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swscale: reintroduce full precision in 16-bit output.

This commit is contained in:
Ronald S. Bultje 2011-10-05 06:27:52 -07:00
parent ff7913aef1
commit f99654d470
8 changed files with 39 additions and 33 deletions
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16
libswscale/swscale.c
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@ -202,20 +202,26 @@ yuv2yuvX16_c_template(const int16_t *filter, int filterSize,
{
#define output_pixel(pos, val) \
if (big_endian) { \
AV_WB16(pos, av_clip_uint16(val >> shift)); \
AV_WB16(pos, 0x8000 + av_clip_int16(val >> shift)); \
} else { \
AV_WL16(pos, av_clip_uint16(val >> shift)); \
AV_WL16(pos, 0x8000 + av_clip_int16(val >> shift)); \
}
int i;
int shift = 15 + 16 - output_bits - 1;
int shift = 15 + 16 - output_bits;
for (i = 0; i < dstW; i++) {
int val = 1 << (30-output_bits - 1);
int val = 1 << (30-output_bits);
int j;
/* range of val is [0,0x7FFFFFFF], so 31 bits, but with lanczos/spline
* filters (or anything with negative coeffs, the range can be slightly
* wider in both directions. To account for this overflow, we subtract
* a constant so it always fits in the signed range (assuming a
* reasonable filterSize), and re-add that at the end. */
val -= 0x40000000;
for (j = 0; j < filterSize; j++)
val += (src[j][i] * filter[j]) >> 1;
val += src[j][i] * filter[j];
output_pixel(&dest[i], val);
}

8
tests/ref/lavfi/pixdesc
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@ -40,16 +40,16 @@ yuv420p9le 16543fda8f87d94a6cf857d2e8d4461a
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yuva420p a29884f3f3dfe1e00b961bc17bef3d47

8
tests/ref/lavfi/pixfmts_copy
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@ -40,16 +40,16 @@ yuv420p9le 16543fda8f87d94a6cf857d2e8d4461a
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4
tests/ref/lavfi/pixfmts_crop
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@ -33,8 +33,8 @@ yuv422p16be 167e4338811a7d272925a4c6417d60da
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8
tests/ref/lavfi/pixfmts_hflip
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@ -29,12 +29,12 @@ yuv420p 2d5c80f9ba2ddd85b2aeda3564cc7d64
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8
tests/ref/lavfi/pixfmts_null
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@ -40,16 +40,16 @@ yuv420p9le 16543fda8f87d94a6cf857d2e8d4461a
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12
tests/ref/lavfi/pixfmts_scale
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@ -33,23 +33,23 @@ yuv411p 1143e7c5cc28fe0922b051b17733bc4c
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8
tests/ref/lavfi/pixfmts_vflip
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