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j2k: redesign vert_causal_ctx_csty implementation 

The old implementation was incomplete and could not have worked
This also fixes some warnings
New code is untested as i dont seem to have a sample file that uses this.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-26 16:33:59 +02:00
parent c8e9c9275f
commit 5157ec89ef
4 changed files with 22 additions and 21 deletions
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12
libavcodec/j2k.c
View File

@ -103,20 +103,18 @@ static void tag_tree_zero(Jpeg2000TgtNode *t, int w, int h)
}
}
static int getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
static int getnbctxno(int flag, int bandno)
{
int h, v, d;
h = ((flag & JPEG2000_T1_SIG_E) ? 1:0)+
((flag & JPEG2000_T1_SIG_W) ? 1:0);
v = ((flag & JPEG2000_T1_SIG_N) ? 1:0);
if (!vert_causal_ctx_csty_symbol)
v = v + ((flag & JPEG2000_T1_SIG_S) ? 1:0);
v = v + ((flag & JPEG2000_T1_SIG_S) ? 1:0);
d = ((flag & JPEG2000_T1_SIG_NE) ? 1:0)+
((flag & JPEG2000_T1_SIG_NW) ? 1:0);
if (!vert_causal_ctx_csty_symbol)
d = d + ((flag & JPEG2000_T1_SIG_SE) ? 1:0)+
((flag & JPEG2000_T1_SIG_SW) ? 1:0);
d = d + ((flag & JPEG2000_T1_SIG_SE) ? 1:0)+
((flag & JPEG2000_T1_SIG_SW) ? 1:0);
if (bandno < 3){
if (bandno == 1)
FFSWAP(int, h, v);
@ -168,7 +166,7 @@ void ff_j2k_init_tier1_luts(void)
int i, j;
for (i = 0; i < 256; i++)
for (j = 0; j < 4; j++)
ff_jpeg2000_sigctxno_lut[i][j] = getnbctxno(i, j, 0);
ff_jpeg2000_sigctxno_lut[i][j] = getnbctxno(i, j);
for (i = 0; i < 16; i++)
for (j = 0; j < 16; j++)
ff_jpeg2000_sgnctxno_lut[i][j] = getsgnctxno(i + (j << 8), &ff_jpeg2000_xorbit_lut[i][j]);

2
libavcodec/j2k.h
View File

@ -213,7 +213,7 @@ void ff_j2k_set_significant(Jpeg2000T1Context *t1, int x, int y, int negative);
extern uint8_t ff_jpeg2000_sigctxno_lut[256][4];
static inline int ff_j2k_getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
static inline int ff_j2k_getnbctxno(int flag, int bandno)
{
return ff_jpeg2000_sigctxno_lut[flag&255][bandno];
}

21
libavcodec/j2kdec.c
View File

@ -628,9 +628,10 @@ static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height, int bpn
for (y = y0; y < height && y < y0+4; y++){
if ((t1->flags[y+1][x+1] & JPEG2000_T1_SIG_NB)
&& !(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))){
int vert_causal_ctx_csty_loc_symbol = vert_causal_ctx_csty_symbol && (x == 3 && y == 3);
if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno,
vert_causal_ctx_csty_loc_symbol))){
int flags_mask = -1;
if (vert_causal_ctx_csty_symbol && y == y0 + 3)
flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE);
if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1] & flags_mask, bandno))){
int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
if (bpass_csty_symbol)
t1->data[y][x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask;
@ -666,7 +667,7 @@ static void decode_refpass(Jpeg2000T1Context *t1, int width, int height, int bpn
}
static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1, int width, int height,
int bpno, int bandno, int seg_symbols)
int bpno, int bandno, int seg_symbols, int vert_causal_ctx_csty_symbol)
{
int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
@ -689,9 +690,13 @@ static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1, int
for (y = y0 + runlen; y < y0 + 4 && y < height; y++){
if (!dec){
if (!(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)))
dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1],
bandno, 0));
if (!(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
int flags_mask = -1;
if (vert_causal_ctx_csty_symbol && y == y0 + 3)
flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE);
dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1] & flags_mask,
bandno));
}
}
if (dec){
int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
@ -742,7 +747,7 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty, J
ff_mqc_initdec(&t1->mqc, cblk->data);
break;
case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos,
codsty->cblk_style & JPEG2000_CBLK_SEGSYM);
codsty->cblk_style & JPEG2000_CBLK_SEGSYM, vert_causal_ctx_csty_symbol);
clnpass_cnt = clnpass_cnt + 1;
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);

8
libavcodec/j2kenc.c
View File

@ -476,12 +476,11 @@ static int getnmsedec_ref(int x, int bpno)
static void encode_sigpass(Jpeg2000T1Context *t1, int width, int height, int bandno, int *nmsedec, int bpno)
{
int y0, x, y, mask = 1 << (bpno + NMSEDEC_FRACBITS);
int vert_causal_ctx_csty_loc_symbol;
for (y0 = 0; y0 < height; y0 += 4)
for (x = 0; x < width; x++)
for (y = y0; y < height && y < y0+4; y++){
if (!(t1->flags[y+1][x+1] & JPEG2000_T1_SIG) && (t1->flags[y+1][x+1] & JPEG2000_T1_SIG_NB)){
int ctxno = ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno, vert_causal_ctx_csty_loc_symbol),
int ctxno = ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno),
bit = t1->data[y][x] & mask ? 1 : 0;
ff_mqc_encode(&t1->mqc, t1->mqc.cx_states + ctxno, bit);
if (bit){
@ -513,7 +512,6 @@ static void encode_refpass(Jpeg2000T1Context *t1, int width, int height, int *nm
static void encode_clnpass(Jpeg2000T1Context *t1, int width, int height, int bandno, int *nmsedec, int bpno)
{
int y0, x, y, mask = 1 << (bpno + NMSEDEC_FRACBITS);
int vert_causal_ctx_csty_loc_symbol;
for (y0 = 0; y0 < height; y0 += 4)
for (x = 0; x < width; x++){
if (y0 + 3 < height && !(
@ -534,7 +532,7 @@ static void encode_clnpass(Jpeg2000T1Context *t1, int width, int height, int ban
ff_mqc_encode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI, rlen & 1);
for (y = y0 + rlen; y < y0 + 4; y++){
if (!(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))){
int ctxno = ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno, vert_causal_ctx_csty_loc_symbol);
int ctxno = ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno);
if (y > y0 + rlen)
ff_mqc_encode(&t1->mqc, t1->mqc.cx_states + ctxno, t1->data[y][x] & mask ? 1:0);
if (t1->data[y][x] & mask){ // newly significant
@ -550,7 +548,7 @@ static void encode_clnpass(Jpeg2000T1Context *t1, int width, int height, int ban
} else{
for (y = y0; y < y0 + 4 && y < height; y++){
if (!(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))){
int ctxno = ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno, vert_causal_ctx_csty_loc_symbol);
int ctxno = ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno);
ff_mqc_encode(&t1->mqc, t1->mqc.cx_states + ctxno, t1->data[y][x] & mask ? 1:0);
if (t1->data[y][x] & mask){ // newly significant
int xorbit;