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authorMichael Niedermayer <michaelni@gmx.at>2005-05-17 11:31:57 +0000
committerMichael Niedermayer <michaelni@gmx.at>2005-05-17 11:31:57 +0000
commit36af0c959e42a9427b2537682746d7f45802f579 (patch)
tree7531c89d513cb21eba22616d82ddcc4ebf70b685 /libavcodec/vp3.c
parent8b6103da0f0f2ac73cf2698e8f26d7b989a564ac (diff)
downloadffmpeg-36af0c959e42a9427b2537682746d7f45802f579.tar.gz
fix idct permutation
Originally committed as revision 4258 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vp3.c')
-rw-r--r--libavcodec/vp3.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index da4f531d29..5423da1eed 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -250,6 +250,8 @@ typedef struct Vp3DecodeContext {
int u_fragment_start;
int v_fragment_start;
+ ScanTable scantable;
+
/* tables */
uint16_t coded_dc_scale_factor[64];
uint32_t coded_ac_scale_factor[64];
@@ -885,20 +887,21 @@ static void init_dequantizer(Vp3DecodeContext *s)
/* scale AC quantizers, zigzag at the same time in preparation for
* the dequantization phase */
for (i = 1; i < 64; i++) {
+ int k= s->scantable.scantable[i];
+ j = s->scantable.permutated[i];
+
- j = i;
-
- s->intra_y_dequant[j] = s->coded_intra_y_dequant[i] * ac_scale_factor / 100;
+ s->intra_y_dequant[j] = s->coded_intra_y_dequant[k] * ac_scale_factor / 100;
if (s->intra_y_dequant[j] < MIN_DEQUANT_VAL)
s->intra_y_dequant[j] = MIN_DEQUANT_VAL;
s->intra_y_dequant[j] *= SCALER;
- s->intra_c_dequant[j] = s->coded_intra_c_dequant[i] * ac_scale_factor / 100;
+ s->intra_c_dequant[j] = s->coded_intra_c_dequant[k] * ac_scale_factor / 100;
if (s->intra_c_dequant[j] < MIN_DEQUANT_VAL)
s->intra_c_dequant[j] = MIN_DEQUANT_VAL;
s->intra_c_dequant[j] *= SCALER;
- s->inter_dequant[j] = s->coded_inter_dequant[i] * ac_scale_factor / 100;
+ s->inter_dequant[j] = s->coded_inter_dequant[k] * ac_scale_factor / 100;
if (s->inter_dequant[j] < MIN_DEQUANT_VAL * 2)
s->inter_dequant[j] = MIN_DEQUANT_VAL * 2;
s->inter_dequant[j] *= SCALER;
@@ -1633,6 +1636,7 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
int zero_run;
DCTELEM coeff;
Vp3Fragment *fragment;
+ uint8_t *perm= s->scantable.permutated;
if ((first_fragment >= s->fragment_count) ||
(last_fragment >= s->fragment_count)) {
@@ -1659,7 +1663,7 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
if (!eob_run) {
fragment->coeff_count += zero_run;
if (fragment->coeff_count < 64)
- fragment->coeffs[dezigzag_index[fragment->coeff_count++]] = coeff;
+ fragment->coeffs[perm[fragment->coeff_count++]] = coeff;
debug_vlc(" fragment %d coeff = %d\n",
s->coded_fragment_list[i], fragment->coeffs[coeff_index]);
} else {
@@ -2510,6 +2514,8 @@ static int vp3_decode_init(AVCodecContext *avctx)
if(avctx->idct_algo==FF_IDCT_AUTO)
avctx->idct_algo=FF_IDCT_VP3;
dsputil_init(&s->dsp, avctx);
+
+ ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
/* initialize to an impossible value which will force a recalculation
* in the first frame decode */