On Mon, Sep 05, 2016 at 06:18:42AM -0500, Burt P wrote:
> Signed-off-by: Burt P <pbu...@gmail.com>
> ---
> libavfilter/af_hdcd.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/libavfilter/af_hdcd.c b/libavfilter/af_hdcd.c
> index cde2340..c8bda82 100644
> --- a/libavfilter/af_hdcd.c
> +++ b/libavfilter/af_hdcd.c
> @@ -1316,11 +1316,10 @@ static void hdcd_analyze_prepare(hdcd_state *state,
> int32_t *samples, int count,
> /** encode a value in the given sample by adjusting the amplitude */
> static int32_t hdcd_analyze_gen(int32_t sample, unsigned int v, unsigned int
> maxv)
> {
> - float sflt = sample, vv = v;
> - vv /= maxv;
> - if (vv > 1.0) vv = 1.0;
> - sflt *= 1.0 + (vv * 18);
> - return (int32_t)sflt;
> + static const int r = 18, m = 1024;
> + int64_t s64 = sample;
> + v = m + (v * r * m / maxv);maxv is always a constant (for each call) and division is slow, maybe you want to replace it by multiplication by its inverse and adjust the /m later (that is fast as m is a constant power of 2 in unsigned context) [...[ -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Breaking DRM is a little like attempting to break through a door even though the window is wide open and the only thing in the house is a bunch of things you dont want and which you would get tomorrow for free anyway
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