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author | Timothy Gu <timothygu99@gmail.com> | 2015-11-01 10:20:58 -0800 |
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committer | Timothy Gu <timothygu99@gmail.com> | 2015-11-01 18:52:50 -0800 |
commit | dee74405312a13a96ae8259221a79a0e78ea7789 (patch) | |
tree | 0767516da02b63685912877dda1b00fd6c8e15bb /libavfilter/vf_boxblur.c | |
parent | c03044c86ad86e244e85c7f0b7c6fd54c432e74d (diff) | |
download | ffmpeg-streaming-dee74405312a13a96ae8259221a79a0e78ea7789.zip ffmpeg-streaming-dee74405312a13a96ae8259221a79a0e78ea7789.tar.gz |
vf_boxblur: Templatize blur{8,16}
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavfilter/vf_boxblur.c')
-rw-r--r-- | libavfilter/vf_boxblur.c | 110 |
1 files changed, 44 insertions, 66 deletions
diff --git a/libavfilter/vf_boxblur.c b/libavfilter/vf_boxblur.c index ef01cf9..6934076 100644 --- a/libavfilter/vf_boxblur.c +++ b/libavfilter/vf_boxblur.c @@ -204,75 +204,53 @@ static int config_input(AVFilterLink *inlink) return 0; } -static inline void blur8(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, - int len, int radius) -{ - /* Naive boxblur would sum source pixels from x-radius .. x+radius - * for destination pixel x. That would be O(radius*width). - * If you now look at what source pixels represent 2 consecutive - * output pixels, then you see they are almost identical and only - * differ by 2 pixels, like: - * src0 111111111 - * dst0 1 - * src1 111111111 - * dst1 1 - * src0-src1 1 -1 - * so when you know one output pixel you can find the next by just adding - * and subtracting 1 input pixel. - * The following code adopts this faster variant. - */ - const int length = radius*2 + 1; - const int inv = ((1<<16) + length/2)/length; - int x, sum = src[radius*src_step]; - - for (x = 0; x < radius; x++) - sum += src[x*src_step]<<1; - - sum = sum*inv + (1<<15); - - for (x = 0; x <= radius; x++) { - sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv; - dst[x*dst_step] = sum>>16; - } - - for (; x < len-radius; x++) { - sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; - dst[x*dst_step] = sum >>16; - } - - for (; x < len; x++) { - sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; - dst[x*dst_step] = sum>>16; - } +/* Naive boxblur would sum source pixels from x-radius .. x+radius + * for destination pixel x. That would be O(radius*width). + * If you now look at what source pixels represent 2 consecutive + * output pixels, then you see they are almost identical and only + * differ by 2 pixels, like: + * src0 111111111 + * dst0 1 + * src1 111111111 + * dst1 1 + * src0-src1 1 -1 + * so when you know one output pixel you can find the next by just adding + * and subtracting 1 input pixel. + * The following code adopts this faster variant. + */ +#define BLUR(type, depth) \ +static inline void blur ## depth(type *dst, int dst_step, const type *src, \ + int src_step, int len, int radius) \ +{ \ + const int length = radius*2 + 1; \ + const int inv = ((1<<16) + length/2)/length; \ + int x, sum = src[radius*src_step]; \ + \ + for (x = 0; x < radius; x++) \ + sum += src[x*src_step]<<1; \ + \ + sum = sum*inv + (1<<15); \ + \ + for (x = 0; x <= radius; x++) { \ + sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv; \ + dst[x*dst_step] = sum>>16; \ + } \ + \ + for (; x < len-radius; x++) { \ + sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; \ + dst[x*dst_step] = sum >>16; \ + } \ + \ + for (; x < len; x++) { \ + sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; \ + dst[x*dst_step] = sum>>16; \ + } \ } -static inline void blur16(uint16_t *dst, int dst_step, const uint16_t *src, int src_step, - int len, int radius) -{ - const int length = radius*2 + 1; - const int inv = ((1<<16) + length/2)/length; - int x, sum = src[radius*src_step]; - - for (x = 0; x < radius; x++) - sum += src[x*src_step]<<1; - - sum = sum*inv + (1<<15); - - for (x = 0; x <= radius; x++) { - sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv; - dst[x*dst_step] = sum>>16; - } - - for (; x < len-radius; x++) { - sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; - dst[x*dst_step] = sum >>16; - } +BLUR(uint8_t, 8) +BLUR(uint16_t, 16) - for (; x < len; x++) { - sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; - dst[x*dst_step] = sum>>16; - } -} +#undef BLUR static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, int len, int radius, int pixsize) |