/* Настоящее ядро/actor, подписанный медиаблок и H.264 decoder: каталог до подписки, эпоха, показ и teardown. */
#include "../src/streamplayer_window.h"
#include "../src/sound_manager.h"
#include "../transport/stream_bridge.h"
#include <QtTest>
#include <QJsonDocument>
#include <QJsonArray>
#include <QLabel>
#include <QSlider>
#include <atomic>
#include <cmath>
#include <chrono>
#include <deque>

extern "C" {
#include "utun_instance.h"
#include "chat/chat_core.h"
#include "chat/chat_event.h"
#include "stream/stream.h"
#include "stream/stream_member.h"
#include "debug_config.h"
#include "mem.h"
#include "sqlite3.h"
#include "opus_codec.h"
#ifdef HAVE_FFMPEG
#include <libavcodec/avcodec.h>
#endif
}

static QList<QByteArray> snapshots;
#if defined(TEST_NULL_AUDIO) && defined(HAVE_FFMPEG)
static std::atomic<bool> delayedDecoder{false};
static AVCodecContext* delayedContext = nullptr;
static std::deque<AVFrame*> delayedFrames;
static bool delayedDraining = false;
extern "C" int __real_avcodec_open2(AVCodecContext*, const AVCodec*, AVDictionary**);
extern "C" int __wrap_avcodec_open2(AVCodecContext* context, const AVCodec* codec, AVDictionary** options) {
    int result = __real_avcodec_open2(context, codec, options);
    if (!result && delayedDecoder && codec && av_codec_is_decoder(codec)) {
        delayedContext = context; delayedDraining = false;
        DEBUG_INFO(DEBUG_CATEGORY_STREAM, "fixture decoder name=%s holds four real decoded frames before output", codec->name);
    }
    return result;
}
extern "C" int __real_avcodec_receive_frame(AVCodecContext*, AVFrame*);
extern "C" int __wrap_avcodec_receive_frame(AVCodecContext* context, AVFrame* frame) {
    if (context != delayedContext) return __real_avcodec_receive_frame(context, frame);
    int result = __real_avcodec_receive_frame(context, frame);
    if (!result) {
        AVFrame* held = av_frame_clone(frame); if (!held) return AVERROR(ENOMEM);
        delayedFrames.push_back(held); av_frame_unref(frame);
    } else if (result == AVERROR_EOF) delayedDraining = true;
    else if (result != AVERROR(EAGAIN)) return result;
    if ((delayedDraining || delayedFrames.size() >= 4) && !delayedFrames.empty()) {
        AVFrame* held = delayedFrames.front(); delayedFrames.pop_front(); av_frame_move_ref(frame, held); av_frame_free(&held); return 0;
    }
    return delayedDraining ? AVERROR_EOF : AVERROR(EAGAIN);
}
extern "C" void __real_avcodec_free_context(AVCodecContext**);
extern "C" void __wrap_avcodec_free_context(AVCodecContext** context) {
    if (context && *context == delayedContext) {
        for (auto* frame : delayedFrames) av_frame_free(&frame);
        delayedFrames.clear(); delayedContext = nullptr; delayedDraining = false;
    }
    __real_avcodec_free_context(context);
}
#endif
#ifdef TEST_NULL_AUDIO
static std::atomic<ma_device_data_proc> originalAudioCallback{nullptr};
static std::atomic<uint64_t> nonzeroSamples{0};
static std::atomic<uint64_t> silenceGaps{0};
static unsigned silentRun = 0; // Только callback; счётчик промежутков >=1мс между тестовыми тонами.
static std::atomic<uint64_t> leftEnergy{0}, rightEnergy{0};
static std::atomic<int64_t> playbackDelayUs{0};
extern "C" int64_t __real_audio_stream_frame_time(ma_device*, unsigned int, int*);
extern "C" int64_t __wrap_audio_stream_frame_time(ma_device* device, unsigned int frames, int* valid) {
    if (!playbackDelayUs) return __real_audio_stream_frame_time(device, frames, valid);
    *valid = 1;
    return std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::steady_clock::now().time_since_epoch()).count()
        + playbackDelayUs.load();
}
extern "C" ma_result __real_ma_context_init(const ma_backend*, ma_uint32, const ma_context_config*, ma_context*);
extern "C" ma_result __real_ma_device_init(ma_context*, const ma_device_config*, ma_device*);
extern "C" ma_result __wrap_ma_context_init(const ma_backend*, ma_uint32, const ma_context_config*, ma_context* context) {
    ma_backend backend = ma_backend_null; return __real_ma_context_init(&backend, 1, nullptr, context);
}
static void observeAudio(ma_device* device, void* out, const void* in, ma_uint32 frames) {
    originalAudioCallback.load()(device, out, in, frames);
    const auto* pcm = static_cast<const int16_t*>(out);
    uint64_t left = 0, right = 0, nonzero = 0;
    for (unsigned i = 0; i < frames; i++) {
        left += static_cast<int64_t>(pcm[2 * i]) * pcm[2 * i];
        right += static_cast<int64_t>(pcm[2 * i + 1]) * pcm[2 * i + 1];
        nonzero += pcm[2 * i] != 0; nonzero += pcm[2 * i + 1] != 0;
        if (pcm[2 * i] || pcm[2 * i + 1]) silentRun = 0;
        else if (++silentRun == 48) silenceGaps.fetch_add(1);
    }
    leftEnergy.fetch_add(left); rightEnergy.fetch_add(right); nonzeroSamples.fetch_add(nonzero);
}
extern "C" ma_result __wrap_ma_device_init(ma_context* context, const ma_device_config* config, ma_device* device) {
    ma_device_config copy = *config;
    if (copy.deviceType == ma_device_type_playback && copy.playback.format == ma_format_s16 && copy.playback.channels == 2) {
        originalAudioCallback = copy.dataCallback; copy.dataCallback = observeAudio;
    }
    return __real_ma_device_init(context, &copy, device);
}
#endif
static void sourceEvent(UTUN_INSTANCE*, int type, const uint8_t* data, int size) {
    if (type == CHAT_EVT_STREAM_SOURCES) snapshots.push_back(QByteArray(reinterpret_cast<const char*>(data), size));
}

