Guys, can you analyse this patch.
On Wed, 21 Mar 2018, 10:25 Gagandeep Singh, <deepgagan231...@gmail.com>
wrote:
> decompanding curve or offset were required ticket #6265
> ---
> libavcodec/cfhd.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c
> index a064cd1599..480bf93566 100644
> --- a/libavcodec/cfhd.c
> +++ b/libavcodec/cfhd.c
> @@ -94,6 +94,22 @@ static inline int dequant_and_decompand(int level, int
> quantisation)
> FFSIGN(level) * quantisation;
> }
>
> +static inline void process_alpha(int16_t *alpha, int width)
> +{
> + int alphacompandDCoffset = 256;
> + int alphacompandGain = 9400;
> + int i, channel;
> + for (i = 0; i < width; i++) {
> + channel = alpha[i];
> + channel -= alphacompandDCoffset;
> + channel <<= 3;
> + channel *= alphacompandGain;
> + channel >>= 16;
> + channel = av_clip_uintp2(channel, 12);
> + alpha[i] = channel;
> + }
> +}
> +
> static inline void filter(int16_t *output, ptrdiff_t out_stride,
> int16_t *low, ptrdiff_t low_stride,
> int16_t *high, ptrdiff_t high_stride,
> @@ -792,6 +808,9 @@ static int cfhd_decode(AVCodecContext *avctx, void
> *data, int *got_frame,
> high = s->plane[plane].l_h[7];
> for (i = 0; i < lowpass_height * 2; i++) {
> horiz_filter_clip(dst, low, high, lowpass_width, s->bpc);
> + if (act_plane == 3) {
> + process_alpha(dst, lowpass_width * 2);
> + }
> low += lowpass_width;
> high += lowpass_width;
> dst += pic->linesize[act_plane] / 2;
> --
> 2.14.1
>
>
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