├── .clang-format ├── .dockerignore ├── .github └── workflows │ └── build.yaml ├── .gitignore ├── CMakeLists.txt ├── Dockerfile ├── LICENSE ├── README.md ├── cmake └── FindRpiRgbLedMatrix.cmake └── src ├── color_temp.cpp ├── color_temp.hpp ├── consts.hpp ├── control_main.cpp ├── messages.hpp ├── pipe_main.cpp ├── server_main.cpp └── virtual_main.cpp /.clang-format: -------------------------------------------------------------------------------- 1 | UseTab: false 2 | IndentWidth: 2 3 | BreakBeforeBraces: Attach 4 | AllowShortIfStatementsOnASingleLine: false 5 | IndentCaseLabels: false 6 | ColumnLimit: 100 7 | NamespaceIndentation: Inner 8 | -------------------------------------------------------------------------------- /.dockerignore: -------------------------------------------------------------------------------- 1 | ** 2 | 3 | !cmake/ 4 | !src/ 5 | !CMakeLists.txt 6 | -------------------------------------------------------------------------------- /.github/workflows/build.yaml: -------------------------------------------------------------------------------- 1 | name: build 2 | 3 | on: 4 | push: 5 | branches: 6 | - main 7 | tags: 8 | - v* 9 | 10 | concurrency: 11 | group: ${{ github.workflow }}-${{ github.ref }} 12 | cancel-in-progress: true 13 | 14 | jobs: 15 | build: 16 | runs-on: ubuntu-latest 17 | steps: 18 | - name: Checkout 19 | uses: actions/checkout@v4 20 | - name: Get image base name 21 | id: image-base-name 22 | run: | 23 | # REPO_LOWERCASE="${{ github.repository }} | tr '[:upper:]' '[:lower:]')" 24 | echo "value=ghcr.io/${{ github.repository }}" >> $GITHUB_OUTPUT 25 | - name: Set up QEMU 26 | uses: docker/setup-qemu-action@v1 27 | with: 28 | platforms: arm, arm64 29 | - name: Set up Docker Buildx 30 | uses: docker/setup-buildx-action@v3 31 | - name: Login to GitHub Container Registry 32 | uses: docker/login-action@v3 33 | with: 34 | registry: ghcr.io 35 | username: ${{ github.actor }} 36 | password: ${{ secrets.GITHUB_TOKEN }} 37 | - name: Docker Meta 38 | id: meta 39 | uses: docker/metadata-action@v5 40 | with: 41 | images: ${{ steps.image-base-name.outputs.value }} 42 | tags: | 43 | type=edge 44 | type=semver,pattern={{version}} 45 | type=semver,pattern={{major}} 46 | type=semver,pattern={{major}}.{{minor}} 47 | - name: Build and push 48 | uses: docker/build-push-action@v6 49 | with: 50 | labels: ${{ steps.meta.outputs.labels }} 51 | platforms: linux/amd64, linux/arm64 52 | push: true 53 | tags: ${{ steps.meta.outputs.tags }} 54 | target: run 55 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .cache 2 | .vscode 3 | build/ 4 | -------------------------------------------------------------------------------- /CMakeLists.txt: -------------------------------------------------------------------------------- 1 | cmake_minimum_required(VERSION 3.28) 2 | 3 | project(led-matrix-zmq-server 4 | LANGUAGES CXX 5 | ) 6 | 7 | option(BUILD_SERVER "Build the server" ON) 8 | option(BUILD_TOOLS "Build tools" ON) 9 | option(BUILD_VIRTUAL "Build virtual server" OFF) 10 | 11 | list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake) 12 | 13 | set(COMPILE_FEATURES cxx_std_20) 14 | set(COMPILE_OPTIONS -O3 -Wall -Wextra) 15 | 16 | find_package(PkgConfig REQUIRED) 17 | pkg_check_modules(ZMQ REQUIRED libzmq cppzmq) 18 | 19 | include(FetchContent) 20 | FetchContent_Declare( 21 | argparse 22 | GIT_REPOSITORY https://github.com/p-ranav/argparse.git 23 | GIT_TAG v3.1 24 | ) 25 | FetchContent_Declare( 26 | plog 27 | GIT_REPOSITORY https://github.com/SergiusTheBest/plog.git 28 | GIT_TAG 1.1.10 29 | ) 30 | FetchContent_MakeAvailable(argparse plog) 31 | 32 | if( 33 | BUILD_SERVER 34 | AND ( 35 | CMAKE_SYSTEM_PROCESSOR MATCHES "arm" 36 | OR CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64" 37 | ) 38 | ) 39 | find_package(RpiRgbLedMatrix REQUIRED) 40 | 41 | add_executable(led-matrix-zmq-server 42 | src/server_main.cpp 43 | src/color_temp.cpp 44 | ) 45 | target_link_libraries(led-matrix-zmq-server PRIVATE 46 | argparse 47 | plog 48 | pthread 49 | RpiRgbLedMatrix::RpiRgbLedMatrix 50 | zmq 51 | ) 52 | target_compile_features(led-matrix-zmq-server PRIVATE ${COMPILE_FEATURES}) 53 | target_compile_options(led-matrix-zmq-server PRIVATE ${COMPILE_OPTIONS}) 54 | endif() 55 | 56 | if (BUILD_TOOLS) 57 | add_executable(led-matrix-zmq-control src/control_main.cpp) 58 | target_link_libraries(led-matrix-zmq-control PRIVATE argparse plog zmq) 59 | target_compile_features(led-matrix-zmq-control PRIVATE ${COMPILE_FEATURES}) 60 | 61 | add_executable(led-matrix-zmq-pipe src/pipe_main.cpp) 62 | target_link_libraries(led-matrix-zmq-pipe PRIVATE argparse plog zmq) 63 | target_compile_features(led-matrix-zmq-pipe PRIVATE ${COMPILE_FEATURES}) 64 | endif() 65 | 66 | if (BUILD_VIRTUAL) 67 | find_package(SDL2 REQUIRED) 68 | 69 | add_executable(led-matrix-zmq-virtual src/virtual_main.cpp) 70 | target_link_libraries(led-matrix-zmq-virtual PRIVATE 71 | argparse 72 | plog 73 | SDL2::SDL2 74 | zmq 75 | ) 76 | target_compile_features(led-matrix-zmq-virtual PRIVATE ${COMPILE_FEATURES}) 77 | endif() 78 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM alpine:latest AS build 2 | 3 | RUN apk add --no-cache \ 4 | clang \ 5 | cmake \ 6 | cppzmq \ 7 | git \ 8 | make \ 9 | pkgconf 10 | 11 | ENV CC="clang" 12 | ENV CXX="clang++" 13 | ENV CFLAGS="-O3" 14 | ENV CXXFLAGS="-O3" 15 | ENV MAKEFLAGS="-j$(nproc)" 16 | 17 | RUN mkdir -p /opt/lmz 18 | WORKDIR /opt/lmz 19 | 20 | RUN git clone --depth 1 https://github.com/knifa/rpi-rgb-led-matrix.git \ 21 | && cd rpi-rgb-led-matrix/lib \ 22 | && make 23 | 24 | RUN mkdir -p /opt/lmz/led-matrix-zmq-server 25 | WORKDIR /opt/lmz/led-matrix-zmq-server 26 | COPY . . 27 | RUN mkdir -p build \ 28 | && cd build \ 29 | && cmake -DRPI_RGB_LED_MATRIX_DIR=/opt/lmz/rpi-rgb-led-matrix .. \ 30 | && make 31 | 32 | 33 | FROM alpine:latest AS run 34 | 35 | RUN apk add --no-cache \ 36 | libc++ \ 37 | libzmq 38 | 39 | RUN mkdir -p /opt/lmz 40 | WORKDIR /opt/lmz/ 41 | 42 | COPY --from=build \ 43 | /opt/lmz/led-matrix-zmq-server/build/led-matrix-zmq-* \ 44 | ./ 45 | 46 | ENV PATH="/opt/lmz:$PATH" 47 | CMD ["echo", "Please run a specific led-matrix-zmq binary!"] 48 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # led-matrix-zmq-server 2 | 3 | A tool for interacting with [rpi-rgb-led-matrix](https://github.com/hzeller/rpi-rgb-led-matrix/) over ZeroMQ. 4 | 5 | ## Building 6 | 7 | - Depends on `cppzmq` and friends. 8 | - Requires a built [rpi-rgb-led-matrix](https://github.com/hzeller/rpi-rgb-led-matrix/). Tell CMake where it is with `-DRPI_RGB_LED_MATRIX_DIR`. 9 | - Build with `cmake`, e.g.: 10 | 11 | ```shell 12 | mkdir build 13 | cd build 14 | cmake -DRPI_RGB_LED_MATRIX_DIR=/path/to/rpi-rgb-led-matrix .. 15 | make 16 | ``` 17 | 18 | ## Docker 19 | 20 | A [Docker image](https://github.com/Knifa/led-matrix-zmq-server/pkgs/container/led-matrix-zmq-server) is available for `amd64` and `arm64`. 21 | 22 | The server must be run with `--privileged` to allow GPIO access. This binary is only included in the `arm64` image. 23 | 24 | ```shell 25 | docker run \ 26 | --privileged \ 27 | --rm \ 28 | -v /run/lmz:/run/lmz \ 29 | ghcr.io/knifa/led-matrix-zmq-server:latest \ 30 | led-matrix-zmq-server \ 31 | --frame-endpoint ipc:///run/lmz/frame.sock \ 32 | --control-endpoint ipc:///run/lmz/control.sock \ 33 | --cols 64 \ 34 | --rows 64 35 | # ...etc 36 | ``` 37 | 38 | `led-matrix-zmq-control` and `led-matrix-zmq-pipe` are also available in the image. 39 | 40 | ```shell 41 | docker run \ 42 | --rm \ 43 | -v /var/run/lmz:/run/lmz \ 44 | ghcr.io/knifa/led-matrix-zmq-server:latest \ 45 | led-matrix-zmq-control \ 46 | --control-endpoint ipc:///run/lmz/control.sock \ 47 | set-brightness 128 48 | ``` 49 | 50 | ## Usage 51 | 52 | ### Running the Server 53 | 54 | See `led-matrix-zmq-server --help` for available options. These mostly passthrough to the `rpi-rgb-led-matrix` library. 55 | 56 | ```shell 57 | sudo ./led-matrix-zmq-server \ 58 | --cols 64 \ 59 | --rows 64 \ 60 | --chain-length 2 61 | # ...etc 62 | ``` 63 | 64 | #### Endpoints 65 | 66 | The `--xyz-endpoint` options pass directly through to ZeroMQ, so you can use any valid transport string. For example, you could specify `tcp://0.0.0.0:42069` to listen on the network. 67 | 68 | ### Sending Frames 69 | 70 | The server is a simple ZMQ REQ-REP loop. All you need to do is send your frame as a big ol' byte chunk then wait for an empty message back. Each frame should be in a RGBA32 format. 71 | 72 | #### Just Pipe It 73 | 74 | [led-matrix-zmq-pipe](src/pipe_main.cpp) is both a bit of an example and a handy tool. It reads raw RGBA32 frames from stdin and sends them to the server. 75 | 76 | ```shell 77 | # Use ffmpeg to convert a video to raw data. 78 | ffmpeg -re -i input.mp4 -vf scale=128:64 -f rawvideo -pix_fmt rgba - \ 79 | | sudo ./led-matrix-zmq-pipe -w 128 -h 64 80 | 81 | # Use imagemagick to resize and convert an image to raw data. 82 | convert input.png -resize 128x64^ rgba:- \ 83 | | sudo ./led-matrix-zmq-pipe -w 128 -h 64 84 | 85 | # Play a YouTube video. 86 | yt-dlp -f "bv*[height<=480]" "https://www.youtube.com/watch?v=FtutLA63Cp8" -o - \ 87 | | ffmpeg -re -i pipe: -vf scale=128:64 -f rawvideo -pix_fmt rgba - \ 88 | | sudo ./led-matrix-zmq-pipe -w 128 -h 64 89 | ``` 90 | 91 | ### Control Messages 92 | 93 | Brightness, color temperature, etc. can be get/set through another simple REQ-REP loop. 94 | 95 | See `led-matrix-zmq-control --help` for available options, or see [the source](src/control_main.cpp) to dig deeper. 96 | -------------------------------------------------------------------------------- /cmake/FindRpiRgbLedMatrix.cmake: -------------------------------------------------------------------------------- 1 | set(RPI_RGB_LED_MATRIX_DIR CACHE PATH "Path to rpi-rgb-led-matrix root directory") 2 | 3 | find_path(RpiRgbLedMatrix_INCLUDE_DIR REQUIRED 4 | NAMES led-matrix.h 5 | PATHS ${RPI_RGB_LED_MATRIX_DIR}/include 6 | ) 7 | 8 | find_library(RpiRgbLedMatrix_LIBRARY REQUIRED 9 | NAMES rgbmatrix 10 | PATHS ${RPI_RGB_LED_MATRIX_DIR}/lib 11 | ) 12 | 13 | include(FindPackageHandleStandardArgs) 14 | find_package_handle_standard_args(RpiRgbLedMatrix 15 | REQUIRED_VARS 16 | RpiRgbLedMatrix_INCLUDE_DIR 17 | RpiRgbLedMatrix_LIBRARY 18 | ) 19 | 20 | add_library(RpiRgbLedMatrix::RpiRgbLedMatrix UNKNOWN IMPORTED) 21 | set_target_properties(RpiRgbLedMatrix::RpiRgbLedMatrix PROPERTIES 22 | INTERFACE_INCLUDE_DIRECTORIES ${RpiRgbLedMatrix_INCLUDE_DIR} 23 | IMPORTED_LOCATION ${RpiRgbLedMatrix_LIBRARY} 24 | ) 25 | -------------------------------------------------------------------------------- /src/color_temp.cpp: -------------------------------------------------------------------------------- 1 | #include "color_temp.hpp" 2 | #include 3 | #include 4 | 5 | using color_temp::TemperatureColor; 6 | 7 | constexpr int color_temps_size = 48; 8 | 9 | std::array color_temps = {{ 10 | {255, 138, 18}, {255, 142, 33}, {255, 147, 44}, {255, 152, 54}, {255, 157, 63}, 11 | {255, 161, 72}, {255, 165, 79}, {255, 169, 87}, {255, 173, 94}, {255, 177, 101}, 12 | {255, 180, 107}, {255, 184, 114}, {255, 187, 120}, {255, 190, 126}, {255, 193, 132}, 13 | {255, 196, 137}, {255, 199, 143}, {255, 201, 148}, {255, 204, 153}, {255, 206, 159}, 14 | {255, 209, 163}, {255, 211, 168}, {255, 213, 173}, {255, 215, 177}, {255, 217, 182}, 15 | {255, 219, 186}, {255, 221, 190}, {255, 223, 194}, {255, 225, 198}, {255, 227, 202}, 16 | {255, 228, 206}, {255, 230, 210}, {255, 232, 213}, {255, 233, 217}, {255, 235, 220}, 17 | {255, 236, 224}, {255, 238, 227}, {255, 239, 230}, {255, 240, 233}, {255, 242, 236}, 18 | {255, 243, 239}, {255, 244, 242}, {255, 245, 245}, {255, 246, 247}, {255, 248, 251}, 19 | {255, 249, 253}, {254, 252, 255}, {255, 255, 255}, 20 | }}; 21 | 22 | TemperatureColor color_temp::get(int kelvin) { 23 | if (kelvin < color_temp::min) { 24 | kelvin = color_temp::min; 25 | } else if (kelvin > color_temp::max) { 26 | kelvin = color_temp::max; 27 | } 28 | 29 | const auto index_fract = 30 | float(kelvin - color_temp::min) / float(color_temp::max - color_temp::min); 31 | const auto index_a = static_cast(index_fract * (color_temps.size() - 1)); 32 | const auto index_b = index_a + 1; 33 | 34 | const auto fract = index_fract * float(color_temps_size - 1) - index_a; 35 | 36 | const auto ca = color_temps[index_a]; 37 | const auto cb = color_temps[index_b]; 38 | 39 | const auto r = std::get<0>(ca) * (1.0 - fract) + std::get<0>(cb) * fract; 40 | const auto g = std::get<1>(ca) * (1.0 - fract) + std::get<1>(cb) * fract; 41 | const auto b = std::get<2>(ca) * (1.0 - fract) + std::get<2>(cb) * fract; 42 | 43 | return std::make_tuple(r, g, b); 44 | } 45 | -------------------------------------------------------------------------------- /src/color_temp.hpp: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #include 4 | 5 | namespace color_temp { 6 | constexpr int min = 2000; 7 | constexpr int max = 6500; 8 | 9 | using TemperatureColor = std::tuple; 10 | 11 | TemperatureColor get(int kelvin); 12 | } // namespace color_temp 13 | -------------------------------------------------------------------------------- /src/consts.hpp: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #include 4 | 5 | namespace consts { 6 | 7 | constexpr auto pixel_size = sizeof(std::uint32_t); 8 | constexpr auto bpp = 8 * pixel_size; 9 | 10 | const auto default_control_endpoint = "ipc:///run/lmz-control.sock"; 11 | const auto default_frame_endpoint = "ipc:///run/lmz-frame.sock"; 12 | 13 | } // namespace consts 14 | -------------------------------------------------------------------------------- /src/control_main.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | 11 | #include "consts.hpp" 12 | #include "messages.hpp" 13 | 14 | template 15 | const static lmz::MessageReplyType send_and_recv(zmq::socket_t &sock, 16 | const SendType &send_msg) { 17 | zmq::message_t zmq_req(&send_msg, sizeof(send_msg)); 18 | sock.send(zmq_req, zmq::send_flags::none); 19 | 20 | zmq::message_t zmq_rep; 21 | static_cast(sock.recv(zmq_rep, zmq::recv_flags::none)); 22 | 23 | const auto data = std::span(zmq_rep.data(), zmq_rep.size()); 24 | return lmz::get_message_from_data>(data); 25 | } 26 | 27 | int main(int argc, char *argv[]) { 28 | static plog::ColorConsoleAppender consoleAppender; 29 | plog::init(plog::debug, &consoleAppender); 30 | 31 | argparse::ArgumentParser program("led-matrix-zmq-control"); 32 | program.add_description("Send control messages to led-matrix-zmq-server"); 33 | program.add_argument("--control-endpoint").default_value(consts::default_control_endpoint); 34 | 35 | argparse::ArgumentParser set_brightness_command("set-brightness"); 36 | set_brightness_command.add_description("Set the brightness"); 37 | set_brightness_command.add_argument("brightness") 38 | .help("Brightness level (0-255)") 39 | .scan<'i', int>(); 40 | argparse::ArgumentParser set_temperature_command("set-temperature"); 41 | set_temperature_command.add_description("Set the color temperature"); 42 | set_temperature_command.add_argument("temperature") 43 | .help("Temperature level (2000K-6500K)") 44 | .scan<'i', int>(); 45 | 46 | argparse::ArgumentParser get_brightness_command("get-brightness"); 47 | get_brightness_command.add_description("Get the brightness"); 48 | argparse::ArgumentParser get_temperature_command("get-temperature"); 49 | get_temperature_command.add_description("Get the color temperature"); 50 | 51 | argparse::ArgumentParser get_configuration_command("get-configuration"); 52 | get_configuration_command.add_description("Get the configuration"); 53 | 54 | program.add_subparser(get_brightness_command); 55 | program.add_subparser(set_brightness_command); 56 | program.add_subparser(get_temperature_command); 57 | program.add_subparser(set_temperature_command); 58 | program.add_subparser(get_configuration_command); 59 | 60 | try { 61 | program.parse_args(argc, argv); 62 | } catch (const std::runtime_error &err) { 63 | std::cerr << err.what() << std::endl; 64 | std::cerr << program; 65 | return 1; 66 | } 67 | 68 | zmq::context_t ctx; 69 | zmq::socket_t sock(ctx, ZMQ_REQ); 70 | sock.set(zmq::sockopt::linger, 0); 71 | sock.set(zmq::sockopt::rcvtimeo, 1000); 72 | sock.set(zmq::sockopt::sndtimeo, 1000); 73 | sock.connect(program.get("--control-endpoint")); 74 | 75 | zmq::message_t zmq_req, zmq_rep; 76 | 77 | if (program.is_subcommand_used(set_brightness_command)) { 78 | const auto brightness = set_brightness_command.get("brightness"); 79 | PLOG_INFO << "Setting brightness to " << brightness << ""; 80 | 81 | const lmz::SetBrightnessRequest control_req = { 82 | .args = {.brightness = static_cast(brightness)}, 83 | }; 84 | 85 | send_and_recv(sock, control_req); 86 | } else if (program.is_subcommand_used(set_temperature_command)) { 87 | const auto temperature = set_temperature_command.get("temperature"); 88 | PLOG_INFO << "Setting temperature to " << temperature << "K"; 89 | 90 | const lmz::SetTemperatureRequest control_req = { 91 | .args = {.temperature = static_cast(temperature)}, 92 | }; 93 | 94 | send_and_recv(sock, control_req); 95 | } else if (program.is_subcommand_used(get_brightness_command)) { 96 | const auto resp_msg = send_and_recv(sock, lmz::GetBrightnessRequest{}); 97 | 98 | std::cout << std::to_string(resp_msg.args.brightness) << std::endl; 99 | } else if (program.is_subcommand_used(get_temperature_command)) { 100 | const auto res_msg = send_and_recv(sock, lmz::GetTemperatureRequest{}); 101 | 102 | std::cout << std::to_string(res_msg.args.temperature) << std::endl; 103 | } else if (program.is_subcommand_used(get_configuration_command)) { 104 | const auto res_msg = send_and_recv(sock, lmz::GetConfigurationRequest{}); 105 | 106 | std::cout << std::to_string(res_msg.args.width) << " " << std::to_string(res_msg.args.height) 107 | << std::endl; 108 | } else { 109 | std::cerr << program; 110 | return 1; 111 | } 112 | 113 | return 0; 114 | } 115 | -------------------------------------------------------------------------------- /src/messages.hpp: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | 9 | namespace lmz { 10 | 11 | enum class MessageId : std::uint8_t { 12 | NullReply, 13 | 14 | GetBrightnessRequest, 15 | GetBrightnessReply, 16 | SetBrightnessRequest, 17 | 18 | GetTemperatureRequest, 19 | GetTemperatureReply, 20 | SetTemperatureRequest, 21 | 22 | GetConfigurationRequest, 23 | GetConfigurationReply, 24 | }; 25 | 26 | namespace { 27 | 28 | constexpr MessageId message_id_min = MessageId::NullReply; 29 | constexpr MessageId message_id_max = MessageId::GetConfigurationReply; 30 | 31 | #pragma pack(push, 1) 32 | 33 | struct NullArgs {}; 34 | 35 | struct BrightnessArgs { 36 | uint8_t brightness; 37 | }; 38 | 39 | struct ConfigurationArgs { 40 | uint16_t width; 41 | uint16_t height; 42 | }; 43 | 44 | struct TemperatureArgs { 45 | uint16_t temperature; 46 | }; 47 | 48 | template struct Message { 49 | const MessageId id = Id; 50 | ArgsT args; 51 | 52 | static constexpr auto id_value = Id; 53 | static constexpr auto size_value = sizeof(id) + sizeof(args); 54 | }; 55 | 56 | #pragma pack(pop) 57 | 58 | } // namespace 59 | 60 | template 61 | concept IsMessage = requires { 62 | { T::id_value } -> std::convertible_to; 63 | { T::size_value } -> std::convertible_to; 64 | }; 65 | 66 | using NullReply = Message; 67 | 68 | using GetBrightnessRequest = Message; 69 | using GetBrightnessReply = Message; 70 | using SetBrightnessRequest = Message; 71 | 72 | using GetTemperatureRequest = Message; 73 | using GetTemperatureReply = Message; 74 | using SetTemperatureRequest = Message; 75 | 76 | using GetConfigurationRequest = Message; 77 | using GetConfigurationReply = Message; 78 | 79 | namespace { 80 | template struct MessageRequestReply { 81 | static_assert(false, "No reply type defined for this message"); 82 | }; 83 | 84 | template <> struct MessageRequestReply { 85 | using ReplyType = GetBrightnessReply; 86 | }; 87 | 88 | template <> struct MessageRequestReply { 89 | using ReplyType = NullReply; 90 | }; 91 | 92 | template <> struct MessageRequestReply { 93 | using ReplyType = GetTemperatureReply; 94 | }; 95 | 96 | template <> struct MessageRequestReply { 97 | using ReplyType = NullReply; 98 | }; 99 | 100 | template <> struct MessageRequestReply { 101 | using ReplyType = GetConfigurationReply; 102 | }; 103 | } // namespace 104 | 105 | template 106 | using MessageReplyType = typename MessageRequestReply::ReplyType; 107 | 108 | inline MessageId get_id_from_data(const std::span &data) { 109 | using UnderlyingType = std::underlying_type_t; 110 | 111 | if (data.size() < sizeof(UnderlyingType)) { 112 | throw std::runtime_error("Received empty control message"); 113 | } 114 | 115 | UnderlyingType id_underlying = static_cast(data[0]); 116 | if (id_underlying < static_cast(message_id_min) || 117 | id_underlying > static_cast(message_id_max)) { 118 | throw std::runtime_error("Received control message with invalid type"); 119 | } 120 | 121 | return static_cast(id_underlying); 122 | } 123 | 124 | template 125 | MessageT get_message_from_data(const std::span &data) { 126 | if (data.size() != MessageT::size_value) { 127 | throw std::runtime_error("Received control message of unexpected size"); 128 | } 129 | 130 | if (get_id_from_data(data) != MessageT::id_value) { 131 | throw std::runtime_error("Received control message with unexpected type"); 132 | } 133 | 134 | MessageT msg; 135 | std::copy(data.begin(), data.end(), reinterpret_cast(&msg)); 136 | return msg; 137 | } 138 | 139 | } // namespace lmz 140 | -------------------------------------------------------------------------------- /src/pipe_main.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | 10 | #include "consts.hpp" 11 | 12 | int main(int argc, char *argv[]) { 13 | static plog::ColorConsoleAppender consoleAppender; 14 | plog::init(plog::debug, &consoleAppender); 15 | 16 | argparse::ArgumentParser program("led-matrix-zmq-pipe"); 17 | program.add_description("Reads raw frames from stdin and sends them to led-matrix-zmq-server"); 18 | 19 | program.add_argument("-w", "--width").default_value(32).scan<'i', int>(); 20 | program.add_argument("-h", "--height").default_value(32).scan<'i', int>(); 21 | program.add_argument("-f", "--frame-endpoint").default_value(consts::default_frame_endpoint); 22 | 23 | try { 24 | program.parse_args(argc, argv); 25 | } catch (const std::runtime_error &err) { 26 | std::cerr << err.what() << std::endl; 27 | std::cerr << program; 28 | return 1; 29 | } 30 | 31 | int width = program.get("--width"); 32 | int height = program.get("--height"); 33 | std::string frame_endpoint = program.get("--frame-endpoint"); 34 | 35 | zmq::context_t ctx; 36 | zmq::socket_t sock(ctx, zmq::socket_type::req); 37 | sock.connect(frame_endpoint); 38 | 39 | size_t frame_size = width * height * consts::pixel_size; 40 | std::vector frame(frame_size); 41 | 42 | PLOG_INFO << "Sending frames to " << frame_endpoint; 43 | PLOG_INFO << "Expected frame size: " << frame_size << " bytes" << " (" << width << "x" << height 44 | << "x" << consts::bpp << ")"; 45 | 46 | while (std::cin.read(frame.data(), frame_size)) { 47 | if (std::cin.eof()) { 48 | break; 49 | } 50 | 51 | zmq::const_buffer req(frame.data(), frame_size); 52 | sock.send(req, zmq::send_flags::none); 53 | 54 | zmq::message_t rep; 55 | static_cast(sock.recv(rep)); 56 | } 57 | 58 | return 0; 59 | } 60 | -------------------------------------------------------------------------------- /src/server_main.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | 13 | #include "color_temp.hpp" 14 | #include "consts.hpp" 15 | #include "messages.hpp" 16 | 17 | namespace frame_task { 18 | 19 | static std::string frame_endpoint; 20 | 21 | static std::recursive_mutex matrix_mutex; 22 | 23 | static rgb_matrix::RGBMatrix *matrix; 24 | static int matrix_width; 25 | static int matrix_height; 26 | 27 | static std::vector frame_buffer(0); 28 | 29 | static int brightness_current; 30 | 31 | static int color_temp_current_k; 32 | static std::tuple color_temp_current; 33 | 34 | static void render_test_pattern() { 35 | const std::lock_guard guard(matrix_mutex); 36 | 37 | std::vector pixels(matrix_width * matrix_height); 38 | for (auto y = 0; y < matrix_height; ++y) { 39 | for (auto x = 0; x < matrix_width; ++x) { 40 | auto b = (y * 255) / matrix_height; 41 | auto g = (x * 255) / matrix_width; 42 | auto r = 255 - b; 43 | 44 | pixels[y * matrix_width + x] = (r << 0) | (g << 8) | (b << 16); 45 | } 46 | } 47 | 48 | std::span data(reinterpret_cast(pixels.data()), 49 | pixels.size() * sizeof(std::uint32_t)); 50 | frame_buffer.assign(data.begin(), data.end()); 51 | } 52 | 53 | static void update_matrix() { 54 | const std::lock_guard guard(matrix_mutex); 55 | 56 | std::span data(reinterpret_cast(frame_buffer.data()), 57 | frame_buffer.size() / sizeof(std::uint32_t)); 58 | 59 | for (auto y = 0; y < matrix_height; ++y) { 60 | for (auto x = 0; x < matrix_width; ++x) { 61 | const auto pixel = data[y * matrix_width + x]; 62 | auto r = (pixel >> 0) & 0xFF; 63 | auto g = (pixel >> 8) & 0xFF; 64 | auto b = (pixel >> 16) & 0xFF; 65 | 66 | r = (r * brightness_current) / 255; 67 | g = (g * brightness_current) / 255; 68 | b = (b * brightness_current) / 255; 69 | 70 | r = (r * std::get<0>(color_temp_current)) / 255; 71 | g = (g * std::get<1>(color_temp_current)) / 255; 72 | b = (b * std::get<2>(color_temp_current)) / 255; 73 | 74 | matrix->SetPixel(x, y, r, g, b); 75 | } 76 | } 77 | } 78 | 79 | static void set_brightness(int brightness) { 80 | const std::lock_guard guard(matrix_mutex); 81 | brightness_current = std::clamp(brightness, 0, 255); 82 | update_matrix(); 83 | } 84 | 85 | static int get_brightness() { 86 | const std::lock_guard guard(matrix_mutex); 87 | return brightness_current; 88 | } 89 | 90 | static void set_temperature(int temperature) { 91 | const std::lock_guard guard(matrix_mutex); 92 | color_temp_current_k = std::clamp(temperature, color_temp::min, color_temp::max); 93 | color_temp_current = color_temp::get(temperature); 94 | update_matrix(); 95 | } 96 | 97 | static int get_temperature() { 98 | const std::lock_guard guard(matrix_mutex); 99 | return color_temp_current_k; 100 | } 101 | 102 | static void loop() { 103 | zmq::context_t ctx; 104 | zmq::socket_t sock(ctx, zmq::socket_type::rep); 105 | sock.bind(frame_endpoint); 106 | 107 | PLOG_INFO << "Listening for frames on " << frame_endpoint; 108 | PLOG_INFO << "Expected frame size: " << frame_buffer.size() << " bytes" << " (" << matrix_width 109 | << "x" << matrix_height << "x" << consts::bpp << "bpp)"; 110 | 111 | while (true) { 112 | zmq::message_t req; 113 | static_cast(sock.recv(req, zmq::recv_flags::none)); 114 | sock.send(zmq::message_t(), zmq::send_flags::none); 115 | 116 | if (req.size() != frame_buffer.size()) { 117 | PLOG_ERROR << "Received frame of unexpected size: " << req.size() << ", expected " 118 | << frame_buffer.size(); 119 | continue; 120 | } 121 | 122 | const std::lock_guard guard(matrix_mutex); 123 | auto data = req.data(); 124 | frame_buffer.assign(data, data + req.size()); 125 | update_matrix(); 126 | } 127 | } 128 | 129 | } // namespace frame_task 130 | 131 | namespace control_task { 132 | 133 | static std::string control_endpoint; 134 | 135 | zmq::context_t ctx; 136 | zmq::socket_t sock(ctx, zmq::socket_type::rep); 137 | 138 | template 139 | static lmz::MessageReplyType process_request(const RequestT &) { 140 | static_assert(false, "No process implementation for this message"); 141 | } 142 | 143 | template <> lmz::GetBrightnessReply process_request(const lmz::GetBrightnessRequest &) { 144 | return lmz::GetBrightnessReply{ 145 | .args = {.brightness = static_cast(frame_task::get_brightness())}, 146 | }; 147 | } 148 | 149 | template <> lmz::NullReply process_request(const lmz::SetBrightnessRequest &req_msg) { 150 | PLOG_INFO << "Setting brightness to " << std::to_string(req_msg.args.brightness) << ""; 151 | 152 | frame_task::set_brightness(req_msg.args.brightness); 153 | 154 | return lmz::NullReply{}; 155 | } 156 | 157 | template <> lmz::GetTemperatureReply process_request(const lmz::GetTemperatureRequest &) { 158 | return lmz::GetTemperatureReply{ 159 | .args = {.temperature = static_cast(frame_task::get_temperature())}, 160 | }; 161 | } 162 | 163 | template <> lmz::NullReply process_request(const lmz::SetTemperatureRequest &req_msg) { 164 | if (req_msg.args.temperature < color_temp::min || req_msg.args.temperature > color_temp::max) { 165 | PLOG_ERROR << "Received invalid temperature: " << req_msg.args.temperature << "K"; 166 | return lmz::NullReply{}; 167 | } 168 | PLOG_INFO << "Setting temperature to " << std::to_string(req_msg.args.temperature) << "K"; 169 | 170 | frame_task::set_temperature(req_msg.args.temperature); 171 | 172 | return lmz::NullReply{}; 173 | } 174 | 175 | template <> lmz::GetConfigurationReply process_request(const lmz::GetConfigurationRequest &) { 176 | return lmz::GetConfigurationReply{ 177 | .args = {.width = static_cast(frame_task::matrix_width), 178 | .height = static_cast(frame_task::matrix_height)}, 179 | }; 180 | } 181 | 182 | template void process_message(const std::span &data) { 183 | const auto req_msg = lmz::get_message_from_data(data); 184 | const auto reply = process_request(req_msg); 185 | sock.send(zmq::const_buffer(&reply, sizeof(reply)), zmq::send_flags::none); 186 | } 187 | 188 | static void loop() { 189 | sock.bind(control_endpoint); 190 | 191 | PLOG_INFO << "Listening for control messages on " << control_endpoint; 192 | 193 | while (true) { 194 | zmq::message_t req; 195 | static_cast(sock.recv(req, zmq::recv_flags::none)); 196 | 197 | const auto data = std::span(req.data(), req.size()); 198 | const auto id = lmz::get_id_from_data(data); 199 | 200 | switch (id) { 201 | case lmz::MessageId::GetBrightnessRequest: { 202 | process_message(data); 203 | } break; 204 | case lmz::MessageId::SetBrightnessRequest: { 205 | process_message(data); 206 | } break; 207 | case lmz::MessageId::GetTemperatureRequest: { 208 | process_message(data); 209 | } break; 210 | case lmz::MessageId::SetTemperatureRequest: { 211 | process_message(data); 212 | } break; 213 | case lmz::MessageId::GetConfigurationRequest: { 214 | process_message(data); 215 | } break; 216 | default: { 217 | PLOG_ERROR << "Received control message with invalid type"; 218 | } break; 219 | } 220 | } 221 | } 222 | 223 | } // namespace control_task 224 | 225 | static void setup(int argc, char *argv[]) { 226 | static plog::ColorConsoleAppender consoleAppender; 227 | plog::init(plog::debug, &consoleAppender); 228 | 229 | argparse::ArgumentParser parser("led-matrix-zmq-server"); 230 | 231 | parser.add_argument("--rows").default_value(32).scan<'i', int>(); 232 | parser.add_argument("--cols").default_value(32).scan<'i', int>(); 233 | parser.add_argument("--chain-length").default_value(1).scan<'i', int>(); 234 | parser.add_argument("--parallel").default_value(1).scan<'i', int>(); 235 | 236 | parser.add_argument("--pixel-mapper"); 237 | parser.add_argument("--hardware-mapping"); 238 | 239 | parser.add_argument("--pwm-lsb-ns").default_value(100).scan<'i', int>(); 240 | parser.add_argument("--pwm-bits").default_value(11).scan<'i', int>(); 241 | parser.add_argument("--pwm-dither-bits").default_value(2).scan<'i', int>(); 242 | parser.add_argument("--gpio-slowdown").default_value(4).scan<'i', int>(); 243 | 244 | parser.add_argument("--limit-hz").default_value(200).scan<'i', int>(); 245 | parser.add_argument("--show-hz").default_value(false).implicit_value(true); 246 | 247 | parser.add_argument("--frame-endpoint").default_value(consts::default_frame_endpoint); 248 | parser.add_argument("--control-endpoint").default_value(consts::default_control_endpoint); 249 | 250 | parser.add_argument("--brightness") 251 | .help("Initial brightness (0-255)") 252 | .default_value(255) 253 | .scan<'i', int>(); 254 | parser.add_argument("--temperature") 255 | .help(std::format("Initial color temperature ({}-{}K)", color_temp::min, color_temp::max)) 256 | .default_value(color_temp::max) 257 | .scan<'i', int>(); 258 | 259 | parser.add_argument("--no-test-pattern").default_value(false).implicit_value(true); 260 | 261 | parser.parse_args(argc, argv); 262 | 263 | if (getuid() != 0) { 264 | PLOG_WARNING << "You probably want to run this as root."; 265 | } 266 | 267 | { 268 | using namespace frame_task; 269 | 270 | frame_endpoint = parser.get("--frame-endpoint"); 271 | 272 | static rgb_matrix::RGBMatrix::Options matrix_opts; 273 | static rgb_matrix::RuntimeOptions matrix_runtime_opts; 274 | 275 | matrix_opts.rows = parser.get("--rows"); 276 | matrix_opts.cols = parser.get("--cols"); 277 | matrix_opts.chain_length = parser.get("--chain-length"); 278 | matrix_opts.parallel = parser.get("--parallel"); 279 | 280 | if (parser.present("--pixel-mapper")) { 281 | static std::string matrix_opts_pixel_mapper = 282 | std::string(parser.get("--pixel-mapper")); 283 | matrix_opts.pixel_mapper_config = matrix_opts_pixel_mapper.c_str(); 284 | } 285 | 286 | if (parser.present("--hardware-mapping")) { 287 | static std::string matrix_opts_led_rgb_sequence = 288 | std::string(parser.get("--hardware-mapping")); 289 | matrix_opts.hardware_mapping = matrix_opts_led_rgb_sequence.c_str(); 290 | } 291 | 292 | matrix_opts.pwm_lsb_nanoseconds = parser.get("--pwm-lsb-ns"); 293 | matrix_opts.pwm_bits = parser.get("--pwm-bits"); 294 | matrix_opts.pwm_dither_bits = parser.get("--pwm-dither-bits"); 295 | 296 | matrix_opts.limit_refresh_rate_hz = parser.get("--limit-hz"); 297 | matrix_opts.show_refresh_rate = parser.get("--show-hz"); 298 | 299 | matrix_runtime_opts.daemon = 0; 300 | matrix_runtime_opts.drop_privileges = 0; 301 | matrix_runtime_opts.gpio_slowdown = parser.get("--gpio-slowdown"); 302 | 303 | matrix = rgb_matrix::RGBMatrix::CreateFromOptions(matrix_opts, matrix_runtime_opts); 304 | matrix->set_luminance_correct(true); 305 | 306 | matrix_width = matrix->width(); 307 | matrix_height = matrix->height(); 308 | frame_buffer.resize(matrix_width * matrix_height * consts::bpp); 309 | 310 | auto brightness_arg = parser.get("--brightness"); 311 | if (brightness_arg < 0 || brightness_arg > 255) { 312 | std::cerr << "Invalid brightness value: " << brightness_arg << std::endl; 313 | std::exit(1); 314 | } else { 315 | brightness_current = brightness_arg; 316 | } 317 | 318 | auto color_temp_arg = parser.get("--temperature"); 319 | if (color_temp_arg < color_temp::min || color_temp_arg > color_temp::max) { 320 | std::cerr << "Invalid temperature value: " << color_temp_arg << std::endl; 321 | std::exit(1); 322 | } else { 323 | color_temp_current_k = color_temp_arg; 324 | color_temp_current = color_temp::get(color_temp_current_k); 325 | } 326 | 327 | if (!parser.get("--no-test-pattern")) { 328 | render_test_pattern(); 329 | update_matrix(); 330 | } 331 | } 332 | 333 | { 334 | using namespace control_task; 335 | control_endpoint = parser.get("--control-endpoint"); 336 | } 337 | } 338 | 339 | int main(int argc, char *argv[]) { 340 | setup(argc, argv); 341 | 342 | auto frame_thread = std::thread(frame_task::loop); 343 | auto control_thread = std::thread(control_task::loop); 344 | 345 | frame_thread.join(); 346 | control_thread.join(); 347 | 348 | return 0; 349 | } 350 | -------------------------------------------------------------------------------- /src/virtual_main.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | #include 5 | #include 6 | #include 7 | 8 | #include "consts.hpp" 9 | 10 | class Options { 11 | public: 12 | std::string frame_endpoint; 13 | int width; 14 | int height; 15 | int scale; 16 | 17 | static Options from_args(int argc, char *argv[]) { 18 | argparse::ArgumentParser parser("led-matrix-zmq-virtual"); 19 | 20 | parser.add_argument("--width").default_value(32).scan<'i', int>(); 21 | parser.add_argument("--height").default_value(32).scan<'i', int>(); 22 | parser.add_argument("--scale").default_value(-1).scan<'i', int>(); 23 | parser.add_argument("--frame-endpoint").default_value(consts::default_frame_endpoint); 24 | 25 | parser.parse_args(argc, argv); 26 | 27 | return Options{ 28 | .frame_endpoint = parser.get("--frame-endpoint"), 29 | .width = parser.get("--width"), 30 | .height = parser.get("--height"), 31 | .scale = parser.get("--scale"), 32 | }; 33 | ; 34 | } 35 | }; 36 | ; 37 | 38 | int main(int argc, char *argv[]) { 39 | const auto options = Options::from_args(argc, argv); 40 | 41 | SDL_Init(SDL_INIT_VIDEO); 42 | 43 | auto scale = options.scale; 44 | if (options.scale < 0) { 45 | SDL_Rect bounds; 46 | SDL_GetDisplayBounds(0, &bounds); 47 | 48 | bounds.w *= 0.8; 49 | bounds.h *= 0.8; 50 | 51 | scale = std::min(bounds.w / options.width, bounds.h / options.height); 52 | } 53 | 54 | const auto win_width = options.width * scale; 55 | const auto win_height = options.height * scale; 56 | 57 | auto *window = SDL_CreateWindow("led-matrix-zmq-virtual", SDL_WINDOWPOS_UNDEFINED, 58 | SDL_WINDOWPOS_UNDEFINED, win_width, win_height, 0); 59 | auto *renderer = SDL_CreateRenderer(window, -1, 0); 60 | auto *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STREAMING, 61 | options.width, options.height); 62 | 63 | zmq::context_t zmq_ctx; 64 | zmq::socket_t zmq_sock(zmq_ctx, zmq::socket_type::rep); 65 | zmq_sock.bind(options.frame_endpoint); 66 | 67 | auto running = true; 68 | while (running) { 69 | SDL_Event event; 70 | while (SDL_PollEvent(&event)) { 71 | if (event.type == SDL_QUIT) { 72 | running = false; 73 | } 74 | } 75 | 76 | void *tex_pixels; 77 | int tex_pitch; 78 | SDL_LockTexture(texture, nullptr, &tex_pixels, &tex_pitch); 79 | 80 | zmq::message_t req; 81 | static_cast(zmq_sock.recv(req, zmq::recv_flags::none)); 82 | zmq_sock.send(zmq::message_t(), zmq::send_flags::none); 83 | 84 | if (req.size() != options.width * options.height * consts::pixel_size) { 85 | throw std::runtime_error("Invalid frame size"); 86 | } 87 | 88 | std::memcpy(tex_pixels, req.data(), req.size()); 89 | 90 | SDL_UnlockTexture(texture); 91 | SDL_RenderCopy(renderer, texture, nullptr, nullptr); 92 | SDL_RenderPresent(renderer); 93 | } 94 | 95 | zmq_sock.close(); 96 | zmq_ctx.close(); 97 | 98 | SDL_DestroyTexture(texture); 99 | SDL_DestroyRenderer(renderer); 100 | SDL_DestroyWindow(window); 101 | SDL_Quit(); 102 | 103 | return 0; 104 | } 105 | --------------------------------------------------------------------------------