class StreamViewTest : public QObject {
    Q_OBJECT
    UASYNC* ua = nullptr;
    UTUN_INSTANCE* inst = nullptr;
    STREAM_HANDLE* publisher = nullptr;
    uint64_t group = 0, epoch = 0, frameId = 0, mediaPts = 0;
    QTimer poll;
    size_t allocations = 0;
    uint32_t revision = 1;
    uint16_t rotation = 90;

    bool receive(uint64_t id, StreamRecord& record, int64_t position = -1) {
        QElapsedTimer elapsed; elapsed.start();
        while (elapsed.elapsed() < 1000) {
            if (gui_stream_pull(id, record, position)) return true;
            QTest::qWait(1);
        }
        DEBUG_ERROR(DEBUG_CATEGORY_STREAM, "desktop test missing record id=%llu", (unsigned long long)id); return false;
    }

    void publish(const QByteArray& video, const QList<QByteArray>& audio = {}, unsigned videoFrames = 1) {
        stream_media_block media{}; media.format = {160, 90, rotation, STREAM_MEDIA_H264, STREAM_MEDIA_OPUS_STEREO, revision};
        mediaPts += 100000;
        media.first_frame_offset = 0; media.video_count = videoFrames;
        for (unsigned i = 0; i < videoFrames; i++) media.video[i] = {++frameId, mediaPts + i * 100000 / videoFrames,
            static_cast<uint32_t>(video.size()), 0, static_cast<uint32_t>(video.size()), STREAM_MEDIA_KEY,
            reinterpret_cast<const uint8_t*>(video.constData())};
        if (!audio.isEmpty()) {
            media.audio_count = audio.size();
            for (unsigned i = 0; i < media.audio_count; i++) media.audio[i] = {mediaPts + i * 20000,
                static_cast<uint32_t>(audio[i].size()), 960, reinterpret_cast<const uint8_t*>(audio[i].constData())};
        }
        uint8_t wire[7080]; size_t length = 0;
        QCOMPARE(stream_media_encode(&media, wire, sizeof(wire), &length), STREAM_OK);
        QCOMPARE(stream_publish_block(publisher, wire, length), STREAM_OK);
    }

