score::gfx::YUV422Decoder Struct Reference

Decodes YUV422 videos. More...

Inheritance diagram for score::gfx::YUV422Decoder:

Detailed Description

Decodes YUV422 videos.

Adapted from YUV420 Roxlu code and softpixel.com/~cwright/programming/colorspace/yuv

Public Member Functions
	YUV422Decoder (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
void	setUPixels (QRhiResourceUpdateBatch &res, uint8_t *pixels, int stride) const noexcept
void	setVPixels (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	yuv422_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::YUV422Decoder::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

yuv422_filter

constexpr const auto score::gfx::YUV422Decoder::yuv422_filter

staticconstexpr

Initial value:

= R"_(#version 450
 
)_" SCORE_GFX_VIDEO_UNIFORMS R"_(
 
layout(binding=3) uniform sampler2D y_tex;
layout(binding=4) uniform sampler2D u_tex;
layout(binding=5) uniform sampler2D v_tex;
 
layout(location = 0) in vec2 v_texcoord;
layout(location = 0) out vec4 fragColor;
 
// See softpixel.com/~cwright/programming/colorspace/yuv
const vec3 offset = vec3(0., -0.5, -0.5);
const mat3 coeff = mat3(1.0   ,  1.0   , 1.0,
                        0.0   , -0.3455, 1.7790,
                        1.4075, -0.7169, 0.);
void main()
{
    float y = texture(y_tex, v_texcoord).r;
    float u = texture(u_tex, v_texcoord).r;
    float v = texture(v_tex, v_texcoord).r;
 
    fragColor = vec4(coeff * (vec3(y,u,v) + offset), 1);
}
)_"

---

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

• YUV422.hpp