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Select scan tables for 8x4 and 4x8 blocks only once.

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Patch by Christophe GISQUET ([christophe][gisquet] <whirlpool sign> free <spot> fr)
Thread [PATCH] Determine once and for all zz scan tables to use in VC-1 VLD

Originally committed as revision 11525 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Christophe Gisquet 2008-01-14 06:10:02 +00:00 committed by Kostya Shishkov
parent 526e037b95
commit 750e37eb83
2 changed files with 12 additions and 12 deletions
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22
libavcodec/vc1.c
View File

@ -777,10 +777,14 @@ static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)
if (v->profile == PROFILE_ADVANCED)
{
v->zz_8x4 = ff_vc1_adv_progressive_8x4_zz;
v->zz_4x8 = ff_vc1_adv_progressive_4x8_zz;
return decode_sequence_header_adv(v, gb);
}
else
{
v->zz_8x4 = ff_vc1_simple_progressive_8x4_zz;
v->zz_4x8 = ff_vc1_simple_progressive_4x8_zz;
v->res_sm = get_bits(gb, 2); //reserved
if (v->res_sm)
{
@ -2961,13 +2965,10 @@ static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquan
i += skip;
if(i > 31)
break;
if(v->profile < PROFILE_ADVANCED)
idx = ff_vc1_simple_progressive_8x4_zz[i++];
else
idx = ff_vc1_adv_progressive_8x4_zz[i++];
block[idx + off] = value * scale;
idx = v->zz_8x4[i++]+off;
block[idx] = value * scale;
if(!v->pquantizer)
block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
block[idx] += (block[idx] < 0) ? -mquant : mquant;
}
if(!(subblkpat & (1 << (1 - j))) && !skip_block)
s->dsp.vc1_inv_trans_8x4(dst + j*4*linesize, linesize, block + off);
@ -2983,13 +2984,10 @@ static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquan
i += skip;
if(i > 31)
break;
if(v->profile < PROFILE_ADVANCED)
idx = ff_vc1_simple_progressive_4x8_zz[i++];
else
idx = ff_vc1_adv_progressive_4x8_zz[i++];
block[idx + off] = value * scale;
idx = v->zz_4x8[i++]+off;
block[idx] = value * scale;
if(!v->pquantizer)
block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
block[idx] += (block[idx] < 0) ? -mquant : mquant;
}
if(!(subblkpat & (1 << (1 - j))) && !skip_block)
s->dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

2
libavcodec/vc1.h
View File

@ -216,6 +216,8 @@ typedef struct VC1Context{
int k_y; ///< Number of bits for MVs (depends on MV range)
int range_x, range_y; ///< MV range
uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
const uint8_t* zz_8x4;///< Zigzag scan table for TT_8x4 coding mode
const uint8_t* zz_4x8;///< Zigzag scan table for TT_4x8 coding mode
/** pquant parameters */
//@{
uint8_t dquantfrm;