private slots:
    void initTestCase() {
        debug_config_init(); debug_set_level(DEBUG_LEVEL_WARN); debug_set_category_level(DEBUG_CATEGORY_STREAM, DEBUG_LEVEL_INFO);
        if (qEnvironmentVariableIsSet("UTUN_TEST_DEBUG")) {
            debug_set_category_level(DEBUG_CATEGORY_STREAM, DEBUG_LEVEL_TRACE);
            debug_set_category_level(DEBUG_CATEGORY_DEBUG, DEBUG_LEVEL_TRACE);
        }
        debug_set_category_level(DEBUG_CATEGORY_SYS, DEBUG_LEVEL_ERROR);
        allocations = u_get_allocated_count(); ua = uasync_create(); QVERIFY(ua);
        inst = utun_instance_create_from_str(ua,
            "[global]\nauto_sockets=no\n[chatserver]\ngroup_autoconnect=0\nstorage_autoload=0\nmember_files_enabled=0\n");
        QVERIFY(inst); QCOMPARE(utun_core_start(inst), 0); QCOMPARE(chat_service_start(inst), 0);
        chat_core_create_channel_auto(inst, "Stream test");
        sqlite3_stmt* statement = nullptr;
        QCOMPARE(sqlite3_prepare_v2(chat_core_get_db(inst), "SELECT channel_id FROM channels LIMIT 1", -1, &statement, nullptr), SQLITE_OK);
        QCOMPARE(sqlite3_step(statement), SQLITE_ROW);
        group = QString::fromUtf8(reinterpret_cast<const char*>(sqlite3_column_text(statement, 0))).toULongLong();
        sqlite3_finalize(statement); QVERIFY(group);
        chat_event_set_handler(inst, sourceEvent); QVERIFY(gui_stream_watch(group));
        QVERIFY(gui_stream_attach(inst)); uasync_mark_running(ua);
        connect(&poll, &QTimer::timeout, this, [this] { uasync_poll(ua, 0); }); poll.start(1);
    }

    void catalogueWithoutViewer() {
        QTRY_COMPARE(snapshots.size(), 1);
        QCOMPARE(snapshots.last().mid(9), QByteArray("[]")); QVERIFY(!stream_service_needs_activity(inst));
        QCOMPARE(stream_publish_open(inst, group, nullptr, &publisher), STREAM_OK);
        stream_info info{}; QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); epoch = info.descriptor.source_epoch;
        QTRY_COMPARE(snapshots.size(), 2);
        auto sources = QJsonDocument::fromJson(snapshots.last().mid(9)).array(); QCOMPARE(sources.size(), 1);
        QCOMPARE(stream_read_be(reinterpret_cast<const uint8_t*>(snapshots.last().constData()), 8), group);
        QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); QCOMPARE(info.owners, 1u);
    }

    void staleSelectionAndCancellation() {
        QVERIFY(gui_stream_open(100, group, inst->node_id, epoch ^ 1));
        StreamRecord event;
        QVERIFY(receive(100, event)); QCOMPARE(event.kind, StreamRecordKind::Closed);
        QCOMPARE(event.reason, STREAM_CLOSE_SOURCE_CHANGED);
        QVERIFY(gui_stream_open(101, group, inst->node_id, epoch)); gui_stream_stop(101); QTest::qWait(20);
        stream_info info{}; QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); QCOMPARE(info.owners, 1u);
    }

