From a12665bbd158fb33bd3afd5d39d95402c66179b7 Mon Sep 17 00:00:00 2001
From: evgeny <evgeny@adaptto.ru>
Date: Tue, 13 Oct 2026 23:30:06 +0200
Subject: [PATCH] Drive desktop ring playback from corrected history and
 physical audio time

---
 tools/chatgui/src/streamplayer_window.cpp | 299 +++++++++++-----------
 1 file changed, 147 insertions(+), 152 deletions(-)

diff --git a/tools/chatgui/src/streamplayer_window.cpp b/tools/chatgui/src/streamplayer_window.cpp
index 769ab689..4fff1d50 100644
--- a/tools/chatgui/src/streamplayer_window.cpp
+++ b/tools/chatgui/src/streamplayer_window.cpp
@@ -14,15 +14,15 @@
 #include <thread>
 #include <mutex>
 #include <deque>
-#include <array>
 #include <chrono>
 #include <algorithm>
 #include <cstring>
 
 extern "C" {
 #include "../../../lib/debug_config.h"
-#include "../../../lib/opus_codec.h"
 #include "../../../src/stream/stream.h"
+#include "../../../src/stream/stream_playback_clock.h"
+#include "../../../src/stream/stream_playback_audio.h"
 #ifdef HAVE_FFMPEG
 #include <libavcodec/avcodec.h>
 #include <libswscale/swscale.h>
@@ -39,7 +39,6 @@ QString text(const char* value) { return QCoreApplication::translate("ChatGui",
 
 struct StreamPlayerWindow::Playback {
     struct Video { QImage image; int64_t pts; };
-    struct Audio { std::array<int16_t, 1920> pcm; int64_t pts; unsigned offset = 0; };
     uint64_t id = ++nextId, group = 0, source = 0, epoch = 0;
     std::atomic<bool> running{true}, audioAvailable{false};
     std::atomic<float> volume{1.0f};
@@ -47,14 +46,27 @@ struct StreamPlayerWindow::Playback {
     std::mutex lock;
     std::deque<Video> videos;
     size_t videoBytes = 0;
-    std::deque<Audio> audios;
-    int64_t prefillUntil = 0, videoBase = -1, videoAt = 0, audioPts = -1, audioAt = 0;
-    uint64_t shown = 0, underruns = 0;
-    bool ended = false;
+    stream_playback_audio* sound = nullptr;
+    stream_playback_clock adaptation{};
+    stream_playback_state timing{};
+    stream_media_status media{};
+    int64_t position = -1, clockAt = 0, ready = -1, audioDacAt = 0, deviceLead = 0, lastShownPts = -1;
+    uint64_t audioFrameStart = 0, shown = 0, underruns = 0, endFrames = UINT64_MAX;
+    bool started = false, ended = false, activeAudio = false, holdAudio = false, resync = false;
+    ~Playback() { stream_playback_audio_destroy(sound); }
 
-    int64_t clock(int64_t now) const {
-        if (audioAvailable && audioPts >= 0 && now - audioAt < 200000) return audioPts + now - audioAt;
-        return videoBase >= 0 ? videoBase + now - videoAt : 0;
+    uint64_t played(int64_t now) const {
+        if (!sound || !audioDacAt) return 0;
+        long double frames = (long double)audioFrameStart + (long double)(now - audioDacAt) * 48000 / 1000000;
+        uint64_t count = frames <= 0 ? 0 : (uint64_t)frames;
+        return std::min(count, stream_playback_audio_written(sound));
+    }
+    int64_t clock(int64_t now) {
+        if (!started) return 0;
+        if (activeAudio && sound && audioAvailable)
+            return std::max(position, stream_playback_audio_position(sound, played(now)));
+        int64_t proposed = position + (now - clockAt) * adaptation.tempo_milli / 1000;
+        return std::max(position, std::min(ready, proposed));
     }
 };
 
@@ -62,8 +74,7 @@ StreamPlayerWindow::StreamPlayerWindow(uint64_t group, uint64_t source, uint64_t
     : QWidget(parent), m_playback(std::make_unique<Playback>()) {
     m_playback->group = group; m_playback->source = source; m_playback->epoch = epoch;
     setWindowTitle(text("Live stream: %1").arg(name)); resize(800, 500);
-    auto* layout = new QVBoxLayout(this);
-    layout->addWidget(new QLabel(name, this));
+    auto* layout = new QVBoxLayout(this); layout->addWidget(new QLabel(name, this));
     m_status = new QLabel(text("Connecting…"), this); layout->addWidget(m_status);
     m_render = new VideoRenderWidget(this); layout->addWidget(m_render, 1);
     auto* controls = new QHBoxLayout;
@@ -77,12 +88,14 @@ StreamPlayerWindow::StreamPlayerWindow(uint64_t group, uint64_t source, uint64_t
     connect(this, &StreamPlayerWindow::statusChanged, m_status, &QLabel::setText, Qt::QueuedConnection);
     connect(SoundManager::instance(), &SoundManager::contextAboutToReset, this, [this] {
         m_audio.close(); m_playback->audioAvailable = false;
-        std::lock_guard<std::mutex> guard(m_playback->lock);
-        m_playback->audios.clear(); m_playback->audioPts = -1;
-        DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop stream audio context reset id=%llu", (unsigned long long)m_playback->id);
+        std::lock_guard<std::mutex> guard(m_playback->lock); m_playback->resync = true;
     });
     connect(SoundManager::instance(), &SoundManager::contextRestored, this, &StreamPlayerWindow::openAudio);
-    connect(SoundManager::instance(), &SoundManager::devicesChanged, this, [this] { m_audio.close(); openAudio(); });
+    connect(SoundManager::instance(), &SoundManager::devicesChanged, this, [this] {
+        m_audio.close(); m_playback->audioAvailable = false;
+        { std::lock_guard<std::mutex> guard(m_playback->lock); m_playback->resync = true; }
+        openAudio();
+    });
     openAudio();
     connect(&m_timer, &QTimer::timeout, this, &StreamPlayerWindow::tick); m_timer.start(15);
     m_playback->worker = std::thread(&StreamPlayerWindow::decode, this);
@@ -90,7 +103,7 @@ StreamPlayerWindow::StreamPlayerWindow(uint64_t group, uint64_t source, uint64_t
 
 StreamPlayerWindow::~StreamPlayerWindow() { stop(); }
 
-/* Output принадлежит GUI и закрывается до shutdown общего miniaudio-контекста. */
+/* Hardware callback заполняет только ближайшую порцию; source time тишины остаётся неподвижным. */
 void StreamPlayerWindow::openAudio() {
     if (!m_playback->running || m_audio.initialized()) return;
     ma_context* context = SoundManager::instance()->context();
@@ -103,63 +116,62 @@ void StreamPlayerWindow::openAudio() {
         auto* pcm = static_cast<int16_t*>(output); std::fill(pcm, pcm + frames * 2, 0);
         auto& p = *m_playback; std::lock_guard<std::mutex> guard(p.lock);
         int64_t now = nowUs();
-        if (!p.prefillUntil || now < p.prefillUntil) return;
-        unsigned written = 0; float volume = p.volume.load(); int64_t firstPts = -1;
-        while (written < frames && !p.audios.empty()) {
-            auto& packet = p.audios.front();
-            if (firstPts < 0) firstPts = packet.pts + packet.offset * 1000000LL / 48000 - written * 1000000LL / 48000;
-            unsigned count = std::min(frames - written, 960 - packet.offset);
-            for (unsigned i = 0; i < count * 2; i++) pcm[written * 2 + i] = static_cast<int16_t>(packet.pcm[packet.offset * 2 + i] * volume);
-            written += count; packet.offset += count;
-            if (packet.offset == 960) p.audios.pop_front();
-        }
-        if (firstPts >= 0) { p.audioPts = firstPts; p.audioAt = m_audio.callbackTimeUs(); }
-        else if (p.audioPts >= 0) {
-            p.audioPts += m_audio.callbackTimeUs() - p.audioAt; p.audioAt = m_audio.callbackTimeUs();
+        p.deviceLead = std::max<int64_t>(0, m_audio.callbackTimeUs() - now);
+        if (!p.sound || !p.started || p.resync) return;
+        p.audioFrameStart = stream_playback_audio_written(p.sound); p.audioDacAt = m_audio.callbackTimeUs();
+        int count = p.holdAudio ? 0 : stream_playback_audio_pull(p.sound, pcm, frames, p.ended ? INT64_MAX : p.ready);
+        if (count < 0) { p.resync = true; count = 0; }
+        if ((unsigned)count < frames) {
+            stream_playback_audio_silence(p.sound, frames - (unsigned)count);
+            if (!p.ended) p.underruns++;
         }
-        if (written < frames && p.audioPts >= 0 && !p.ended) p.underruns++;
+        float volume = p.volume.load();
+        for (int i = 0; i < count * 2; i++) pcm[i] = static_cast<int16_t>(pcm[i] * volume);
+        if (p.ended && p.endFrames == UINT64_MAX && stream_playback_audio_empty(p.sound))
+            p.endFrames = stream_playback_audio_written(p.sound);
     });
     if (!initialized || !m_audio.start()) {
         DEBUG_ERROR(DEBUG_CATEGORY_STREAM, "desktop stream audio device failed id=%llu", (unsigned long long)m_playback->id);
         m_audio.close(); m_playback->audioAvailable = false; return;
     }
     m_playback->audioAvailable = true;
-    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop stream audio output ready id=%llu rate=48000 channels=2", (unsigned long long)m_playback->id);
 }
 
-/* GUI забирает последний готовый кадр по аппаратным часам, не накапливая Qt-сигналы с QImage. */
+/* GUI держит только ближайшие готовые изображения; накопленный поток остаётся в RS-кольце. */
 void StreamPlayerWindow::tick() {
     auto& p = *m_playback;
-    if (m_audio.needsRecovery()) { m_audio.close(); p.audioAvailable = false; openAudio(); }
+    if (m_audio.needsRecovery()) {
+        m_audio.close(); p.audioAvailable = false;
+        { std::lock_guard<std::mutex> guard(p.lock); p.resync = true; }
+        openAudio();
+    }
     QImage image; bool finished = false, first = false;
     {
         std::lock_guard<std::mutex> guard(p.lock);
-        int64_t now = nowUs(), clock = p.clock(now);
-        if (now >= p.prefillUntil) while (!p.videos.empty() && p.videos.front().pts <= clock) {
+        int64_t clock = p.clock(nowUs());
+        while (p.started && !p.videos.empty() && p.videos.front().pts <= clock) {
             p.videoBytes -= static_cast<size_t>(p.videos.front().image.sizeInBytes());
-            image = std::move(p.videos.front().image); p.videos.pop_front();
+            p.lastShownPts = p.videos.front().pts; image = std::move(p.videos.front().image); p.videos.pop_front();
         }
         if (!image.isNull()) first = p.shown++ == 0;
-        finished = p.ended && p.videos.empty() && (p.audios.empty() || !p.audioAvailable);
+        bool audioDone = !p.activeAudio || !p.audioAvailable || (p.endFrames != UINT64_MAX && p.played(nowUs()) >= p.endFrames);
+        finished = p.ended && p.videos.empty() && audioDone;
     }
     if (!image.isNull()) {
-        m_render->setFrame(image);
-        m_status->setText(text("Live"));
-        if (first) {
-            DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop first frame id=%llu %dx%d", (unsigned long long)p.id, image.width(), image.height());
-        }
+        m_render->setFrame(image); m_status->setText(text("Live"));
+        if (first) DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop first frame id=%llu %dx%d", (unsigned long long)p.id,
+                              image.width(), image.height());
         emit framePresented();
