# The number of bytes is the data type of "pixel"?

I'm relatively new to use Pixel Bender to process audio data, so I'm sorry for my lack of understanding of what follows.

I had a question about the data types 'pixel' and 'image' Pixel Bender.

I'm trying to understand code Kevin Goldsmith has written for his mixer 2 channels of audio and there seems to be a gap between the amount of data sent to the shader of PB, and the amount received when the buffer is sent to her for treatment.

Here is the link to the code:

At the top of the code, it says a "BUFFER" of 2048 constant:

private public static var Buffer_size : uint = 0 x 800;

Then, in the processSound() function, he implemented an byteArray with a size of 16 384 bytes:

shaderBuffer. length = BUFFER_SIZE * 2 * 4;     <---(échantillons stéréo 2048 * 2 * 4 octets/échantillon)

However, I am confused about the part where it defines a hypothetical image and sends the data to the shader:

effectShader. data ["source"] . width = BUFFER_SIZE / 1024;     <---(2048 / 1024 = 2)

effectShader. data ["source"] . height = 512 ;

From the code above, one can easily see that the size of the image is only 1024 "pixel" (2 * 512), and on the receiving end there is a "image.4" of variable entry expected to receive.  So far, I was under the assumption that a data type "image4" consists of a variable amount of pixels (determined by the size of the image that is food inside), each composed of 4 layers of color of 1 byte.  In this logic, each pixel in a data type "image4" should consist of 4 bytes.  Now, let's do the math: 4 bytes * 1024 pixels = 4096.

4096 is not equal to 16 384!

How can feed you a 16 384 'byteArray' bytes in a variable "image4" of 4096 bytes?

I'm sorry to seem presumptuous to the explanation above, but I can not understand what is happening here!

The number of bytes is a 'pixel' in PB?  He holds float or integer values or both?

I've scoured the web to find these answers, but nothing helps!  Maybe I'm off the mark with my current understanding of the pixels and images in PB, but I need to understand this before I can move with the application that I do.

I am very grateful of any advice or information that someone can give.

Thank you

Matt

This is the Pixel Bender Language Reference:

"pixel1: represents the value of a single channel of an image." The name distinguishes this
single element pixel of a pixel which contains several channels. The pixel values are
considered as 32-bit floating-point numbers. »

32 bits = 4 bytes

If a channel is four bytes rather than that you have accessed. If this should explain the difference.

Tags: Pixel Bender

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