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Adding setup_pred_probs and read_txfm_mode functions.

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Decomposition vp9_decode_frame function, moving code into read_txfm_mode
and setup_pred_probs functions.

Change-Id: I90970dea43cbcef4d6d61fdef267c2094ddee65d
This commit is contained in:
Dmitry Kovalev
2013-04-03 12:18:15 -07:00
parent 7d67aed16c
commit 59b2928d40
1 changed files with 31 additions and 28 deletions
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59
vp9/decoder/vp9_decodframe.c
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@@ -58,6 +58,13 @@ static int read_is_valid(const unsigned char *start, size_t len,
return start + len > start && start + len <= end;
}
static TXFM_MODE read_txfm_mode(vp9_reader *r) {
TXFM_MODE mode = vp9_read_literal(r, 2);
if (mode == ALLOW_32X32)
mode += vp9_read_bit(r);
return mode;
}
static int merge_index(int v, int n, int modulus) {
int max1 = (n - 1 - modulus / 2) / modulus + 1;
if (v < max1) v = v * modulus + modulus / 2;
@@ -1349,9 +1356,23 @@ static void setup_segmentation(VP9_COMMON *pc, MACROBLOCKD *xd, vp9_reader *r) {
}
}
static void setup_loopfilter(VP9_COMMON *pc, MACROBLOCKD *xd, vp9_reader *r) {
int i;
static void setup_pred_probs(VP9_COMMON *pc, vp9_reader *r) {
// Read common prediction model status flag probability updates for the
// reference frame
if (pc->frame_type == KEY_FRAME) {
// Set the prediction probabilities to defaults
pc->ref_pred_probs[0] = 120;
pc->ref_pred_probs[1] = 80;
pc->ref_pred_probs[2] = 40;
} else {
int i;
for (i = 0; i < PREDICTION_PROBS; ++i)
if (vp9_read_bit(r))
pc->ref_pred_probs[i] = vp9_read_prob(r);
}
}
static void setup_loopfilter(VP9_COMMON *pc, MACROBLOCKD *xd, vp9_reader *r) {
pc->filter_type = (LOOPFILTERTYPE) vp9_read_bit(r);
pc->filter_level = vp9_read_literal(r, 6);
pc->sharpness_level = vp9_read_literal(r, 3);
@@ -1373,6 +1394,8 @@ static void setup_loopfilter(VP9_COMMON *pc, MACROBLOCKD *xd, vp9_reader *r) {
xd->mode_ref_lf_delta_update = vp9_read_bit(r);
if (xd->mode_ref_lf_delta_update) {
int i;
// Send update
for (i = 0; i < MAX_REF_LF_DELTAS; i++) {
if (vp9_read_bit(r)) {
@@ -1682,36 +1705,16 @@ int vp9_decode_frame(VP9D_COMP *pbi, const uint8_t **p_data_end) {
setup_segmentation(pc, xd, &header_bc);
// Read common prediction model status flag probability updates for the
// reference frame
if (pc->frame_type == KEY_FRAME) {
// Set the prediction probabilities to defaults
pc->ref_pred_probs[0] = 120;
pc->ref_pred_probs[1] = 80;
pc->ref_pred_probs[2] = 40;
} else {
for (i = 0; i < PREDICTION_PROBS; i++) {
if (vp9_read_bit(&header_bc))
pc->ref_pred_probs[i] = vp9_read_prob(&header_bc);
}
}
setup_pred_probs(pc, &header_bc);
pc->prob_sb64_coded = vp9_read_prob(&header_bc);
pc->prob_sb32_coded = vp9_read_prob(&header_bc);
xd->lossless = vp9_read_bit(&header_bc);
if (xd->lossless) {
pc->txfm_mode = ONLY_4X4;
} else {
// Read the loop filter level and type
pc->txfm_mode = vp9_read_literal(&header_bc, 2);
if (pc->txfm_mode == ALLOW_32X32)
pc->txfm_mode += vp9_read_bit(&header_bc);
if (pc->txfm_mode == TX_MODE_SELECT) {
pc->prob_tx[0] = vp9_read_prob(&header_bc);
pc->prob_tx[1] = vp9_read_prob(&header_bc);
pc->prob_tx[2] = vp9_read_prob(&header_bc);
}
pc->txfm_mode = xd->lossless ? ONLY_4X4 : read_txfm_mode(&header_bc);
if (pc->txfm_mode == TX_MODE_SELECT) {
pc->prob_tx[0] = vp9_read_prob(&header_bc);
pc->prob_tx[1] = vp9_read_prob(&header_bc);
pc->prob_tx[2] = vp9_read_prob(&header_bc);
}
setup_loopfilter(pc, xd, &header_bc);