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swscale: fix gbrap16 alpha channel issues

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Fixes filter-pixfmts-scale test failing on big-endian systems due to
alpSrc not being cast to (const int32_t**).

Also fixes distortions in the output alpha channel values by copying the
alpha channel code from the rgba64 case found elsewhere in output.c.

Fixes ticket 6555.

Signed-off-by: James Cowgill <James.Cowgill@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
James Cowgill
2017-08-03 16:21:54 +01:00
committed by Michael Niedermayer
parent 2cc56741b1
commit 013ec23cbe
2 changed files with 10 additions and 10 deletions
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16
libswscale/output.c
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@@ -2026,24 +2026,24 @@ yuv2gbrp16_full_X_c(SwsContext *c, const int16_t *lumFilter,
const int16_t **lumSrcx, int lumFilterSize,
const int16_t *chrFilter, const int16_t **chrUSrcx,
const int16_t **chrVSrcx, int chrFilterSize,
const int16_t **alpSrc, uint8_t **dest,
const int16_t **alpSrcx, uint8_t **dest,
int dstW, int y)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->dstFormat);
int i;
int hasAlpha = (desc->flags & AV_PIX_FMT_FLAG_ALPHA) && alpSrc;
int hasAlpha = (desc->flags & AV_PIX_FMT_FLAG_ALPHA) && alpSrcx;
uint16_t **dest16 = (uint16_t**)dest;
const int32_t **lumSrc = (const int32_t**)lumSrcx;
const int32_t **chrUSrc = (const int32_t**)chrUSrcx;
const int32_t **chrVSrc = (const int32_t**)chrVSrcx;
int A = 0; // init to silence warning
const int32_t **alpSrc = (const int32_t**)alpSrcx;
for (i = 0; i < dstW; i++) {
int j;
int Y = -0x40000000;
int U = -(128 << 23);
int V = -(128 << 23);
int R, G, B;
int R, G, B, A;
for (j = 0; j < lumFilterSize; j++)
Y += lumSrc[j][i] * (unsigned)lumFilter[j];
@@ -2059,13 +2059,13 @@ yuv2gbrp16_full_X_c(SwsContext *c, const int16_t *lumFilter,
V >>= 14;
if (hasAlpha) {
A = 1 << 18;
A = -0x40000000;
for (j = 0; j < lumFilterSize; j++)
A += alpSrc[j][i] * lumFilter[j];
if (A & 0xF8000000)
A = av_clip_uintp2(A, 27);
A >>= 1;
A += 0x20002000;
}
Y -= c->yuv2rgb_y_offset;
@@ -2083,7 +2083,7 @@ yuv2gbrp16_full_X_c(SwsContext *c, const int16_t *lumFilter,
dest16[1][i] = B >> 14;
dest16[2][i] = R >> 14;
if (hasAlpha)
dest16[3][i] = A >> 11;
dest16[3][i] = av_clip_uintp2(A, 30) >> 14;
}
if ((!isBE(c->dstFormat)) != (!HAVE_BIGENDIAN)) {
for (i = 0; i < dstW; i++) {