Codec

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VS1053B

This codec takes a SPI stream of audio, like MP3, and decodes it to an audio output.

Tip

Needed NuGet: GHIElectronics.TinyCLR.Drivers.VlsiSolution.VS1053B

This example plays a small MP3 from a resource. Similarly, large file data can be fetched from other external resources.

//SC13048 Dev Board
var gpio = GpioController.GetDefault();
var dreq = gpio.OpenPin(SC13048.GpioPin.PA4);
var reset = gpio.OpenPin(SC13048.GpioPin.PB15);
var dataChipSelect = gpio.OpenPin(SC13048.GpioPin.PA0);
var commandChipSelect = gpio.OpenPin(SC13048.GpioPin.PB2);
var spi = SpiController.FromName(SC13048.SpiBus.Spi1);

mp3decoder = new VS1053BController(spi, dreq, reset, dataChipSelect, commandChipSelect);
var mp3Bytes = Resources.GetBytes(Resource1.BinaryResources.Song);
mp3decoder.SetVolume(250, 250);
mp3decoder.SendData(mp3Bytes);

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WAV Audio

This code plays an 8 bit mono WAV file with a sample rate of 8 kHz. The WAV file must be saved as a .BIN file before adding it as a resource. The audio is output to pin PA4 on the SC20100S Dev Board.

Tip

Needed NuGet: GHIElectronics.TinyCLR.Drivers.Media

var dac = DacController.GetDefault();
var analogOut = dac.OpenChannel(SC20100.DacChannel.PA4);

var byteFile = Resources.GetBytes
    (Resources.BinaryResources.yourWavFileResource);

var wavFile = new Wav(byteFile);
var dataIndex = wavFile.GetDataIndex();
var size = wavFile.GetDataSize();
var sampleRate = wavFile.GetSampleRate();

if (sampleRate == 8000) {
    for (int i = dataIndex; i < size; i++) {
        analogOut.WriteValue(byteFile[i]);

        for (int timer = 0; timer < 58; timer++) {}
    }
}
else {
    Debug.WriteLine("Sorry, file does not have an 8 kHz sample rate.");
}

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MJPEG Video

The MJPEG video format is simply a chain of JPG images that are stored in a single file. The following code sample demonstrates the use of the driver.

Tip

Needed NuGet: GHIElectronics.TinyCLR.Drivers.Media

var stream = new FileStream($@"A:\128x160.mjpeg", FileMode.Open);

var settings = new Mjpeg.Setting();
settings.BufferSize = 16 * 1024;
settings.BufferCount = 3;

var mjpegDecoder = new Mjpeg(settings);

mjpegDecoder.FrameDecodedEvent += MjpegDecoder_FrameDecodedEvent;

mjpegDecoder.StartDecode(stream); // Non-block function

Thread.Sleep(Timeout.Infinite);

private static void MjpegDecoder_FrameDecodedEvent(byte[] data) {
    using (var image = new Bitmap(data, 0, data.Length,BitmapImageType.Jpeg)){

        if (graphic != null){
            graphic.DrawImage(image, 0, 0, image.Width, image.Height);
            graphic.Flush();
        }
    }
    GC.WaitForPendingFinalizers();// helps in clearing out the RAM
}