Fallback hardware decoder that transfers HW frames to CPU via av_hwframe_transfer_data(), then delegates to a software GPU decoder. More...

Inheritance diagram for score::gfx::HWTransferDecoder:

Detailed Description

Fallback hardware decoder that transfers HW frames to CPU via av_hwframe_transfer_data(), then delegates to a software GPU decoder.

This avoids the software decode cost (GPU-accelerated decode) while still uploading pixel data through the normal QRhi texture upload path. The transfer is a GPU→CPU DMA copy, typically yielding NV12 or P010 data.

This is the fallback used when zero-copy import is not available for the current RHI backend / HW decoder combination.

Public Member Functions
	HWTransferDecoder (Video::ImageFormat &d, AVPixelFormat swFormat=AV_PIX_FMT_NV12)

std::unique_ptr< GPUVideoDecoder >	createDelegateForFormat (AVPixelFormat fmt)

std::pair< QShader, QShader >	init (RenderList &r) override
	Initialize a GPUVideoDecoder.

void	exec (RenderList &r, QRhiResourceUpdateBatch &res, AVFrame &frame) override
	Decode and upload a video frame to the GPU.

Public Member Functions inherited from score::gfx::GPUVideoDecoder
void	release (RenderList &)
	This method will release all the created samplers and textures.

Static Public Member Functions
static bool	canDelegateFormat (AVPixelFormat fmt)

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

AVPixelFormat	m_swFormat {AV_PIX_FMT_NONE}

std::unique_ptr< GPUVideoDecoder >	m_delegate

AVFrame *	m_swFrame {}

Public Attributes inherited from score::gfx::GPUVideoDecoder
std::vector< Sampler >	samplers

bool	hasFrame {}

bool	failed {}