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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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28
gst-libs/gst/codecparsers/gstvc1parser.c
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@ -485,7 +485,7 @@ bitplane_decoding (GstBitReader * br, guint8 * data,
GST_DEBUG ("Parsing IMODE_DIFF6 or IMODE_NORM6 biplane");
if (!(height % 3) && (width % 3)) { /* decode 2x3 "vertical" tiles */
if (!(height % 3) && (width % 3)) { /* decode 2x3 "vertical" tiles */
for (y = 0; y < height; y += 3) {
for (x = width & 1; x < width; x += 2) {
if (!decode_vlc (br, &v, vc1_norm6_vlc_table,
@ -508,7 +508,7 @@ bitplane_decoding (GstBitReader * br, guint8 * data,
x = width & 1;
y = 0;
} else { /* decode 3x2 "horizontal" tiles */
} else { /* decode 3x2 "horizontal" tiles */
if (pdata)
pdata += (height & 1) * width;
@ -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: