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smpte: fix stride handling

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This commit is contained in:
Wim Taymans 2012-03-12 14:48:47 +01:00
parent 3f4e4edaa2
commit 15d1d40662
1 changed files with 30 additions and 11 deletions
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41
gst/smpte/gstsmpte.c
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@ -408,8 +408,7 @@ gst_smpte_blend_i420 (guint8 * in1, guint8 * in2, guint8 * out, GstMask * mask,
gint i, j; gint i, j;
gint min, max; gint min, max;
guint8 *in1u, *in1v, *in2u, *in2v, *outu, *outv; guint8 *in1u, *in1v, *in2u, *in2v, *outu, *outv;
gint lumsize = width * height; gint uoffset, voffset, ystr, ustr, vstr;
gint chromsize = lumsize >> 2;
if (border == 0) if (border == 0)
border++; border++;
@ -417,12 +416,19 @@ gst_smpte_blend_i420 (guint8 * in1, guint8 * in2, guint8 * out, GstMask * mask,
min = pos - border; min = pos - border;
max = pos; max = pos;
in1u = in1 + lumsize; uoffset = I420_U_OFFSET (width, height);
in1v = in1u + chromsize; voffset = I420_V_OFFSET (width, height);
in2u = in2 + lumsize;
in2v = in2u + chromsize; ystr = I420_Y_ROWSTRIDE (width);
outu = out + lumsize; ustr = I420_U_ROWSTRIDE (width);
outv = outu + chromsize; vstr = I420_V_ROWSTRIDE (width);
in1u = in1 + uoffset;
in1v = in1 + voffset;
in2u = in2 + uoffset;
in2v = in2 + voffset;
outu = out + uoffset;
outv = out + voffset;
maskp = mask->data; maskp = mask->data;
@ -431,12 +437,25 @@ gst_smpte_blend_i420 (guint8 * in1, guint8 * in2, guint8 * out, GstMask * mask,
value = *maskp++; value = *maskp++;
value = ((CLAMP (value, min, max) - min) << 8) / border; value = ((CLAMP (value, min, max) - min) << 8) / border;
*out++ = ((*in1++ * value) + (*in2++ * (256 - value))) >> 8; out[j] = ((in1[j] * value) + (in2[j] * (256 - value))) >> 8;
if (!(i & 1) && !(j & 1)) { if (!(i & 1) && !(j & 1)) {
*outu++ = ((*in1u++ * value) + (*in2u++ * (256 - value))) >> 8; outu[j / 2] =
*outv++ = ((*in1v++ * value) + (*in2v++ * (256 - value))) >> 8; ((in1u[j / 2] * value) + (in2u[j / 2] * (256 - value))) >> 8;
outv[j / 2] =
((in1v[j / 2] * value) + (in2v[j / 2] * (256 - value))) >> 8;
} }
} }
out += ystr;
in1 += ystr;
in2 += ystr;
if (!(i & 1)) {
outu += ustr;
in1u += ustr;
in2u += ustr;
outv += vstr;
in1v += vstr;
in2v += vstr;
}
} }
} }