmd_buff[0] = IPC::MakeHeader(0x7, 1, 2);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
-    cmd_buff[2] = IPC::CopyHandleDesc();
-    cmd_buff[3] = Kernel::g_handle_table.Create(completion_event).MoveFrom();
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsSingle()) {
+        int port = *port_select.begin();
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = (ports[port].is_receiving || ports[port].is_pending_receiving) ? 0 : 1;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, addr=0x%X, port=%d, image_size=%d, trans_unit=%d",
-                dest, port, image_size, trans_unit);
+    cmd_buff[0] = IPC::MakeHeader(0x8, 2, 0);
+
+    LOG_DEBUG(Service_CAM, "called, port_select=%u", port_select.m_val);
 }
 
 void SetTransferLines(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 port = cmd_buff[1] & 0xFF;
-    u16 transfer_lines = cmd_buff[2] & 0xFFFF;
-    u16 width = cmd_buff[3] & 0xFFFF;
-    u16 height = cmd_buff[4] & 0xFFFF;
+    const PortSet port_select(cmd_buff[1]);
+    const u32 transfer_lines = cmd_buff[2] & 0xFFFF;
+    const u32 width = cmd_buff[3] & 0xFFFF;
+    const u32 height = cmd_buff[4] & 0xFFFF;
+
+    if (port_select.IsValid()) {
+        for (int i : port_select) {
+            ports[i].transfer_bytes = transfer_lines * width * 2;
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x9, 1, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, port=%d, lines=%d, width=%d, height=%d", port,
-                transfer_lines, width, height);
+    LOG_WARNING(Service_CAM, "(STUBBED) called, port_select=%u, lines=%u, width=%u, height=%u",
+                port_select.m_val, transfer_lines, width, height);
 }
 
 void GetMaxLines(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u16 width = cmd_buff[1] & 0xFFFF;
-    u16 height = cmd_buff[2] & 0xFFFF;
+    const u32 width = cmd_buff[1] & 0xFFFF;
+    const u32 height = cmd_buff[2] & 0xFFFF;
+
+    // Note: the result of the algorithm below are hwtested with width < 640 and with height < 480
+    constexpr u32 MIN_TRANSFER_UNIT = 256;
+    constexpr u32 MAX_BUFFER_SIZE = 2560;
+    if (width * height * 2 % MIN_TRANSFER_UNIT != 0) {
+        cmd_buff[1] = ERROR_OUT_OF_RANGE.raw;
+    } else {
+        u32 lines = MAX_BUFFER_SIZE / width;
+        if (lines > height) {
+            lines = height;
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        while (height % lines != 0 || (lines * width * 2 % MIN_TRANSFER_UNIT != 0)) {
+            --lines;
+            if (lines == 0) {
+                cmd_buff[1] = ERROR_OUT_OF_RANGE.raw;
+                break;
+            }
+        }
+        cmd_buff[2] = lines;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0xA, 2, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
-    cmd_buff[2] = TRANSFER_BYTES / (2 * width);
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, width=%d, height=%d, lines = %d", width, height,
-                cmd_buff[2]);
+    LOG_DEBUG(Service_CAM, "called, width=%u, height=%u", width, height);
+}
+
+void SetTransferBytes(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const PortSet port_select(cmd_buff[1]);
+    const u32 transfer_bytes = cmd_buff[2] & 0xFFFF;
+    const u32 width = cmd_buff[3] & 0xFFFF;
+    const u32 height = cmd_buff[4] & 0xFFFF;
+
+    if (port_select.IsValid()) {
+        for (int i : port_select) {
+            ports[i].transfer_bytes = transfer_bytes;
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0xB, 1, 0);
+
+    LOG_WARNING(Service_CAM, "(STUBBED)called, port_select=%u, bytes=%u, width=%u, height=%u",
+                port_select.m_val, transfer_bytes, width, height);
 }
 
 void GetTransferBytes(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 port = cmd_buff[1] & 0xFF;
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsSingle()) {
+        int port = *port_select.begin();
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = ports[port].transfer_bytes;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0xC, 2, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
-    cmd_buff[2] = TRANSFER_BYTES;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, port=%d", port);
+    LOG_WARNING(Service_CAM, "(STUBBED)called, port_select=%u", port_select.m_val);
+}
+
+void GetMaxBytes(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const u32 width = cmd_buff[1] & 0xFFFF;
+    const u32 height = cmd_buff[2] & 0xFFFF;
+
+    // Note: the result of the algorithm below are hwtested with width < 640 and with height < 480
+    constexpr u32 MIN_TRANSFER_UNIT = 256;
+    constexpr u32 MAX_BUFFER_SIZE = 2560;
+    if (width * height * 2 % MIN_TRANSFER_UNIT != 0) {
+        cmd_buff[1] = ERROR_OUT_OF_RANGE.raw;
+    } else {
+        u32 bytes = MAX_BUFFER_SIZE;
+
+        while (width * height * 2 % bytes != 0) {
+            bytes -= MIN_TRANSFER_UNIT;
+        }
+
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = bytes;
+    }
+    cmd_buff[0] = IPC::MakeHeader(0xD, 2, 0);
+
+    LOG_DEBUG(Service_CAM, "called, width=%u, height=%u", width, height);
 }
 
 void SetTrimming(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 port = cmd_buff[1] & 0xFF;
-    bool trim = (cmd_buff[2] & 0xFF) != 0;
+    const PortSet port_select(cmd_buff[1]);
+    const bool trim = (cmd_buff[2] & 0xFF) != 0;
+
+    if (port_select.IsValid()) {
+        for (int i : port_select) {
+            ports[i].is_trimming = trim;
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0xE, 1, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, port=%d, trim=%d", port, trim);
+    LOG_DEBUG(Service_CAM, "called, port_select=%u, trim=%d", port_select.m_val, trim);
+}
+
+void IsTrimming(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsSingle()) {
+        int port = *port_select.begin();
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = ports[port].is_trimming;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0xF, 2, 0);
+
+    LOG_DEBUG(Service_CAM, "called, port_select=%u", port_select.m_val);
+}
+
+void SetTrimmingParams(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const PortSet port_select(cmd_buff[1]);
+    const u16 x0 = static_cast<u16>(cmd_buff[2] & 0xFFFF);
+    const u16 y0 = static_cast<u16>(cmd_buff[3] & 0xFFFF);
+    const u16 x1 = static_cast<u16>(cmd_buff[4] & 0xFFFF);
+    const u16 y1 = static_cast<u16>(cmd_buff[5] & 0xFFFF);
+
+    if (port_select.IsValid()) {
+        for (int i : port_select) {
+            ports[i].x0 = x0;
+            ports[i].y0 = y0;
+            ports[i].x1 = x1;
+            ports[i].y1 = y1;
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0x10, 1, 0);
+
+    LOG_DEBUG(Service_CAM, "called, port_select=%u, x0=%u, y0=%u, x1=%u, y1=%u", port_select.m_val,
+              x0, y0, x1, y1);
+}
+
+void GetTrimmingParams(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const PortSet port_select(cmd_buff[1]);
+
+    if (port_select.IsSingle()) {
+        int port = *port_select.begin();
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+        cmd_buff[2] = ports[port].x0;
+        cmd_buff[3] = ports[port].y0;
+        cmd_buff[4] = ports[port].x1;
+        cmd_buff[5] = ports[port].y1;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0x11, 5, 0);
+
+    LOG_DEBUG(Service_CAM, "called, port_select=%u", port_select.m_val);
 }
 
 void SetTrimmingParamsCenter(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 port = cmd_buff[1] & 0xFF;
-    s16 trimW = cmd_buff[2] & 0xFFFF;
-    s16 trimH = cmd_buff[3] & 0xFFFF;
-    s16 camW = cmd_buff[4] & 0xFFFF;
-    s16 camH = cmd_buff[5] & 0xFFFF;
+    const PortSet port_select(cmd_buff[1]);
+    const u16 trim_w = static_cast<u16>(cmd_buff[2] & 0xFFFF);
+    const u16 trim_h = static_cast<u16>(cmd_buff[3] & 0xFFFF);
+    const u16 cam_w = static_cast<u16>(cmd_buff[4] & 0xFFFF);
+    const u16 cam_h = static_cast<u16>(cmd_buff[5] & 0xFFFF);
+
+    if (port_select.IsValid()) {
+        for (int i : port_select) {
+            ports[i].x0 = (cam_w - trim_w) / 2;
+            ports[i].y0 = (cam_h - trim_h) / 2;
+            ports[i].x1 = ports[i].x0 + trim_w;
+            ports[i].y1 = ports[i].y0 + trim_h;
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid port_select=%u", port_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x12, 1, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, port=%d, trimW=%d, trimH=%d, camW=%d, camH=%d",
-                port, trimW, trimH, camW, camH);
+    LOG_DEBUG(Service_CAM, "called, port_select=%u, trim_w=%u, trim_h=%u, cam_w=%u, cam_h=%u",
+              port_select.m_val, trim_w, trim_h, cam_w, cam_h);
 }
 
 void Activate(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 cam_select = cmd_buff[1] & 0xFF;
+    const CameraSet camera_select(cmd_buff[1]);
+
+    if (camera_select.IsValid()) {
+        if (camera_select.m_val == 0) { // deactive all
+            for (int i = 0; i < 2; ++i) {
+                if (ports[i].is_busy) {
+                    CancelReceiving(i);
+                    cameras[ports[i].camera_id].impl->StopCapture();
+                    ports[i].is_busy = false;
+                }
+                ports[i].is_active = false;
+            }
+            cmd_buff[1] = RESULT_SUCCESS.raw;
+        } else if (camera_select[0] && camera_select[1]) {
+            LOG_ERROR(Service_CAM, "camera 0 and 1 can't be both activated");
+            cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+        } else {
+            if (camera_select[0]) {
+                ActivatePort(0, 0);
+            } else if (camera_select[1]) {
+                ActivatePort(0, 1);
+            }
+
+            if (camera_select[2]) {
+                ActivatePort(1, 2);
+            }
+            cmd_buff[1] = RESULT_SUCCESS.raw;
+        }
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u", camera_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x13, 1, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, cam_select=%d", cam_select);
+    LOG_DEBUG(Service_CAM, "called, camera_select=%u", camera_select.m_val);
+}
+
+void SwitchContext(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const CameraSet camera_select(cmd_buff[1]);
+    const ContextSet context_select(cmd_buff[2]);
+
+    if (camera_select.IsValid() && context_select.IsSingle()) {
+        int context = *context_select.begin();
+        for (int camera : camera_select) {
+            cameras[camera].current_context = context;
+            const ContextConfig& context_config = cameras[camera].contexts[context];
+            cameras[camera].impl->SetFlip(context_config.flip);
+            cameras[camera].impl->SetEffect(context_config.effect);
+            cameras[camera].impl->SetFormat(context_config.format);
+            cameras[camera].impl->SetResolution(context_config.resolution);
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u, context_select=%u", camera_select.m_val,
+                  context_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0x14, 1, 0);
+
+    LOG_DEBUG(Service_CAM, "called, camera_select=%u, context_select=%u", camera_select.m_val,
+              context_select.m_val);
 }
 
 void FlipImage(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 cam_select = cmd_buff[1] & 0xFF;
-    u8 flip = cmd_buff[2] & 0xFF;
-    u8 context = cmd_buff[3] & 0xFF;
+    const CameraSet camera_select(cmd_buff[1]);
+    const Flip flip = static_cast<Flip>(cmd_buff[2] & 0xFF);
+    const ContextSet context_select(cmd_buff[3]);
+
+    if (camera_select.IsValid() && context_select.IsValid()) {
+        for (int camera : camera_select) {
+            for (int context : context_select) {
+                cameras[camera].contexts[context].flip = flip;
+                if (cameras[camera].current_context == context) {
+                    cameras[camera].impl->SetFlip(flip);
+                }
+            }
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u, context_select=%u", camera_select.m_val,
+                  context_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x1D, 1, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, cam_select=%d, flip=%d, context=%d", cam_select,
-                flip, context);
+    LOG_DEBUG(Service_CAM, "called, camera_select=%u, flip=%d, context_select=%u",
+              camera_select.m_val, static_cast<int>(flip), context_select.m_val);
+}
+
+void SetDetailSize(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const CameraSet camera_select(cmd_buff[1]);
+    Resolution resolution;
+    resolution.width = static_cast<u16>(cmd_buff[2] & 0xFFFF);
+    resolution.height = static_cast<u16>(cmd_buff[3] & 0xFFFF);
+    resolution.crop_x0 = static_cast<u16>(cmd_buff[4] & 0xFFFF);
+    resolution.crop_y0 = static_cast<u16>(cmd_buff[5] & 0xFFFF);
+    resolution.crop_x1 = static_cast<u16>(cmd_buff[6] & 0xFFFF);
+    resolution.crop_y1 = static_cast<u16>(cmd_buff[7] & 0xFFFF);
+    const ContextSet context_select(cmd_buff[8]);
+
+    if (camera_select.IsValid() && context_select.IsValid()) {
+        for (int camera : camera_select) {
+            for (int context : context_select) {
+                cameras[camera].contexts[context].resolution = resolution;
+                if (cameras[camera].current_context == context) {
+                    cameras[camera].impl->SetResolution(resolution);
+                }
+            }
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u, context_select=%u", camera_select.m_val,
+                  context_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0x1E, 1, 0);
+
+    LOG_DEBUG(Service_CAM, "called, camera_select=%u, width=%u, height=%u, crop_x0=%u, crop_y0=%u, "
+                           "crop_x1=%u, crop_y1=%u, context_select=%u",
+              camera_select.m_val, resolution.width, resolution.height, resolution.crop_x0,
+              resolution.crop_y0, resolution.crop_x1, resolution.crop_y1, context_select.m_val);
 }
 
 void SetSize(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 cam_select = cmd_buff[1] & 0xFF;
-    u8 size = cmd_buff[2] & 0xFF;
-    u8 context = cmd_buff[3] & 0xFF;
+    const CameraSet camera_select(cmd_buff[1]);
+    const u32 size = cmd_buff[2] & 0xFF;
+    const ContextSet context_select(cmd_buff[3]);
+
+    if (camera_select.IsValid() && context_select.IsValid()) {
+        for (int camera : camera_select) {
+            for (int context : context_select) {
+                cameras[camera].contexts[context].resolution = PRESET_RESOLUTION[size];
+                if (cameras[camera].current_context == context) {
+                    cameras[camera].impl->SetResolution(PRESET_RESOLUTION[size]);
+                }
+            }
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u, context_select=%u", camera_select.m_val,
+                  context_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x1F, 1, 0);
-    cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, cam_select=%d, size=%d, context=%d", cam_select,
-                size, context);
+    LOG_DEBUG(Service_CAM, "called, camera_select=%u, size=%u, context_select=%u",
+              camera_select.m_val, size, context_select.m_val);
 }
 
 void SetFrameRate(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    u8 cam_select = cmd_buff[1] & 0xFF;
-    u8 frame_rate = cmd_buff[2] & 0xFF;
+    const CameraSet camera_select(cmd_buff[1]);
+    const FrameRate frame_rate = static_cast<FrameRate>(cmd_buff[2] & 0xFF);
+
+    if (camera_select.IsValid()) {
+        for (int camera : camera_select) {
+            cameras[camera].frame_rate = frame_rate;
+            // TODO(wwylele): consider hinting the actual camera with the expected frame rate
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u", camera_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x20, 1, 0);
+
+    LOG_WARNING(Service_CAM, "(STUBBED) called, camera_select=%u, frame_rate=%d",
+                camera_select.m_val, static_cast<int>(frame_rate));
+}
+
+void SetEffect(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const CameraSet camera_select(cmd_buff[1]);
+    const Effect effect = static_cast<Effect>(cmd_buff[2] & 0xFF);
+    const ContextSet context_select(cmd_buff[3]);
+
+    if (camera_select.IsValid() && context_select.IsValid()) {
+        for (int camera : camera_select) {
+            for (int context : context_select) {
+                cameras[camera].contexts[context].effect = effect;
+                if (cameras[camera].current_context == context) {
+                    cameras[camera].impl->SetEffect(effect);
+                }
+            }
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u, context_select=%u", camera_select.m_val,
+                  context_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0x22, 1, 0);
+
+    LOG_DEBUG(Service_CAM, "called, camera_select=%u, effect=%d, context_select=%u",
+              camera_select.m_val, static_cast<int>(effect), context_select.m_val);
+}
+
+void SetOutputFormat(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const CameraSet camera_select(cmd_buff[1]);
+    const OutputFormat format = static_cast<OutputFormat>(cmd_buff[2] & 0xFF);
+    const ContextSet context_select(cmd_buff[3]);
+
+    if (camera_select.IsValid() && context_select.IsValid()) {
+        for (int camera : camera_select) {
+            for (int context : context_select) {
+                cameras[camera].contexts[context].format = format;
+                if (cameras[camera].current_context == context) {
+                    cameras[camera].impl->SetFormat(format);
+                }
+            }
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u, context_select=%u", camera_select.m_val,
+                  context_select.m_val);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(0x25, 1, 0);
+
+    LOG_DEBUG(Service_CAM, "called, camera_select=%u, format=%d, context_select=%u",
+              camera_select.m_val, static_cast<int>(format), context_select.m_val);
+}
+
+void SynchronizeVsyncTiming(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    const u32 camera_select1 = cmd_buff[1] & 0xFF;
+    const u32 camera_select2 = cmd_buff[2] & 0xFF;
+
+    cmd_buff[0] = IPC::MakeHeader(0x29, 1, 0);
     cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called, cam_select=%d, frame_rate=%d", cam_select,
-                frame_rate);
+    LOG_WARNING(Service_CAM, "(STUBBED) called, camera_select1=%u, camera_select2=%u",
+                camera_select1, camera_select2);
 }
 
 void GetStereoCameraCalibrationData(Service::Interface* self) {
@@ -239,6 +965,67 @@ void GetStereoCameraCalibrationData(Service::Interface* self) {
     LOG_TRACE(Service_CAM, "called");
 }
 
+void SetPackageParameterWithoutContext(Service::Interface* self) {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    PackageParameterWithoutContext package;
+    std::memcpy(&package, cmd_buff + 1, sizeof(package));
+
+    cmd_buff[0] = IPC::MakeHeader(0x33, 1, 0);
+    cmd_buff[1] = RESULT_SUCCESS.raw;
+
+    LOG_WARNING(Service_CAM, "(STUBBED) called");
+}
+
+template <typename PackageParameterType, int command_id>
+static void SetPackageParameter() {
+    u32* cmd_buff = Kernel::GetCommandBuffer();
+
+    PackageParameterType package;
+    std::memcpy(&package, cmd_buff + 1, sizeof(package));
+
+    const CameraSet camera_select(static_cast<u32>(package.camera_select));
+    const ContextSet context_select(static_cast<u32>(package.context_select));
+
+    if (camera_select.IsValid() && context_select.IsValid()) {
+        for (int camera_id : camera_select) {
+            CameraConfig& camera = cameras[camera_id];
+            for (int context_id : context_select) {
+                ContextConfig& context = camera.contexts[context_id];
+                context.effect = package.effect;
+                context.flip = package.flip;
+                context.resolution = package.GetResolution();
+                if (context_id == camera.current_context) {
+                    camera.impl->SetEffect(context.effect);
+                    camera.impl->SetFlip(context.flip);
+                    camera.impl->SetResolution(context.resolution);
+                }
+            }
+        }
+        cmd_buff[1] = RESULT_SUCCESS.raw;
+    } else {
+        LOG_ERROR(Service_CAM, "invalid camera_select=%u, context_select=%u", package.camera_select,
+                  package.context_select);
+        cmd_buff[1] = ERROR_INVALID_ENUM_VALUE.raw;
+    }
+
+    cmd_buff[0] = IPC::MakeHeader(command_id, 1, 0);
+
+    LOG_DEBUG(Service_CAM, "called");
+}
+
+Resolution PackageParameterWithContext::GetResolution() {
+    return PRESET_RESOLUTION[static_cast<int>(size)];
+}
+
+void SetPackageParameterWithContext(Service::Interface* self) {
+    SetPackageParameter<PackageParameterWithContext, 0x34>();
+}
+
+void SetPackageParameterWithContextDetail(Service::Interface* self) {
+    SetPackageParameter<PackageParameterWithContextDetail, 0x35>();
+}
+
 void GetSuitableY2rStandardCoefficient(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
@@ -263,24 +1050,50 @@ void PlayShutterSound(Service::Interface* self) {
 void DriverInitialize(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
-    completion_event_cam1->Clear();
-    completion_event_cam2->Clear();
-    interrupt_error_event->Clear();
-    vsync_interrupt_error_event->Clear();
+    for (int camera_id = 0; camera_id < NumCameras; ++camera_id) {
+        CameraConfig& camera = cameras[camera_id];
+        camera.current_context = 0;
+        for (int context_id = 0; context_id < 2; ++context_id) {
+            // Note: the following default values are verified against real 3DS
+            ContextConfig& context = camera.contexts[context_id];
+            context.flip = camera_id == 1 ? Flip::Horizontal : Flip::None;
+            context.effect = Effect::None;
+            context.format = OutputFormat::YUV422;
+            context.resolution =
+                context_id == 0 ? PRESET_RESOLUTION[5 /*DS_LCD*/] : PRESET_RESOLUTION[0 /*VGA*/];
+        }
+        camera.impl = Camera::CreateCamera(Settings::values.camera_name[camera_id],
+                                           Settings::values.camera_config[camera_id]);
+        camera.impl->SetFlip(camera.contexts[0].flip);
+        camera.impl->SetEffect(camera.contexts[0].effect);
+        camera.impl->SetFormat(camera.contexts[0].format);
+        camera.impl->SetResolution(camera.contexts[0].resolution);
+    }
+
+    for (PortConfig& port : ports) {
+        port.Clear();
+    }
 
     cmd_buff[0] = IPC::MakeHeader(0x39, 1, 0);
     cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called");
+    LOG_DEBUG(Service_CAM, "called");
 }
 
 void DriverFinalize(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
+    CancelReceiving(0);
+    CancelReceiving(1);
+
+    for (CameraConfig& camera : cameras) {
+        camera.impl = nullptr;
+    }
+
     cmd_buff[0] = IPC::MakeHeader(0x3A, 1, 0);
     cmd_buff[1] = RESULT_SUCCESS.raw;
 
-    LOG_WARNING(Service_CAM, "(STUBBED) called");
+    LOG_DEBUG(Service_CAM, "called");
 }
 
 void Init() {
@@ -291,21 +1104,28 @@ void Init() {
     AddService(new CAM_S_Interface);
     AddService(new CAM_U_Interface);
 
-    completion_event_cam1 =
-        Kernel::Event::Create(ResetType::OneShot, "CAM_U::completion_event_cam1");
-    completion_event_cam2 =
-        Kernel::Event::Create(ResetType::OneShot, "CAM_U::completion_event_cam2");
-    interrupt_error_event =
-        Kernel::Event::Create(ResetType::OneShot, "CAM_U::interrupt_error_event");
-    vsync_interrupt_error_event =
-        Kernel::Event::Create(ResetType::OneShot, "CAM_U::vsync_interrupt_error_event");
+    for (PortConfig& port : ports) {
+        port.completion_event = Event::Create(ResetType::Sticky, "CAM_U::completion_event");
+        port.buffer_error_interrupt_event =
+            Event::Create(ResetType::OneShot, "CAM_U::buffer_error_interrupt_event");
+        port.vsync_interrupt_event =
+            Event::Create(ResetType::OneShot, "CAM_U::vsync_interrupt_event");
+    }
+    completion_event_callback =
+        CoreTiming::RegisterEvent("CAM_U::CompletionEventCallBack", CompletionEventCallBack);
 }
 
 void Shutdown() {
-    completion_event_cam1 = nullptr;
-    completion_event_cam2 = nullptr;
-    interrupt_error_event = nullptr;
-    vsync_interrupt_error_event = nullptr;
+    CancelReceiving(0);
+    CancelReceiving(1);
+    for (PortConfig& port : ports) {
+        port.completion_event = nullptr;
+        port.buffer_error_interrupt_event = nullptr;
+        port.vsync_interrupt_event = nullptr;
+    }
+    for (CameraConfig& camera : cameras) {
+        camera.impl = nullptr;
+    }
 }
 
 } // namespace CAM
diff --git a/src/core/hle/service/cam/cam.h b/src/core/hle/service/cam/cam.h
index c9b6f8acf..f6bff8bc6 100644
--- a/src/core/hle/service/cam/cam.h
+++ b/src/core/hle/service/cam/cam.h
@@ -13,17 +13,12 @@
 namespace Service {
 namespace CAM {
 
-enum class Port : u8 { None = 0, Cam1 = 1, Cam2 = 2, Both = Cam1 | Cam2 };
+enum CameraIndex {
+    OuterRightCamera = 0,
+    InnerCamera = 1,
+    OuterLeftCamera = 2,
 
-enum class CameraSelect : u8 {
-    None = 0,
-    Out1 = 1,
-    In1 = 2,
-    Out2 = 4,
-    In1Out1 = Out1 | In1,
-    Out1Out2 = Out1 | Out2,
-    In1Out2 = In1 | Out2,
-    All = Out1 | In1 | Out2,
+    NumCameras = 3,
 };
 
 enum class Effect : u8 {
@@ -35,13 +30,6 @@ enum class Effect : u8 {
     Sepia01 = 5,
 };
 
-enum class Context : u8 {
-    None = 0,
-    A = 1,
-    B = 2,
-    Both = A | B,
-};
-
 enum class Flip : u8 {
     None = 0,
     Horizontal = 1,
@@ -160,8 +148,23 @@ struct StereoCameraCalibrationData {
 static_assert(sizeof(StereoCameraCalibrationData) == 64,
               "StereoCameraCalibrationData structure size is wrong");
 
-struct PackageParameterCameraSelect {
-    CameraSelect camera;
+/**
+ * Resolution parameters for the camera.
+ * The native resolution of 3DS camera is 640 * 480. The captured image will be cropped in the
+ * region [crop_x0, crop_x1] * [crop_y0, crop_y1], and then scaled to size width * height as the
+ * output image. Note that all cropping coordinates are inclusive.
+ */
+struct Resolution {
+    u16 width;
+    u16 height;
+    u16 crop_x0;
+    u16 crop_y0;
+    u16 crop_x1;
+    u16 crop_y1;
+};
+
+struct PackageParameterWithoutContext {
+    u8 camera_select;
     s8 exposure;
     WhiteBalance white_balance;
     s8 sharpness;
@@ -183,14 +186,43 @@ struct PackageParameterCameraSelect {
     s16 auto_white_balance_window_height;
 };
 
-static_assert(sizeof(PackageParameterCameraSelect) == 28,
-              "PackageParameterCameraSelect structure size is wrong");
+static_assert(sizeof(PackageParameterWithoutContext) == 28,
+              "PackageParameterCameraWithoutContext structure size is wrong");
+
+struct PackageParameterWithContext {
+    u8 camera_select;
+    u8 context_select;
+    Flip flip;
+    Effect effect;
+    Size size;
+    INSERT_PADDING_BYTES(3);
+
+    Resolution GetResolution();
+};
+
+static_assert(sizeof(PackageParameterWithContext) == 8,
+              "PackageParameterWithContext structure size is wrong");
+
+struct PackageParameterWithContextDetail {
+    u8 camera_select;
+    u8 context_select;
+    Flip flip;
+    Effect effect;
+    Resolution resolution;
+
+    Resolution GetResolution() {
+        return resolution;
+    }
+};
+
+static_assert(sizeof(PackageParameterWithContextDetail) == 16,
+              "PackageParameterWithContextDetail structure size is wrong");
 
 /**
- * Unknown
+ * Starts capturing at the selected port.
  *  Inputs:
  *      0: 0x00010040
- *      1: u8 Camera port (`Port` enum)
+ *      1: u8 selected port
  *  Outputs:
  *      0: 0x00010040
  *      1: ResultCode
@@ -198,10 +230,10 @@ static_assert(sizeof(PackageParameterCameraSelect) == 28,
 void StartCapture(Service::Interface* self);
 
 /**
- * Unknown
+ * Stops capturing from the selected port.
  *  Inputs:
  *      0: 0x00020040
- *      1: u8 Camera port (`Port` enum)
+ *      1: u8 selected port
  *  Outputs:
  *      0: 0x00020040
  *      1: ResultCode
@@ -209,10 +241,33 @@ void StartCapture(Service::Interface* self);
 void StopCapture(Service::Interface* self);
 
 /**
+ * Gets whether the selected port is currently capturing.
+ *  Inputs:
+ *      0: 0x00030040
+ *      1: u8 selected port
+ *  Outputs:
+ *      0: 0x00030080
+ *      1: ResultCode
+ *      2: 0 if not capturing, 1 if capturing
+ */
+void IsBusy(Service::Interface* self);
+
+/**
+ * Clears the buffer of selected ports.
+ *  Inputs:
+ *      0: 0x00040040
+ *      1: u8 selected port
+ *  Outputs:
+ *      0: 0x00040040
+ *      2: ResultCode
+ */
+void ClearBuffer(Service::Interface* self);
+
+/**
  * Unknown
  *  Inputs:
  *      0: 0x00050040
- *      1: u8 Camera port (`Port` enum)
+ *      1: u8 selected port
  *  Outputs:
  *      0: 0x00050042
  *      1: ResultCode
@@ -225,7 +280,7 @@ void GetVsyncInterruptEvent(Service::Interface* self);
  * Unknown
  *  Inputs:
  *      0: 0x00060040
- *      1: u8 Camera port (`Port` enum)
+ *      1: u8 selected port
  *  Outputs:
  *      0: 0x00060042
  *      1: ResultCode
@@ -241,9 +296,9 @@ void GetBufferErrorInterruptEvent(Service::Interface* self);
  *  Inputs:
  *      0: 0x00070102
  *      1: Destination address in calling process
- *      2: u8 Camera port (`Port` enum)
- *      3: Image size (in bytes?)
- *      4: u16 Transfer unit size (in bytes?)
+ *      2: u8 selected port
+ *      3: Image size (in bytes)
+ *      4: u16 Transfer unit size (in bytes)
  *      5: Descriptor: Handle
  *      6: Handle to destination process
  *  Outputs:
@@ -255,21 +310,34 @@ void GetBufferErrorInterruptEvent(Service::Interface* self);
 void SetReceiving(Service::Interface* self);
 
 /**
- * Unknown
+ * Gets whether the selected port finished receiving a frame.
+ *  Inputs:
+ *      0: 0x00080040
+ *      1: u8 selected port
+ *  Outputs:
+ *      0: 0x00080080
+ *      1: ResultCode
+ *      2: 0 if not finished, 1 if finished
+ */
+void IsFinishedReceiving(Service::Interface* self);
+
+/**
+ * Sets the number of lines the buffer contains.
  *  Inputs:
  *      0: 0x00090100
- *      1: u8 Camera port (`Port` enum)
+ *      1: u8 selected port
  *      2: u16 Number of lines to transfer
  *      3: u16 Width
  *      4: u16 Height
  *  Outputs:
  *      0: 0x00090040
  *      1: ResultCode
+ * @todo figure out how the "buffer" actually works.
  */
 void SetTransferLines(Service::Interface* self);
 
 /**
- * Unknown
+ * Gets the maximum number of lines that fit in the buffer
  *  Inputs:
  *      0: 0x000A0080
  *      1: u16 Width
@@ -277,27 +345,58 @@ void SetTransferLines(Service::Interface* self);
  *  Outputs:
  *      0: 0x000A0080
  *      1: ResultCode
- *      2: Maximum number of lines that fit in the buffer(?)
+ *      2: Maximum number of lines that fit in the buffer
+ * @todo figure out how the "buffer" actually works.
  */
 void GetMaxLines(Service::Interface* self);
 
 /**
- * Unknown
+ * Sets the number of bytes the buffer contains.
+ *  Inputs:
+ *      0: 0x000B0100
+ *      1: u8 selected port
+ *      2: u16 Number of bytes to transfer
+ *      3: u16 Width
+ *      4: u16 Height
+ *  Outputs:
+ *      0: 0x000B0040
+ *      1: ResultCode
+ * @todo figure out how the "buffer" actually works.
+ */
+void SetTransferBytes(Service::Interface* self);
+
+/**
+ * Gets the number of bytes to the buffer contains.
  *  Inputs:
  *      0: 0x000C0040
- *      1: u8 Camera port (`Port` enum)
+ *      1: u8 selected port
  *  Outputs:
  *      0: 0x000C0080
  *      1: ResultCode
- *      2: Total number of bytes for each frame with current settings(?)
+ *      2: The number of bytes the buffer contains
+ * @todo figure out how the "buffer" actually works.
  */
 void GetTransferBytes(Service::Interface* self);
 
 /**
- * Unknown
+ * Gets the maximum number of bytes that fit in the buffer.
+ *  Inputs:
+ *      0: 0x000D0080
+ *      1: u16 Width
+ *      2: u16 Height
+ *  Outputs:
+ *      0: 0x000D0080
+ *      1: ResultCode
+ *      2: Maximum number of bytes that fit in the buffer
+ * @todo figure out how the "buffer" actually works.
+ */
+void GetMaxBytes(Service::Interface* self);
+
+/**
+ * Enables or disables trimming.
  *  Inputs:
  *      0: 0x000E0080
- *      1: u8 Camera port (`Port` enum)
+ *      1: u8 selected port
  *      2: u8 bool Enable trimming if true
  *  Outputs:
  *      0: 0x000E0040
@@ -306,14 +405,58 @@ void GetTransferBytes(Service::Interface* self);
 void SetTrimming(Service::Interface* self);
 
 /**
- * Unknown
+ * Gets whether trimming is enabled.
+ *  Inputs:
+ *      0: 0x000F0040
+ *      1: u8 selected port
+ *  Outputs:
+ *      0: 0x000F0080
+ *      1: ResultCode
+ *      2: u8 bool Enable trimming if true
+ */
+void IsTrimming(Service::Interface* self);
+
+/**
+ * Sets the position to trim.
+ *  Inputs:
+ *      0: 0x00100140
+ *      1: u8 selected port
+ *      2: x start
+ *      3: y start
+ *      4: x end (exclusive)
+ *      5: y end (exclusive)
+ *  Outputs:
+ *      0: 0x00100040
+ *      1: ResultCode
+ */
+void SetTrimmingParams(Service::Interface* self);
+
+/**
+ * Gets the position to trim.
+ *  Inputs:
+ *      0: 0x00110040
+ *      1: u8 selected port
+ *
+ *  Outputs:
+ *      0: 0x00110140
+ *      1: ResultCode
+ *      2: x start
+ *      3: y start
+ *      4: x end (exclusive)
+ *      5: y end (exclusive)
+ */
+void GetTrimmingParams(Service::Interface* self);
+
+/**
+ * Sets the position to trim by giving the width and height. The trimming window is always at the
+ * center.
  *  Inputs:
  *      0: 0x00120140
- *      1: u8 Camera port (`Port` enum)
- *      2: s16 Trim width(?)
- *      3: s16 Trim height(?)
- *      4: s16 Camera width(?)
- *      5: s16 Camera height(?)
+ *      1: u8 selected port
+ *      2: s16 Trim width
+ *      3: s16 Trim height
+ *      4: s16 Camera width
+ *      5: s16 Camera height
  *  Outputs:
  *      0: 0x00120040
  *      1: ResultCode
@@ -324,7 +467,7 @@ void SetTrimmingParamsCenter(Service::Interface* self);
  * Selects up to two physical cameras to enable.
  *  Inputs:
  *      0: 0x00130040
- *      1: u8 Cameras to activate (`CameraSelect` enum)
+ *      1: u8 selected camera
  *  Outputs:
  *      0: 0x00130040
  *      1: ResultCode
@@ -332,12 +475,24 @@ void SetTrimmingParamsCenter(Service::Interface* self);
 void Activate(Service::Interface* self);
 
