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break down the proba 4D-array into some handy structs

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Makes it easy to later add derived satellite fields...

Change-Id: I445767ea78cc788d11aec367479e74e485fdabe5
This commit is contained in:
Pascal Massimino 2013-09-13 02:03:11 -07:00
parent d134307b7f
commit 6a44550a8c
3 changed files with 26 additions and 24 deletions
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8
src/dec/tree.c
View File

@ -327,7 +327,7 @@ static const uint8_t kBModesProba[NUM_BMODES][NUM_BMODES][NUM_BMODES - 1] = {
void VP8ResetProba(VP8Proba* const proba) {
memset(proba->segments_, 255u, sizeof(proba->segments_));
memcpy(proba->coeffs_, CoeffsProba0, sizeof(CoeffsProba0));
// proba->bands_[][] is initialized later
#ifndef ONLY_KEYFRAME_CODE
memcpy(proba->mv_, kMVProba0, sizeof(kMVProba0));
memcpy(proba->ymode_, kYModeProbaInter0, sizeof(kYModeProbaInter0));
@ -547,9 +547,9 @@ void VP8ParseProba(VP8BitReader* const br, VP8Decoder* const dec) {
for (b = 0; b < NUM_BANDS; ++b) {
for (c = 0; c < NUM_CTX; ++c) {
for (p = 0; p < NUM_PROBAS; ++p) {
if (VP8GetBit(br, CoeffsUpdateProba[t][b][c][p])) {
proba->coeffs_[t][b][c][p] = VP8GetValue(br, 8);
}
const int v = VP8GetBit(br, CoeffsUpdateProba[t][b][c][p]) ?
VP8GetValue(br, 8) : CoeffsProba0[t][b][c][p];
proba->bands_[t][b].probas_[c][p] = v;
}
}
}

32
src/dec/vp8.c
View File

@ -439,9 +439,6 @@ static const uint8_t kZigzag[16] = {
0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15
};
typedef const uint8_t (*ProbaArray)[NUM_CTX][NUM_PROBAS]; // for const-casting
typedef const uint8_t (*ProbaCtxArray)[NUM_PROBAS];
// See section 13-2: http://tools.ietf.org/html/rfc6386#section-13.2
static int GetLargeValue(VP8BitReader* const br, const uint8_t* const p) {
int v;
@ -476,15 +473,15 @@ static int GetLargeValue(VP8BitReader* const br, const uint8_t* const p) {
// Returns the position of the last non-zero coeff plus one
// (and 0 if there's no coeff at all)
static int GetCoeffs(VP8BitReader* const br, ProbaArray prob,
static int GetCoeffs(VP8BitReader* const br, const VP8BandProbas* const prob,
int ctx, const quant_t dq, int n, int16_t* out) {
// n is either 0 or 1 here. kBands[n] is not necessary for extracting '*p'.
const uint8_t* p = prob[n][ctx];
const uint8_t* p = prob[n].probas_[ctx];
if (!VP8GetBit(br, p[0])) { // first EOB is more a 'CBP' bit.
return 0;
}
for (; n < 16; ++n) {
const ProbaCtxArray p_ctx = prob[kBands[n + 1]];
const VP8ProbaArray *p_ctx = &prob[kBands[n + 1]].probas_[0];
if (!VP8GetBit(br, p[1])) {
p = p_ctx[0];
} else { // non zero coeff
@ -507,9 +504,8 @@ static int GetCoeffs(VP8BitReader* const br, ProbaArray prob,
static int ParseResiduals(VP8Decoder* const dec,
VP8MB* const mb, VP8BitReader* const token_br) {
uint32_t out_t_nz, out_l_nz;
int first;
ProbaArray ac_prob;
VP8BandProbas (* const bands)[NUM_BANDS] = dec->proba_.bands_;
const VP8BandProbas* ac_proba;
const VP8QuantMatrix* const q = &dec->dqm_[dec->segment_];
VP8MBData* const block = dec->mb_data_;
int16_t* dst = block->coeffs_;
@ -518,20 +514,21 @@ static int ParseResiduals(VP8Decoder* const dec,
uint32_t non_zero_ac = 0;
uint32_t non_zero_dc = 0;
int x, y, ch;
uint32_t out_t_nz, out_l_nz;
int first;
memset(dst, 0, 384 * sizeof(*dst));
if (!block->is_i4x4_) { // parse DC
int16_t dc[16] = { 0 };
const int ctx = mb->nz_dc_ + left_mb->nz_dc_;
mb->nz_dc_ = left_mb->nz_dc_ =
(GetCoeffs(token_br, (ProbaArray)dec->proba_.coeffs_[1],
ctx, q->y2_mat_, 0, dc) > 0);
first = 1;
ac_prob = (ProbaArray)dec->proba_.coeffs_[0];
(GetCoeffs(token_br, bands[1], ctx, q->y2_mat_, 0, dc) > 0);
VP8TransformWHT(dc, dst);
first = 1;
ac_proba = bands[0];
} else {
first = 0;
ac_prob = (ProbaArray)dec->proba_.coeffs_[3];
ac_proba = bands[3];
}
tnz = mb->nz_ & 0x0f;
@ -541,8 +538,7 @@ static int ParseResiduals(VP8Decoder* const dec,
uint32_t nz_dc = 0, nz_ac = 0;
for (x = 0; x < 4; ++x) {
const int ctx = l + (tnz & 1);
const int nz = GetCoeffs(token_br, ac_prob, ctx,
q->y1_mat_, first, dst);
const int nz = GetCoeffs(token_br, ac_proba, ctx, q->y1_mat_, first, dst);
l = (nz > 0);
tnz = (tnz >> 1) | (l << 7);
nz_dc = (nz_dc << 1) | (dst[0] != 0);
@ -565,9 +561,7 @@ static int ParseResiduals(VP8Decoder* const dec,
int l = lnz & 1;
for (x = 0; x < 2; ++x) {
const int ctx = l + (tnz & 1);
const int nz =
GetCoeffs(token_br, (ProbaArray)dec->proba_.coeffs_[2],
ctx, q->uv_mat_, 0, dst);
const int nz = GetCoeffs(token_br, bands[2], ctx, q->uv_mat_, 0, dst);
l = (nz > 0);
tnz = (tnz >> 1) | (l << 3);
nz_dc = (nz_dc << 1) | (dst[0] != 0);

10
src/dec/vp8i.h
View File

@ -128,11 +128,19 @@ typedef struct {
int8_t filter_strength_[NUM_MB_SEGMENTS]; // filter strength for segments
} VP8SegmentHeader;
// probas associated to one of the contexts
typedef uint8_t VP8ProbaArray[NUM_PROBAS];
typedef struct { // all the probas associated to one band
VP8ProbaArray probas_[NUM_CTX];
} VP8BandProbas;
// Struct collecting all frame-persistent probabilities.
typedef struct {
uint8_t segments_[MB_FEATURE_TREE_PROBS];
// Type: 0:Intra16-AC 1:Intra16-DC 2:Chroma 3:Intra4
uint8_t coeffs_[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS];
VP8BandProbas bands_[NUM_TYPES][NUM_BANDS];
#ifndef ONLY_KEYFRAME_CODE
uint8_t ymode_[4], uvmode_[3];
uint8_t mv_[2][NUM_MV_PROBAS];