ffjpeg | simple jpeg encoding and decoding implemention | Runtime Evironment library

by rockcarry C Version: Current License: GPL-3.0

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | ffjpeg Summary

ffjpeg is a C library typically used in Server, Runtime Evironment applications. ffjpeg has no bugs, it has a Strong Copyleft License and it has low support. However ffjpeg has 12 vulnerabilities. You can download it from GitHub.

ffjpeg is a simple jpeg encoding and decoding implemention. jpeg is the most popular image compress standard. for most people, it’s just a .jpg picture, but for me and other software engineer, we want to understand how dose it working, how to compress image into jpeg format, and how to display a jpeg file on screen. after studying related courses at university, maybe everyone known what’s jpeg. many documents and books, also tell you how to do jpeg encoding or decoding, and how data are stored in jpeg files. but the most important thing is how to write code, how to debug, and finally make a correct code by your self, to decode and display a jpeg file on the screen. it’s interesting but challenging. maybe some one will say,

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Support

ffjpeg has a low active ecosystem.

It has 58 star(s) with 29 fork(s). There are 3 watchers for this library.

It had no major release in the last 6 months.

There are 15 open issues and 24 have been closed. On average issues are closed in 58 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of ffjpeg is current.

Quality

ffjpeg has 0 bugs and 0 code smells.

Security

ffjpeg has 12 vulnerability issues reported (0 critical, 0 high, 12 medium, 0 low).

ffjpeg code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

ffjpeg is licensed under the GPL-3.0 License. This license is Strong Copyleft.

Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

Reuse

ffjpeg releases are not available. You will need to build from source code and install.

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ffjpeg Key Features

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ffjpeg Examples and Code Snippets

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Community Discussions

Trending Discussions on ffjpeg

JPEG category encode bitwise operation

Can integer operations (eg addition or subtraction) be performed on malloc buffers?

QUESTION

JPEG category encode bitwise operation

Asked 2020-May-29 at 21:38

In the Cryx note about JPEG compression, categories are described as "the minimum size in bits in which we can keep that value". It goes on to say that values falling within certain ranges are put into categories. I have pasted a segment below but not the whole table.

...

ANSWER

Answered 2020-May-29 at 21:38

while here is used to find the most significant bit in code. Or in other words - length of code in bits.

The loop consequently applies mask to get next bit in code. First, mask is 1000000000000000 in binary form with 1 in 15th bit (zero based), the most valued bit in 2-byte (16 bit) number. Operator & (binary AND) zeros all bits in absc except one with 1 in mask. If result is zero than shift mask right (remove last binary digit) and repeat with next bit.

For value 6 = 110b (binary form) while will work till mask = 100b and i = 2. After it size will be set to 3.

If code was negative than the last line will convert it in one’s compliment representation with size length. Such encoding of negative numbers is described in your categories list.

Source https://stackoverflow.com/questions/62094171

QUESTION

Can integer operations (eg addition or subtraction) be performed on malloc buffers?

Asked 2020-May-23 at 15:58

To learn about JPEG compression, I downloaded a simple BMP/JPEG encoder that I have been examining. I have several questions, hopefully someone can help me with. I'm not a trained computer scientist, just a hobby programmer. Grateful for any help.

The following code reads a bitmap, I left some information out for brevity. I understand that a bitmap header is written as a struct, so the components can be read directly to variables without iterating.

BYTE is a typedef for uint8_t

...

ANSWER

Answered 2020-May-23 at 15:55

This is reading data from the file file into the buffer pb->pdata, in chunks of size pb->stride, in reverse order. The number of chunks is pb->height.

The pointer pdata is used to indicate where the next chunk is to be placed in the buffer. Since the total size of the buffer is pb->stride * pb->height, the line

Source https://stackoverflow.com/questions/61974470

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install ffjpeg

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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