The Ogg container format is being promoted by the Xiph Foundation for use with its Vorbis and Theora codecs. Unfortunately, a number of technical shortcomings in the format render it ill-suited to most, if not all, use cases. This article examines the most severe of these flaws.
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It has come to my attention that this blog suffers a complete lack of the single most important thing on the Internet: cat pictures. Here is a feeble attempt to remedy this most shocking of shortfalls.
Earlier this month the IJG unleashed version 8 of its ubiquitous libjpeg library on the world. Eager to try out the “major breakthrough in image coding technology” promised in the README file accompanying v7, I downloaded the release. A glance at the README file suggests something major indeed is afoot:
Version 8.0 is the first release of a new generation JPEG standard to overcome the limitations of the original JPEG specification.
The text also hints at the existence of a document detailing these marvellous new features, and a Google search later a copy has found its way onto my monitor. As I read, however, my state of mind shifts from an initial excited curiosity, through bewilderment and disbelief, finally arriving at pure merriment.
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Consider the following C code which is based on an real-world situation.
struct bf1_31 {
unsigned a:1;
unsigned b:31;
};
void func(struct bf1_31 *p, int n, int a)
{
int i = 0;
do {
if (p[i].a)
p[i].b += a;
} while (++i < n);
}
How would we best write this in ARM assembler? This is how I would do it:
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