Reintegrate projectM Visualizer

Gustavo L Conte

in time, i just saw initializeGL with only BLEND command. All of those are required!!! Sorry if I did not express myself correctly. BLEND does the trick for the blank/black screens, but some visual bugs happens in lots of presets without the complete set.

glShadeModel(GL_SMOOTH);
glClearColor(0, 0, 0, 0);
glViewport(0, 0, width(), height());
glMatrixMode(GL_TEXTURE);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glDrawBuffer(GL_BACK);
glReadBuffer(GL_BACK);
glEnable(GL_BLEND);

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_LINE_SMOOTH);
glEnable(GL_POINT_SMOOTH);
glClearColor(0.0F, 0.0F, 0.0F, 0.0F);
glLineStipple(2, 0xAAAA);

ALSO, you need to run the commands always before renderFrame, at drawBackground method.

Gustavo L Conte

Now, here's another one to worry about:

A few days ago I installed those newest cream-of-cream set of plugins. Awesome by the way.
They seem all working fine. I spent days testing on random mode. I still want to compare one by one with the SDL app.

Now, problem is, when I go to the select visualization window, all the previews gets bugged if The first ones of the list (mostly called "Fast transition..") are selected. They don't seem to be normal plugins. Anyway, Thing is, if you select for preview any of these first ones, it bugs all other subsequent plugins. glClear color is not black anymore and they render all dumb. Only restarting Strawberry for normal behaviour again.
Gonna look at the milkdrop code, later, to compare the "normal" ones from these "Fast transition..." ones.

Screenshot from 2024-07-17 18-09-40.png

jonas

@Gustavo-L-Conte
Thanks for looking into it. It seems that projectm version 3 is buggy, I think we should try to get version 4 working instead, and drop support for version 3. See the discussion on https://github.com/orgs/projectM-visualizer/discussions/820

Gustavo L Conte

@jonas roger that, gonna go back focus v4
By the way I did compile latest git from v4 with his fixes, and tested with branch visualisations, did not work, same results. I'm curious about QOpenGLWindow results, with his fixes.

Gustavo L Conte

I had success starting to display stuff with v4 using QOpenGLWindow in a separate, smaller program. Soon I'll upload the code, I just need to adjust some things like resize and OpenGL context. I've used as ConsumeBuffer the pulseaudio capture code. I just need to adjust some stuff i think to make it better, but i got so excited about a positive display in v4 that i wanted to share ASAP

LoooooooooooooooooooooooooooL!

PS: still, several GL error 1282 in the majority of presets tested.

Screenshot from 2024-07-24 09-19-42.png

while some actually works

Screenshot from 2024-07-24 10-07-52.png

Gustavo L Conte

current status

the FPS on the video is very low due: * frameskipping at the desktop recorder

fps was set t o 10 fps for testing purposes on projectm instance

Gustavo L Conte

I'm probably NOT the founder of the I.O.G.L.N.U.S.A.H.A.

Tthe International Open GL NEVER Ugonna SLEEP AGAIN ha ha ha Society.

Decided to go ahead and do the QOpenGLWindow on Strawberry.

Screenshot from 2024-07-25 04-18-33.png

Its worse than just the standalone program. Much more bugs. But the few that works are incredible. We are close. Here's what I've been messing around with my IogLnusaha association (I'm on Gnomes)

// Create and setup the QOpenGLWindow
  auto *openGLWindow_ = new VisualizationOpenGLWidget(projectm_visualization_);
  QSurfaceFormat format;
  format.setVersion(3, 3);  // Set OpenGL version to 3.3
  format.setProfile(QSurfaceFormat::CoreProfile);  // Use the core profile
  format.setDepthBufferSize(24);
  format.setStencilBufferSize(8);
  openGLWindow_->setFormat(format);
  openGLWindow_->resize(1280, 720); // Default size for the OpenGL window

  // Wrap the QOpenGLWindow in a QWidget container
  auto *glContainer = QWidget::createWindowContainer(openGLWindow_);
  glContainer->setFocusPolicy(Qt::TabFocus);
  glContainer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  glContainer->setParent(this);
  glContainer->setVisible(true);
  ////////////setCentralWidget(glContainer);

  // Add the overlay as a child of the container and set its visibility
  ////////////////overlay_->setParent(glContainer);
  /////////////////overlay_->resize(320, 200); // Resize the overlay 
  //////////////////overlay_->setVisible(true);

  }

#ifndef VISUALIZATIONOPENGLWIDGET_H
#define VISUALIZATIONOPENGLWIDGET_H

#include "config.h"

#include <QOpenGLWindow>
#include <QOpenGLFunctions>

class ProjectMVisualization;

class VisualizationOpenGLWidget : public QOpenGLWindow, protected QOpenGLFunctions {
  Q_OBJECT

 public:
    explicit VisualizationOpenGLWidget(ProjectMVisualization* projectm_visualization, QWindow* parent = nullptr);
  //explicit VisualizationOpenGLWidget(ProjectMVisualization *projectm_visualization, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
  //explicit OpenGLWidgetContainer(QOpenGLWindow* openGLWindow, QWidget* parent = nullptr);
  void initializeGL() override;

protected:
  void paintGL() override;
  void resizeGL(const int width, const int height) override;

 private:
  void Setup(const int width, const int height);

 private:
  ProjectMVisualization *projectm_visualization_;
};


#endif  // VISUALIZATIONOPENGLWIDGET_H

.cpp

#include "config.h"

#include <QPainter>

#include "core/logging.h"
#include "visualizationopenglwidget.h"
#include "projectmvisualization.h"

VisualizationOpenGLWidget::VisualizationOpenGLWidget(ProjectMVisualization *projectm_visualization, QWindow *parent)
  : QOpenGLWindow(NoPartialUpdate, parent),
    projectm_visualization_(projectm_visualization) {

    }

void VisualizationOpenGLWidget::initializeGL() {



  QOpenGLWindow::initializeGL();
  QOpenGLFunctions::initializeOpenGLFunctions();

    projectm_visualization_->Init();
  

}

void VisualizationOpenGLWidget::paintGL() {

  QPainter p(this);
  //////////resizeGL(width(), height());
  p.beginNativePainting();
  projectm_visualization_->RenderFrame(width(), height());
  p.endNativePainting();
  update();

  qLog(Debug) << __PRETTY_FUNCTION__ << glGetError();

}

void VisualizationOpenGLWidget::resizeGL(const int width, const int height) {

  
  Setup(width, height);
  projectm_visualization_->Resize(width, height);

}

void VisualizationOpenGLWidget::Setup(const int width, const int height) {

  glShadeModel(GL_SMOOTH);
  glClearColor(0, 0, 0, 0);
  glViewport(0, 0, width, height);
  glMatrixMode(GL_TEXTURE);
  glLoadIdentity();
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  glDrawBuffer(GL_BACK);
  glReadBuffer(GL_BACK);
  glEnable(GL_BLEND);

  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glEnable(GL_LINE_SMOOTH);
  glEnable(GL_POINT_SMOOTH);
  glClearColor(0.0F, 0.0F, 0.0F, 0.0F);
  glLineStipple(2, 0xAAAA);

}

ConsumeBuffer:

void ProjectMVisualization::ConsumeBuffer(GstBuffer *buffer, const int pipeline_id, const QString &format) {

  Q_UNUSED(pipeline_id);
  Q_UNUSED(format);

  GstMapInfo map;
  gst_buffer_map(buffer, &map, GST_MAP_READ);

#ifdef HAVE_PROJECTM4
  if (projectm_instance_) {
    const unsigned int samples_per_channel = static_cast<unsigned int> (map.size / sizeof(size_t)) / 2;
    const int16_t *data = reinterpret_cast<int16_t*>(map.data);
    projectm_pcm_add_int16(projectm_instance_, data, samples_per_channel, PROJECTM_STEREO);
  }
#else
  if (projectm_) {
    const short samples_per_channel = static_cast<short>(map.size) / sizeof(short) / 2;
    const short *data = reinterpret_cast<short*>(map.data);
    projectm_->pcm()->addPCM16Data(data, samples_per_channel);
  }
#endif  // HAVE_PROJECTM4

  gst_buffer_unmap(buffer, &map);
  gst_buffer_unref(buffer);

}

InitprojectM

// Create projectM settings
#ifdef HAVE_PROJECTM4
Q_ASSERT(projectm_instance_ == nullptr);
Q_ASSERT(projectm_playlist_instance_ == nullptr);
projectm_instance_ = projectm_create();
projectm_set_preset_duration(projectm_instance_, duration_);
// Set initial window size
  projectm_set_window_size(projectm_instance_, 1280, 720);
  // Additional ProjectM setup
  projectm_set_mesh_size(projectm_instance_, 32, 24);
  projectm_set_fps(projectm_instance_, 60);
  projectm_set_aspect_correction(projectm_instance_, true);
  projectm_set_hard_cut_enabled(projectm_instance_, true);
  projectm_set_hard_cut_duration(projectm_instance_, 10);
  projectm_set_hard_cut_sensitivity(projectm_instance_, 1.0);
  projectm_set_beat_sensitivity(projectm_instance_, 0.5);
  projectm_set_soft_cut_duration(projectm_instance_, 10);
  
//projectm_set_window_size(projectm_instance_, 512, 512);
const char *texture_search_paths[] = { "/usr/local/share/projectM/textures" };
projectm_set_texture_search_paths(projectm_instance_, texture_search_paths, 1);
projectm_playlist_instance_ = projectm_playlist_create(projectm_instance_);
projectm_playlist_set_shuffle(projectm_playlist_instance_, false);

"patched" SetImmediatePreset (FOR TESTING, but works on v3)
void ProjectMVisualization::SetImmediatePreset(const int index) {

#ifdef HAVE_PROJECTM4
  if (projectm_playlist_instance_) {
    projectm_playlist_set_position(projectm_playlist_instance_, index, true);
 /* projectm_playlist_play_previous(projectm_playlist_instance_, true);
    projectm_set_preset_duration(projectm_instance_, 1);
    projectm_set_preset_locked(projectm_instance_, false);

     QTimer::singleShot(1500, this, [index,this]() {
      projectm_set_preset_locked(projectm_instance_, true);
      projectm_set_preset_duration(projectm_instance_, duration_);
    }); */
  }
#else
  if (projectm_) {
    projectm_->selectPreset(index, true);
  }
#endif  // HAVE_PROJECTM4

}

It appears that when it wraps to a QWidget, the shader codes don't like and start to stop doing its things. ITs not a matter of context, but its like a corruption happens when you wrap.
I could manage to bind key_S to open the visualizations selector, when setting as central, because I could not figure out why the overlay and interface don't work

Gustavo L Conte

this version I posted works MUCH better giving nice results with the cream-of-cream presets, Screenshot from 2024-07-25 05-32-42.png

Gustavo L Conte

void VisualizationOpenGLWidget::paintGL() {

  QPainter p(this);
  p.beginNativePainting();
  
  int w = width(); int h = height();
  this->resize(w*2,h*2);
  if (projectm_visualization_) {
    projectm_visualization_->Resize(w*2, h*2);
    projectm_visualization_->RenderFrame(w*2,h*2);
  }
  update();
  this->resize(w,h);
  if (projectm_visualization_) {
    projectm_visualization_->Resize(w, h);
    projectm_visualization_->RenderFrame(w,h);
  }
  update();

   p.endNativePainting();

  qLog(Debug) << __PRETTY_FUNCTION__ << glGetError();

}

Its disgusting, but it really makes a HUGE percentage of presets to display instead of black screen.
Ive done this without wraping the openglwindow into a widget;
when you resize the window, it displays, several plugins happens that way.. actually the nicer ones like this one:

Screenshot from 2024-07-25 09-44-48.png

Gustavo L Conte

VisualizationContainer::VisualizationContainer(QWidget *parent)
    : QMainWindow(parent),
      projectm_visualization_(new ProjectMVisualization(this)),
      overlay_(new VisualizationOverlay),
      selector_(new VisualizationSelector(this)),
      overlay_proxy_(nullptr),
      engine_(nullptr),
      menu_(new QMenu(this)),
      fps_(kDefaultFps),
      size_(kDefaultTextureSize) {

    setWindowTitle(tr("Visualizations"));
    setWindowIcon(IconLoader::Load(QStringLiteral("strawberry")));
    setMinimumSize(64, 64);

    {
        Settings s;
        s.beginGroup(QLatin1String(kSettingsGroup));
        if (!restoreGeometry(s.value("geometry").toByteArray())) {
            resize(kDefaultWidth, kDefaultHeight);
        }
        fps_ = s.value("fps", kDefaultFps).toInt();
        size_ = s.value("size", kDefaultTextureSize).toInt();
        s.endGroup();
    }

    QShortcut *close = new QShortcut(QKeySequence::Close, this);
    QObject::connect(close, &QShortcut::activated, this, &VisualizationContainer::close);

    QObject::connect(overlay_, &VisualizationOverlay::OpacityChanged, this, &VisualizationContainer::ChangeOverlayOpacity);
    QObject::connect(overlay_, &VisualizationOverlay::ShowPopupMenu, this, &VisualizationContainer::ShowPopupMenu);
    ChangeOverlayOpacity(1.0);

    projectm_visualization_->SetTextureSize(size_);
    SizeChanged();

    selector_->SetVisualization(projectm_visualization_);

    menu_->addAction(IconLoader::Load(QStringLiteral("view-fullscreen")), tr("Toggle fullscreen"), this, &VisualizationContainer::ToggleFullscreen);

    QMenu *fps_menu = menu_->addMenu(tr("Framerate"));
    QActionGroup *fps_group = new QActionGroup(this);
    AddFramerateMenuItem(tr("Low (%1 fps)").arg(kLowFramerate), kLowFramerate, fps_, fps_group);
    AddFramerateMenuItem(tr("Medium (%1 fps)").arg(kMediumFramerate), kMediumFramerate, fps_, fps_group);
    AddFramerateMenuItem(tr("High (%1 fps)").arg(kHighFramerate), kHighFramerate, fps_, fps_group);
    AddFramerateMenuItem(tr("Super high (%1 fps)").arg(kSuperHighFramerate), kSuperHighFramerate, fps_, fps_group);
    fps_menu->addActions(fps_group->actions());

    QMenu *quality_menu = menu_->addMenu(tr("Quality", "Visualization quality"));
    QActionGroup *quality_group = new QActionGroup(this);
    AddQualityMenuItem(tr("Low (256x256)"), 256, size_, quality_group);
    AddQualityMenuItem(tr("Medium (512x512)"), 512, size_, quality_group);
    AddQualityMenuItem(tr("High (1024x1024)"), 1024, size_, quality_group);
    AddQualityMenuItem(tr("Super high (2048x2048)"), 2048, size_, quality_group);
    quality_menu->addActions(quality_group->actions());

    menu_->addAction(tr("Select visualizations..."), selector_, &VisualizationContainer::show);
    menu_->addSeparator();
    menu_->addAction(IconLoader::Load(QStringLiteral("application-exit")), tr("Close visualization"), this, &VisualizationContainer::hide);
    

    // OpenGL
    
    // Create and configure the QSurfaceFormat
    QSurfaceFormat format;
    format.setVersion(3, 3);  // Set OpenGL version to 3.3
    format.setProfile(QSurfaceFormat::CoreProfile);  // Use the core profile
    format.setDepthBufferSize(24);
    format.setStencilBufferSize(8);

    // Initialize the primary OpenGL context
    QOpenGLContext *openGLContext = new QOpenGLContext(this);
    openGLContext->setFormat(format);

    if (!openGLContext->create()) {
        qWarning() << "Failed to create OpenGL context";
    } else {
        qDebug() << "OpenGL context created successfully";
    }

    // Create a new shared context
    QOpenGLContext *sharedContext = new QOpenGLContext(this);
    sharedContext->setFormat(format);

    if (!sharedContext->create()) {
        qWarning() << "Failed to create shared OpenGL context";
    } else {
        qDebug() << "Shared OpenGL context created successfully";
    }

    // Set the shared context
    openGLContext->setShareContext(sharedContext);

