Decodes YUV422 videos. More...

Inheritance diagram for score::gfx::YUV422Decoder:
score::gfx::GPUVideoDecoder

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::ImageFormatdecoder
 
- Public Attributes inherited from score::gfx::GPUVideoDecoder
std::vector< Samplersamplers
 

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: