https://github.com/gpuopen-librariesandsdks/brotli_g_sdk

Brotli-G SDK provides an improved lossless compression ratio with GPU decompression support than the standard Brotli compression algorithm maintained by the IETF (also known as RFC7932)
https://github.com/gpuopen-librariesandsdks/brotli_g_sdk

brotli compression gpu web

Last synced: 5 days ago
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Brotli-G SDK provides an improved lossless compression ratio with GPU decompression support than the standard Brotli compression algorithm maintained by the IETF (also known as RFC7932)

• Host: GitHub
• URL: https://github.com/gpuopen-librariesandsdks/brotli_g_sdk
• Owner: GPUOpen-LibrariesAndSDKs
• License: mit
• Created: 2022-11-17T17:23:21.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2024-04-18T14:23:24.000Z (7 months ago)
• Last Synced: 2024-04-19T15:10:51.851Z (7 months ago)
• Topics: brotli, compression, gpu, web
• Language: C++
• Homepage:
• Size: 16 MB
• Stars: 147
• Watchers: 11
• Forks: 10
• Open Issues: 7
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
# Brotli-G SDK

This project contains the specifications and reference implementations for the Brotli-G compression format: 

 

[Brotli-G Bitstream Spec](docs/Brotli_G_Bitstream_Format.pdf)

The use of this technical documentation is goverened by the [License](LICENSE.txt).

# Source

* `src/decoder/BrotliGCompute.hlsl` - start here to read the HLSL source of the GPU decompressor

* `src/decoder/PageDecoder.cpp`     - start here to read the source of the CPU decompressor

* `src/BrotligDecoder.cpp`          - this contains the code driving the CPU decompressor

* `src/encoder/PageEncoder.cpp`     - start here to read the source of the compressor

* `src/BrotligEncoder.cpp`          - entry point for the compressor

## Getting Started

The repo uses CMake build system. Install CMake >= 3.11 if not installed.

## Building

Run "Build.bat" from a Visual Studio Developer Command Prompt to generate build files. Open the build files in compiler of choice and compile. Outputs are static libraries `build\external\brotli\Release\brotli.lib` and `build\Release\brotlig.lib`.

## Usage

To use in a visual studio project, include `inc` `external` and `external\brotli\c\include` as include directories and link `build\external\brotli\Release\brotli.lib` and `build\Release\brotlig.lib` as external libraries.

 

Relevant header files:

* `inc/BrotligEncoder.h` - function declarations for Brotli-G compressor 

* `inc/BrotligDecoder.h` - function declarations for Brotli-G CPU decompressor

* `inc/BrotliG.h`        - Brolti-G API header file for both compressor and CPU decompressor

* `inc/DataStream.h`     - data structures for Brotli-G datastream

Code examples:

```

// Compression

void Compress(size_t srcSize, uint8_t* src, size_t& dstSize, uint8_t*& dst, BrotligDataconditionParams dcParams)

{

    dstSize = BrotliG::MaxCompressedSize(srcSize);

    dst = new uint8_t[dstSize];

	

    size_t actualSize = 0;

	

    BrotliG::Encode(

			srcSize, 		// input size (bytes) 

			src, 			// input data

			&actualSize,		// actual compressed size (bytes) 

			dst, 			// compressed output

			65536,			// page size (bytes)

			dcParams,		// data pre-conditioning parameters

			nullptr			// handle to an application defined progress function

		);

	

    dstSize = actualSize;

}

```

```

// CPU Decompression

void DecompressCPU(size_t srcSize, uint8_t* src, size_t& dstSize, uint8_t*& dst)

{

   dstSize = BrotliG::DecompressedSize(src);

   dst = new uint8_t[dstSize];

   

   size_t actualSize = 0;

	

   BrotliG::DecodeCPU(

			srcSize, 		// compressed size (bytes) 

			src, 			// compressed data

			&actualSize,		// decompressed size (bytes) 

			dst, 			// decompressed output

			nullptr			// handle to an application defined progress function

		);

		

   dstSize = actualSize;

}

```

Example root signature for BrotliGCompute.hlsl:

```

CD3DX12_ROOT_PARAMETER1 rootParameters[RootParametersCount];

rootParameters[RootSRVInput].InitAsShaderResourceView(0);	// Compressed data buffer (SRV input)

rootParameters[RootUAVControl].InitAsUnorderedAccessView(0);	// Compressed data control buffer (UAV input)

rootParameters[RootUAVOutput].InitAsUnorderedAccessView(1);	// Decompressed data buffer (UAV output)

```

## Sample

Source code of a sample demostrating the usage of Brotli-G APIs is provided in the `sample` directory.`Build.bat` builds the sample by default. 

Sample build output `bin\Release\brotlig.exe`. 

Using the sample:

* BrotliG cpu compression:    `brotlig.exe `

* BrotliG cpu deccompression: `brotlig.exe .brotlig`

* BrotliG gpu decompression:  `brotlig.exe -gpu .brotlig`

* Help:                       `brotlig.exe`