On Sat, Oct 20, 2012 at 08:47:47AM -0400, Justin Ruggles wrote:
> ---
> libavcodec/atrac3.c | 17 +++++++----------
> 1 files changed, 7 insertions(+), 10 deletions(-)
>
> diff --git a/libavcodec/atrac3.c b/libavcodec/atrac3.c
> index 9e0f273..76e251b 100644
> --- a/libavcodec/atrac3.c
> +++ b/libavcodec/atrac3.c
> @@ -177,19 +177,16 @@ static int decode_bytes(const uint8_t *input, uint8_t
> *out, int bytes)
>
> static av_cold void init_atrac3_window(void)
> {
> - float enc_window[256];
> - int i;
> + int i, j;
>
> /* generate the mdct window, for details see
> * http://wiki.multimedia.cx/index.php?title=RealAudio_atrc#Windows */
> - for (i = 0; i < 256; i++)
> - enc_window[i] = (sin(((i + 0.5) / 256.0 - 0.5) * M_PI) + 1.0) * 0.5;
> -
> - for (i = 0; i < 256; i++) {
> - mdct_window[i] = enc_window[i] /
> - (enc_window[ i] * enc_window[ i] +
> - enc_window[255 - i] * enc_window[255 - i]);
> - mdct_window[511 - i] = mdct_window[i];
> + for (i = 0, j = 255; i < 128; i++, j--) {
> + float wi = sin(((i + 0.5) / 256.0 - 0.5) * M_PI) + 1.0;
> + float wj = sin(((j + 0.5) / 256.0 - 0.5) * M_PI) + 1.0;
> + float w = 0.5 * (wi * wi + wj * wj);
> + mdct_window[i] = mdct_window[511 - i] = wi / w;
> + mdct_window[j] = mdct_window[511 - j] = wj / w;
> }
> }
>
> --
LGTM
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