score::gfx::P010Decoder Struct Reference

Decodes P010 videos. More...

Inheritance diagram for score::gfx::P010Decoder:

Detailed Description

Decodes P010 videos.

P010 is a semi-planar 10-bit 4:2:0 format, commonly output by hardware decoders (VAAPI, NVDEC, DXVA2) for 10-bit HEVC/AV1 content.

Layout:

• Plane 0: Y (16-bit per sample, 10 bits used, left-shifted), full resolution
• Plane 1: UV interleaved (16-bit per component), half resolution in both dimensions

Public Member Functions
	P010Decoder (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.
void	setYPixels (QRhiResourceUpdateBatch &res, uint8_t *pixels, int stride) const noexcept
void	setUVPixels (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 const constexpr auto	frag

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.
static QString	vertexShader (bool invertY=false) noexcept

Member Function Documentation

exec()

void score::gfx::P010Decoder::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::P010Decoder::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::P010Decoder::frag

staticconstexpr

Initial value:

= R"_(#version 450
 
)_" SCORE_GFX_VIDEO_UNIFORMS R"_(
 
layout(binding=3) uniform sampler2D y_tex;
layout(binding=4) uniform sampler2D uv_tex;
 
layout(location = 0) in vec2 v_texcoord;
layout(location = 0) out vec4 fragColor;
 
%2
 
vec4 processTexture(vec4 tex) {
  vec4 processed = convert_to_rgb(tex);
  { %1 }
  return processed;
}
 
void main()
{
  // P010 stores 10-bit data in the high bits of 16-bit words,
  // so R16 unorm already returns values normalized to [0, 1].
  float y = texture(y_tex, v_texcoord).r;
  float u = texture(uv_tex, v_texcoord).r;
  float v = texture(uv_tex, v_texcoord).g;
 
  fragColor = processTexture(vec4(y, u, v, 1.));
})_"

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

• P010.hpp