virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity

avcodec/jpeg2000dec: Fix Vertically causal context formation

Browse Source 
Fixes Ticket4626

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-15 18:00:19 +02:00
parent 021351f246
commit 96bbbebaf9
1 changed files with 18 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
libavcodec/jpeg2000dec.c
View File

@ -1231,13 +1231,13 @@ static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,
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_NB)
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 | JPEG2000_T1_SGN_S);
if ((t1->flags[y+1][x+1] & JPEG2000_T1_SIG_NB & flags_mask)
&& !(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);
if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_jpeg2000_getsigctxno(t1->flags[y+1][x+1] & flags_mask, bandno))) {
int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y+1][x+1] & flags_mask, &xorbit);
if (t1->mqc.raw)
t1->data[y][x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask;
else
@ -1253,7 +1253,7 @@ static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,
}
static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
int bpno)
int bpno, int vert_causal_ctx_csty_symbol)
{
int phalf, nhalf;
int y0, x, y;
@ -1265,7 +1265,9 @@ static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
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 | JPEG2000_T1_VIS)) == JPEG2000_T1_SIG) {
int ctxno = ff_jpeg2000_getrefctxno(t1->flags[y + 1][x + 1]);
int flags_mask = (vert_causal_ctx_csty_symbol && y == y0 + 3) ?
~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE | JPEG2000_T1_SGN_S) : -1;
int ctxno = ff_jpeg2000_getrefctxno(t1->flags[y + 1][x + 1] & flags_mask);
int r = ff_mqc_decode(&t1->mqc,
t1->mqc.cx_states + ctxno)
? phalf : nhalf;
@ -1282,11 +1284,14 @@ static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
for (y0 = 0; y0 < height; y0 += 4) {
for (x = 0; x < width; x++) {
int flags_mask = -1;
if (vert_causal_ctx_csty_symbol)
flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE | JPEG2000_T1_SGN_S);
if (y0 + 3 < height &&
!((t1->flags[y0 + 1][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
(t1->flags[y0 + 2][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
(t1->flags[y0 + 3][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
(t1->flags[y0 + 4][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)))) {
(t1->flags[y0 + 4][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG) & flags_mask))) {
if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL))
continue;
runlen = ff_mqc_decode(&t1->mqc,
@ -1301,18 +1306,18 @@ static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
}
for (y = y0 + runlen; y < y0 + 4 && y < height; y++) {
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 | JPEG2000_T1_SGN_S);
if (!dec) {
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_jpeg2000_getsigctxno(t1->flags[y+1][x+1] & flags_mask,
bandno));
}
}
if (dec) {
int xorbit;
int ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
int ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1] & flags_mask,
&xorbit);
t1->data[y][x] = (ff_mqc_decode(&t1->mqc,
t1->mqc.cx_states + ctxno) ^
@ -1371,7 +1376,7 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
vert_causal_ctx_csty_symbol);
break;
case 1:
decode_refpass(t1, width, height, bpno + 1);
decode_refpass(t1, width, height, bpno + 1, vert_causal_ctx_csty_symbol);
break;
case 2:
av_assert2(!t1->mqc.raw);