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swscale: add nv24/nv42 to yuv420p unscaled converter

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This commit is contained in:
Ramiro Polla 2024-08-09 13:26:09 +02:00
parent aa14f9fe63
commit 4eb5594295
1 changed files with 45 additions and 0 deletions
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45
libswscale/swscale_unscaled.c
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@ -221,6 +221,48 @@ static int nv24ToPlanarWrapper(SwsContext *c, const uint8_t *src[],
return srcSliceH;
}
static void nv24_to_yuv420p_chroma(uint8_t *dst1, int dstStride1,
uint8_t *dst2, int dstStride2,
const uint8_t *src, int srcStride,
int w, int h)
{
const uint8_t *src1 = src;
const uint8_t *src2 = src + srcStride;
// average 4 pixels into 1 (interleaved U and V)
for (int y = 0; y < h; y += 2) {
for (int x = 0; x < w; x++) {
dst1[x] = (src1[4 * x + 0] + src1[4 * x + 2] +
src2[4 * x + 0] + src2[4 * x + 2]) >> 2;
dst2[x] = (src1[4 * x + 1] + src1[4 * x + 3] +
src2[4 * x + 1] + src2[4 * x + 3]) >> 2;
}
src1 += srcStride * 2;
src2 += srcStride * 2;
dst1 += dstStride1;
dst2 += dstStride2;
}
}
static int nv24ToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
int srcStride[], int srcSliceY, int srcSliceH,
uint8_t *dstParam[], int dstStride[])
{
uint8_t *dst1 = dstParam[1] + dstStride[1] * srcSliceY / 2;
uint8_t *dst2 = dstParam[2] + dstStride[2] * srcSliceY / 2;
copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
dstParam[0], dstStride[0]);
if (c->srcFormat == AV_PIX_FMT_NV24)
nv24_to_yuv420p_chroma(dst1, dstStride[1], dst2, dstStride[2],
src[1], srcStride[1], c->srcW / 2, srcSliceH);
else
nv24_to_yuv420p_chroma(dst2, dstStride[2], dst1, dstStride[1],
src[1], srcStride[1], c->srcW / 2, srcSliceH);
return srcSliceH;
}
static int planarToP01xWrapper(SwsContext *c, const uint8_t *src8[],
int srcStride[], int srcSliceY,
int srcSliceH, uint8_t *dstParam8[],
@ -2206,6 +2248,9 @@ void ff_get_unscaled_swscale(SwsContext *c)
c->convert_unscaled = yuyvToYuv422Wrapper;
if (srcFormat == AV_PIX_FMT_UYVY422 && dstFormat == AV_PIX_FMT_YUV422P)
c->convert_unscaled = uyvyToYuv422Wrapper;
if (dstFormat == AV_PIX_FMT_YUV420P &&
(srcFormat == AV_PIX_FMT_NV24 || srcFormat == AV_PIX_FMT_NV42))
c->convert_unscaled = nv24ToYuv420Wrapper;
#define isPlanarGray(x) (isGray(x) && (x) != AV_PIX_FMT_YA8 && (x) != AV_PIX_FMT_YA16LE && (x) != AV_PIX_FMT_YA16BE)
/* simple copy */