    // Create the OpenGL window using the primary OpenGL context
    openGLWindow_ = new VisualizationOpenGLWidget(projectm_visualization_, openGLContext);
    openGLWindow_->setFormat(format);

    // Make the OpenGL context current
    if (!openGLContext->makeCurrent(openGLWindow_)) {
        qWarning() << "Failed to make OpenGL context current";
    }

    // Wrap the QOpenGLWindow in a QWidget container
    glContainer = QWidget::createWindowContainer(openGLWindow_);
    glContainer->setFocusPolicy(Qt::TabFocus);
    glContainer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    glContainer->setParent(this);
    glContainer->setVisible(true);
    setCentralWidget(glContainer);
    projectm_visualization_->Resize(width(), height());

    // Add the overlay as a child of the container and set its visibility
    overlay_->setParent(glContainer);
    overlay_->resize(glContainer->size());  // Resize the overlay to match the container size
    overlay_->setVisible(true);
    overlay_->raise();
}

#ifndef VISUALIZATIONOPENGLWIDGET_H
#define VISUALIZATIONOPENGLWIDGET_H

#include "config.h"

#include <QOpenGLWindow>
#include <QOpenGLFunctions>

class ProjectMVisualization;

class VisualizationOpenGLWidget : public QOpenGLWindow, protected QOpenGLFunctions {
    Q_OBJECT

public:
    explicit VisualizationOpenGLWidget(ProjectMVisualization* projectm_visualization, QOpenGLContext* sharedContext, QWindow* parent = nullptr);

    void initializeGL() override;

protected:
    void paintGL() override;
    void resizeGL(int width, int height) override;

private:
    void Setup(int width, int height);

    ProjectMVisualization* projectm_visualization_;
    QOpenGLContext* sharedContext_;
};

#endif  // VISUALIZATIONOPENGLWIDGET_H

#include "config.h"

#include <QPainter>

#include "core/logging.h"
#include "visualizationopenglwidget.h"
#include "projectmvisualization.h"

VisualizationOpenGLWidget::VisualizationOpenGLWidget(ProjectMVisualization* projectm_visualization, QOpenGLContext* sharedContext, QWindow* parent)
    : QOpenGLWindow(NoPartialUpdate, parent),
      projectm_visualization_(projectm_visualization),
      sharedContext_(sharedContext) {
    setFormat(sharedContext_->format());
}

void VisualizationOpenGLWidget::initializeGL() {
    QOpenGLWindow::initializeGL();
    sharedContext_->makeCurrent(this);
    initializeOpenGLFunctions();
    projectm_visualization_->Init();
}

void VisualizationOpenGLWidget::paintGL() {
    sharedContext_->makeCurrent(this);

    QPainter p(this);
    p.beginNativePainting();
    
    if (projectm_visualization_) {
        Setup(width(), height());
        projectm_visualization_->RenderFrame(width(), height());
    }
    
    update();

    p.endNativePainting();

    GLenum error = glGetError();
    if (error != GL_NO_ERROR) {
        qWarning() << "OpenGL error in paintGL:" << error;
    }

    qLog(Debug) << __PRETTY_FUNCTION__ << "Completed";
}

void VisualizationOpenGLWidget::resizeGL(int width, int height) {
    sharedContext_->makeCurrent(this);

    Setup(width, height);
    projectm_visualization_->Resize(width, height);

    GLenum error = glGetError();
    if (error != GL_NO_ERROR) {
        qWarning() << "OpenGL error in resizeGL:" << error;
    }
}

void VisualizationOpenGLWidget::Setup(int width, int height) {
    // Ensure the correct OpenGL context is current
    if (!sharedContext_->makeCurrent(this)) {
        qWarning() << "Failed to make OpenGL context current in Setup";
        return;
    }

    // Initialize OpenGL functions
    initializeOpenGLFunctions();

    // Set up OpenGL state
    glShadeModel(GL_SMOOTH);
    glClearColor(0, 0, 0, 0);
    glViewport(0, 0, width, height);
    
    glMatrixMode(GL_TEXTURE);
    glLoadIdentity();
    
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, width, height, 0, -1, 1);  // Set an orthographic projection matrix
    
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    
    glDrawBuffer(GL_BACK);
    glReadBuffer(GL_BACK);
    
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glEnable(GL_LINE_SMOOTH);
    glEnable(GL_POINT_SMOOTH);
    glClearColor(0.0F, 0.0F, 0.0F, 0.0F);
    glLineStipple(2, 0xAAAA);

    GLenum error = glGetError();
    if (error != GL_NO_ERROR) {
        qWarning() << "OpenGL error in Setup:" << error;
    }
}

Gustavo L Conte

https://forum.qt.io/topic/155554/error-code-1282-when-using-opengl-functions-in-qopenglwindow/2

Gustavo L Conte

I'm trying lotsa stuff, using FBO and OpenGLWindow, changing profiles (between versions and compatibility/core), I even made an SDL2 window version. Every time I implement a different way, All result are the same: some presets working and the same majority not working.

But now I've tried bypassing the normal way presets are loaded, and only use this, i.e.

projectm_playlist_add_path(projectm_playlist_instance_, "/home/guzpido/presets-cream-of-the-crop", true, true);

it appears to make a bit more presets to work. this could be a clue. Maybe the way we are loading presets has some issue; but I've banging my head to figure it out if this makes even sense.

Screenshot from 2024-08-04 01-37-12.png

edit: also i cant determine if ConsumeBuffer is working

Gustavo L Conte

I finally understood the mystery of why size_t is accidentally working in ConsumeBuffer: all my FLACs are S24LE, I just tested now one of my own songs which are S16LE and the correct int16 aapproach works for detecting and interacting audio with visuals! Therefore Im trying now to make a ConsumeBuffer with lasers to determine automatically the format and width: (but no luck making S24LE to work)

#include <QtCore/QtEndian>

void VisualizationSDL2::ConsumeBuffer(GstBuffer *buffer, const int pipeline_id, const QString &format) {
    Q_UNUSED(pipeline_id);

    GstMapInfo map;
    gst_buffer_map(buffer, &map, GST_MAP_READ);

    if (projectm_instance_) {
        unsigned int sample_count = 0;
        const int16_t *int16_data = nullptr;
        const float *float_data = nullptr;

        if (format == QStringLiteral("S16LE") || format == QStringLiteral("S16BE")) {
            sample_count = map.size / sizeof(int16_t) / 2;
            int16_data = reinterpret_cast<const int16_t *>(map.data);
            if (format == QStringLiteral("S16BE")) {
                // Convert big-endian to little-endian if necessary
                std::vector<int16_t> temp_data(sample_count * 2);
                for (unsigned int i = 0; i < sample_count * 2; ++i) {
                    temp_data[i] = qFromBigEndian(int16_data[i]);
                }
                int16_data = temp_data.data();
            }
            projectm_pcm_add_int16(projectm_instance_, int16_data, sample_count, PROJECTM_STEREO);
        } else if (format == QStringLiteral("F32LE") || format == QStringLiteral("F32BE")) {
            sample_count = map.size / sizeof(float) / 2;
            float_data = reinterpret_cast<const float *>(map.data);
            if (format == QStringLiteral("F32BE")) {
                // Convert big-endian to little-endian if necessary
                std::vector<float> temp_data(sample_count * 2);
                for (unsigned int i = 0; i < sample_count * 2; ++i) {
                    temp_data[i] = qFromBigEndian(float_data[i]);
                }
                float_data = temp_data.data();
            }
            projectm_pcm_add_float(projectm_instance_, float_data, sample_count, PROJECTM_STEREO);
        } else if (format == QStringLiteral("S24LE")) {
            // Handle 24-bit audio (3 bytes per sample)
            sample_count = map.size / 3 / 2;
            std::vector<int16_t> int16_samples(sample_count * 2);
            for (unsigned int i = 0; i < sample_count * 2; ++i) {
                int16_samples[i] = static_cast<int16_t>((map.data[i * 3 + 2] << 8) | map.data[i * 3 + 1]);
            }
            projectm_pcm_add_int16(projectm_instance_, int16_samples.data(), sample_count, PROJECTM_STEREO);
        }

        gst_buffer_unmap(buffer, &map);
    }

    gst_buffer_unref(buffer);
}