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calculate probs consistently

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There were several different methods for calculating bitstream
probabilities in use. Consolodate these into a pair of functions,
get_prob() and get_binary_prob().

Change-Id: I5534f517f74027fee16d89c9baefaafea8156b2f
This commit is contained in:
John Koleszar 2012-10-18 16:27:30 -07:00
parent 6e364a57c0
commit 91dc8ce70d
1 changed files with 26 additions and 80 deletions
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106
vp8/encoder/bitstream.c
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@ -238,7 +238,7 @@ static void update_mbintra_mode_probs(VP8_COMP* const cpi,
}
}
static __inline int get_prob(int num, int den) {
static int get_prob(int num, int den) {
int p;
if (den <= 0)
return 128;
@ -250,26 +250,18 @@ static __inline int get_prob(int num, int den) {
return p;
}
static int get_binary_prob(int n0, int n1) {
return get_prob(n0, n0 + n1);
}
void update_skip_probs(VP8_COMP *cpi) {
VP8_COMMON *const pc = &cpi->common;
int prob_skip_false[3] = {0, 0, 0};
int k;
for (k = 0; k < MBSKIP_CONTEXTS; ++k) {
if ((cpi->skip_false_count[k] + cpi->skip_true_count[k])) {
prob_skip_false[k] =
cpi->skip_false_count[k] * 256 /
(cpi->skip_false_count[k] + cpi->skip_true_count[k]);
if (prob_skip_false[k] <= 1)
prob_skip_false[k] = 1;
if (prob_skip_false[k] > 255)
prob_skip_false[k] = 255;
} else
prob_skip_false[k] = 128;
pc->mbskip_pred_probs[k] = prob_skip_false[k];
pc->mbskip_pred_probs[k] = get_binary_prob(cpi->skip_false_count[k],
cpi->skip_true_count[k]);
}
}
@ -345,15 +337,8 @@ static void update_refpred_stats(VP8_COMP *cpi) {
} else {
// From the prediction counts set the probabilities for each context
for (i = 0; i < PREDICTION_PROBS; i++) {
tot_count = cpi->ref_pred_count[i][0] + cpi->ref_pred_count[i][1];
if (tot_count) {
new_pred_probs[i] =
(cpi->ref_pred_count[i][0] * 255 + (tot_count >> 1)) / tot_count;
// Clamp to minimum allowed value
new_pred_probs[i] += !new_pred_probs[i];
} else
new_pred_probs[i] = 128;
new_pred_probs[i] = get_binary_prob(cpi->ref_pred_count[i][0],
cpi->ref_pred_count[i][1]);
// Decide whether or not to update the reference frame probs.
// Returned costs are in 1/256 bit units.
@ -824,23 +809,9 @@ static void update_ref_probs(VP8_COMP *const cpi) {
const int rf_inter = rfct[LAST_FRAME] +
rfct[GOLDEN_FRAME] + rfct[ALTREF_FRAME];
cm->prob_intra_coded = (rf_intra + rf_inter)
? rf_intra * 255 / (rf_intra + rf_inter) : 1;
if (!cm->prob_intra_coded)
cm->prob_intra_coded = 1;
cm->prob_last_coded = rf_inter ? (rfct[LAST_FRAME] * 255) / rf_inter : 128;
if (!cm->prob_last_coded)
cm->prob_last_coded = 1;
cm->prob_gf_coded = (rfct[GOLDEN_FRAME] + rfct[ALTREF_FRAME])
? (rfct[GOLDEN_FRAME] * 255) /
(rfct[GOLDEN_FRAME] + rfct[ALTREF_FRAME]) : 128;
if (!cm->prob_gf_coded)
cm->prob_gf_coded = 1;
cm->prob_intra_coded = get_binary_prob(rf_intra, rf_inter);
cm->prob_last_coded = get_prob(rfct[LAST_FRAME], rf_inter);
cm->prob_gf_coded = get_binary_prob(rfct[GOLDEN_FRAME], rfct[ALTREF_FRAME]);
// Compute a modified set of probabilities to use when prediction of the
// reference frame fails
@ -2588,12 +2559,9 @@ void vp8_pack_bitstream(VP8_COMP *cpi, unsigned char *dest, unsigned long *size)
#if CONFIG_SUPERBLOCKS
{
/* sb mode probability */
int sb_coded = 256 - (cpi->sb_count << 8) / (((pc->mb_rows + 1) >> 1) * ((pc->mb_cols + 1) >> 1));
if (sb_coded <= 0)
sb_coded = 1;
else if (sb_coded >= 256)
sb_coded = 255;
pc->sb_coded = sb_coded;
const int sb_max = (((pc->mb_rows + 1) >> 1) * ((pc->mb_cols + 1) >> 1));
pc->sb_coded = get_prob(cpi->sb_count, sb_max);
vp8_write_literal(&header_bc, pc->sb_coded, 8);
}
#endif
@ -2847,15 +2815,8 @@ void vp8_pack_bitstream(VP8_COMP *cpi, unsigned char *dest, unsigned long *size)
vp8_write(&header_bc, use_hybrid_pred, 128);
if (use_hybrid_pred) {
for (i = 0; i < COMP_PRED_CONTEXTS; i++) {
if (cpi->single_pred_count[i] + cpi->comp_pred_count[i]) {
pc->prob_comppred[i] = cpi->single_pred_count[i] * 255 /
(cpi->single_pred_count[i]
+ cpi->comp_pred_count[i]);
if (pc->prob_comppred[i] < 1)
pc->prob_comppred[i] = 1;
} else {
pc->prob_comppred[i] = 128;
}
pc->prob_comppred[i] = get_binary_prob(cpi->single_pred_count[i],
cpi->comp_pred_count[i]);
vp8_write_literal(&header_bc, pc->prob_comppred[i], 8);
}
}
@ -2928,14 +2889,9 @@ void print_tree_update_probs() {
for (k = 0; k < PREV_COEF_CONTEXTS; k++) {
fprintf(f, " {");
for (l = 0; l < ENTROPY_NODES; l++) {
Sum = tree_update_hist[i][j][k][l][0] + tree_update_hist[i][j][k][l][1];
if (Sum > 0) {
if (((tree_update_hist[i][j][k][l][0] * 255) / Sum) > 0)
fprintf(f, "%3ld, ", (tree_update_hist[i][j][k][l][0] * 255) / Sum);
else
fprintf(f, "%3ld, ", 1);
} else
fprintf(f, "%3ld, ", 128);
fprintf(f, "%3ld, ",
get_binary_prob(tree_update_hist[i][j][k][l][0],
tree_update_hist[i][j][k][l][1]));
}
fprintf(f, "},\n");
}
@ -2957,14 +2913,9 @@ void print_tree_update_probs() {
for (k = 0; k < PREV_COEF_CONTEXTS; k++) {
fprintf(f, " {");
for (l = 0; l < MAX_ENTROPY_TOKENS - 1; l++) {
Sum = tree_update_hist_8x8[i][j][k][l][0] + tree_update_hist_8x8[i][j][k][l][1];
if (Sum > 0) {
if (((tree_update_hist_8x8[i][j][k][l][0] * 255) / Sum) > 0)
fprintf(f, "%3ld, ", (tree_update_hist_8x8[i][j][k][l][0] * 255) / Sum);
else
fprintf(f, "%3ld, ", 1);
} else
fprintf(f, "%3ld, ", 128);
fprintf(f, "%3ld, ",
get_binary_prob(tree_update_hist_8x8[i][j][k][l][0],
tree_update_hist_8x8[i][j][k][l][1]));
}
fprintf(f, "},\n");
}
@ -2985,14 +2936,9 @@ void print_tree_update_probs() {
for (k = 0; k < PREV_COEF_CONTEXTS; k++) {
fprintf(f, " {");
for (l = 0; l < MAX_ENTROPY_TOKENS - 1; l++) {
Sum = tree_update_hist_16x16[i][j][k][l][0] + tree_update_hist_16x16[i][j][k][l][1];
if (Sum > 0) {
if (((tree_update_hist_16x16[i][j][k][l][0] * 255) / Sum) > 0)
fprintf(f, "%3ld, ", (tree_update_hist_16x16[i][j][k][l][0] * 255) / Sum);
else
fprintf(f, "%3ld, ", 1);
} else
fprintf(f, "%3ld, ", 128);
fprintf(f, "%3ld, ",
get_binary_prob(tree_update_hist_16x16[i][j][k][l][0],
tree_update_hist_16x16[i][j][k][l][1]));
}
fprintf(f, "},\n");
}