diff options
author | Måns Rullgård <mans@mansr.com> | 2009-01-18 00:44:56 +0300 |
---|---|---|
committer | Måns Rullgård <mans@mansr.com> | 2009-01-18 00:44:56 +0300 |
commit | 16172207990ce98a0d397d94463825011a61809c (patch) | |
tree | fb1dc15f2cd25a8049278cb3b8091f2858f5c371 /libavcodec/alpha/mpegvideo_alpha.c | |
parent | 2323ac0154e6bd25809563c2effdb077c8919f72 (diff) |
Alpha: fix dct_unquantize_h263_inter/intra_axp()
Originally committed as revision 16660 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/alpha/mpegvideo_alpha.c')
-rw-r--r-- | libavcodec/alpha/mpegvideo_alpha.c | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/libavcodec/alpha/mpegvideo_alpha.c b/libavcodec/alpha/mpegvideo_alpha.c index 3c32af157d..4dd37690fd 100644 --- a/libavcodec/alpha/mpegvideo_alpha.c +++ b/libavcodec/alpha/mpegvideo_alpha.c @@ -30,25 +30,29 @@ static void dct_unquantize_h263_intra_axp(MpegEncContext *s, DCTELEM *block, uint64_t qmul, qadd; uint64_t correction; DCTELEM *orig_block = block; - DCTELEM block0; /* might not be used uninitialized */ + DCTELEM block0 = block[0]; - qadd = WORD_VEC((qscale - 1) | 1); qmul = qscale << 1; /* This mask kills spill from negative subwords to the next subword. */ - correction = WORD_VEC((qmul - 1) + 1); /* multiplication / addition */ + correction = WORD_VEC(qmul * 255 >> 8); if (!s->h263_aic) { if (n < 4) - block0 = block[0] * s->y_dc_scale; + block0 *= s->y_dc_scale; else - block0 = block[0] * s->c_dc_scale; + block0 *= s->c_dc_scale; + qadd = WORD_VEC((qscale - 1) | 1); } else { qadd = 0; } - n_coeffs = 63; // does not always use zigzag table + + if(s->ac_pred) + n_coeffs = 63; + else + n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; for(i = 0; i <= n_coeffs; block += 4, i += 4) { - uint64_t levels, negmask, zeros, add; + uint64_t levels, negmask, zeros, add, sub; levels = ldq(block); if (levels == 0) @@ -73,19 +77,17 @@ static void dct_unquantize_h263_intra_axp(MpegEncContext *s, DCTELEM *block, levels *= qmul; levels -= correction & (negmask << 16); - /* Negate qadd for negative levels. */ - add = qadd ^ negmask; - add += WORD_VEC(0x0001) & negmask; + add = qadd & ~negmask; + sub = qadd & negmask; /* Set qadd to 0 for levels == 0. */ add = zap(add, zeros); - levels += add; + levels -= sub; stq(levels, block); } - if (s->mb_intra && !s->h263_aic) - orig_block[0] = block0; + orig_block[0] = block0; } static void dct_unquantize_h263_inter_axp(MpegEncContext *s, DCTELEM *block, @@ -100,7 +102,7 @@ static void dct_unquantize_h263_inter_axp(MpegEncContext *s, DCTELEM *block, /* This mask kills spill from negative subwords to the next subword. */ correction = WORD_VEC((qmul - 1) + 1); /* multiplication / addition */ - n_coeffs = s->intra_scantable.raster_end[s->block_last_index[n]]; + n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; for(i = 0; i <= n_coeffs; block += 4, i += 4) { uint64_t levels, negmask, zeros, add; |