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j2k[c/h] j2kdec.c: Implement 2 code block styles

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This commit is contained in:
Rukhsana Ruby
2011-05-23 23:56:20 +02:00
committed by Michael Niedermayer
parent cbe60f3451
commit 88e9397ef1
3 changed files with 33 additions and 15 deletions
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14
libavcodec/j2k.c
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@@ -105,17 +105,19 @@ static void tag_tree_zero(J2kTgtNode *t, int w, int h)
uint8_t ff_j2k_nbctxno_lut[256][4]; uint8_t ff_j2k_nbctxno_lut[256][4];
static int getnbctxno(int flag, int bandno) static int getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
{ {
int h, v, d; int h, v, d;
h = ((flag & J2K_T1_SIG_E) ? 1:0)+ h = ((flag & J2K_T1_SIG_E) ? 1:0)+
((flag & J2K_T1_SIG_W) ? 1:0); ((flag & J2K_T1_SIG_W) ? 1:0);
v = ((flag & J2K_T1_SIG_N) ? 1:0)+ v = ((flag & J2K_T1_SIG_N) ? 1:0);
((flag & J2K_T1_SIG_S) ? 1:0); if (!vert_causal_ctx_csty_symbol)
v = v + ((flag & J2K_T1_SIG_S) ? 1:0);
d = ((flag & J2K_T1_SIG_NE) ? 1:0)+ d = ((flag & J2K_T1_SIG_NE) ? 1:0)+
((flag & J2K_T1_SIG_NW) ? 1:0)+ ((flag & J2K_T1_SIG_NW) ? 1:0);
((flag & J2K_T1_SIG_SE) ? 1:0)+ if (!vert_causal_ctx_csty_symbol)
d = d + ((flag & J2K_T1_SIG_SE) ? 1:0)+
((flag & J2K_T1_SIG_SW) ? 1:0); ((flag & J2K_T1_SIG_SW) ? 1:0);
if (bandno < 3){ if (bandno < 3){
if (bandno == 1) if (bandno == 1)
@@ -171,7 +173,7 @@ void ff_j2k_init_tier1_luts(void)
int i, j; int i, j;
for (i = 0; i < 256; i++) for (i = 0; i < 256; i++)
for (j = 0; j < 4; j++) for (j = 0; j < 4; j++)
ff_j2k_nbctxno_lut[i][j] = getnbctxno(i, j); ff_j2k_nbctxno_lut[i][j] = getnbctxno(i, j, 0);
for (i = 0; i < 16; i++) for (i = 0; i < 16; i++)
for (j = 0; j < 16; j++) for (j = 0; j < 16; j++)
ff_j2k_sgnctxno_lut[i][j] = getsgnctxno(i + (j << 8), &ff_j2k_xorbit_lut[i][j]); ff_j2k_sgnctxno_lut[i][j] = getsgnctxno(i + (j << 8), &ff_j2k_xorbit_lut[i][j]);

2
libavcodec/j2k.h
View File

@@ -208,7 +208,7 @@ void ff_j2k_set_significant(J2kT1Context *t1, int x, int y, int negative);
extern uint8_t ff_j2k_nbctxno_lut[256][4]; extern uint8_t ff_j2k_nbctxno_lut[256][4];
static inline int ff_j2k_getnbctxno(int flag, int bandno) static inline int ff_j2k_getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
{ {
return ff_j2k_nbctxno_lut[flag&255][bandno]; return ff_j2k_nbctxno_lut[flag&255][bandno];
} }

30
libavcodec/j2kdec.c
View File

@@ -592,7 +592,8 @@ static int decode_packets(J2kDecoderContext *s, J2kTile *tile)
} }
/* TIER-1 routines */ /* TIER-1 routines */
static void decode_sigpass(J2kT1Context *t1, int width, int height, int bpno, int bandno) static void decode_sigpass(J2kT1Context *t1, int width, int height, int bpno, int bandno, int bpass_csty_symbol,
int vert_causal_ctx_csty_symbol)
{ {
int mask = 3 << (bpno - 1), y0, x, y; int mask = 3 << (bpno - 1), y0, x, y;
@@ -601,10 +602,15 @@ static void decode_sigpass(J2kT1Context *t1, int width, int height, int bpno, in
for (y = y0; y < height && y < y0+4; y++){ for (y = y0; y < height && y < y0+4; y++){
if ((t1->flags[y+1][x+1] & J2K_T1_SIG_NB) if ((t1->flags[y+1][x+1] & J2K_T1_SIG_NB)
&& !(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS))){ && !(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS))){
if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno))){ 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 xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit); int xorbit, ctxno = ff_j2k_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) ^ xorbit) ? -mask : mask; t1->data[y][x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask;
else
t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ?
-mask : mask;
ff_j2k_set_significant(t1, x, y, t1->data[y][x] < 0); ff_j2k_set_significant(t1, x, y, t1->data[y][x] < 0);
} }
@@ -658,7 +664,8 @@ static void decode_clnpass(J2kDecoderContext *s, J2kT1Context *t1, int width, in
for (y = y0 + runlen; y < y0 + 4 && y < height; y++){ for (y = y0 + runlen; y < y0 + 4 && y < height; y++){
if (!dec){ if (!dec){
if (!(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS))) if (!(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS)))
dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno)); dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1],
bandno, 0));
} }
if (dec){ if (dec){
int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit); int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
@@ -685,7 +692,7 @@ static void decode_clnpass(J2kDecoderContext *s, J2kT1Context *t1, int width, in
static int decode_cblk(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kT1Context *t1, J2kCblk *cblk, static int decode_cblk(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kT1Context *t1, J2kCblk *cblk,
int width, int height, int bandpos) int width, int height, int bandpos)
{ {
int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y; int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y, clnpass_cnt = 0;
for (y = 0; y < height+2; y++) for (y = 0; y < height+2; y++)
memset(t1->flags[y], 0, (width+2)*sizeof(int)); memset(t1->flags[y], 0, (width+2)*sizeof(int));
@@ -697,14 +704,23 @@ static int decode_cblk(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kT1Contex
cblk->data[cblk->length] = 0xff; cblk->data[cblk->length] = 0xff;
cblk->data[cblk->length+1] = 0xff; cblk->data[cblk->length+1] = 0xff;
int bpass_csty_symbol = J2K_CBLK_BYPASS & codsty->cblk_style;
int vert_causal_ctx_csty_symbol = J2K_CBLK_VSC & codsty->cblk_style;
while(passno--){ while(passno--){
switch(pass_t){ switch(pass_t){
case 0: decode_sigpass(t1, width, height, bpno+1, bandpos); case 0: decode_sigpass(t1, width, height, bpno+1, bandpos,
bpass_csty_symbol && (clnpass_cnt >= 4), vert_causal_ctx_csty_symbol);
break; break;
case 1: decode_refpass(t1, width, height, bpno+1); case 1: decode_refpass(t1, width, height, bpno+1);
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);
break; break;
case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos, case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos,
codsty->cblk_style & J2K_CBLK_SEGSYM); codsty->cblk_style & J2K_CBLK_SEGSYM);
clnpass_cnt = clnpass_cnt + 1;
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);
break; break;
} }