Connect desktop camera workers to negotiated call video and audio clock
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#include "call_video_engine.h"
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#include "call_video_encoder.h"
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#include "call_video_decoder.h"
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#include "../../../src/call/call_video_port.h"
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#include "../../../src/call/call_audio.h"
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#include "debug_config.h"
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#include "mem.h"
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#include <thread>
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#include <mutex>
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#include <atomic>
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#include <deque>
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#include <chrono>
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#ifdef HAVE_STREAM_CAPTURE
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#include <QCamera>
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#include <QCameraDevice>
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#include <QMediaDevices>
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#include <QMediaCaptureSession>
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#include <QVideoSink>
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#include <QVideoFrame>
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#endif
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namespace {
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int64_t nowUs() { return std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::steady_clock::now().time_since_epoch()).count(); }
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void idle() { std::this_thread::sleep_for(std::chrono::milliseconds(5)); }
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}
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struct CallVideoEngine::Impl {
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std::mutex lock;
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std::thread tx, rx;
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std::atomic<bool> running{false};
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uint64_t id = 0, revision = 1;
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bool enabled = false;
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int width = 640, height = 480, codec = 0;
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int64_t pts = -1, backend = -1, anchor = -1;
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QImage shown;
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uint64_t shownSerial = 0, deliveredSerial = 0;
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QString status;
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bool statusDirty = false;
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void report(const QString& text) {
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std::lock_guard<std::mutex> guard(lock); status = text; statusDirty = true;
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DEBUG_INFO(DEBUG_CATEGORY_CALL, "desktop video: %s", qPrintable(text));
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}
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#ifdef HAVE_STREAM_CAPTURE
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std::unique_ptr<QCamera> camera;
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std::unique_ptr<QMediaCaptureSession> capture;
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std::unique_ptr<QVideoSink> sink;
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QVideoFrame raw;
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#endif
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};
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CallVideoEngine::CallVideoEngine(QObject* parent) : QObject(parent), m(std::make_unique<Impl>()) {
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m_timer.setInterval(20);
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connect(&m_timer, &QTimer::timeout, this, [this] {
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QImage image; QString status; bool changed = false, report = false;
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{ std::lock_guard<std::mutex> guard(m->lock);
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if (m->shownSerial != m->deliveredSerial) { image = m->shown; m->deliveredSerial = m->shownSerial; changed = true; }
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if (m->statusDirty) { status = m->status; m->statusDirty = false; report = true; } }
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if (changed) emit imageChanged(image);
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if (report) emit statusChanged(status);
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});
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}
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CallVideoEngine::~CallVideoEngine() { stop(); }
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QList<QPair<QString, QByteArray>> CallVideoEngine::cameras() {
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QList<QPair<QString, QByteArray>> result;
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#ifdef HAVE_STREAM_CAPTURE
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for (const auto& camera : QMediaDevices::videoInputs()) result.append({camera.description(), camera.id()});
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#endif
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return result;
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}
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void CallVideoEngine::start(quint64 id) {
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if (m->running && m->id == id) return;
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stop(); m->id = id; m->running = true; m_timer.start();
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try { m->tx = std::thread(&CallVideoEngine::transmit, this); m->rx = std::thread(&CallVideoEngine::receive, this); }
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catch (const std::exception& error) { DEBUG_ERROR(DEBUG_CATEGORY_CALL, "video worker start: %s", error.what()); stop(); emit statusChanged(error.what()); }
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}
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void CallVideoEngine::closeCamera() {
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#ifdef HAVE_STREAM_CAPTURE
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if (m->sink) disconnect(m->sink.get(), nullptr, this, nullptr);
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if (m->camera) { disconnect(m->camera.get(), nullptr, this, nullptr); m->camera->stop(); }
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m->capture.reset(); m->camera.reset(); m->sink.reset();
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std::lock_guard<std::mutex> guard(m->lock); m->raw = {}; m->pts = m->backend = m->anchor = -1;
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#endif
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}
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void CallVideoEngine::stop() {
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m->running = false; m_timer.stop(); closeCamera();
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if (m->tx.joinable()) m->tx.join();
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if (m->rx.joinable()) m->rx.join();
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if (m->id) call_video_port_close(m->id);
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m->id = 0; m->enabled = false; m->shown = {}; emit imageChanged({});
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}
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void CallVideoEngine::setVideo(bool enabled, const QByteArray& cameraId, int width, int height, int codec) {
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closeCamera();
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uint64_t revision;
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{ std::lock_guard<std::mutex> guard(m->lock);
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m->enabled = enabled; m->width = width; m->height = height; m->codec = codec; revision = ++m->revision; }
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if (!enabled || !m->running) return;
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#ifdef HAVE_STREAM_CAPTURE
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QCameraDevice selected;
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for (const auto& camera : QMediaDevices::videoInputs()) if (camera.id() == cameraId) selected = camera;
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if (selected.isNull()) { m->report(tr("Camera is unavailable")); return; }
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m->capture = std::make_unique<QMediaCaptureSession>(); m->sink = std::make_unique<QVideoSink>();
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m->camera = std::make_unique<QCamera>(selected); m->capture->setCamera(m->camera.get()); m->capture->setVideoSink(m->sink.get());
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QCameraFormat best; int distance = INT_MAX;
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for (const auto& f : selected.videoFormats()) {
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if (f.maxFrameRate() < 29.9) continue;
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int score = std::abs(f.resolution().width() - width) + std::abs(f.resolution().height() - height);
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if (score < distance) { best = f; distance = score; }
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}
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if (!best.isNull()) m->camera->setCameraFormat(best);
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connect(m->sink.get(), &QVideoSink::videoFrameChanged, this, [this, revision](const QVideoFrame& frame) {
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if (!frame.isValid() || !m->running) return;
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std::lock_guard<std::mutex> guard(m->lock);
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if (revision != m->revision) return;
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int64_t pts = nowUs();
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if (frame.startTime() >= 0) {
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if (m->backend < 0) {
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m->backend = frame.startTime(); m->anchor = pts;
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DEBUG_INFO(DEBUG_CATEGORY_CALL, "camera clock source=%lld monotonic=%lld calibration=arrival-estimate",
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(long long)m->backend, (long long)m->anchor);
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}
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pts = m->anchor + frame.startTime() - m->backend;
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}
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if (pts > m->pts) { m->raw = frame; m->pts = pts; }
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}, Qt::DirectConnection);
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connect(m->camera.get(), &QCamera::errorOccurred, this, [this](QCamera::Error, const QString& error) {
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DEBUG_ERROR(DEBUG_CATEGORY_CALL, "call camera failed: %s", qPrintable(error)); m->report(error);
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});
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m->camera->start();
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#else
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Q_UNUSED(cameraId); Q_UNUSED(revision); m->report(tr("Video capture is unavailable in this build"));
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#endif
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}
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void CallVideoEngine::transmit() {
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call_video_caps caps{};
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// Каждый объявленный codec проверяется реальным encoder + независимым decoder при open.
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for (unsigned codec = 1; codec <= 2 && m->running; ++codec) {
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call_video_format probe{1, 1280, 720, 30, 0, (uint8_t)codec, (uint8_t)(codec == 1 ? 31 : 93), 4000000, 1000000};
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CallVideoEncoder encoder;
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if (encoder.open(probe, 1000000)) {
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call_video_limit limit{1280, 720, 30, 1280 * 720 * 30, 4000000, 1000000, probe.level};
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caps.encode[codec - 1] = caps.decode[codec - 1] = limit;
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} else DEBUG_WARN(DEBUG_CATEGORY_CALL, "call codec probe unavailable codec=%u: %s", codec, qPrintable(encoder.error()));
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}
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if (!m->running) return;
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if (call_video_port_open(m->id, &caps) < 0) { m->report(tr("Video transport is unavailable")); return; }
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CallVideoEncoder encoder;
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call_video_format format{};
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uint64_t appliedRevision = 0, keySerial = 0, request = 0, frameId = 0;
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int64_t lastPts = -1, lastKey = -1;
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bool forceKey = true;
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while (m->running) {
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call_video_port_status state{};
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if (call_video_port_status(m->id, &state) < 0) break;
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uint64_t revision; bool enabled; int width, height, codec; int64_t pts;
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#ifdef HAVE_STREAM_CAPTURE
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QVideoFrame raw;
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#endif
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{ std::lock_guard<std::mutex> guard(m->lock);
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revision = m->revision; enabled = m->enabled; width = m->width; height = m->height; codec = m->codec; pts = m->pts;
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#ifdef HAVE_STREAM_CAPTURE
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raw = m->raw;
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#endif
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}
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if (!enabled || !state.have_peer || pts <= lastPts || (lastPts >= 0 && pts - lastPts < 33333)) { idle(); continue; }
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if (revision != appliedRevision) {
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if (lastKey >= 0 && pts - lastKey < 1000000) { idle(); continue; }
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call_video_format next{format.generation + 1, (uint16_t)width, (uint16_t)height, 30, 0, (uint8_t)codec, 0, 4000000, 1000000};
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if (call_video_choose(&caps, &state.peer, &next) <= 0 || !encoder.open(next, 1000000)) {
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m->report(tr("Selected video mode is unavailable to the peer"));
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std::lock_guard<std::mutex> guard(m->lock); if (m->revision == revision) m->enabled = false;
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continue;
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}
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format = next; appliedRevision = revision; forceKey = true; request = 0;
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if (call_video_port_format(m->id, &format, encoder.bitrate()) < 0) break;
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m->report(QString("%1 · %2×%3 · %4 kbit/s").arg(format.codec == 2 ? "H.265" : "H.264").arg(width).arg(height).arg(encoder.bitrate() / 1000));
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}
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if (state.configured_generation != format.generation) { idle(); continue; }
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if (state.key_serial != keySerial) { keySerial = state.key_serial; forceKey = true; }
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if (state.rate_generation == format.generation && state.rate_request > request) {
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request = state.rate_request;
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if (!encoder.requestBitrate(format.generation, request, state.rate_bps))
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call_video_port_applied(m->id, format.generation, request, 0);
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}
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#ifdef HAVE_STREAM_CAPTURE
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QImage image = raw.toImage();
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if (image.isNull()) { DEBUG_WARN(DEBUG_CATEGORY_CALL, "camera frame conversion failed"); lastPts = pts; continue; }
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LiveEncodedFrame output; CallVideoRateCompletion completion;
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bool encoded = encoder.encode(image, pts, forceKey, output, completion); lastPts = pts;
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if (completion.request) {
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call_video_port_applied(m->id, completion.generation, completion.request, completion.bitrate);
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m->report(QString("%1 · %2×%3 · %4 kbit/s").arg(format.codec == 2 ? "H.265" : "H.264")
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.arg(format.width).arg(format.height).arg(encoder.bitrate() / 1000));
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}
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if (!encoded) { forceKey = true; m->report(encoder.error()); continue; }
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if (output.key) lastKey = pts;
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call_video_frame packet{};
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packet.call_id = m->id; packet.frame_id = ++frameId; packet.pts_us = pts; packet.format = format;
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packet.size = packet.length = output.data.size(); packet.data = reinterpret_cast<const uint8_t*>(output.data.constData());
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packet.flags = output.key ? CALL_VIDEO_KEY : 0;
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forceKey = call_video_port_send(&packet) != 1;
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#else
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idle();
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#endif
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}
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}
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void CallVideoEngine::receive() {
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struct Picture { int64_t pts; QImage image; };
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std::deque<Picture> pictures;
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CallVideoDecoder decoder;
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uint64_t sourceEpoch = 0; int64_t lastShown = -1, report = 0; unsigned shown = 0;
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while (m->running) {
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int64_t now = nowUs(); call_clock_snapshot clock{};
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call_audio_get_clock(m->id, now, &clock);
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if (clock.valid) {
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if (sourceEpoch && sourceEpoch != clock.source_epoch) {
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pictures.clear(); decoder.close(); call_video_port_request_key(m->id); lastShown = -1;
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DEBUG_INFO(DEBUG_CATEGORY_CALL, "video playback audio source epoch changed");
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}
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sourceEpoch = clock.source_epoch;
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QImage selected;
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while (!pictures.empty() && pictures.front().pts <= clock.pts_us) {
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if (pictures.front().pts > lastShown) { selected = pictures.front().image; lastShown = pictures.front().pts; }
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pictures.pop_front();
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}
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if (!selected.isNull()) { std::lock_guard<std::mutex> guard(m->lock); m->shown = selected; ++m->shownSerial; ++shown; }
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}
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if (pictures.size() < 16) {
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call_video_frame packet{};
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if (call_video_port_pull(m->id, &packet) == 1) {
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QImage image;
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if (decoder.decode(packet, image)) pictures.push_back({packet.pts_us, image});
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else call_video_port_request_key(m->id);
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u_free((void*)packet.data); continue;
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}
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}
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if (now - report >= 1000000) {
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DEBUG_DEBUG(DEBUG_CATEGORY_CALL, "video playback shown=%u queue=%zu audio_valid=%d audio_pts=%lld video_pts=%lld",
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shown, pictures.size(), clock.valid, (long long)clock.pts_us, (long long)lastShown); report = now;
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}
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idle();
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}
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}
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@@ -0,0 +1,27 @@
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#pragma once
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#include <QObject>
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#include <QImage>
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#include <QTimer>
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#include <memory>
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// GUI владеет камерой, TX/RX workers — codec; отображение читает фактический audio clock.
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class CallVideoEngine : public QObject {
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Q_OBJECT
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public:
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explicit CallVideoEngine(QObject* parent = nullptr);
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~CallVideoEngine() override;
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void start(quint64 id);
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void stop();
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void setVideo(bool enabled, const QByteArray& camera, int width, int height, int codec);
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static QList<QPair<QString, QByteArray>> cameras();
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signals:
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void imageChanged(const QImage& image);
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void statusChanged(const QString& status);
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private:
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struct Impl;
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std::unique_ptr<Impl> m;
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QTimer m_timer;
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void closeCamera();
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void transmit();
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void receive();
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};
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