     }
     if (finished) { m_status->setText(text("Stream ended")); m_audio.close(); m_timer.stop(); }
 }
 
-/* Закрытие может происходить до выполнения open actor; session_id отменяет именно эту попытку. */
+/* Callback устройства прекращается до освобождения DSP; worker снимает только свой reader. */
 void StreamPlayerWindow::stop() {
     if (!m_playback->running.exchange(false) && !m_playback->worker.joinable()) return;
-    m_timer.stop(); gui_stream_stop(m_playback->id);
+    m_timer.stop(); gui_stream_stop(m_playback->id); m_audio.close(); m_playback->audioAvailable = false;
     if (m_playback->worker.joinable()) m_playback->worker.join();
-    m_audio.close(); m_playback->audioAvailable = false;
-    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop stream player stopped id=%llu shown=%llu underruns=%llu",
+    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop player stopped id=%llu shown=%llu underruns=%llu",
                (unsigned long long)m_playback->id, (unsigned long long)m_playback->shown, (unsigned long long)m_playback->underruns);
 }
 
@@ -169,7 +181,7 @@ void StreamPlayerWindow::keyPressEvent(QKeyEvent* event) {
     else QWidget::keyPressEvent(event);
 }
 
-/* Worker владеет codec contexts. GAP/pressure сбрасывает refs и часы до следующего ключевого кадра. */
+/* Worker декодирует по запросу ближайшего времени; общая минутная адаптация не зависит от сетевого cursor. */
 void StreamPlayerWindow::decode() {
     auto& p = *m_playback;
 #ifndef HAVE_FFMPEG
@@ -178,34 +190,77 @@ void StreamPlayerWindow::decode() {
 #else
     AVCodecContext* decoder = nullptr; AVFrame* frame = av_frame_alloc(); AVPacket* packet = av_packet_alloc();
     SwsContext* converter = nullptr;
-    opus_codec_decoder_t* opus = nullptr;
     bool waitKey = true, opened = false;
-    int64_t deadline = nowUs() + 10000000, reportAt = nowUs(), expectedAudio = -1;
-    uint64_t decoded = 0, discarded = 0, late = 0, pressureDropped = 0, previousPressure = 0, previousDecoded = 0, previousShown = 0;
-    uint64_t prerollSamples = 0;
-    uint32_t videoRevision = 0;
-    auto reset = [&] {
-        avcodec_free_context(&decoder);
-        opus_codec_decoder_destroy(opus); opus = nullptr; expectedAudio = -1; waitKey = true; prerollSamples = 0;
-        std::lock_guard<std::mutex> guard(p.lock);
-        p.videos.clear(); p.videoBytes = 0; p.audios.clear(); p.prefillUntil = 0; p.videoBase = p.audioPts = -1;
-        emit statusChanged(text("Waiting for a key frame…"));
+    uint32_t revision = 0;
+    uint64_t decoded = 0, discarded = 0, reportedShown = 0;
+    int64_t deadline = nowUs() + 10000000, report = nowUs();
+    auto reset = [&](bool request) {
+        avcodec_free_context(&decoder); waitKey = true;
+        {
+            std::lock_guard<std::mutex> guard(p.lock);
+            stream_playback_audio_destroy(p.sound); p.sound = nullptr;
+            p.videos.clear(); p.videoBytes = 0; p.started = false; p.position = p.ready = -1;
+            p.audioDacAt = 0; p.audioFrameStart = 0; p.holdAudio = p.resync = false; p.endFrames = UINT64_MAX;
+        }
+        if (request && !gui_stream_resync(p.id)) DEBUG_WARN(DEBUG_CATEGORY_STREAM, "desktop playback resync refused");
+        deadline = nowUs() + 10000000; emit statusChanged(text("Waiting for a key frame…"));
     };
     auto fail = [&](const QString& reason) {
         DEBUG_ERROR(DEBUG_CATEGORY_STREAM, "desktop viewer failed id=%llu: %s", (unsigned long long)p.id, qPrintable(reason));
         emit statusChanged(reason);
     };
+    auto observe = [&] {
+        stream_media_status status{};
+        if (!gui_stream_status(p.id, status)) return;
+        std::lock_guard<std::mutex> guard(p.lock);
+        p.media = status;
+        if (!status.initialized) return;
+        if (!p.started) {
+            p.activeAudio = status.audio_enabled && p.audioAvailable;
+            if (p.activeAudio) p.sound = stream_playback_audio_create(status.start_us);
+            if (p.activeAudio && !p.sound) { p.running = false; return; }
+            p.position = status.start_us; p.clockAt = nowUs(); p.started = true;
+            stream_playback_clock_reset(&p.adaptation, p.id);
+            DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop playback starts id=%llu pts=%lld fixed_prefill=0",
+                       (unsigned long long)p.id, (long long)p.position);
+        }
+        p.ready = p.activeAudio ? status.ready_us : status.video_us;
+    };
     if (!frame || !packet) fail(text("Stream decoder allocation failed"));
     else if (!gui_stream_open(p.id, p.group, p.source, p.epoch)) fail(text("Could not connect to the stream"));
     else while (p.running) {
+        bool resync;
+        { std::lock_guard<std::mutex> guard(p.lock); resync = p.resync; }
+        if (resync) reset(true);
+        observe();
+        int64_t position, videoAhead, audioAhead;
+        {
+            std::lock_guard<std::mutex> guard(p.lock);
+            int64_t now = nowUs(); position = p.started ? p.clock(now) : -1;
+            videoAhead = p.videos.size() < 2 ? 80000 : -1;
+            audioAhead = !p.activeAudio || !p.sound || stream_playback_audio_needs_input(p.sound) ? p.deviceLead + 80000 : -1;
+            if (p.started && p.ready >= 0) {
+                uint64_t played = p.played(now);
+                p.holdAudio = !p.videos.empty() && p.videos.front().pts < position - 40000;
+                int starved = p.holdAudio || (p.sound && stream_playback_audio_starved(p.sound, played));
+                int64_t guardUs = std::max<int64_t>(33333, p.activeAudio ? p.deviceLead + 10000 : 33333);
+                int64_t pending = p.sound ? stream_playback_audio_pending_gain(p.sound, played) : 0;
+                if (stream_playback_clock_update(&p.adaptation, now, std::max(p.position, position), p.ready,
+                                                 guardUs, pending, !p.ended && starved, &p.timing) < 0) p.resync = true;
+                else {
+                    p.position = std::max(p.position, position); p.clockAt = now;
+                    if (p.sound) stream_playback_audio_set_tempo(p.sound, p.timing.tempo_milli);
+                }
+            }
+        }
         StreamRecord record;
-        if (!gui_stream_pull(p.id, record)) {
+        if (!gui_stream_pull(p.id, record, position, videoAhead, audioAhead)) {
             if (!gui_stream_ready()) { fail(text("Chat service is stopped")); break; }
             if ((!opened || waitKey) && nowUs() > deadline) { fail(text("Stream connection timed out")); break; }
             std::this_thread::sleep_for(std::chrono::milliseconds(5)); continue;
         }
         if (record.kind == StreamRecordKind::Opened) { opened = true; continue; }
-        if (record.kind == StreamRecordKind::Gap) { reset(); deadline = nowUs() + 10000000; continue; }
+        if (record.kind == StreamRecordKind::Gap) { reset(false); continue; }
         if (record.kind == StreamRecordKind::Closed) {
             const char* reason = record.reason == STREAM_CLOSE_SOURCE_CHANGED ? "The stream restarted. Select a source again."
                 : record.reason == STREAM_CLOSE_MEMBER ? "The source is no longer a channel member"
@@ -215,45 +270,22 @@ void StreamPlayerWindow::decode() {
         }
         if (record.kind == StreamRecordKind::End) {
             std::lock_guard<std::mutex> guard(p.lock); p.ended = true;
-            if (p.videoBase < 0) p.audios.clear();
+            if (p.sound) stream_playback_audio_finish(p.sound);
             break;
         }
+        observe();
         if (record.pts > INT64_MAX) { fail(text("Invalid stream timestamp")); break; }
         if (record.kind == StreamRecordKind::Audio) {
-            if (!p.audioAvailable) continue;
-            if (!opus) opus = opus_codec_decoder_create(48000, 2);
-            if (!opus) { fail(text("Stream audio decoder failed")); break; }
-            if (expectedAudio >= 0 && (static_cast<int64_t>(record.pts) < expectedAudio - 10000
-                || static_cast<int64_t>(record.pts) > expectedAudio + 100000)) {
-                DEBUG_WARN(DEBUG_CATEGORY_STREAM, "desktop audio discontinuity id=%llu expected=%lld pts=%llu",
-                           (unsigned long long)p.id, (long long)expectedAudio, (unsigned long long)record.pts);
-                reset(); deadline = nowUs() + 10000000; continue;
-            }
-            int missing = expectedAudio < 0 ? 0 : static_cast<int>((static_cast<int64_t>(record.pts) - expectedAudio + 10000) / 20000);
-            bool failed = false, pressure = false;
-            for (int i = 0; i <= missing; i++) {
-                Playback::Audio audio{}; audio.pts = i == missing ? static_cast<int64_t>(record.pts) : expectedAudio + i * 20000;
-                int count = opus_codec_decode(opus, i == missing ? reinterpret_cast<const uint8_t*>(record.data.constData()) : nullptr,
-                                             i == missing ? record.data.size() : 0, audio.pcm.data(), 960);
-                if (count != 960) { fail(text("Stream audio decoder failed")); failed = true; break; }
-                std::lock_guard<std::mutex> guard(p.lock);
-                if (p.audios.size() >= 25) {
-                    if (p.videoBase >= 0) { pressure = true; break; }
-                    prerollSamples += 960; p.audios.pop_front();
-                }
-                p.audios.push_back(std::move(audio));
-            }
-            if (failed) break;
-            if (pressure) {
-                DEBUG_WARN(DEBUG_CATEGORY_STREAM, "desktop decoded audio pressure id=%llu; wait KEY", (unsigned long long)p.id);
-                reset(); deadline = nowUs() + 10000000;
-            } else expectedAudio = static_cast<int64_t>(record.pts) + 20000;
+            int result = 0;
+            { std::lock_guard<std::mutex> guard(p.lock);
+              if (p.sound) result = stream_playback_audio_feed(p.sound, (int64_t)record.pts,
+                  reinterpret_cast<const uint8_t*>(record.data.constData()), (size_t)record.data.size()); }
+            if (result == -2) reset(true);
+            else if (result < 0) { fail(text("Stream audio decoder failed")); break; }
             continue;
         }
-        if (videoRevision != record.format.revision) {
-            DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop video revision=%u->%u dimensions=%ux%u rotation=%u; preserve audio",
-                       videoRevision, record.format.revision, record.format.width, record.format.height, record.format.rotation);
-            avcodec_free_context(&decoder); av_frame_unref(frame); waitKey = true; videoRevision = record.format.revision;
+        if (revision != record.format.revision) {
+            avcodec_free_context(&decoder); waitKey = true; revision = record.format.revision;
             { std::lock_guard<std::mutex> guard(p.lock); p.videos.clear(); p.videoBytes = 0; }
             deadline = nowUs() + 10000000;
         }
@@ -263,87 +295,50 @@ void StreamPlayerWindow::decode() {
             decoder = codec ? avcodec_alloc_context3(codec) : nullptr;
             if (decoder) { decoder->thread_count = 1; decoder->flags |= AV_CODEC_FLAG_LOW_DELAY; }
             if (!decoder || avcodec_open2(decoder, codec, nullptr) < 0) { fail(text("Stream video decoder failed")); break; }
-            decoder->pkt_timebase = AVRational{1, 1000000};
-            waitKey = false;
-            DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop H264 decoder started id=%llu", (unsigned long long)p.id);
+            decoder->pkt_timebase = AVRational{1, 1000000}; waitKey = false;
         }
         av_packet_unref(packet);
         if (av_new_packet(packet, record.data.size()) < 0) { fail(text("Stream decoder allocation failed")); break; }
-        std::memcpy(packet->data, record.data.constData(), static_cast<size_t>(record.data.size()));
-        packet->pts = packet->dts = static_cast<int64_t>(record.pts);
+        std::memcpy(packet->data, record.data.constData(), (size_t)record.data.size());
+        packet->pts = packet->dts = (int64_t)record.pts;
         int sent = avcodec_send_packet(decoder, packet);
-        if (sent < 0) {
-            DEBUG_WARN(DEBUG_CATEGORY_STREAM, "desktop H264 packet rejected result=%d id=%llu", sent, (unsigned long long)p.id);
-            reset(); deadline = nowUs() + 10000000; continue;
-        }
+        if (sent < 0) { DEBUG_WARN(DEBUG_CATEGORY_STREAM, "desktop H264 packet rejected result=%d", sent); reset(true); continue; }
         int received;
         while ((received = avcodec_receive_frame(decoder, frame)) == 0) {
             decoded++;
-            if (frame->width <= 0 || frame->height <= 0 || frame->width > 4096 || frame->height > 4096) {
-                fail(text("Invalid stream video dimensions")); p.running = false; break;
-            }
-            int64_t pts = frame->best_effort_timestamp == AV_NOPTS_VALUE ? static_cast<int64_t>(record.pts) : frame->best_effort_timestamp;
-            {
-                std::lock_guard<std::mutex> guard(p.lock);
-                if (p.videoBase < 0) {
-                    while (!p.audios.empty() && p.audios.front().pts + 20000 <= pts) {
-                        prerollSamples += 960; p.audios.pop_front();
-                    }
-                    if (!p.audios.empty() && p.audios.front().pts < pts) {
-                        p.audios.front().offset = static_cast<unsigned>((pts - p.audios.front().pts) * 48000 + 999999) / 1000000;
-                        prerollSamples += p.audios.front().offset;
-                    }
-                    p.prefillUntil = nowUs() + 150000; p.videoBase = pts; p.videoAt = p.prefillUntil;
-                    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop playback start id=%llu pts=%lld prefill_ms=150 preroll_frames=%llu audioQ=%zu",
-                               (unsigned long long)p.id, (long long)pts, (unsigned long long)prerollSamples, p.audios.size());
-                    prerollSamples = 0;
-                }
-                if (pts < p.clock(nowUs()) - 100000) { discarded++; late++; continue; }
-            }
-            converter = sws_getCachedContext(converter, frame->width, frame->height, static_cast<AVPixelFormat>(frame->format),
+            int64_t pts = frame->best_effort_timestamp == AV_NOPTS_VALUE ? (int64_t)record.pts : frame->best_effort_timestamp;
+            { std::lock_guard<std::mutex> guard(p.lock); if (pts < p.clock(nowUs()) - 100000) { discarded++; continue; } }
+            converter = sws_getCachedContext(converter, frame->width, frame->height, (AVPixelFormat)frame->format,
                 frame->width, frame->height, AV_PIX_FMT_RGB24, SWS_BILINEAR, nullptr, nullptr, nullptr);
             QImage image(frame->width, frame->height, QImage::Format_RGB888);
-            if (!converter || image.isNull()) { fail(text("Stream decoder allocation failed")); p.running = false; break; }
+            if (!converter || image.isNull()) { fail(text("Stream video conversion failed")); p.running = false; break; }
             uint8_t* destination[] = {image.bits(), nullptr, nullptr, nullptr};
-            int strides[] = {static_cast<int>(image.bytesPerLine()), 0, 0, 0};
+            int strides[] = {(int)image.bytesPerLine(), 0, 0, 0};
             if (sws_scale(converter, frame->data, frame->linesize, 0, frame->height, destination, strides) != frame->height) {
                 fail(text("Stream video conversion failed")); p.running = false; break;
             }
             if (record.format.rotation) image = image.transformed(QTransform().rotate(record.format.rotation));
             std::lock_guard<std::mutex> guard(p.lock);
-            size_t bytes = static_cast<size_t>(image.sizeInBytes());
-            // Будущие кадры ждут аудиочасы; при пределе памяти сохраняем ближайшие к показу.
-            if (p.videos.size() >= 128 || p.videoBytes + bytes > 256u * 1024u * 1024u) {
-                discarded++; pressureDropped++; continue;
-            }
-            p.videoBytes += bytes;
-            p.videos.push_back({std::move(image), pts});
+            p.videoBytes += (size_t)image.sizeInBytes(); p.videos.push_back({std::move(image), pts});
         }
         if (received != AVERROR(EAGAIN) && received != AVERROR_EOF && p.running) {
-            DEBUG_WARN(DEBUG_CATEGORY_STREAM, "desktop H264 decode rejected result=%d id=%llu", received, (unsigned long long)p.id);
-            reset(); deadline = nowUs() + 10000000;
+            DEBUG_WARN(DEBUG_CATEGORY_STREAM, "desktop H264 decode rejected result=%d", received); reset(true);
         }
-        if (nowUs() - reportAt >= 1000000) {
-            int64_t now = nowUs(); double seconds = (now - reportAt) / 1000000.0; reportAt = now;
-            std::lock_guard<std::mutex> guard(p.lock); int64_t clock = p.clock(now);
+        if (nowUs() - report >= 1000000) {
+            int64_t now = nowUs(); double seconds = (now - report) / 1000000.0; report = now;
+            std::lock_guard<std::mutex> guard(p.lock);
             DEBUG_DEBUG(DEBUG_CATEGORY_STREAM,
-                       "desktop viewer id=%llu decoded=%llu discarded=%llu late=%llu pressure=%llu shown=%llu decodeFps=%.1f showFps=%.1f "
-                       "videoQ=%zu videoBytes=%zu firstAheadUs=%lld lastAheadUs=%lld audioQ=%zu audioAtDeltaUs=%lld underruns=%llu",
-                       (unsigned long long)p.id, (unsigned long long)decoded, (unsigned long long)discarded,
-                       (unsigned long long)late, (unsigned long long)pressureDropped, (unsigned long long)p.shown,
-                       (decoded - previousDecoded) / seconds, (p.shown - previousShown) / seconds, p.videos.size(), p.videoBytes,
-                       (long long)(p.videos.empty() ? 0 : p.videos.front().pts - clock),
-                       (long long)(p.videos.empty() ? 0 : p.videos.back().pts - clock), p.audios.size(),
-                       (long long)(p.audioPts < 0 ? 0 : now - p.audioAt), (unsigned long long)p.underruns);
-            if (pressureDropped != previousPressure)
-                DEBUG_WARN(DEBUG_CATEGORY_STREAM, "desktop video queue pressure id=%llu dropped=%llu; preserve due frames",
-                                           (unsigned long long)p.id, (unsigned long long)pressureDropped);
-            previousDecoded = decoded; previousShown = p.shown; previousPressure = pressureDropped;
+                        "desktop viewer id=%llu decoded=%llu discarded=%llu shown=%llu showFps=%.1f videoQ=%zu "
+                        "clock=%lld reserve_us=%lld minimum_us=%lld tempo=%d lead_us=%lld underruns=%llu",
+                        (unsigned long long)p.id, (unsigned long long)decoded, (unsigned long long)discarded,
+                        (unsigned long long)p.shown, (p.shown - reportedShown) / seconds, p.videos.size(), (long long)p.position,
+                        (long long)p.timing.reserve_us, (long long)p.timing.minimum_us, p.timing.tempo_milli,
+                        (long long)p.deviceLead, (unsigned long long)p.underruns);
+            reportedShown = p.shown;
         }
     }
     avcodec_free_context(&decoder); av_frame_free(&frame); av_packet_free(&packet);
     if (converter) sws_freeContext(converter);
-    opus_codec_decoder_destroy(opus);
 #endif
     gui_stream_stop(p.id);
     DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop decoder released id=%llu", (unsigned long long)p.id);