plugin: refactor into modules

1 files changed, 275 insertions, 0 deletions

diff --git a/plugin/src/Caelestia/Services/audiocollector.cpp b/plugin/src/Caelestia/Services/audiocollector.cpp
new file mode 100644
index 0000000..9dc3871
--- /dev/null
+++ b/plugin/src/Caelestia/Services/audiocollector.cpp
@@ -0,0 +1,275 @@
+#include "audiocollector.hpp"
+
+#include "service.hpp"
+#include <algorithm>
+#include <pipewire/pipewire.h>
+#include <qdebug.h>
+#include <qmutex.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/param/latency-utils.h>
+#include <stop_token>
+#include <vector>
+
+namespace caelestia {
+
+PipeWireWorker::PipeWireWorker(std::stop_token token, AudioCollector* collector)
+    : m_loop(nullptr)
+    , m_stream(nullptr)
+    , m_timer(nullptr)
+    , m_idle(true)
+    , m_token(token)
+    , m_collector(collector) {
+    pw_init(nullptr, nullptr);
+
+    m_loop = pw_main_loop_new(nullptr);
+    if (!m_loop) {
+        qWarning() << "PipeWireWorker::init: failed to create PipeWire main loop";
+        pw_deinit();
+        return;
+    }
+
+    timespec timeout = { 0, 10 * SPA_NSEC_PER_MSEC };
+    m_timer = pw_loop_add_timer(pw_main_loop_get_loop(m_loop), handleTimeout, this);
+    pw_loop_update_timer(pw_main_loop_get_loop(m_loop), m_timer, &timeout, &timeout, false);
+
+    auto props = pw_properties_new(
+        PW_KEY_MEDIA_TYPE, "Audio", PW_KEY_MEDIA_CATEGORY, "Capture", PW_KEY_MEDIA_ROLE, "Music", nullptr);
+    pw_properties_set(props, PW_KEY_STREAM_CAPTURE_SINK, "true");
+    pw_properties_setf(props, PW_KEY_NODE_LATENCY, "%u/%u", nextPowerOf2(512 * collector->sampleRate() / 48000),
+        collector->sampleRate());
+    pw_properties_set(props, PW_KEY_NODE_PASSIVE, "true");
+    pw_properties_set(props, PW_KEY_NODE_VIRTUAL, "true");
+    pw_properties_set(props, PW_KEY_STREAM_DONT_REMIX, "false");
+    pw_properties_set(props, "channelmix.upmix", "true");
+
+    std::vector<uint8_t> buffer(collector->chunkSize());
+    spa_pod_builder b;
+    spa_pod_builder_init(&b, buffer.data(), static_cast<quint32>(buffer.size()));
+
+    spa_audio_info_raw info{};
+    info.format = SPA_AUDIO_FORMAT_S16;
+    info.rate = collector->sampleRate();
+    info.channels = 1;
+
+    const spa_pod* params[1];
+    params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat, &info);
+
+    pw_stream_events events{};
+    events.state_changed = [](void* data, pw_stream_state, pw_stream_state state, const char*) {
+        auto* self = static_cast<PipeWireWorker*>(data);
+        self->streamStateChanged(state);
+    };
+    events.process = [](void* data) {
+        auto* self = static_cast<PipeWireWorker*>(data);
+        self->processStream();
+    };
+
+    m_stream = pw_stream_new_simple(pw_main_loop_get_loop(m_loop), "caelestia-shell", props, &events, this);
+
+    const int success = pw_stream_connect(m_stream, PW_DIRECTION_INPUT, collector->nodeId(),
+        static_cast<pw_stream_flags>(
+            PW_STREAM_FLAG_AUTOCONNECT | PW_STREAM_FLAG_MAP_BUFFERS | PW_STREAM_FLAG_RT_PROCESS),
+        params, 1);
+    if (success < 0) {
+        qWarning() << "PipeWireWorker::init: failed to connect stream";
+        pw_stream_destroy(m_stream);
+        pw_main_loop_destroy(m_loop);
+        pw_deinit();
+        return;
+    }
+
+    pw_main_loop_run(m_loop);
+
+    pw_stream_destroy(m_stream);
+    pw_main_loop_destroy(m_loop);
+    pw_deinit();
+}
+
+void PipeWireWorker::handleTimeout(void* data, uint64_t expirations) {
+    auto* self = static_cast<PipeWireWorker*>(data);
+
+    if (self->m_token.stop_requested()) {
+        pw_main_loop_quit(self->m_loop);
+        return;
+    }
+
+    if (!self->m_idle) {
+        if (expirations < 10) {
+            self->m_collector->clearBuffer();
+        } else {
+            self->m_idle = true;
+            timespec timeout = { 0, 500 * SPA_NSEC_PER_MSEC };
+            pw_loop_update_timer(pw_main_loop_get_loop(self->m_loop), self->m_timer, &timeout, &timeout, false);
+        }
+    }
+}
+
+void PipeWireWorker::streamStateChanged(pw_stream_state state) {
+    m_idle = false;
+    switch (state) {
+    case PW_STREAM_STATE_PAUSED: {
+        timespec timeout = { 0, 10 * SPA_NSEC_PER_MSEC };
+        pw_loop_update_timer(pw_main_loop_get_loop(m_loop), m_timer, &timeout, &timeout, false);
+        break;
+    }
+    case PW_STREAM_STATE_STREAMING:
+        pw_loop_update_timer(pw_main_loop_get_loop(m_loop), m_timer, nullptr, nullptr, false);
+        break;
+    case PW_STREAM_STATE_ERROR:
+        pw_main_loop_quit(m_loop);
+        break;
+    default:
+        break;
+    }
+}
+
+void PipeWireWorker::processStream() {
+    if (m_token.stop_requested()) {
+        pw_main_loop_quit(m_loop);
+        return;
+    }
+
+    pw_buffer* buffer = pw_stream_dequeue_buffer(m_stream);
+    if (buffer == nullptr) {
+        return;
+    }
+
+    const spa_buffer* buf = buffer->buffer;
+    const qint16* samples = reinterpret_cast<const qint16*>(buf->datas[0].data);
+    if (samples == nullptr) {
+        return;
+    }
+
+    const quint32 count = buf->datas[0].chunk->size / 2;
+    m_collector->loadChunk(samples, count);
+
+    pw_stream_queue_buffer(m_stream, buffer);
+}
+
+unsigned int PipeWireWorker::nextPowerOf2(unsigned int n) {
+    if (n == 0) {
+        return 1;
+    }
+
+    n--;
+    n |= n >> 1;
+    n |= n >> 2;
+    n |= n >> 4;
+    n |= n >> 8;
+    n |= n >> 16;
+    n++;
+
+    return n;
+}
+
+AudioCollector::AudioCollector(QObject* parent)
+    : Service(parent)
+    , m_sampleRate(44100)
+    , m_chunkSize(512)
+    , m_nodeId(PW_ID_ANY)
+    , m_buffer1(m_chunkSize)
+    , m_buffer2(m_chunkSize)
+    , m_readBuffer(&m_buffer1)
+    , m_writeBuffer(&m_buffer2) {}
+
+AudioCollector::~AudioCollector() {
+    stop();
+}
+
+quint32 AudioCollector::sampleRate() const {
+    return m_sampleRate;
+}
+
+quint32 AudioCollector::chunkSize() const {
+    return m_chunkSize;
+}
+
+quint32 AudioCollector::nodeId() {
+    QMutexLocker locker(&m_nodeIdMutex);
+    return m_nodeId;
+}
+
+void AudioCollector::setNodeId(quint32 nodeId) {
+    {
+        QMutexLocker locker(&m_nodeIdMutex);
+
+        if (nodeId == m_nodeId) {
+            return;
+        }
+
+        m_nodeId = nodeId;
+    }
+    emit nodeIdChanged();
+
+    if (m_thread.joinable()) {
+        stop();
+        start();
+    }
+}
+
+void AudioCollector::clearBuffer() {
+    auto* writeBuffer = m_writeBuffer.load(std::memory_order_relaxed);
+    std::fill(writeBuffer->begin(), writeBuffer->end(), 0.0f);
+
+    auto* oldRead = m_readBuffer.exchange(writeBuffer, std::memory_order_acq_rel);
+    m_writeBuffer.store(oldRead, std::memory_order_release);
+}
+
+void AudioCollector::loadChunk(const qint16* samples, quint32 count) {
+    if (count > m_chunkSize) {
+        count = m_chunkSize;
+    }
+
+    auto* writeBuffer = m_writeBuffer.load(std::memory_order_relaxed);
+    std::transform(samples, samples + count, writeBuffer->begin(), [](qint16 sample) {
+        return sample / 32768.0f;
+    });
+
+    auto* oldRead = m_readBuffer.exchange(writeBuffer, std::memory_order_acq_rel);
+    m_writeBuffer.store(oldRead, std::memory_order_release);
+}
+
+quint32 AudioCollector::readChunk(float* out, quint32 count) {
+    if (count == 0 || count > m_chunkSize) {
+        count = m_chunkSize;
+    }
+
+    auto* readBuffer = m_readBuffer.load(std::memory_order_acquire);
+    std::memcpy(out, readBuffer->data(), count * sizeof(float));
+
+    return count;
+}
+
+quint32 AudioCollector::readChunk(double* out, quint32 count) {
+    if (count == 0 || count > m_chunkSize) {
+        count = m_chunkSize;
+    }
+
+    auto* readBuffer = m_readBuffer.load(std::memory_order_acquire);
+    std::transform(readBuffer->begin(), readBuffer->begin() + count, out, [](float sample) {
+        return static_cast<double>(sample);
+    });
+
+    return count;
+}
+
+void AudioCollector::start() {
+    if (m_thread.joinable()) {
+        return;
+    }
+
+    clearBuffer();
+
+    m_thread = std::jthread([this](std::stop_token token) {
+        PipeWireWorker worker(token, this);
+    });
+}
+
+void AudioCollector::stop() {
+    if (m_thread.joinable()) {
+        m_thread.request_stop();
+        m_thread.join();
+    }
+}
+
+} // namespace caelestia