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codecparsers: VC1: Implement bitplanes diff operator

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This commit is contained in:
Thibault Saunier 2011-10-04 17:39:42 -03:00
parent 8090627581
commit ce71fdae1b
1 changed files with 26 additions and 2 deletions
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24
gst-libs/gst/codecparsers/gstvc1parser.c
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@ -564,6 +564,30 @@ bitplane_decoding (GstBitReader * br, guint8 * data,
break;
}
if (!data)
return TRUE;
/* Applying diff operator */
if (imode == IMODE_DIFF2 || imode == IMODE_DIFF6) {
pdata = data;
pdata[0] ^= invert;
for (x = 1; x < width; x++)
pdata[x] ^= pdata[x - 1];
for (y = 1; y < height; y++) {
pdata[stride] ^= pdata[0];
for (x = 1; x < width; x++) {
if (pdata[stride + x - 1] != pdata[x])
pdata[stride + x] ^= invert;
else
pdata[stride + x] ^= pdata[stride + x - 1];
}
pdata += stride;
}
}
return TRUE;
failed: