FxGfx2Video.ino

This sketch is fully compatible with the FastLED web compiler.

This sketch is fully compatible with the FastLED web compiler. To use it do the following:

1. Install Fastled: pip install fastled
2. cd into this examples page.
3. Run the FastLED web compiler at root: fastled
4. When the compiler is done a web page will open.

The render pattern is alternating black/red pixels as a checkerboard. Demonstrates drawing to a frame buffer, which is used as source video for the memory player.

// @filter: (memory is large)

 
#include <FastLED.h>
#include "fl/stl/detail/memory_file_handle.h"
#include "fl/fx/fx_engine.h"
#include "fl/stl/memory.h"
#include "fl/fx/video.h"
#include "fl/log/log.h"
 
#define LED_PIN 2
#define BRIGHTNESS 96
#define LED_TYPE WS2811
#define COLOR_ORDER GRB
 
#define MATRIX_WIDTH 22
#define MATRIX_HEIGHT 22
#define NUM_LEDS (MATRIX_WIDTH * MATRIX_HEIGHT)
 
fl::CRGB leds[NUM_LEDS];
 
const int BYTES_PER_FRAME = 3 * NUM_LEDS;
const int NUM_FRAMES = 2;
const uint32_t BUFFER_SIZE = BYTES_PER_FRAME * NUM_FRAMES;
 
fl::memorybufPtr memoryStream;
fl::FxEngine fxEngine(NUM_LEDS);
// Create and initialize Video object
fl::XYMap xymap(MATRIX_WIDTH, MATRIX_HEIGHT);
fl::Video video(NUM_LEDS, 2.0f);
 
void write_one_frame(fl::memorybufPtr memoryStream) {
    //memoryStream->seek(0);  // Reset to the beginning of the stream
    uint32_t total_bytes_written = 0;
    bool toggle = (fl::millis() / 500) % 2 == 0;
    FL_DBG("Writing frame data, toggle = " << toggle);
    for (uint32_t i = 0; i < NUM_LEDS; ++i) {
        fl::CRGB color = (toggle ^ i%2) ? fl::CRGB::Black : fl::CRGB::Red;
        size_t bytes_written = memoryStream->writeCRGB(&color, 1);
        if (bytes_written != 1) {
            FL_DBG("Failed to write frame data, wrote " << bytes_written << " bytes");
            break;
        }
        total_bytes_written += bytes_written;
    }
    if (total_bytes_written) {
        FL_DBG("Frame written, total bytes: " << total_bytes_written);
    }
}
 
void setup() {
    delay(1000); // sanity delay
    FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS)
        .setCorrection(TypicalLEDStrip)
        .setScreenMap(xymap);
    FastLED.setBrightness(BRIGHTNESS);
 
    // Create memory-backed file handle for streaming video
    memoryStream = fl::make_shared<fl::memorybuf>(BUFFER_SIZE*sizeof(fl::CRGB));
 
    video.begin(memoryStream);
    // Add the video effect to the FxEngine
    fxEngine.addFx(video);
}
 
void loop() {
    EVERY_N_MILLISECONDS(500) {
        write_one_frame(memoryStream);  // Write next frame data
    }
    // write_one_frame(memoryStream);  // Write next frame data
    // Draw the frame
    fxEngine.draw(fl::millis(), leds);
    // Show the LEDs
    FastLED.show();
    delay(20); // Adjust this delay to control frame rate
}