On 12/10/15, Ganesh Ajjanagadde <gajjanaga...@gmail.com> wrote:
> cos has symmetry; use this.
>
> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
> ---
> libavcodec/dcaenc.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/dcaenc.c b/libavcodec/dcaenc.c
> index 5a6bdac..6fcfb1a 100644
> --- a/libavcodec/dcaenc.c
> +++ b/libavcodec/dcaenc.c
> @@ -169,8 +169,16 @@ static int encode_init(AVCodecContext *avctx)
> if (!cos_table[0]) {
> int j, k;
>
> - for (i = 0; i < 2048; i++) {
> + cos_table[0] = 0x7fffffff;
> + cos_table[512] = 0;
> + cos_table[1024] = -cos_table[0];
> + for (i = 1; i < 512; i++) {
> cos_table[i] = (int32_t)(0x7fffffff * cos(M_PI * i / 1024));
> + cos_table[1024-i] = -cos_table[i];
> + cos_table[1024+i] = -cos_table[i];
> + cos_table[2048-i] = cos_table[i];
> + }
> + for (i = 0; i < 2048; i++) {
> cb_to_level[i] = (int32_t)(0x7fffffff * pow(10, -0.005 * i));
> }
>
> --
> 2.6.3
Ok, if produced table is same.
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
