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Code Issues Releases Activity

VAAPI: fix WMV3 decoding of videos with an odd number of macroblocks per line.

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Originally committed as revision 21012 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Gwenole Beauchesne 2010-01-04 09:23:24 +00:00
parent 5716aec3f9
commit 81774dd0c4
1 changed files with 13 additions and 14 deletions
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27
libavcodec/vaapi_vc1.c
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@ -117,17 +117,18 @@ static inline VAMvModeVC1 vc1_get_MVMODE2(VC1Context *v)
}
/** Pack FFmpeg bitplanes into a VABitPlaneBuffer element */
static inline uint8_t vc1_pack_bitplanes(const uint8_t *ff_bp[3], int x, int y, int stride)
static inline void vc1_pack_bitplanes(uint8_t *bitplane, int n, const uint8_t *ff_bp[3], int x, int y, int stride)
{
const int n = y * stride + x;
const int bitplane_index = n / 2;
const int ff_bp_index = y * stride + x;
uint8_t v = 0;
if (ff_bp[0])
v = ff_bp[0][n];
v = ff_bp[0][ff_bp_index];
if (ff_bp[1])
v |= ff_bp[1][n] << 1;
v |= ff_bp[1][ff_bp_index] << 1;
if (ff_bp[2])
v |= ff_bp[2][n] << 2;
return v;
v |= ff_bp[2][ff_bp_index] << 2;
bitplane[bitplane_index] = (bitplane[bitplane_index] << 4) | v;
}
static int vaapi_vc1_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
@ -280,18 +281,16 @@ static int vaapi_vc1_start_frame(AVCodecContext *avctx, av_unused const uint8_t
break;
}
bitplane = ff_vaapi_alloc_bitplane(vactx, s->mb_height * ((s->mb_width + 1) / 2));
bitplane = ff_vaapi_alloc_bitplane(vactx, (s->mb_width * s->mb_height + 1) / 2);
if (!bitplane)
return -1;
n = 0;
for (y = 0; y < s->mb_height; y++) {
for (x = 0; x < s->mb_width; x += 2) {
bitplane[n] = vc1_pack_bitplanes(ff_bp, x+1, y, s->mb_stride);
bitplane[n] |= (vc1_pack_bitplanes(ff_bp, x, y, s->mb_stride) << 4);
++n;
}
}
for (y = 0; y < s->mb_height; y++)
for (x = 0; x < s->mb_width; x++, n++)
vc1_pack_bitplanes(bitplane, n, ff_bp, x, y, s->mb_stride);
if (n & 1) /* move last nibble to the high order */
bitplane[n/2] <<= 4;
}
return 0;
}