    void mediaAndPressure() {
        QVERIFY(gui_stream_open(102, group, inst->node_id, epoch)); StreamRecord event;
        QVERIFY(receive(102, event)); QCOMPARE(event.kind, StreamRecordKind::Opened);
        const QByteArray frame(1500, 'k'); const QByteArray audio("opus"); publish(frame, {audio});
        QVERIFY(receive(102, event)); QCOMPARE(event.kind, StreamRecordKind::Video); QCOMPARE(event.data, frame);
        QCOMPARE(event.format.rotation, uint16_t(90));
        QVERIFY(receive(102, event)); QCOMPARE(event.kind, StreamRecordKind::Audio); QCOMPARE(event.data, audio);
        for (int i = 0; i < 270; i++) { publish(frame); uasync_poll(ua, 0); }
        unsigned records = 0;
        QElapsedTimer held; held.start();
        while (held.elapsed() < 30) {
            if (gui_stream_pull(102, event, 100000, false, 0)) { QVERIFY(event.kind != StreamRecordKind::Gap); records++; }
            QTest::qWait(1);
        }
        QVERIFY(records <= 2); /* Накопленные 27 секунд остаются в RS, а не в очереди frontend. */
        QVERIFY(receive(102, event, 200000)); QCOMPARE(event.kind, StreamRecordKind::Video);
        QCOMPARE(event.pts, uint64_t(200000)); QCOMPARE(event.data, frame);
        gui_stream_stop(102); QTest::qWait(20);
        stream_info info{}; QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); QCOMPARE(info.owners, 1u);
    }

    void realH264RenderingAndClose() {
#ifdef HAVE_FFMPEG
        /* Фикстура протокола выше содержит фиктивный H264; реальный decoder получает отдельную эпоху. */
        QCOMPARE(stream_publish_finish(publisher), STREAM_OK); stream_close(publisher); publisher = nullptr;
        QCOMPARE(stream_publish_open(inst, group, nullptr, &publisher), STREAM_OK);
        stream_info fresh{}; QCOMPARE(stream_get_info(publisher, &fresh), STREAM_OK); epoch = fresh.descriptor.source_epoch;
        mediaPts = 0; frameId = 0; revision = 1;
        const AVCodec* encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
        if (!encoder) QSKIP("H264 encoder is unavailable for the decoder fixture");
        AVCodecContext* context = avcodec_alloc_context3(encoder); QVERIFY(context);
        context->width = 160; context->height = 90; context->pix_fmt = AV_PIX_FMT_YUV420P;
        context->time_base = {1, 10}; context->framerate = {10, 1}; context->max_b_frames = 0;
        AVDictionary* options = nullptr; av_dict_set(&options, "preset", "ultrafast", 0); av_dict_set(&options, "tune", "zerolatency", 0);
        QCOMPARE(avcodec_open2(context, encoder, &options), 0); av_dict_free(&options);
        AVFrame* frame = av_frame_alloc(); QVERIFY(frame); frame->width = 160; frame->height = 90; frame->format = context->pix_fmt;
        QCOMPARE(av_frame_get_buffer(frame, 32), 0);
        for (int plane = 0; plane < 3; plane++) for (int y = 0; y < (plane ? 45 : 90); y++)
            memset(frame->data[plane] + y * frame->linesize[plane], plane ? 128 : 80, plane ? 80 : 160);
        frame->pts = 0; QCOMPARE(avcodec_send_frame(context, frame), 0);
        AVPacket* packet = av_packet_alloc(); QVERIFY(packet); QCOMPARE(avcodec_receive_packet(context, packet), 0);
        QByteArray video(4, '\0'); video.append(reinterpret_cast<const char*>(packet->data), packet->size);
        av_packet_free(&packet); av_frame_free(&frame); avcodec_free_context(&context);
        std::unique_ptr<opus_codec_encoder_t, decltype(&opus_codec_encoder_destroy)> opus(nullptr, opus_codec_encoder_destroy);
        uint64_t sampleFrame = 0;
#ifdef TEST_NULL_AUDIO
        QVERIFY(SoundManager::instance()->init());
        opus.reset(opus_codec_encoder_create(48000, 2)); QVERIFY(opus);
        QCOMPARE(opus_codec_encoder_application_set(opus.get(), OPUS_CODEC_APP_AUDIO), 0);
        QCOMPARE(opus_codec_encoder_bitrate_set(opus.get(), 128000), 0);
        nonzeroSamples = 0; leftEnergy = rightEnergy = 0; playbackDelayUs = 200000;
#endif
        StreamPlayerWindow window(group, inst->node_id, epoch, "Source");
        QSignalSpy shown(&window, &StreamPlayerWindow::framePresented); window.show();
        auto audioPackets = [&opus, &sampleFrame] {
            QList<QByteArray> packets;
            if (opus) for (unsigned frame = 0; frame < 5; frame++) {
                int16_t pcm[1920]; uint8_t encoded[1275];
                for (unsigned i = 0; i < 960; i++) {
                    pcm[2 * i] = static_cast<int16_t>(6000 * std::sin((sampleFrame + i) * 0.05));
                    pcm[2 * i + 1] = static_cast<int16_t>(1500 * std::sin((sampleFrame + i) * 0.13));
                }
                sampleFrame += 960;
                int length = opus_codec_encode(opus.get(), pcm, 960, encoded, sizeof(encoded));
                if (length <= 0) {
                    DEBUG_ERROR(DEBUG_CATEGORY_STREAM, "desktop startup fixture Opus encode failed result=%d", length);
                    return QList<QByteArray>{};
                }
                packets.append(QByteArray(reinterpret_cast<const char*>(encoded), length));
            }
            return packets;
        };
#ifdef TEST_NULL_AUDIO
        QTest::qWait(20);
        for (unsigned batch = 0; batch < 8; batch++) { publish({}, audioPackets(), 0); uasync_poll(ua, 0); }
        QTest::qWait(200);
        QCOMPARE(shown.count(), 0);
        QCOMPARE(nonzeroSamples.load(), uint64_t(0));
#endif
        QTimer sender;
        connect(&sender, &QTimer::timeout, this, [this, video, &audioPackets] {
            publish(video, audioPackets(), 3);
        });
        sender.start(100);
        QTRY_VERIFY_WITH_TIMEOUT(shown.count() > 0, 5000);
        QTest::qWait(400); // Пройти старт декодера и физическую задержку тестового устройства.
#ifdef TEST_NULL_AUDIO
        uint64_t gapsBefore = silenceGaps.load();
#endif
        int beforeSteady = shown.count(); QTest::qWait(1500);
        QVERIFY2(shown.count() >= beforeSteady + 30, "30fps video must keep advancing with 200ms physical audio latency");
#ifdef TEST_NULL_AUDIO
        QCOMPARE(silenceGaps.load(), gapsBefore);
#endif
        int beforeSwitch = shown.count(); revision++; rotation = 270;
        QTRY_VERIFY_WITH_TIMEOUT(shown.count() > beforeSwitch + 2, 5000);
        stream_info switched{}; QCOMPARE(stream_get_info(publisher, &switched), STREAM_OK);
        QCOMPARE(switched.descriptor.source_epoch, epoch); QCOMPARE(switched.owners, 2u);
#ifdef TEST_NULL_AUDIO
        QTRY_VERIFY_WITH_TIMEOUT(nonzeroSamples.load() > 0, 5000);
        QVERIFY(rightEnergy.load() > 0);
        qInfo("Stereo playback energies: left=%llu right=%llu ratio=%.3f",
              (unsigned long long)leftEnergy.load(), (unsigned long long)rightEnergy.load(),
              static_cast<double>(leftEnergy.load()) / rightEnergy.load());
        QVERIFY2(leftEnergy.load() > rightEnergy.load() * 8 && leftEnergy.load() < rightEnergy.load() * 25,
                 "Independent stereo channels must reach the playback device without downmix");
        auto* volume = window.findChild<QSlider*>(); QVERIFY(volume); volume->setValue(0);
        QTest::qWait(50); uint64_t played = nonzeroSamples.load(); QTest::qWait(100); QCOMPARE(nonzeroSamples.load(), played);
#endif
        sender.stop(); window.close(); QTest::qWait(20);
#ifdef TEST_NULL_AUDIO
        playbackDelayUs = 0;
#endif
        stream_info info{}; QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); QCOMPARE(info.owners, 1u);
#else
        QSKIP("FFmpeg is disabled");
#endif
    }

    void modernCodecPlayback() {
#ifdef HAVE_FFMPEG
        debug_set_category_level(DEBUG_CATEGORY_STREAM, DEBUG_LEVEL_DEBUG);
        struct Fixture { uint8_t type; const char* encoder; };
        const Fixture fixtures[] = {{STREAM_MEDIA_H265, "libx265"}, {STREAM_MEDIA_VP9, "libvpx-vp9"}, {STREAM_MEDIA_AV1, "libaom-av1"}};
        for (const auto& fixture : fixtures) {
            const AVCodec* encoder = avcodec_find_encoder_by_name(fixture.encoder); QVERIFY2(encoder, fixture.encoder);
            AVCodecContext* context = avcodec_alloc_context3(encoder); QVERIFY(context);
            context->width = 160; context->height = 90; context->pix_fmt = AV_PIX_FMT_YUV420P; context->bit_rate = 200000;
            context->time_base = {1, 30}; context->framerate = {30, 1}; context->max_b_frames = 0; context->thread_count = 1; context->gop_size = 1;
            context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
            AVDictionary* options = nullptr;
            if (fixture.type == STREAM_MEDIA_H265) {
                av_dict_set(&options, "preset", "ultrafast", 0); av_dict_set(&options, "tune", "zerolatency", 0);
                av_dict_set(&options, "x265-params", "pools=none:frame-threads=1:log-level=error:bframes=0:repeat-headers=1", 0);
            } else {
                av_dict_set(&options, "lag-in-frames", "0", 0); av_dict_set(&options, "cpu-used", "8", 0);
                av_dict_set(&options, fixture.type == STREAM_MEDIA_VP9 ? "deadline" : "usage", "realtime", 0);
            }
            QCOMPARE(avcodec_open2(context, encoder, &options), 0); av_dict_free(&options);
            AVFrame* frame = av_frame_alloc(); QVERIFY(frame); frame->width = 160; frame->height = 90; frame->format = context->pix_fmt;
            QCOMPARE(av_frame_get_buffer(frame, 32), 0);
            for (int plane = 0; plane < 3; plane++) for (int y = 0; y < (plane ? 45 : 90); y++)
                memset(frame->data[plane] + y * frame->linesize[plane], plane ? 128 : 80, plane ? 80 : 160);
            frame->pts = 0; QCOMPARE(avcodec_send_frame(context, frame), 0);
            AVPacket* packet = av_packet_alloc(); QVERIFY(packet);
            int received = avcodec_receive_packet(context, packet);
            if (received == AVERROR(EAGAIN)) { QCOMPARE(avcodec_send_frame(context, nullptr), 0); received = avcodec_receive_packet(context, packet); }
            QCOMPARE(received, 0); QVERIFY(packet->flags & AV_PKT_FLAG_KEY);
            QByteArray video(4, '\0');
            stream_write_be(reinterpret_cast<uint8_t*>(video.data()), context->extradata_size, 4);
            if (context->extradata_size) video.append(reinterpret_cast<const char*>(context->extradata), context->extradata_size);
            video.append(reinterpret_cast<const char*>(packet->data), packet->size);
            av_packet_free(&packet); av_frame_free(&frame); avcodec_free_context(&context);
            QCOMPARE(stream_publish_finish(publisher), STREAM_OK); stream_close(publisher); publisher = nullptr;
            QCOMPARE(stream_publish_open(inst, group, nullptr, &publisher), STREAM_OK);
            stream_info info{}; QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); epoch = info.descriptor.source_epoch;
            StreamPlayerWindow window(group, inst->node_id, epoch, fixture.encoder); QSignalSpy shown(&window, &StreamPlayerWindow::framePresented);
            window.show();
            stream_media_block media{}; media.format = {160, 90, 0, fixture.type, 0, 1}; media.video_count = 1;
            media.video[0] = {1, 0, (uint32_t)video.size(), 0, (uint32_t)video.size(), STREAM_MEDIA_KEY,
                reinterpret_cast<const uint8_t*>(video.constData())};
            uint8_t wire[7345]; size_t length = 0;
            QCOMPARE(stream_media_encode(&media, wire, sizeof(wire), &length), STREAM_OK);
            QCOMPARE(stream_publish_block(publisher, wire, length), STREAM_OK);
            QTRY_VERIFY_WITH_TIMEOUT(shown.count() > 0, 2000);
            QCOMPARE(stream_publish_finish(publisher), STREAM_OK);
            QTRY_VERIFY_WITH_TIMEOUT(stream_get_info(publisher, &info) == STREAM_OK && info.owners == 1, 2000);
            window.close(); QTest::qWait(20);
        }
        debug_set_category_level(DEBUG_CATEGORY_STREAM, DEBUG_LEVEL_INFO);
#endif
    }

    void delayedDecoderAndShortStreamDrain() {
#if defined(TEST_NULL_AUDIO) && defined(HAVE_FFMPEG)
        const AVCodec* encoder = avcodec_find_encoder_by_name("libx264"); QVERIFY(encoder);
        AVCodecContext* context = avcodec_alloc_context3(encoder); QVERIFY(context);
        context->width = 160; context->height = 90; context->pix_fmt = AV_PIX_FMT_YUV420P;
        context->time_base = {1, 25}; context->max_b_frames = 0;
        AVDictionary* options = nullptr; av_dict_set(&options, "preset", "ultrafast", 0); av_dict_set(&options, "tune", "zerolatency", 0);
        QCOMPARE(avcodec_open2(context, encoder, &options), 0); av_dict_free(&options);
        AVFrame* frame = av_frame_alloc(); QVERIFY(frame); frame->width = 160; frame->height = 90; frame->format = context->pix_fmt;
        QCOMPARE(av_frame_get_buffer(frame, 32), 0);
        for (int plane = 0; plane < 3; plane++) for (int y = 0; y < (plane ? 45 : 90); y++)
            memset(frame->data[plane] + y * frame->linesize[plane], plane ? 128 : 80, plane ? 80 : 160);
        frame->pts = 0; QCOMPARE(avcodec_send_frame(context, frame), 0);
        AVPacket* packet = av_packet_alloc(); QVERIFY(packet); QCOMPARE(avcodec_receive_packet(context, packet), 0);
        QByteArray access(reinterpret_cast<const char*>(packet->data), packet->size);
        av_packet_free(&packet); av_frame_free(&frame); avcodec_free_context(&context);
        struct Delay { Delay() { delayedDecoder = true; } ~Delay() { delayedDecoder = false; } } delay;
        for (unsigned count : {3u, 8u}) {
            QCOMPARE(stream_publish_finish(publisher), STREAM_OK); stream_close(publisher); publisher = nullptr;
            QCOMPARE(stream_publish_open(inst, group, nullptr, &publisher), STREAM_OK);
            stream_info info{}; QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); epoch = info.descriptor.source_epoch;
            StreamPlayerWindow window(group, inst->node_id, epoch, "Delayed decoder"); window.show();
            QSignalSpy shown(&window, &StreamPlayerWindow::framePresented);
            for (unsigned i = 0; i < count; i++) {
                QByteArray data = i ? access : QByteArray(4, '\0') + access;
                stream_media_block media{}; media.format = {160, 90, 0, STREAM_MEDIA_H264, 0, 1}; media.video_count = 1;
                media.video[0] = {i + 1, i * 40000u, (uint32_t)data.size(), 0, (uint32_t)data.size(),
                    (uint8_t)(i ? 0 : STREAM_MEDIA_KEY), reinterpret_cast<const uint8_t*>(data.constData())};
                uint8_t wire[7345]; size_t length = 0;
                QCOMPARE(stream_media_encode(&media, wire, sizeof(wire), &length), STREAM_OK);
                QCOMPARE(stream_publish_block(publisher, wire, length), STREAM_OK); QTest::qWait(i ? 1 : 30);
            }
            QTest::qWait(100);
            if (count == 3) QCOMPARE(shown.count(), 0);
            else QTRY_VERIFY_WITH_TIMEOUT(shown.count() > 0, 1500);
            QCOMPARE(stream_publish_finish(publisher), STREAM_OK);
            QTRY_COMPARE_WITH_TIMEOUT(shown.count(), (int)count, 2000);
            QTRY_VERIFY_WITH_TIMEOUT(stream_get_info(publisher, &info) == STREAM_OK && info.owners == 1, 2000);
            window.close(); QTest::qWait(10);
        }
#else
        QSKIP("Delayed FFmpeg decoder fixture requires Linux and FFmpeg");
#endif
    }

    void finishAndDetachPendingOwner() {
        QCOMPARE(stream_publish_finish(publisher), STREAM_OK); QTRY_COMPARE(snapshots.last().mid(9), QByteArray("[]"));
        stream_close(publisher); publisher = nullptr;
        QCOMPARE(stream_publish_open(inst, group, nullptr, &publisher), STREAM_OK);
        stream_info info{}; QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); QVERIFY(info.descriptor.source_epoch != epoch);
        QVERIFY(gui_stream_open(103, group, inst->node_id, epoch)); StreamRecord event;
        QVERIFY(receive(103, event)); QCOMPARE(event.reason, STREAM_CLOSE_SOURCE_CHANGED);
        QVERIFY(gui_stream_open(104, group, inst->node_id, info.descriptor.source_epoch));
        gui_stream_detach(inst); QVERIFY(!gui_stream_ready()); QTest::qWait(20);
        QCOMPARE(stream_get_info(publisher, &info), STREAM_OK); QCOMPARE(info.owners, 1u);
    }

    void channelClosureNotifiesViewer() {
        QVERIFY(gui_stream_attach(inst)); QVERIFY(gui_stream_watch(group));
        stream_info info{}; QCOMPARE(stream_get_info(publisher, &info), STREAM_OK);
        QVERIFY(gui_stream_open(105, group, inst->node_id, info.descriptor.source_epoch));
        StreamRecord event; QVERIFY(receive(105, event)); QCOMPARE(event.kind, StreamRecordKind::Opened);
        QByteArray channel = QByteArray::number(group); chat_core_delete_channel(inst, channel.constData());
        QVERIFY(receive(105, event)); QCOMPARE(event.kind, StreamRecordKind::Closed); QCOMPARE(event.reason, STREAM_CLOSE_GROUP);
        QTRY_COMPARE(snapshots.last().mid(9), QByteArray("[]"));
        QVERIFY(!stream_handle_active(publisher)); QCOMPARE(stream_handle_reason(publisher), STREAM_CLOSE_GROUP);
    }

    void cleanupTestCase() {
        poll.stop(); gui_stream_detach(inst); stream_close(publisher); uasync_mark_stopped(ua);
        SoundManager::instance()->shutdown();
        utun_instance_destroy(inst); uasync_destroy(ua, 0);
        QCOMPARE(u_get_allocated_count(), allocations);
    }
};
QTEST_MAIN(StreamViewTest)
#include "test_stream_view.moc"