 /**
- * Unknown
+ * Switches the context of camera settings.
+ *  Inputs:
+ *      0: 0x00140080
+ *      1: u8 selected camera
+ *      2: u8 selected context
+ *  Outputs:
+ *      0: 0x00140040
+ *      1: ResultCode
+ */
+void SwitchContext(Service::Interface* self);
+
+/**
+ * Sets flipping of images
  *  Inputs:
  *      0: 0x001D00C0
- *      1: u8 Camera select (`CameraSelect` enum)
+ *      1: u8 selected camera
  *      2: u8 Type of flipping to perform (`Flip` enum)
- *      3: u8 Context (`Context` enum)
+ *      3: u8 selected context
  *  Outputs:
  *      0: 0x001D0040
  *      1: ResultCode
@@ -345,12 +500,30 @@ void Activate(Service::Interface* self);
 void FlipImage(Service::Interface* self);
 
 /**
- * Unknown
+ * Sets camera resolution from custom parameters. For more details see the Resolution struct.
+ *  Inputs:
+ *      0: 0x001E0200
+ *      1: u8 selected camera
+ *      2: width
+ *      3: height
+ *      4: crop x0
+ *      5: crop y0
+ *      6: crop x1
+ *      7: crop y1
+ *      8: u8 selected context
+ *  Outputs:
+ *      0: 0x001E0040
+ *      1: ResultCode
+ */
+void SetDetailSize(Service::Interface* self);
+
+/**
+ * Sets camera resolution from preset resolution parameters. .
  *  Inputs:
  *      0: 0x001F00C0
- *      1: u8 Camera select (`CameraSelect` enum)
+ *      1: u8 selected camera
  *      2: u8 Camera frame resolution (`Size` enum)
- *      3: u8 Context id (`Context` enum)
+ *      3: u8 selected context
  *  Outputs:
  *      0: 0x001F0040
  *      1: ResultCode
@@ -358,10 +531,10 @@ void FlipImage(Service::Interface* self);
 void SetSize(Service::Interface* self);
 
 /**
- * Unknown
+ * Sets camera framerate.
  *  Inputs:
  *      0: 0x00200080
- *      1: u8 Camera select (`CameraSelect` enum)
+ *      1: u8 selected camera
  *      2: u8 Camera framerate (`FrameRate` enum)
  *  Outputs:
  *      0: 0x00200040
@@ -370,6 +543,44 @@ void SetSize(Service::Interface* self);
 void SetFrameRate(Service::Interface* self);
 
 /**
+ * Sets effect on the output image
+ *  Inputs:
+ *      0: 0x002200C0
+ *      1: u8 selected camera
+ *      2: u8 image effect (`Effect` enum)
+ *      3: u8 selected context
+ *  Outputs:
+ *      0: 0x00220040
+ *      1: ResultCode
+ */
+void SetEffect(Service::Interface* self);
+
+/**
+ * Sets format of the output image
+ *  Inputs:
+ *      0: 0x002500C0
+ *      1: u8 selected camera
+ *      2: u8 image format (`OutputFormat` enum)
+ *      3: u8 selected context
+ *  Outputs:
+ *      0: 0x00250040
+ *      1: ResultCode
+ */
+void SetOutputFormat(Service::Interface* self);
+
+/**
+ * Synchronizes the V-Sync timing of two cameras.
+ *  Inputs:
+ *      0: 0x00290080
+ *      1: u8 selected camera 1
+ *      2: u8 selected camera 2
+ *  Outputs:
+ *      0: 0x00280040
+ *      1: ResultCode
+ */
+void SynchronizeVsyncTiming(Service::Interface* self);
+
+/**
  * Returns calibration data relating the outside cameras to eachother, for use in AR applications.
  *
  *  Inputs:
@@ -382,6 +593,45 @@ void SetFrameRate(Service::Interface* self);
 void GetStereoCameraCalibrationData(Service::Interface* self);
 
