Comments (7)
Currently I don't provide ContentLength
as Stream.Length
but this might be relatively easy thing to do (not trivial though, as it is expected to be available right after construction, so reading of inner file would need to happen before reading lz4 stream, kind of non-obvious side effect).
Once you have frame length you could use https://github.com/Microsoft/Microsoft.IO.RecyclableMemoryStream.
I know it is still not ideal, but much more plausible in short term.
from k4os.compression.lz4.
In version 1.0.2 you can now read content length (if compressed with content length).
from k4os.compression.lz4.
1.3.0-beta has a lot of new streaming methods and some of them are very memory friendly, let's say.
from k4os.compression.lz4.
Isn't LZ4Pickler.Pickle
and LZ4Pickler.Unpickle
do (almost) exactly that?
from k4os.compression.lz4.
@MiloszKrajewski do Pickle and Unpickle handle Frames?
What I am trying to do is to read and play ROS-Bag files... they're essentially video files, where every frame can be compressed using LZ4 or BZ2... I usually need to decompress between 60 and 90 images per second, so I'm trying to avoid any unnecesary byte copy. I am also using ArrayPool to reuse buffers.
from k4os.compression.lz4.
That's fair. From what I've seen every frame is ROS bag file is a mini LZ4Stream. I guess all the magic is in https://github.com/ros/ros_comm/blob/melodic-devel/utilities/roslz4/src/lz4s.c but it also seems to me like customized lz4 implementation so I'm not exactly sure if it would be easy to implement.
I understand LZ4Stream.Decode(new MemoryStream(lz4bytes)).ReadToEnd()
is what you need but with less memory allocations?
from k4os.compression.lz4.
I understand LZ4Stream.Decode(new MemoryStream(lz4bytes)).ReadToEnd() is what you need but with less memory allocations?
Exactly. Right now it's what I am using, and it's decoding the LZ4 miniblocks just fine.
But in order to improve performance, any memory reallocation is a bottleneck. I am using Spans, ArraySegments and ArrayPools everywhere...
I also would like to try with realtime recording/encoding; right now I am recording raw frames at 500mb/second throughput, and it's already at the limit. So my plan is that if realtime encoding is not fast enough, I would do it in a post process pass.
from k4os.compression.lz4.
Related Issues (20)
- h264 nal unit invalid HOT 2
- Implicit reference to System.Runtime.CompilerServices.Unsafe appears to cause wrong version to be selected HOT 3
- Chained encoder does not produce the same result as the lz4 cli when chaining is enabled HOT 4
- Migrating from L4zNet to new implementation
- InvalidDataException: LZ4 frame magic number expected HOT 10
- Implement frame format with K4os.Compression.LZ4 HOT 2
- Question about random access, i want to make something similar to the original dictionaryRandoimAccess.c example HOT 5
- why Length return 7 HOT 1
- Question regarding Lz4net archived repo HOT 6
- LZ4 Legacy format support HOT 2
- LZ4EncoderStream Dispose Issue HOT 3
- Compression Issue? HOT 3
- API: LZ4Codec.Decode/Encode(Stream input, Stream output) HOT 12
- LZ4 with Maui HOT 7
- Stream API CopyTo got NotSupportedException HOT 4
- LZ4DecoderStream ReadAsync calls original stream's sync Read internally HOT 2
- [Question] Block vs Stream vs Pickler to store compressed bitmaps in memory HOT 10
- Adding non compressed data at the end of the stream HOT 2
- The `int LZ4Frame#Encode` overloads don't close the frame HOT 2
- The repository contains the code with the incompatible licenses HOT 3
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from k4os.compression.lz4.