Merge pull request 'Feature/video in' (#3) from feature/video-in into main

Reviewed-on: #3

CMakeLists.txt

@@ -73,18 +73,40 @@ FetchContent_Declare(json
     URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz)
 FetchContent_MakeAvailable(json)
 
+# ── FFmpeg ──────────────────────────────────────────────────────────────────
+find_package(PkgConfig REQUIRED)
+
+# Check for FFmpeg components
+pkg_check_modules(FFMPEG REQUIRED
+    libavformat
+    libavcodec
+    libswscale
+    libavutil
+    libswresample
+)
+
+# Create an interface library for FFmpeg
+add_library(ffmpeg INTERFACE)
+target_include_directories(ffmpeg INTERFACE ${FFMPEG_INCLUDE_DIRS})
+target_link_libraries(ffmpeg INTERFACE ${FFMPEG_LIBRARIES})
+
 # ── Shared utilities (Signal.hpp, NodeBase.hpp, FlowDef.hpp, V210.hpp) ───────
 add_library(dmf-shared INTERFACE)
 target_include_directories(dmf-shared INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/shared)
 target_link_libraries(dmf-shared INTERFACE mxl nlohmann_json::nlohmann_json)
 
+# ── Basic nodes ──────────────────────────────────────────────────────────────
 add_subdirectory(nodes/testpattern)
 add_subdirectory(nodes/fakesink)
 
+# ── NDI nodes ────────────────────────────────────────────────────────────────
 set(NDI_SDK_DIR "" CACHE PATH "Path to NDI SDK root")
 if(NDI_SDK_DIR)
     add_subdirectory(nodes/ndiout)
     add_subdirectory(nodes/ndiin)
 endif()
 
+add_subdirectory(nodes/videoin)
+
+# ── Core server ──────────────────────────────────────────────────────────────
 add_subdirectory(studio-manager)

graph.json

@@ -5,8 +5,8 @@
   ],
   "edges": [
     {
-      "from": "testpattern", "from_port": "flow_id",
+      "from": "testpattern", "from_port": "video_flow_id",
-      "to":   "ndiout",      "to_port":   "flow_id",
+      "to":   "ndiout",      "to_port":   "video_flow_id",
       "format": { "kind": "video", "width": 1920, "height": 1080, "fps_num": 25, "fps_den": 1 }
     },
     {

nodes/fakesink/main.cpp

@@ -6,7 +6,7 @@
 
 class FakeSinkNode : public dmf::NodeBase {
     void run() override {
-        const auto flow_info = config().at("flow_id");
+        const auto flow_info = config().at("video_flow_id");
         const auto flow_id   = flow_info.at("id").get<std::string>();
         const int  fps_num   = flow_info.value("fps_num", 25);
         const int  fps_den   = flow_info.value("fps_den", 1);

nodes/ndiin/main.cpp

@@ -145,6 +145,9 @@ class NDIInNode : public dmf::NodeBase {
                     }
                     grain.validSlices = grain.totalSlices;
                     mxlFlowWriterCommitGrain(video_writer, &grain);
+                    const uint64_t ns = mxlGetNsUntilIndex(video_index + 1, &video_rate);
+                    if (ns > 0 && ns < 2'000'000'000ULL) mxlSleepForNs(ns);
+                    video_index++;
                 } else {
                     log("video OpenGrain failed (%s) at index=%llu", dmf::mxl_status_str(st), video_index);
                 }

nodes/ndiout/main.cpp

@@ -34,7 +34,7 @@ struct NDIContext {
 class NDIOutNode : public dmf::NodeBase {
     void run() override {
         // --- video flow (optional) ---
-        bool has_video = config().contains("flow_id");
+        bool has_video = config().contains("video_flow_id");
 
         int         width        = 1920;
         int         height       = 1080;
@@ -45,7 +45,7 @@ class NDIOutNode : public dmf::NodeBase {
         uint32_t          video_stride = 0;
 
         if (has_video) {
-            const auto flow_info = config().at("flow_id");
+            const auto flow_info = config().at("video_flow_id");
             flow_id  = flow_info.at("id").get<std::string>();
             width    = flow_info.value("width",   1920);
             height   = flow_info.value("height",  1080);

nodes/testpattern/main.cpp

@@ -10,7 +10,7 @@
 class TestPatternNode : public dmf::NodeBase {
     void run() override {
         // --- video flow ---
-        const auto flow_info = config().at("flow_id");
+        const auto flow_info = config().at("video_flow_id");
         const auto flow_id   = flow_info.at("id").get<std::string>();
         const int  width     = flow_info.value("width",   1920);
         const int  height    = flow_info.value("height",  1080);

nodes/videoin/CMakeLists.txt

@@ -0,0 +1,8 @@
+add_executable(dmf-node-videoin main.cpp)
+target_compile_features(dmf-node-videoin PRIVATE cxx_std_20)
+target_link_libraries(dmf-node-videoin
+    PRIVATE
+    dmf-shared
+    ffmpeg
+)
+install(TARGETS dmf-node-videoin RUNTIME DESTINATION bin)

nodes/videoin/main.cpp

@@ -0,0 +1,181 @@
+#include <string>
+#include <mxl/flow.h>
+#include <mxl/time.h>
+#include "V210.hpp"
+#include "FlowDef.hpp"
+#include "NodeBase.hpp"
+#include "VideoReader.hpp"
+
+class VideoInNode : public dmf::NodeBase {
+    void run() override {
+        const std::string filename = config().value("file", std::string{});
+        if (filename.empty()) { log("config missing 'file'"); return; }
+        log("file: %s", filename.c_str());
+
+        // Audio pacing assumes steady fixed-size chunks from the demuxer (e.g. 1024-sample AAC
+        // packets in MPEG-TS). Containers like MP4/MKV can deliver audio in large bursts, which
+        // would require a separate metering buffer to pace correctly. Stick to .ts for now.
+        dmf::VideoReader video_reader(filename);
+        if (!video_reader.has_video && !video_reader.has_audio) {
+            log("no video or audio stream found"); return;
+        }
+
+        const bool has_video = config().contains("video_flow_id") && video_reader.has_video;
+        mxlFlowWriter     video_writer = nullptr;
+        mxlFlowConfigInfo video_cfg{};
+        uint32_t   video_stride = 0;
+        int        width = 0, height = 0, fps_num = 25, fps_den = 1;
+        std::string video_flow_id;
+
+        if (has_video) {
+            const auto video_flow_info = config().at("video_flow_id");
+            video_flow_id = video_flow_info.at("id").get<std::string>();
+            width    = video_flow_info.value("width",   video_reader.video_info.width);
+            height   = video_flow_info.value("height",  video_reader.video_info.height);
+            fps_num  = video_flow_info.value("fps_num", video_reader.video_info.fps_num);
+            fps_den  = video_flow_info.value("fps_den", video_reader.video_info.fps_den);
+
+            log("video flow=%s  %dx%d @ %d/%d fps", video_flow_id.c_str(), width, height, fps_num, fps_den);
+
+            bool created = false;
+            mxlStatus vst = mxlCreateFlowWriter(
+                instance(),
+                dmf::make_video_flow_def(video_flow_id, node_id(), width, height, fps_num, fps_den).c_str(),
+                "", &video_writer, &video_cfg, &created);
+            if (vst != MXL_STATUS_OK) {
+                log("mxlCreateFlowWriter failed (%s)", dmf::mxl_status_str(vst));
+                return;
+            }
+            video_stride = video_cfg.discrete.sliceSizes[0];
+            log("video stride=%u B/line  grain=%u B  ring=%u grains",
+                video_stride, video_stride * static_cast<uint32_t>(height), video_cfg.discrete.grainCount);
+        }
+
+        mxlFlowWriter audio_writer = nullptr;
+        mxlFlowConfigInfo audio_cfg{};
+        int  sample_rate  = video_reader.audio_info.sample_rate;
+        int  channels     = video_reader.audio_info.channels;
+        int  bit_depth    = 32;
+        bool has_audio    = config().contains("audio_flow_id") && video_reader.has_audio;
+
+        int max_audio_samples = 0;
+        if (has_audio) {
+            const auto audio_flow_info = config().at("audio_flow_id");
+            const auto audio_flow_id   = audio_flow_info.at("id").get<std::string>();
+
+            log("audio flow=%s  %d Hz  %dch  %d-bit", audio_flow_id.c_str(), sample_rate, channels, bit_depth);
+
+            bool created = false;
+            mxlStatus ast = mxlCreateFlowWriter(
+                instance(),
+                dmf::make_audio_flow_def(audio_flow_id, node_id(), sample_rate, channels, bit_depth,
+                                         fps_num, fps_den).c_str(),
+                "", &audio_writer, &audio_cfg, &created);
+            if (ast != MXL_STATUS_OK) {
+                log("audio mxlCreateFlowWriter failed (%s) — continuing without audio", dmf::mxl_status_str(ast));
+                has_audio = false;
+            } else {
+                log("audio channels=%u  buffer=%u samples",
+                    audio_cfg.continuous.channelCount, audio_cfg.continuous.bufferLength);
+                size_t max_write = 0;
+                mxlFlowWriterGetMaxWriteLengthSamples(audio_writer, &max_write);
+                max_audio_samples = static_cast<int>(max_write);
+            }
+        }
+        std::vector<uint8_t> audio_temp(max_audio_samples * channels * sizeof(float));
+
+        const mxlRational video_rate = {fps_num, fps_den};
+        const mxlRational audio_rate = {sample_rate, 1};
+        uint64_t audio_index = 0;
+        if (has_audio) {
+            audio_index = mxlGetCurrentIndex(&audio_rate);
+        }
+        uint64_t video_index = has_video ? mxlGetCurrentIndex(&video_rate) : 0;
+
+        while (dmf::g_running.load(std::memory_order_relaxed)) {
+            uint8_t*        video_buf = nullptr;
+            mxlGrainInfo    grain{};
+            mxlStatus       vst = MXL_ERR_UNSUPPORTED_OPERATION;
+            if (has_video) {
+                vst = mxlFlowWriterOpenGrain(video_writer, video_index, &grain, &video_buf);
+            }
+
+            int out_samples_written = 0;
+            dmf::VideoReader::FrameKind frame_kind = video_reader.read_next(
+                has_video ? video_buf : nullptr,
+                video_stride,
+                has_audio ? audio_temp.data() : nullptr,
+                max_audio_samples,
+                out_samples_written
+            );
+
+            if (frame_kind == dmf::VideoReader::FrameKind::None) break;
+
+            if (frame_kind == dmf::VideoReader::FrameKind::Video) {
+                if (has_video && vst == MXL_STATUS_OK) {
+                    grain.flags       = 0;
+                    grain.validSlices = grain.totalSlices;
+                    mxlFlowWriterCommitGrain(video_writer, &grain);
+                }
+                if (has_video) {
+                    const uint64_t ns = mxlGetNsUntilIndex(video_index + 1, &video_rate);
+                    if (ns > 0 && ns < 2'000'000'000ULL) mxlSleepForNs(ns);
+                    video_index = mxlGetCurrentIndex(&video_rate);
+                }
+            } else if (frame_kind == dmf::VideoReader::FrameKind::Audio) {
+                if (has_video && vst == MXL_STATUS_OK) mxlFlowWriterCancelGrain(video_writer);
+                // Wait for audio clock to catch up — prevents TOO_EARLY and sample loss
+                while (dmf::g_running.load(std::memory_order_relaxed)) {
+                    const uint64_t audio_now = mxlGetCurrentIndex(&audio_rate);
+                    if (audio_index + static_cast<uint64_t>(out_samples_written) <= audio_now) break;
+                    const uint64_t ns = mxlGetNsUntilIndex(audio_index + out_samples_written, &audio_rate);
+                    if (ns > 0 && ns < 2'000'000'000ULL) mxlSleepForNs(ns);
+                    else break;
+                }
+                if (!dmf::g_running.load(std::memory_order_relaxed)) break;
+
+                mxlMutableWrappedMultiBufferSlice slice{};
+                mxlStatus ast = mxlFlowWriterOpenSamples(audio_writer, audio_index, out_samples_written, &slice);
+                if (ast != MXL_STATUS_OK) {
+                    log("audio OpenSamples failed (%s) index=%llu — skipping", dmf::mxl_status_str(ast), audio_index);
+                    audio_index += out_samples_written;  // advance even on failure — keeps alignment
+                    continue;
+                }
+                // copy per channel from audio_temp into slice
+                for (int ch = 0; ch < channels; ch++) {
+                    uint8_t* dst0 = static_cast<uint8_t*>(slice.base.fragments[0].pointer)
+                        + ch * slice.stride;
+                    uint8_t* src = audio_temp.data() + ch * max_audio_samples * sizeof(float);
+
+                    size_t frag0_bytes = slice.base.fragments[0].size;
+                    size_t total_bytes = out_samples_written * sizeof(float);
+
+                    if (total_bytes <= frag0_bytes) {
+                        std::memcpy(dst0, src, total_bytes);
+                    } else {
+                        // Wrapped — copy first fragment, then second
+                        std::memcpy(dst0, src, frag0_bytes);
+                        uint8_t* dst1 = static_cast<uint8_t*>(slice.base.fragments[1].pointer)
+                                    + ch * slice.stride;
+                        std::memcpy(dst1, src + frag0_bytes, total_bytes - frag0_bytes);
+                    }
+                }
+                mxlFlowWriterCommitSamples(audio_writer);
+                audio_index += out_samples_written;
+                if (has_video) {
+                    const uint64_t current = mxlGetCurrentIndex(&video_rate);
+                    if (current > video_index) video_index = current;
+                }
+            }
+        }
+
+        log("stopped at video_index=%llu", static_cast<unsigned long long>(video_index));
+        if (has_video) mxlReleaseFlowWriter(instance(), video_writer);
+        if (has_audio) mxlReleaseFlowWriter(instance(), audio_writer);
+    }
+};
+
+int main() {
+    VideoInNode node;
+    return node.execute();
+}

shared/V210.hpp

@@ -170,4 +170,39 @@ inline void UYVYtoV210(uint8_t* src_buf, uint8_t* dst_buf, int width, int height
     }
 }
 
+inline void YUV422P10toV210(const uint16_t* y, const uint16_t* u, const uint16_t* v,
+    uint8_t* dst, int width, int height,
+    int y_stride, int u_stride, int v_stride,  // bytes between rows
+    uint32_t dst_stride)
+    {
+        for (int row = 0; row < height; row++) {
+            const uint16_t* y_row = reinterpret_cast<const uint16_t*>(
+                reinterpret_cast<const uint8_t*>(y) + row * y_stride
+            );
+            const uint16_t* u_row = reinterpret_cast<const uint16_t*>(
+                reinterpret_cast<const uint8_t*>(u) + row * u_stride
+            );
+            const uint16_t* v_row = reinterpret_cast<const uint16_t*>(
+                reinterpret_cast<const uint8_t*>(v) + row * v_stride
+            );
+
+            uint8_t* dst_row = dst + static_cast<ptrdiff_t>(row) * dst_stride;
+            const int blocks = width / 6;
+
+            for (int b = 0; b < blocks; b++) {
+                int x = b * 6;
+                const uint16_t cb0 = u_row[x/2], cb1 = u_row[x/2+1], cb2 = u_row[x/2+2];
+                const uint16_t cr0 = v_row[x/2], cr1 = v_row[x/2+1], cr2 = v_row[x/2+2];
+                const uint16_t y0 = y_row[x], y1 = y_row[x+1], y2 = y_row[x+2];
+                const uint16_t y3 = y_row[x+3], y4 = y_row[x+4], y5 = y_row[x+5];
+
+                auto* w = reinterpret_cast<uint32_t*>(dst_row + b * 16);
+                w[0] = (cb0 & 0x3FFu) | ((y0 & 0x3FFu) << 10) | ((cr0 & 0x3FFu) << 20);
+                w[1] = (y1 & 0x3FFu) | ((cb1 & 0x3FFu) << 10) | ((y2 & 0x3FFu) << 20);
+                w[2] = (cr1 & 0x3FFu) | ((y3 & 0x3FFu) << 10) | ((cb2 & 0x3FFu) << 20);
+                w[3] = (y4 & 0x3FFu) | ((cr2 & 0x3FFu) << 10) | ((y5 & 0x3FFu) << 20);
+            }
+        }
+    }
+
 } // namespace dmf::v210

shared/VideoReader.hpp

@@ -0,0 +1,278 @@
+#pragma once
+
+extern "C" {
+    #include <libavformat/avformat.h>
+    #include <libavcodec/avcodec.h>
+    #include <libavutil/avutil.h>
+    #include <libavutil/imgutils.h>
+    #include <libswscale/swscale.h>
+    #include <libswresample/swresample.h>
+    #include <libavutil/opt.h>
+}
+
+#include <stdexcept>
+#include <string>
+#include <vector>
+#include "Signal.hpp"
+#include "V210.hpp"
+
+namespace dmf {
+
+class VideoReader {
+public:
+    struct VideoInfo {
+        int width   = 0;
+        int height  = 0;
+        int fps_num = 0;
+        int fps_den = 0;
+        AVPixelFormat pix_fmt{};
+    };
+
+    struct AudioInfo {
+        int sample_rate = 0;
+        int channels    = 0;
+    };
+
+    enum class FrameKind { None, Video, Audio };
+
+    VideoInfo video_info{};
+    AudioInfo audio_info{};
+    bool has_audio  = false;
+    bool has_video = false;
+
+    explicit VideoReader(const std::string& filename) {
+        open_file(filename);
+        get_source_info();
+        if (has_video) allocate_video_conversion_buffers();
+        if (has_audio)  allocate_audio_conversion_buffers();
+    }
+
+    ~VideoReader() {
+        avcodec_free_context(&video_codec_context);
+        avcodec_free_context(&audio_codec_context);
+        avformat_close_input(&format_context);
+        sws_freeContext(sws_video_ctx);
+        swr_free(&swr_audio_ctx);
+        av_freep(&p10_data[0]);
+        av_frame_free(&video_frame);
+        av_frame_free(&audio_frame);
+        av_packet_free(&packet);
+    }
+
+    // Returns Video or Audio when a frame/packet was decoded, None when g_running goes false.
+    FrameKind read_next(uint8_t* video_buf, uint32_t mxl_stride, uint8_t* audio_buf, int max_audio_samples, int& out_samples_written) {
+        while (dmf::g_running.load(std::memory_order_relaxed)) {
+            // Drain any frames buffered in the decoder first
+            if (has_video && avcodec_receive_frame(video_codec_context, video_frame) == 0) {
+                if (!video_buf) {
+                    av_frame_unref(video_frame);
+                    continue;  // nowhere to write — discard frame
+                }
+                sws_scale(
+                    sws_video_ctx,
+                    video_frame->data,
+                    video_frame->linesize,
+                    0,
+                    video_info.height,
+                    p10_data,
+                    p10_linesizes
+                );
+                dmf::v210::YUV422P10toV210(
+                    reinterpret_cast<uint16_t*>(p10_data[0]),
+                    reinterpret_cast<uint16_t*>(p10_data[1]),
+                    reinterpret_cast<uint16_t*>(p10_data[2]),
+                    video_buf,
+                    video_info.width,
+                    video_info.height,
+                    p10_linesizes[0],
+                    p10_linesizes[1],
+                    p10_linesizes[2],
+                    mxl_stride
+                );
+                av_frame_unref(video_frame);
+                return FrameKind::Video;
+            }
+
+            if (has_audio && avcodec_receive_frame(audio_codec_context, audio_frame) == 0) {
+                if (!audio_buf) {
+                    av_frame_unref(audio_frame);
+                    continue;  // nowhere to write — discard frame
+                }
+
+                int dst_nb_samples = av_rescale_rnd(
+                    swr_get_delay(swr_audio_ctx, audio_codec_context->sample_rate) + audio_frame->nb_samples,
+                    audio_codec_context->sample_rate, audio_codec_context->sample_rate, AV_ROUND_UP
+                );
+
+                // Guard against buffer overflows
+                if (dst_nb_samples > max_audio_samples) {
+                    dst_nb_samples = max_audio_samples;
+                }
+
+                std::vector<uint8_t*> dst(audio_info.channels);
+                for (int ch = 0; ch < audio_info.channels; ch++) {
+                    dst[ch] = audio_buf + ch * max_audio_samples * sizeof(float);
+                }
+
+                // Convert/Resample the audio layout and sample format
+                int converted_samples = swr_convert(
+                    swr_audio_ctx,
+                    dst.data(), dst_nb_samples,
+                    (const uint8_t**)audio_frame->data, audio_frame->nb_samples
+                );
+                out_samples_written = converted_samples;
+
+                av_frame_unref(audio_frame);
+                return FrameKind::Audio;
+            }
+
+            // No buffered frame — read next packet
+            av_packet_unref(packet);
+            if (av_read_frame(format_context, packet) < 0) {
+                // EOF — loop back to start
+                avformat_seek_file(format_context, -1, 0, 0, 0, AVSEEK_FLAG_BACKWARD);
+                if (has_video) avcodec_flush_buffers(video_codec_context);
+                if (has_audio) {
+                    avcodec_flush_buffers(audio_codec_context);
+                    swr_close(swr_audio_ctx);
+                    swr_init(swr_audio_ctx);
+                }
+                continue;
+            }
+
+            if (packet->stream_index == video_stream_index) {
+                avcodec_send_packet(video_codec_context, packet);
+            } else if (packet->stream_index == audio_stream_index) {
+                avcodec_send_packet(audio_codec_context, packet);
+            }
+        }
+        return FrameKind::None;
+    }
+
+private:
+    int video_stream_index = -1;
+    int audio_stream_index = -1;
+
+    AVFormatContext* format_context        = nullptr;
+    AVPacket*        packet                = av_packet_alloc();
+
+    AVCodecContext*  video_codec_context   = nullptr;
+    AVFrame*         video_frame           = av_frame_alloc();
+    SwsContext* sws_video_ctx         = nullptr;
+    int         p10_linesizes[4] = {0, 0, 0, 0};
+    uint8_t*    p10_data[4]      = {nullptr, nullptr, nullptr, nullptr};
+
+    AVCodecContext* audio_codec_context = nullptr;
+    AVFrame*        audio_frame        = av_frame_alloc();
+    SwrContext* swr_audio_ctx = nullptr;
+
+    void open_file(const std::string& filename) {
+        if (avformat_open_input(&format_context, filename.c_str(), nullptr, nullptr) != 0)
+            throw std::runtime_error("Could not open file: " + filename);
+
+        if (avformat_find_stream_info(format_context, nullptr) < 0) {
+            avformat_close_input(&format_context);
+            throw std::runtime_error("Could not find stream info");
+        }
+
+        for (unsigned int i = 0; i < format_context->nb_streams; ++i) {
+            const AVMediaType type = format_context->streams[i]->codecpar->codec_type;
+            if (type == AVMEDIA_TYPE_VIDEO && video_stream_index == -1) {
+                video_stream_index = static_cast<int>(i);
+                has_video = true;
+            } else if (type == AVMEDIA_TYPE_AUDIO && audio_stream_index == -1) {
+                audio_stream_index = static_cast<int>(i);
+                has_audio = true;
+            }
+        }
+
+        if (!has_video && !has_audio) {
+            avformat_close_input(&format_context);
+            throw std::runtime_error("No audio/video stream found in: " + filename);
+        }
+    }
+
+    void get_source_info() {
+        if (video_stream_index != -1) {
+            AVCodecParameters* video_codec_params = format_context->streams[video_stream_index]->codecpar;
+            const AVCodec* video_codec = avcodec_find_decoder(video_codec_params->codec_id);
+            if (!video_codec)
+                throw std::runtime_error("Unsupported video codec");
+
+            video_codec_context = avcodec_alloc_context3(video_codec);
+            if (avcodec_parameters_to_context(video_codec_context, video_codec_params) < 0)
+                throw std::runtime_error("Could not copy video codec parameters");
+
+            if (avcodec_open2(video_codec_context, video_codec, nullptr) < 0) {
+                avcodec_free_context(&video_codec_context);
+                throw std::runtime_error("Could not open video codec");
+            }
+
+            AVRational fps = video_codec_context->framerate;
+            if (fps.num == 0 || fps.den == 0)
+                fps = format_context->streams[video_stream_index]->avg_frame_rate;
+
+            video_info.width   = video_codec_context->width;
+            video_info.height  = video_codec_context->height;
+            video_info.fps_num = fps.num;
+            video_info.fps_den = fps.den;
+            video_info.pix_fmt = video_codec_context->pix_fmt;
+        } else {
+            has_video = false;
+        }
+
+        // audio part
+        if (audio_stream_index == -1) return;
+        AVCodecParameters* audio_codec_params = format_context->streams[audio_stream_index]->codecpar;
+        const AVCodec* audio_codec = avcodec_find_decoder(audio_codec_params->codec_id);
+        if (!audio_codec)
+            throw std::runtime_error("Unsupported audio codec");
+
+        audio_codec_context = avcodec_alloc_context3(audio_codec);
+        if (avcodec_parameters_to_context(audio_codec_context, audio_codec_params) < 0)
+            throw std::runtime_error("Could not copy audio codec parameters");
+
+        if (avcodec_open2(audio_codec_context, audio_codec, nullptr) < 0) {
+            avcodec_free_context(&audio_codec_context);
+            throw std::runtime_error("Could not open audio codec");
+        }
+        audio_info.sample_rate = audio_codec_context->sample_rate;
+        audio_info.channels = audio_codec_context->ch_layout.nb_channels;
+    }
+
+    void allocate_video_conversion_buffers() {
+        sws_video_ctx = sws_getContext(
+            video_info.width, video_info.height, video_info.pix_fmt,
+            video_info.width, video_info.height, AV_PIX_FMT_YUV422P10LE,
+            SWS_BILINEAR, nullptr, nullptr, nullptr
+        );
+        if (!sws_video_ctx)
+            throw std::runtime_error("Failed to create SwsContext");
+
+        if (av_image_alloc(p10_data, p10_linesizes,
+                video_info.width, video_info.height,
+                AV_PIX_FMT_YUV422P10LE, 64) < 0)
+            throw std::runtime_error("Failed to allocate YUV422P10 buffer");
+    }
+
+    void allocate_audio_conversion_buffers() {
+        swr_audio_ctx = swr_alloc();
+
+        // Set input options
+        av_opt_set_chlayout(swr_audio_ctx, "in_chlayout",    &audio_codec_context->ch_layout, 0);
+        av_opt_set_int(swr_audio_ctx,      "in_sample_rate", audio_info.sample_rate, 0);
+        av_opt_set_sample_fmt(swr_audio_ctx, "in_sample_fmt", audio_codec_context->sample_fmt, 0);
+
+        // Set output options
+        av_opt_set_chlayout(swr_audio_ctx, "out_chlayout",   &audio_codec_context->ch_layout, 0);
+        av_opt_set_int(swr_audio_ctx,      "out_sample_rate", audio_info.sample_rate, 0);
+        av_opt_set_sample_fmt(swr_audio_ctx, "out_sample_fmt", AV_SAMPLE_FMT_FLTP, 0);
+
+        // Initialize the context
+        if (swr_init(swr_audio_ctx) < 0) {
+            throw std::runtime_error("Failed to create SwrContext");
+        }
+    }
+};
+
+} // namespace dmf

studio-manager/FlowGraph.hpp

@@ -17,7 +17,7 @@ struct NodeDef {
 //
 // from_port / to_port are the NODE_CONFIG keys each end receives the flow descriptor under.
 // The injected value is a JSON object: { "id": "<uuid>", ...format fields }.
-// Nodes read the UUID as cfg["flow_id"]["id"] and format fields as cfg["flow_id"]["fps_num"] etc.
+// Nodes read the UUID as cfg["video_flow_id"]["id"] and format fields as cfg["video_flow_id"]["fps_num"] etc.
 //
 // format examples:
 //   video: { "kind":"video", "width":1920, "height":1080, "fps_num":25, "fps_den":1 }

studio-manager/main.cpp

@@ -106,11 +106,11 @@ static dmf::FlowGraph build_graph() {
         {"kind","audio"}, {"sample_rate",48000}, {"channels",2}, {"bit_depth",32}
     };
     g.edges = {
-        // { tp_video_flow,  "testpattern", "flow_id",       "fakesink", "flow_id", video_fmt },
+        // { tp_video_flow,  "testpattern", "video_flow_id",       "fakesink", "video_flow_id", video_fmt },
         // { tp_audio_flow,  "testpattern", "audio_flow_id", "",         "",        audio_fmt },
-        // { ndi_video_flow, "ndiin",       "video_flow_id", "ndiout",   "flow_id", video_fmt },
+        // { ndi_video_flow, "ndiin",       "video_flow_id", "ndiout",   "video_flow_id", video_fmt },
         // { ndi_audio_flow, "ndiin",       "audio_flow_id", "",         "",        audio_fmt },
-        { tp_video_flow,  "testpattern", "flow_id",       "ndiout", "flow_id", video_fmt },
+        { tp_video_flow,  "testpattern", "video_flow_id",       "ndiout", "video_flow_id", video_fmt },
         { tp_audio_flow,  "testpattern", "audio_flow_id", "ndiout", "audio_flow_id", audio_fmt },
     };
     return g;

video-ndi.json

@@ -0,0 +1,18 @@
+{
+  "nodes": [
+    { "id": "videoin", "type": "videoin", "params": {"file": "/home/itten/test-vid/1.ts"} },
+    { "id": "ndiout",  "type": "ndiout",  "params": {} }
+  ],
+  "edges": [
+    {
+      "from": "videoin", "from_port": "video_flow_id",
+      "to":   "ndiout",  "to_port":   "video_flow_id",
+      "format": { "kind": "video", "width": 1920, "height": 1080, "fps_num": 24, "fps_den": 1 }
+    },
+    {
+      "from": "videoin", "from_port": "audio_flow_id",
+      "to":   "ndiout",  "to_port":   "audio_flow_id",
+      "format": { "kind": "audio", "sample_rate": 48000, "channels": 6, "bit_depth": 32 }
+    }
+  ]
+}