score::gfx::YUYV422Decoder Struct Reference

Decodes YUYV422 video. More...

Inheritance diagram for score::gfx::YUYV422Decoder:

Detailed Description

Decodes YUYV422 video.

Core idea taken from https://gist.github.com/roxlu/7872352

Public Member Functions
	YUYV422Decoder (Video::ImageFormat &d)
std::pair< QShader, QShader >	init (RenderList &r) override
	Initialize a GPUVideoDecoder. More...
void	exec (RenderList &, QRhiResourceUpdateBatch &res, AVFrame &frame) override
	Decode and upload a video frame to the GPU.
void	setYPixels (QRhiResourceUpdateBatch &res, uint8_t *pixels, int stride) const noexcept
Public Member Functions inherited from score::gfx::GPUVideoDecoder
void	release (RenderList &)
	This method will release all the created samplers and textures.

Public Attributes
Video::ImageFormat &	decoder
Public Attributes inherited from score::gfx::GPUVideoDecoder
std::vector< Sampler >	samplers

Static Public Attributes
static constexpr const auto	filter

Additional Inherited Members
Static Public Member Functions inherited from score::gfx::GPUVideoDecoder
static QRhiTextureSubresourceUploadDescription	createTextureUpload (uint8_t *pixels, int w, int h, int bytesPerPixel, int stride)
	Utility method to create a QRhiTextureSubresourceUploadDescription. More...
static QString	vertexShader () noexcept

Member Function Documentation

init()

std::pair<QShader, QShader> score::gfx::YUYV422Decoder::init ( RenderList &  r )

inlineoverridevirtual

Initialize a GPUVideoDecoder.

This method must :

• Create samplers and textures for the video format.
• Create shaders that will render the data put into these textures.

It returns a {vertex, fragment} shader pair.

Implements score::gfx::GPUVideoDecoder.

Member Data Documentation

filter

constexpr const auto score::gfx::YUYV422Decoder::filter

staticconstexpr

Initial value:

= R"_(#version 450
 
)_" SCORE_GFX_VIDEO_UNIFORMS R"_(
 
layout(binding=3) uniform sampler2D u_tex;
 
layout(location = 0) in vec2 v_texcoord;
layout(location = 0) out vec4 fragColor;
 
const vec3 R_cf = vec3(1.164383,  0.000000,  1.596027);
const vec3 G_cf = vec3(1.164383, -0.391762, -0.812968);
const vec3 B_cf = vec3(1.164383,  2.017232,  0.000000);
const vec3 offset = vec3(-0.0625, -0.5, -0.5);
 
void main() {
  vec4 tex = texture(u_tex, v_texcoord);
  float y = tex.r;
  float u = tex.g - 0.5;
  float v = tex.a - 0.5;
  fragColor.r = y + 1.13983 * v;
  fragColor.g = y - 0.39465 * u - 0.58060 * v;
  fragColor.b = y + 2.03211 * u;
  fragColor.a = 1.0;
}
)_"

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The documentation for this struct was generated from the following file:

• YUYV422.hpp