score::gfx::R210Decoder Struct Reference

Decodes 10-bit RGB packed in r210 (DeckLink bmdFormat10BitRGB). More...

Inheritance diagram for score::gfx::R210Decoder:

Detailed Description

Decodes 10-bit RGB packed in r210 (DeckLink bmdFormat10BitRGB).

One pixel per 32-bit BIG-ENDIAN word: (R << 20) | (G << 10) | B, full-scale 0-1023 — the exact inverse of PackedRGBEncoder::r210be(). Rows are padded to 256-byte multiples (((width + 63) / 64) * 256), so the input texture is sized on the padded stride and indexed 1 texel : 1 pixel (padding sits past the visible width).

Public Member Functions
	R210Decoder (Video::ImageFormat &d)
std::pair< QShader, QShader >	init (RenderList &r) override
	Initialize a GPUVideoDecoder.
void	exec (RenderList &, QRhiResourceUpdateBatch &res, AVFrame &frame) override
	Decode and upload a video frame to the GPU.
Public Member Functions inherited from score::gfx::GPUVideoDecoder
virtual void	release (RenderList &)
	This method will release all the created samplers and textures.

Static Public Member Functions
static constexpr int	rowBytesFor (int w) noexcept
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.
static QString	vertexShader (bool invertY=false) noexcept

Public Attributes
Video::ImageFormat &	decoder
Public Attributes inherited from score::gfx::GPUVideoDecoder
std::vector< Sampler >	samplers
bool	hasFrame {}
bool	failed {}
bool	formatChanged {}

Static Public Attributes
static const constexpr auto	frag

Member Function Documentation

exec()

void score::gfx::R210Decoder::exec ( RenderList &  , QRhiResourceUpdateBatch &  res, AVFrame &  frame  )

inlineoverridevirtual

Decode and upload a video frame to the GPU.

Implements score::gfx::GPUVideoDecoder.

init()

std::pair< QShader, QShader > score::gfx::R210Decoder::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

frag

const constexpr auto score::gfx::R210Decoder::frag

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;
 
vec4 processTexture(vec4 tex) {
  vec4 processed = tex;
  { %1 }
  return processed;
}
 
void main() {
  int x = int(floor(v_texcoord.x * mat.texSz.x));
  int y = int(floor(v_texcoord.y * mat.texSz.y));
  vec4 t = texelFetch(u_tex, ivec2(x, y), 0);
  uint b0 = uint(t.r * 255.0 + 0.5);
  uint b1 = uint(t.g * 255.0 + 0.5);
  uint b2 = uint(t.b * 255.0 + 0.5);
  uint b3 = uint(t.a * 255.0 + 0.5);
  uint w = (b0 << 24u) | (b1 << 16u) | (b2 << 8u) | b3; // big-endian word
  float r = float((w >> 20u) & 0x3FFu);
  float g = float((w >> 10u) & 0x3FFu);
  float b = float( w         & 0x3FFu);
  fragColor = processTexture(vec4(r, g, b, 1023.0) / 1023.0);
}
)_"

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

• R210.hpp