CODEWITHSUNDEEP
windowsjpegmpeg
user579480
user579480

Reputation: 135

Hardware JPEG decompression / Win32

I know that most graphics hardware uses MPEG hardware decompression. I would like to use the hardware to decompress JPEG images. Does anyone know of a book or link to any information about using this functionality, or can tell me anything about it?

Also, I am willing to convert the images into a "video" if I can obtain hardware decompression of each frame. Would this be more viable?

Upvotes: 3

Views: 1764

Answers (5)

James Dianics
James Dianics

Reputation: 21

If you are looking for speed and ease, look into using jpegturbo. Its a developed library that I believe is a complete replacement for the standard libjpeg. Compression on 10MP images dropped from 2 seconds to ~.6 seconds on a 2GHZ Atom processor.

Upvotes: 2

onemasse
onemasse

Reputation: 6584

You might want to have a look at OpenMAX, although I don't think it's widely adopted yet.

Upvotes: 0

Guy Sirton
Guy Sirton

Reputation: 8401

Video decompression hardware is special purpose. It takes a video stream that is encoded to a specific standard. You will generally not be able to decode JPEG using MPEG decoding hardware.

Another software option is to use the Intel Integrated Performance Primitives. These are optimized to take advantage of SSE instructions on Intel processors.

As @6502 notes if you convert your JPEG images to a video format (e.g. h.264) there are many ways to use hardware accelerated playback (e.g. DirectShow under Windows). You can do this conversion manually with most video editing software.

Upvotes: 1

9dan
9dan

Reputation: 4282

I don't agree to the "most graphics hardware uses MPEG hardware decompression", at least in the PC or similar desktop environment.

Mostly compression, decompression jobs are done in the main processor (CPU). Graphic hardwares mainly do the post processing of decompressed images.

MPEG decompression hardwares are extincted at least 10 years ago, I think.

Upvotes: 0

6502
6502

Reputation: 114539

Decompression for jpeg using specialized hardware is stuff that's available at the driver level, so it's not easy to do from normal user space. It would be easier to try using generic hardware assisted processing (e.g. CUDA).

However if your need is just having a movie where frames are coming from jpegs then you should check ffmpeg, because it's a tool that can do many things for videos, including this or the opposite (i.e. getting all frames of a video as images).

For example to make a movie using a list of jpeg files (picture1.jpg, picture2.jpg, ...)

ffmpeg -i picture_%d.jpg result.wmv

Most video players will then use hardware acceleration during playback if that is available

Upvotes: 2

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