Start working on a frame analyzer.

[nageru] / analyzer.cpp

diff --git a/analyzer.cpp b/analyzer.cpp
new file mode 100644 (file)
index 0000000..353229e
--- /dev/null
+++ b/analyzer.cpp
@@ -0,0 +1,145 @@
+#include "analyzer.h"
+
+#include <QDialogButtonBox>
+#include <QSurface>
+
+#include <movit/resource_pool.h>
+#include <movit/util.h>
+
+#include "context.h"
+#include "flags.h"
+#include "mixer.h"
+#include "ui_analyzer.h"
+
+using namespace std;
+
+Analyzer::Analyzer()
+       : ui(new Ui::Analyzer)
+{
+       ui->setupUi(this);
+
+       //connect(ui->button_box, &QDialogButtonBox::accepted, [this]{ this->close(); });
+
+       ui->input_box->addItem("Live", Mixer::OUTPUT_LIVE);
+       ui->input_box->addItem("Preview", Mixer::OUTPUT_PREVIEW);
+       unsigned num_channels = global_mixer->get_num_channels();
+       for (unsigned channel_idx = 0; channel_idx < num_channels; ++channel_idx) {
+               Mixer::Output channel = static_cast<Mixer::Output>(Mixer::OUTPUT_INPUT0 + channel_idx); 
+               string name = global_mixer->get_channel_name(channel);
+               ui->input_box->addItem(QString::fromStdString(name), channel);
+       }
+
+       connect(ui->grab_btn, &QPushButton::clicked, bind(&Analyzer::grab_clicked, this));
+       //ui->display->set_output(Mixer::OUTPUT_LIVE);
+       surface = create_surface(QSurfaceFormat::defaultFormat());
+       context = create_context(surface);
+
+       if (!make_current(context, surface)) {
+               printf("oops\n");
+               exit(1);
+       }
+
+        glGenBuffers(1, &pbo);
+        glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, pbo);
+        glBufferData(GL_PIXEL_PACK_BUFFER_ARB, global_flags.width * global_flags.height * 4, NULL, GL_STREAM_READ);
+}
+
+Analyzer::~Analyzer()
+{
+       if (!make_current(context, surface)) {
+               printf("oops\n");
+               exit(1);
+       }
+       glDeleteBuffers(1, &pbo);
+       check_error();
+       if (resource_pool != nullptr) {
+               resource_pool->clean_context();
+       }
+       delete_context(context);
+       delete surface;  // TODO?
+}
+
+void Analyzer::grab_clicked()
+{
+       Mixer::Output channel = static_cast<Mixer::Output>(ui->input_box->currentData().value<int>());
+
+       if (!make_current(context, surface)) {
+               printf("oops\n");
+               exit(1);
+       }
+
+       Mixer::DisplayFrame frame;
+       if (!global_mixer->get_display_frame(channel, &frame)) {
+               printf("Not ready yet\n");
+               return;
+       }
+
+       // Set up an FBO to render into.
+       if (resource_pool == nullptr) {
+               resource_pool = frame.chain->get_resource_pool();
+       } else {
+               assert(resource_pool == frame.chain->get_resource_pool());
+       }
+       GLuint fbo_tex = resource_pool->create_2d_texture(GL_RGBA8, global_flags.width, global_flags.height);
+       check_error();
+       GLuint fbo = resource_pool->create_fbo(fbo_tex);
+       check_error();
+
+       glWaitSync(frame.ready_fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
+       check_error();
+       frame.setup_chain();
+       check_error();
+       glDisable(GL_FRAMEBUFFER_SRGB);
+       check_error();
+       frame.chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
+       check_error();
+
+       // Read back to memory.
+       glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+       check_error();
+       glBindBuffer(GL_PIXEL_PACK_BUFFER, pbo);
+       check_error();
+       glReadPixels(0, 0, global_flags.width, global_flags.height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, BUFFER_OFFSET(0));
+       check_error();
+
+       unsigned char *buf = (unsigned char *)glMapBuffer(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY);
+       check_error();
+
+       int r_hist[256] = {0}, g_hist[256] = {0}, b_hist[256] = {0};
+       const unsigned char *ptr = buf;
+       for (int y = 0; y < global_flags.width; ++y) {
+               for (int x = 0; x < global_flags.height; ++x) {
+                       uint8_t b = *ptr++;
+                       uint8_t g = *ptr++;
+                       uint8_t r = *ptr++;
+                       uint8_t a = *ptr++;
+
+                       ++r_hist[r];
+                       ++g_hist[g];
+                       ++b_hist[b];
+               }
+       }
+
+       glUnmapBuffer(GL_PIXEL_PACK_BUFFER);
+       check_error();
+       glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
+       check_error();
+       glBindFramebuffer(GL_FRAMEBUFFER, 0);
+       check_error();
+
+       printf("R hist:");
+       for (unsigned i = 0; i < 256; ++i) { printf(" %d", r_hist[i]); }
+       printf("\n");
+       printf("G hist:");
+       for (unsigned i = 0; i < 256; ++i) { printf(" %d", g_hist[i]); }
+       printf("\n");
+       printf("B hist:");
+       for (unsigned i = 0; i < 256; ++i) { printf(" %d", b_hist[i]); }
+       printf("\n");
+
+       resource_pool->release_2d_texture(fbo_tex);
+       check_error();
+       resource_pool->release_fbo(fbo);
+       check_error();
+}
+