 /**
+ * Batch-configures context-free settings.
+ *
+ *  Inputs:
+ *      0: 0x003302C0
+ *      1-7: struct PachageParameterWithoutContext
+ *      8-11: unused
+ *  Outputs:
+ *      0: 0x00330040
+ *      1: ResultCode
+ */
+void SetPackageParameterWithoutContext(Service::Interface* self);
+
+/**
+ * Batch-configures context-related settings with preset resolution parameters.
+ *
+ *  Inputs:
+ *      0: 0x00340140
+ *      1-2: struct PackageParameterWithContext
+ *      3-5: unused
+ *  Outputs:
+ *      0: 0x00340040
+ *      1: ResultCode
+ */
+void SetPackageParameterWithContext(Service::Interface* self);
+
+/**
+ * Batch-configures context-related settings with custom resolution parameters
+ *
+ *  Inputs:
+ *      0: 0x003501C0
+ *      1-4: struct PackageParameterWithContextDetail
+ *      5-7: unused
+ *  Outputs:
+ *      0: 0x00350040
+ *      1: ResultCode
+ */
+void SetPackageParameterWithContextDetail(Service::Interface* self);
+
+/**
  * Unknown
  *  Inputs:
  *      0: 0x00360000
diff --git a/src/core/hle/service/cam/cam_u.cpp b/src/core/hle/service/cam/cam_u.cpp
index af2123e5b..251c1e6d4 100644
--- a/src/core/hle/service/cam/cam_u.cpp
+++ b/src/core/hle/service/cam/cam_u.cpp
@@ -11,24 +11,24 @@ namespace CAM {
 const Interface::FunctionInfo FunctionTable[] = {
     {0x00010040, StartCapture, "StartCapture"},
     {0x00020040, StopCapture, "StopCapture"},
-    {0x00030040, nullptr, "IsBusy"},
-    {0x00040040, nullptr, "ClearBuffer"},
+    {0x00030040, IsBusy, "IsBusy"},
+    {0x00040040, ClearBuffer, "ClearBuffer"},
     {0x00050040, GetVsyncInterruptEvent, "GetVsyncInterruptEvent"},
     {0x00060040, GetBufferErrorInterruptEvent, "GetBufferErrorInterruptEvent"},
     {0x00070102, SetReceiving, "SetReceiving"},
-    {0x00080040, nullptr, "IsFinishedReceiving"},
+    {0x00080040, IsFinishedReceiving, "IsFinishedReceiving"},
     {0x00090100, SetTransferLines, "SetTransferLines"},
     {0x000A0080, GetMaxLines, "GetMaxLines"},
-    {0x000B0100, nullptr, "SetTransferBytes"},
+    {0x000B0100, SetTransferBytes, "SetTransferBytes"},
     {0x000C0040, GetTransferBytes, "GetTransferBytes"},
-    {0x000D0080, nullptr, "GetMaxBytes"},
+    {0x000D0080, GetMaxBytes, "GetMaxBytes"},
     {0x000E0080, SetTrimming, "SetTrimming"},
-    {0x000F0040, nullptr, "IsTrimming"},
-    {0x00100140, nullptr, "SetTrimmingParams"},
-    {0x00110040, nullptr, "GetTrimmingParams"},
+    {0x000F0040, IsTrimming, "IsTrimming"},
+    {0x00100140, SetTrimmingParams, "SetTrimmingParams"},
+    {0x00110040, GetTrimmingParams, "GetTrimmingParams"},
     {0x00120140, SetTrimmingParamsCenter, "SetTrimmingParamsCenter"},
     {0x00130040, Activate, "Activate"},
-    {0x00140080, nullptr, "SwitchContext"},
+    {0x00140080, SwitchContext, "SwitchContext"},
     {0x00150080, nullptr, "SetExposure"},
     {0x00160080, nullptr, "SetWhiteBalance"},
     {0x00170080, nullptr, "SetWhiteBalanceWithoutBaseUp"},
@@ -38,18 +38,18 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x001B0080, nullptr, "SetAutoWhiteBalance"},
     {0x001C0040, nullptr, "IsAutoWhiteBalance"},
     {0x001D00C0, FlipImage, "FlipImage"},
-    {0x001E0200, nullptr, "SetDetailSize"},
+    {0x001E0200, SetDetailSize, "SetDetailSize"},
     {0x001F00C0, SetSize, "SetSize"},
     {0x00200080, SetFrameRate, "SetFrameRate"},
     {0x00210080, nullptr, "SetPhotoMode"},
-    {0x002200C0, nullptr, "SetEffect"},
+    {0x002200C0, SetEffect, "SetEffect"},
     {0x00230080, nullptr, "SetContrast"},
     {0x00240080, nullptr, "SetLensCorrection"},
-    {0x002500C0, nullptr, "SetOutputFormat"},
+    {0x002500C0, SetOutputFormat, "SetOutputFormat"},
     {0x00260140, nullptr, "SetAutoExposureWindow"},
     {0x00270140, nullptr, "SetAutoWhiteBalanceWindow"},
     {0x00280080, nullptr, "SetNoiseFilter"},
-    {0x00290080, nullptr, "SynchronizeVsyncTiming"},
+    {0x00290080, SynchronizeVsyncTiming, "SynchronizeVsyncTiming"},
     {0x002A0080, nullptr, "GetLatestVsyncTiming"},
     {0x002B0000, GetStereoCameraCalibrationData, "GetStereoCameraCalibrationData"},
     {0x002C0400, nullptr, "SetStereoCameraCalibrationData"},
@@ -59,9 +59,9 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x00300080, nullptr, "ReadMcuVariableI2cExclusive"},
     {0x00310180, nullptr, "SetImageQualityCalibrationData"},
     {0x00320000, nullptr, "GetImageQualityCalibrationData"},
-    {0x003302C0, nullptr, "SetPackageParameterWithoutContext"},
-    {0x00340140, nullptr, "SetPackageParameterWithContext"},
-    {0x003501C0, nullptr, "SetPackageParameterWithContextDetail"},
+    {0x003302C0, SetPackageParameterWithoutContext, "SetPackageParameterWithoutContext"},
+    {0x00340140, SetPackageParameterWithContext, "SetPackageParameterWithContext"},
+    {0x003501C0, SetPackageParameterWithContextDetail, "SetPackageParameterWithContextDetail"},
     {0x00360000, GetSuitableY2rStandardCoefficient, "GetSuitableY2rStandardCoefficient"},
     {0x00370202, nullptr, "PlayShutterSoundWithWave"},
     {0x00380040, PlayShutterSound, "PlayShutterSound"},
diff --git a/src/core/settings.h b/src/core/settings.h
index e22ce0f16..b6c75531f 100644
--- a/src/core/settings.h
+++ b/src/core/settings.h
@@ -7,6 +7,7 @@
 #include <array>
 #include <string>
 #include "common/common_types.h"
+#include "core/hle/service/cam/cam.h"
 
 namespace Settings {
 
@@ -106,6 +107,10 @@ struct Values {
     bool enable_audio_stretching;
     std::string audio_device_id;
 
+    // Camera
+    std::array<std::string, Service::CAM::NumCameras> camera_name;
+    std::array<std::string, Service::CAM::NumCameras> camera_config;
+
     // Debugging
     bool use_gdbstub;
     u16 gdbstub_port;