Decodes 10-bit 4:2:2 YCbCr packed in v210 (SMPTE ST 2110-20 / SDI native). More...
Detailed Description
Decodes 10-bit 4:2:2 YCbCr packed in v210 (SMPTE ST 2110-20 / SDI native).
v210 packs 6 source pixels into 4 little-endian 32-bit words (16 bytes): word 0: Cb01 (10b) | Y0 (10b) | Cr01 (10b) | 2b pad word 1: Y1 (10b) | Cb23 (10b) | Y2 (10b) | 2b pad word 2: Cr23 (10b) | Y3 (10b) | Cb45 (10b) | 2b pad word 3: Y4 (10b) | Cr45 (10b) | Y5 (10b) | 2b pad
Inverse of V210Encoder. The input texture is RGBA8 at ((width/6)*4) × height — each RGBA8 texel is one v210 ULWord, byte-for-byte. For the AJA capture path, that's exactly what DVP DMAs from sysmem to GPU.
Width must be a multiple of 6 (and is in practice always a multiple of 48 for SDI: 1920, 3840, 7680). Non-aligned widths would need row padding, which we don't bother with — SDI doesn't produce them.
Output: full-width RGB. The fragment shader extracts the 10-bit Y/Cb/Cr fields, normalizes to [0, 1] (10-bit limited range maps to roughly the same [16/255, 235/255] window as 8-bit limited), then runs the standard score colorMatrix() convert_to_rgb. SDR/BT.709 by default; HDR (BT.2020 PQ/HLG) routes through bt2020shader() the same way as any other 10-bit YUV input.
Public Member Functions | |
| V210Decoder (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 | |
| 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 |
| bool | hasFrame {} |
| bool | failed {} |
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()
|
inlineoverridevirtual |
Decode and upload a video frame to the GPU.
Implements score::gfx::GPUVideoDecoder.
◆ init()
|
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.
The documentation for this struct was generated from the following file: