[Ffmpeg-devel] ac3enc.c modifications

[Michael Niedermayer]

Hi

On Sunday 15 May 2005 23:53, Justin Ruggles wrote:
> Hello,
>
> Simone Karin Lehmann wrote:
> > block switching to a 256 mdct (but this still gives some high
> > frequency artefacts....hmm, why?)
>
> Here is my patch for block switching (with no other modifications).  It
> might produce artefacts as well, but I don't really know what to listen
> for.  The only part of the patch that I'm a bit unsure about whether
> it's 100% correct or not is the transient detection function.  I'd be
> interested to hear any comments/critiques/suggestions.

> -
>      for(i=0;i<(n/2);i++) {
>          alpha = 2 * M_PI * (float)i / (float)n;
>          costab[i] = fix15(cos(alpha));
>          sintab[i] = fix15(sin(alpha));
>      }
> -
>      for(i=0;i<n;i++) {
>          m=0;
>          for(j=0;j<ln;j++) {

cosmetics



> +    dct4(coef_a, in, 8);
> +
> +    int16_t xx[256];
> +    for(i=0; i<128; i++) {

breaks gcc 2.95


[...]
-- 
Michael